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662 lines
14 KiB
662 lines
14 KiB
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB |
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/* |
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* Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved. |
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* Copyright (c) 2015 System Fabric Works, Inc. All rights reserved. |
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*/ |
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|
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#include <linux/skbuff.h> |
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#include <linux/if_arp.h> |
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#include <linux/netdevice.h> |
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#include <linux/if.h> |
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#include <linux/if_vlan.h> |
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#include <net/udp_tunnel.h> |
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#include <net/sch_generic.h> |
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#include <linux/netfilter.h> |
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#include <rdma/ib_addr.h> |
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#include "rxe.h" |
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#include "rxe_net.h" |
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#include "rxe_loc.h" |
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static struct rxe_recv_sockets recv_sockets; |
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int rxe_mcast_add(struct rxe_dev *rxe, union ib_gid *mgid) |
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{ |
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int err; |
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unsigned char ll_addr[ETH_ALEN]; |
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ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr); |
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err = dev_mc_add(rxe->ndev, ll_addr); |
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return err; |
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} |
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int rxe_mcast_delete(struct rxe_dev *rxe, union ib_gid *mgid) |
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{ |
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int err; |
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unsigned char ll_addr[ETH_ALEN]; |
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ipv6_eth_mc_map((struct in6_addr *)mgid->raw, ll_addr); |
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err = dev_mc_del(rxe->ndev, ll_addr); |
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return err; |
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} |
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static struct dst_entry *rxe_find_route4(struct net_device *ndev, |
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struct in_addr *saddr, |
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struct in_addr *daddr) |
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{ |
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struct rtable *rt; |
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struct flowi4 fl = { { 0 } }; |
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|
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memset(&fl, 0, sizeof(fl)); |
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fl.flowi4_oif = ndev->ifindex; |
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memcpy(&fl.saddr, saddr, sizeof(*saddr)); |
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memcpy(&fl.daddr, daddr, sizeof(*daddr)); |
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fl.flowi4_proto = IPPROTO_UDP; |
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rt = ip_route_output_key(&init_net, &fl); |
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if (IS_ERR(rt)) { |
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pr_err_ratelimited("no route to %pI4\n", &daddr->s_addr); |
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return NULL; |
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} |
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return &rt->dst; |
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} |
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#if IS_ENABLED(CONFIG_IPV6) |
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static struct dst_entry *rxe_find_route6(struct net_device *ndev, |
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struct in6_addr *saddr, |
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struct in6_addr *daddr) |
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{ |
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struct dst_entry *ndst; |
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struct flowi6 fl6 = { { 0 } }; |
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memset(&fl6, 0, sizeof(fl6)); |
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fl6.flowi6_oif = ndev->ifindex; |
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memcpy(&fl6.saddr, saddr, sizeof(*saddr)); |
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memcpy(&fl6.daddr, daddr, sizeof(*daddr)); |
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fl6.flowi6_proto = IPPROTO_UDP; |
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ndst = ipv6_stub->ipv6_dst_lookup_flow(sock_net(recv_sockets.sk6->sk), |
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recv_sockets.sk6->sk, &fl6, |
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NULL); |
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if (IS_ERR(ndst)) { |
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pr_err_ratelimited("no route to %pI6\n", daddr); |
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return NULL; |
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} |
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if (unlikely(ndst->error)) { |
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pr_err("no route to %pI6\n", daddr); |
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goto put; |
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} |
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return ndst; |
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put: |
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dst_release(ndst); |
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return NULL; |
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} |
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#else |
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static struct dst_entry *rxe_find_route6(struct net_device *ndev, |
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struct in6_addr *saddr, |
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struct in6_addr *daddr) |
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{ |
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return NULL; |
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} |
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#endif |
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static struct dst_entry *rxe_find_route(struct net_device *ndev, |
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struct rxe_qp *qp, |
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struct rxe_av *av) |
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{ |
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struct dst_entry *dst = NULL; |
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if (qp_type(qp) == IB_QPT_RC) |
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dst = sk_dst_get(qp->sk->sk); |
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if (!dst || !dst_check(dst, qp->dst_cookie)) { |
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if (dst) |
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dst_release(dst); |
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if (av->network_type == RXE_NETWORK_TYPE_IPV4) { |
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struct in_addr *saddr; |
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struct in_addr *daddr; |
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saddr = &av->sgid_addr._sockaddr_in.sin_addr; |
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daddr = &av->dgid_addr._sockaddr_in.sin_addr; |
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dst = rxe_find_route4(ndev, saddr, daddr); |
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} else if (av->network_type == RXE_NETWORK_TYPE_IPV6) { |
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struct in6_addr *saddr6; |
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struct in6_addr *daddr6; |
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saddr6 = &av->sgid_addr._sockaddr_in6.sin6_addr; |
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daddr6 = &av->dgid_addr._sockaddr_in6.sin6_addr; |
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dst = rxe_find_route6(ndev, saddr6, daddr6); |
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#if IS_ENABLED(CONFIG_IPV6) |
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if (dst) |
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qp->dst_cookie = |
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rt6_get_cookie((struct rt6_info *)dst); |
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#endif |
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} |
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if (dst && (qp_type(qp) == IB_QPT_RC)) { |
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dst_hold(dst); |
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sk_dst_set(qp->sk->sk, dst); |
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} |
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} |
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return dst; |
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} |
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static int rxe_udp_encap_recv(struct sock *sk, struct sk_buff *skb) |
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{ |
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struct udphdr *udph; |
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struct rxe_dev *rxe; |
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struct net_device *ndev = skb->dev; |
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struct rxe_pkt_info *pkt = SKB_TO_PKT(skb); |
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|
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/* takes a reference on rxe->ib_dev |
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* drop when skb is freed |
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*/ |
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rxe = rxe_get_dev_from_net(ndev); |
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if (!rxe && is_vlan_dev(ndev)) |
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rxe = rxe_get_dev_from_net(vlan_dev_real_dev(ndev)); |
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if (!rxe) |
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goto drop; |
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if (skb_linearize(skb)) { |
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pr_err("skb_linearize failed\n"); |
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ib_device_put(&rxe->ib_dev); |
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goto drop; |
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} |
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udph = udp_hdr(skb); |
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pkt->rxe = rxe; |
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pkt->port_num = 1; |
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pkt->hdr = (u8 *)(udph + 1); |
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pkt->mask = RXE_GRH_MASK; |
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pkt->paylen = be16_to_cpu(udph->len) - sizeof(*udph); |
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rxe_rcv(skb); |
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return 0; |
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drop: |
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kfree_skb(skb); |
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return 0; |
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} |
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static struct socket *rxe_setup_udp_tunnel(struct net *net, __be16 port, |
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bool ipv6) |
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{ |
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int err; |
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struct socket *sock; |
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struct udp_port_cfg udp_cfg = { }; |
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struct udp_tunnel_sock_cfg tnl_cfg = { }; |
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if (ipv6) { |
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udp_cfg.family = AF_INET6; |
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udp_cfg.ipv6_v6only = 1; |
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} else { |
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udp_cfg.family = AF_INET; |
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} |
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udp_cfg.local_udp_port = port; |
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/* Create UDP socket */ |
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err = udp_sock_create(net, &udp_cfg, &sock); |
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if (err < 0) |
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return ERR_PTR(err); |
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tnl_cfg.encap_type = 1; |
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tnl_cfg.encap_rcv = rxe_udp_encap_recv; |
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/* Setup UDP tunnel */ |
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setup_udp_tunnel_sock(net, sock, &tnl_cfg); |
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return sock; |
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} |
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static void rxe_release_udp_tunnel(struct socket *sk) |
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{ |
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if (sk) |
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udp_tunnel_sock_release(sk); |
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} |
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static void prepare_udp_hdr(struct sk_buff *skb, __be16 src_port, |
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__be16 dst_port) |
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{ |
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struct udphdr *udph; |
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__skb_push(skb, sizeof(*udph)); |
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skb_reset_transport_header(skb); |
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udph = udp_hdr(skb); |
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udph->dest = dst_port; |
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udph->source = src_port; |
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udph->len = htons(skb->len); |
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udph->check = 0; |
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} |
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static void prepare_ipv4_hdr(struct dst_entry *dst, struct sk_buff *skb, |
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__be32 saddr, __be32 daddr, __u8 proto, |
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__u8 tos, __u8 ttl, __be16 df, bool xnet) |
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{ |
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struct iphdr *iph; |
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skb_scrub_packet(skb, xnet); |
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skb_clear_hash(skb); |
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skb_dst_set(skb, dst_clone(dst)); |
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memset(IPCB(skb), 0, sizeof(*IPCB(skb))); |
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skb_push(skb, sizeof(struct iphdr)); |
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skb_reset_network_header(skb); |
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iph = ip_hdr(skb); |
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iph->version = IPVERSION; |
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iph->ihl = sizeof(struct iphdr) >> 2; |
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iph->tot_len = htons(skb->len); |
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iph->frag_off = df; |
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iph->protocol = proto; |
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iph->tos = tos; |
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iph->daddr = daddr; |
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iph->saddr = saddr; |
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iph->ttl = ttl; |
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__ip_select_ident(dev_net(dst->dev), iph, |
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skb_shinfo(skb)->gso_segs ?: 1); |
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} |
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static void prepare_ipv6_hdr(struct dst_entry *dst, struct sk_buff *skb, |
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struct in6_addr *saddr, struct in6_addr *daddr, |
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__u8 proto, __u8 prio, __u8 ttl) |
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{ |
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struct ipv6hdr *ip6h; |
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memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); |
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IPCB(skb)->flags &= ~(IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED |
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| IPSKB_REROUTED); |
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skb_dst_set(skb, dst_clone(dst)); |
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__skb_push(skb, sizeof(*ip6h)); |
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skb_reset_network_header(skb); |
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ip6h = ipv6_hdr(skb); |
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ip6_flow_hdr(ip6h, prio, htonl(0)); |
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ip6h->payload_len = htons(skb->len); |
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ip6h->nexthdr = proto; |
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ip6h->hop_limit = ttl; |
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ip6h->daddr = *daddr; |
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ip6h->saddr = *saddr; |
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ip6h->payload_len = htons(skb->len - sizeof(*ip6h)); |
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} |
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static int prepare4(struct rxe_pkt_info *pkt, struct sk_buff *skb) |
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{ |
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struct rxe_qp *qp = pkt->qp; |
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struct dst_entry *dst; |
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bool xnet = false; |
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__be16 df = htons(IP_DF); |
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struct rxe_av *av = rxe_get_av(pkt); |
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struct in_addr *saddr = &av->sgid_addr._sockaddr_in.sin_addr; |
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struct in_addr *daddr = &av->dgid_addr._sockaddr_in.sin_addr; |
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dst = rxe_find_route(skb->dev, qp, av); |
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if (!dst) { |
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pr_err("Host not reachable\n"); |
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return -EHOSTUNREACH; |
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} |
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prepare_udp_hdr(skb, cpu_to_be16(qp->src_port), |
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cpu_to_be16(ROCE_V2_UDP_DPORT)); |
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prepare_ipv4_hdr(dst, skb, saddr->s_addr, daddr->s_addr, IPPROTO_UDP, |
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av->grh.traffic_class, av->grh.hop_limit, df, xnet); |
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dst_release(dst); |
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return 0; |
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} |
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static int prepare6(struct rxe_pkt_info *pkt, struct sk_buff *skb) |
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{ |
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struct rxe_qp *qp = pkt->qp; |
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struct dst_entry *dst; |
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struct rxe_av *av = rxe_get_av(pkt); |
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struct in6_addr *saddr = &av->sgid_addr._sockaddr_in6.sin6_addr; |
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struct in6_addr *daddr = &av->dgid_addr._sockaddr_in6.sin6_addr; |
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dst = rxe_find_route(skb->dev, qp, av); |
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if (!dst) { |
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pr_err("Host not reachable\n"); |
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return -EHOSTUNREACH; |
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} |
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prepare_udp_hdr(skb, cpu_to_be16(qp->src_port), |
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cpu_to_be16(ROCE_V2_UDP_DPORT)); |
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prepare_ipv6_hdr(dst, skb, saddr, daddr, IPPROTO_UDP, |
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av->grh.traffic_class, |
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av->grh.hop_limit); |
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dst_release(dst); |
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return 0; |
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} |
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int rxe_prepare(struct rxe_pkt_info *pkt, struct sk_buff *skb, u32 *crc) |
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{ |
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int err = 0; |
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if (skb->protocol == htons(ETH_P_IP)) |
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err = prepare4(pkt, skb); |
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else if (skb->protocol == htons(ETH_P_IPV6)) |
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err = prepare6(pkt, skb); |
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*crc = rxe_icrc_hdr(pkt, skb); |
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if (ether_addr_equal(skb->dev->dev_addr, rxe_get_av(pkt)->dmac)) |
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pkt->mask |= RXE_LOOPBACK_MASK; |
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return err; |
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} |
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static void rxe_skb_tx_dtor(struct sk_buff *skb) |
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{ |
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struct sock *sk = skb->sk; |
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struct rxe_qp *qp = sk->sk_user_data; |
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int skb_out = atomic_dec_return(&qp->skb_out); |
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if (unlikely(qp->need_req_skb && |
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skb_out < RXE_INFLIGHT_SKBS_PER_QP_LOW)) |
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rxe_run_task(&qp->req.task, 1); |
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rxe_drop_ref(qp); |
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} |
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int rxe_send(struct rxe_pkt_info *pkt, struct sk_buff *skb) |
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{ |
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int err; |
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skb->destructor = rxe_skb_tx_dtor; |
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skb->sk = pkt->qp->sk->sk; |
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rxe_add_ref(pkt->qp); |
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atomic_inc(&pkt->qp->skb_out); |
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if (skb->protocol == htons(ETH_P_IP)) { |
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err = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
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} else if (skb->protocol == htons(ETH_P_IPV6)) { |
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err = ip6_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb); |
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} else { |
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pr_err("Unknown layer 3 protocol: %d\n", skb->protocol); |
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atomic_dec(&pkt->qp->skb_out); |
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rxe_drop_ref(pkt->qp); |
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kfree_skb(skb); |
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return -EINVAL; |
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} |
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if (unlikely(net_xmit_eval(err))) { |
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pr_debug("error sending packet: %d\n", err); |
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return -EAGAIN; |
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} |
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return 0; |
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} |
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/* fix up a send packet to match the packets |
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* received from UDP before looping them back |
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*/ |
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void rxe_loopback(struct sk_buff *skb) |
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{ |
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struct rxe_pkt_info *pkt = SKB_TO_PKT(skb); |
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if (skb->protocol == htons(ETH_P_IP)) |
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skb_pull(skb, sizeof(struct iphdr)); |
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else |
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skb_pull(skb, sizeof(struct ipv6hdr)); |
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if (WARN_ON(!ib_device_try_get(&pkt->rxe->ib_dev))) |
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kfree_skb(skb); |
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else |
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rxe_rcv(skb); |
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} |
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struct sk_buff *rxe_init_packet(struct rxe_dev *rxe, struct rxe_av *av, |
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int paylen, struct rxe_pkt_info *pkt) |
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{ |
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unsigned int hdr_len; |
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struct sk_buff *skb = NULL; |
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struct net_device *ndev; |
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const struct ib_gid_attr *attr; |
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const int port_num = 1; |
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attr = rdma_get_gid_attr(&rxe->ib_dev, port_num, av->grh.sgid_index); |
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if (IS_ERR(attr)) |
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return NULL; |
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if (av->network_type == RXE_NETWORK_TYPE_IPV4) |
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hdr_len = ETH_HLEN + sizeof(struct udphdr) + |
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sizeof(struct iphdr); |
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else |
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hdr_len = ETH_HLEN + sizeof(struct udphdr) + |
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sizeof(struct ipv6hdr); |
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rcu_read_lock(); |
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ndev = rdma_read_gid_attr_ndev_rcu(attr); |
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if (IS_ERR(ndev)) { |
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rcu_read_unlock(); |
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goto out; |
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} |
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skb = alloc_skb(paylen + hdr_len + LL_RESERVED_SPACE(ndev), |
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GFP_ATOMIC); |
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if (unlikely(!skb)) { |
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rcu_read_unlock(); |
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goto out; |
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} |
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skb_reserve(skb, hdr_len + LL_RESERVED_SPACE(ndev)); |
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|
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/* FIXME: hold reference to this netdev until life of this skb. */ |
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skb->dev = ndev; |
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rcu_read_unlock(); |
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|
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if (av->network_type == RXE_NETWORK_TYPE_IPV4) |
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skb->protocol = htons(ETH_P_IP); |
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else |
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skb->protocol = htons(ETH_P_IPV6); |
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|
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pkt->rxe = rxe; |
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pkt->port_num = port_num; |
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pkt->hdr = skb_put(skb, paylen); |
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pkt->mask |= RXE_GRH_MASK; |
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|
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out: |
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rdma_put_gid_attr(attr); |
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return skb; |
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} |
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|
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/* |
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* this is required by rxe_cfg to match rxe devices in |
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* /sys/class/infiniband up with their underlying ethernet devices |
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*/ |
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const char *rxe_parent_name(struct rxe_dev *rxe, unsigned int port_num) |
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{ |
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return rxe->ndev->name; |
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} |
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int rxe_net_add(const char *ibdev_name, struct net_device *ndev) |
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{ |
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int err; |
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struct rxe_dev *rxe = NULL; |
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|
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rxe = ib_alloc_device(rxe_dev, ib_dev); |
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if (!rxe) |
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return -ENOMEM; |
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|
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rxe->ndev = ndev; |
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|
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err = rxe_add(rxe, ndev->mtu, ibdev_name); |
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if (err) { |
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ib_dealloc_device(&rxe->ib_dev); |
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return err; |
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} |
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return 0; |
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} |
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|
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static void rxe_port_event(struct rxe_dev *rxe, |
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enum ib_event_type event) |
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{ |
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struct ib_event ev; |
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ev.device = &rxe->ib_dev; |
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ev.element.port_num = 1; |
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ev.event = event; |
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|
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ib_dispatch_event(&ev); |
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} |
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|
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/* Caller must hold net_info_lock */ |
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void rxe_port_up(struct rxe_dev *rxe) |
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{ |
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struct rxe_port *port; |
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|
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port = &rxe->port; |
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port->attr.state = IB_PORT_ACTIVE; |
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|
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rxe_port_event(rxe, IB_EVENT_PORT_ACTIVE); |
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dev_info(&rxe->ib_dev.dev, "set active\n"); |
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} |
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|
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/* Caller must hold net_info_lock */ |
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void rxe_port_down(struct rxe_dev *rxe) |
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{ |
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struct rxe_port *port; |
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|
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port = &rxe->port; |
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port->attr.state = IB_PORT_DOWN; |
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|
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rxe_port_event(rxe, IB_EVENT_PORT_ERR); |
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rxe_counter_inc(rxe, RXE_CNT_LINK_DOWNED); |
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dev_info(&rxe->ib_dev.dev, "set down\n"); |
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} |
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|
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void rxe_set_port_state(struct rxe_dev *rxe) |
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{ |
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if (netif_running(rxe->ndev) && netif_carrier_ok(rxe->ndev)) |
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rxe_port_up(rxe); |
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else |
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rxe_port_down(rxe); |
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} |
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|
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static int rxe_notify(struct notifier_block *not_blk, |
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unsigned long event, |
|
void *arg) |
|
{ |
|
struct net_device *ndev = netdev_notifier_info_to_dev(arg); |
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struct rxe_dev *rxe = rxe_get_dev_from_net(ndev); |
|
|
|
if (!rxe) |
|
return NOTIFY_OK; |
|
|
|
switch (event) { |
|
case NETDEV_UNREGISTER: |
|
ib_unregister_device_queued(&rxe->ib_dev); |
|
break; |
|
case NETDEV_UP: |
|
rxe_port_up(rxe); |
|
break; |
|
case NETDEV_DOWN: |
|
rxe_port_down(rxe); |
|
break; |
|
case NETDEV_CHANGEMTU: |
|
pr_info("%s changed mtu to %d\n", ndev->name, ndev->mtu); |
|
rxe_set_mtu(rxe, ndev->mtu); |
|
break; |
|
case NETDEV_CHANGE: |
|
rxe_set_port_state(rxe); |
|
break; |
|
case NETDEV_REBOOT: |
|
case NETDEV_GOING_DOWN: |
|
case NETDEV_CHANGEADDR: |
|
case NETDEV_CHANGENAME: |
|
case NETDEV_FEAT_CHANGE: |
|
default: |
|
pr_info("ignoring netdev event = %ld for %s\n", |
|
event, ndev->name); |
|
break; |
|
} |
|
|
|
ib_device_put(&rxe->ib_dev); |
|
return NOTIFY_OK; |
|
} |
|
|
|
static struct notifier_block rxe_net_notifier = { |
|
.notifier_call = rxe_notify, |
|
}; |
|
|
|
static int rxe_net_ipv4_init(void) |
|
{ |
|
recv_sockets.sk4 = rxe_setup_udp_tunnel(&init_net, |
|
htons(ROCE_V2_UDP_DPORT), false); |
|
if (IS_ERR(recv_sockets.sk4)) { |
|
recv_sockets.sk4 = NULL; |
|
pr_err("Failed to create IPv4 UDP tunnel\n"); |
|
return -1; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int rxe_net_ipv6_init(void) |
|
{ |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
|
|
recv_sockets.sk6 = rxe_setup_udp_tunnel(&init_net, |
|
htons(ROCE_V2_UDP_DPORT), true); |
|
if (PTR_ERR(recv_sockets.sk6) == -EAFNOSUPPORT) { |
|
recv_sockets.sk6 = NULL; |
|
pr_warn("IPv6 is not supported, can not create a UDPv6 socket\n"); |
|
return 0; |
|
} |
|
|
|
if (IS_ERR(recv_sockets.sk6)) { |
|
recv_sockets.sk6 = NULL; |
|
pr_err("Failed to create IPv6 UDP tunnel\n"); |
|
return -1; |
|
} |
|
#endif |
|
return 0; |
|
} |
|
|
|
void rxe_net_exit(void) |
|
{ |
|
rxe_release_udp_tunnel(recv_sockets.sk6); |
|
rxe_release_udp_tunnel(recv_sockets.sk4); |
|
unregister_netdevice_notifier(&rxe_net_notifier); |
|
} |
|
|
|
int rxe_net_init(void) |
|
{ |
|
int err; |
|
|
|
recv_sockets.sk6 = NULL; |
|
|
|
err = rxe_net_ipv4_init(); |
|
if (err) |
|
return err; |
|
err = rxe_net_ipv6_init(); |
|
if (err) |
|
goto err_out; |
|
err = register_netdevice_notifier(&rxe_net_notifier); |
|
if (err) { |
|
pr_err("Failed to register netdev notifier\n"); |
|
goto err_out; |
|
} |
|
return 0; |
|
err_out: |
|
rxe_net_exit(); |
|
return err; |
|
}
|
|
|