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 */ 64static 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 */ 78static 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 96static 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 112static 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 */ 134void 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 */ 192static 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 */ 202static 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 */ 228static 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 */ 263static 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 */ 273static 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 */ 292static 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 */ 311static 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 */ 322struct 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; 377netdev_err: 378 mutex_destroy(&adapter->lock); 379 mutex_destroy(&adapter->mactbl_lock); 380 kfree(adapter); 381adapter_err: 382 rn->free_rdma_netdev(netdev); 383 384 return ERR_PTR(rc); 385} 386 387/* opa_vnic_rem_netdev - remove vnic netdev interface */ 388void 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} 401