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 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 */ 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 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 } 112 113 static 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 */ 135 void 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 */ 193 static 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 */ 203 static 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 */ 229 static 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 */ 264 static 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 */ 274 static 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 */ 293 static 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 */ 312 static 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 */ 323 struct 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; 378 netdev_err: 379 mutex_destroy(&adapter->lock); 380 mutex_destroy(&adapter->mactbl_lock); 381 kfree(adapter); 382 adapter_err: 383 rn->free_rdma_netdev(netdev); 384 385 return ERR_PTR(rc); 386 } 387 388 /* opa_vnic_rem_netdev - remove vnic netdev interface */ 389 void 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