136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
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/*
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* Copyright (c) 2020 Mellanox Technologies. All rights reserved.
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*/
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#include <rdma/ib_verbs.h>
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#include <rdma/ib_cache.h>
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#include <rdma/lag.h>
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static struct sk_buff *rdma_build_skb(struct net_device *netdev,
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struct rdma_ah_attr *ah_attr,
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gfp_t flags)
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{
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struct ipv6hdr *ip6h;
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struct sk_buff *skb;
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struct ethhdr *eth;
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struct iphdr *iph;
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struct udphdr *uh;
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u8 smac[ETH_ALEN];
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bool is_ipv4;
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int hdr_len;
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is_ipv4 = ipv6_addr_v4mapped((struct in6_addr *)ah_attr->grh.dgid.raw);
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hdr_len = ETH_HLEN + sizeof(struct udphdr) + LL_RESERVED_SPACE(netdev);
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hdr_len += is_ipv4 ? sizeof(struct iphdr) : sizeof(struct ipv6hdr);
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skb = alloc_skb(hdr_len, flags);
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if (!skb)
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return NULL;
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skb->dev = netdev;
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skb_reserve(skb, hdr_len);
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skb_push(skb, sizeof(struct udphdr));
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skb_reset_transport_header(skb);
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uh = udp_hdr(skb);
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uh->source =
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htons(rdma_flow_label_to_udp_sport(ah_attr->grh.flow_label));
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uh->dest = htons(ROCE_V2_UDP_DPORT);
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uh->len = htons(sizeof(struct udphdr));
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if (is_ipv4) {
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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->frag_off = 0;
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iph->version = 4;
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iph->protocol = IPPROTO_UDP;
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iph->ihl = 0x5;
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iph->tot_len = htons(sizeof(struct udphdr) + sizeof(struct
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iphdr));
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memcpy(&iph->saddr, ah_attr->grh.sgid_attr->gid.raw + 12,
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sizeof(struct in_addr));
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memcpy(&iph->daddr, ah_attr->grh.dgid.raw + 12,
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sizeof(struct in_addr));
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} else {
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skb_push(skb, sizeof(struct ipv6hdr));
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skb_reset_network_header(skb);
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ip6h = ipv6_hdr(skb);
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ip6h->version = 6;
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ip6h->nexthdr = IPPROTO_UDP;
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memcpy(&ip6h->flow_lbl, &ah_attr->grh.flow_label,
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sizeof(*ip6h->flow_lbl));
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memcpy(&ip6h->saddr, ah_attr->grh.sgid_attr->gid.raw,
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sizeof(struct in6_addr));
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memcpy(&ip6h->daddr, ah_attr->grh.dgid.raw,
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sizeof(struct in6_addr));
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}
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skb_push(skb, sizeof(struct ethhdr));
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skb_reset_mac_header(skb);
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eth = eth_hdr(skb);
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skb->protocol = eth->h_proto = htons(is_ipv4 ? ETH_P_IP : ETH_P_IPV6);
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rdma_read_gid_l2_fields(ah_attr->grh.sgid_attr, NULL, smac);
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memcpy(eth->h_source, smac, ETH_ALEN);
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memcpy(eth->h_dest, ah_attr->roce.dmac, ETH_ALEN);
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return skb;
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}
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static struct net_device *rdma_get_xmit_slave_udp(struct ib_device *device,
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struct net_device *master,
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struct rdma_ah_attr *ah_attr,
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gfp_t flags)
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{
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struct net_device *slave;
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struct sk_buff *skb;
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skb = rdma_build_skb(master, ah_attr, flags);
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if (!skb)
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return ERR_PTR(-ENOMEM);
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rcu_read_lock();
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slave = netdev_get_xmit_slave(master, skb,
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!!(device->lag_flags &
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RDMA_LAG_FLAGS_HASH_ALL_SLAVES));
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dev_hold(slave);
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rcu_read_unlock();
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kfree_skb(skb);
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return slave;
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}
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void rdma_lag_put_ah_roce_slave(struct net_device *xmit_slave)
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{
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dev_put(xmit_slave);
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}
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struct net_device *rdma_lag_get_ah_roce_slave(struct ib_device *device,
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struct rdma_ah_attr *ah_attr,
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gfp_t flags)
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{
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struct net_device *slave = NULL;
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struct net_device *master;
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if (!(ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE &&
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ah_attr->grh.sgid_attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP &&
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ah_attr->grh.flow_label))
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return NULL;
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rcu_read_lock();
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master = rdma_read_gid_attr_ndev_rcu(ah_attr->grh.sgid_attr);
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if (IS_ERR(master)) {
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rcu_read_unlock();
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return master;
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}
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dev_hold(master);
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rcu_read_unlock();
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if (!netif_is_bond_master(master))
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goto put;
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slave = rdma_get_xmit_slave_udp(device, master, ah_attr, flags);
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put:
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dev_put(master);
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return slave;
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}
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