684 lines
15 KiB
C
684 lines
15 KiB
C
// 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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#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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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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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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/* 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_av *av, struct rxe_pkt_info *pkt,
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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 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_av *av, struct rxe_pkt_info *pkt,
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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 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_av *av, struct rxe_pkt_info *pkt,
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struct sk_buff *skb)
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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(av, pkt, skb);
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else if (skb->protocol == htons(ETH_P_IPV6))
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err = prepare6(av, pkt, skb);
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if (ether_addr_equal(skb->dev->dev_addr, av->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_put(qp);
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}
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static int rxe_send(struct sk_buff *skb, struct rxe_pkt_info *pkt)
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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_get(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_put(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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static int rxe_loopback(struct sk_buff *skb, struct rxe_pkt_info *pkt)
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{
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memcpy(SKB_TO_PKT(skb), pkt, sizeof(*pkt));
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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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return -EIO;
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}
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rxe_rcv(skb);
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return 0;
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}
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int rxe_xmit_packet(struct rxe_qp *qp, struct rxe_pkt_info *pkt,
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struct sk_buff *skb)
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{
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int err;
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int is_request = pkt->mask & RXE_REQ_MASK;
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struct rxe_dev *rxe = to_rdev(qp->ibqp.device);
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if ((is_request && (qp->req.state != QP_STATE_READY)) ||
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(!is_request && (qp->resp.state != QP_STATE_READY))) {
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pr_info("Packet dropped. QP is not in ready state\n");
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goto drop;
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}
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rxe_icrc_generate(skb, pkt);
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if (pkt->mask & RXE_LOOPBACK_MASK)
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err = rxe_loopback(skb, pkt);
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else
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err = rxe_send(skb, pkt);
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if (err) {
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rxe_counter_inc(rxe, RXE_CNT_SEND_ERR);
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return err;
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}
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if ((qp_type(qp) != IB_QPT_RC) &&
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(pkt->mask & RXE_END_MASK)) {
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pkt->wqe->state = wqe_state_done;
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rxe_run_task(&qp->comp.task, 1);
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}
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rxe_counter_inc(rxe, RXE_CNT_SENT_PKTS);
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goto done;
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drop:
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kfree_skb(skb);
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err = 0;
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done:
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return err;
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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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/* 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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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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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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out:
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rdma_put_gid_attr(attr);
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return skb;
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}
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|
|
/*
|
|
* this is required by rxe_cfg to match rxe devices in
|
|
* /sys/class/infiniband up with their underlying ethernet devices
|
|
*/
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|
const char *rxe_parent_name(struct rxe_dev *rxe, unsigned int port_num)
|
|
{
|
|
return rxe->ndev->name;
|
|
}
|
|
|
|
int rxe_net_add(const char *ibdev_name, struct net_device *ndev)
|
|
{
|
|
int err;
|
|
struct rxe_dev *rxe = NULL;
|
|
|
|
rxe = ib_alloc_device(rxe_dev, ib_dev);
|
|
if (!rxe)
|
|
return -ENOMEM;
|
|
|
|
rxe->ndev = ndev;
|
|
|
|
err = rxe_add(rxe, ndev->mtu, ibdev_name);
|
|
if (err) {
|
|
ib_dealloc_device(&rxe->ib_dev);
|
|
return err;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void rxe_port_event(struct rxe_dev *rxe,
|
|
enum ib_event_type event)
|
|
{
|
|
struct ib_event ev;
|
|
|
|
ev.device = &rxe->ib_dev;
|
|
ev.element.port_num = 1;
|
|
ev.event = event;
|
|
|
|
ib_dispatch_event(&ev);
|
|
}
|
|
|
|
/* Caller must hold net_info_lock */
|
|
void rxe_port_up(struct rxe_dev *rxe)
|
|
{
|
|
struct rxe_port *port;
|
|
|
|
port = &rxe->port;
|
|
port->attr.state = IB_PORT_ACTIVE;
|
|
|
|
rxe_port_event(rxe, IB_EVENT_PORT_ACTIVE);
|
|
dev_info(&rxe->ib_dev.dev, "set active\n");
|
|
}
|
|
|
|
/* Caller must hold net_info_lock */
|
|
void rxe_port_down(struct rxe_dev *rxe)
|
|
{
|
|
struct rxe_port *port;
|
|
|
|
port = &rxe->port;
|
|
port->attr.state = IB_PORT_DOWN;
|
|
|
|
rxe_port_event(rxe, IB_EVENT_PORT_ERR);
|
|
rxe_counter_inc(rxe, RXE_CNT_LINK_DOWNED);
|
|
dev_info(&rxe->ib_dev.dev, "set down\n");
|
|
}
|
|
|
|
void rxe_set_port_state(struct rxe_dev *rxe)
|
|
{
|
|
if (netif_running(rxe->ndev) && netif_carrier_ok(rxe->ndev))
|
|
rxe_port_up(rxe);
|
|
else
|
|
rxe_port_down(rxe);
|
|
}
|
|
|
|
static int rxe_notify(struct notifier_block *not_blk,
|
|
unsigned long event,
|
|
void *arg)
|
|
{
|
|
struct net_device *ndev = netdev_notifier_info_to_dev(arg);
|
|
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;
|
|
}
|