drivers/infiniband/ulp/opa_vnic/opa_vnic_netdev.c

   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/if_vlan.h>
  54 #include <linux/crc32.h>
  55
  56 #include "opa_vnic_internal.h"
  57
  58 #define OPA_TX_TIMEOUT_MS 1000
  59
  60 #define OPA_VNIC_SKB_HEADROOM  \
  61                         ALIGN((OPA_VNIC_HDR_LEN + OPA_VNIC_SKB_MDATA_LEN), 8)
  62
  63 /* This function is overloaded for opa_vnic specific implementation */
  64 static void opa_vnic_get_stats64(struct net_device *netdev,
  65                                  struct rtnl_link_stats64 *stats)
  66 {
  67         struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
  68         struct opa_vnic_stats vstats;
  69
  70         memset(&vstats, 0, sizeof(vstats));
  71         spin_lock(&adapter->stats_lock);
  72         adapter->rn_ops->ndo_get_stats64(netdev, &vstats.netstats);
  73         spin_unlock(&adapter->stats_lock);
  74         memcpy(stats, &vstats.netstats, sizeof(*stats));
  75 }
  76
  77 /* opa_netdev_start_xmit - transmit function */
  78 static netdev_tx_t opa_netdev_start_xmit(struct sk_buff *skb,
  79                                          struct net_device *netdev)
  80 {
  81         struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
  82
  83         v_dbg("xmit: queue %d skb len %d\n", skb->queue_mapping, skb->len);
  84         /* pad to ensure mininum ethernet packet length */
  85         if (unlikely(skb->len < ETH_ZLEN)) {
  86                 if (skb_padto(skb, ETH_ZLEN))
  87                         return NETDEV_TX_OK;
  88
  89                 skb_put(skb, ETH_ZLEN - skb->len);
  90         }
  91
  92         opa_vnic_encap_skb(adapter, skb);
  93         return adapter->rn_ops->ndo_start_xmit(skb, netdev);
  94 }
  95
  96 static u16 opa_vnic_select_queue(struct net_device *netdev, struct sk_buff *skb,
  97                                  struct net_device *sb_dev)
  98 {
  99         struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
 100         struct opa_vnic_skb_mdata *mdata;
 101         int rc;
 102
 103         /* pass entropy and vl as metadata in skb */
 104         mdata = skb_push(skb, sizeof(*mdata));
 105         mdata->entropy = opa_vnic_calc_entropy(skb);
 106         mdata->vl = opa_vnic_get_vl(adapter, skb);
 107         rc = adapter->rn_ops->ndo_select_queue(netdev, skb, sb_dev);
 108         skb_pull(skb, sizeof(*mdata));
 109         return rc;
 110 }
 111
 112 static void opa_vnic_update_state(struct opa_vnic_adapter *adapter, bool up)
 113 {
 114         struct __opa_veswport_info *info = &adapter->info;
 115
 116         mutex_lock(&adapter->lock);
 117         /* Operational state can only be DROP_ALL or FORWARDING */
 118         if ((info->vport.config_state == OPA_VNIC_STATE_FORWARDING) && up) {
 119                 info->vport.oper_state = OPA_VNIC_STATE_FORWARDING;
 120                 info->vport.eth_link_status = OPA_VNIC_ETH_LINK_UP;
 121         } else {
 122                 info->vport.oper_state = OPA_VNIC_STATE_DROP_ALL;
 123                 info->vport.eth_link_status = OPA_VNIC_ETH_LINK_DOWN;
 124         }
 125
 126         if (info->vport.config_state == OPA_VNIC_STATE_FORWARDING)
 127                 netif_dormant_off(adapter->netdev);
 128         else
 129                 netif_dormant_on(adapter->netdev);
 130         mutex_unlock(&adapter->lock);
 131 }
 132
 133 /* opa_vnic_process_vema_config - process vema configuration updates */
 134 void opa_vnic_process_vema_config(struct opa_vnic_adapter *adapter)
 135 {
 136         struct __opa_veswport_info *info = &adapter->info;
 137         struct rdma_netdev *rn = netdev_priv(adapter->netdev);
 138         u8 port_num[OPA_VESW_MAX_NUM_DEF_PORT] = { 0 };
 139         struct net_device *netdev = adapter->netdev;
 140         u8 i, port_count = 0;
 141         u16 port_mask;
 142
 143         /* If the base_mac_addr is changed, update the interface mac address */
 144         if (memcmp(info->vport.base_mac_addr, adapter->vema_mac_addr,
 145                    ARRAY_SIZE(info->vport.base_mac_addr))) {
 146                 struct sockaddr saddr;
 147
 148                 memcpy(saddr.sa_data, info->vport.base_mac_addr,
 149                        ARRAY_SIZE(info->vport.base_mac_addr));
 150                 mutex_lock(&adapter->lock);
 151                 eth_commit_mac_addr_change(netdev, &saddr);
 152                 memcpy(adapter->vema_mac_addr,
 153                        info->vport.base_mac_addr, ETH_ALEN);
 154                 mutex_unlock(&adapter->lock);
 155         }
 156
 157         rn->set_id(netdev, info->vesw.vesw_id);
 158
 159         /* Handle MTU limit change */
 160         rtnl_lock();
 161         netdev->max_mtu = max_t(unsigned int, info->vesw.eth_mtu,
 162                                 netdev->min_mtu);
 163         if (netdev->mtu > netdev->max_mtu)
 164                 dev_set_mtu(netdev, netdev->max_mtu);
 165         rtnl_unlock();
 166
 167         /* Update flow to default port redirection table */
 168         port_mask = info->vesw.def_port_mask;
 169         for (i = 0; i < OPA_VESW_MAX_NUM_DEF_PORT; i++) {
 170                 if (port_mask & 1)
 171                         port_num[port_count++] = i;
 172                 port_mask >>= 1;
 173         }
 174
 175         /*
 176          * Build the flow table. Flow table is required when destination LID
 177          * is not available. Up to OPA_VNIC_FLOW_TBL_SIZE flows supported.
 178          * Each flow need a default port number to get its dlid from the
 179          * u_ucast_dlid array.
 180          */
 181         for (i = 0; i < OPA_VNIC_FLOW_TBL_SIZE; i++)
 182                 adapter->flow_tbl[i] = port_count ? port_num[i % port_count] :
 183                                                     OPA_VNIC_INVALID_PORT;
 184
 185         /* update state */
 186         opa_vnic_update_state(adapter, !!(netdev->flags & IFF_UP));
 187 }
 188
 189 /*
 190  * Set the power on default values in adapter's vema interface structure.
 191  */
 192 static inline void opa_vnic_set_pod_values(struct opa_vnic_adapter *adapter)
 193 {
 194         adapter->info.vport.max_mac_tbl_ent = OPA_VNIC_MAC_TBL_MAX_ENTRIES;
 195         adapter->info.vport.max_smac_ent = OPA_VNIC_MAX_SMAC_LIMIT;
 196         adapter->info.vport.config_state = OPA_VNIC_STATE_DROP_ALL;
 197         adapter->info.vport.eth_link_status = OPA_VNIC_ETH_LINK_DOWN;
 198         adapter->info.vesw.eth_mtu = ETH_DATA_LEN;
 199 }
 200
 201 /* opa_vnic_set_mac_addr - change mac address */
 202 static int opa_vnic_set_mac_addr(struct net_device *netdev, void *addr)
 203 {
 204         struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
 205         struct sockaddr *sa = addr;
 206         int rc;
 207
 208         if (!memcmp(netdev->dev_addr, sa->sa_data, ETH_ALEN))
 209                 return 0;
 210
 211         mutex_lock(&adapter->lock);
 212         rc = eth_mac_addr(netdev, addr);
 213         mutex_unlock(&adapter->lock);
 214         if (rc)
 215                 return rc;
 216
 217         adapter->info.vport.uc_macs_gen_count++;
 218         opa_vnic_vema_report_event(adapter,
 219                                    OPA_VESWPORT_TRAP_IFACE_UCAST_MAC_CHANGE);
 220         return 0;
 221 }
 222
 223 /*
 224  * opa_vnic_mac_send_event - post event on possible mac list exchange
 225  *  Send trap when digest from uc/mc mac list differs from previous run.
 226  *  Digest is evaluated similar to how cksum does.
 227  */
 228 static void opa_vnic_mac_send_event(struct net_device *netdev, u8 event)
 229 {
 230         struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
 231         struct netdev_hw_addr *ha;
 232         struct netdev_hw_addr_list *hw_list;
 233         u32 *ref_crc;
 234         u32 l, crc = 0;
 235
 236         switch (event) {
 237         case OPA_VESWPORT_TRAP_IFACE_UCAST_MAC_CHANGE:
 238                 hw_list = &netdev->uc;
 239                 adapter->info.vport.uc_macs_gen_count++;
 240                 ref_crc = &adapter->umac_hash;
 241                 break;
 242         case OPA_VESWPORT_TRAP_IFACE_MCAST_MAC_CHANGE:
 243                 hw_list = &netdev->mc;
 244                 adapter->info.vport.mc_macs_gen_count++;
 245                 ref_crc = &adapter->mmac_hash;
 246                 break;
 247         default:
 248                 return;
 249         }
 250         netdev_hw_addr_list_for_each(ha, hw_list) {
 251                 crc = crc32_le(crc, ha->addr, ETH_ALEN);
 252         }
 253         l = netdev_hw_addr_list_count(hw_list) * ETH_ALEN;
 254         crc = ~crc32_le(crc, (void *)&l, sizeof(l));
 255
 256         if (crc != *ref_crc) {
 257                 *ref_crc = crc;
 258                 opa_vnic_vema_report_event(adapter, event);
 259         }
 260 }
 261
 262 /* opa_vnic_set_rx_mode - handle uc/mc mac list change */
 263 static void opa_vnic_set_rx_mode(struct net_device *netdev)
 264 {
 265         opa_vnic_mac_send_event(netdev,
 266                                 OPA_VESWPORT_TRAP_IFACE_UCAST_MAC_CHANGE);
 267
 268         opa_vnic_mac_send_event(netdev,
 269                                 OPA_VESWPORT_TRAP_IFACE_MCAST_MAC_CHANGE);
 270 }
 271
 272 /* opa_netdev_open - activate network interface */
 273 static int opa_netdev_open(struct net_device *netdev)
 274 {
 275         struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
 276         int rc;
 277
 278         rc = adapter->rn_ops->ndo_open(adapter->netdev);
 279         if (rc) {
 280                 v_dbg("open failed %d\n", rc);
 281                 return rc;
 282         }
 283
 284         /* Update status and send trap */
 285         opa_vnic_update_state(adapter, true);
 286         opa_vnic_vema_report_event(adapter,
 287                                    OPA_VESWPORT_TRAP_ETH_LINK_STATUS_CHANGE);
 288         return 0;
 289 }
 290
 291 /* opa_netdev_close - disable network interface */
 292 static int opa_netdev_close(struct net_device *netdev)
 293 {
 294         struct opa_vnic_adapter *adapter = opa_vnic_priv(netdev);
 295         int rc;
 296
 297         rc = adapter->rn_ops->ndo_stop(adapter->netdev);
 298         if (rc) {
 299                 v_dbg("close failed %d\n", rc);
 300                 return rc;
 301         }
 302
 303         /* Update status and send trap */
 304         opa_vnic_update_state(adapter, false);
 305         opa_vnic_vema_report_event(adapter,
 306                                    OPA_VESWPORT_TRAP_ETH_LINK_STATUS_CHANGE);
 307         return 0;
 308 }
 309
 310 /* netdev ops */
 311 static const struct net_device_ops opa_netdev_ops = {
 312         .ndo_open = opa_netdev_open,
 313         .ndo_stop = opa_netdev_close,
 314         .ndo_start_xmit = opa_netdev_start_xmit,
 315         .ndo_get_stats64 = opa_vnic_get_stats64,
 316         .ndo_set_rx_mode = opa_vnic_set_rx_mode,
 317         .ndo_select_queue = opa_vnic_select_queue,
 318         .ndo_set_mac_address = opa_vnic_set_mac_addr,
 319 };
 320
 321 /* opa_vnic_add_netdev - create vnic netdev interface */
 322 struct opa_vnic_adapter *opa_vnic_add_netdev(struct ib_device *ibdev,
 323                                              u8 port_num, u8 vport_num)
 324 {
 325         struct opa_vnic_adapter *adapter;
 326         struct net_device *netdev;
 327         struct rdma_netdev *rn;
 328         int rc;
 329
 330         netdev = ibdev->ops.alloc_rdma_netdev(ibdev, port_num,
 331                                               RDMA_NETDEV_OPA_VNIC,
 332                                               "veth%d", NET_NAME_UNKNOWN,
 333                                               ether_setup);
 334         if (!netdev)
 335                 return ERR_PTR(-ENOMEM);
 336         else if (IS_ERR(netdev))
 337                 return ERR_CAST(netdev);
 338
 339         rn = netdev_priv(netdev);
 340         adapter = kzalloc(sizeof(*adapter), GFP_KERNEL);
 341         if (!adapter) {
 342                 rc = -ENOMEM;
 343                 goto adapter_err;
 344         }
 345
 346         rn->clnt_priv = adapter;
 347         rn->hca = ibdev;
 348         rn->port_num = port_num;
 349         adapter->netdev = netdev;
 350         adapter->ibdev = ibdev;
 351         adapter->port_num = port_num;
 352         adapter->vport_num = vport_num;
 353         adapter->rn_ops = netdev->netdev_ops;
 354
 355         netdev->netdev_ops = &opa_netdev_ops;
 356         netdev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
 357         netdev->hard_header_len += OPA_VNIC_SKB_HEADROOM;
 358         mutex_init(&adapter->lock);
 359         mutex_init(&adapter->mactbl_lock);
 360         spin_lock_init(&adapter->stats_lock);
 361
 362         SET_NETDEV_DEV(netdev, ibdev->dev.parent);
 363
 364         opa_vnic_set_ethtool_ops(netdev);
 365
 366         opa_vnic_set_pod_values(adapter);
 367
 368         rc = register_netdev(netdev);
 369         if (rc)
 370                 goto netdev_err;
 371
 372         netif_carrier_off(netdev);
 373         netif_dormant_on(netdev);
 374         v_info("initialized\n");
 375
 376         return adapter;
 377 netdev_err:
 378         mutex_destroy(&adapter->lock);
 379         mutex_destroy(&adapter->mactbl_lock);
 380         kfree(adapter);
 381 adapter_err:
 382         rn->free_rdma_netdev(netdev);
 383
 384         return ERR_PTR(rc);
 385 }
 386
 387 /* opa_vnic_rem_netdev - remove vnic netdev interface */
 388 void opa_vnic_rem_netdev(struct opa_vnic_adapter *adapter)
 389 {
 390         struct net_device *netdev = adapter->netdev;
 391         struct rdma_netdev *rn = netdev_priv(netdev);
 392
 393         v_info("removing\n");
 394         unregister_netdev(netdev);
 395         opa_vnic_release_mac_tbl(adapter);
 396         mutex_destroy(&adapter->lock);
 397         mutex_destroy(&adapter->mactbl_lock);
 398         kfree(adapter);
 399         rn->free_rdma_netdev(netdev);
 400 }