linux/drivers/net/ethernet/cisco/enic/enic_main.c
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   1/*
   2 * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
   3 * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   4 *
   5 * This program is free software; you may redistribute it and/or modify
   6 * it under the terms of the GNU General Public License as published by
   7 * the Free Software Foundation; version 2 of the License.
   8 *
   9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  16 * SOFTWARE.
  17 *
  18 */
  19
  20#include <linux/module.h>
  21#include <linux/kernel.h>
  22#include <linux/string.h>
  23#include <linux/errno.h>
  24#include <linux/types.h>
  25#include <linux/init.h>
  26#include <linux/interrupt.h>
  27#include <linux/workqueue.h>
  28#include <linux/pci.h>
  29#include <linux/netdevice.h>
  30#include <linux/etherdevice.h>
  31#include <linux/if.h>
  32#include <linux/if_ether.h>
  33#include <linux/if_vlan.h>
  34#include <linux/in.h>
  35#include <linux/ip.h>
  36#include <linux/ipv6.h>
  37#include <linux/tcp.h>
  38#include <linux/rtnetlink.h>
  39#include <linux/prefetch.h>
  40#include <net/ip6_checksum.h>
  41#include <linux/ktime.h>
  42#include <linux/numa.h>
  43#ifdef CONFIG_RFS_ACCEL
  44#include <linux/cpu_rmap.h>
  45#endif
  46#include <linux/crash_dump.h>
  47#include <net/busy_poll.h>
  48#include <net/vxlan.h>
  49
  50#include "cq_enet_desc.h"
  51#include "vnic_dev.h"
  52#include "vnic_intr.h"
  53#include "vnic_stats.h"
  54#include "vnic_vic.h"
  55#include "enic_res.h"
  56#include "enic.h"
  57#include "enic_dev.h"
  58#include "enic_pp.h"
  59#include "enic_clsf.h"
  60
  61#define ENIC_NOTIFY_TIMER_PERIOD        (2 * HZ)
  62#define WQ_ENET_MAX_DESC_LEN            (1 << WQ_ENET_LEN_BITS)
  63#define MAX_TSO                         (1 << 16)
  64#define ENIC_DESC_MAX_SPLITS            (MAX_TSO / WQ_ENET_MAX_DESC_LEN + 1)
  65
  66#define PCI_DEVICE_ID_CISCO_VIC_ENET         0x0043  /* ethernet vnic */
  67#define PCI_DEVICE_ID_CISCO_VIC_ENET_DYN     0x0044  /* enet dynamic vnic */
  68#define PCI_DEVICE_ID_CISCO_VIC_ENET_VF      0x0071  /* enet SRIOV VF */
  69
  70#define RX_COPYBREAK_DEFAULT            256
  71
  72/* Supported devices */
  73static const struct pci_device_id enic_id_table[] = {
  74        { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET) },
  75        { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET_DYN) },
  76        { PCI_VDEVICE(CISCO, PCI_DEVICE_ID_CISCO_VIC_ENET_VF) },
  77        { 0, }  /* end of table */
  78};
  79
  80MODULE_DESCRIPTION(DRV_DESCRIPTION);
  81MODULE_AUTHOR("Scott Feldman <scofeldm@cisco.com>");
  82MODULE_LICENSE("GPL");
  83MODULE_VERSION(DRV_VERSION);
  84MODULE_DEVICE_TABLE(pci, enic_id_table);
  85
  86#define ENIC_LARGE_PKT_THRESHOLD                1000
  87#define ENIC_MAX_COALESCE_TIMERS                10
  88/*  Interrupt moderation table, which will be used to decide the
  89 *  coalescing timer values
  90 *  {rx_rate in Mbps, mapping percentage of the range}
  91 */
  92static struct enic_intr_mod_table mod_table[ENIC_MAX_COALESCE_TIMERS + 1] = {
  93        {4000,  0},
  94        {4400, 10},
  95        {5060, 20},
  96        {5230, 30},
  97        {5540, 40},
  98        {5820, 50},
  99        {6120, 60},
 100        {6435, 70},
 101        {6745, 80},
 102        {7000, 90},
 103        {0xFFFFFFFF, 100}
 104};
 105
 106/* This table helps the driver to pick different ranges for rx coalescing
 107 * timer depending on the link speed.
 108 */
 109static struct enic_intr_mod_range mod_range[ENIC_MAX_LINK_SPEEDS] = {
 110        {0,  0}, /* 0  - 4  Gbps */
 111        {0,  3}, /* 4  - 10 Gbps */
 112        {3,  6}, /* 10 - 40 Gbps */
 113};
 114
 115static void enic_init_affinity_hint(struct enic *enic)
 116{
 117        int numa_node = dev_to_node(&enic->pdev->dev);
 118        int i;
 119
 120        for (i = 0; i < enic->intr_count; i++) {
 121                if (enic_is_err_intr(enic, i) || enic_is_notify_intr(enic, i) ||
 122                    (cpumask_available(enic->msix[i].affinity_mask) &&
 123                     !cpumask_empty(enic->msix[i].affinity_mask)))
 124                        continue;
 125                if (zalloc_cpumask_var(&enic->msix[i].affinity_mask,
 126                                       GFP_KERNEL))
 127                        cpumask_set_cpu(cpumask_local_spread(i, numa_node),
 128                                        enic->msix[i].affinity_mask);
 129        }
 130}
 131
 132static void enic_free_affinity_hint(struct enic *enic)
 133{
 134        int i;
 135
 136        for (i = 0; i < enic->intr_count; i++) {
 137                if (enic_is_err_intr(enic, i) || enic_is_notify_intr(enic, i))
 138                        continue;
 139                free_cpumask_var(enic->msix[i].affinity_mask);
 140        }
 141}
 142
 143static void enic_set_affinity_hint(struct enic *enic)
 144{
 145        int i;
 146        int err;
 147
 148        for (i = 0; i < enic->intr_count; i++) {
 149                if (enic_is_err_intr(enic, i)           ||
 150                    enic_is_notify_intr(enic, i)        ||
 151                    !cpumask_available(enic->msix[i].affinity_mask) ||
 152                    cpumask_empty(enic->msix[i].affinity_mask))
 153                        continue;
 154                err = irq_set_affinity_hint(enic->msix_entry[i].vector,
 155                                            enic->msix[i].affinity_mask);
 156                if (err)
 157                        netdev_warn(enic->netdev, "irq_set_affinity_hint failed, err %d\n",
 158                                    err);
 159        }
 160
 161        for (i = 0; i < enic->wq_count; i++) {
 162                int wq_intr = enic_msix_wq_intr(enic, i);
 163
 164                if (cpumask_available(enic->msix[wq_intr].affinity_mask) &&
 165                    !cpumask_empty(enic->msix[wq_intr].affinity_mask))
 166                        netif_set_xps_queue(enic->netdev,
 167                                            enic->msix[wq_intr].affinity_mask,
 168                                            i);
 169        }
 170}
 171
 172static void enic_unset_affinity_hint(struct enic *enic)
 173{
 174        int i;
 175
 176        for (i = 0; i < enic->intr_count; i++)
 177                irq_set_affinity_hint(enic->msix_entry[i].vector, NULL);
 178}
 179
 180static void enic_udp_tunnel_add(struct net_device *netdev,
 181                                struct udp_tunnel_info *ti)
 182{
 183        struct enic *enic = netdev_priv(netdev);
 184        __be16 port = ti->port;
 185        int err;
 186
 187        spin_lock_bh(&enic->devcmd_lock);
 188
 189        if (ti->type != UDP_TUNNEL_TYPE_VXLAN) {
 190                netdev_info(netdev, "udp_tnl: only vxlan tunnel offload supported");
 191                goto error;
 192        }
 193
 194        switch (ti->sa_family) {
 195        case AF_INET6:
 196                if (!(enic->vxlan.flags & ENIC_VXLAN_OUTER_IPV6)) {
 197                        netdev_info(netdev, "vxlan: only IPv4 offload supported");
 198                        goto error;
 199                }
 200                /* Fall through */
 201        case AF_INET:
 202                break;
 203        default:
 204                goto error;
 205        }
 206
 207        if (enic->vxlan.vxlan_udp_port_number) {
 208                if (ntohs(port) == enic->vxlan.vxlan_udp_port_number)
 209                        netdev_warn(netdev, "vxlan: udp port already offloaded");
 210                else
 211                        netdev_info(netdev, "vxlan: offload supported for only one UDP port");
 212
 213                goto error;
 214        }
 215        if ((vnic_dev_get_res_count(enic->vdev, RES_TYPE_WQ) != 1) &&
 216            !(enic->vxlan.flags & ENIC_VXLAN_MULTI_WQ)) {
 217                netdev_info(netdev, "vxlan: vxlan offload with multi wq not supported on this adapter");
 218                goto error;
 219        }
 220
 221        err = vnic_dev_overlay_offload_cfg(enic->vdev,
 222                                           OVERLAY_CFG_VXLAN_PORT_UPDATE,
 223                                           ntohs(port));
 224        if (err)
 225                goto error;
 226
 227        err = vnic_dev_overlay_offload_ctrl(enic->vdev, OVERLAY_FEATURE_VXLAN,
 228                                            enic->vxlan.patch_level);
 229        if (err)
 230                goto error;
 231
 232        enic->vxlan.vxlan_udp_port_number = ntohs(port);
 233
 234        netdev_info(netdev, "vxlan fw-vers-%d: offload enabled for udp port: %d, sa_family: %d ",
 235                    (int)enic->vxlan.patch_level, ntohs(port), ti->sa_family);
 236
 237        goto unlock;
 238
 239error:
 240        netdev_info(netdev, "failed to offload udp port: %d, sa_family: %d, type: %d",
 241                    ntohs(port), ti->sa_family, ti->type);
 242unlock:
 243        spin_unlock_bh(&enic->devcmd_lock);
 244}
 245
 246static void enic_udp_tunnel_del(struct net_device *netdev,
 247                                struct udp_tunnel_info *ti)
 248{
 249        struct enic *enic = netdev_priv(netdev);
 250        int err;
 251
 252        spin_lock_bh(&enic->devcmd_lock);
 253
 254        if ((ntohs(ti->port) != enic->vxlan.vxlan_udp_port_number) ||
 255            ti->type != UDP_TUNNEL_TYPE_VXLAN) {
 256                netdev_info(netdev, "udp_tnl: port:%d, sa_family: %d, type: %d not offloaded",
 257                            ntohs(ti->port), ti->sa_family, ti->type);
 258                goto unlock;
 259        }
 260
 261        err = vnic_dev_overlay_offload_ctrl(enic->vdev, OVERLAY_FEATURE_VXLAN,
 262                                            OVERLAY_OFFLOAD_DISABLE);
 263        if (err) {
 264                netdev_err(netdev, "vxlan: del offload udp port: %d failed",
 265                           ntohs(ti->port));
 266                goto unlock;
 267        }
 268
 269        enic->vxlan.vxlan_udp_port_number = 0;
 270
 271        netdev_info(netdev, "vxlan: del offload udp port %d, family %d\n",
 272                    ntohs(ti->port), ti->sa_family);
 273
 274unlock:
 275        spin_unlock_bh(&enic->devcmd_lock);
 276}
 277
 278static netdev_features_t enic_features_check(struct sk_buff *skb,
 279                                             struct net_device *dev,
 280                                             netdev_features_t features)
 281{
 282        const struct ethhdr *eth = (struct ethhdr *)skb_inner_mac_header(skb);
 283        struct enic *enic = netdev_priv(dev);
 284        struct udphdr *udph;
 285        u16 port = 0;
 286        u8 proto;
 287
 288        if (!skb->encapsulation)
 289                return features;
 290
 291        features = vxlan_features_check(skb, features);
 292
 293        switch (vlan_get_protocol(skb)) {
 294        case htons(ETH_P_IPV6):
 295                if (!(enic->vxlan.flags & ENIC_VXLAN_OUTER_IPV6))
 296                        goto out;
 297                proto = ipv6_hdr(skb)->nexthdr;
 298                break;
 299        case htons(ETH_P_IP):
 300                proto = ip_hdr(skb)->protocol;
 301                break;
 302        default:
 303                goto out;
 304        }
 305
 306        switch (eth->h_proto) {
 307        case ntohs(ETH_P_IPV6):
 308                if (!(enic->vxlan.flags & ENIC_VXLAN_INNER_IPV6))
 309                        goto out;
 310                /* Fall through */
 311        case ntohs(ETH_P_IP):
 312                break;
 313        default:
 314                goto out;
 315        }
 316
 317
 318        if (proto == IPPROTO_UDP) {
 319                udph = udp_hdr(skb);
 320                port = be16_to_cpu(udph->dest);
 321        }
 322
 323        /* HW supports offload of only one UDP port. Remove CSUM and GSO MASK
 324         * for other UDP port tunnels
 325         */
 326        if (port  != enic->vxlan.vxlan_udp_port_number)
 327                goto out;
 328
 329        return features;
 330
 331out:
 332        return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
 333}
 334
 335int enic_is_dynamic(struct enic *enic)
 336{
 337        return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_DYN;
 338}
 339
 340int enic_sriov_enabled(struct enic *enic)
 341{
 342        return (enic->priv_flags & ENIC_SRIOV_ENABLED) ? 1 : 0;
 343}
 344
 345static int enic_is_sriov_vf(struct enic *enic)
 346{
 347        return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_VF;
 348}
 349
 350int enic_is_valid_vf(struct enic *enic, int vf)
 351{
 352#ifdef CONFIG_PCI_IOV
 353        return vf >= 0 && vf < enic->num_vfs;
 354#else
 355        return 0;
 356#endif
 357}
 358
 359static void enic_free_wq_buf(struct vnic_wq *wq, struct vnic_wq_buf *buf)
 360{
 361        struct enic *enic = vnic_dev_priv(wq->vdev);
 362
 363        if (buf->sop)
 364                pci_unmap_single(enic->pdev, buf->dma_addr,
 365                        buf->len, PCI_DMA_TODEVICE);
 366        else
 367                pci_unmap_page(enic->pdev, buf->dma_addr,
 368                        buf->len, PCI_DMA_TODEVICE);
 369
 370        if (buf->os_buf)
 371                dev_kfree_skb_any(buf->os_buf);
 372}
 373
 374static void enic_wq_free_buf(struct vnic_wq *wq,
 375        struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque)
 376{
 377        enic_free_wq_buf(wq, buf);
 378}
 379
 380static int enic_wq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
 381        u8 type, u16 q_number, u16 completed_index, void *opaque)
 382{
 383        struct enic *enic = vnic_dev_priv(vdev);
 384
 385        spin_lock(&enic->wq_lock[q_number]);
 386
 387        vnic_wq_service(&enic->wq[q_number], cq_desc,
 388                completed_index, enic_wq_free_buf,
 389                opaque);
 390
 391        if (netif_tx_queue_stopped(netdev_get_tx_queue(enic->netdev, q_number)) &&
 392            vnic_wq_desc_avail(&enic->wq[q_number]) >=
 393            (MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS))
 394                netif_wake_subqueue(enic->netdev, q_number);
 395
 396        spin_unlock(&enic->wq_lock[q_number]);
 397
 398        return 0;
 399}
 400
 401static bool enic_log_q_error(struct enic *enic)
 402{
 403        unsigned int i;
 404        u32 error_status;
 405        bool err = false;
 406
 407        for (i = 0; i < enic->wq_count; i++) {
 408                error_status = vnic_wq_error_status(&enic->wq[i]);
 409                err |= error_status;
 410                if (error_status)
 411                        netdev_err(enic->netdev, "WQ[%d] error_status %d\n",
 412                                i, error_status);
 413        }
 414
 415        for (i = 0; i < enic->rq_count; i++) {
 416                error_status = vnic_rq_error_status(&enic->rq[i]);
 417                err |= error_status;
 418                if (error_status)
 419                        netdev_err(enic->netdev, "RQ[%d] error_status %d\n",
 420                                i, error_status);
 421        }
 422
 423        return err;
 424}
 425
 426static void enic_msglvl_check(struct enic *enic)
 427{
 428        u32 msg_enable = vnic_dev_msg_lvl(enic->vdev);
 429
 430        if (msg_enable != enic->msg_enable) {
 431                netdev_info(enic->netdev, "msg lvl changed from 0x%x to 0x%x\n",
 432                        enic->msg_enable, msg_enable);
 433                enic->msg_enable = msg_enable;
 434        }
 435}
 436
 437static void enic_mtu_check(struct enic *enic)
 438{
 439        u32 mtu = vnic_dev_mtu(enic->vdev);
 440        struct net_device *netdev = enic->netdev;
 441
 442        if (mtu && mtu != enic->port_mtu) {
 443                enic->port_mtu = mtu;
 444                if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) {
 445                        mtu = max_t(int, ENIC_MIN_MTU,
 446                                min_t(int, ENIC_MAX_MTU, mtu));
 447                        if (mtu != netdev->mtu)
 448                                schedule_work(&enic->change_mtu_work);
 449                } else {
 450                        if (mtu < netdev->mtu)
 451                                netdev_warn(netdev,
 452                                        "interface MTU (%d) set higher "
 453                                        "than switch port MTU (%d)\n",
 454                                        netdev->mtu, mtu);
 455                }
 456        }
 457}
 458
 459static void enic_link_check(struct enic *enic)
 460{
 461        int link_status = vnic_dev_link_status(enic->vdev);
 462        int carrier_ok = netif_carrier_ok(enic->netdev);
 463
 464        if (link_status && !carrier_ok) {
 465                netdev_info(enic->netdev, "Link UP\n");
 466                netif_carrier_on(enic->netdev);
 467        } else if (!link_status && carrier_ok) {
 468                netdev_info(enic->netdev, "Link DOWN\n");
 469                netif_carrier_off(enic->netdev);
 470        }
 471}
 472
 473static void enic_notify_check(struct enic *enic)
 474{
 475        enic_msglvl_check(enic);
 476        enic_mtu_check(enic);
 477        enic_link_check(enic);
 478}
 479
 480#define ENIC_TEST_INTR(pba, i) (pba & (1 << i))
 481
 482static irqreturn_t enic_isr_legacy(int irq, void *data)
 483{
 484        struct net_device *netdev = data;
 485        struct enic *enic = netdev_priv(netdev);
 486        unsigned int io_intr = enic_legacy_io_intr();
 487        unsigned int err_intr = enic_legacy_err_intr();
 488        unsigned int notify_intr = enic_legacy_notify_intr();
 489        u32 pba;
 490
 491        vnic_intr_mask(&enic->intr[io_intr]);
 492
 493        pba = vnic_intr_legacy_pba(enic->legacy_pba);
 494        if (!pba) {
 495                vnic_intr_unmask(&enic->intr[io_intr]);
 496                return IRQ_NONE;        /* not our interrupt */
 497        }
 498
 499        if (ENIC_TEST_INTR(pba, notify_intr)) {
 500                enic_notify_check(enic);
 501                vnic_intr_return_all_credits(&enic->intr[notify_intr]);
 502        }
 503
 504        if (ENIC_TEST_INTR(pba, err_intr)) {
 505                vnic_intr_return_all_credits(&enic->intr[err_intr]);
 506                enic_log_q_error(enic);
 507                /* schedule recovery from WQ/RQ error */
 508                schedule_work(&enic->reset);
 509                return IRQ_HANDLED;
 510        }
 511
 512        if (ENIC_TEST_INTR(pba, io_intr))
 513                napi_schedule_irqoff(&enic->napi[0]);
 514        else
 515                vnic_intr_unmask(&enic->intr[io_intr]);
 516
 517        return IRQ_HANDLED;
 518}
 519
 520static irqreturn_t enic_isr_msi(int irq, void *data)
 521{
 522        struct enic *enic = data;
 523
 524        /* With MSI, there is no sharing of interrupts, so this is
 525         * our interrupt and there is no need to ack it.  The device
 526         * is not providing per-vector masking, so the OS will not
 527         * write to PCI config space to mask/unmask the interrupt.
 528         * We're using mask_on_assertion for MSI, so the device
 529         * automatically masks the interrupt when the interrupt is
 530         * generated.  Later, when exiting polling, the interrupt
 531         * will be unmasked (see enic_poll).
 532         *
 533         * Also, the device uses the same PCIe Traffic Class (TC)
 534         * for Memory Write data and MSI, so there are no ordering
 535         * issues; the MSI will always arrive at the Root Complex
 536         * _after_ corresponding Memory Writes (i.e. descriptor
 537         * writes).
 538         */
 539
 540        napi_schedule_irqoff(&enic->napi[0]);
 541
 542        return IRQ_HANDLED;
 543}
 544
 545static irqreturn_t enic_isr_msix(int irq, void *data)
 546{
 547        struct napi_struct *napi = data;
 548
 549        napi_schedule_irqoff(napi);
 550
 551        return IRQ_HANDLED;
 552}
 553
 554static irqreturn_t enic_isr_msix_err(int irq, void *data)
 555{
 556        struct enic *enic = data;
 557        unsigned int intr = enic_msix_err_intr(enic);
 558
 559        vnic_intr_return_all_credits(&enic->intr[intr]);
 560
 561        if (enic_log_q_error(enic))
 562                /* schedule recovery from WQ/RQ error */
 563                schedule_work(&enic->reset);
 564
 565        return IRQ_HANDLED;
 566}
 567
 568static irqreturn_t enic_isr_msix_notify(int irq, void *data)
 569{
 570        struct enic *enic = data;
 571        unsigned int intr = enic_msix_notify_intr(enic);
 572
 573        enic_notify_check(enic);
 574        vnic_intr_return_all_credits(&enic->intr[intr]);
 575
 576        return IRQ_HANDLED;
 577}
 578
 579static int enic_queue_wq_skb_cont(struct enic *enic, struct vnic_wq *wq,
 580                                  struct sk_buff *skb, unsigned int len_left,
 581                                  int loopback)
 582{
 583        const skb_frag_t *frag;
 584        dma_addr_t dma_addr;
 585
 586        /* Queue additional data fragments */
 587        for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
 588                len_left -= skb_frag_size(frag);
 589                dma_addr = skb_frag_dma_map(&enic->pdev->dev, frag, 0,
 590                                            skb_frag_size(frag),
 591                                            DMA_TO_DEVICE);
 592                if (unlikely(enic_dma_map_check(enic, dma_addr)))
 593                        return -ENOMEM;
 594                enic_queue_wq_desc_cont(wq, skb, dma_addr, skb_frag_size(frag),
 595                                        (len_left == 0),        /* EOP? */
 596                                        loopback);
 597        }
 598
 599        return 0;
 600}
 601
 602static int enic_queue_wq_skb_vlan(struct enic *enic, struct vnic_wq *wq,
 603                                  struct sk_buff *skb, int vlan_tag_insert,
 604                                  unsigned int vlan_tag, int loopback)
 605{
 606        unsigned int head_len = skb_headlen(skb);
 607        unsigned int len_left = skb->len - head_len;
 608        int eop = (len_left == 0);
 609        dma_addr_t dma_addr;
 610        int err = 0;
 611
 612        dma_addr = pci_map_single(enic->pdev, skb->data, head_len,
 613                                  PCI_DMA_TODEVICE);
 614        if (unlikely(enic_dma_map_check(enic, dma_addr)))
 615                return -ENOMEM;
 616
 617        /* Queue the main skb fragment. The fragments are no larger
 618         * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
 619         * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
 620         * per fragment is queued.
 621         */
 622        enic_queue_wq_desc(wq, skb, dma_addr, head_len, vlan_tag_insert,
 623                           vlan_tag, eop, loopback);
 624
 625        if (!eop)
 626                err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
 627
 628        return err;
 629}
 630
 631static int enic_queue_wq_skb_csum_l4(struct enic *enic, struct vnic_wq *wq,
 632                                     struct sk_buff *skb, int vlan_tag_insert,
 633                                     unsigned int vlan_tag, int loopback)
 634{
 635        unsigned int head_len = skb_headlen(skb);
 636        unsigned int len_left = skb->len - head_len;
 637        unsigned int hdr_len = skb_checksum_start_offset(skb);
 638        unsigned int csum_offset = hdr_len + skb->csum_offset;
 639        int eop = (len_left == 0);
 640        dma_addr_t dma_addr;
 641        int err = 0;
 642
 643        dma_addr = pci_map_single(enic->pdev, skb->data, head_len,
 644                                  PCI_DMA_TODEVICE);
 645        if (unlikely(enic_dma_map_check(enic, dma_addr)))
 646                return -ENOMEM;
 647
 648        /* Queue the main skb fragment. The fragments are no larger
 649         * than max MTU(9000)+ETH_HDR_LEN(14) bytes, which is less
 650         * than WQ_ENET_MAX_DESC_LEN length. So only one descriptor
 651         * per fragment is queued.
 652         */
 653        enic_queue_wq_desc_csum_l4(wq, skb, dma_addr, head_len, csum_offset,
 654                                   hdr_len, vlan_tag_insert, vlan_tag, eop,
 655                                   loopback);
 656
 657        if (!eop)
 658                err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
 659
 660        return err;
 661}
 662
 663static void enic_preload_tcp_csum_encap(struct sk_buff *skb)
 664{
 665        const struct ethhdr *eth = (struct ethhdr *)skb_inner_mac_header(skb);
 666
 667        switch (eth->h_proto) {
 668        case ntohs(ETH_P_IP):
 669                inner_ip_hdr(skb)->check = 0;
 670                inner_tcp_hdr(skb)->check =
 671                        ~csum_tcpudp_magic(inner_ip_hdr(skb)->saddr,
 672                                           inner_ip_hdr(skb)->daddr, 0,
 673                                           IPPROTO_TCP, 0);
 674                break;
 675        case ntohs(ETH_P_IPV6):
 676                inner_tcp_hdr(skb)->check =
 677                        ~csum_ipv6_magic(&inner_ipv6_hdr(skb)->saddr,
 678                                         &inner_ipv6_hdr(skb)->daddr, 0,
 679                                         IPPROTO_TCP, 0);
 680                break;
 681        default:
 682                WARN_ONCE(1, "Non ipv4/ipv6 inner pkt for encap offload");
 683                break;
 684        }
 685}
 686
 687static void enic_preload_tcp_csum(struct sk_buff *skb)
 688{
 689        /* Preload TCP csum field with IP pseudo hdr calculated
 690         * with IP length set to zero.  HW will later add in length
 691         * to each TCP segment resulting from the TSO.
 692         */
 693
 694        if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
 695                ip_hdr(skb)->check = 0;
 696                tcp_hdr(skb)->check = ~csum_tcpudp_magic(ip_hdr(skb)->saddr,
 697                        ip_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 698        } else if (skb->protocol == cpu_to_be16(ETH_P_IPV6)) {
 699                tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
 700                        &ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
 701        }
 702}
 703
 704static int enic_queue_wq_skb_tso(struct enic *enic, struct vnic_wq *wq,
 705                                 struct sk_buff *skb, unsigned int mss,
 706                                 int vlan_tag_insert, unsigned int vlan_tag,
 707                                 int loopback)
 708{
 709        unsigned int frag_len_left = skb_headlen(skb);
 710        unsigned int len_left = skb->len - frag_len_left;
 711        int eop = (len_left == 0);
 712        unsigned int offset = 0;
 713        unsigned int hdr_len;
 714        dma_addr_t dma_addr;
 715        unsigned int len;
 716        skb_frag_t *frag;
 717
 718        if (skb->encapsulation) {
 719                hdr_len = skb_inner_transport_header(skb) - skb->data;
 720                hdr_len += inner_tcp_hdrlen(skb);
 721                enic_preload_tcp_csum_encap(skb);
 722        } else {
 723                hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
 724                enic_preload_tcp_csum(skb);
 725        }
 726
 727        /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
 728         * for the main skb fragment
 729         */
 730        while (frag_len_left) {
 731                len = min(frag_len_left, (unsigned int)WQ_ENET_MAX_DESC_LEN);
 732                dma_addr = pci_map_single(enic->pdev, skb->data + offset, len,
 733                                          PCI_DMA_TODEVICE);
 734                if (unlikely(enic_dma_map_check(enic, dma_addr)))
 735                        return -ENOMEM;
 736                enic_queue_wq_desc_tso(wq, skb, dma_addr, len, mss, hdr_len,
 737                                       vlan_tag_insert, vlan_tag,
 738                                       eop && (len == frag_len_left), loopback);
 739                frag_len_left -= len;
 740                offset += len;
 741        }
 742
 743        if (eop)
 744                return 0;
 745
 746        /* Queue WQ_ENET_MAX_DESC_LEN length descriptors
 747         * for additional data fragments
 748         */
 749        for (frag = skb_shinfo(skb)->frags; len_left; frag++) {
 750                len_left -= skb_frag_size(frag);
 751                frag_len_left = skb_frag_size(frag);
 752                offset = 0;
 753
 754                while (frag_len_left) {
 755                        len = min(frag_len_left,
 756                                (unsigned int)WQ_ENET_MAX_DESC_LEN);
 757                        dma_addr = skb_frag_dma_map(&enic->pdev->dev, frag,
 758                                                    offset, len,
 759                                                    DMA_TO_DEVICE);
 760                        if (unlikely(enic_dma_map_check(enic, dma_addr)))
 761                                return -ENOMEM;
 762                        enic_queue_wq_desc_cont(wq, skb, dma_addr, len,
 763                                                (len_left == 0) &&
 764                                                 (len == frag_len_left),/*EOP*/
 765                                                loopback);
 766                        frag_len_left -= len;
 767                        offset += len;
 768                }
 769        }
 770
 771        return 0;
 772}
 773
 774static inline int enic_queue_wq_skb_encap(struct enic *enic, struct vnic_wq *wq,
 775                                          struct sk_buff *skb,
 776                                          int vlan_tag_insert,
 777                                          unsigned int vlan_tag, int loopback)
 778{
 779        unsigned int head_len = skb_headlen(skb);
 780        unsigned int len_left = skb->len - head_len;
 781        /* Hardware will overwrite the checksum fields, calculating from
 782         * scratch and ignoring the value placed by software.
 783         * Offload mode = 00
 784         * mss[2], mss[1], mss[0] bits are set
 785         */
 786        unsigned int mss_or_csum = 7;
 787        int eop = (len_left == 0);
 788        dma_addr_t dma_addr;
 789        int err = 0;
 790
 791        dma_addr = pci_map_single(enic->pdev, skb->data, head_len,
 792                                  PCI_DMA_TODEVICE);
 793        if (unlikely(enic_dma_map_check(enic, dma_addr)))
 794                return -ENOMEM;
 795
 796        enic_queue_wq_desc_ex(wq, skb, dma_addr, head_len, mss_or_csum, 0,
 797                              vlan_tag_insert, vlan_tag,
 798                              WQ_ENET_OFFLOAD_MODE_CSUM, eop, 1 /* SOP */, eop,
 799                              loopback);
 800        if (!eop)
 801                err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
 802
 803        return err;
 804}
 805
 806static inline void enic_queue_wq_skb(struct enic *enic,
 807        struct vnic_wq *wq, struct sk_buff *skb)
 808{
 809        unsigned int mss = skb_shinfo(skb)->gso_size;
 810        unsigned int vlan_tag = 0;
 811        int vlan_tag_insert = 0;
 812        int loopback = 0;
 813        int err;
 814
 815        if (skb_vlan_tag_present(skb)) {
 816                /* VLAN tag from trunking driver */
 817                vlan_tag_insert = 1;
 818                vlan_tag = skb_vlan_tag_get(skb);
 819        } else if (enic->loop_enable) {
 820                vlan_tag = enic->loop_tag;
 821                loopback = 1;
 822        }
 823
 824        if (mss)
 825                err = enic_queue_wq_skb_tso(enic, wq, skb, mss,
 826                                            vlan_tag_insert, vlan_tag,
 827                                            loopback);
 828        else if (skb->encapsulation)
 829                err = enic_queue_wq_skb_encap(enic, wq, skb, vlan_tag_insert,
 830                                              vlan_tag, loopback);
 831        else if (skb->ip_summed == CHECKSUM_PARTIAL)
 832                err = enic_queue_wq_skb_csum_l4(enic, wq, skb, vlan_tag_insert,
 833                                                vlan_tag, loopback);
 834        else
 835                err = enic_queue_wq_skb_vlan(enic, wq, skb, vlan_tag_insert,
 836                                             vlan_tag, loopback);
 837        if (unlikely(err)) {
 838                struct vnic_wq_buf *buf;
 839
 840                buf = wq->to_use->prev;
 841                /* while not EOP of previous pkt && queue not empty.
 842                 * For all non EOP bufs, os_buf is NULL.
 843                 */
 844                while (!buf->os_buf && (buf->next != wq->to_clean)) {
 845                        enic_free_wq_buf(wq, buf);
 846                        wq->ring.desc_avail++;
 847                        buf = buf->prev;
 848                }
 849                wq->to_use = buf->next;
 850                dev_kfree_skb(skb);
 851        }
 852}
 853
 854/* netif_tx_lock held, process context with BHs disabled, or BH */
 855static netdev_tx_t enic_hard_start_xmit(struct sk_buff *skb,
 856        struct net_device *netdev)
 857{
 858        struct enic *enic = netdev_priv(netdev);
 859        struct vnic_wq *wq;
 860        unsigned int txq_map;
 861        struct netdev_queue *txq;
 862
 863        if (skb->len <= 0) {
 864                dev_kfree_skb_any(skb);
 865                return NETDEV_TX_OK;
 866        }
 867
 868        txq_map = skb_get_queue_mapping(skb) % enic->wq_count;
 869        wq = &enic->wq[txq_map];
 870        txq = netdev_get_tx_queue(netdev, txq_map);
 871
 872        /* Non-TSO sends must fit within ENIC_NON_TSO_MAX_DESC descs,
 873         * which is very likely.  In the off chance it's going to take
 874         * more than * ENIC_NON_TSO_MAX_DESC, linearize the skb.
 875         */
 876
 877        if (skb_shinfo(skb)->gso_size == 0 &&
 878            skb_shinfo(skb)->nr_frags + 1 > ENIC_NON_TSO_MAX_DESC &&
 879            skb_linearize(skb)) {
 880                dev_kfree_skb_any(skb);
 881                return NETDEV_TX_OK;
 882        }
 883
 884        spin_lock(&enic->wq_lock[txq_map]);
 885
 886        if (vnic_wq_desc_avail(wq) <
 887            skb_shinfo(skb)->nr_frags + ENIC_DESC_MAX_SPLITS) {
 888                netif_tx_stop_queue(txq);
 889                /* This is a hard error, log it */
 890                netdev_err(netdev, "BUG! Tx ring full when queue awake!\n");
 891                spin_unlock(&enic->wq_lock[txq_map]);
 892                return NETDEV_TX_BUSY;
 893        }
 894
 895        enic_queue_wq_skb(enic, wq, skb);
 896
 897        if (vnic_wq_desc_avail(wq) < MAX_SKB_FRAGS + ENIC_DESC_MAX_SPLITS)
 898                netif_tx_stop_queue(txq);
 899        skb_tx_timestamp(skb);
 900        if (!netdev_xmit_more() || netif_xmit_stopped(txq))
 901                vnic_wq_doorbell(wq);
 902
 903        spin_unlock(&enic->wq_lock[txq_map]);
 904
 905        return NETDEV_TX_OK;
 906}
 907
 908/* dev_base_lock rwlock held, nominally process context */
 909static void enic_get_stats(struct net_device *netdev,
 910                           struct rtnl_link_stats64 *net_stats)
 911{
 912        struct enic *enic = netdev_priv(netdev);
 913        struct vnic_stats *stats;
 914        int err;
 915
 916        err = enic_dev_stats_dump(enic, &stats);
 917        /* return only when pci_zalloc_consistent fails in vnic_dev_stats_dump
 918         * For other failures, like devcmd failure, we return previously
 919         * recorded stats.
 920         */
 921        if (err == -ENOMEM)
 922                return;
 923
 924        net_stats->tx_packets = stats->tx.tx_frames_ok;
 925        net_stats->tx_bytes = stats->tx.tx_bytes_ok;
 926        net_stats->tx_errors = stats->tx.tx_errors;
 927        net_stats->tx_dropped = stats->tx.tx_drops;
 928
 929        net_stats->rx_packets = stats->rx.rx_frames_ok;
 930        net_stats->rx_bytes = stats->rx.rx_bytes_ok;
 931        net_stats->rx_errors = stats->rx.rx_errors;
 932        net_stats->multicast = stats->rx.rx_multicast_frames_ok;
 933        net_stats->rx_over_errors = enic->rq_truncated_pkts;
 934        net_stats->rx_crc_errors = enic->rq_bad_fcs;
 935        net_stats->rx_dropped = stats->rx.rx_no_bufs + stats->rx.rx_drop;
 936}
 937
 938static int enic_mc_sync(struct net_device *netdev, const u8 *mc_addr)
 939{
 940        struct enic *enic = netdev_priv(netdev);
 941
 942        if (enic->mc_count == ENIC_MULTICAST_PERFECT_FILTERS) {
 943                unsigned int mc_count = netdev_mc_count(netdev);
 944
 945                netdev_warn(netdev, "Registering only %d out of %d multicast addresses\n",
 946                            ENIC_MULTICAST_PERFECT_FILTERS, mc_count);
 947
 948                return -ENOSPC;
 949        }
 950
 951        enic_dev_add_addr(enic, mc_addr);
 952        enic->mc_count++;
 953
 954        return 0;
 955}
 956
 957static int enic_mc_unsync(struct net_device *netdev, const u8 *mc_addr)
 958{
 959        struct enic *enic = netdev_priv(netdev);
 960
 961        enic_dev_del_addr(enic, mc_addr);
 962        enic->mc_count--;
 963
 964        return 0;
 965}
 966
 967static int enic_uc_sync(struct net_device *netdev, const u8 *uc_addr)
 968{
 969        struct enic *enic = netdev_priv(netdev);
 970
 971        if (enic->uc_count == ENIC_UNICAST_PERFECT_FILTERS) {
 972                unsigned int uc_count = netdev_uc_count(netdev);
 973
 974                netdev_warn(netdev, "Registering only %d out of %d unicast addresses\n",
 975                            ENIC_UNICAST_PERFECT_FILTERS, uc_count);
 976
 977                return -ENOSPC;
 978        }
 979
 980        enic_dev_add_addr(enic, uc_addr);
 981        enic->uc_count++;
 982
 983        return 0;
 984}
 985
 986static int enic_uc_unsync(struct net_device *netdev, const u8 *uc_addr)
 987{
 988        struct enic *enic = netdev_priv(netdev);
 989
 990        enic_dev_del_addr(enic, uc_addr);
 991        enic->uc_count--;
 992
 993        return 0;
 994}
 995
 996void enic_reset_addr_lists(struct enic *enic)
 997{
 998        struct net_device *netdev = enic->netdev;
 999
1000        __dev_uc_unsync(netdev, NULL);
1001        __dev_mc_unsync(netdev, NULL);
1002
1003        enic->mc_count = 0;
1004        enic->uc_count = 0;
1005        enic->flags = 0;
1006}
1007
1008static int enic_set_mac_addr(struct net_device *netdev, char *addr)
1009{
1010        struct enic *enic = netdev_priv(netdev);
1011
1012        if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic)) {
1013                if (!is_valid_ether_addr(addr) && !is_zero_ether_addr(addr))
1014                        return -EADDRNOTAVAIL;
1015        } else {
1016                if (!is_valid_ether_addr(addr))
1017                        return -EADDRNOTAVAIL;
1018        }
1019
1020        memcpy(netdev->dev_addr, addr, netdev->addr_len);
1021
1022        return 0;
1023}
1024
1025static int enic_set_mac_address_dynamic(struct net_device *netdev, void *p)
1026{
1027        struct enic *enic = netdev_priv(netdev);
1028        struct sockaddr *saddr = p;
1029        char *addr = saddr->sa_data;
1030        int err;
1031
1032        if (netif_running(enic->netdev)) {
1033                err = enic_dev_del_station_addr(enic);
1034                if (err)
1035                        return err;
1036        }
1037
1038        err = enic_set_mac_addr(netdev, addr);
1039        if (err)
1040                return err;
1041
1042        if (netif_running(enic->netdev)) {
1043                err = enic_dev_add_station_addr(enic);
1044                if (err)
1045                        return err;
1046        }
1047
1048        return err;
1049}
1050
1051static int enic_set_mac_address(struct net_device *netdev, void *p)
1052{
1053        struct sockaddr *saddr = p;
1054        char *addr = saddr->sa_data;
1055        struct enic *enic = netdev_priv(netdev);
1056        int err;
1057
1058        err = enic_dev_del_station_addr(enic);
1059        if (err)
1060                return err;
1061
1062        err = enic_set_mac_addr(netdev, addr);
1063        if (err)
1064                return err;
1065
1066        return enic_dev_add_station_addr(enic);
1067}
1068
1069/* netif_tx_lock held, BHs disabled */
1070static void enic_set_rx_mode(struct net_device *netdev)
1071{
1072        struct enic *enic = netdev_priv(netdev);
1073        int directed = 1;
1074        int multicast = (netdev->flags & IFF_MULTICAST) ? 1 : 0;
1075        int broadcast = (netdev->flags & IFF_BROADCAST) ? 1 : 0;
1076        int promisc = (netdev->flags & IFF_PROMISC) ||
1077                netdev_uc_count(netdev) > ENIC_UNICAST_PERFECT_FILTERS;
1078        int allmulti = (netdev->flags & IFF_ALLMULTI) ||
1079                netdev_mc_count(netdev) > ENIC_MULTICAST_PERFECT_FILTERS;
1080        unsigned int flags = netdev->flags |
1081                (allmulti ? IFF_ALLMULTI : 0) |
1082                (promisc ? IFF_PROMISC : 0);
1083
1084        if (enic->flags != flags) {
1085                enic->flags = flags;
1086                enic_dev_packet_filter(enic, directed,
1087                        multicast, broadcast, promisc, allmulti);
1088        }
1089
1090        if (!promisc) {
1091                __dev_uc_sync(netdev, enic_uc_sync, enic_uc_unsync);
1092                if (!allmulti)
1093                        __dev_mc_sync(netdev, enic_mc_sync, enic_mc_unsync);
1094        }
1095}
1096
1097/* netif_tx_lock held, BHs disabled */
1098static void enic_tx_timeout(struct net_device *netdev, unsigned int txqueue)
1099{
1100        struct enic *enic = netdev_priv(netdev);
1101        schedule_work(&enic->tx_hang_reset);
1102}
1103
1104static int enic_set_vf_mac(struct net_device *netdev, int vf, u8 *mac)
1105{
1106        struct enic *enic = netdev_priv(netdev);
1107        struct enic_port_profile *pp;
1108        int err;
1109
1110        ENIC_PP_BY_INDEX(enic, vf, pp, &err);
1111        if (err)
1112                return err;
1113
1114        if (is_valid_ether_addr(mac) || is_zero_ether_addr(mac)) {
1115                if (vf == PORT_SELF_VF) {
1116                        memcpy(pp->vf_mac, mac, ETH_ALEN);
1117                        return 0;
1118                } else {
1119                        /*
1120                         * For sriov vf's set the mac in hw
1121                         */
1122                        ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
1123                                vnic_dev_set_mac_addr, mac);
1124                        return enic_dev_status_to_errno(err);
1125                }
1126        } else
1127                return -EINVAL;
1128}
1129
1130static int enic_set_vf_port(struct net_device *netdev, int vf,
1131        struct nlattr *port[])
1132{
1133        struct enic *enic = netdev_priv(netdev);
1134        struct enic_port_profile prev_pp;
1135        struct enic_port_profile *pp;
1136        int err = 0, restore_pp = 1;
1137
1138        ENIC_PP_BY_INDEX(enic, vf, pp, &err);
1139        if (err)
1140                return err;
1141
1142        if (!port[IFLA_PORT_REQUEST])
1143                return -EOPNOTSUPP;
1144
1145        memcpy(&prev_pp, pp, sizeof(*enic->pp));
1146        memset(pp, 0, sizeof(*enic->pp));
1147
1148        pp->set |= ENIC_SET_REQUEST;
1149        pp->request = nla_get_u8(port[IFLA_PORT_REQUEST]);
1150
1151        if (port[IFLA_PORT_PROFILE]) {
1152                pp->set |= ENIC_SET_NAME;
1153                memcpy(pp->name, nla_data(port[IFLA_PORT_PROFILE]),
1154                        PORT_PROFILE_MAX);
1155        }
1156
1157        if (port[IFLA_PORT_INSTANCE_UUID]) {
1158                pp->set |= ENIC_SET_INSTANCE;
1159                memcpy(pp->instance_uuid,
1160                        nla_data(port[IFLA_PORT_INSTANCE_UUID]), PORT_UUID_MAX);
1161        }
1162
1163        if (port[IFLA_PORT_HOST_UUID]) {
1164                pp->set |= ENIC_SET_HOST;
1165                memcpy(pp->host_uuid,
1166                        nla_data(port[IFLA_PORT_HOST_UUID]), PORT_UUID_MAX);
1167        }
1168
1169        if (vf == PORT_SELF_VF) {
1170                /* Special case handling: mac came from IFLA_VF_MAC */
1171                if (!is_zero_ether_addr(prev_pp.vf_mac))
1172                        memcpy(pp->mac_addr, prev_pp.vf_mac, ETH_ALEN);
1173
1174                if (is_zero_ether_addr(netdev->dev_addr))
1175                        eth_hw_addr_random(netdev);
1176        } else {
1177                /* SR-IOV VF: get mac from adapter */
1178                ENIC_DEVCMD_PROXY_BY_INDEX(vf, err, enic,
1179                        vnic_dev_get_mac_addr, pp->mac_addr);
1180                if (err) {
1181                        netdev_err(netdev, "Error getting mac for vf %d\n", vf);
1182                        memcpy(pp, &prev_pp, sizeof(*pp));
1183                        return enic_dev_status_to_errno(err);
1184                }
1185        }
1186
1187        err = enic_process_set_pp_request(enic, vf, &prev_pp, &restore_pp);
1188        if (err) {
1189                if (restore_pp) {
1190                        /* Things are still the way they were: Implicit
1191                         * DISASSOCIATE failed
1192                         */
1193                        memcpy(pp, &prev_pp, sizeof(*pp));
1194                } else {
1195                        memset(pp, 0, sizeof(*pp));
1196                        if (vf == PORT_SELF_VF)
1197                                eth_zero_addr(netdev->dev_addr);
1198                }
1199        } else {
1200                /* Set flag to indicate that the port assoc/disassoc
1201                 * request has been sent out to fw
1202                 */
1203                pp->set |= ENIC_PORT_REQUEST_APPLIED;
1204
1205                /* If DISASSOCIATE, clean up all assigned/saved macaddresses */
1206                if (pp->request == PORT_REQUEST_DISASSOCIATE) {
1207                        eth_zero_addr(pp->mac_addr);
1208                        if (vf == PORT_SELF_VF)
1209                                eth_zero_addr(netdev->dev_addr);
1210                }
1211        }
1212
1213        if (vf == PORT_SELF_VF)
1214                eth_zero_addr(pp->vf_mac);
1215
1216        return err;
1217}
1218
1219static int enic_get_vf_port(struct net_device *netdev, int vf,
1220        struct sk_buff *skb)
1221{
1222        struct enic *enic = netdev_priv(netdev);
1223        u16 response = PORT_PROFILE_RESPONSE_SUCCESS;
1224        struct enic_port_profile *pp;
1225        int err;
1226
1227        ENIC_PP_BY_INDEX(enic, vf, pp, &err);
1228        if (err)
1229                return err;
1230
1231        if (!(pp->set & ENIC_PORT_REQUEST_APPLIED))
1232                return -ENODATA;
1233
1234        err = enic_process_get_pp_request(enic, vf, pp->request, &response);
1235        if (err)
1236                return err;
1237
1238        if (nla_put_u16(skb, IFLA_PORT_REQUEST, pp->request) ||
1239            nla_put_u16(skb, IFLA_PORT_RESPONSE, response) ||
1240            ((pp->set & ENIC_SET_NAME) &&
1241             nla_put(skb, IFLA_PORT_PROFILE, PORT_PROFILE_MAX, pp->name)) ||
1242            ((pp->set & ENIC_SET_INSTANCE) &&
1243             nla_put(skb, IFLA_PORT_INSTANCE_UUID, PORT_UUID_MAX,
1244                     pp->instance_uuid)) ||
1245            ((pp->set & ENIC_SET_HOST) &&
1246             nla_put(skb, IFLA_PORT_HOST_UUID, PORT_UUID_MAX, pp->host_uuid)))
1247                goto nla_put_failure;
1248        return 0;
1249
1250nla_put_failure:
1251        return -EMSGSIZE;
1252}
1253
1254static void enic_free_rq_buf(struct vnic_rq *rq, struct vnic_rq_buf *buf)
1255{
1256        struct enic *enic = vnic_dev_priv(rq->vdev);
1257
1258        if (!buf->os_buf)
1259                return;
1260
1261        pci_unmap_single(enic->pdev, buf->dma_addr,
1262                buf->len, PCI_DMA_FROMDEVICE);
1263        dev_kfree_skb_any(buf->os_buf);
1264        buf->os_buf = NULL;
1265}
1266
1267static int enic_rq_alloc_buf(struct vnic_rq *rq)
1268{
1269        struct enic *enic = vnic_dev_priv(rq->vdev);
1270        struct net_device *netdev = enic->netdev;
1271        struct sk_buff *skb;
1272        unsigned int len = netdev->mtu + VLAN_ETH_HLEN;
1273        unsigned int os_buf_index = 0;
1274        dma_addr_t dma_addr;
1275        struct vnic_rq_buf *buf = rq->to_use;
1276
1277        if (buf->os_buf) {
1278                enic_queue_rq_desc(rq, buf->os_buf, os_buf_index, buf->dma_addr,
1279                                   buf->len);
1280
1281                return 0;
1282        }
1283        skb = netdev_alloc_skb_ip_align(netdev, len);
1284        if (!skb)
1285                return -ENOMEM;
1286
1287        dma_addr = pci_map_single(enic->pdev, skb->data, len,
1288                                  PCI_DMA_FROMDEVICE);
1289        if (unlikely(enic_dma_map_check(enic, dma_addr))) {
1290                dev_kfree_skb(skb);
1291                return -ENOMEM;
1292        }
1293
1294        enic_queue_rq_desc(rq, skb, os_buf_index,
1295                dma_addr, len);
1296
1297        return 0;
1298}
1299
1300static void enic_intr_update_pkt_size(struct vnic_rx_bytes_counter *pkt_size,
1301                                      u32 pkt_len)
1302{
1303        if (ENIC_LARGE_PKT_THRESHOLD <= pkt_len)
1304                pkt_size->large_pkt_bytes_cnt += pkt_len;
1305        else
1306                pkt_size->small_pkt_bytes_cnt += pkt_len;
1307}
1308
1309static bool enic_rxcopybreak(struct net_device *netdev, struct sk_buff **skb,
1310                             struct vnic_rq_buf *buf, u16 len)
1311{
1312        struct enic *enic = netdev_priv(netdev);
1313        struct sk_buff *new_skb;
1314
1315        if (len > enic->rx_copybreak)
1316                return false;
1317        new_skb = netdev_alloc_skb_ip_align(netdev, len);
1318        if (!new_skb)
1319                return false;
1320        pci_dma_sync_single_for_cpu(enic->pdev, buf->dma_addr, len,
1321                                    DMA_FROM_DEVICE);
1322        memcpy(new_skb->data, (*skb)->data, len);
1323        *skb = new_skb;
1324
1325        return true;
1326}
1327
1328static void enic_rq_indicate_buf(struct vnic_rq *rq,
1329        struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
1330        int skipped, void *opaque)
1331{
1332        struct enic *enic = vnic_dev_priv(rq->vdev);
1333        struct net_device *netdev = enic->netdev;
1334        struct sk_buff *skb;
1335        struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1336
1337        u8 type, color, eop, sop, ingress_port, vlan_stripped;
1338        u8 fcoe, fcoe_sof, fcoe_fc_crc_ok, fcoe_enc_error, fcoe_eof;
1339        u8 tcp_udp_csum_ok, udp, tcp, ipv4_csum_ok;
1340        u8 ipv6, ipv4, ipv4_fragment, fcs_ok, rss_type, csum_not_calc;
1341        u8 packet_error;
1342        u16 q_number, completed_index, bytes_written, vlan_tci, checksum;
1343        u32 rss_hash;
1344        bool outer_csum_ok = true, encap = false;
1345
1346        if (skipped)
1347                return;
1348
1349        skb = buf->os_buf;
1350
1351        cq_enet_rq_desc_dec((struct cq_enet_rq_desc *)cq_desc,
1352                &type, &color, &q_number, &completed_index,
1353                &ingress_port, &fcoe, &eop, &sop, &rss_type,
1354                &csum_not_calc, &rss_hash, &bytes_written,
1355                &packet_error, &vlan_stripped, &vlan_tci, &checksum,
1356                &fcoe_sof, &fcoe_fc_crc_ok, &fcoe_enc_error,
1357                &fcoe_eof, &tcp_udp_csum_ok, &udp, &tcp,
1358                &ipv4_csum_ok, &ipv6, &ipv4, &ipv4_fragment,
1359                &fcs_ok);
1360
1361        if (packet_error) {
1362
1363                if (!fcs_ok) {
1364                        if (bytes_written > 0)
1365                                enic->rq_bad_fcs++;
1366                        else if (bytes_written == 0)
1367                                enic->rq_truncated_pkts++;
1368                }
1369
1370                pci_unmap_single(enic->pdev, buf->dma_addr, buf->len,
1371                                 PCI_DMA_FROMDEVICE);
1372                dev_kfree_skb_any(skb);
1373                buf->os_buf = NULL;
1374
1375                return;
1376        }
1377
1378        if (eop && bytes_written > 0) {
1379
1380                /* Good receive
1381                 */
1382
1383                if (!enic_rxcopybreak(netdev, &skb, buf, bytes_written)) {
1384                        buf->os_buf = NULL;
1385                        pci_unmap_single(enic->pdev, buf->dma_addr, buf->len,
1386                                         PCI_DMA_FROMDEVICE);
1387                }
1388                prefetch(skb->data - NET_IP_ALIGN);
1389
1390                skb_put(skb, bytes_written);
1391                skb->protocol = eth_type_trans(skb, netdev);
1392                skb_record_rx_queue(skb, q_number);
1393                if ((netdev->features & NETIF_F_RXHASH) && rss_hash &&
1394                    (type == 3)) {
1395                        switch (rss_type) {
1396                        case CQ_ENET_RQ_DESC_RSS_TYPE_TCP_IPv4:
1397                        case CQ_ENET_RQ_DESC_RSS_TYPE_TCP_IPv6:
1398                        case CQ_ENET_RQ_DESC_RSS_TYPE_TCP_IPv6_EX:
1399                                skb_set_hash(skb, rss_hash, PKT_HASH_TYPE_L4);
1400                                break;
1401                        case CQ_ENET_RQ_DESC_RSS_TYPE_IPv4:
1402                        case CQ_ENET_RQ_DESC_RSS_TYPE_IPv6:
1403                        case CQ_ENET_RQ_DESC_RSS_TYPE_IPv6_EX:
1404                                skb_set_hash(skb, rss_hash, PKT_HASH_TYPE_L3);
1405                                break;
1406                        }
1407                }
1408                if (enic->vxlan.vxlan_udp_port_number) {
1409                        switch (enic->vxlan.patch_level) {
1410                        case 0:
1411                                if (fcoe) {
1412                                        encap = true;
1413                                        outer_csum_ok = fcoe_fc_crc_ok;
1414                                }
1415                                break;
1416                        case 2:
1417                                if ((type == 7) &&
1418                                    (rss_hash & BIT(0))) {
1419                                        encap = true;
1420                                        outer_csum_ok = (rss_hash & BIT(1)) &&
1421                                                        (rss_hash & BIT(2));
1422                                }
1423                                break;
1424                        }
1425                }
1426
1427                /* Hardware does not provide whole packet checksum. It only
1428                 * provides pseudo checksum. Since hw validates the packet
1429                 * checksum but not provide us the checksum value. use
1430                 * CHECSUM_UNNECESSARY.
1431                 *
1432                 * In case of encap pkt tcp_udp_csum_ok/tcp_udp_csum_ok is
1433                 * inner csum_ok. outer_csum_ok is set by hw when outer udp
1434                 * csum is correct or is zero.
1435                 */
1436                if ((netdev->features & NETIF_F_RXCSUM) && !csum_not_calc &&
1437                    tcp_udp_csum_ok && outer_csum_ok &&
1438                    (ipv4_csum_ok || ipv6)) {
1439                        skb->ip_summed = CHECKSUM_UNNECESSARY;
1440                        skb->csum_level = encap;
1441                }
1442
1443                if (vlan_stripped)
1444                        __vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tci);
1445
1446                skb_mark_napi_id(skb, &enic->napi[rq->index]);
1447                if (!(netdev->features & NETIF_F_GRO))
1448                        netif_receive_skb(skb);
1449                else
1450                        napi_gro_receive(&enic->napi[q_number], skb);
1451                if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1452                        enic_intr_update_pkt_size(&cq->pkt_size_counter,
1453                                                  bytes_written);
1454        } else {
1455
1456                /* Buffer overflow
1457                 */
1458
1459                pci_unmap_single(enic->pdev, buf->dma_addr, buf->len,
1460                                 PCI_DMA_FROMDEVICE);
1461                dev_kfree_skb_any(skb);
1462                buf->os_buf = NULL;
1463        }
1464}
1465
1466static int enic_rq_service(struct vnic_dev *vdev, struct cq_desc *cq_desc,
1467        u8 type, u16 q_number, u16 completed_index, void *opaque)
1468{
1469        struct enic *enic = vnic_dev_priv(vdev);
1470
1471        vnic_rq_service(&enic->rq[q_number], cq_desc,
1472                completed_index, VNIC_RQ_RETURN_DESC,
1473                enic_rq_indicate_buf, opaque);
1474
1475        return 0;
1476}
1477
1478static void enic_set_int_moderation(struct enic *enic, struct vnic_rq *rq)
1479{
1480        unsigned int intr = enic_msix_rq_intr(enic, rq->index);
1481        struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1482        u32 timer = cq->tobe_rx_coal_timeval;
1483
1484        if (cq->tobe_rx_coal_timeval != cq->cur_rx_coal_timeval) {
1485                vnic_intr_coalescing_timer_set(&enic->intr[intr], timer);
1486                cq->cur_rx_coal_timeval = cq->tobe_rx_coal_timeval;
1487        }
1488}
1489
1490static void enic_calc_int_moderation(struct enic *enic, struct vnic_rq *rq)
1491{
1492        struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
1493        struct vnic_cq *cq = &enic->cq[enic_cq_rq(enic, rq->index)];
1494        struct vnic_rx_bytes_counter *pkt_size_counter = &cq->pkt_size_counter;
1495        int index;
1496        u32 timer;
1497        u32 range_start;
1498        u32 traffic;
1499        u64 delta;
1500        ktime_t now = ktime_get();
1501
1502        delta = ktime_us_delta(now, cq->prev_ts);
1503        if (delta < ENIC_AIC_TS_BREAK)
1504                return;
1505        cq->prev_ts = now;
1506
1507        traffic = pkt_size_counter->large_pkt_bytes_cnt +
1508                  pkt_size_counter->small_pkt_bytes_cnt;
1509        /* The table takes Mbps
1510         * traffic *= 8    => bits
1511         * traffic *= (10^6 / delta)    => bps
1512         * traffic /= 10^6     => Mbps
1513         *
1514         * Combining, traffic *= (8 / delta)
1515         */
1516
1517        traffic <<= 3;
1518        traffic = delta > UINT_MAX ? 0 : traffic / (u32)delta;
1519
1520        for (index = 0; index < ENIC_MAX_COALESCE_TIMERS; index++)
1521                if (traffic < mod_table[index].rx_rate)
1522                        break;
1523        range_start = (pkt_size_counter->small_pkt_bytes_cnt >
1524                       pkt_size_counter->large_pkt_bytes_cnt << 1) ?
1525                      rx_coal->small_pkt_range_start :
1526                      rx_coal->large_pkt_range_start;
1527        timer = range_start + ((rx_coal->range_end - range_start) *
1528                               mod_table[index].range_percent / 100);
1529        /* Damping */
1530        cq->tobe_rx_coal_timeval = (timer + cq->tobe_rx_coal_timeval) >> 1;
1531
1532        pkt_size_counter->large_pkt_bytes_cnt = 0;
1533        pkt_size_counter->small_pkt_bytes_cnt = 0;
1534}
1535
1536static int enic_poll(struct napi_struct *napi, int budget)
1537{
1538        struct net_device *netdev = napi->dev;
1539        struct enic *enic = netdev_priv(netdev);
1540        unsigned int cq_rq = enic_cq_rq(enic, 0);
1541        unsigned int cq_wq = enic_cq_wq(enic, 0);
1542        unsigned int intr = enic_legacy_io_intr();
1543        unsigned int rq_work_to_do = budget;
1544        unsigned int wq_work_to_do = ENIC_WQ_NAPI_BUDGET;
1545        unsigned int  work_done, rq_work_done = 0, wq_work_done;
1546        int err;
1547
1548        wq_work_done = vnic_cq_service(&enic->cq[cq_wq], wq_work_to_do,
1549                                       enic_wq_service, NULL);
1550
1551        if (budget > 0)
1552                rq_work_done = vnic_cq_service(&enic->cq[cq_rq],
1553                        rq_work_to_do, enic_rq_service, NULL);
1554
1555        /* Accumulate intr event credits for this polling
1556         * cycle.  An intr event is the completion of a
1557         * a WQ or RQ packet.
1558         */
1559
1560        work_done = rq_work_done + wq_work_done;
1561
1562        if (work_done > 0)
1563                vnic_intr_return_credits(&enic->intr[intr],
1564                        work_done,
1565                        0 /* don't unmask intr */,
1566                        0 /* don't reset intr timer */);
1567
1568        err = vnic_rq_fill(&enic->rq[0], enic_rq_alloc_buf);
1569
1570        /* Buffer allocation failed. Stay in polling
1571         * mode so we can try to fill the ring again.
1572         */
1573
1574        if (err)
1575                rq_work_done = rq_work_to_do;
1576        if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1577                /* Call the function which refreshes the intr coalescing timer
1578                 * value based on the traffic.
1579                 */
1580                enic_calc_int_moderation(enic, &enic->rq[0]);
1581
1582        if ((rq_work_done < budget) && napi_complete_done(napi, rq_work_done)) {
1583
1584                /* Some work done, but not enough to stay in polling,
1585                 * exit polling
1586                 */
1587
1588                if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1589                        enic_set_int_moderation(enic, &enic->rq[0]);
1590                vnic_intr_unmask(&enic->intr[intr]);
1591        }
1592
1593        return rq_work_done;
1594}
1595
1596#ifdef CONFIG_RFS_ACCEL
1597static void enic_free_rx_cpu_rmap(struct enic *enic)
1598{
1599        free_irq_cpu_rmap(enic->netdev->rx_cpu_rmap);
1600        enic->netdev->rx_cpu_rmap = NULL;
1601}
1602
1603static void enic_set_rx_cpu_rmap(struct enic *enic)
1604{
1605        int i, res;
1606
1607        if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX) {
1608                enic->netdev->rx_cpu_rmap = alloc_irq_cpu_rmap(enic->rq_count);
1609                if (unlikely(!enic->netdev->rx_cpu_rmap))
1610                        return;
1611                for (i = 0; i < enic->rq_count; i++) {
1612                        res = irq_cpu_rmap_add(enic->netdev->rx_cpu_rmap,
1613                                               enic->msix_entry[i].vector);
1614                        if (unlikely(res)) {
1615                                enic_free_rx_cpu_rmap(enic);
1616                                return;
1617                        }
1618                }
1619        }
1620}
1621
1622#else
1623
1624static void enic_free_rx_cpu_rmap(struct enic *enic)
1625{
1626}
1627
1628static void enic_set_rx_cpu_rmap(struct enic *enic)
1629{
1630}
1631
1632#endif /* CONFIG_RFS_ACCEL */
1633
1634static int enic_poll_msix_wq(struct napi_struct *napi, int budget)
1635{
1636        struct net_device *netdev = napi->dev;
1637        struct enic *enic = netdev_priv(netdev);
1638        unsigned int wq_index = (napi - &enic->napi[0]) - enic->rq_count;
1639        struct vnic_wq *wq = &enic->wq[wq_index];
1640        unsigned int cq;
1641        unsigned int intr;
1642        unsigned int wq_work_to_do = ENIC_WQ_NAPI_BUDGET;
1643        unsigned int wq_work_done;
1644        unsigned int wq_irq;
1645
1646        wq_irq = wq->index;
1647        cq = enic_cq_wq(enic, wq_irq);
1648        intr = enic_msix_wq_intr(enic, wq_irq);
1649        wq_work_done = vnic_cq_service(&enic->cq[cq], wq_work_to_do,
1650                                       enic_wq_service, NULL);
1651
1652        vnic_intr_return_credits(&enic->intr[intr], wq_work_done,
1653                                 0 /* don't unmask intr */,
1654                                 1 /* reset intr timer */);
1655        if (!wq_work_done) {
1656                napi_complete(napi);
1657                vnic_intr_unmask(&enic->intr[intr]);
1658                return 0;
1659        }
1660
1661        return budget;
1662}
1663
1664static int enic_poll_msix_rq(struct napi_struct *napi, int budget)
1665{
1666        struct net_device *netdev = napi->dev;
1667        struct enic *enic = netdev_priv(netdev);
1668        unsigned int rq = (napi - &enic->napi[0]);
1669        unsigned int cq = enic_cq_rq(enic, rq);
1670        unsigned int intr = enic_msix_rq_intr(enic, rq);
1671        unsigned int work_to_do = budget;
1672        unsigned int work_done = 0;
1673        int err;
1674
1675        /* Service RQ
1676         */
1677
1678        if (budget > 0)
1679                work_done = vnic_cq_service(&enic->cq[cq],
1680                        work_to_do, enic_rq_service, NULL);
1681
1682        /* Return intr event credits for this polling
1683         * cycle.  An intr event is the completion of a
1684         * RQ packet.
1685         */
1686
1687        if (work_done > 0)
1688                vnic_intr_return_credits(&enic->intr[intr],
1689                        work_done,
1690                        0 /* don't unmask intr */,
1691                        0 /* don't reset intr timer */);
1692
1693        err = vnic_rq_fill(&enic->rq[rq], enic_rq_alloc_buf);
1694
1695        /* Buffer allocation failed. Stay in polling mode
1696         * so we can try to fill the ring again.
1697         */
1698
1699        if (err)
1700                work_done = work_to_do;
1701        if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1702                /* Call the function which refreshes the intr coalescing timer
1703                 * value based on the traffic.
1704                 */
1705                enic_calc_int_moderation(enic, &enic->rq[rq]);
1706
1707        if ((work_done < budget) && napi_complete_done(napi, work_done)) {
1708
1709                /* Some work done, but not enough to stay in polling,
1710                 * exit polling
1711                 */
1712
1713                if (enic->rx_coalesce_setting.use_adaptive_rx_coalesce)
1714                        enic_set_int_moderation(enic, &enic->rq[rq]);
1715                vnic_intr_unmask(&enic->intr[intr]);
1716        }
1717
1718        return work_done;
1719}
1720
1721static void enic_notify_timer(struct timer_list *t)
1722{
1723        struct enic *enic = from_timer(enic, t, notify_timer);
1724
1725        enic_notify_check(enic);
1726
1727        mod_timer(&enic->notify_timer,
1728                round_jiffies(jiffies + ENIC_NOTIFY_TIMER_PERIOD));
1729}
1730
1731static void enic_free_intr(struct enic *enic)
1732{
1733        struct net_device *netdev = enic->netdev;
1734        unsigned int i;
1735
1736        enic_free_rx_cpu_rmap(enic);
1737        switch (vnic_dev_get_intr_mode(enic->vdev)) {
1738        case VNIC_DEV_INTR_MODE_INTX:
1739                free_irq(enic->pdev->irq, netdev);
1740                break;
1741        case VNIC_DEV_INTR_MODE_MSI:
1742                free_irq(enic->pdev->irq, enic);
1743                break;
1744        case VNIC_DEV_INTR_MODE_MSIX:
1745                for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1746                        if (enic->msix[i].requested)
1747                                free_irq(enic->msix_entry[i].vector,
1748                                        enic->msix[i].devid);
1749                break;
1750        default:
1751                break;
1752        }
1753}
1754
1755static int enic_request_intr(struct enic *enic)
1756{
1757        struct net_device *netdev = enic->netdev;
1758        unsigned int i, intr;
1759        int err = 0;
1760
1761        enic_set_rx_cpu_rmap(enic);
1762        switch (vnic_dev_get_intr_mode(enic->vdev)) {
1763
1764        case VNIC_DEV_INTR_MODE_INTX:
1765
1766                err = request_irq(enic->pdev->irq, enic_isr_legacy,
1767                        IRQF_SHARED, netdev->name, netdev);
1768                break;
1769
1770        case VNIC_DEV_INTR_MODE_MSI:
1771
1772                err = request_irq(enic->pdev->irq, enic_isr_msi,
1773                        0, netdev->name, enic);
1774                break;
1775
1776        case VNIC_DEV_INTR_MODE_MSIX:
1777
1778                for (i = 0; i < enic->rq_count; i++) {
1779                        intr = enic_msix_rq_intr(enic, i);
1780                        snprintf(enic->msix[intr].devname,
1781                                sizeof(enic->msix[intr].devname),
1782                                "%s-rx-%u", netdev->name, i);
1783                        enic->msix[intr].isr = enic_isr_msix;
1784                        enic->msix[intr].devid = &enic->napi[i];
1785                }
1786
1787                for (i = 0; i < enic->wq_count; i++) {
1788                        int wq = enic_cq_wq(enic, i);
1789
1790                        intr = enic_msix_wq_intr(enic, i);
1791                        snprintf(enic->msix[intr].devname,
1792                                sizeof(enic->msix[intr].devname),
1793                                "%s-tx-%u", netdev->name, i);
1794                        enic->msix[intr].isr = enic_isr_msix;
1795                        enic->msix[intr].devid = &enic->napi[wq];
1796                }
1797
1798                intr = enic_msix_err_intr(enic);
1799                snprintf(enic->msix[intr].devname,
1800                        sizeof(enic->msix[intr].devname),
1801                        "%s-err", netdev->name);
1802                enic->msix[intr].isr = enic_isr_msix_err;
1803                enic->msix[intr].devid = enic;
1804
1805                intr = enic_msix_notify_intr(enic);
1806                snprintf(enic->msix[intr].devname,
1807                        sizeof(enic->msix[intr].devname),
1808                        "%s-notify", netdev->name);
1809                enic->msix[intr].isr = enic_isr_msix_notify;
1810                enic->msix[intr].devid = enic;
1811
1812                for (i = 0; i < ARRAY_SIZE(enic->msix); i++)
1813                        enic->msix[i].requested = 0;
1814
1815                for (i = 0; i < enic->intr_count; i++) {
1816                        err = request_irq(enic->msix_entry[i].vector,
1817                                enic->msix[i].isr, 0,
1818                                enic->msix[i].devname,
1819                                enic->msix[i].devid);
1820                        if (err) {
1821                                enic_free_intr(enic);
1822                                break;
1823                        }
1824                        enic->msix[i].requested = 1;
1825                }
1826
1827                break;
1828
1829        default:
1830                break;
1831        }
1832
1833        return err;
1834}
1835
1836static void enic_synchronize_irqs(struct enic *enic)
1837{
1838        unsigned int i;
1839
1840        switch (vnic_dev_get_intr_mode(enic->vdev)) {
1841        case VNIC_DEV_INTR_MODE_INTX:
1842        case VNIC_DEV_INTR_MODE_MSI:
1843                synchronize_irq(enic->pdev->irq);
1844                break;
1845        case VNIC_DEV_INTR_MODE_MSIX:
1846                for (i = 0; i < enic->intr_count; i++)
1847                        synchronize_irq(enic->msix_entry[i].vector);
1848                break;
1849        default:
1850                break;
1851        }
1852}
1853
1854static void enic_set_rx_coal_setting(struct enic *enic)
1855{
1856        unsigned int speed;
1857        int index = -1;
1858        struct enic_rx_coal *rx_coal = &enic->rx_coalesce_setting;
1859
1860        /* 1. Read the link speed from fw
1861         * 2. Pick the default range for the speed
1862         * 3. Update it in enic->rx_coalesce_setting
1863         */
1864        speed = vnic_dev_port_speed(enic->vdev);
1865        if (ENIC_LINK_SPEED_10G < speed)
1866                index = ENIC_LINK_40G_INDEX;
1867        else if (ENIC_LINK_SPEED_4G < speed)
1868                index = ENIC_LINK_10G_INDEX;
1869        else
1870                index = ENIC_LINK_4G_INDEX;
1871
1872        rx_coal->small_pkt_range_start = mod_range[index].small_pkt_range_start;
1873        rx_coal->large_pkt_range_start = mod_range[index].large_pkt_range_start;
1874        rx_coal->range_end = ENIC_RX_COALESCE_RANGE_END;
1875
1876        /* Start with the value provided by UCSM */
1877        for (index = 0; index < enic->rq_count; index++)
1878                enic->cq[index].cur_rx_coal_timeval =
1879                                enic->config.intr_timer_usec;
1880
1881        rx_coal->use_adaptive_rx_coalesce = 1;
1882}
1883
1884static int enic_dev_notify_set(struct enic *enic)
1885{
1886        int err;
1887
1888        spin_lock_bh(&enic->devcmd_lock);
1889        switch (vnic_dev_get_intr_mode(enic->vdev)) {
1890        case VNIC_DEV_INTR_MODE_INTX:
1891                err = vnic_dev_notify_set(enic->vdev,
1892                        enic_legacy_notify_intr());
1893                break;
1894        case VNIC_DEV_INTR_MODE_MSIX:
1895                err = vnic_dev_notify_set(enic->vdev,
1896                        enic_msix_notify_intr(enic));
1897                break;
1898        default:
1899                err = vnic_dev_notify_set(enic->vdev, -1 /* no intr */);
1900                break;
1901        }
1902        spin_unlock_bh(&enic->devcmd_lock);
1903
1904        return err;
1905}
1906
1907static void enic_notify_timer_start(struct enic *enic)
1908{
1909        switch (vnic_dev_get_intr_mode(enic->vdev)) {
1910        case VNIC_DEV_INTR_MODE_MSI:
1911                mod_timer(&enic->notify_timer, jiffies);
1912                break;
1913        default:
1914                /* Using intr for notification for INTx/MSI-X */
1915                break;
1916        }
1917}
1918
1919/* rtnl lock is held, process context */
1920static int enic_open(struct net_device *netdev)
1921{
1922        struct enic *enic = netdev_priv(netdev);
1923        unsigned int i;
1924        int err, ret;
1925
1926        err = enic_request_intr(enic);
1927        if (err) {
1928                netdev_err(netdev, "Unable to request irq.\n");
1929                return err;
1930        }
1931        enic_init_affinity_hint(enic);
1932        enic_set_affinity_hint(enic);
1933
1934        err = enic_dev_notify_set(enic);
1935        if (err) {
1936                netdev_err(netdev,
1937                        "Failed to alloc notify buffer, aborting.\n");
1938                goto err_out_free_intr;
1939        }
1940
1941        for (i = 0; i < enic->rq_count; i++) {
1942                /* enable rq before updating rq desc */
1943                vnic_rq_enable(&enic->rq[i]);
1944                vnic_rq_fill(&enic->rq[i], enic_rq_alloc_buf);
1945                /* Need at least one buffer on ring to get going */
1946                if (vnic_rq_desc_used(&enic->rq[i]) == 0) {
1947                        netdev_err(netdev, "Unable to alloc receive buffers\n");
1948                        err = -ENOMEM;
1949                        goto err_out_free_rq;
1950                }
1951        }
1952
1953        for (i = 0; i < enic->wq_count; i++)
1954                vnic_wq_enable(&enic->wq[i]);
1955
1956        if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
1957                enic_dev_add_station_addr(enic);
1958
1959        enic_set_rx_mode(netdev);
1960
1961        netif_tx_wake_all_queues(netdev);
1962
1963        for (i = 0; i < enic->rq_count; i++)
1964                napi_enable(&enic->napi[i]);
1965
1966        if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
1967                for (i = 0; i < enic->wq_count; i++)
1968                        napi_enable(&enic->napi[enic_cq_wq(enic, i)]);
1969        enic_dev_enable(enic);
1970
1971        for (i = 0; i < enic->intr_count; i++)
1972                vnic_intr_unmask(&enic->intr[i]);
1973
1974        enic_notify_timer_start(enic);
1975        enic_rfs_timer_start(enic);
1976
1977        return 0;
1978
1979err_out_free_rq:
1980        for (i = 0; i < enic->rq_count; i++) {
1981                ret = vnic_rq_disable(&enic->rq[i]);
1982                if (!ret)
1983                        vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
1984        }
1985        enic_dev_notify_unset(enic);
1986err_out_free_intr:
1987        enic_unset_affinity_hint(enic);
1988        enic_free_intr(enic);
1989
1990        return err;
1991}
1992
1993/* rtnl lock is held, process context */
1994static int enic_stop(struct net_device *netdev)
1995{
1996        struct enic *enic = netdev_priv(netdev);
1997        unsigned int i;
1998        int err;
1999
2000        for (i = 0; i < enic->intr_count; i++) {
2001                vnic_intr_mask(&enic->intr[i]);
2002                (void)vnic_intr_masked(&enic->intr[i]); /* flush write */
2003        }
2004
2005        enic_synchronize_irqs(enic);
2006
2007        del_timer_sync(&enic->notify_timer);
2008        enic_rfs_flw_tbl_free(enic);
2009
2010        enic_dev_disable(enic);
2011
2012        for (i = 0; i < enic->rq_count; i++)
2013                napi_disable(&enic->napi[i]);
2014
2015        netif_carrier_off(netdev);
2016        if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
2017                for (i = 0; i < enic->wq_count; i++)
2018                        napi_disable(&enic->napi[enic_cq_wq(enic, i)]);
2019        netif_tx_disable(netdev);
2020
2021        if (!enic_is_dynamic(enic) && !enic_is_sriov_vf(enic))
2022                enic_dev_del_station_addr(enic);
2023
2024        for (i = 0; i < enic->wq_count; i++) {
2025                err = vnic_wq_disable(&enic->wq[i]);
2026                if (err)
2027                        return err;
2028        }
2029        for (i = 0; i < enic->rq_count; i++) {
2030                err = vnic_rq_disable(&enic->rq[i]);
2031                if (err)
2032                        return err;
2033        }
2034
2035        enic_dev_notify_unset(enic);
2036        enic_unset_affinity_hint(enic);
2037        enic_free_intr(enic);
2038
2039        for (i = 0; i < enic->wq_count; i++)
2040                vnic_wq_clean(&enic->wq[i], enic_free_wq_buf);
2041        for (i = 0; i < enic->rq_count; i++)
2042                vnic_rq_clean(&enic->rq[i], enic_free_rq_buf);
2043        for (i = 0; i < enic->cq_count; i++)
2044                vnic_cq_clean(&enic->cq[i]);
2045        for (i = 0; i < enic->intr_count; i++)
2046                vnic_intr_clean(&enic->intr[i]);
2047
2048        return 0;
2049}
2050
2051static int _enic_change_mtu(struct net_device *netdev, int new_mtu)
2052{
2053        bool running = netif_running(netdev);
2054        int err = 0;
2055
2056        ASSERT_RTNL();
2057        if (running) {
2058                err = enic_stop(netdev);
2059                if (err)
2060                        return err;
2061        }
2062
2063        netdev->mtu = new_mtu;
2064
2065        if (running) {
2066                err = enic_open(netdev);
2067                if (err)
2068                        return err;
2069        }
2070
2071        return 0;
2072}
2073
2074static int enic_change_mtu(struct net_device *netdev, int new_mtu)
2075{
2076        struct enic *enic = netdev_priv(netdev);
2077
2078        if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
2079                return -EOPNOTSUPP;
2080
2081        if (netdev->mtu > enic->port_mtu)
2082                netdev_warn(netdev,
2083                            "interface MTU (%d) set higher than port MTU (%d)\n",
2084                            netdev->mtu, enic->port_mtu);
2085
2086        return _enic_change_mtu(netdev, new_mtu);
2087}
2088
2089static void enic_change_mtu_work(struct work_struct *work)
2090{
2091        struct enic *enic = container_of(work, struct enic, change_mtu_work);
2092        struct net_device *netdev = enic->netdev;
2093        int new_mtu = vnic_dev_mtu(enic->vdev);
2094
2095        rtnl_lock();
2096        (void)_enic_change_mtu(netdev, new_mtu);
2097        rtnl_unlock();
2098
2099        netdev_info(netdev, "interface MTU set as %d\n", netdev->mtu);
2100}
2101
2102#ifdef CONFIG_NET_POLL_CONTROLLER
2103static void enic_poll_controller(struct net_device *netdev)
2104{
2105        struct enic *enic = netdev_priv(netdev);
2106        struct vnic_dev *vdev = enic->vdev;
2107        unsigned int i, intr;
2108
2109        switch (vnic_dev_get_intr_mode(vdev)) {
2110        case VNIC_DEV_INTR_MODE_MSIX:
2111                for (i = 0; i < enic->rq_count; i++) {
2112                        intr = enic_msix_rq_intr(enic, i);
2113                        enic_isr_msix(enic->msix_entry[intr].vector,
2114                                      &enic->napi[i]);
2115                }
2116
2117                for (i = 0; i < enic->wq_count; i++) {
2118                        intr = enic_msix_wq_intr(enic, i);
2119                        enic_isr_msix(enic->msix_entry[intr].vector,
2120                                      &enic->napi[enic_cq_wq(enic, i)]);
2121                }
2122
2123                break;
2124        case VNIC_DEV_INTR_MODE_MSI:
2125                enic_isr_msi(enic->pdev->irq, enic);
2126                break;
2127        case VNIC_DEV_INTR_MODE_INTX:
2128                enic_isr_legacy(enic->pdev->irq, netdev);
2129                break;
2130        default:
2131                break;
2132        }
2133}
2134#endif
2135
2136static int enic_dev_wait(struct vnic_dev *vdev,
2137        int (*start)(struct vnic_dev *, int),
2138        int (*finished)(struct vnic_dev *, int *),
2139        int arg)
2140{
2141        unsigned long time;
2142        int done;
2143        int err;
2144
2145        BUG_ON(in_interrupt());
2146
2147        err = start(vdev, arg);
2148        if (err)
2149                return err;
2150
2151        /* Wait for func to complete...2 seconds max
2152         */
2153
2154        time = jiffies + (HZ * 2);
2155        do {
2156
2157                err = finished(vdev, &done);
2158                if (err)
2159                        return err;
2160
2161                if (done)
2162                        return 0;
2163
2164                schedule_timeout_uninterruptible(HZ / 10);
2165
2166        } while (time_after(time, jiffies));
2167
2168        return -ETIMEDOUT;
2169}
2170
2171static int enic_dev_open(struct enic *enic)
2172{
2173        int err;
2174        u32 flags = CMD_OPENF_IG_DESCCACHE;
2175
2176        err = enic_dev_wait(enic->vdev, vnic_dev_open,
2177                vnic_dev_open_done, flags);
2178        if (err)
2179                dev_err(enic_get_dev(enic), "vNIC device open failed, err %d\n",
2180                        err);
2181
2182        return err;
2183}
2184
2185static int enic_dev_soft_reset(struct enic *enic)
2186{
2187        int err;
2188
2189        err = enic_dev_wait(enic->vdev, vnic_dev_soft_reset,
2190                            vnic_dev_soft_reset_done, 0);
2191        if (err)
2192                netdev_err(enic->netdev, "vNIC soft reset failed, err %d\n",
2193                           err);
2194
2195        return err;
2196}
2197
2198static int enic_dev_hang_reset(struct enic *enic)
2199{
2200        int err;
2201
2202        err = enic_dev_wait(enic->vdev, vnic_dev_hang_reset,
2203                vnic_dev_hang_reset_done, 0);
2204        if (err)
2205                netdev_err(enic->netdev, "vNIC hang reset failed, err %d\n",
2206                        err);
2207
2208        return err;
2209}
2210
2211int __enic_set_rsskey(struct enic *enic)
2212{
2213        union vnic_rss_key *rss_key_buf_va;
2214        dma_addr_t rss_key_buf_pa;
2215        int i, kidx, bidx, err;
2216
2217        rss_key_buf_va = pci_zalloc_consistent(enic->pdev,
2218                                               sizeof(union vnic_rss_key),
2219                                               &rss_key_buf_pa);
2220        if (!rss_key_buf_va)
2221                return -ENOMEM;
2222
2223        for (i = 0; i < ENIC_RSS_LEN; i++) {
2224                kidx = i / ENIC_RSS_BYTES_PER_KEY;
2225                bidx = i % ENIC_RSS_BYTES_PER_KEY;
2226                rss_key_buf_va->key[kidx].b[bidx] = enic->rss_key[i];
2227        }
2228        spin_lock_bh(&enic->devcmd_lock);
2229        err = enic_set_rss_key(enic,
2230                rss_key_buf_pa,
2231                sizeof(union vnic_rss_key));
2232        spin_unlock_bh(&enic->devcmd_lock);
2233
2234        pci_free_consistent(enic->pdev, sizeof(union vnic_rss_key),
2235                rss_key_buf_va, rss_key_buf_pa);
2236
2237        return err;
2238}
2239
2240static int enic_set_rsskey(struct enic *enic)
2241{
2242        netdev_rss_key_fill(enic->rss_key, ENIC_RSS_LEN);
2243
2244        return __enic_set_rsskey(enic);
2245}
2246
2247static int enic_set_rsscpu(struct enic *enic, u8 rss_hash_bits)
2248{
2249        dma_addr_t rss_cpu_buf_pa;
2250        union vnic_rss_cpu *rss_cpu_buf_va = NULL;
2251        unsigned int i;
2252        int err;
2253
2254        rss_cpu_buf_va = pci_alloc_consistent(enic->pdev,
2255                sizeof(union vnic_rss_cpu), &rss_cpu_buf_pa);
2256        if (!rss_cpu_buf_va)
2257                return -ENOMEM;
2258
2259        for (i = 0; i < (1 << rss_hash_bits); i++)
2260                (*rss_cpu_buf_va).cpu[i/4].b[i%4] = i % enic->rq_count;
2261
2262        spin_lock_bh(&enic->devcmd_lock);
2263        err = enic_set_rss_cpu(enic,
2264                rss_cpu_buf_pa,
2265                sizeof(union vnic_rss_cpu));
2266        spin_unlock_bh(&enic->devcmd_lock);
2267
2268        pci_free_consistent(enic->pdev, sizeof(union vnic_rss_cpu),
2269                rss_cpu_buf_va, rss_cpu_buf_pa);
2270
2271        return err;
2272}
2273
2274static int enic_set_niccfg(struct enic *enic, u8 rss_default_cpu,
2275        u8 rss_hash_type, u8 rss_hash_bits, u8 rss_base_cpu, u8 rss_enable)
2276{
2277        const u8 tso_ipid_split_en = 0;
2278        const u8 ig_vlan_strip_en = 1;
2279        int err;
2280
2281        /* Enable VLAN tag stripping.
2282        */
2283
2284        spin_lock_bh(&enic->devcmd_lock);
2285        err = enic_set_nic_cfg(enic,
2286                rss_default_cpu, rss_hash_type,
2287                rss_hash_bits, rss_base_cpu,
2288                rss_enable, tso_ipid_split_en,
2289                ig_vlan_strip_en);
2290        spin_unlock_bh(&enic->devcmd_lock);
2291
2292        return err;
2293}
2294
2295static int enic_set_rss_nic_cfg(struct enic *enic)
2296{
2297        struct device *dev = enic_get_dev(enic);
2298        const u8 rss_default_cpu = 0;
2299        const u8 rss_hash_bits = 7;
2300        const u8 rss_base_cpu = 0;
2301        u8 rss_hash_type;
2302        int res;
2303        u8 rss_enable = ENIC_SETTING(enic, RSS) && (enic->rq_count > 1);
2304
2305        spin_lock_bh(&enic->devcmd_lock);
2306        res = vnic_dev_capable_rss_hash_type(enic->vdev, &rss_hash_type);
2307        spin_unlock_bh(&enic->devcmd_lock);
2308        if (res) {
2309                /* defaults for old adapters
2310                 */
2311                rss_hash_type = NIC_CFG_RSS_HASH_TYPE_IPV4      |
2312                                NIC_CFG_RSS_HASH_TYPE_TCP_IPV4  |
2313                                NIC_CFG_RSS_HASH_TYPE_IPV6      |
2314                                NIC_CFG_RSS_HASH_TYPE_TCP_IPV6;
2315        }
2316
2317        if (rss_enable) {
2318                if (!enic_set_rsskey(enic)) {
2319                        if (enic_set_rsscpu(enic, rss_hash_bits)) {
2320                                rss_enable = 0;
2321                                dev_warn(dev, "RSS disabled, "
2322                                        "Failed to set RSS cpu indirection table.");
2323                        }
2324                } else {
2325                        rss_enable = 0;
2326                        dev_warn(dev, "RSS disabled, Failed to set RSS key.\n");
2327                }
2328        }
2329
2330        return enic_set_niccfg(enic, rss_default_cpu, rss_hash_type,
2331                rss_hash_bits, rss_base_cpu, rss_enable);
2332}
2333
2334static void enic_reset(struct work_struct *work)
2335{
2336        struct enic *enic = container_of(work, struct enic, reset);
2337
2338        if (!netif_running(enic->netdev))
2339                return;
2340
2341        rtnl_lock();
2342
2343        spin_lock(&enic->enic_api_lock);
2344        enic_stop(enic->netdev);
2345        enic_dev_soft_reset(enic);
2346        enic_reset_addr_lists(enic);
2347        enic_init_vnic_resources(enic);
2348        enic_set_rss_nic_cfg(enic);
2349        enic_dev_set_ig_vlan_rewrite_mode(enic);
2350        enic_open(enic->netdev);
2351        spin_unlock(&enic->enic_api_lock);
2352        call_netdevice_notifiers(NETDEV_REBOOT, enic->netdev);
2353
2354        rtnl_unlock();
2355}
2356
2357static void enic_tx_hang_reset(struct work_struct *work)
2358{
2359        struct enic *enic = container_of(work, struct enic, tx_hang_reset);
2360
2361        rtnl_lock();
2362
2363        spin_lock(&enic->enic_api_lock);
2364        enic_dev_hang_notify(enic);
2365        enic_stop(enic->netdev);
2366        enic_dev_hang_reset(enic);
2367        enic_reset_addr_lists(enic);
2368        enic_init_vnic_resources(enic);
2369        enic_set_rss_nic_cfg(enic);
2370        enic_dev_set_ig_vlan_rewrite_mode(enic);
2371        enic_open(enic->netdev);
2372        spin_unlock(&enic->enic_api_lock);
2373        call_netdevice_notifiers(NETDEV_REBOOT, enic->netdev);
2374
2375        rtnl_unlock();
2376}
2377
2378static int enic_set_intr_mode(struct enic *enic)
2379{
2380        unsigned int n = min_t(unsigned int, enic->rq_count, ENIC_RQ_MAX);
2381        unsigned int m = min_t(unsigned int, enic->wq_count, ENIC_WQ_MAX);
2382        unsigned int i;
2383
2384        /* Set interrupt mode (INTx, MSI, MSI-X) depending
2385         * on system capabilities.
2386         *
2387         * Try MSI-X first
2388         *
2389         * We need n RQs, m WQs, n+m CQs, and n+m+2 INTRs
2390         * (the second to last INTR is used for WQ/RQ errors)
2391         * (the last INTR is used for notifications)
2392         */
2393
2394        BUG_ON(ARRAY_SIZE(enic->msix_entry) < n + m + 2);
2395        for (i = 0; i < n + m + 2; i++)
2396                enic->msix_entry[i].entry = i;
2397
2398        /* Use multiple RQs if RSS is enabled
2399         */
2400
2401        if (ENIC_SETTING(enic, RSS) &&
2402            enic->config.intr_mode < 1 &&
2403            enic->rq_count >= n &&
2404            enic->wq_count >= m &&
2405            enic->cq_count >= n + m &&
2406            enic->intr_count >= n + m + 2) {
2407
2408                if (pci_enable_msix_range(enic->pdev, enic->msix_entry,
2409                                          n + m + 2, n + m + 2) > 0) {
2410
2411                        enic->rq_count = n;
2412                        enic->wq_count = m;
2413                        enic->cq_count = n + m;
2414                        enic->intr_count = n + m + 2;
2415
2416                        vnic_dev_set_intr_mode(enic->vdev,
2417                                VNIC_DEV_INTR_MODE_MSIX);
2418
2419                        return 0;
2420                }
2421        }
2422
2423        if (enic->config.intr_mode < 1 &&
2424            enic->rq_count >= 1 &&
2425            enic->wq_count >= m &&
2426            enic->cq_count >= 1 + m &&
2427            enic->intr_count >= 1 + m + 2) {
2428                if (pci_enable_msix_range(enic->pdev, enic->msix_entry,
2429                                          1 + m + 2, 1 + m + 2) > 0) {
2430
2431                        enic->rq_count = 1;
2432                        enic->wq_count = m;
2433                        enic->cq_count = 1 + m;
2434                        enic->intr_count = 1 + m + 2;
2435
2436                        vnic_dev_set_intr_mode(enic->vdev,
2437                                VNIC_DEV_INTR_MODE_MSIX);
2438
2439                        return 0;
2440                }
2441        }
2442
2443        /* Next try MSI
2444         *
2445         * We need 1 RQ, 1 WQ, 2 CQs, and 1 INTR
2446         */
2447
2448        if (enic->config.intr_mode < 2 &&
2449            enic->rq_count >= 1 &&
2450            enic->wq_count >= 1 &&
2451            enic->cq_count >= 2 &&
2452            enic->intr_count >= 1 &&
2453            !pci_enable_msi(enic->pdev)) {
2454
2455                enic->rq_count = 1;
2456                enic->wq_count = 1;
2457                enic->cq_count = 2;
2458                enic->intr_count = 1;
2459
2460                vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_MSI);
2461
2462                return 0;
2463        }
2464
2465        /* Next try INTx
2466         *
2467         * We need 1 RQ, 1 WQ, 2 CQs, and 3 INTRs
2468         * (the first INTR is used for WQ/RQ)
2469         * (the second INTR is used for WQ/RQ errors)
2470         * (the last INTR is used for notifications)
2471         */
2472
2473        if (enic->config.intr_mode < 3 &&
2474            enic->rq_count >= 1 &&
2475            enic->wq_count >= 1 &&
2476            enic->cq_count >= 2 &&
2477            enic->intr_count >= 3) {
2478
2479                enic->rq_count = 1;
2480                enic->wq_count = 1;
2481                enic->cq_count = 2;
2482                enic->intr_count = 3;
2483
2484                vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_INTX);
2485
2486                return 0;
2487        }
2488
2489        vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2490
2491        return -EINVAL;
2492}
2493
2494static void enic_clear_intr_mode(struct enic *enic)
2495{
2496        switch (vnic_dev_get_intr_mode(enic->vdev)) {
2497        case VNIC_DEV_INTR_MODE_MSIX:
2498                pci_disable_msix(enic->pdev);
2499                break;
2500        case VNIC_DEV_INTR_MODE_MSI:
2501                pci_disable_msi(enic->pdev);
2502                break;
2503        default:
2504                break;
2505        }
2506
2507        vnic_dev_set_intr_mode(enic->vdev, VNIC_DEV_INTR_MODE_UNKNOWN);
2508}
2509
2510static const struct net_device_ops enic_netdev_dynamic_ops = {
2511        .ndo_open               = enic_open,
2512        .ndo_stop               = enic_stop,
2513        .ndo_start_xmit         = enic_hard_start_xmit,
2514        .ndo_get_stats64        = enic_get_stats,
2515        .ndo_validate_addr      = eth_validate_addr,
2516        .ndo_set_rx_mode        = enic_set_rx_mode,
2517        .ndo_set_mac_address    = enic_set_mac_address_dynamic,
2518        .ndo_change_mtu         = enic_change_mtu,
2519        .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
2520        .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
2521        .ndo_tx_timeout         = enic_tx_timeout,
2522        .ndo_set_vf_port        = enic_set_vf_port,
2523        .ndo_get_vf_port        = enic_get_vf_port,
2524        .ndo_set_vf_mac         = enic_set_vf_mac,
2525#ifdef CONFIG_NET_POLL_CONTROLLER
2526        .ndo_poll_controller    = enic_poll_controller,
2527#endif
2528#ifdef CONFIG_RFS_ACCEL
2529        .ndo_rx_flow_steer      = enic_rx_flow_steer,
2530#endif
2531        .ndo_udp_tunnel_add     = enic_udp_tunnel_add,
2532        .ndo_udp_tunnel_del     = enic_udp_tunnel_del,
2533        .ndo_features_check     = enic_features_check,
2534};
2535
2536static const struct net_device_ops enic_netdev_ops = {
2537        .ndo_open               = enic_open,
2538        .ndo_stop               = enic_stop,
2539        .ndo_start_xmit         = enic_hard_start_xmit,
2540        .ndo_get_stats64        = enic_get_stats,
2541        .ndo_validate_addr      = eth_validate_addr,
2542        .ndo_set_mac_address    = enic_set_mac_address,
2543        .ndo_set_rx_mode        = enic_set_rx_mode,
2544        .ndo_change_mtu         = enic_change_mtu,
2545        .ndo_vlan_rx_add_vid    = enic_vlan_rx_add_vid,
2546        .ndo_vlan_rx_kill_vid   = enic_vlan_rx_kill_vid,
2547        .ndo_tx_timeout         = enic_tx_timeout,
2548        .ndo_set_vf_port        = enic_set_vf_port,
2549        .ndo_get_vf_port        = enic_get_vf_port,
2550        .ndo_set_vf_mac         = enic_set_vf_mac,
2551#ifdef CONFIG_NET_POLL_CONTROLLER
2552        .ndo_poll_controller    = enic_poll_controller,
2553#endif
2554#ifdef CONFIG_RFS_ACCEL
2555        .ndo_rx_flow_steer      = enic_rx_flow_steer,
2556#endif
2557        .ndo_udp_tunnel_add     = enic_udp_tunnel_add,
2558        .ndo_udp_tunnel_del     = enic_udp_tunnel_del,
2559        .ndo_features_check     = enic_features_check,
2560};
2561
2562static void enic_dev_deinit(struct enic *enic)
2563{
2564        unsigned int i;
2565
2566        for (i = 0; i < enic->rq_count; i++)
2567                __netif_napi_del(&enic->napi[i]);
2568
2569        if (vnic_dev_get_intr_mode(enic->vdev) == VNIC_DEV_INTR_MODE_MSIX)
2570                for (i = 0; i < enic->wq_count; i++)
2571                        __netif_napi_del(&enic->napi[enic_cq_wq(enic, i)]);
2572
2573        /* observe RCU grace period after __netif_napi_del() calls */
2574        synchronize_net();
2575
2576        enic_free_vnic_resources(enic);
2577        enic_clear_intr_mode(enic);
2578        enic_free_affinity_hint(enic);
2579}
2580
2581static void enic_kdump_kernel_config(struct enic *enic)
2582{
2583        if (is_kdump_kernel()) {
2584                dev_info(enic_get_dev(enic), "Running from within kdump kernel. Using minimal resources\n");
2585                enic->rq_count = 1;
2586                enic->wq_count = 1;
2587                enic->config.rq_desc_count = ENIC_MIN_RQ_DESCS;
2588                enic->config.wq_desc_count = ENIC_MIN_WQ_DESCS;
2589                enic->config.mtu = min_t(u16, 1500, enic->config.mtu);
2590        }
2591}
2592
2593static int enic_dev_init(struct enic *enic)
2594{
2595        struct device *dev = enic_get_dev(enic);
2596        struct net_device *netdev = enic->netdev;
2597        unsigned int i;
2598        int err;
2599
2600        /* Get interrupt coalesce timer info */
2601        err = enic_dev_intr_coal_timer_info(enic);
2602        if (err) {
2603                dev_warn(dev, "Using default conversion factor for "
2604                        "interrupt coalesce timer\n");
2605                vnic_dev_intr_coal_timer_info_default(enic->vdev);
2606        }
2607
2608        /* Get vNIC configuration
2609         */
2610
2611        err = enic_get_vnic_config(enic);
2612        if (err) {
2613                dev_err(dev, "Get vNIC configuration failed, aborting\n");
2614                return err;
2615        }
2616
2617        /* Get available resource counts
2618         */
2619
2620        enic_get_res_counts(enic);
2621
2622        /* modify resource count if we are in kdump_kernel
2623         */
2624        enic_kdump_kernel_config(enic);
2625
2626        /* Set interrupt mode based on resource counts and system
2627         * capabilities
2628         */
2629
2630        err = enic_set_intr_mode(enic);
2631        if (err) {
2632                dev_err(dev, "Failed to set intr mode based on resource "
2633                        "counts and system capabilities, aborting\n");
2634                return err;
2635        }
2636
2637        /* Allocate and configure vNIC resources
2638         */
2639
2640        err = enic_alloc_vnic_resources(enic);
2641        if (err) {
2642                dev_err(dev, "Failed to alloc vNIC resources, aborting\n");
2643                goto err_out_free_vnic_resources;
2644        }
2645
2646        enic_init_vnic_resources(enic);
2647
2648        err = enic_set_rss_nic_cfg(enic);
2649        if (err) {
2650                dev_err(dev, "Failed to config nic, aborting\n");
2651                goto err_out_free_vnic_resources;
2652        }
2653
2654        switch (vnic_dev_get_intr_mode(enic->vdev)) {
2655        default:
2656                netif_napi_add(netdev, &enic->napi[0], enic_poll, 64);
2657                break;
2658        case VNIC_DEV_INTR_MODE_MSIX:
2659                for (i = 0; i < enic->rq_count; i++) {
2660                        netif_napi_add(netdev, &enic->napi[i],
2661                                enic_poll_msix_rq, NAPI_POLL_WEIGHT);
2662                }
2663                for (i = 0; i < enic->wq_count; i++)
2664                        netif_napi_add(netdev, &enic->napi[enic_cq_wq(enic, i)],
2665                                       enic_poll_msix_wq, NAPI_POLL_WEIGHT);
2666                break;
2667        }
2668
2669        return 0;
2670
2671err_out_free_vnic_resources:
2672        enic_free_affinity_hint(enic);
2673        enic_clear_intr_mode(enic);
2674        enic_free_vnic_resources(enic);
2675
2676        return err;
2677}
2678
2679static void enic_iounmap(struct enic *enic)
2680{
2681        unsigned int i;
2682
2683        for (i = 0; i < ARRAY_SIZE(enic->bar); i++)
2684                if (enic->bar[i].vaddr)
2685                        iounmap(enic->bar[i].vaddr);
2686}
2687
2688static int enic_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
2689{
2690        struct device *dev = &pdev->dev;
2691        struct net_device *netdev;
2692        struct enic *enic;
2693        int using_dac = 0;
2694        unsigned int i;
2695        int err;
2696#ifdef CONFIG_PCI_IOV
2697        int pos = 0;
2698#endif
2699        int num_pps = 1;
2700
2701        /* Allocate net device structure and initialize.  Private
2702         * instance data is initialized to zero.
2703         */
2704
2705        netdev = alloc_etherdev_mqs(sizeof(struct enic),
2706                                    ENIC_RQ_MAX, ENIC_WQ_MAX);
2707        if (!netdev)
2708                return -ENOMEM;
2709
2710        pci_set_drvdata(pdev, netdev);
2711
2712        SET_NETDEV_DEV(netdev, &pdev->dev);
2713
2714        enic = netdev_priv(netdev);
2715        enic->netdev = netdev;
2716        enic->pdev = pdev;
2717
2718        /* Setup PCI resources
2719         */
2720
2721        err = pci_enable_device_mem(pdev);
2722        if (err) {
2723                dev_err(dev, "Cannot enable PCI device, aborting\n");
2724                goto err_out_free_netdev;
2725        }
2726
2727        err = pci_request_regions(pdev, DRV_NAME);
2728        if (err) {
2729                dev_err(dev, "Cannot request PCI regions, aborting\n");
2730                goto err_out_disable_device;
2731        }
2732
2733        pci_set_master(pdev);
2734
2735        /* Query PCI controller on system for DMA addressing
2736         * limitation for the device.  Try 47-bit first, and
2737         * fail to 32-bit.
2738         */
2739
2740        err = pci_set_dma_mask(pdev, DMA_BIT_MASK(47));
2741        if (err) {
2742                err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
2743                if (err) {
2744                        dev_err(dev, "No usable DMA configuration, aborting\n");
2745                        goto err_out_release_regions;
2746                }
2747                err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
2748                if (err) {
2749                        dev_err(dev, "Unable to obtain %u-bit DMA "
2750                                "for consistent allocations, aborting\n", 32);
2751                        goto err_out_release_regions;
2752                }
2753        } else {
2754                err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(47));
2755                if (err) {
2756                        dev_err(dev, "Unable to obtain %u-bit DMA "
2757                                "for consistent allocations, aborting\n", 47);
2758                        goto err_out_release_regions;
2759                }
2760                using_dac = 1;
2761        }
2762
2763        /* Map vNIC resources from BAR0-5
2764         */
2765
2766        for (i = 0; i < ARRAY_SIZE(enic->bar); i++) {
2767                if (!(pci_resource_flags(pdev, i) & IORESOURCE_MEM))
2768                        continue;
2769                enic->bar[i].len = pci_resource_len(pdev, i);
2770                enic->bar[i].vaddr = pci_iomap(pdev, i, enic->bar[i].len);
2771                if (!enic->bar[i].vaddr) {
2772                        dev_err(dev, "Cannot memory-map BAR %d, aborting\n", i);
2773                        err = -ENODEV;
2774                        goto err_out_iounmap;
2775                }
2776                enic->bar[i].bus_addr = pci_resource_start(pdev, i);
2777        }
2778
2779        /* Register vNIC device
2780         */
2781
2782        enic->vdev = vnic_dev_register(NULL, enic, pdev, enic->bar,
2783                ARRAY_SIZE(enic->bar));
2784        if (!enic->vdev) {
2785                dev_err(dev, "vNIC registration failed, aborting\n");
2786                err = -ENODEV;
2787                goto err_out_iounmap;
2788        }
2789
2790        err = vnic_devcmd_init(enic->vdev);
2791
2792        if (err)
2793                goto err_out_vnic_unregister;
2794
2795#ifdef CONFIG_PCI_IOV
2796        /* Get number of subvnics */
2797        pos = pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_SRIOV);
2798        if (pos) {
2799                pci_read_config_word(pdev, pos + PCI_SRIOV_TOTAL_VF,
2800                        &enic->num_vfs);
2801                if (enic->num_vfs) {
2802                        err = pci_enable_sriov(pdev, enic->num_vfs);
2803                        if (err) {
2804                                dev_err(dev, "SRIOV enable failed, aborting."
2805                                        " pci_enable_sriov() returned %d\n",
2806                                        err);
2807                                goto err_out_vnic_unregister;
2808                        }
2809                        enic->priv_flags |= ENIC_SRIOV_ENABLED;
2810                        num_pps = enic->num_vfs;
2811                }
2812        }
2813#endif
2814
2815        /* Allocate structure for port profiles */
2816        enic->pp = kcalloc(num_pps, sizeof(*enic->pp), GFP_KERNEL);
2817        if (!enic->pp) {
2818                err = -ENOMEM;
2819                goto err_out_disable_sriov_pp;
2820        }
2821
2822        /* Issue device open to get device in known state
2823         */
2824
2825        err = enic_dev_open(enic);
2826        if (err) {
2827                dev_err(dev, "vNIC dev open failed, aborting\n");
2828                goto err_out_disable_sriov;
2829        }
2830
2831        /* Setup devcmd lock
2832         */
2833
2834        spin_lock_init(&enic->devcmd_lock);
2835        spin_lock_init(&enic->enic_api_lock);
2836
2837        /*
2838         * Set ingress vlan rewrite mode before vnic initialization
2839         */
2840
2841        err = enic_dev_set_ig_vlan_rewrite_mode(enic);
2842        if (err) {
2843                dev_err(dev,
2844                        "Failed to set ingress vlan rewrite mode, aborting.\n");
2845                goto err_out_dev_close;
2846        }
2847
2848        /* Issue device init to initialize the vnic-to-switch link.
2849         * We'll start with carrier off and wait for link UP
2850         * notification later to turn on carrier.  We don't need
2851         * to wait here for the vnic-to-switch link initialization
2852         * to complete; link UP notification is the indication that
2853         * the process is complete.
2854         */
2855
2856        netif_carrier_off(netdev);
2857
2858        /* Do not call dev_init for a dynamic vnic.
2859         * For a dynamic vnic, init_prov_info will be
2860         * called later by an upper layer.
2861         */
2862
2863        if (!enic_is_dynamic(enic)) {
2864                err = vnic_dev_init(enic->vdev, 0);
2865                if (err) {
2866                        dev_err(dev, "vNIC dev init failed, aborting\n");
2867                        goto err_out_dev_close;
2868                }
2869        }
2870
2871        err = enic_dev_init(enic);
2872        if (err) {
2873                dev_err(dev, "Device initialization failed, aborting\n");
2874                goto err_out_dev_close;
2875        }
2876
2877        netif_set_real_num_tx_queues(netdev, enic->wq_count);
2878        netif_set_real_num_rx_queues(netdev, enic->rq_count);
2879
2880        /* Setup notification timer, HW reset task, and wq locks
2881         */
2882
2883        timer_setup(&enic->notify_timer, enic_notify_timer, 0);
2884
2885        enic_rfs_flw_tbl_init(enic);
2886        enic_set_rx_coal_setting(enic);
2887        INIT_WORK(&enic->reset, enic_reset);
2888        INIT_WORK(&enic->tx_hang_reset, enic_tx_hang_reset);
2889        INIT_WORK(&enic->change_mtu_work, enic_change_mtu_work);
2890
2891        for (i = 0; i < enic->wq_count; i++)
2892                spin_lock_init(&enic->wq_lock[i]);
2893
2894        /* Register net device
2895         */
2896
2897        enic->port_mtu = enic->config.mtu;
2898
2899        err = enic_set_mac_addr(netdev, enic->mac_addr);
2900        if (err) {
2901                dev_err(dev, "Invalid MAC address, aborting\n");
2902                goto err_out_dev_deinit;
2903        }
2904
2905        enic->tx_coalesce_usecs = enic->config.intr_timer_usec;
2906        /* rx coalesce time already got initialized. This gets used
2907         * if adaptive coal is turned off
2908         */
2909        enic->rx_coalesce_usecs = enic->tx_coalesce_usecs;
2910
2911        if (enic_is_dynamic(enic) || enic_is_sriov_vf(enic))
2912                netdev->netdev_ops = &enic_netdev_dynamic_ops;
2913        else
2914                netdev->netdev_ops = &enic_netdev_ops;
2915
2916        netdev->watchdog_timeo = 2 * HZ;
2917        enic_set_ethtool_ops(netdev);
2918
2919        netdev->features |= NETIF_F_HW_VLAN_CTAG_TX | NETIF_F_HW_VLAN_CTAG_RX;
2920        if (ENIC_SETTING(enic, LOOP)) {
2921                netdev->features &= ~NETIF_F_HW_VLAN_CTAG_TX;
2922                enic->loop_enable = 1;
2923                enic->loop_tag = enic->config.loop_tag;
2924                dev_info(dev, "loopback tag=0x%04x\n", enic->loop_tag);
2925        }
2926        if (ENIC_SETTING(enic, TXCSUM))
2927                netdev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM;
2928        if (ENIC_SETTING(enic, TSO))
2929                netdev->hw_features |= NETIF_F_TSO |
2930                        NETIF_F_TSO6 | NETIF_F_TSO_ECN;
2931        if (ENIC_SETTING(enic, RSS))
2932                netdev->hw_features |= NETIF_F_RXHASH;
2933        if (ENIC_SETTING(enic, RXCSUM))
2934                netdev->hw_features |= NETIF_F_RXCSUM;
2935        if (ENIC_SETTING(enic, VXLAN)) {
2936                u64 patch_level;
2937                u64 a1 = 0;
2938
2939                netdev->hw_enc_features |= NETIF_F_RXCSUM               |
2940                                           NETIF_F_TSO                  |
2941                                           NETIF_F_TSO6                 |
2942                                           NETIF_F_TSO_ECN              |
2943                                           NETIF_F_GSO_UDP_TUNNEL       |
2944                                           NETIF_F_HW_CSUM              |
2945                                           NETIF_F_GSO_UDP_TUNNEL_CSUM;
2946                netdev->hw_features |= netdev->hw_enc_features;
2947                /* get bit mask from hw about supported offload bit level
2948                 * BIT(0) = fw supports patch_level 0
2949                 *          fcoe bit = encap
2950                 *          fcoe_fc_crc_ok = outer csum ok
2951                 * BIT(1) = always set by fw
2952                 * BIT(2) = fw supports patch_level 2
2953                 *          BIT(0) in rss_hash = encap
2954                 *          BIT(1,2) in rss_hash = outer_ip_csum_ok/
2955                 *                                 outer_tcp_csum_ok
2956                 * used in enic_rq_indicate_buf
2957                 */
2958                err = vnic_dev_get_supported_feature_ver(enic->vdev,
2959                                                         VIC_FEATURE_VXLAN,
2960                                                         &patch_level, &a1);
2961                if (err)
2962                        patch_level = 0;
2963                enic->vxlan.flags = (u8)a1;
2964                /* mask bits that are supported by driver
2965                 */
2966                patch_level &= BIT_ULL(0) | BIT_ULL(2);
2967                patch_level = fls(patch_level);
2968                patch_level = patch_level ? patch_level - 1 : 0;
2969                enic->vxlan.patch_level = patch_level;
2970        }
2971
2972        netdev->features |= netdev->hw_features;
2973        netdev->vlan_features |= netdev->features;
2974
2975#ifdef CONFIG_RFS_ACCEL
2976        netdev->hw_features |= NETIF_F_NTUPLE;
2977#endif
2978
2979        if (using_dac)
2980                netdev->features |= NETIF_F_HIGHDMA;
2981
2982        netdev->priv_flags |= IFF_UNICAST_FLT;
2983
2984        /* MTU range: 68 - 9000 */
2985        netdev->min_mtu = ENIC_MIN_MTU;
2986        netdev->max_mtu = ENIC_MAX_MTU;
2987        netdev->mtu     = enic->port_mtu;
2988
2989        err = register_netdev(netdev);
2990        if (err) {
2991                dev_err(dev, "Cannot register net device, aborting\n");
2992                goto err_out_dev_deinit;
2993        }
2994        enic->rx_copybreak = RX_COPYBREAK_DEFAULT;
2995
2996        return 0;
2997
2998err_out_dev_deinit:
2999        enic_dev_deinit(enic);
3000err_out_dev_close:
3001        vnic_dev_close(enic->vdev);
3002err_out_disable_sriov:
3003        kfree(enic->pp);
3004err_out_disable_sriov_pp:
3005#ifdef CONFIG_PCI_IOV
3006        if (enic_sriov_enabled(enic)) {
3007                pci_disable_sriov(pdev);
3008                enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
3009        }
3010#endif
3011err_out_vnic_unregister:
3012        vnic_dev_unregister(enic->vdev);
3013err_out_iounmap:
3014        enic_iounmap(enic);
3015err_out_release_regions:
3016        pci_release_regions(pdev);
3017err_out_disable_device:
3018        pci_disable_device(pdev);
3019err_out_free_netdev:
3020        free_netdev(netdev);
3021
3022        return err;
3023}
3024
3025static void enic_remove(struct pci_dev *pdev)
3026{
3027        struct net_device *netdev = pci_get_drvdata(pdev);
3028
3029        if (netdev) {
3030                struct enic *enic = netdev_priv(netdev);
3031
3032                cancel_work_sync(&enic->reset);
3033                cancel_work_sync(&enic->change_mtu_work);
3034                unregister_netdev(netdev);
3035                enic_dev_deinit(enic);
3036                vnic_dev_close(enic->vdev);
3037#ifdef CONFIG_PCI_IOV
3038                if (enic_sriov_enabled(enic)) {
3039                        pci_disable_sriov(pdev);
3040                        enic->priv_flags &= ~ENIC_SRIOV_ENABLED;
3041                }
3042#endif
3043                kfree(enic->pp);
3044                vnic_dev_unregister(enic->vdev);
3045                enic_iounmap(enic);
3046                pci_release_regions(pdev);
3047                pci_disable_device(pdev);
3048                free_netdev(netdev);
3049        }
3050}
3051
3052static struct pci_driver enic_driver = {
3053        .name = DRV_NAME,
3054        .id_table = enic_id_table,
3055        .probe = enic_probe,
3056        .remove = enic_remove,
3057};
3058
3059static int __init enic_init_module(void)
3060{
3061        pr_info("%s, ver %s\n", DRV_DESCRIPTION, DRV_VERSION);
3062
3063        return pci_register_driver(&enic_driver);
3064}
3065
3066static void __exit enic_cleanup_module(void)
3067{
3068        pci_unregister_driver(&enic_driver);
3069}
3070
3071module_init(enic_init_module);
3072module_exit(enic_cleanup_module);
3073