linux/drivers/net/ethernet/ti/netcp_core.c
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   1/*
   2 * Keystone NetCP Core driver
   3 *
   4 * Copyright (C) 2014 Texas Instruments Incorporated
   5 * Authors:     Sandeep Nair <sandeep_n@ti.com>
   6 *              Sandeep Paulraj <s-paulraj@ti.com>
   7 *              Cyril Chemparathy <cyril@ti.com>
   8 *              Santosh Shilimkar <santosh.shilimkar@ti.com>
   9 *              Murali Karicheri <m-karicheri2@ti.com>
  10 *              Wingman Kwok <w-kwok2@ti.com>
  11 *
  12 * This program is free software; you can redistribute it and/or
  13 * modify it under the terms of the GNU General Public License as
  14 * published by the Free Software Foundation version 2.
  15 *
  16 * This program is distributed "as is" WITHOUT ANY WARRANTY of any
  17 * kind, whether express or implied; without even the implied warranty
  18 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 * GNU General Public License for more details.
  20 */
  21
  22#include <linux/io.h>
  23#include <linux/module.h>
  24#include <linux/of_net.h>
  25#include <linux/of_address.h>
  26#include <linux/if_vlan.h>
  27#include <linux/pm_runtime.h>
  28#include <linux/platform_device.h>
  29#include <linux/soc/ti/knav_qmss.h>
  30#include <linux/soc/ti/knav_dma.h>
  31
  32#include "netcp.h"
  33
  34#define NETCP_SOP_OFFSET        (NET_IP_ALIGN + NET_SKB_PAD)
  35#define NETCP_NAPI_WEIGHT       64
  36#define NETCP_TX_TIMEOUT        (5 * HZ)
  37#define NETCP_PACKET_SIZE       (ETH_FRAME_LEN + ETH_FCS_LEN)
  38#define NETCP_MIN_PACKET_SIZE   ETH_ZLEN
  39#define NETCP_MAX_MCAST_ADDR    16
  40
  41#define NETCP_EFUSE_REG_INDEX   0
  42
  43#define NETCP_MOD_PROBE_SKIPPED 1
  44#define NETCP_MOD_PROBE_FAILED  2
  45
  46#define NETCP_DEBUG (NETIF_MSG_HW       | NETIF_MSG_WOL         |       \
  47                    NETIF_MSG_DRV       | NETIF_MSG_LINK        |       \
  48                    NETIF_MSG_IFUP      | NETIF_MSG_INTR        |       \
  49                    NETIF_MSG_PROBE     | NETIF_MSG_TIMER       |       \
  50                    NETIF_MSG_IFDOWN    | NETIF_MSG_RX_ERR      |       \
  51                    NETIF_MSG_TX_ERR    | NETIF_MSG_TX_DONE     |       \
  52                    NETIF_MSG_PKTDATA   | NETIF_MSG_TX_QUEUED   |       \
  53                    NETIF_MSG_RX_STATUS)
  54
  55#define NETCP_EFUSE_ADDR_SWAP   2
  56
  57#define knav_queue_get_id(q)    knav_queue_device_control(q, \
  58                                KNAV_QUEUE_GET_ID, (unsigned long)NULL)
  59
  60#define knav_queue_enable_notify(q) knav_queue_device_control(q,        \
  61                                        KNAV_QUEUE_ENABLE_NOTIFY,       \
  62                                        (unsigned long)NULL)
  63
  64#define knav_queue_disable_notify(q) knav_queue_device_control(q,       \
  65                                        KNAV_QUEUE_DISABLE_NOTIFY,      \
  66                                        (unsigned long)NULL)
  67
  68#define knav_queue_get_count(q) knav_queue_device_control(q, \
  69                                KNAV_QUEUE_GET_COUNT, (unsigned long)NULL)
  70
  71#define for_each_netcp_module(module)                   \
  72        list_for_each_entry(module, &netcp_modules, module_list)
  73
  74#define for_each_netcp_device_module(netcp_device, inst_modpriv) \
  75        list_for_each_entry(inst_modpriv, \
  76                &((netcp_device)->modpriv_head), inst_list)
  77
  78#define for_each_module(netcp, intf_modpriv)                    \
  79        list_for_each_entry(intf_modpriv, &netcp->module_head, intf_list)
  80
  81/* Module management structures */
  82struct netcp_device {
  83        struct list_head        device_list;
  84        struct list_head        interface_head;
  85        struct list_head        modpriv_head;
  86        struct device           *device;
  87};
  88
  89struct netcp_inst_modpriv {
  90        struct netcp_device     *netcp_device;
  91        struct netcp_module     *netcp_module;
  92        struct list_head        inst_list;
  93        void                    *module_priv;
  94};
  95
  96struct netcp_intf_modpriv {
  97        struct netcp_intf       *netcp_priv;
  98        struct netcp_module     *netcp_module;
  99        struct list_head        intf_list;
 100        void                    *module_priv;
 101};
 102
 103struct netcp_tx_cb {
 104        void    *ts_context;
 105        void    (*txtstamp)(void *context, struct sk_buff *skb);
 106};
 107
 108static LIST_HEAD(netcp_devices);
 109static LIST_HEAD(netcp_modules);
 110static DEFINE_MUTEX(netcp_modules_lock);
 111
 112static int netcp_debug_level = -1;
 113module_param(netcp_debug_level, int, 0);
 114MODULE_PARM_DESC(netcp_debug_level, "Netcp debug level (NETIF_MSG bits) (0=none,...,16=all)");
 115
 116/* Helper functions - Get/Set */
 117static void get_pkt_info(dma_addr_t *buff, u32 *buff_len, dma_addr_t *ndesc,
 118                         struct knav_dma_desc *desc)
 119{
 120        *buff_len = le32_to_cpu(desc->buff_len);
 121        *buff = le32_to_cpu(desc->buff);
 122        *ndesc = le32_to_cpu(desc->next_desc);
 123}
 124
 125static void get_desc_info(u32 *desc_info, u32 *pkt_info,
 126                          struct knav_dma_desc *desc)
 127{
 128        *desc_info = le32_to_cpu(desc->desc_info);
 129        *pkt_info = le32_to_cpu(desc->packet_info);
 130}
 131
 132static u32 get_sw_data(int index, struct knav_dma_desc *desc)
 133{
 134        /* No Endian conversion needed as this data is untouched by hw */
 135        return desc->sw_data[index];
 136}
 137
 138/* use these macros to get sw data */
 139#define GET_SW_DATA0(desc) get_sw_data(0, desc)
 140#define GET_SW_DATA1(desc) get_sw_data(1, desc)
 141#define GET_SW_DATA2(desc) get_sw_data(2, desc)
 142#define GET_SW_DATA3(desc) get_sw_data(3, desc)
 143
 144static void get_org_pkt_info(dma_addr_t *buff, u32 *buff_len,
 145                             struct knav_dma_desc *desc)
 146{
 147        *buff = le32_to_cpu(desc->orig_buff);
 148        *buff_len = le32_to_cpu(desc->orig_len);
 149}
 150
 151static void get_words(dma_addr_t *words, int num_words, __le32 *desc)
 152{
 153        int i;
 154
 155        for (i = 0; i < num_words; i++)
 156                words[i] = le32_to_cpu(desc[i]);
 157}
 158
 159static void set_pkt_info(dma_addr_t buff, u32 buff_len, u32 ndesc,
 160                         struct knav_dma_desc *desc)
 161{
 162        desc->buff_len = cpu_to_le32(buff_len);
 163        desc->buff = cpu_to_le32(buff);
 164        desc->next_desc = cpu_to_le32(ndesc);
 165}
 166
 167static void set_desc_info(u32 desc_info, u32 pkt_info,
 168                          struct knav_dma_desc *desc)
 169{
 170        desc->desc_info = cpu_to_le32(desc_info);
 171        desc->packet_info = cpu_to_le32(pkt_info);
 172}
 173
 174static void set_sw_data(int index, u32 data, struct knav_dma_desc *desc)
 175{
 176        /* No Endian conversion needed as this data is untouched by hw */
 177        desc->sw_data[index] = data;
 178}
 179
 180/* use these macros to set sw data */
 181#define SET_SW_DATA0(data, desc) set_sw_data(0, data, desc)
 182#define SET_SW_DATA1(data, desc) set_sw_data(1, data, desc)
 183#define SET_SW_DATA2(data, desc) set_sw_data(2, data, desc)
 184#define SET_SW_DATA3(data, desc) set_sw_data(3, data, desc)
 185
 186static void set_org_pkt_info(dma_addr_t buff, u32 buff_len,
 187                             struct knav_dma_desc *desc)
 188{
 189        desc->orig_buff = cpu_to_le32(buff);
 190        desc->orig_len = cpu_to_le32(buff_len);
 191}
 192
 193static void set_words(u32 *words, int num_words, __le32 *desc)
 194{
 195        int i;
 196
 197        for (i = 0; i < num_words; i++)
 198                desc[i] = cpu_to_le32(words[i]);
 199}
 200
 201/* Read the e-fuse value as 32 bit values to be endian independent */
 202static int emac_arch_get_mac_addr(char *x, void __iomem *efuse_mac, u32 swap)
 203{
 204        unsigned int addr0, addr1;
 205
 206        addr1 = readl(efuse_mac + 4);
 207        addr0 = readl(efuse_mac);
 208
 209        switch (swap) {
 210        case NETCP_EFUSE_ADDR_SWAP:
 211                addr0 = addr1;
 212                addr1 = readl(efuse_mac);
 213                break;
 214        default:
 215                break;
 216        }
 217
 218        x[0] = (addr1 & 0x0000ff00) >> 8;
 219        x[1] = addr1 & 0x000000ff;
 220        x[2] = (addr0 & 0xff000000) >> 24;
 221        x[3] = (addr0 & 0x00ff0000) >> 16;
 222        x[4] = (addr0 & 0x0000ff00) >> 8;
 223        x[5] = addr0 & 0x000000ff;
 224
 225        return 0;
 226}
 227
 228static const char *netcp_node_name(struct device_node *node)
 229{
 230        const char *name;
 231
 232        if (of_property_read_string(node, "label", &name) < 0)
 233                name = node->name;
 234        if (!name)
 235                name = "unknown";
 236        return name;
 237}
 238
 239/* Module management routines */
 240static int netcp_register_interface(struct netcp_intf *netcp)
 241{
 242        int ret;
 243
 244        ret = register_netdev(netcp->ndev);
 245        if (!ret)
 246                netcp->netdev_registered = true;
 247        return ret;
 248}
 249
 250static int netcp_module_probe(struct netcp_device *netcp_device,
 251                              struct netcp_module *module)
 252{
 253        struct device *dev = netcp_device->device;
 254        struct device_node *devices, *interface, *node = dev->of_node;
 255        struct device_node *child;
 256        struct netcp_inst_modpriv *inst_modpriv;
 257        struct netcp_intf *netcp_intf;
 258        struct netcp_module *tmp;
 259        bool primary_module_registered = false;
 260        int ret;
 261
 262        /* Find this module in the sub-tree for this device */
 263        devices = of_get_child_by_name(node, "netcp-devices");
 264        if (!devices) {
 265                dev_err(dev, "could not find netcp-devices node\n");
 266                return NETCP_MOD_PROBE_SKIPPED;
 267        }
 268
 269        for_each_available_child_of_node(devices, child) {
 270                const char *name = netcp_node_name(child);
 271
 272                if (!strcasecmp(module->name, name))
 273                        break;
 274        }
 275
 276        of_node_put(devices);
 277        /* If module not used for this device, skip it */
 278        if (!child) {
 279                dev_warn(dev, "module(%s) not used for device\n", module->name);
 280                return NETCP_MOD_PROBE_SKIPPED;
 281        }
 282
 283        inst_modpriv = devm_kzalloc(dev, sizeof(*inst_modpriv), GFP_KERNEL);
 284        if (!inst_modpriv) {
 285                of_node_put(child);
 286                return -ENOMEM;
 287        }
 288
 289        inst_modpriv->netcp_device = netcp_device;
 290        inst_modpriv->netcp_module = module;
 291        list_add_tail(&inst_modpriv->inst_list, &netcp_device->modpriv_head);
 292
 293        ret = module->probe(netcp_device, dev, child,
 294                            &inst_modpriv->module_priv);
 295        of_node_put(child);
 296        if (ret) {
 297                dev_err(dev, "Probe of module(%s) failed with %d\n",
 298                        module->name, ret);
 299                list_del(&inst_modpriv->inst_list);
 300                devm_kfree(dev, inst_modpriv);
 301                return NETCP_MOD_PROBE_FAILED;
 302        }
 303
 304        /* Attach modules only if the primary module is probed */
 305        for_each_netcp_module(tmp) {
 306                if (tmp->primary)
 307                        primary_module_registered = true;
 308        }
 309
 310        if (!primary_module_registered)
 311                return 0;
 312
 313        /* Attach module to interfaces */
 314        list_for_each_entry(netcp_intf, &netcp_device->interface_head,
 315                            interface_list) {
 316                struct netcp_intf_modpriv *intf_modpriv;
 317
 318                intf_modpriv = devm_kzalloc(dev, sizeof(*intf_modpriv),
 319                                            GFP_KERNEL);
 320                if (!intf_modpriv)
 321                        return -ENOMEM;
 322
 323                interface = of_parse_phandle(netcp_intf->node_interface,
 324                                             module->name, 0);
 325
 326                if (!interface) {
 327                        devm_kfree(dev, intf_modpriv);
 328                        continue;
 329                }
 330
 331                intf_modpriv->netcp_priv = netcp_intf;
 332                intf_modpriv->netcp_module = module;
 333                list_add_tail(&intf_modpriv->intf_list,
 334                              &netcp_intf->module_head);
 335
 336                ret = module->attach(inst_modpriv->module_priv,
 337                                     netcp_intf->ndev, interface,
 338                                     &intf_modpriv->module_priv);
 339                of_node_put(interface);
 340                if (ret) {
 341                        dev_dbg(dev, "Attach of module %s declined with %d\n",
 342                                module->name, ret);
 343                        list_del(&intf_modpriv->intf_list);
 344                        devm_kfree(dev, intf_modpriv);
 345                        continue;
 346                }
 347        }
 348
 349        /* Now register the interface with netdev */
 350        list_for_each_entry(netcp_intf,
 351                            &netcp_device->interface_head,
 352                            interface_list) {
 353                /* If interface not registered then register now */
 354                if (!netcp_intf->netdev_registered) {
 355                        ret = netcp_register_interface(netcp_intf);
 356                        if (ret)
 357                                return -ENODEV;
 358                }
 359        }
 360        return 0;
 361}
 362
 363int netcp_register_module(struct netcp_module *module)
 364{
 365        struct netcp_device *netcp_device;
 366        struct netcp_module *tmp;
 367        int ret;
 368
 369        if (!module->name) {
 370                WARN(1, "error registering netcp module: no name\n");
 371                return -EINVAL;
 372        }
 373
 374        if (!module->probe) {
 375                WARN(1, "error registering netcp module: no probe\n");
 376                return -EINVAL;
 377        }
 378
 379        mutex_lock(&netcp_modules_lock);
 380
 381        for_each_netcp_module(tmp) {
 382                if (!strcasecmp(tmp->name, module->name)) {
 383                        mutex_unlock(&netcp_modules_lock);
 384                        return -EEXIST;
 385                }
 386        }
 387        list_add_tail(&module->module_list, &netcp_modules);
 388
 389        list_for_each_entry(netcp_device, &netcp_devices, device_list) {
 390                ret = netcp_module_probe(netcp_device, module);
 391                if (ret < 0)
 392                        goto fail;
 393        }
 394        mutex_unlock(&netcp_modules_lock);
 395        return 0;
 396
 397fail:
 398        mutex_unlock(&netcp_modules_lock);
 399        netcp_unregister_module(module);
 400        return ret;
 401}
 402EXPORT_SYMBOL_GPL(netcp_register_module);
 403
 404static void netcp_release_module(struct netcp_device *netcp_device,
 405                                 struct netcp_module *module)
 406{
 407        struct netcp_inst_modpriv *inst_modpriv, *inst_tmp;
 408        struct netcp_intf *netcp_intf, *netcp_tmp;
 409        struct device *dev = netcp_device->device;
 410
 411        /* Release the module from each interface */
 412        list_for_each_entry_safe(netcp_intf, netcp_tmp,
 413                                 &netcp_device->interface_head,
 414                                 interface_list) {
 415                struct netcp_intf_modpriv *intf_modpriv, *intf_tmp;
 416
 417                list_for_each_entry_safe(intf_modpriv, intf_tmp,
 418                                         &netcp_intf->module_head,
 419                                         intf_list) {
 420                        if (intf_modpriv->netcp_module == module) {
 421                                module->release(intf_modpriv->module_priv);
 422                                list_del(&intf_modpriv->intf_list);
 423                                devm_kfree(dev, intf_modpriv);
 424                                break;
 425                        }
 426                }
 427        }
 428
 429        /* Remove the module from each instance */
 430        list_for_each_entry_safe(inst_modpriv, inst_tmp,
 431                                 &netcp_device->modpriv_head, inst_list) {
 432                if (inst_modpriv->netcp_module == module) {
 433                        module->remove(netcp_device,
 434                                       inst_modpriv->module_priv);
 435                        list_del(&inst_modpriv->inst_list);
 436                        devm_kfree(dev, inst_modpriv);
 437                        break;
 438                }
 439        }
 440}
 441
 442void netcp_unregister_module(struct netcp_module *module)
 443{
 444        struct netcp_device *netcp_device;
 445        struct netcp_module *module_tmp;
 446
 447        mutex_lock(&netcp_modules_lock);
 448
 449        list_for_each_entry(netcp_device, &netcp_devices, device_list) {
 450                netcp_release_module(netcp_device, module);
 451        }
 452
 453        /* Remove the module from the module list */
 454        for_each_netcp_module(module_tmp) {
 455                if (module == module_tmp) {
 456                        list_del(&module->module_list);
 457                        break;
 458                }
 459        }
 460
 461        mutex_unlock(&netcp_modules_lock);
 462}
 463EXPORT_SYMBOL_GPL(netcp_unregister_module);
 464
 465void *netcp_module_get_intf_data(struct netcp_module *module,
 466                                 struct netcp_intf *intf)
 467{
 468        struct netcp_intf_modpriv *intf_modpriv;
 469
 470        list_for_each_entry(intf_modpriv, &intf->module_head, intf_list)
 471                if (intf_modpriv->netcp_module == module)
 472                        return intf_modpriv->module_priv;
 473        return NULL;
 474}
 475EXPORT_SYMBOL_GPL(netcp_module_get_intf_data);
 476
 477/* Module TX and RX Hook management */
 478struct netcp_hook_list {
 479        struct list_head         list;
 480        netcp_hook_rtn          *hook_rtn;
 481        void                    *hook_data;
 482        int                      order;
 483};
 484
 485int netcp_register_txhook(struct netcp_intf *netcp_priv, int order,
 486                          netcp_hook_rtn *hook_rtn, void *hook_data)
 487{
 488        struct netcp_hook_list *entry;
 489        struct netcp_hook_list *next;
 490        unsigned long flags;
 491
 492        entry = devm_kzalloc(netcp_priv->dev, sizeof(*entry), GFP_KERNEL);
 493        if (!entry)
 494                return -ENOMEM;
 495
 496        entry->hook_rtn  = hook_rtn;
 497        entry->hook_data = hook_data;
 498        entry->order     = order;
 499
 500        spin_lock_irqsave(&netcp_priv->lock, flags);
 501        list_for_each_entry(next, &netcp_priv->txhook_list_head, list) {
 502                if (next->order > order)
 503                        break;
 504        }
 505        __list_add(&entry->list, next->list.prev, &next->list);
 506        spin_unlock_irqrestore(&netcp_priv->lock, flags);
 507
 508        return 0;
 509}
 510EXPORT_SYMBOL_GPL(netcp_register_txhook);
 511
 512int netcp_unregister_txhook(struct netcp_intf *netcp_priv, int order,
 513                            netcp_hook_rtn *hook_rtn, void *hook_data)
 514{
 515        struct netcp_hook_list *next, *n;
 516        unsigned long flags;
 517
 518        spin_lock_irqsave(&netcp_priv->lock, flags);
 519        list_for_each_entry_safe(next, n, &netcp_priv->txhook_list_head, list) {
 520                if ((next->order     == order) &&
 521                    (next->hook_rtn  == hook_rtn) &&
 522                    (next->hook_data == hook_data)) {
 523                        list_del(&next->list);
 524                        spin_unlock_irqrestore(&netcp_priv->lock, flags);
 525                        devm_kfree(netcp_priv->dev, next);
 526                        return 0;
 527                }
 528        }
 529        spin_unlock_irqrestore(&netcp_priv->lock, flags);
 530        return -ENOENT;
 531}
 532EXPORT_SYMBOL_GPL(netcp_unregister_txhook);
 533
 534int netcp_register_rxhook(struct netcp_intf *netcp_priv, int order,
 535                          netcp_hook_rtn *hook_rtn, void *hook_data)
 536{
 537        struct netcp_hook_list *entry;
 538        struct netcp_hook_list *next;
 539        unsigned long flags;
 540
 541        entry = devm_kzalloc(netcp_priv->dev, sizeof(*entry), GFP_KERNEL);
 542        if (!entry)
 543                return -ENOMEM;
 544
 545        entry->hook_rtn  = hook_rtn;
 546        entry->hook_data = hook_data;
 547        entry->order     = order;
 548
 549        spin_lock_irqsave(&netcp_priv->lock, flags);
 550        list_for_each_entry(next, &netcp_priv->rxhook_list_head, list) {
 551                if (next->order > order)
 552                        break;
 553        }
 554        __list_add(&entry->list, next->list.prev, &next->list);
 555        spin_unlock_irqrestore(&netcp_priv->lock, flags);
 556
 557        return 0;
 558}
 559EXPORT_SYMBOL_GPL(netcp_register_rxhook);
 560
 561int netcp_unregister_rxhook(struct netcp_intf *netcp_priv, int order,
 562                            netcp_hook_rtn *hook_rtn, void *hook_data)
 563{
 564        struct netcp_hook_list *next, *n;
 565        unsigned long flags;
 566
 567        spin_lock_irqsave(&netcp_priv->lock, flags);
 568        list_for_each_entry_safe(next, n, &netcp_priv->rxhook_list_head, list) {
 569                if ((next->order     == order) &&
 570                    (next->hook_rtn  == hook_rtn) &&
 571                    (next->hook_data == hook_data)) {
 572                        list_del(&next->list);
 573                        spin_unlock_irqrestore(&netcp_priv->lock, flags);
 574                        devm_kfree(netcp_priv->dev, next);
 575                        return 0;
 576                }
 577        }
 578        spin_unlock_irqrestore(&netcp_priv->lock, flags);
 579
 580        return -ENOENT;
 581}
 582EXPORT_SYMBOL_GPL(netcp_unregister_rxhook);
 583
 584static void netcp_frag_free(bool is_frag, void *ptr)
 585{
 586        if (is_frag)
 587                skb_free_frag(ptr);
 588        else
 589                kfree(ptr);
 590}
 591
 592static void netcp_free_rx_desc_chain(struct netcp_intf *netcp,
 593                                     struct knav_dma_desc *desc)
 594{
 595        struct knav_dma_desc *ndesc;
 596        dma_addr_t dma_desc, dma_buf;
 597        unsigned int buf_len, dma_sz = sizeof(*ndesc);
 598        void *buf_ptr;
 599        u32 tmp;
 600
 601        get_words(&dma_desc, 1, &desc->next_desc);
 602
 603        while (dma_desc) {
 604                ndesc = knav_pool_desc_unmap(netcp->rx_pool, dma_desc, dma_sz);
 605                if (unlikely(!ndesc)) {
 606                        dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
 607                        break;
 608                }
 609                get_pkt_info(&dma_buf, &tmp, &dma_desc, ndesc);
 610                /* warning!!!! We are retrieving the virtual ptr in the sw_data
 611                 * field as a 32bit value. Will not work on 64bit machines
 612                 */
 613                buf_ptr = (void *)GET_SW_DATA0(ndesc);
 614                buf_len = (int)GET_SW_DATA1(desc);
 615                dma_unmap_page(netcp->dev, dma_buf, PAGE_SIZE, DMA_FROM_DEVICE);
 616                __free_page(buf_ptr);
 617                knav_pool_desc_put(netcp->rx_pool, desc);
 618        }
 619        /* warning!!!! We are retrieving the virtual ptr in the sw_data
 620         * field as a 32bit value. Will not work on 64bit machines
 621         */
 622        buf_ptr = (void *)GET_SW_DATA0(desc);
 623        buf_len = (int)GET_SW_DATA1(desc);
 624
 625        if (buf_ptr)
 626                netcp_frag_free(buf_len <= PAGE_SIZE, buf_ptr);
 627        knav_pool_desc_put(netcp->rx_pool, desc);
 628}
 629
 630static void netcp_empty_rx_queue(struct netcp_intf *netcp)
 631{
 632        struct netcp_stats *rx_stats = &netcp->stats;
 633        struct knav_dma_desc *desc;
 634        unsigned int dma_sz;
 635        dma_addr_t dma;
 636
 637        for (; ;) {
 638                dma = knav_queue_pop(netcp->rx_queue, &dma_sz);
 639                if (!dma)
 640                        break;
 641
 642                desc = knav_pool_desc_unmap(netcp->rx_pool, dma, dma_sz);
 643                if (unlikely(!desc)) {
 644                        dev_err(netcp->ndev_dev, "%s: failed to unmap Rx desc\n",
 645                                __func__);
 646                        rx_stats->rx_errors++;
 647                        continue;
 648                }
 649                netcp_free_rx_desc_chain(netcp, desc);
 650                rx_stats->rx_dropped++;
 651        }
 652}
 653
 654static int netcp_process_one_rx_packet(struct netcp_intf *netcp)
 655{
 656        struct netcp_stats *rx_stats = &netcp->stats;
 657        unsigned int dma_sz, buf_len, org_buf_len;
 658        struct knav_dma_desc *desc, *ndesc;
 659        unsigned int pkt_sz = 0, accum_sz;
 660        struct netcp_hook_list *rx_hook;
 661        dma_addr_t dma_desc, dma_buff;
 662        struct netcp_packet p_info;
 663        struct sk_buff *skb;
 664        void *org_buf_ptr;
 665        u32 tmp;
 666
 667        dma_desc = knav_queue_pop(netcp->rx_queue, &dma_sz);
 668        if (!dma_desc)
 669                return -1;
 670
 671        desc = knav_pool_desc_unmap(netcp->rx_pool, dma_desc, dma_sz);
 672        if (unlikely(!desc)) {
 673                dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
 674                return 0;
 675        }
 676
 677        get_pkt_info(&dma_buff, &buf_len, &dma_desc, desc);
 678        /* warning!!!! We are retrieving the virtual ptr in the sw_data
 679         * field as a 32bit value. Will not work on 64bit machines
 680         */
 681        org_buf_ptr = (void *)GET_SW_DATA0(desc);
 682        org_buf_len = (int)GET_SW_DATA1(desc);
 683
 684        if (unlikely(!org_buf_ptr)) {
 685                dev_err(netcp->ndev_dev, "NULL bufptr in desc\n");
 686                goto free_desc;
 687        }
 688
 689        pkt_sz &= KNAV_DMA_DESC_PKT_LEN_MASK;
 690        accum_sz = buf_len;
 691        dma_unmap_single(netcp->dev, dma_buff, buf_len, DMA_FROM_DEVICE);
 692
 693        /* Build a new sk_buff for the primary buffer */
 694        skb = build_skb(org_buf_ptr, org_buf_len);
 695        if (unlikely(!skb)) {
 696                dev_err(netcp->ndev_dev, "build_skb() failed\n");
 697                goto free_desc;
 698        }
 699
 700        /* update data, tail and len */
 701        skb_reserve(skb, NETCP_SOP_OFFSET);
 702        __skb_put(skb, buf_len);
 703
 704        /* Fill in the page fragment list */
 705        while (dma_desc) {
 706                struct page *page;
 707
 708                ndesc = knav_pool_desc_unmap(netcp->rx_pool, dma_desc, dma_sz);
 709                if (unlikely(!ndesc)) {
 710                        dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
 711                        goto free_desc;
 712                }
 713
 714                get_pkt_info(&dma_buff, &buf_len, &dma_desc, ndesc);
 715                /* warning!!!! We are retrieving the virtual ptr in the sw_data
 716                 * field as a 32bit value. Will not work on 64bit machines
 717                 */
 718                page = (struct page *)GET_SW_DATA0(ndesc);
 719
 720                if (likely(dma_buff && buf_len && page)) {
 721                        dma_unmap_page(netcp->dev, dma_buff, PAGE_SIZE,
 722                                       DMA_FROM_DEVICE);
 723                } else {
 724                        dev_err(netcp->ndev_dev, "Bad Rx desc dma_buff(%pad), len(%d), page(%p)\n",
 725                                &dma_buff, buf_len, page);
 726                        goto free_desc;
 727                }
 728
 729                skb_add_rx_frag(skb, skb_shinfo(skb)->nr_frags, page,
 730                                offset_in_page(dma_buff), buf_len, PAGE_SIZE);
 731                accum_sz += buf_len;
 732
 733                /* Free the descriptor */
 734                knav_pool_desc_put(netcp->rx_pool, ndesc);
 735        }
 736
 737        /* check for packet len and warn */
 738        if (unlikely(pkt_sz != accum_sz))
 739                dev_dbg(netcp->ndev_dev, "mismatch in packet size(%d) & sum of fragments(%d)\n",
 740                        pkt_sz, accum_sz);
 741
 742        /* Newer version of the Ethernet switch can trim the Ethernet FCS
 743         * from the packet and is indicated in hw_cap. So trim it only for
 744         * older h/w
 745         */
 746        if (!(netcp->hw_cap & ETH_SW_CAN_REMOVE_ETH_FCS))
 747                __pskb_trim(skb, skb->len - ETH_FCS_LEN);
 748
 749        /* Call each of the RX hooks */
 750        p_info.skb = skb;
 751        skb->dev = netcp->ndev;
 752        p_info.rxtstamp_complete = false;
 753        get_desc_info(&tmp, &p_info.eflags, desc);
 754        p_info.epib = desc->epib;
 755        p_info.psdata = (u32 __force *)desc->psdata;
 756        p_info.eflags = ((p_info.eflags >> KNAV_DMA_DESC_EFLAGS_SHIFT) &
 757                         KNAV_DMA_DESC_EFLAGS_MASK);
 758        list_for_each_entry(rx_hook, &netcp->rxhook_list_head, list) {
 759                int ret;
 760
 761                ret = rx_hook->hook_rtn(rx_hook->order, rx_hook->hook_data,
 762                                        &p_info);
 763                if (unlikely(ret)) {
 764                        dev_err(netcp->ndev_dev, "RX hook %d failed: %d\n",
 765                                rx_hook->order, ret);
 766                        /* Free the primary descriptor */
 767                        rx_stats->rx_dropped++;
 768                        knav_pool_desc_put(netcp->rx_pool, desc);
 769                        dev_kfree_skb(skb);
 770                        return 0;
 771                }
 772        }
 773        /* Free the primary descriptor */
 774        knav_pool_desc_put(netcp->rx_pool, desc);
 775
 776        u64_stats_update_begin(&rx_stats->syncp_rx);
 777        rx_stats->rx_packets++;
 778        rx_stats->rx_bytes += skb->len;
 779        u64_stats_update_end(&rx_stats->syncp_rx);
 780
 781        /* push skb up the stack */
 782        skb->protocol = eth_type_trans(skb, netcp->ndev);
 783        netif_receive_skb(skb);
 784        return 0;
 785
 786free_desc:
 787        netcp_free_rx_desc_chain(netcp, desc);
 788        rx_stats->rx_errors++;
 789        return 0;
 790}
 791
 792static int netcp_process_rx_packets(struct netcp_intf *netcp,
 793                                    unsigned int budget)
 794{
 795        int i;
 796
 797        for (i = 0; (i < budget) && !netcp_process_one_rx_packet(netcp); i++)
 798                ;
 799        return i;
 800}
 801
 802/* Release descriptors and attached buffers from Rx FDQ */
 803static void netcp_free_rx_buf(struct netcp_intf *netcp, int fdq)
 804{
 805        struct knav_dma_desc *desc;
 806        unsigned int buf_len, dma_sz;
 807        dma_addr_t dma;
 808        void *buf_ptr;
 809
 810        /* Allocate descriptor */
 811        while ((dma = knav_queue_pop(netcp->rx_fdq[fdq], &dma_sz))) {
 812                desc = knav_pool_desc_unmap(netcp->rx_pool, dma, dma_sz);
 813                if (unlikely(!desc)) {
 814                        dev_err(netcp->ndev_dev, "failed to unmap Rx desc\n");
 815                        continue;
 816                }
 817
 818                get_org_pkt_info(&dma, &buf_len, desc);
 819                /* warning!!!! We are retrieving the virtual ptr in the sw_data
 820                 * field as a 32bit value. Will not work on 64bit machines
 821                 */
 822                buf_ptr = (void *)GET_SW_DATA0(desc);
 823
 824                if (unlikely(!dma)) {
 825                        dev_err(netcp->ndev_dev, "NULL orig_buff in desc\n");
 826                        knav_pool_desc_put(netcp->rx_pool, desc);
 827                        continue;
 828                }
 829
 830                if (unlikely(!buf_ptr)) {
 831                        dev_err(netcp->ndev_dev, "NULL bufptr in desc\n");
 832                        knav_pool_desc_put(netcp->rx_pool, desc);
 833                        continue;
 834                }
 835
 836                if (fdq == 0) {
 837                        dma_unmap_single(netcp->dev, dma, buf_len,
 838                                         DMA_FROM_DEVICE);
 839                        netcp_frag_free((buf_len <= PAGE_SIZE), buf_ptr);
 840                } else {
 841                        dma_unmap_page(netcp->dev, dma, buf_len,
 842                                       DMA_FROM_DEVICE);
 843                        __free_page(buf_ptr);
 844                }
 845
 846                knav_pool_desc_put(netcp->rx_pool, desc);
 847        }
 848}
 849
 850static void netcp_rxpool_free(struct netcp_intf *netcp)
 851{
 852        int i;
 853
 854        for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN &&
 855             !IS_ERR_OR_NULL(netcp->rx_fdq[i]); i++)
 856                netcp_free_rx_buf(netcp, i);
 857
 858        if (knav_pool_count(netcp->rx_pool) != netcp->rx_pool_size)
 859                dev_err(netcp->ndev_dev, "Lost Rx (%d) descriptors\n",
 860                        netcp->rx_pool_size - knav_pool_count(netcp->rx_pool));
 861
 862        knav_pool_destroy(netcp->rx_pool);
 863        netcp->rx_pool = NULL;
 864}
 865
 866static int netcp_allocate_rx_buf(struct netcp_intf *netcp, int fdq)
 867{
 868        struct knav_dma_desc *hwdesc;
 869        unsigned int buf_len, dma_sz;
 870        u32 desc_info, pkt_info;
 871        struct page *page;
 872        dma_addr_t dma;
 873        void *bufptr;
 874        u32 sw_data[2];
 875
 876        /* Allocate descriptor */
 877        hwdesc = knav_pool_desc_get(netcp->rx_pool);
 878        if (IS_ERR_OR_NULL(hwdesc)) {
 879                dev_dbg(netcp->ndev_dev, "out of rx pool desc\n");
 880                return -ENOMEM;
 881        }
 882
 883        if (likely(fdq == 0)) {
 884                unsigned int primary_buf_len;
 885                /* Allocate a primary receive queue entry */
 886                buf_len = NETCP_PACKET_SIZE + NETCP_SOP_OFFSET;
 887                primary_buf_len = SKB_DATA_ALIGN(buf_len) +
 888                                SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
 889
 890                bufptr = netdev_alloc_frag(primary_buf_len);
 891                sw_data[1] = primary_buf_len;
 892
 893                if (unlikely(!bufptr)) {
 894                        dev_warn_ratelimited(netcp->ndev_dev,
 895                                             "Primary RX buffer alloc failed\n");
 896                        goto fail;
 897                }
 898                dma = dma_map_single(netcp->dev, bufptr, buf_len,
 899                                     DMA_TO_DEVICE);
 900                if (unlikely(dma_mapping_error(netcp->dev, dma)))
 901                        goto fail;
 902
 903                /* warning!!!! We are saving the virtual ptr in the sw_data
 904                 * field as a 32bit value. Will not work on 64bit machines
 905                 */
 906                sw_data[0] = (u32)bufptr;
 907        } else {
 908                /* Allocate a secondary receive queue entry */
 909                page = alloc_page(GFP_ATOMIC | GFP_DMA);
 910                if (unlikely(!page)) {
 911                        dev_warn_ratelimited(netcp->ndev_dev, "Secondary page alloc failed\n");
 912                        goto fail;
 913                }
 914                buf_len = PAGE_SIZE;
 915                dma = dma_map_page(netcp->dev, page, 0, buf_len, DMA_TO_DEVICE);
 916                /* warning!!!! We are saving the virtual ptr in the sw_data
 917                 * field as a 32bit value. Will not work on 64bit machines
 918                 */
 919                sw_data[0] = (u32)page;
 920                sw_data[1] = 0;
 921        }
 922
 923        desc_info =  KNAV_DMA_DESC_PS_INFO_IN_DESC;
 924        desc_info |= buf_len & KNAV_DMA_DESC_PKT_LEN_MASK;
 925        pkt_info =  KNAV_DMA_DESC_HAS_EPIB;
 926        pkt_info |= KNAV_DMA_NUM_PS_WORDS << KNAV_DMA_DESC_PSLEN_SHIFT;
 927        pkt_info |= (netcp->rx_queue_id & KNAV_DMA_DESC_RETQ_MASK) <<
 928                    KNAV_DMA_DESC_RETQ_SHIFT;
 929        set_org_pkt_info(dma, buf_len, hwdesc);
 930        SET_SW_DATA0(sw_data[0], hwdesc);
 931        SET_SW_DATA1(sw_data[1], hwdesc);
 932        set_desc_info(desc_info, pkt_info, hwdesc);
 933
 934        /* Push to FDQs */
 935        knav_pool_desc_map(netcp->rx_pool, hwdesc, sizeof(*hwdesc), &dma,
 936                           &dma_sz);
 937        knav_queue_push(netcp->rx_fdq[fdq], dma, sizeof(*hwdesc), 0);
 938        return 0;
 939
 940fail:
 941        knav_pool_desc_put(netcp->rx_pool, hwdesc);
 942        return -ENOMEM;
 943}
 944
 945/* Refill Rx FDQ with descriptors & attached buffers */
 946static void netcp_rxpool_refill(struct netcp_intf *netcp)
 947{
 948        u32 fdq_deficit[KNAV_DMA_FDQ_PER_CHAN] = {0};
 949        int i, ret = 0;
 950
 951        /* Calculate the FDQ deficit and refill */
 952        for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN && netcp->rx_fdq[i]; i++) {
 953                fdq_deficit[i] = netcp->rx_queue_depths[i] -
 954                                 knav_queue_get_count(netcp->rx_fdq[i]);
 955
 956                while (fdq_deficit[i]-- && !ret)
 957                        ret = netcp_allocate_rx_buf(netcp, i);
 958        } /* end for fdqs */
 959}
 960
 961/* NAPI poll */
 962static int netcp_rx_poll(struct napi_struct *napi, int budget)
 963{
 964        struct netcp_intf *netcp = container_of(napi, struct netcp_intf,
 965                                                rx_napi);
 966        unsigned int packets;
 967
 968        packets = netcp_process_rx_packets(netcp, budget);
 969
 970        netcp_rxpool_refill(netcp);
 971        if (packets < budget) {
 972                napi_complete_done(&netcp->rx_napi, packets);
 973                knav_queue_enable_notify(netcp->rx_queue);
 974        }
 975
 976        return packets;
 977}
 978
 979static void netcp_rx_notify(void *arg)
 980{
 981        struct netcp_intf *netcp = arg;
 982
 983        knav_queue_disable_notify(netcp->rx_queue);
 984        napi_schedule(&netcp->rx_napi);
 985}
 986
 987static void netcp_free_tx_desc_chain(struct netcp_intf *netcp,
 988                                     struct knav_dma_desc *desc,
 989                                     unsigned int desc_sz)
 990{
 991        struct knav_dma_desc *ndesc = desc;
 992        dma_addr_t dma_desc, dma_buf;
 993        unsigned int buf_len;
 994
 995        while (ndesc) {
 996                get_pkt_info(&dma_buf, &buf_len, &dma_desc, ndesc);
 997
 998                if (dma_buf && buf_len)
 999                        dma_unmap_single(netcp->dev, dma_buf, buf_len,
1000                                         DMA_TO_DEVICE);
1001                else
1002                        dev_warn(netcp->ndev_dev, "bad Tx desc buf(%pad), len(%d)\n",
1003                                 &dma_buf, buf_len);
1004
1005                knav_pool_desc_put(netcp->tx_pool, ndesc);
1006                ndesc = NULL;
1007                if (dma_desc) {
1008                        ndesc = knav_pool_desc_unmap(netcp->tx_pool, dma_desc,
1009                                                     desc_sz);
1010                        if (!ndesc)
1011                                dev_err(netcp->ndev_dev, "failed to unmap Tx desc\n");
1012                }
1013        }
1014}
1015
1016static int netcp_process_tx_compl_packets(struct netcp_intf *netcp,
1017                                          unsigned int budget)
1018{
1019        struct netcp_stats *tx_stats = &netcp->stats;
1020        struct knav_dma_desc *desc;
1021        struct netcp_tx_cb *tx_cb;
1022        struct sk_buff *skb;
1023        unsigned int dma_sz;
1024        dma_addr_t dma;
1025        int pkts = 0;
1026
1027        while (budget--) {
1028                dma = knav_queue_pop(netcp->tx_compl_q, &dma_sz);
1029                if (!dma)
1030                        break;
1031                desc = knav_pool_desc_unmap(netcp->tx_pool, dma, dma_sz);
1032                if (unlikely(!desc)) {
1033                        dev_err(netcp->ndev_dev, "failed to unmap Tx desc\n");
1034                        tx_stats->tx_errors++;
1035                        continue;
1036                }
1037
1038                /* warning!!!! We are retrieving the virtual ptr in the sw_data
1039                 * field as a 32bit value. Will not work on 64bit machines
1040                 */
1041                skb = (struct sk_buff *)GET_SW_DATA0(desc);
1042                netcp_free_tx_desc_chain(netcp, desc, dma_sz);
1043                if (!skb) {
1044                        dev_err(netcp->ndev_dev, "No skb in Tx desc\n");
1045                        tx_stats->tx_errors++;
1046                        continue;
1047                }
1048
1049                tx_cb = (struct netcp_tx_cb *)skb->cb;
1050                if (tx_cb->txtstamp)
1051                        tx_cb->txtstamp(tx_cb->ts_context, skb);
1052
1053                if (netif_subqueue_stopped(netcp->ndev, skb) &&
1054                    netif_running(netcp->ndev) &&
1055                    (knav_pool_count(netcp->tx_pool) >
1056                    netcp->tx_resume_threshold)) {
1057                        u16 subqueue = skb_get_queue_mapping(skb);
1058
1059                        netif_wake_subqueue(netcp->ndev, subqueue);
1060                }
1061
1062                u64_stats_update_begin(&tx_stats->syncp_tx);
1063                tx_stats->tx_packets++;
1064                tx_stats->tx_bytes += skb->len;
1065                u64_stats_update_end(&tx_stats->syncp_tx);
1066                dev_kfree_skb(skb);
1067                pkts++;
1068        }
1069        return pkts;
1070}
1071
1072static int netcp_tx_poll(struct napi_struct *napi, int budget)
1073{
1074        int packets;
1075        struct netcp_intf *netcp = container_of(napi, struct netcp_intf,
1076                                                tx_napi);
1077
1078        packets = netcp_process_tx_compl_packets(netcp, budget);
1079        if (packets < budget) {
1080                napi_complete(&netcp->tx_napi);
1081                knav_queue_enable_notify(netcp->tx_compl_q);
1082        }
1083
1084        return packets;
1085}
1086
1087static void netcp_tx_notify(void *arg)
1088{
1089        struct netcp_intf *netcp = arg;
1090
1091        knav_queue_disable_notify(netcp->tx_compl_q);
1092        napi_schedule(&netcp->tx_napi);
1093}
1094
1095static struct knav_dma_desc*
1096netcp_tx_map_skb(struct sk_buff *skb, struct netcp_intf *netcp)
1097{
1098        struct knav_dma_desc *desc, *ndesc, *pdesc;
1099        unsigned int pkt_len = skb_headlen(skb);
1100        struct device *dev = netcp->dev;
1101        dma_addr_t dma_addr;
1102        unsigned int dma_sz;
1103        int i;
1104
1105        /* Map the linear buffer */
1106        dma_addr = dma_map_single(dev, skb->data, pkt_len, DMA_TO_DEVICE);
1107        if (unlikely(dma_mapping_error(dev, dma_addr))) {
1108                dev_err(netcp->ndev_dev, "Failed to map skb buffer\n");
1109                return NULL;
1110        }
1111
1112        desc = knav_pool_desc_get(netcp->tx_pool);
1113        if (IS_ERR_OR_NULL(desc)) {
1114                dev_err(netcp->ndev_dev, "out of TX desc\n");
1115                dma_unmap_single(dev, dma_addr, pkt_len, DMA_TO_DEVICE);
1116                return NULL;
1117        }
1118
1119        set_pkt_info(dma_addr, pkt_len, 0, desc);
1120        if (skb_is_nonlinear(skb)) {
1121                prefetchw(skb_shinfo(skb));
1122        } else {
1123                desc->next_desc = 0;
1124                goto upd_pkt_len;
1125        }
1126
1127        pdesc = desc;
1128
1129        /* Handle the case where skb is fragmented in pages */
1130        for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1131                skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1132                struct page *page = skb_frag_page(frag);
1133                u32 page_offset = frag->page_offset;
1134                u32 buf_len = skb_frag_size(frag);
1135                dma_addr_t desc_dma;
1136                u32 desc_dma_32;
1137
1138                dma_addr = dma_map_page(dev, page, page_offset, buf_len,
1139                                        DMA_TO_DEVICE);
1140                if (unlikely(!dma_addr)) {
1141                        dev_err(netcp->ndev_dev, "Failed to map skb page\n");
1142                        goto free_descs;
1143                }
1144
1145                ndesc = knav_pool_desc_get(netcp->tx_pool);
1146                if (IS_ERR_OR_NULL(ndesc)) {
1147                        dev_err(netcp->ndev_dev, "out of TX desc for frags\n");
1148                        dma_unmap_page(dev, dma_addr, buf_len, DMA_TO_DEVICE);
1149                        goto free_descs;
1150                }
1151
1152                desc_dma = knav_pool_desc_virt_to_dma(netcp->tx_pool, ndesc);
1153                set_pkt_info(dma_addr, buf_len, 0, ndesc);
1154                desc_dma_32 = (u32)desc_dma;
1155                set_words(&desc_dma_32, 1, &pdesc->next_desc);
1156                pkt_len += buf_len;
1157                if (pdesc != desc)
1158                        knav_pool_desc_map(netcp->tx_pool, pdesc,
1159                                           sizeof(*pdesc), &desc_dma, &dma_sz);
1160                pdesc = ndesc;
1161        }
1162        if (pdesc != desc)
1163                knav_pool_desc_map(netcp->tx_pool, pdesc, sizeof(*pdesc),
1164                                   &dma_addr, &dma_sz);
1165
1166        /* frag list based linkage is not supported for now. */
1167        if (skb_shinfo(skb)->frag_list) {
1168                dev_err_ratelimited(netcp->ndev_dev, "NETIF_F_FRAGLIST not supported\n");
1169                goto free_descs;
1170        }
1171
1172upd_pkt_len:
1173        WARN_ON(pkt_len != skb->len);
1174
1175        pkt_len &= KNAV_DMA_DESC_PKT_LEN_MASK;
1176        set_words(&pkt_len, 1, &desc->desc_info);
1177        return desc;
1178
1179free_descs:
1180        netcp_free_tx_desc_chain(netcp, desc, sizeof(*desc));
1181        return NULL;
1182}
1183
1184static int netcp_tx_submit_skb(struct netcp_intf *netcp,
1185                               struct sk_buff *skb,
1186                               struct knav_dma_desc *desc)
1187{
1188        struct netcp_tx_pipe *tx_pipe = NULL;
1189        struct netcp_hook_list *tx_hook;
1190        struct netcp_packet p_info;
1191        struct netcp_tx_cb *tx_cb;
1192        unsigned int dma_sz;
1193        dma_addr_t dma;
1194        u32 tmp = 0;
1195        int ret = 0;
1196
1197        p_info.netcp = netcp;
1198        p_info.skb = skb;
1199        p_info.tx_pipe = NULL;
1200        p_info.psdata_len = 0;
1201        p_info.ts_context = NULL;
1202        p_info.txtstamp = NULL;
1203        p_info.epib = desc->epib;
1204        p_info.psdata = (u32 __force *)desc->psdata;
1205        memset(p_info.epib, 0, KNAV_DMA_NUM_EPIB_WORDS * sizeof(__le32));
1206
1207        /* Find out where to inject the packet for transmission */
1208        list_for_each_entry(tx_hook, &netcp->txhook_list_head, list) {
1209                ret = tx_hook->hook_rtn(tx_hook->order, tx_hook->hook_data,
1210                                        &p_info);
1211                if (unlikely(ret != 0)) {
1212                        dev_err(netcp->ndev_dev, "TX hook %d rejected the packet with reason(%d)\n",
1213                                tx_hook->order, ret);
1214                        ret = (ret < 0) ? ret : NETDEV_TX_OK;
1215                        goto out;
1216                }
1217        }
1218
1219        /* Make sure some TX hook claimed the packet */
1220        tx_pipe = p_info.tx_pipe;
1221        if (!tx_pipe) {
1222                dev_err(netcp->ndev_dev, "No TX hook claimed the packet!\n");
1223                ret = -ENXIO;
1224                goto out;
1225        }
1226
1227        tx_cb = (struct netcp_tx_cb *)skb->cb;
1228        tx_cb->ts_context = p_info.ts_context;
1229        tx_cb->txtstamp = p_info.txtstamp;
1230
1231        /* update descriptor */
1232        if (p_info.psdata_len) {
1233                /* psdata points to both native-endian and device-endian data */
1234                __le32 *psdata = (void __force *)p_info.psdata;
1235
1236                set_words((u32 *)psdata +
1237                          (KNAV_DMA_NUM_PS_WORDS - p_info.psdata_len),
1238                          p_info.psdata_len, psdata);
1239                tmp |= (p_info.psdata_len & KNAV_DMA_DESC_PSLEN_MASK) <<
1240                        KNAV_DMA_DESC_PSLEN_SHIFT;
1241        }
1242
1243        tmp |= KNAV_DMA_DESC_HAS_EPIB |
1244                ((netcp->tx_compl_qid & KNAV_DMA_DESC_RETQ_MASK) <<
1245                KNAV_DMA_DESC_RETQ_SHIFT);
1246
1247        if (!(tx_pipe->flags & SWITCH_TO_PORT_IN_TAGINFO)) {
1248                tmp |= ((tx_pipe->switch_to_port & KNAV_DMA_DESC_PSFLAG_MASK) <<
1249                        KNAV_DMA_DESC_PSFLAG_SHIFT);
1250        }
1251
1252        set_words(&tmp, 1, &desc->packet_info);
1253        /* warning!!!! We are saving the virtual ptr in the sw_data
1254         * field as a 32bit value. Will not work on 64bit machines
1255         */
1256        SET_SW_DATA0((u32)skb, desc);
1257
1258        if (tx_pipe->flags & SWITCH_TO_PORT_IN_TAGINFO) {
1259                tmp = tx_pipe->switch_to_port;
1260                set_words(&tmp, 1, &desc->tag_info);
1261        }
1262
1263        /* submit packet descriptor */
1264        ret = knav_pool_desc_map(netcp->tx_pool, desc, sizeof(*desc), &dma,
1265                                 &dma_sz);
1266        if (unlikely(ret)) {
1267                dev_err(netcp->ndev_dev, "%s() failed to map desc\n", __func__);
1268                ret = -ENOMEM;
1269                goto out;
1270        }
1271        skb_tx_timestamp(skb);
1272        knav_queue_push(tx_pipe->dma_queue, dma, dma_sz, 0);
1273
1274out:
1275        return ret;
1276}
1277
1278/* Submit the packet */
1279static int netcp_ndo_start_xmit(struct sk_buff *skb, struct net_device *ndev)
1280{
1281        struct netcp_intf *netcp = netdev_priv(ndev);
1282        struct netcp_stats *tx_stats = &netcp->stats;
1283        int subqueue = skb_get_queue_mapping(skb);
1284        struct knav_dma_desc *desc;
1285        int desc_count, ret = 0;
1286
1287        if (unlikely(skb->len <= 0)) {
1288                dev_kfree_skb(skb);
1289                return NETDEV_TX_OK;
1290        }
1291
1292        if (unlikely(skb->len < NETCP_MIN_PACKET_SIZE)) {
1293                ret = skb_padto(skb, NETCP_MIN_PACKET_SIZE);
1294                if (ret < 0) {
1295                        /* If we get here, the skb has already been dropped */
1296                        dev_warn(netcp->ndev_dev, "padding failed (%d), packet dropped\n",
1297                                 ret);
1298                        tx_stats->tx_dropped++;
1299                        return ret;
1300                }
1301                skb->len = NETCP_MIN_PACKET_SIZE;
1302        }
1303
1304        desc = netcp_tx_map_skb(skb, netcp);
1305        if (unlikely(!desc)) {
1306                netif_stop_subqueue(ndev, subqueue);
1307                ret = -ENOBUFS;
1308                goto drop;
1309        }
1310
1311        ret = netcp_tx_submit_skb(netcp, skb, desc);
1312        if (ret)
1313                goto drop;
1314
1315        /* Check Tx pool count & stop subqueue if needed */
1316        desc_count = knav_pool_count(netcp->tx_pool);
1317        if (desc_count < netcp->tx_pause_threshold) {
1318                dev_dbg(netcp->ndev_dev, "pausing tx, count(%d)\n", desc_count);
1319                netif_stop_subqueue(ndev, subqueue);
1320        }
1321        return NETDEV_TX_OK;
1322
1323drop:
1324        tx_stats->tx_dropped++;
1325        if (desc)
1326                netcp_free_tx_desc_chain(netcp, desc, sizeof(*desc));
1327        dev_kfree_skb(skb);
1328        return ret;
1329}
1330
1331int netcp_txpipe_close(struct netcp_tx_pipe *tx_pipe)
1332{
1333        if (tx_pipe->dma_channel) {
1334                knav_dma_close_channel(tx_pipe->dma_channel);
1335                tx_pipe->dma_channel = NULL;
1336        }
1337        return 0;
1338}
1339EXPORT_SYMBOL_GPL(netcp_txpipe_close);
1340
1341int netcp_txpipe_open(struct netcp_tx_pipe *tx_pipe)
1342{
1343        struct device *dev = tx_pipe->netcp_device->device;
1344        struct knav_dma_cfg config;
1345        int ret = 0;
1346        u8 name[16];
1347
1348        memset(&config, 0, sizeof(config));
1349        config.direction = DMA_MEM_TO_DEV;
1350        config.u.tx.filt_einfo = false;
1351        config.u.tx.filt_pswords = false;
1352        config.u.tx.priority = DMA_PRIO_MED_L;
1353
1354        tx_pipe->dma_channel = knav_dma_open_channel(dev,
1355                                tx_pipe->dma_chan_name, &config);
1356        if (IS_ERR(tx_pipe->dma_channel)) {
1357                dev_err(dev, "failed opening tx chan(%s)\n",
1358                        tx_pipe->dma_chan_name);
1359                ret = PTR_ERR(tx_pipe->dma_channel);
1360                goto err;
1361        }
1362
1363        snprintf(name, sizeof(name), "tx-pipe-%s", dev_name(dev));
1364        tx_pipe->dma_queue = knav_queue_open(name, tx_pipe->dma_queue_id,
1365                                             KNAV_QUEUE_SHARED);
1366        if (IS_ERR(tx_pipe->dma_queue)) {
1367                dev_err(dev, "Could not open DMA queue for channel \"%s\": %d\n",
1368                        name, ret);
1369                ret = PTR_ERR(tx_pipe->dma_queue);
1370                goto err;
1371        }
1372
1373        dev_dbg(dev, "opened tx pipe %s\n", name);
1374        return 0;
1375
1376err:
1377        if (!IS_ERR_OR_NULL(tx_pipe->dma_channel))
1378                knav_dma_close_channel(tx_pipe->dma_channel);
1379        tx_pipe->dma_channel = NULL;
1380        return ret;
1381}
1382EXPORT_SYMBOL_GPL(netcp_txpipe_open);
1383
1384int netcp_txpipe_init(struct netcp_tx_pipe *tx_pipe,
1385                      struct netcp_device *netcp_device,
1386                      const char *dma_chan_name, unsigned int dma_queue_id)
1387{
1388        memset(tx_pipe, 0, sizeof(*tx_pipe));
1389        tx_pipe->netcp_device = netcp_device;
1390        tx_pipe->dma_chan_name = dma_chan_name;
1391        tx_pipe->dma_queue_id = dma_queue_id;
1392        return 0;
1393}
1394EXPORT_SYMBOL_GPL(netcp_txpipe_init);
1395
1396static struct netcp_addr *netcp_addr_find(struct netcp_intf *netcp,
1397                                          const u8 *addr,
1398                                          enum netcp_addr_type type)
1399{
1400        struct netcp_addr *naddr;
1401
1402        list_for_each_entry(naddr, &netcp->addr_list, node) {
1403                if (naddr->type != type)
1404                        continue;
1405                if (addr && memcmp(addr, naddr->addr, ETH_ALEN))
1406                        continue;
1407                return naddr;
1408        }
1409
1410        return NULL;
1411}
1412
1413static struct netcp_addr *netcp_addr_add(struct netcp_intf *netcp,
1414                                         const u8 *addr,
1415                                         enum netcp_addr_type type)
1416{
1417        struct netcp_addr *naddr;
1418
1419        naddr = devm_kmalloc(netcp->dev, sizeof(*naddr), GFP_ATOMIC);
1420        if (!naddr)
1421                return NULL;
1422
1423        naddr->type = type;
1424        naddr->flags = 0;
1425        naddr->netcp = netcp;
1426        if (addr)
1427                ether_addr_copy(naddr->addr, addr);
1428        else
1429                eth_zero_addr(naddr->addr);
1430        list_add_tail(&naddr->node, &netcp->addr_list);
1431
1432        return naddr;
1433}
1434
1435static void netcp_addr_del(struct netcp_intf *netcp, struct netcp_addr *naddr)
1436{
1437        list_del(&naddr->node);
1438        devm_kfree(netcp->dev, naddr);
1439}
1440
1441static void netcp_addr_clear_mark(struct netcp_intf *netcp)
1442{
1443        struct netcp_addr *naddr;
1444
1445        list_for_each_entry(naddr, &netcp->addr_list, node)
1446                naddr->flags = 0;
1447}
1448
1449static void netcp_addr_add_mark(struct netcp_intf *netcp, const u8 *addr,
1450                                enum netcp_addr_type type)
1451{
1452        struct netcp_addr *naddr;
1453
1454        naddr = netcp_addr_find(netcp, addr, type);
1455        if (naddr) {
1456                naddr->flags |= ADDR_VALID;
1457                return;
1458        }
1459
1460        naddr = netcp_addr_add(netcp, addr, type);
1461        if (!WARN_ON(!naddr))
1462                naddr->flags |= ADDR_NEW;
1463}
1464
1465static void netcp_addr_sweep_del(struct netcp_intf *netcp)
1466{
1467        struct netcp_addr *naddr, *tmp;
1468        struct netcp_intf_modpriv *priv;
1469        struct netcp_module *module;
1470        int error;
1471
1472        list_for_each_entry_safe(naddr, tmp, &netcp->addr_list, node) {
1473                if (naddr->flags & (ADDR_VALID | ADDR_NEW))
1474                        continue;
1475                dev_dbg(netcp->ndev_dev, "deleting address %pM, type %x\n",
1476                        naddr->addr, naddr->type);
1477                for_each_module(netcp, priv) {
1478                        module = priv->netcp_module;
1479                        if (!module->del_addr)
1480                                continue;
1481                        error = module->del_addr(priv->module_priv,
1482                                                 naddr);
1483                        WARN_ON(error);
1484                }
1485                netcp_addr_del(netcp, naddr);
1486        }
1487}
1488
1489static void netcp_addr_sweep_add(struct netcp_intf *netcp)
1490{
1491        struct netcp_addr *naddr, *tmp;
1492        struct netcp_intf_modpriv *priv;
1493        struct netcp_module *module;
1494        int error;
1495
1496        list_for_each_entry_safe(naddr, tmp, &netcp->addr_list, node) {
1497                if (!(naddr->flags & ADDR_NEW))
1498                        continue;
1499                dev_dbg(netcp->ndev_dev, "adding address %pM, type %x\n",
1500                        naddr->addr, naddr->type);
1501
1502                for_each_module(netcp, priv) {
1503                        module = priv->netcp_module;
1504                        if (!module->add_addr)
1505                                continue;
1506                        error = module->add_addr(priv->module_priv, naddr);
1507                        WARN_ON(error);
1508                }
1509        }
1510}
1511
1512static int netcp_set_promiscuous(struct netcp_intf *netcp, bool promisc)
1513{
1514        struct netcp_intf_modpriv *priv;
1515        struct netcp_module *module;
1516        int error;
1517
1518        for_each_module(netcp, priv) {
1519                module = priv->netcp_module;
1520                if (!module->set_rx_mode)
1521                        continue;
1522
1523                error = module->set_rx_mode(priv->module_priv, promisc);
1524                if (error)
1525                        return error;
1526        }
1527        return 0;
1528}
1529
1530static void netcp_set_rx_mode(struct net_device *ndev)
1531{
1532        struct netcp_intf *netcp = netdev_priv(ndev);
1533        struct netdev_hw_addr *ndev_addr;
1534        bool promisc;
1535
1536        promisc = (ndev->flags & IFF_PROMISC ||
1537                   ndev->flags & IFF_ALLMULTI ||
1538                   netdev_mc_count(ndev) > NETCP_MAX_MCAST_ADDR);
1539
1540        spin_lock(&netcp->lock);
1541        /* first clear all marks */
1542        netcp_addr_clear_mark(netcp);
1543
1544        /* next add new entries, mark existing ones */
1545        netcp_addr_add_mark(netcp, ndev->broadcast, ADDR_BCAST);
1546        for_each_dev_addr(ndev, ndev_addr)
1547                netcp_addr_add_mark(netcp, ndev_addr->addr, ADDR_DEV);
1548        netdev_for_each_uc_addr(ndev_addr, ndev)
1549                netcp_addr_add_mark(netcp, ndev_addr->addr, ADDR_UCAST);
1550        netdev_for_each_mc_addr(ndev_addr, ndev)
1551                netcp_addr_add_mark(netcp, ndev_addr->addr, ADDR_MCAST);
1552
1553        if (promisc)
1554                netcp_addr_add_mark(netcp, NULL, ADDR_ANY);
1555
1556        /* finally sweep and callout into modules */
1557        netcp_addr_sweep_del(netcp);
1558        netcp_addr_sweep_add(netcp);
1559        netcp_set_promiscuous(netcp, promisc);
1560        spin_unlock(&netcp->lock);
1561}
1562
1563static void netcp_free_navigator_resources(struct netcp_intf *netcp)
1564{
1565        int i;
1566
1567        if (netcp->rx_channel) {
1568                knav_dma_close_channel(netcp->rx_channel);
1569                netcp->rx_channel = NULL;
1570        }
1571
1572        if (!IS_ERR_OR_NULL(netcp->rx_pool))
1573                netcp_rxpool_free(netcp);
1574
1575        if (!IS_ERR_OR_NULL(netcp->rx_queue)) {
1576                knav_queue_close(netcp->rx_queue);
1577                netcp->rx_queue = NULL;
1578        }
1579
1580        for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN &&
1581             !IS_ERR_OR_NULL(netcp->rx_fdq[i]) ; ++i) {
1582                knav_queue_close(netcp->rx_fdq[i]);
1583                netcp->rx_fdq[i] = NULL;
1584        }
1585
1586        if (!IS_ERR_OR_NULL(netcp->tx_compl_q)) {
1587                knav_queue_close(netcp->tx_compl_q);
1588                netcp->tx_compl_q = NULL;
1589        }
1590
1591        if (!IS_ERR_OR_NULL(netcp->tx_pool)) {
1592                knav_pool_destroy(netcp->tx_pool);
1593                netcp->tx_pool = NULL;
1594        }
1595}
1596
1597static int netcp_setup_navigator_resources(struct net_device *ndev)
1598{
1599        struct netcp_intf *netcp = netdev_priv(ndev);
1600        struct knav_queue_notify_config notify_cfg;
1601        struct knav_dma_cfg config;
1602        u32 last_fdq = 0;
1603        u8 name[16];
1604        int ret;
1605        int i;
1606
1607        /* Create Rx/Tx descriptor pools */
1608        snprintf(name, sizeof(name), "rx-pool-%s", ndev->name);
1609        netcp->rx_pool = knav_pool_create(name, netcp->rx_pool_size,
1610                                                netcp->rx_pool_region_id);
1611        if (IS_ERR_OR_NULL(netcp->rx_pool)) {
1612                dev_err(netcp->ndev_dev, "Couldn't create rx pool\n");
1613                ret = PTR_ERR(netcp->rx_pool);
1614                goto fail;
1615        }
1616
1617        snprintf(name, sizeof(name), "tx-pool-%s", ndev->name);
1618        netcp->tx_pool = knav_pool_create(name, netcp->tx_pool_size,
1619                                                netcp->tx_pool_region_id);
1620        if (IS_ERR_OR_NULL(netcp->tx_pool)) {
1621                dev_err(netcp->ndev_dev, "Couldn't create tx pool\n");
1622                ret = PTR_ERR(netcp->tx_pool);
1623                goto fail;
1624        }
1625
1626        /* open Tx completion queue */
1627        snprintf(name, sizeof(name), "tx-compl-%s", ndev->name);
1628        netcp->tx_compl_q = knav_queue_open(name, netcp->tx_compl_qid, 0);
1629        if (IS_ERR(netcp->tx_compl_q)) {
1630                ret = PTR_ERR(netcp->tx_compl_q);
1631                goto fail;
1632        }
1633        netcp->tx_compl_qid = knav_queue_get_id(netcp->tx_compl_q);
1634
1635        /* Set notification for Tx completion */
1636        notify_cfg.fn = netcp_tx_notify;
1637        notify_cfg.fn_arg = netcp;
1638        ret = knav_queue_device_control(netcp->tx_compl_q,
1639                                        KNAV_QUEUE_SET_NOTIFIER,
1640                                        (unsigned long)&notify_cfg);
1641        if (ret)
1642                goto fail;
1643
1644        knav_queue_disable_notify(netcp->tx_compl_q);
1645
1646        /* open Rx completion queue */
1647        snprintf(name, sizeof(name), "rx-compl-%s", ndev->name);
1648        netcp->rx_queue = knav_queue_open(name, netcp->rx_queue_id, 0);
1649        if (IS_ERR(netcp->rx_queue)) {
1650                ret = PTR_ERR(netcp->rx_queue);
1651                goto fail;
1652        }
1653        netcp->rx_queue_id = knav_queue_get_id(netcp->rx_queue);
1654
1655        /* Set notification for Rx completion */
1656        notify_cfg.fn = netcp_rx_notify;
1657        notify_cfg.fn_arg = netcp;
1658        ret = knav_queue_device_control(netcp->rx_queue,
1659                                        KNAV_QUEUE_SET_NOTIFIER,
1660                                        (unsigned long)&notify_cfg);
1661        if (ret)
1662                goto fail;
1663
1664        knav_queue_disable_notify(netcp->rx_queue);
1665
1666        /* open Rx FDQs */
1667        for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN && netcp->rx_queue_depths[i];
1668             ++i) {
1669                snprintf(name, sizeof(name), "rx-fdq-%s-%d", ndev->name, i);
1670                netcp->rx_fdq[i] = knav_queue_open(name, KNAV_QUEUE_GP, 0);
1671                if (IS_ERR(netcp->rx_fdq[i])) {
1672                        ret = PTR_ERR(netcp->rx_fdq[i]);
1673                        goto fail;
1674                }
1675        }
1676
1677        memset(&config, 0, sizeof(config));
1678        config.direction                = DMA_DEV_TO_MEM;
1679        config.u.rx.einfo_present       = true;
1680        config.u.rx.psinfo_present      = true;
1681        config.u.rx.err_mode            = DMA_DROP;
1682        config.u.rx.desc_type           = DMA_DESC_HOST;
1683        config.u.rx.psinfo_at_sop       = false;
1684        config.u.rx.sop_offset          = NETCP_SOP_OFFSET;
1685        config.u.rx.dst_q               = netcp->rx_queue_id;
1686        config.u.rx.thresh              = DMA_THRESH_NONE;
1687
1688        for (i = 0; i < KNAV_DMA_FDQ_PER_CHAN; ++i) {
1689                if (netcp->rx_fdq[i])
1690                        last_fdq = knav_queue_get_id(netcp->rx_fdq[i]);
1691                config.u.rx.fdq[i] = last_fdq;
1692        }
1693
1694        netcp->rx_channel = knav_dma_open_channel(netcp->netcp_device->device,
1695                                        netcp->dma_chan_name, &config);
1696        if (IS_ERR(netcp->rx_channel)) {
1697                dev_err(netcp->ndev_dev, "failed opening rx chan(%s\n",
1698                        netcp->dma_chan_name);
1699                ret = PTR_ERR(netcp->rx_channel);
1700                goto fail;
1701        }
1702
1703        dev_dbg(netcp->ndev_dev, "opened RX channel: %p\n", netcp->rx_channel);
1704        return 0;
1705
1706fail:
1707        netcp_free_navigator_resources(netcp);
1708        return ret;
1709}
1710
1711/* Open the device */
1712static int netcp_ndo_open(struct net_device *ndev)
1713{
1714        struct netcp_intf *netcp = netdev_priv(ndev);
1715        struct netcp_intf_modpriv *intf_modpriv;
1716        struct netcp_module *module;
1717        int ret;
1718
1719        netif_carrier_off(ndev);
1720        ret = netcp_setup_navigator_resources(ndev);
1721        if (ret) {
1722                dev_err(netcp->ndev_dev, "Failed to setup navigator resources\n");
1723                goto fail;
1724        }
1725
1726        for_each_module(netcp, intf_modpriv) {
1727                module = intf_modpriv->netcp_module;
1728                if (module->open) {
1729                        ret = module->open(intf_modpriv->module_priv, ndev);
1730                        if (ret != 0) {
1731                                dev_err(netcp->ndev_dev, "module open failed\n");
1732                                goto fail_open;
1733                        }
1734                }
1735        }
1736
1737        napi_enable(&netcp->rx_napi);
1738        napi_enable(&netcp->tx_napi);
1739        knav_queue_enable_notify(netcp->tx_compl_q);
1740        knav_queue_enable_notify(netcp->rx_queue);
1741        netcp_rxpool_refill(netcp);
1742        netif_tx_wake_all_queues(ndev);
1743        dev_dbg(netcp->ndev_dev, "netcp device %s opened\n", ndev->name);
1744        return 0;
1745
1746fail_open:
1747        for_each_module(netcp, intf_modpriv) {
1748                module = intf_modpriv->netcp_module;
1749                if (module->close)
1750                        module->close(intf_modpriv->module_priv, ndev);
1751        }
1752
1753fail:
1754        netcp_free_navigator_resources(netcp);
1755        return ret;
1756}
1757
1758/* Close the device */
1759static int netcp_ndo_stop(struct net_device *ndev)
1760{
1761        struct netcp_intf *netcp = netdev_priv(ndev);
1762        struct netcp_intf_modpriv *intf_modpriv;
1763        struct netcp_module *module;
1764        int err = 0;
1765
1766        netif_tx_stop_all_queues(ndev);
1767        netif_carrier_off(ndev);
1768        netcp_addr_clear_mark(netcp);
1769        netcp_addr_sweep_del(netcp);
1770        knav_queue_disable_notify(netcp->rx_queue);
1771        knav_queue_disable_notify(netcp->tx_compl_q);
1772        napi_disable(&netcp->rx_napi);
1773        napi_disable(&netcp->tx_napi);
1774
1775        for_each_module(netcp, intf_modpriv) {
1776                module = intf_modpriv->netcp_module;
1777                if (module->close) {
1778                        err = module->close(intf_modpriv->module_priv, ndev);
1779                        if (err != 0)
1780                                dev_err(netcp->ndev_dev, "Close failed\n");
1781                }
1782        }
1783
1784        /* Recycle Rx descriptors from completion queue */
1785        netcp_empty_rx_queue(netcp);
1786
1787        /* Recycle Tx descriptors from completion queue */
1788        netcp_process_tx_compl_packets(netcp, netcp->tx_pool_size);
1789
1790        if (knav_pool_count(netcp->tx_pool) != netcp->tx_pool_size)
1791                dev_err(netcp->ndev_dev, "Lost (%d) Tx descs\n",
1792                        netcp->tx_pool_size - knav_pool_count(netcp->tx_pool));
1793
1794        netcp_free_navigator_resources(netcp);
1795        dev_dbg(netcp->ndev_dev, "netcp device %s stopped\n", ndev->name);
1796        return 0;
1797}
1798
1799static int netcp_ndo_ioctl(struct net_device *ndev,
1800                           struct ifreq *req, int cmd)
1801{
1802        struct netcp_intf *netcp = netdev_priv(ndev);
1803        struct netcp_intf_modpriv *intf_modpriv;
1804        struct netcp_module *module;
1805        int ret = -1, err = -EOPNOTSUPP;
1806
1807        if (!netif_running(ndev))
1808                return -EINVAL;
1809
1810        for_each_module(netcp, intf_modpriv) {
1811                module = intf_modpriv->netcp_module;
1812                if (!module->ioctl)
1813                        continue;
1814
1815                err = module->ioctl(intf_modpriv->module_priv, req, cmd);
1816                if ((err < 0) && (err != -EOPNOTSUPP)) {
1817                        ret = err;
1818                        goto out;
1819                }
1820                if (err == 0)
1821                        ret = err;
1822        }
1823
1824out:
1825        return (ret == 0) ? 0 : err;
1826}
1827
1828static void netcp_ndo_tx_timeout(struct net_device *ndev, unsigned int txqueue)
1829{
1830        struct netcp_intf *netcp = netdev_priv(ndev);
1831        unsigned int descs = knav_pool_count(netcp->tx_pool);
1832
1833        dev_err(netcp->ndev_dev, "transmit timed out tx descs(%d)\n", descs);
1834        netcp_process_tx_compl_packets(netcp, netcp->tx_pool_size);
1835        netif_trans_update(ndev);
1836        netif_tx_wake_all_queues(ndev);
1837}
1838
1839static int netcp_rx_add_vid(struct net_device *ndev, __be16 proto, u16 vid)
1840{
1841        struct netcp_intf *netcp = netdev_priv(ndev);
1842        struct netcp_intf_modpriv *intf_modpriv;
1843        struct netcp_module *module;
1844        unsigned long flags;
1845        int err = 0;
1846
1847        dev_dbg(netcp->ndev_dev, "adding rx vlan id: %d\n", vid);
1848
1849        spin_lock_irqsave(&netcp->lock, flags);
1850        for_each_module(netcp, intf_modpriv) {
1851                module = intf_modpriv->netcp_module;
1852                if ((module->add_vid) && (vid != 0)) {
1853                        err = module->add_vid(intf_modpriv->module_priv, vid);
1854                        if (err != 0) {
1855                                dev_err(netcp->ndev_dev, "Could not add vlan id = %d\n",
1856                                        vid);
1857                                break;
1858                        }
1859                }
1860        }
1861        spin_unlock_irqrestore(&netcp->lock, flags);
1862
1863        return err;
1864}
1865
1866static int netcp_rx_kill_vid(struct net_device *ndev, __be16 proto, u16 vid)
1867{
1868        struct netcp_intf *netcp = netdev_priv(ndev);
1869        struct netcp_intf_modpriv *intf_modpriv;
1870        struct netcp_module *module;
1871        unsigned long flags;
1872        int err = 0;
1873
1874        dev_dbg(netcp->ndev_dev, "removing rx vlan id: %d\n", vid);
1875
1876        spin_lock_irqsave(&netcp->lock, flags);
1877        for_each_module(netcp, intf_modpriv) {
1878                module = intf_modpriv->netcp_module;
1879                if (module->del_vid) {
1880                        err = module->del_vid(intf_modpriv->module_priv, vid);
1881                        if (err != 0) {
1882                                dev_err(netcp->ndev_dev, "Could not delete vlan id = %d\n",
1883                                        vid);
1884                                break;
1885                        }
1886                }
1887        }
1888        spin_unlock_irqrestore(&netcp->lock, flags);
1889        return err;
1890}
1891
1892static int netcp_setup_tc(struct net_device *dev, enum tc_setup_type type,
1893                          void *type_data)
1894{
1895        struct tc_mqprio_qopt *mqprio = type_data;
1896        u8 num_tc;
1897        int i;
1898
1899        /* setup tc must be called under rtnl lock */
1900        ASSERT_RTNL();
1901
1902        if (type != TC_SETUP_QDISC_MQPRIO)
1903                return -EOPNOTSUPP;
1904
1905        mqprio->hw = TC_MQPRIO_HW_OFFLOAD_TCS;
1906        num_tc = mqprio->num_tc;
1907
1908        /* Sanity-check the number of traffic classes requested */
1909        if ((dev->real_num_tx_queues <= 1) ||
1910            (dev->real_num_tx_queues < num_tc))
1911                return -EINVAL;
1912
1913        /* Configure traffic class to queue mappings */
1914        if (num_tc) {
1915                netdev_set_num_tc(dev, num_tc);
1916                for (i = 0; i < num_tc; i++)
1917                        netdev_set_tc_queue(dev, i, 1, i);
1918        } else {
1919                netdev_reset_tc(dev);
1920        }
1921
1922        return 0;
1923}
1924
1925static void
1926netcp_get_stats(struct net_device *ndev, struct rtnl_link_stats64 *stats)
1927{
1928        struct netcp_intf *netcp = netdev_priv(ndev);
1929        struct netcp_stats *p = &netcp->stats;
1930        u64 rxpackets, rxbytes, txpackets, txbytes;
1931        unsigned int start;
1932
1933        do {
1934                start = u64_stats_fetch_begin_irq(&p->syncp_rx);
1935                rxpackets       = p->rx_packets;
1936                rxbytes         = p->rx_bytes;
1937        } while (u64_stats_fetch_retry_irq(&p->syncp_rx, start));
1938
1939        do {
1940                start = u64_stats_fetch_begin_irq(&p->syncp_tx);
1941                txpackets       = p->tx_packets;
1942                txbytes         = p->tx_bytes;
1943        } while (u64_stats_fetch_retry_irq(&p->syncp_tx, start));
1944
1945        stats->rx_packets = rxpackets;
1946        stats->rx_bytes = rxbytes;
1947        stats->tx_packets = txpackets;
1948        stats->tx_bytes = txbytes;
1949
1950        /* The following are stored as 32 bit */
1951        stats->rx_errors = p->rx_errors;
1952        stats->rx_dropped = p->rx_dropped;
1953        stats->tx_dropped = p->tx_dropped;
1954}
1955
1956static const struct net_device_ops netcp_netdev_ops = {
1957        .ndo_open               = netcp_ndo_open,
1958        .ndo_stop               = netcp_ndo_stop,
1959        .ndo_start_xmit         = netcp_ndo_start_xmit,
1960        .ndo_set_rx_mode        = netcp_set_rx_mode,
1961        .ndo_do_ioctl           = netcp_ndo_ioctl,
1962        .ndo_get_stats64        = netcp_get_stats,
1963        .ndo_set_mac_address    = eth_mac_addr,
1964        .ndo_validate_addr      = eth_validate_addr,
1965        .ndo_vlan_rx_add_vid    = netcp_rx_add_vid,
1966        .ndo_vlan_rx_kill_vid   = netcp_rx_kill_vid,
1967        .ndo_tx_timeout         = netcp_ndo_tx_timeout,
1968        .ndo_select_queue       = dev_pick_tx_zero,
1969        .ndo_setup_tc           = netcp_setup_tc,
1970};
1971
1972static int netcp_create_interface(struct netcp_device *netcp_device,
1973                                  struct device_node *node_interface)
1974{
1975        struct device *dev = netcp_device->device;
1976        struct device_node *node = dev->of_node;
1977        struct netcp_intf *netcp;
1978        struct net_device *ndev;
1979        resource_size_t size;
1980        struct resource res;
1981        void __iomem *efuse = NULL;
1982        u32 efuse_mac = 0;
1983        const void *mac_addr;
1984        u8 efuse_mac_addr[6];
1985        u32 temp[2];
1986        int ret = 0;
1987
1988        ndev = alloc_etherdev_mqs(sizeof(*netcp), 1, 1);
1989        if (!ndev) {
1990                dev_err(dev, "Error allocating netdev\n");
1991                return -ENOMEM;
1992        }
1993
1994        ndev->features |= NETIF_F_SG;
1995        ndev->features |= NETIF_F_HW_VLAN_CTAG_FILTER;
1996        ndev->hw_features = ndev->features;
1997        ndev->vlan_features |=  NETIF_F_SG;
1998
1999        /* MTU range: 68 - 9486 */
2000        ndev->min_mtu = ETH_MIN_MTU;
2001        ndev->max_mtu = NETCP_MAX_FRAME_SIZE - (ETH_HLEN + ETH_FCS_LEN);
2002
2003        netcp = netdev_priv(ndev);
2004        spin_lock_init(&netcp->lock);
2005        INIT_LIST_HEAD(&netcp->module_head);
2006        INIT_LIST_HEAD(&netcp->txhook_list_head);
2007        INIT_LIST_HEAD(&netcp->rxhook_list_head);
2008        INIT_LIST_HEAD(&netcp->addr_list);
2009        u64_stats_init(&netcp->stats.syncp_rx);
2010        u64_stats_init(&netcp->stats.syncp_tx);
2011        netcp->netcp_device = netcp_device;
2012        netcp->dev = netcp_device->device;
2013        netcp->ndev = ndev;
2014        netcp->ndev_dev  = &ndev->dev;
2015        netcp->msg_enable = netif_msg_init(netcp_debug_level, NETCP_DEBUG);
2016        netcp->tx_pause_threshold = MAX_SKB_FRAGS;
2017        netcp->tx_resume_threshold = netcp->tx_pause_threshold;
2018        netcp->node_interface = node_interface;
2019
2020        ret = of_property_read_u32(node_interface, "efuse-mac", &efuse_mac);
2021        if (efuse_mac) {
2022                if (of_address_to_resource(node, NETCP_EFUSE_REG_INDEX, &res)) {
2023                        dev_err(dev, "could not find efuse-mac reg resource\n");
2024                        ret = -ENODEV;
2025                        goto quit;
2026                }
2027                size = resource_size(&res);
2028
2029                if (!devm_request_mem_region(dev, res.start, size,
2030                                             dev_name(dev))) {
2031                        dev_err(dev, "could not reserve resource\n");
2032                        ret = -ENOMEM;
2033                        goto quit;
2034                }
2035
2036                efuse = devm_ioremap_nocache(dev, res.start, size);
2037                if (!efuse) {
2038                        dev_err(dev, "could not map resource\n");
2039                        devm_release_mem_region(dev, res.start, size);
2040                        ret = -ENOMEM;
2041                        goto quit;
2042                }
2043
2044                emac_arch_get_mac_addr(efuse_mac_addr, efuse, efuse_mac);
2045                if (is_valid_ether_addr(efuse_mac_addr))
2046                        ether_addr_copy(ndev->dev_addr, efuse_mac_addr);
2047                else
2048                        random_ether_addr(ndev->dev_addr);
2049
2050                devm_iounmap(dev, efuse);
2051                devm_release_mem_region(dev, res.start, size);
2052        } else {
2053                mac_addr = of_get_mac_address(node_interface);
2054                if (mac_addr)
2055                        ether_addr_copy(ndev->dev_addr, mac_addr);
2056                else
2057                        random_ether_addr(ndev->dev_addr);
2058        }
2059
2060        ret = of_property_read_string(node_interface, "rx-channel",
2061                                      &netcp->dma_chan_name);
2062        if (ret < 0) {
2063                dev_err(dev, "missing \"rx-channel\" parameter\n");
2064                ret = -ENODEV;
2065                goto quit;
2066        }
2067
2068        ret = of_property_read_u32(node_interface, "rx-queue",
2069                                   &netcp->rx_queue_id);
2070        if (ret < 0) {
2071                dev_warn(dev, "missing \"rx-queue\" parameter\n");
2072                netcp->rx_queue_id = KNAV_QUEUE_QPEND;
2073        }
2074
2075        ret = of_property_read_u32_array(node_interface, "rx-queue-depth",
2076                                         netcp->rx_queue_depths,
2077                                         KNAV_DMA_FDQ_PER_CHAN);
2078        if (ret < 0) {
2079                dev_err(dev, "missing \"rx-queue-depth\" parameter\n");
2080                netcp->rx_queue_depths[0] = 128;
2081        }
2082
2083        ret = of_property_read_u32_array(node_interface, "rx-pool", temp, 2);
2084        if (ret < 0) {
2085                dev_err(dev, "missing \"rx-pool\" parameter\n");
2086                ret = -ENODEV;
2087                goto quit;
2088        }
2089        netcp->rx_pool_size = temp[0];
2090        netcp->rx_pool_region_id = temp[1];
2091
2092        ret = of_property_read_u32_array(node_interface, "tx-pool", temp, 2);
2093        if (ret < 0) {
2094                dev_err(dev, "missing \"tx-pool\" parameter\n");
2095                ret = -ENODEV;
2096                goto quit;
2097        }
2098        netcp->tx_pool_size = temp[0];
2099        netcp->tx_pool_region_id = temp[1];
2100
2101        if (netcp->tx_pool_size < MAX_SKB_FRAGS) {
2102                dev_err(dev, "tx-pool size too small, must be atleast(%ld)\n",
2103                        MAX_SKB_FRAGS);
2104                ret = -ENODEV;
2105                goto quit;
2106        }
2107
2108        ret = of_property_read_u32(node_interface, "tx-completion-queue",
2109                                   &netcp->tx_compl_qid);
2110        if (ret < 0) {
2111                dev_warn(dev, "missing \"tx-completion-queue\" parameter\n");
2112                netcp->tx_compl_qid = KNAV_QUEUE_QPEND;
2113        }
2114
2115        /* NAPI register */
2116        netif_napi_add(ndev, &netcp->rx_napi, netcp_rx_poll, NETCP_NAPI_WEIGHT);
2117        netif_tx_napi_add(ndev, &netcp->tx_napi, netcp_tx_poll, NETCP_NAPI_WEIGHT);
2118
2119        /* Register the network device */
2120        ndev->dev_id            = 0;
2121        ndev->watchdog_timeo    = NETCP_TX_TIMEOUT;
2122        ndev->netdev_ops        = &netcp_netdev_ops;
2123        SET_NETDEV_DEV(ndev, dev);
2124
2125        list_add_tail(&netcp->interface_list, &netcp_device->interface_head);
2126        return 0;
2127
2128quit:
2129        free_netdev(ndev);
2130        return ret;
2131}
2132
2133static void netcp_delete_interface(struct netcp_device *netcp_device,
2134                                   struct net_device *ndev)
2135{
2136        struct netcp_intf_modpriv *intf_modpriv, *tmp;
2137        struct netcp_intf *netcp = netdev_priv(ndev);
2138        struct netcp_module *module;
2139
2140        dev_dbg(netcp_device->device, "Removing interface \"%s\"\n",
2141                ndev->name);
2142
2143        /* Notify each of the modules that the interface is going away */
2144        list_for_each_entry_safe(intf_modpriv, tmp, &netcp->module_head,
2145                                 intf_list) {
2146                module = intf_modpriv->netcp_module;
2147                dev_dbg(netcp_device->device, "Releasing module \"%s\"\n",
2148                        module->name);
2149                if (module->release)
2150                        module->release(intf_modpriv->module_priv);
2151                list_del(&intf_modpriv->intf_list);
2152        }
2153        WARN(!list_empty(&netcp->module_head), "%s interface module list is not empty!\n",
2154             ndev->name);
2155
2156        list_del(&netcp->interface_list);
2157
2158        of_node_put(netcp->node_interface);
2159        unregister_netdev(ndev);
2160        free_netdev(ndev);
2161}
2162
2163static int netcp_probe(struct platform_device *pdev)
2164{
2165        struct device_node *node = pdev->dev.of_node;
2166        struct netcp_intf *netcp_intf, *netcp_tmp;
2167        struct device_node *child, *interfaces;
2168        struct netcp_device *netcp_device;
2169        struct device *dev = &pdev->dev;
2170        struct netcp_module *module;
2171        int ret;
2172
2173        if (!knav_dma_device_ready() ||
2174            !knav_qmss_device_ready())
2175                return -EPROBE_DEFER;
2176
2177        if (!node) {
2178                dev_err(dev, "could not find device info\n");
2179                return -ENODEV;
2180        }
2181
2182        /* Allocate a new NETCP device instance */
2183        netcp_device = devm_kzalloc(dev, sizeof(*netcp_device), GFP_KERNEL);
2184        if (!netcp_device)
2185                return -ENOMEM;
2186
2187        pm_runtime_enable(&pdev->dev);
2188        ret = pm_runtime_get_sync(&pdev->dev);
2189        if (ret < 0) {
2190                dev_err(dev, "Failed to enable NETCP power-domain\n");
2191                pm_runtime_disable(&pdev->dev);
2192                return ret;
2193        }
2194
2195        /* Initialize the NETCP device instance */
2196        INIT_LIST_HEAD(&netcp_device->interface_head);
2197        INIT_LIST_HEAD(&netcp_device->modpriv_head);
2198        netcp_device->device = dev;
2199        platform_set_drvdata(pdev, netcp_device);
2200
2201        /* create interfaces */
2202        interfaces = of_get_child_by_name(node, "netcp-interfaces");
2203        if (!interfaces) {
2204                dev_err(dev, "could not find netcp-interfaces node\n");
2205                ret = -ENODEV;
2206                goto probe_quit;
2207        }
2208
2209        for_each_available_child_of_node(interfaces, child) {
2210                ret = netcp_create_interface(netcp_device, child);
2211                if (ret) {
2212                        dev_err(dev, "could not create interface(%s)\n",
2213                                child->name);
2214                        goto probe_quit_interface;
2215                }
2216        }
2217
2218        of_node_put(interfaces);
2219
2220        /* Add the device instance to the list */
2221        list_add_tail(&netcp_device->device_list, &netcp_devices);
2222
2223        /* Probe & attach any modules already registered */
2224        mutex_lock(&netcp_modules_lock);
2225        for_each_netcp_module(module) {
2226                ret = netcp_module_probe(netcp_device, module);
2227                if (ret < 0)
2228                        dev_err(dev, "module(%s) probe failed\n", module->name);
2229        }
2230        mutex_unlock(&netcp_modules_lock);
2231        return 0;
2232
2233probe_quit_interface:
2234        list_for_each_entry_safe(netcp_intf, netcp_tmp,
2235                                 &netcp_device->interface_head,
2236                                 interface_list) {
2237                netcp_delete_interface(netcp_device, netcp_intf->ndev);
2238        }
2239
2240        of_node_put(interfaces);
2241
2242probe_quit:
2243        pm_runtime_put_sync(&pdev->dev);
2244        pm_runtime_disable(&pdev->dev);
2245        platform_set_drvdata(pdev, NULL);
2246        return ret;
2247}
2248
2249static int netcp_remove(struct platform_device *pdev)
2250{
2251        struct netcp_device *netcp_device = platform_get_drvdata(pdev);
2252        struct netcp_intf *netcp_intf, *netcp_tmp;
2253        struct netcp_inst_modpriv *inst_modpriv, *tmp;
2254        struct netcp_module *module;
2255
2256        list_for_each_entry_safe(inst_modpriv, tmp, &netcp_device->modpriv_head,
2257                                 inst_list) {
2258                module = inst_modpriv->netcp_module;
2259                dev_dbg(&pdev->dev, "Removing module \"%s\"\n", module->name);
2260                module->remove(netcp_device, inst_modpriv->module_priv);
2261                list_del(&inst_modpriv->inst_list);
2262        }
2263
2264        /* now that all modules are removed, clean up the interfaces */
2265        list_for_each_entry_safe(netcp_intf, netcp_tmp,
2266                                 &netcp_device->interface_head,
2267                                 interface_list) {
2268                netcp_delete_interface(netcp_device, netcp_intf->ndev);
2269        }
2270
2271        WARN(!list_empty(&netcp_device->interface_head),
2272             "%s interface list not empty!\n", pdev->name);
2273
2274        pm_runtime_put_sync(&pdev->dev);
2275        pm_runtime_disable(&pdev->dev);
2276        platform_set_drvdata(pdev, NULL);
2277        return 0;
2278}
2279
2280static const struct of_device_id of_match[] = {
2281        { .compatible = "ti,netcp-1.0", },
2282        {},
2283};
2284MODULE_DEVICE_TABLE(of, of_match);
2285
2286static struct platform_driver netcp_driver = {
2287        .driver = {
2288                .name           = "netcp-1.0",
2289                .of_match_table = of_match,
2290        },
2291        .probe = netcp_probe,
2292        .remove = netcp_remove,
2293};
2294module_platform_driver(netcp_driver);
2295
2296MODULE_LICENSE("GPL v2");
2297MODULE_DESCRIPTION("TI NETCP driver for Keystone SOCs");
2298MODULE_AUTHOR("Sandeep Nair <sandeep_n@ti.com");
2299