884 lines · c
1/*2 * Copyright (c) 2005 Voltaire Inc. All rights reserved.3 * Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.4 * Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.5 * Copyright (c) 2005 Intel Corporation. All rights reserved.6 *7 * This software is available to you under a choice of one of two8 * licenses. You may choose to be licensed under the terms of the GNU9 * General Public License (GPL) Version 2, available from the file10 * COPYING in the main directory of this source tree, or the11 * OpenIB.org BSD license below:12 *13 * Redistribution and use in source and binary forms, with or14 * without modification, are permitted provided that the following15 * conditions are met:16 *17 * - Redistributions of source code must retain the above18 * copyright notice, this list of conditions and the following19 * disclaimer.20 *21 * - Redistributions in binary form must reproduce the above22 * copyright notice, this list of conditions and the following23 * disclaimer in the documentation and/or other materials24 * provided with the distribution.25 *26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE33 * SOFTWARE.34 */35 36#include <linux/mutex.h>37#include <linux/inetdevice.h>38#include <linux/slab.h>39#include <linux/workqueue.h>40#include <net/arp.h>41#include <net/neighbour.h>42#include <net/route.h>43#include <net/netevent.h>44#include <net/ipv6_stubs.h>45#include <net/ip6_route.h>46#include <rdma/ib_addr.h>47#include <rdma/ib_cache.h>48#include <rdma/ib_sa.h>49#include <rdma/ib.h>50#include <rdma/rdma_netlink.h>51#include <net/netlink.h>52 53#include "core_priv.h"54 55struct addr_req {56 struct list_head list;57 struct sockaddr_storage src_addr;58 struct sockaddr_storage dst_addr;59 struct rdma_dev_addr *addr;60 void *context;61 void (*callback)(int status, struct sockaddr *src_addr,62 struct rdma_dev_addr *addr, void *context);63 unsigned long timeout;64 struct delayed_work work;65 bool resolve_by_gid_attr; /* Consider gid attr in resolve phase */66 int status;67 u32 seq;68};69 70static atomic_t ib_nl_addr_request_seq = ATOMIC_INIT(0);71 72static DEFINE_SPINLOCK(lock);73static LIST_HEAD(req_list);74static struct workqueue_struct *addr_wq;75 76static const struct nla_policy ib_nl_addr_policy[LS_NLA_TYPE_MAX] = {77 [LS_NLA_TYPE_DGID] = {.type = NLA_BINARY,78 .len = sizeof(struct rdma_nla_ls_gid),79 .validation_type = NLA_VALIDATE_MIN,80 .min = sizeof(struct rdma_nla_ls_gid)},81};82 83static inline bool ib_nl_is_good_ip_resp(const struct nlmsghdr *nlh)84{85 struct nlattr *tb[LS_NLA_TYPE_MAX] = {};86 int ret;87 88 if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)89 return false;90 91 ret = nla_parse_deprecated(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),92 nlmsg_len(nlh), ib_nl_addr_policy, NULL);93 if (ret)94 return false;95 96 return true;97}98 99static void ib_nl_process_good_ip_rsep(const struct nlmsghdr *nlh)100{101 const struct nlattr *head, *curr;102 union ib_gid gid;103 struct addr_req *req;104 int len, rem;105 int found = 0;106 107 head = (const struct nlattr *)nlmsg_data(nlh);108 len = nlmsg_len(nlh);109 110 nla_for_each_attr(curr, head, len, rem) {111 if (curr->nla_type == LS_NLA_TYPE_DGID)112 memcpy(&gid, nla_data(curr), nla_len(curr));113 }114 115 spin_lock_bh(&lock);116 list_for_each_entry(req, &req_list, list) {117 if (nlh->nlmsg_seq != req->seq)118 continue;119 /* We set the DGID part, the rest was set earlier */120 rdma_addr_set_dgid(req->addr, &gid);121 req->status = 0;122 found = 1;123 break;124 }125 spin_unlock_bh(&lock);126 127 if (!found)128 pr_info("Couldn't find request waiting for DGID: %pI6\n",129 &gid);130}131 132int ib_nl_handle_ip_res_resp(struct sk_buff *skb,133 struct nlmsghdr *nlh,134 struct netlink_ext_ack *extack)135{136 if ((nlh->nlmsg_flags & NLM_F_REQUEST) ||137 !(NETLINK_CB(skb).sk))138 return -EPERM;139 140 if (ib_nl_is_good_ip_resp(nlh))141 ib_nl_process_good_ip_rsep(nlh);142 143 return 0;144}145 146static int ib_nl_ip_send_msg(struct rdma_dev_addr *dev_addr,147 const void *daddr,148 u32 seq, u16 family)149{150 struct sk_buff *skb = NULL;151 struct nlmsghdr *nlh;152 struct rdma_ls_ip_resolve_header *header;153 void *data;154 size_t size;155 int attrtype;156 int len;157 158 if (family == AF_INET) {159 size = sizeof(struct in_addr);160 attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV4;161 } else {162 size = sizeof(struct in6_addr);163 attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV6;164 }165 166 len = nla_total_size(sizeof(size));167 len += NLMSG_ALIGN(sizeof(*header));168 169 skb = nlmsg_new(len, GFP_KERNEL);170 if (!skb)171 return -ENOMEM;172 173 data = ibnl_put_msg(skb, &nlh, seq, 0, RDMA_NL_LS,174 RDMA_NL_LS_OP_IP_RESOLVE, NLM_F_REQUEST);175 if (!data) {176 nlmsg_free(skb);177 return -ENODATA;178 }179 180 /* Construct the family header first */181 header = skb_put(skb, NLMSG_ALIGN(sizeof(*header)));182 header->ifindex = dev_addr->bound_dev_if;183 nla_put(skb, attrtype, size, daddr);184 185 /* Repair the nlmsg header length */186 nlmsg_end(skb, nlh);187 rdma_nl_multicast(&init_net, skb, RDMA_NL_GROUP_LS, GFP_KERNEL);188 189 /* Make the request retry, so when we get the response from userspace190 * we will have something.191 */192 return -ENODATA;193}194 195int rdma_addr_size(const struct sockaddr *addr)196{197 switch (addr->sa_family) {198 case AF_INET:199 return sizeof(struct sockaddr_in);200 case AF_INET6:201 return sizeof(struct sockaddr_in6);202 case AF_IB:203 return sizeof(struct sockaddr_ib);204 default:205 return 0;206 }207}208EXPORT_SYMBOL(rdma_addr_size);209 210int rdma_addr_size_in6(struct sockaddr_in6 *addr)211{212 int ret = rdma_addr_size((struct sockaddr *) addr);213 214 return ret <= sizeof(*addr) ? ret : 0;215}216EXPORT_SYMBOL(rdma_addr_size_in6);217 218int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr)219{220 int ret = rdma_addr_size((struct sockaddr *) addr);221 222 return ret <= sizeof(*addr) ? ret : 0;223}224EXPORT_SYMBOL(rdma_addr_size_kss);225 226/**227 * rdma_copy_src_l2_addr - Copy netdevice source addresses228 * @dev_addr: Destination address pointer where to copy the addresses229 * @dev: Netdevice whose source addresses to copy230 *231 * rdma_copy_src_l2_addr() copies source addresses from the specified netdevice.232 * This includes unicast address, broadcast address, device type and233 * interface index.234 */235void rdma_copy_src_l2_addr(struct rdma_dev_addr *dev_addr,236 const struct net_device *dev)237{238 dev_addr->dev_type = dev->type;239 memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);240 memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);241 dev_addr->bound_dev_if = dev->ifindex;242}243EXPORT_SYMBOL(rdma_copy_src_l2_addr);244 245static struct net_device *246rdma_find_ndev_for_src_ip_rcu(struct net *net, const struct sockaddr *src_in)247{248 struct net_device *dev = NULL;249 int ret = -EADDRNOTAVAIL;250 251 switch (src_in->sa_family) {252 case AF_INET:253 dev = __ip_dev_find(net,254 ((const struct sockaddr_in *)src_in)->sin_addr.s_addr,255 false);256 if (dev)257 ret = 0;258 break;259#if IS_ENABLED(CONFIG_IPV6)260 case AF_INET6:261 for_each_netdev_rcu(net, dev) {262 if (ipv6_chk_addr(net,263 &((const struct sockaddr_in6 *)src_in)->sin6_addr,264 dev, 1)) {265 ret = 0;266 break;267 }268 }269 break;270#endif271 }272 return ret ? ERR_PTR(ret) : dev;273}274 275int rdma_translate_ip(const struct sockaddr *addr,276 struct rdma_dev_addr *dev_addr)277{278 struct net_device *dev;279 280 if (dev_addr->bound_dev_if) {281 dev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);282 if (!dev)283 return -ENODEV;284 rdma_copy_src_l2_addr(dev_addr, dev);285 dev_put(dev);286 return 0;287 }288 289 rcu_read_lock();290 dev = rdma_find_ndev_for_src_ip_rcu(dev_addr->net, addr);291 if (!IS_ERR(dev))292 rdma_copy_src_l2_addr(dev_addr, dev);293 rcu_read_unlock();294 return PTR_ERR_OR_ZERO(dev);295}296EXPORT_SYMBOL(rdma_translate_ip);297 298static void set_timeout(struct addr_req *req, unsigned long time)299{300 unsigned long delay;301 302 delay = time - jiffies;303 if ((long)delay < 0)304 delay = 0;305 306 mod_delayed_work(addr_wq, &req->work, delay);307}308 309static void queue_req(struct addr_req *req)310{311 spin_lock_bh(&lock);312 list_add_tail(&req->list, &req_list);313 set_timeout(req, req->timeout);314 spin_unlock_bh(&lock);315}316 317static int ib_nl_fetch_ha(struct rdma_dev_addr *dev_addr,318 const void *daddr, u32 seq, u16 family)319{320 if (!rdma_nl_chk_listeners(RDMA_NL_GROUP_LS))321 return -EADDRNOTAVAIL;322 323 return ib_nl_ip_send_msg(dev_addr, daddr, seq, family);324}325 326static int dst_fetch_ha(const struct dst_entry *dst,327 struct rdma_dev_addr *dev_addr,328 const void *daddr)329{330 struct neighbour *n;331 int ret = 0;332 333 n = dst_neigh_lookup(dst, daddr);334 if (!n)335 return -ENODATA;336 337 if (!(n->nud_state & NUD_VALID)) {338 neigh_event_send(n, NULL);339 ret = -ENODATA;340 } else {341 neigh_ha_snapshot(dev_addr->dst_dev_addr, n, dst->dev);342 }343 344 neigh_release(n);345 346 return ret;347}348 349static bool has_gateway(const struct dst_entry *dst, sa_family_t family)350{351 if (family == AF_INET)352 return dst_rtable(dst)->rt_uses_gateway;353 354 return dst_rt6_info(dst)->rt6i_flags & RTF_GATEWAY;355}356 357static int fetch_ha(const struct dst_entry *dst, struct rdma_dev_addr *dev_addr,358 const struct sockaddr *dst_in, u32 seq)359{360 const struct sockaddr_in *dst_in4 =361 (const struct sockaddr_in *)dst_in;362 const struct sockaddr_in6 *dst_in6 =363 (const struct sockaddr_in6 *)dst_in;364 const void *daddr = (dst_in->sa_family == AF_INET) ?365 (const void *)&dst_in4->sin_addr.s_addr :366 (const void *)&dst_in6->sin6_addr;367 sa_family_t family = dst_in->sa_family;368 369 might_sleep();370 371 /* If we have a gateway in IB mode then it must be an IB network */372 if (has_gateway(dst, family) && dev_addr->network == RDMA_NETWORK_IB)373 return ib_nl_fetch_ha(dev_addr, daddr, seq, family);374 else375 return dst_fetch_ha(dst, dev_addr, daddr);376}377 378static int addr4_resolve(struct sockaddr *src_sock,379 const struct sockaddr *dst_sock,380 struct rdma_dev_addr *addr,381 struct rtable **prt)382{383 struct sockaddr_in *src_in = (struct sockaddr_in *)src_sock;384 const struct sockaddr_in *dst_in =385 (const struct sockaddr_in *)dst_sock;386 387 __be32 src_ip = src_in->sin_addr.s_addr;388 __be32 dst_ip = dst_in->sin_addr.s_addr;389 struct rtable *rt;390 struct flowi4 fl4;391 int ret;392 393 memset(&fl4, 0, sizeof(fl4));394 fl4.daddr = dst_ip;395 fl4.saddr = src_ip;396 fl4.flowi4_oif = addr->bound_dev_if;397 rt = ip_route_output_key(addr->net, &fl4);398 ret = PTR_ERR_OR_ZERO(rt);399 if (ret)400 return ret;401 402 src_in->sin_addr.s_addr = fl4.saddr;403 404 addr->hoplimit = ip4_dst_hoplimit(&rt->dst);405 406 *prt = rt;407 return 0;408}409 410#if IS_ENABLED(CONFIG_IPV6)411static int addr6_resolve(struct sockaddr *src_sock,412 const struct sockaddr *dst_sock,413 struct rdma_dev_addr *addr,414 struct dst_entry **pdst)415{416 struct sockaddr_in6 *src_in = (struct sockaddr_in6 *)src_sock;417 const struct sockaddr_in6 *dst_in =418 (const struct sockaddr_in6 *)dst_sock;419 struct flowi6 fl6;420 struct dst_entry *dst;421 422 memset(&fl6, 0, sizeof fl6);423 fl6.daddr = dst_in->sin6_addr;424 fl6.saddr = src_in->sin6_addr;425 fl6.flowi6_oif = addr->bound_dev_if;426 427 dst = ipv6_stub->ipv6_dst_lookup_flow(addr->net, NULL, &fl6, NULL);428 if (IS_ERR(dst))429 return PTR_ERR(dst);430 431 if (ipv6_addr_any(&src_in->sin6_addr))432 src_in->sin6_addr = fl6.saddr;433 434 addr->hoplimit = ip6_dst_hoplimit(dst);435 436 *pdst = dst;437 return 0;438}439#else440static int addr6_resolve(struct sockaddr *src_sock,441 const struct sockaddr *dst_sock,442 struct rdma_dev_addr *addr,443 struct dst_entry **pdst)444{445 return -EADDRNOTAVAIL;446}447#endif448 449static int addr_resolve_neigh(const struct dst_entry *dst,450 const struct sockaddr *dst_in,451 struct rdma_dev_addr *addr,452 unsigned int ndev_flags,453 u32 seq)454{455 int ret = 0;456 457 if (ndev_flags & IFF_LOOPBACK) {458 memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);459 } else {460 if (!(ndev_flags & IFF_NOARP)) {461 /* If the device doesn't do ARP internally */462 ret = fetch_ha(dst, addr, dst_in, seq);463 }464 }465 return ret;466}467 468static int copy_src_l2_addr(struct rdma_dev_addr *dev_addr,469 const struct sockaddr *dst_in,470 const struct dst_entry *dst,471 const struct net_device *ndev)472{473 int ret = 0;474 475 if (dst->dev->flags & IFF_LOOPBACK)476 ret = rdma_translate_ip(dst_in, dev_addr);477 else478 rdma_copy_src_l2_addr(dev_addr, dst->dev);479 480 /*481 * If there's a gateway and type of device not ARPHRD_INFINIBAND,482 * we're definitely in RoCE v2 (as RoCE v1 isn't routable) set the483 * network type accordingly.484 */485 if (has_gateway(dst, dst_in->sa_family) &&486 ndev->type != ARPHRD_INFINIBAND)487 dev_addr->network = dst_in->sa_family == AF_INET ?488 RDMA_NETWORK_IPV4 :489 RDMA_NETWORK_IPV6;490 else491 dev_addr->network = RDMA_NETWORK_IB;492 493 return ret;494}495 496static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,497 unsigned int *ndev_flags,498 const struct sockaddr *dst_in,499 const struct dst_entry *dst)500{501 struct net_device *ndev = READ_ONCE(dst->dev);502 503 *ndev_flags = ndev->flags;504 /* A physical device must be the RDMA device to use */505 if (ndev->flags & IFF_LOOPBACK) {506 /*507 * RDMA (IB/RoCE, iWarp) doesn't run on lo interface or508 * loopback IP address. So if route is resolved to loopback509 * interface, translate that to a real ndev based on non510 * loopback IP address.511 */512 ndev = rdma_find_ndev_for_src_ip_rcu(dev_net(ndev), dst_in);513 if (IS_ERR(ndev))514 return -ENODEV;515 }516 517 return copy_src_l2_addr(dev_addr, dst_in, dst, ndev);518}519 520static int set_addr_netns_by_gid_rcu(struct rdma_dev_addr *addr)521{522 struct net_device *ndev;523 524 ndev = rdma_read_gid_attr_ndev_rcu(addr->sgid_attr);525 if (IS_ERR(ndev))526 return PTR_ERR(ndev);527 528 /*529 * Since we are holding the rcu, reading net and ifindex530 * are safe without any additional reference; because531 * change_net_namespace() in net/core/dev.c does rcu sync532 * after it changes the state to IFF_DOWN and before533 * updating netdev fields {net, ifindex}.534 */535 addr->net = dev_net(ndev);536 addr->bound_dev_if = ndev->ifindex;537 return 0;538}539 540static void rdma_addr_set_net_defaults(struct rdma_dev_addr *addr)541{542 addr->net = &init_net;543 addr->bound_dev_if = 0;544}545 546static int addr_resolve(struct sockaddr *src_in,547 const struct sockaddr *dst_in,548 struct rdma_dev_addr *addr,549 bool resolve_neigh,550 bool resolve_by_gid_attr,551 u32 seq)552{553 struct dst_entry *dst = NULL;554 unsigned int ndev_flags = 0;555 struct rtable *rt = NULL;556 int ret;557 558 if (!addr->net) {559 pr_warn_ratelimited("%s: missing namespace\n", __func__);560 return -EINVAL;561 }562 563 rcu_read_lock();564 if (resolve_by_gid_attr) {565 if (!addr->sgid_attr) {566 rcu_read_unlock();567 pr_warn_ratelimited("%s: missing gid_attr\n", __func__);568 return -EINVAL;569 }570 /*571 * If the request is for a specific gid attribute of the572 * rdma_dev_addr, derive net from the netdevice of the573 * GID attribute.574 */575 ret = set_addr_netns_by_gid_rcu(addr);576 if (ret) {577 rcu_read_unlock();578 return ret;579 }580 }581 if (src_in->sa_family == AF_INET) {582 ret = addr4_resolve(src_in, dst_in, addr, &rt);583 dst = &rt->dst;584 } else {585 ret = addr6_resolve(src_in, dst_in, addr, &dst);586 }587 if (ret) {588 rcu_read_unlock();589 goto done;590 }591 ret = rdma_set_src_addr_rcu(addr, &ndev_flags, dst_in, dst);592 rcu_read_unlock();593 594 /*595 * Resolve neighbor destination address if requested and596 * only if src addr translation didn't fail.597 */598 if (!ret && resolve_neigh)599 ret = addr_resolve_neigh(dst, dst_in, addr, ndev_flags, seq);600 601 if (src_in->sa_family == AF_INET)602 ip_rt_put(rt);603 else604 dst_release(dst);605done:606 /*607 * Clear the addr net to go back to its original state, only if it was608 * derived from GID attribute in this context.609 */610 if (resolve_by_gid_attr)611 rdma_addr_set_net_defaults(addr);612 return ret;613}614 615static void process_one_req(struct work_struct *_work)616{617 struct addr_req *req;618 struct sockaddr *src_in, *dst_in;619 620 req = container_of(_work, struct addr_req, work.work);621 622 if (req->status == -ENODATA) {623 src_in = (struct sockaddr *)&req->src_addr;624 dst_in = (struct sockaddr *)&req->dst_addr;625 req->status = addr_resolve(src_in, dst_in, req->addr,626 true, req->resolve_by_gid_attr,627 req->seq);628 if (req->status && time_after_eq(jiffies, req->timeout)) {629 req->status = -ETIMEDOUT;630 } else if (req->status == -ENODATA) {631 /* requeue the work for retrying again */632 spin_lock_bh(&lock);633 if (!list_empty(&req->list))634 set_timeout(req, req->timeout);635 spin_unlock_bh(&lock);636 return;637 }638 }639 640 req->callback(req->status, (struct sockaddr *)&req->src_addr,641 req->addr, req->context);642 req->callback = NULL;643 644 spin_lock_bh(&lock);645 /*646 * Although the work will normally have been canceled by the workqueue,647 * it can still be requeued as long as it is on the req_list.648 */649 cancel_delayed_work(&req->work);650 if (!list_empty(&req->list)) {651 list_del_init(&req->list);652 kfree(req);653 }654 spin_unlock_bh(&lock);655}656 657int rdma_resolve_ip(struct sockaddr *src_addr, const struct sockaddr *dst_addr,658 struct rdma_dev_addr *addr, unsigned long timeout_ms,659 void (*callback)(int status, struct sockaddr *src_addr,660 struct rdma_dev_addr *addr, void *context),661 bool resolve_by_gid_attr, void *context)662{663 struct sockaddr *src_in, *dst_in;664 struct addr_req *req;665 int ret = 0;666 667 req = kzalloc(sizeof *req, GFP_KERNEL);668 if (!req)669 return -ENOMEM;670 671 src_in = (struct sockaddr *) &req->src_addr;672 dst_in = (struct sockaddr *) &req->dst_addr;673 674 if (src_addr) {675 if (src_addr->sa_family != dst_addr->sa_family) {676 ret = -EINVAL;677 goto err;678 }679 680 memcpy(src_in, src_addr, rdma_addr_size(src_addr));681 } else {682 src_in->sa_family = dst_addr->sa_family;683 }684 685 memcpy(dst_in, dst_addr, rdma_addr_size(dst_addr));686 req->addr = addr;687 req->callback = callback;688 req->context = context;689 req->resolve_by_gid_attr = resolve_by_gid_attr;690 INIT_DELAYED_WORK(&req->work, process_one_req);691 req->seq = (u32)atomic_inc_return(&ib_nl_addr_request_seq);692 693 req->status = addr_resolve(src_in, dst_in, addr, true,694 req->resolve_by_gid_attr, req->seq);695 switch (req->status) {696 case 0:697 req->timeout = jiffies;698 queue_req(req);699 break;700 case -ENODATA:701 req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;702 queue_req(req);703 break;704 default:705 ret = req->status;706 goto err;707 }708 return ret;709err:710 kfree(req);711 return ret;712}713EXPORT_SYMBOL(rdma_resolve_ip);714 715int roce_resolve_route_from_path(struct sa_path_rec *rec,716 const struct ib_gid_attr *attr)717{718 union {719 struct sockaddr _sockaddr;720 struct sockaddr_in _sockaddr_in;721 struct sockaddr_in6 _sockaddr_in6;722 } sgid, dgid;723 struct rdma_dev_addr dev_addr = {};724 int ret;725 726 might_sleep();727 728 if (rec->roce.route_resolved)729 return 0;730 731 rdma_gid2ip((struct sockaddr *)&sgid, &rec->sgid);732 rdma_gid2ip((struct sockaddr *)&dgid, &rec->dgid);733 734 if (sgid._sockaddr.sa_family != dgid._sockaddr.sa_family)735 return -EINVAL;736 737 if (!attr || !attr->ndev)738 return -EINVAL;739 740 dev_addr.net = &init_net;741 dev_addr.sgid_attr = attr;742 743 ret = addr_resolve((struct sockaddr *)&sgid, (struct sockaddr *)&dgid,744 &dev_addr, false, true, 0);745 if (ret)746 return ret;747 748 if ((dev_addr.network == RDMA_NETWORK_IPV4 ||749 dev_addr.network == RDMA_NETWORK_IPV6) &&750 rec->rec_type != SA_PATH_REC_TYPE_ROCE_V2)751 return -EINVAL;752 753 rec->roce.route_resolved = true;754 return 0;755}756 757/**758 * rdma_addr_cancel - Cancel resolve ip request759 * @addr: Pointer to address structure given previously760 * during rdma_resolve_ip().761 * rdma_addr_cancel() is synchronous function which cancels any pending762 * request if there is any.763 */764void rdma_addr_cancel(struct rdma_dev_addr *addr)765{766 struct addr_req *req, *temp_req;767 struct addr_req *found = NULL;768 769 spin_lock_bh(&lock);770 list_for_each_entry_safe(req, temp_req, &req_list, list) {771 if (req->addr == addr) {772 /*773 * Removing from the list means we take ownership of774 * the req775 */776 list_del_init(&req->list);777 found = req;778 break;779 }780 }781 spin_unlock_bh(&lock);782 783 if (!found)784 return;785 786 /*787 * sync canceling the work after removing it from the req_list788 * guarentees no work is running and none will be started.789 */790 cancel_delayed_work_sync(&found->work);791 kfree(found);792}793EXPORT_SYMBOL(rdma_addr_cancel);794 795struct resolve_cb_context {796 struct completion comp;797 int status;798};799 800static void resolve_cb(int status, struct sockaddr *src_addr,801 struct rdma_dev_addr *addr, void *context)802{803 ((struct resolve_cb_context *)context)->status = status;804 complete(&((struct resolve_cb_context *)context)->comp);805}806 807int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,808 const union ib_gid *dgid,809 u8 *dmac, const struct ib_gid_attr *sgid_attr,810 int *hoplimit)811{812 struct rdma_dev_addr dev_addr;813 struct resolve_cb_context ctx;814 union {815 struct sockaddr_in _sockaddr_in;816 struct sockaddr_in6 _sockaddr_in6;817 } sgid_addr, dgid_addr;818 int ret;819 820 rdma_gid2ip((struct sockaddr *)&sgid_addr, sgid);821 rdma_gid2ip((struct sockaddr *)&dgid_addr, dgid);822 823 memset(&dev_addr, 0, sizeof(dev_addr));824 dev_addr.net = &init_net;825 dev_addr.sgid_attr = sgid_attr;826 827 init_completion(&ctx.comp);828 ret = rdma_resolve_ip((struct sockaddr *)&sgid_addr,829 (struct sockaddr *)&dgid_addr, &dev_addr, 1000,830 resolve_cb, true, &ctx);831 if (ret)832 return ret;833 834 wait_for_completion(&ctx.comp);835 836 ret = ctx.status;837 if (ret)838 return ret;839 840 memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN);841 *hoplimit = dev_addr.hoplimit;842 return 0;843}844 845static int netevent_callback(struct notifier_block *self, unsigned long event,846 void *ctx)847{848 struct addr_req *req;849 850 if (event == NETEVENT_NEIGH_UPDATE) {851 struct neighbour *neigh = ctx;852 853 if (neigh->nud_state & NUD_VALID) {854 spin_lock_bh(&lock);855 list_for_each_entry(req, &req_list, list)856 set_timeout(req, jiffies);857 spin_unlock_bh(&lock);858 }859 }860 return 0;861}862 863static struct notifier_block nb = {864 .notifier_call = netevent_callback865};866 867int addr_init(void)868{869 addr_wq = alloc_ordered_workqueue("ib_addr", 0);870 if (!addr_wq)871 return -ENOMEM;872 873 register_netevent_notifier(&nb);874 875 return 0;876}877 878void addr_cleanup(void)879{880 unregister_netevent_notifier(&nb);881 destroy_workqueue(addr_wq);882 WARN_ON(!list_empty(&req_list));883}884