LXR linux/drivers/infiniband/ulp/opa_vnic/opa_vnic

   1/*
   2 * Copyright(c) 2017 Intel Corporation.
   3 *
   4 * This file is provided under a dual BSD/GPLv2 license.  When using or
   5 * redistributing this file, you may do so under either license.
   6 *
   7 * GPL LICENSE SUMMARY
   8 *
   9 * This program is free software; you can redistribute it and/or modify
  10 * it under the terms of version 2 of the GNU General Public License as
  11 * published by the Free Software Foundation.
  12 *
  13 * This program is distributed in the hope that it will be useful, but
  14 * WITHOUT ANY WARRANTY; without even the implied warranty of
  15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 * General Public License for more details.
  17 *
  18 * BSD LICENSE
  19 *
  20 * Redistribution and use in source and binary forms, with or without
  21 * modification, are permitted provided that the following conditions
  22 * are met:
  23 *
  24 *  - Redistributions of source code must retain the above copyright
  25 *    notice, this list of conditions and the following disclaimer.
  26 *  - Redistributions in binary form must reproduce the above copyright
  27 *    notice, this list of conditions and the following disclaimer in
  28 *    the documentation and/or other materials provided with the
  29 *    distribution.
  30 *  - Neither the name of Intel Corporation nor the names of its
  31 *    contributors may be used to endorse or promote products derived
  32 *    from this software without specific prior written permission.
  33 *
  34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  44 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  45 *
  46 */
  47
  48/*
  49 * This file contains OPA Virtual Network Interface Controller (VNIC) driver
  50 * netdev functionality.
  51 */
  52
  53#include <linux/module.h>
  54#include <linux/if_vlan.h>
  55#include <linux/crc32.h>
  56
  57#include "opa_vnic_internal.h"
  58
  59#define OPA_TX_TIMEOUT_MS 1000
  60
  61#define OPA_VNIC_SKB_HEADROOM  \
  62                        ALIGN((OPA_VNIC_HDR_LEN + OPA_VNIC_SKB_MDATA_LEN), 8)
  63
  64/* This function is overloaded for opa_vnic specific implementation */
  65static void opa_vnic_get_stats64(struct net_device *netdev,
  66                                 struct rtnl_link_stats64 *stats)
  67{
  68        struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
  69        struct opa_vnic_stats vstats;
  70
  71        memset(&vstats, 0, sizeof(vstats));
  72        spin_lock(&adapter->stats_lock);
  73        adapter->rn_ops->ndo_get_stats64(netdev, &vstats.netstats);
  74        spin_unlock(&adapter->stats_lock);
  75        memcpy(stats, &vstats.netstats, sizeof(*stats));
  76}
  77
  78/* opa_netdev_start_xmit - transmit function */
  79static netdev_tx_t opa_netdev_start_xmit(struct sk_buff *skb,
  80                                         struct net_device *netdev)
  81{
  82        struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
  83
  84        v_dbg("xmit: queue %d skb len %d\n", skb->queue_mapping, skb->len);
  85        /* pad to ensure mininum ethernet packet length */
  86        if (unlikely(skb->len < ETH_ZLEN)) {
  87                if (skb_padto(skb, ETH_ZLEN))
  88                        return NETDEV_TX_OK;
  89
  90                skb_put(skb, ETH_ZLEN - skb->len);
  91        }
  92
  93        opa_vnic_encap_skb(adapter, skb);
  94        return adapter->rn_ops->ndo_start_xmit(skb, netdev);
  95}
  96
  97static u16 opa_vnic_select_queue(struct net_device *netdev, struct sk_buff *skb,
  98                                 struct net_device *sb_dev)
  99{
 100        struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
 101        struct opa_vnic_skb_mdata *mdata;
 102        int rc;
 103
 104        /* pass entropy and vl as metadata in skb */
 105        mdata = skb_push(skb, sizeof(*mdata));
 106        mdata->entropy = opa_vnic_calc_entropy(skb);
 107        mdata->vl = opa_vnic_get_vl(adapter, skb);
 108        rc = adapter->rn_ops->ndo_select_queue(netdev, skb, sb_dev);
 109        skb_pull(skb, sizeof(*mdata));
 110        return rc;
 111}
 112
 113static void opa_vnic_update_state(struct opa_vnic_adapter *adapter, bool up)
 114{
 115        struct __opa_veswport_info *info = &adapter->info;
 116
 117        mutex_lock(&adapter->lock);
 118        /* Operational state can only be DROP_ALL or FORWARDING */
 119        if ((info->vport.config_state == OPA_VNIC_STATE_FORWARDING) && up) {
 120                info->vport.oper_state = OPA_VNIC_STATE_FORWARDING;
 121                info->vport.eth_link_status = OPA_VNIC_ETH_LINK_UP;
 122        } else {
 123                info->vport.oper_state = OPA_VNIC_STATE_DROP_ALL;
 124                info->vport.eth_link_status = OPA_VNIC_ETH_LINK_DOWN;
 125        }
 126
 127        if (info->vport.config_state == OPA_VNIC_STATE_FORWARDING)
 128                netif_dormant_off(adapter->netdev);
 129        else
 130                netif_dormant_on(adapter->netdev);
 131        mutex_unlock(&adapter->lock);
 132}
 133
 134/* opa_vnic_process_vema_config - process vema configuration updates */
 135void opa_vnic_process_vema_config(struct opa_vnic_adapter *adapter)
 136{
 137        struct __opa_veswport_info *info = &adapter->info;
 138        struct rdma_netdev *rn = netdev_priv(adapter->netdev);
 139        u8 port_num[OPA_VESW_MAX_NUM_DEF_PORT] = { 0 };
 140        struct net_device *netdev = adapter->netdev;
 141        u8 i, port_count = 0;
 142        u16 port_mask;
 143
 144        /* If the base_mac_addr is changed, update the interface mac address */
 145        if (memcmp(info->vport.base_mac_addr, adapter->vema_mac_addr,
 146                   ARRAY_SIZE(info->vport.base_mac_addr))) {
 147                struct sockaddr saddr;
 148
 149                memcpy(saddr.sa_data, info->vport.base_mac_addr,
 150                       ARRAY_SIZE(info->vport.base_mac_addr));
 151                mutex_lock(&adapter->lock);
 152                eth_commit_mac_addr_change(netdev, &saddr);
 153                memcpy(adapter->vema_mac_addr,
 154                       info->vport.base_mac_addr, ETH_ALEN);
 155                mutex_unlock(&adapter->lock);
 156        }
 157
 158        rn->set_id(netdev, info->vesw.vesw_id);
 159
 160        /* Handle MTU limit change */
 161        rtnl_lock();
 162        netdev->max_mtu = max_t(unsigned int, info->vesw.eth_mtu,
 163                                netdev->min_mtu);
 164        if (netdev->mtu > netdev->max_mtu)
 165                dev_set_mtu(netdev, netdev->max_mtu);
 166        rtnl_unlock();
 167
 168        /* Update flow to default port redirection table */
 169        port_mask = info->vesw.def_port_mask;
 170        for (i = 0; i < OPA_VESW_MAX_NUM_DEF_PORT; i++) {
 171                if (port_mask & 1)
 172                        port_num[port_count++] = i;
 173                port_mask >>= 1;
 174        }
 175
 176        /*
 177         * Build the flow table. Flow table is required when destination LID
 178         * is not available. Up to OPA_VNIC_FLOW_TBL_SIZE flows supported.
 179         * Each flow need a default port number to get its dlid from the
 180         * u_ucast_dlid array.
 181         */
 182        for (i = 0; i < OPA_VNIC_FLOW_TBL_SIZE; i++)
 183                adapter->flow_tbl[i] = port_count ? port_num[i % port_count] :
 184                                                    OPA_VNIC_INVALID_PORT;
 185
 186        /* update state */
 187        opa_vnic_update_state(adapter, !!(netdev->flags & IFF_UP));
 188}
 189
 190/*
 191 * Set the power on default values in adapter's vema interface structure.
 192 */
 193static inline void opa_vnic_set_pod_values(struct opa_vnic_adapter *adapter)
 194{
 195        adapter->info.vport.max_mac_tbl_ent = OPA_VNIC_MAC_TBL_MAX_ENTRIES;
 196        adapter->info.vport.max_smac_ent = OPA_VNIC_MAX_SMAC_LIMIT;
 197        adapter->info.vport.config_state = OPA_VNIC_STATE_DROP_ALL;
 198        adapter->info.vport.eth_link_status = OPA_VNIC_ETH_LINK_DOWN;
 199        adapter->info.vesw.eth_mtu = ETH_DATA_LEN;
 200}
 201
 202/* opa_vnic_set_mac_addr - change mac address */
 203static int opa_vnic_set_mac_addr(struct net_device *netdev, void *addr)
 204{
 205        struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
 206        struct sockaddr *sa = addr;
 207        int rc;
 208
 209        if (!memcmp(netdev->dev_addr, sa->sa_data, ETH_ALEN))
 210                return 0;
 211
 212        mutex_lock(&adapter->lock);
 213        rc = eth_mac_addr(netdev, addr);
 214        mutex_unlock(&adapter->lock);
 215        if (rc)
 216                return rc;
 217
 218        adapter->info.vport.uc_macs_gen_count++;
 219        opa_vnic_vema_report_event(adapter,
 220                                   OPA_VESWPORT_TRAP_IFACE_UCAST_MAC_CHANGE);
 221        return 0;
 222}
 223
 224/*
 225 * opa_vnic_mac_send_event - post event on possible mac list exchange
 226 *  Send trap when digest from uc/mc mac list differs from previous run.
 227 *  Digest is evaluated similar to how cksum does.
 228 */
 229static void opa_vnic_mac_send_event(struct net_device *netdev, u8 event)
 230{
 231        struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
 232        struct netdev_hw_addr *ha;
 233        struct netdev_hw_addr_list *hw_list;
 234        u32 *ref_crc;
 235        u32 l, crc = 0;
 236
 237        switch (event) {
 238        case OPA_VESWPORT_TRAP_IFACE_UCAST_MAC_CHANGE:
 239                hw_list = &netdev->uc;
 240                adapter->info.vport.uc_macs_gen_count++;
 241                ref_crc = &adapter->umac_hash;
 242                break;
 243        case OPA_VESWPORT_TRAP_IFACE_MCAST_MAC_CHANGE:
 244                hw_list = &netdev->mc;
 245                adapter->info.vport.mc_macs_gen_count++;
 246                ref_crc = &adapter->mmac_hash;
 247                break;
 248        default:
 249                return;
 250        }
 251        netdev_hw_addr_list_for_each(ha, hw_list) {
 252                crc = crc32_le(crc, ha->addr, ETH_ALEN);
 253        }
 254        l = netdev_hw_addr_list_count(hw_list) * ETH_ALEN;
 255        crc = ~crc32_le(crc, (void *)&l, sizeof(l));
 256
 257        if (crc != *ref_crc) {
 258                *ref_crc = crc;
 259                opa_vnic_vema_report_event(adapter, event);
 260        }
 261}
 262
 263/* opa_vnic_set_rx_mode - handle uc/mc mac list change */
 264static void opa_vnic_set_rx_mode(struct net_device *netdev)
 265{
 266        opa_vnic_mac_send_event(netdev,
 267                                OPA_VESWPORT_TRAP_IFACE_UCAST_MAC_CHANGE);
 268
 269        opa_vnic_mac_send_event(netdev,
 270                                OPA_VESWPORT_TRAP_IFACE_MCAST_MAC_CHANGE);
 271}
 272
 273/* opa_netdev_open - activate network interface */
 274static int opa_netdev_open(struct net_device *netdev)
 275{
 276        struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
 277        int rc;
 278
 279        rc = adapter->rn_ops->ndo_open(adapter->netdev);
 280        if (rc) {
 281                v_dbg("open failed %d\n", rc);
 282                return rc;
 283        }
 284
 285        /* Update status and send trap */
 286        opa_vnic_update_state(adapter, true);
 287        opa_vnic_vema_report_event(adapter,
 288                                   OPA_VESWPORT_TRAP_ETH_LINK_STATUS_CHANGE);
 289        return 0;
 290}
 291
 292/* opa_netdev_close - disable network interface */
 293static int opa_netdev_close(struct net_device *netdev)
 294{
 295        struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
 296        int rc;
 297
 298        rc = adapter->rn_ops->ndo_stop(adapter->netdev);
 299        if (rc) {
 300                v_dbg("close failed %d\n", rc);
 301                return rc;
 302        }
 303
 304        /* Update status and send trap */
 305        opa_vnic_update_state(adapter, false);
 306        opa_vnic_vema_report_event(adapter,
 307                                   OPA_VESWPORT_TRAP_ETH_LINK_STATUS_CHANGE);
 308        return 0;
 309}
 310
 311/* netdev ops */
 312static const struct net_device_ops opa_netdev_ops = {
 313        .ndo_open = opa_netdev_open,
 314        .ndo_stop = opa_netdev_close,
 315        .ndo_start_xmit = opa_netdev_start_xmit,
 316        .ndo_get_stats64 = opa_vnic_get_stats64,
 317        .ndo_set_rx_mode = opa_vnic_set_rx_mode,
 318        .ndo_select_queue = opa_vnic_select_queue,
 319        .ndo_set_mac_address = opa_vnic_set_mac_addr,
 320};
 321
 322/* opa_vnic_add_netdev - create vnic netdev interface */
 323struct opa_vnic_adapter *opa_vnic_add_netdev(struct ib_device *ibdev,
 324                                             u8 port_num, u8 vport_num)
 325{
 326        struct opa_vnic_adapter *adapter;
 327        struct net_device *netdev;
 328        struct rdma_netdev *rn;
 329        int rc;
 330
 331        netdev = ibdev->ops.alloc_rdma_netdev(ibdev, port_num,
 332                                              RDMA_NETDEV_OPA_VNIC,
 333                                              "veth%d", NET_NAME_UNKNOWN,
 334                                              ether_setup);
 335        if (!netdev)
 336                return ERR_PTR(-ENOMEM);
 337        else if (IS_ERR(netdev))
 338                return ERR_CAST(netdev);
 339
 340        rn = netdev_priv(netdev);
 341        adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
 342        if (!adapter) {
 343                rc = -ENOMEM;
 344                goto adapter_err;
 345        }
 346
 347        rn->clnt_priv = adapter;
 348        rn->hca = ibdev;
 349        rn->port_num = port_num;
 350        adapter->netdev = netdev;
 351        adapter->ibdev = ibdev;
 352        adapter->port_num = port_num;
 353        adapter->vport_num = vport_num;
 354        adapter->rn_ops = netdev->netdev_ops;
 355
 356        netdev->netdev_ops = &opa_netdev_ops;
 357        netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
 358        netdev->hard_header_len += OPA_VNIC_SKB_HEADROOM;
 359        mutex_init(&adapter->lock);
 360        mutex_init(&adapter->mactbl_lock);
 361        spin_lock_init(&adapter->stats_lock);
 362
 363        SET_NETDEV_DEV(netdev, ibdev->dev.parent);
 364
 365        opa_vnic_set_ethtool_ops(netdev);
 366
 367        opa_vnic_set_pod_values(adapter);
 368
 369        rc = register_netdev(netdev);
 370        if (rc)
 371                goto netdev_err;
 372
 373        netif_carrier_off(netdev);
 374        netif_dormant_on(netdev);
 375        v_info("initialized\n");
 376
 377        return adapter;
 378netdev_err:
 379        mutex_destroy(&adapter->lock);
 380        mutex_destroy(&adapter->mactbl_lock);
 381        kfree(adapter);
 382adapter_err:
 383        rn->free_rdma_netdev(netdev);
 384
 385        return ERR_PTR(rc);
 386}
 387
 388/* opa_vnic_rem_netdev - remove vnic netdev interface */
 389void opa_vnic_rem_netdev(struct opa_vnic_adapter *adapter)
 390{
 391        struct net_device *netdev = adapter->netdev;
 392        struct rdma_netdev *rn = netdev_priv(netdev);
 393
 394        v_info("removing\n");
 395        unregister_netdev(netdev);
 396        opa_vnic_release_mac_tbl(adapter);
 397        mutex_destroy(&adapter->lock);
 398        mutex_destroy(&adapter->mactbl_lock);
 399        kfree(adapter);
 400        rn->free_rdma_netdev(netdev);
 401}
 402