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1/*2 * Copyright(c) 2017 Intel Corporation.3 *4 * This file is provided under a dual BSD/GPLv2 license. When using or5 * redistributing this file, you may do so under either license.6 *7 * GPL LICENSE SUMMARY8 *9 * This program is free software; you can redistribute it and/or modify10 * it under the terms of version 2 of the GNU General Public License as11 * published by the Free Software Foundation.12 *13 * This program is distributed in the hope that it will be useful, but14 * WITHOUT ANY WARRANTY; without even the implied warranty of15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU16 * General Public License for more details.17 *18 * BSD LICENSE19 *20 * Redistribution and use in source and binary forms, with or without21 * modification, are permitted provided that the following conditions22 * are met:23 *24 * - Redistributions of source code must retain the above copyright25 * notice, this list of conditions and the following disclaimer.26 * - Redistributions in binary form must reproduce the above copyright27 * notice, this list of conditions and the following disclaimer in28 * the documentation and/or other materials provided with the29 * distribution.30 * - Neither the name of Intel Corporation nor the names of its31 * contributors may be used to endorse or promote products derived32 * from this software without specific prior written permission.33 *34 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS35 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT36 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR37 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT38 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,39 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT40 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,41 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY42 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT43 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE44 * 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) driver50 * 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 100059 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 else129 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 LID177 * 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 the179 * 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 exchange225 * 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