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f8f2a576cb
Under one path through ib_nl_fetch_ha() this calls nlmsg_new(GFP_KERNEL) which is a sleeping call. This is a very rare path, so mark fetch_ha() and the module external entry point that conditionally calls through to fetch_ha() as might_sleep(). Link: https://lore.kernel.org/r/20200506074701.9775-2-leon@kernel.org Signed-off-by: Leon Romanovsky <leonro@mellanox.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
890 lines
22 KiB
C
890 lines
22 KiB
C
/*
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* Copyright (c) 2005 Voltaire Inc. All rights reserved.
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* Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
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* Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
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* Copyright (c) 2005 Intel Corporation. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/mutex.h>
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#include <linux/inetdevice.h>
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#include <linux/slab.h>
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#include <linux/workqueue.h>
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#include <linux/module.h>
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#include <net/arp.h>
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#include <net/neighbour.h>
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#include <net/route.h>
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#include <net/netevent.h>
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#include <net/ipv6_stubs.h>
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#include <net/ip6_route.h>
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#include <rdma/ib_addr.h>
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#include <rdma/ib_cache.h>
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#include <rdma/ib_sa.h>
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#include <rdma/ib.h>
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#include <rdma/rdma_netlink.h>
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#include <net/netlink.h>
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#include "core_priv.h"
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struct addr_req {
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struct list_head list;
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struct sockaddr_storage src_addr;
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struct sockaddr_storage dst_addr;
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struct rdma_dev_addr *addr;
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void *context;
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void (*callback)(int status, struct sockaddr *src_addr,
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struct rdma_dev_addr *addr, void *context);
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unsigned long timeout;
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struct delayed_work work;
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bool resolve_by_gid_attr; /* Consider gid attr in resolve phase */
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int status;
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u32 seq;
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};
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static atomic_t ib_nl_addr_request_seq = ATOMIC_INIT(0);
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static DEFINE_SPINLOCK(lock);
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static LIST_HEAD(req_list);
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static struct workqueue_struct *addr_wq;
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static const struct nla_policy ib_nl_addr_policy[LS_NLA_TYPE_MAX] = {
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[LS_NLA_TYPE_DGID] = {.type = NLA_BINARY,
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.len = sizeof(struct rdma_nla_ls_gid)},
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};
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static inline bool ib_nl_is_good_ip_resp(const struct nlmsghdr *nlh)
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{
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struct nlattr *tb[LS_NLA_TYPE_MAX] = {};
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int ret;
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if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
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return false;
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ret = nla_parse_deprecated(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
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nlmsg_len(nlh), ib_nl_addr_policy, NULL);
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if (ret)
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return false;
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return true;
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}
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static void ib_nl_process_good_ip_rsep(const struct nlmsghdr *nlh)
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{
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const struct nlattr *head, *curr;
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union ib_gid gid;
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struct addr_req *req;
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int len, rem;
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int found = 0;
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head = (const struct nlattr *)nlmsg_data(nlh);
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len = nlmsg_len(nlh);
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nla_for_each_attr(curr, head, len, rem) {
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if (curr->nla_type == LS_NLA_TYPE_DGID)
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memcpy(&gid, nla_data(curr), nla_len(curr));
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}
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spin_lock_bh(&lock);
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list_for_each_entry(req, &req_list, list) {
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if (nlh->nlmsg_seq != req->seq)
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continue;
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/* We set the DGID part, the rest was set earlier */
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rdma_addr_set_dgid(req->addr, &gid);
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req->status = 0;
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found = 1;
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break;
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}
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spin_unlock_bh(&lock);
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if (!found)
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pr_info("Couldn't find request waiting for DGID: %pI6\n",
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&gid);
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}
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int ib_nl_handle_ip_res_resp(struct sk_buff *skb,
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struct nlmsghdr *nlh,
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struct netlink_ext_ack *extack)
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{
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if ((nlh->nlmsg_flags & NLM_F_REQUEST) ||
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!(NETLINK_CB(skb).sk))
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return -EPERM;
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if (ib_nl_is_good_ip_resp(nlh))
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ib_nl_process_good_ip_rsep(nlh);
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return 0;
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}
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static int ib_nl_ip_send_msg(struct rdma_dev_addr *dev_addr,
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const void *daddr,
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u32 seq, u16 family)
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{
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struct sk_buff *skb = NULL;
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struct nlmsghdr *nlh;
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struct rdma_ls_ip_resolve_header *header;
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void *data;
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size_t size;
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int attrtype;
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int len;
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if (family == AF_INET) {
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size = sizeof(struct in_addr);
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attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV4;
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} else {
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size = sizeof(struct in6_addr);
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attrtype = RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_IPV6;
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}
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len = nla_total_size(sizeof(size));
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len += NLMSG_ALIGN(sizeof(*header));
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skb = nlmsg_new(len, GFP_KERNEL);
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if (!skb)
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return -ENOMEM;
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data = ibnl_put_msg(skb, &nlh, seq, 0, RDMA_NL_LS,
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RDMA_NL_LS_OP_IP_RESOLVE, NLM_F_REQUEST);
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if (!data) {
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nlmsg_free(skb);
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return -ENODATA;
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}
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/* Construct the family header first */
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header = skb_put(skb, NLMSG_ALIGN(sizeof(*header)));
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header->ifindex = dev_addr->bound_dev_if;
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nla_put(skb, attrtype, size, daddr);
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/* Repair the nlmsg header length */
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nlmsg_end(skb, nlh);
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rdma_nl_multicast(&init_net, skb, RDMA_NL_GROUP_LS, GFP_KERNEL);
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/* Make the request retry, so when we get the response from userspace
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* we will have something.
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*/
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return -ENODATA;
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}
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int rdma_addr_size(const struct sockaddr *addr)
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{
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switch (addr->sa_family) {
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case AF_INET:
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return sizeof(struct sockaddr_in);
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case AF_INET6:
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return sizeof(struct sockaddr_in6);
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case AF_IB:
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return sizeof(struct sockaddr_ib);
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default:
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return 0;
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}
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}
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EXPORT_SYMBOL(rdma_addr_size);
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int rdma_addr_size_in6(struct sockaddr_in6 *addr)
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{
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int ret = rdma_addr_size((struct sockaddr *) addr);
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return ret <= sizeof(*addr) ? ret : 0;
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}
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EXPORT_SYMBOL(rdma_addr_size_in6);
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int rdma_addr_size_kss(struct __kernel_sockaddr_storage *addr)
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{
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int ret = rdma_addr_size((struct sockaddr *) addr);
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return ret <= sizeof(*addr) ? ret : 0;
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}
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EXPORT_SYMBOL(rdma_addr_size_kss);
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/**
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* rdma_copy_src_l2_addr - Copy netdevice source addresses
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* @dev_addr: Destination address pointer where to copy the addresses
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* @dev: Netdevice whose source addresses to copy
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*
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* rdma_copy_src_l2_addr() copies source addresses from the specified netdevice.
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* This includes unicast address, broadcast address, device type and
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* interface index.
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*/
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void rdma_copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
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const struct net_device *dev)
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{
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dev_addr->dev_type = dev->type;
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memcpy(dev_addr->src_dev_addr, dev->dev_addr, MAX_ADDR_LEN);
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memcpy(dev_addr->broadcast, dev->broadcast, MAX_ADDR_LEN);
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dev_addr->bound_dev_if = dev->ifindex;
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}
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EXPORT_SYMBOL(rdma_copy_src_l2_addr);
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static struct net_device *
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rdma_find_ndev_for_src_ip_rcu(struct net *net, const struct sockaddr *src_in)
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{
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struct net_device *dev = NULL;
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int ret = -EADDRNOTAVAIL;
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switch (src_in->sa_family) {
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case AF_INET:
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dev = __ip_dev_find(net,
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((const struct sockaddr_in *)src_in)->sin_addr.s_addr,
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false);
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if (dev)
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ret = 0;
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break;
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#if IS_ENABLED(CONFIG_IPV6)
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case AF_INET6:
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for_each_netdev_rcu(net, dev) {
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if (ipv6_chk_addr(net,
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&((const struct sockaddr_in6 *)src_in)->sin6_addr,
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dev, 1)) {
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ret = 0;
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break;
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}
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}
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break;
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#endif
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}
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return ret ? ERR_PTR(ret) : dev;
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}
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int rdma_translate_ip(const struct sockaddr *addr,
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struct rdma_dev_addr *dev_addr)
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{
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struct net_device *dev;
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if (dev_addr->bound_dev_if) {
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dev = dev_get_by_index(dev_addr->net, dev_addr->bound_dev_if);
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if (!dev)
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return -ENODEV;
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rdma_copy_src_l2_addr(dev_addr, dev);
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dev_put(dev);
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return 0;
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}
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rcu_read_lock();
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dev = rdma_find_ndev_for_src_ip_rcu(dev_addr->net, addr);
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if (!IS_ERR(dev))
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rdma_copy_src_l2_addr(dev_addr, dev);
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rcu_read_unlock();
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return PTR_ERR_OR_ZERO(dev);
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}
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EXPORT_SYMBOL(rdma_translate_ip);
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static void set_timeout(struct addr_req *req, unsigned long time)
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{
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unsigned long delay;
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delay = time - jiffies;
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if ((long)delay < 0)
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delay = 0;
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mod_delayed_work(addr_wq, &req->work, delay);
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}
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static void queue_req(struct addr_req *req)
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{
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spin_lock_bh(&lock);
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list_add_tail(&req->list, &req_list);
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set_timeout(req, req->timeout);
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spin_unlock_bh(&lock);
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}
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static int ib_nl_fetch_ha(struct rdma_dev_addr *dev_addr,
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const void *daddr, u32 seq, u16 family)
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{
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if (!rdma_nl_chk_listeners(RDMA_NL_GROUP_LS))
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return -EADDRNOTAVAIL;
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return ib_nl_ip_send_msg(dev_addr, daddr, seq, family);
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}
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static int dst_fetch_ha(const struct dst_entry *dst,
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struct rdma_dev_addr *dev_addr,
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const void *daddr)
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{
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struct neighbour *n;
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int ret = 0;
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n = dst_neigh_lookup(dst, daddr);
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if (!n)
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return -ENODATA;
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if (!(n->nud_state & NUD_VALID)) {
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neigh_event_send(n, NULL);
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ret = -ENODATA;
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} else {
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neigh_ha_snapshot(dev_addr->dst_dev_addr, n, dst->dev);
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}
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neigh_release(n);
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return ret;
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}
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static bool has_gateway(const struct dst_entry *dst, sa_family_t family)
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{
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struct rtable *rt;
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struct rt6_info *rt6;
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if (family == AF_INET) {
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rt = container_of(dst, struct rtable, dst);
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return rt->rt_uses_gateway;
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}
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rt6 = container_of(dst, struct rt6_info, dst);
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return rt6->rt6i_flags & RTF_GATEWAY;
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}
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static int fetch_ha(const struct dst_entry *dst, struct rdma_dev_addr *dev_addr,
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const struct sockaddr *dst_in, u32 seq)
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{
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const struct sockaddr_in *dst_in4 =
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(const struct sockaddr_in *)dst_in;
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const struct sockaddr_in6 *dst_in6 =
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(const struct sockaddr_in6 *)dst_in;
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const void *daddr = (dst_in->sa_family == AF_INET) ?
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(const void *)&dst_in4->sin_addr.s_addr :
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(const void *)&dst_in6->sin6_addr;
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sa_family_t family = dst_in->sa_family;
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might_sleep();
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/* If we have a gateway in IB mode then it must be an IB network */
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if (has_gateway(dst, family) && dev_addr->network == RDMA_NETWORK_IB)
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return ib_nl_fetch_ha(dev_addr, daddr, seq, family);
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else
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return dst_fetch_ha(dst, dev_addr, daddr);
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}
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static int addr4_resolve(struct sockaddr *src_sock,
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const struct sockaddr *dst_sock,
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struct rdma_dev_addr *addr,
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struct rtable **prt)
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{
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struct sockaddr_in *src_in = (struct sockaddr_in *)src_sock;
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const struct sockaddr_in *dst_in =
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(const struct sockaddr_in *)dst_sock;
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__be32 src_ip = src_in->sin_addr.s_addr;
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__be32 dst_ip = dst_in->sin_addr.s_addr;
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struct rtable *rt;
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struct flowi4 fl4;
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int ret;
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memset(&fl4, 0, sizeof(fl4));
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fl4.daddr = dst_ip;
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fl4.saddr = src_ip;
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fl4.flowi4_oif = addr->bound_dev_if;
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rt = ip_route_output_key(addr->net, &fl4);
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ret = PTR_ERR_OR_ZERO(rt);
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if (ret)
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return ret;
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src_in->sin_addr.s_addr = fl4.saddr;
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addr->hoplimit = ip4_dst_hoplimit(&rt->dst);
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*prt = rt;
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return 0;
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}
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#if IS_ENABLED(CONFIG_IPV6)
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static int addr6_resolve(struct sockaddr *src_sock,
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const struct sockaddr *dst_sock,
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struct rdma_dev_addr *addr,
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struct dst_entry **pdst)
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{
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struct sockaddr_in6 *src_in = (struct sockaddr_in6 *)src_sock;
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const struct sockaddr_in6 *dst_in =
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(const struct sockaddr_in6 *)dst_sock;
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struct flowi6 fl6;
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struct dst_entry *dst;
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memset(&fl6, 0, sizeof fl6);
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fl6.daddr = dst_in->sin6_addr;
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fl6.saddr = src_in->sin6_addr;
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fl6.flowi6_oif = addr->bound_dev_if;
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dst = ipv6_stub->ipv6_dst_lookup_flow(addr->net, NULL, &fl6, NULL);
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if (IS_ERR(dst))
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return PTR_ERR(dst);
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if (ipv6_addr_any(&src_in->sin6_addr))
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src_in->sin6_addr = fl6.saddr;
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addr->hoplimit = ip6_dst_hoplimit(dst);
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*pdst = dst;
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return 0;
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}
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#else
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static int addr6_resolve(struct sockaddr *src_sock,
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const struct sockaddr *dst_sock,
|
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struct rdma_dev_addr *addr,
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struct dst_entry **pdst)
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{
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return -EADDRNOTAVAIL;
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}
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#endif
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|
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static int addr_resolve_neigh(const struct dst_entry *dst,
|
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const struct sockaddr *dst_in,
|
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struct rdma_dev_addr *addr,
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unsigned int ndev_flags,
|
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u32 seq)
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{
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int ret = 0;
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|
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if (ndev_flags & IFF_LOOPBACK) {
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memcpy(addr->dst_dev_addr, addr->src_dev_addr, MAX_ADDR_LEN);
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} else {
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if (!(ndev_flags & IFF_NOARP)) {
|
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/* If the device doesn't do ARP internally */
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ret = fetch_ha(dst, addr, dst_in, seq);
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}
|
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}
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return ret;
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}
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|
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static int copy_src_l2_addr(struct rdma_dev_addr *dev_addr,
|
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const struct sockaddr *dst_in,
|
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const struct dst_entry *dst,
|
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const struct net_device *ndev)
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|
{
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int ret = 0;
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|
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if (dst->dev->flags & IFF_LOOPBACK)
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ret = rdma_translate_ip(dst_in, dev_addr);
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else
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rdma_copy_src_l2_addr(dev_addr, dst->dev);
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|
|
/*
|
|
* If there's a gateway and type of device not ARPHRD_INFINIBAND,
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|
* we're definitely in RoCE v2 (as RoCE v1 isn't routable) set the
|
|
* network type accordingly.
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|
*/
|
|
if (has_gateway(dst, dst_in->sa_family) &&
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ndev->type != ARPHRD_INFINIBAND)
|
|
dev_addr->network = dst_in->sa_family == AF_INET ?
|
|
RDMA_NETWORK_IPV4 :
|
|
RDMA_NETWORK_IPV6;
|
|
else
|
|
dev_addr->network = RDMA_NETWORK_IB;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rdma_set_src_addr_rcu(struct rdma_dev_addr *dev_addr,
|
|
unsigned int *ndev_flags,
|
|
const struct sockaddr *dst_in,
|
|
const struct dst_entry *dst)
|
|
{
|
|
struct net_device *ndev = READ_ONCE(dst->dev);
|
|
|
|
*ndev_flags = ndev->flags;
|
|
/* A physical device must be the RDMA device to use */
|
|
if (ndev->flags & IFF_LOOPBACK) {
|
|
/*
|
|
* RDMA (IB/RoCE, iWarp) doesn't run on lo interface or
|
|
* loopback IP address. So if route is resolved to loopback
|
|
* interface, translate that to a real ndev based on non
|
|
* loopback IP address.
|
|
*/
|
|
ndev = rdma_find_ndev_for_src_ip_rcu(dev_net(ndev), dst_in);
|
|
if (IS_ERR(ndev))
|
|
return -ENODEV;
|
|
}
|
|
|
|
return copy_src_l2_addr(dev_addr, dst_in, dst, ndev);
|
|
}
|
|
|
|
static int set_addr_netns_by_gid_rcu(struct rdma_dev_addr *addr)
|
|
{
|
|
struct net_device *ndev;
|
|
|
|
ndev = rdma_read_gid_attr_ndev_rcu(addr->sgid_attr);
|
|
if (IS_ERR(ndev))
|
|
return PTR_ERR(ndev);
|
|
|
|
/*
|
|
* Since we are holding the rcu, reading net and ifindex
|
|
* are safe without any additional reference; because
|
|
* change_net_namespace() in net/core/dev.c does rcu sync
|
|
* after it changes the state to IFF_DOWN and before
|
|
* updating netdev fields {net, ifindex}.
|
|
*/
|
|
addr->net = dev_net(ndev);
|
|
addr->bound_dev_if = ndev->ifindex;
|
|
return 0;
|
|
}
|
|
|
|
static void rdma_addr_set_net_defaults(struct rdma_dev_addr *addr)
|
|
{
|
|
addr->net = &init_net;
|
|
addr->bound_dev_if = 0;
|
|
}
|
|
|
|
static int addr_resolve(struct sockaddr *src_in,
|
|
const struct sockaddr *dst_in,
|
|
struct rdma_dev_addr *addr,
|
|
bool resolve_neigh,
|
|
bool resolve_by_gid_attr,
|
|
u32 seq)
|
|
{
|
|
struct dst_entry *dst = NULL;
|
|
unsigned int ndev_flags = 0;
|
|
struct rtable *rt = NULL;
|
|
int ret;
|
|
|
|
if (!addr->net) {
|
|
pr_warn_ratelimited("%s: missing namespace\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
|
|
rcu_read_lock();
|
|
if (resolve_by_gid_attr) {
|
|
if (!addr->sgid_attr) {
|
|
rcu_read_unlock();
|
|
pr_warn_ratelimited("%s: missing gid_attr\n", __func__);
|
|
return -EINVAL;
|
|
}
|
|
/*
|
|
* If the request is for a specific gid attribute of the
|
|
* rdma_dev_addr, derive net from the netdevice of the
|
|
* GID attribute.
|
|
*/
|
|
ret = set_addr_netns_by_gid_rcu(addr);
|
|
if (ret) {
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
}
|
|
if (src_in->sa_family == AF_INET) {
|
|
ret = addr4_resolve(src_in, dst_in, addr, &rt);
|
|
dst = &rt->dst;
|
|
} else {
|
|
ret = addr6_resolve(src_in, dst_in, addr, &dst);
|
|
}
|
|
if (ret) {
|
|
rcu_read_unlock();
|
|
goto done;
|
|
}
|
|
ret = rdma_set_src_addr_rcu(addr, &ndev_flags, dst_in, dst);
|
|
rcu_read_unlock();
|
|
|
|
/*
|
|
* Resolve neighbor destination address if requested and
|
|
* only if src addr translation didn't fail.
|
|
*/
|
|
if (!ret && resolve_neigh)
|
|
ret = addr_resolve_neigh(dst, dst_in, addr, ndev_flags, seq);
|
|
|
|
if (src_in->sa_family == AF_INET)
|
|
ip_rt_put(rt);
|
|
else
|
|
dst_release(dst);
|
|
done:
|
|
/*
|
|
* Clear the addr net to go back to its original state, only if it was
|
|
* derived from GID attribute in this context.
|
|
*/
|
|
if (resolve_by_gid_attr)
|
|
rdma_addr_set_net_defaults(addr);
|
|
return ret;
|
|
}
|
|
|
|
static void process_one_req(struct work_struct *_work)
|
|
{
|
|
struct addr_req *req;
|
|
struct sockaddr *src_in, *dst_in;
|
|
|
|
req = container_of(_work, struct addr_req, work.work);
|
|
|
|
if (req->status == -ENODATA) {
|
|
src_in = (struct sockaddr *)&req->src_addr;
|
|
dst_in = (struct sockaddr *)&req->dst_addr;
|
|
req->status = addr_resolve(src_in, dst_in, req->addr,
|
|
true, req->resolve_by_gid_attr,
|
|
req->seq);
|
|
if (req->status && time_after_eq(jiffies, req->timeout)) {
|
|
req->status = -ETIMEDOUT;
|
|
} else if (req->status == -ENODATA) {
|
|
/* requeue the work for retrying again */
|
|
spin_lock_bh(&lock);
|
|
if (!list_empty(&req->list))
|
|
set_timeout(req, req->timeout);
|
|
spin_unlock_bh(&lock);
|
|
return;
|
|
}
|
|
}
|
|
|
|
req->callback(req->status, (struct sockaddr *)&req->src_addr,
|
|
req->addr, req->context);
|
|
req->callback = NULL;
|
|
|
|
spin_lock_bh(&lock);
|
|
if (!list_empty(&req->list)) {
|
|
/*
|
|
* Although the work will normally have been canceled by the
|
|
* workqueue, it can still be requeued as long as it is on the
|
|
* req_list.
|
|
*/
|
|
cancel_delayed_work(&req->work);
|
|
list_del_init(&req->list);
|
|
kfree(req);
|
|
}
|
|
spin_unlock_bh(&lock);
|
|
}
|
|
|
|
int rdma_resolve_ip(struct sockaddr *src_addr, const struct sockaddr *dst_addr,
|
|
struct rdma_dev_addr *addr, unsigned long timeout_ms,
|
|
void (*callback)(int status, struct sockaddr *src_addr,
|
|
struct rdma_dev_addr *addr, void *context),
|
|
bool resolve_by_gid_attr, void *context)
|
|
{
|
|
struct sockaddr *src_in, *dst_in;
|
|
struct addr_req *req;
|
|
int ret = 0;
|
|
|
|
req = kzalloc(sizeof *req, GFP_KERNEL);
|
|
if (!req)
|
|
return -ENOMEM;
|
|
|
|
src_in = (struct sockaddr *) &req->src_addr;
|
|
dst_in = (struct sockaddr *) &req->dst_addr;
|
|
|
|
if (src_addr) {
|
|
if (src_addr->sa_family != dst_addr->sa_family) {
|
|
ret = -EINVAL;
|
|
goto err;
|
|
}
|
|
|
|
memcpy(src_in, src_addr, rdma_addr_size(src_addr));
|
|
} else {
|
|
src_in->sa_family = dst_addr->sa_family;
|
|
}
|
|
|
|
memcpy(dst_in, dst_addr, rdma_addr_size(dst_addr));
|
|
req->addr = addr;
|
|
req->callback = callback;
|
|
req->context = context;
|
|
req->resolve_by_gid_attr = resolve_by_gid_attr;
|
|
INIT_DELAYED_WORK(&req->work, process_one_req);
|
|
req->seq = (u32)atomic_inc_return(&ib_nl_addr_request_seq);
|
|
|
|
req->status = addr_resolve(src_in, dst_in, addr, true,
|
|
req->resolve_by_gid_attr, req->seq);
|
|
switch (req->status) {
|
|
case 0:
|
|
req->timeout = jiffies;
|
|
queue_req(req);
|
|
break;
|
|
case -ENODATA:
|
|
req->timeout = msecs_to_jiffies(timeout_ms) + jiffies;
|
|
queue_req(req);
|
|
break;
|
|
default:
|
|
ret = req->status;
|
|
goto err;
|
|
}
|
|
return ret;
|
|
err:
|
|
kfree(req);
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(rdma_resolve_ip);
|
|
|
|
int roce_resolve_route_from_path(struct sa_path_rec *rec,
|
|
const struct ib_gid_attr *attr)
|
|
{
|
|
union {
|
|
struct sockaddr _sockaddr;
|
|
struct sockaddr_in _sockaddr_in;
|
|
struct sockaddr_in6 _sockaddr_in6;
|
|
} sgid, dgid;
|
|
struct rdma_dev_addr dev_addr = {};
|
|
int ret;
|
|
|
|
might_sleep();
|
|
|
|
if (rec->roce.route_resolved)
|
|
return 0;
|
|
|
|
rdma_gid2ip((struct sockaddr *)&sgid, &rec->sgid);
|
|
rdma_gid2ip((struct sockaddr *)&dgid, &rec->dgid);
|
|
|
|
if (sgid._sockaddr.sa_family != dgid._sockaddr.sa_family)
|
|
return -EINVAL;
|
|
|
|
if (!attr || !attr->ndev)
|
|
return -EINVAL;
|
|
|
|
dev_addr.net = &init_net;
|
|
dev_addr.sgid_attr = attr;
|
|
|
|
ret = addr_resolve((struct sockaddr *)&sgid, (struct sockaddr *)&dgid,
|
|
&dev_addr, false, true, 0);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if ((dev_addr.network == RDMA_NETWORK_IPV4 ||
|
|
dev_addr.network == RDMA_NETWORK_IPV6) &&
|
|
rec->rec_type != SA_PATH_REC_TYPE_ROCE_V2)
|
|
return -EINVAL;
|
|
|
|
rec->roce.route_resolved = true;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* rdma_addr_cancel - Cancel resolve ip request
|
|
* @addr: Pointer to address structure given previously
|
|
* during rdma_resolve_ip().
|
|
* rdma_addr_cancel() is synchronous function which cancels any pending
|
|
* request if there is any.
|
|
*/
|
|
void rdma_addr_cancel(struct rdma_dev_addr *addr)
|
|
{
|
|
struct addr_req *req, *temp_req;
|
|
struct addr_req *found = NULL;
|
|
|
|
spin_lock_bh(&lock);
|
|
list_for_each_entry_safe(req, temp_req, &req_list, list) {
|
|
if (req->addr == addr) {
|
|
/*
|
|
* Removing from the list means we take ownership of
|
|
* the req
|
|
*/
|
|
list_del_init(&req->list);
|
|
found = req;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_bh(&lock);
|
|
|
|
if (!found)
|
|
return;
|
|
|
|
/*
|
|
* sync canceling the work after removing it from the req_list
|
|
* guarentees no work is running and none will be started.
|
|
*/
|
|
cancel_delayed_work_sync(&found->work);
|
|
kfree(found);
|
|
}
|
|
EXPORT_SYMBOL(rdma_addr_cancel);
|
|
|
|
struct resolve_cb_context {
|
|
struct completion comp;
|
|
int status;
|
|
};
|
|
|
|
static void resolve_cb(int status, struct sockaddr *src_addr,
|
|
struct rdma_dev_addr *addr, void *context)
|
|
{
|
|
((struct resolve_cb_context *)context)->status = status;
|
|
complete(&((struct resolve_cb_context *)context)->comp);
|
|
}
|
|
|
|
int rdma_addr_find_l2_eth_by_grh(const union ib_gid *sgid,
|
|
const union ib_gid *dgid,
|
|
u8 *dmac, const struct ib_gid_attr *sgid_attr,
|
|
int *hoplimit)
|
|
{
|
|
struct rdma_dev_addr dev_addr;
|
|
struct resolve_cb_context ctx;
|
|
union {
|
|
struct sockaddr_in _sockaddr_in;
|
|
struct sockaddr_in6 _sockaddr_in6;
|
|
} sgid_addr, dgid_addr;
|
|
int ret;
|
|
|
|
rdma_gid2ip((struct sockaddr *)&sgid_addr, sgid);
|
|
rdma_gid2ip((struct sockaddr *)&dgid_addr, dgid);
|
|
|
|
memset(&dev_addr, 0, sizeof(dev_addr));
|
|
dev_addr.net = &init_net;
|
|
dev_addr.sgid_attr = sgid_attr;
|
|
|
|
init_completion(&ctx.comp);
|
|
ret = rdma_resolve_ip((struct sockaddr *)&sgid_addr,
|
|
(struct sockaddr *)&dgid_addr, &dev_addr, 1000,
|
|
resolve_cb, true, &ctx);
|
|
if (ret)
|
|
return ret;
|
|
|
|
wait_for_completion(&ctx.comp);
|
|
|
|
ret = ctx.status;
|
|
if (ret)
|
|
return ret;
|
|
|
|
memcpy(dmac, dev_addr.dst_dev_addr, ETH_ALEN);
|
|
*hoplimit = dev_addr.hoplimit;
|
|
return 0;
|
|
}
|
|
|
|
static int netevent_callback(struct notifier_block *self, unsigned long event,
|
|
void *ctx)
|
|
{
|
|
struct addr_req *req;
|
|
|
|
if (event == NETEVENT_NEIGH_UPDATE) {
|
|
struct neighbour *neigh = ctx;
|
|
|
|
if (neigh->nud_state & NUD_VALID) {
|
|
spin_lock_bh(&lock);
|
|
list_for_each_entry(req, &req_list, list)
|
|
set_timeout(req, jiffies);
|
|
spin_unlock_bh(&lock);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static struct notifier_block nb = {
|
|
.notifier_call = netevent_callback
|
|
};
|
|
|
|
int addr_init(void)
|
|
{
|
|
addr_wq = alloc_ordered_workqueue("ib_addr", 0);
|
|
if (!addr_wq)
|
|
return -ENOMEM;
|
|
|
|
register_netevent_notifier(&nb);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void addr_cleanup(void)
|
|
{
|
|
unregister_netevent_notifier(&nb);
|
|
destroy_workqueue(addr_wq);
|
|
WARN_ON(!list_empty(&req_list));
|
|
}
|