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