729 lines
16 KiB
C
729 lines
16 KiB
C
/*
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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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* 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/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 LIST_HEAD(rxe_dev_list);
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static DEFINE_SPINLOCK(dev_list_lock); /* spinlock for device list */
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struct rxe_dev *net_to_rxe(struct net_device *ndev)
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{
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struct rxe_dev *rxe;
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struct rxe_dev *found = NULL;
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spin_lock_bh(&dev_list_lock);
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list_for_each_entry(rxe, &rxe_dev_list, list) {
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if (rxe->ndev == ndev) {
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found = rxe;
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break;
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}
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}
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spin_unlock_bh(&dev_list_lock);
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return found;
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}
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struct rxe_dev *get_rxe_by_name(const char *name)
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{
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struct rxe_dev *rxe;
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struct rxe_dev *found = NULL;
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spin_lock_bh(&dev_list_lock);
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list_for_each_entry(rxe, &rxe_dev_list, list) {
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if (!strcmp(name, rxe->ib_dev.name)) {
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found = rxe;
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break;
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}
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}
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spin_unlock_bh(&dev_list_lock);
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return found;
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}
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static struct rxe_recv_sockets recv_sockets;
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struct device *rxe_dma_device(struct rxe_dev *rxe)
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{
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struct net_device *ndev;
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ndev = rxe->ndev;
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if (is_vlan_dev(ndev))
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ndev = vlan_dev_real_dev(ndev);
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return ndev->dev.parent;
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}
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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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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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if (unlikely(ipv6_stub->ipv6_dst_lookup(sock_net(recv_sockets.sk6->sk),
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recv_sockets.sk6->sk, &ndst, &fl6))) {
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pr_err_ratelimited("no route to %pI6\n", daddr);
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goto put;
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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 rxe_dev *rxe,
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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 == RDMA_NETWORK_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(rxe->ndev, saddr, daddr);
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} else if (av->network_type == RDMA_NETWORK_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(rxe->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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}
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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 net_device *ndev = skb->dev;
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struct rxe_dev *rxe = net_to_rxe(ndev);
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struct rxe_pkt_info *pkt = SKB_TO_PKT(skb);
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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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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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return rxe_rcv(skb);
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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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pr_err("failed to create udp socket. err = %d\n", err);
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return ERR_PTR(err);
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}
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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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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->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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iph->tot_len = htons(skb->len);
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ip_send_check(iph);
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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_dev *rxe, struct rxe_pkt_info *pkt,
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struct sk_buff *skb, struct rxe_av *av)
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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(rxe, 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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if (!memcmp(saddr, daddr, sizeof(*daddr)))
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pkt->mask |= RXE_LOOPBACK_MASK;
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prepare_udp_hdr(skb, htons(RXE_ROCE_V2_SPORT),
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htons(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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if (qp_type(qp) == IB_QPT_RC)
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sk_dst_set(qp->sk->sk, dst);
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else
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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_dev *rxe, struct rxe_pkt_info *pkt,
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struct sk_buff *skb, struct rxe_av *av)
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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(rxe, 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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if (!memcmp(saddr, daddr, sizeof(*daddr)))
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pkt->mask |= RXE_LOOPBACK_MASK;
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prepare_udp_hdr(skb, htons(RXE_ROCE_V2_SPORT),
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htons(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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if (qp_type(qp) == IB_QPT_RC)
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sk_dst_set(qp->sk->sk, dst);
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else
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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_dev *rxe, struct rxe_pkt_info *pkt,
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struct sk_buff *skb, u32 *crc)
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{
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int err = 0;
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struct rxe_av *av = rxe_get_av(pkt);
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if (av->network_type == RDMA_NETWORK_IPV4)
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err = prepare4(rxe, pkt, skb, av);
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else if (av->network_type == RDMA_NETWORK_IPV6)
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err = prepare6(rxe, pkt, skb, av);
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*crc = rxe_icrc_hdr(pkt, skb);
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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_dev *rxe, struct rxe_pkt_info *pkt, struct sk_buff *skb)
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{
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struct rxe_av *av;
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int err;
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av = rxe_get_av(pkt);
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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 (av->network_type == RDMA_NETWORK_IPV4) {
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err = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
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} else if (av->network_type == RDMA_NETWORK_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", av->network_type);
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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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int rxe_loopback(struct sk_buff *skb)
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{
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return rxe_rcv(skb);
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}
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static inline int addr_same(struct rxe_dev *rxe, struct rxe_av *av)
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{
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return rxe->port.port_guid == av->grh.dgid.global.interface_id;
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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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{
|
|
unsigned int hdr_len;
|
|
struct sk_buff *skb;
|
|
|
|
if (av->network_type == RDMA_NETWORK_IPV4)
|
|
hdr_len = ETH_HLEN + sizeof(struct udphdr) +
|
|
sizeof(struct iphdr);
|
|
else
|
|
hdr_len = ETH_HLEN + sizeof(struct udphdr) +
|
|
sizeof(struct ipv6hdr);
|
|
|
|
skb = alloc_skb(paylen + hdr_len + LL_RESERVED_SPACE(rxe->ndev),
|
|
GFP_ATOMIC);
|
|
if (unlikely(!skb))
|
|
return NULL;
|
|
|
|
skb_reserve(skb, hdr_len + LL_RESERVED_SPACE(rxe->ndev));
|
|
|
|
skb->dev = rxe->ndev;
|
|
if (av->network_type == RDMA_NETWORK_IPV4)
|
|
skb->protocol = htons(ETH_P_IP);
|
|
else
|
|
skb->protocol = htons(ETH_P_IPV6);
|
|
|
|
pkt->rxe = rxe;
|
|
pkt->port_num = 1;
|
|
pkt->hdr = skb_put(skb, paylen);
|
|
pkt->mask |= RXE_GRH_MASK;
|
|
|
|
memset(pkt->hdr, 0, paylen);
|
|
|
|
return skb;
|
|
}
|
|
|
|
/*
|
|
* this is required by rxe_cfg to match rxe devices in
|
|
* /sys/class/infiniband up with their underlying ethernet devices
|
|
*/
|
|
const char *rxe_parent_name(struct rxe_dev *rxe, unsigned int port_num)
|
|
{
|
|
return rxe->ndev->name;
|
|
}
|
|
|
|
enum rdma_link_layer rxe_link_layer(struct rxe_dev *rxe, unsigned int port_num)
|
|
{
|
|
return IB_LINK_LAYER_ETHERNET;
|
|
}
|
|
|
|
struct rxe_dev *rxe_net_add(struct net_device *ndev)
|
|
{
|
|
int err;
|
|
struct rxe_dev *rxe = NULL;
|
|
|
|
rxe = (struct rxe_dev *)ib_alloc_device(sizeof(*rxe));
|
|
if (!rxe)
|
|
return NULL;
|
|
|
|
rxe->ndev = ndev;
|
|
|
|
err = rxe_add(rxe, ndev->mtu);
|
|
if (err) {
|
|
ib_dealloc_device(&rxe->ib_dev);
|
|
return NULL;
|
|
}
|
|
|
|
spin_lock_bh(&dev_list_lock);
|
|
list_add_tail(&rxe->list, &rxe_dev_list);
|
|
spin_unlock_bh(&dev_list_lock);
|
|
return rxe;
|
|
}
|
|
|
|
void rxe_remove_all(void)
|
|
{
|
|
spin_lock_bh(&dev_list_lock);
|
|
while (!list_empty(&rxe_dev_list)) {
|
|
struct rxe_dev *rxe =
|
|
list_first_entry(&rxe_dev_list, struct rxe_dev, list);
|
|
|
|
list_del(&rxe->list);
|
|
spin_unlock_bh(&dev_list_lock);
|
|
rxe_remove(rxe);
|
|
spin_lock_bh(&dev_list_lock);
|
|
}
|
|
spin_unlock_bh(&dev_list_lock);
|
|
}
|
|
EXPORT_SYMBOL(rxe_remove_all);
|
|
|
|
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;
|
|
port->attr.phys_state = IB_PHYS_STATE_LINK_UP;
|
|
|
|
rxe_port_event(rxe, IB_EVENT_PORT_ACTIVE);
|
|
pr_info("set %s active\n", rxe->ib_dev.name);
|
|
}
|
|
|
|
/* 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;
|
|
port->attr.phys_state = IB_PHYS_STATE_LINK_DOWN;
|
|
|
|
rxe_port_event(rxe, IB_EVENT_PORT_ERR);
|
|
pr_info("set %s down\n", rxe->ib_dev.name);
|
|
}
|
|
|
|
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 = net_to_rxe(ndev);
|
|
|
|
if (!rxe)
|
|
goto out;
|
|
|
|
switch (event) {
|
|
case NETDEV_UNREGISTER:
|
|
list_del(&rxe->list);
|
|
rxe_remove(rxe);
|
|
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:
|
|
if (netif_running(ndev) && netif_carrier_ok(ndev))
|
|
rxe_port_up(rxe);
|
|
else
|
|
rxe_port_down(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;
|
|
}
|
|
out:
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
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 (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;
|
|
}
|