1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
3 * Copyright (c) 2020 Mellanox Technologies. All rights reserved.
6 #include <rdma/ib_verbs.h>
7 #include <rdma/ib_cache.h>
10 static struct sk_buff *rdma_build_skb(struct net_device *netdev,
11 struct rdma_ah_attr *ah_attr,
23 is_ipv4 = ipv6_addr_v4mapped((struct in6_addr *)ah_attr->grh.dgid.raw);
24 hdr_len = ETH_HLEN + sizeof(struct udphdr) + LL_RESERVED_SPACE(netdev);
25 hdr_len += is_ipv4 ? sizeof(struct iphdr) : sizeof(struct ipv6hdr);
27 skb = alloc_skb(hdr_len, flags);
32 skb_reserve(skb, hdr_len);
33 skb_push(skb, sizeof(struct udphdr));
34 skb_reset_transport_header(skb);
37 htons(rdma_flow_label_to_udp_sport(ah_attr->grh.flow_label));
38 uh->dest = htons(ROCE_V2_UDP_DPORT);
39 uh->len = htons(sizeof(struct udphdr));
42 skb_push(skb, sizeof(struct iphdr));
43 skb_reset_network_header(skb);
47 iph->protocol = IPPROTO_UDP;
49 iph->tot_len = htons(sizeof(struct udphdr) + sizeof(struct
51 memcpy(&iph->saddr, ah_attr->grh.sgid_attr->gid.raw + 12,
52 sizeof(struct in_addr));
53 memcpy(&iph->daddr, ah_attr->grh.dgid.raw + 12,
54 sizeof(struct in_addr));
56 skb_push(skb, sizeof(struct ipv6hdr));
57 skb_reset_network_header(skb);
60 ip6h->nexthdr = IPPROTO_UDP;
61 memcpy(&ip6h->flow_lbl, &ah_attr->grh.flow_label,
62 sizeof(*ip6h->flow_lbl));
63 memcpy(&ip6h->saddr, ah_attr->grh.sgid_attr->gid.raw,
64 sizeof(struct in6_addr));
65 memcpy(&ip6h->daddr, ah_attr->grh.dgid.raw,
66 sizeof(struct in6_addr));
69 skb_push(skb, sizeof(struct ethhdr));
70 skb_reset_mac_header(skb);
72 skb->protocol = eth->h_proto = htons(is_ipv4 ? ETH_P_IP : ETH_P_IPV6);
73 rdma_read_gid_l2_fields(ah_attr->grh.sgid_attr, NULL, smac);
74 memcpy(eth->h_source, smac, ETH_ALEN);
75 memcpy(eth->h_dest, ah_attr->roce.dmac, ETH_ALEN);
80 static struct net_device *rdma_get_xmit_slave_udp(struct ib_device *device,
81 struct net_device *master,
82 struct rdma_ah_attr *ah_attr,
85 struct net_device *slave;
88 skb = rdma_build_skb(master, ah_attr, flags);
90 return ERR_PTR(-ENOMEM);
93 slave = netdev_get_xmit_slave(master, skb,
94 !!(device->lag_flags &
95 RDMA_LAG_FLAGS_HASH_ALL_SLAVES));
103 void rdma_lag_put_ah_roce_slave(struct net_device *xmit_slave)
109 struct net_device *rdma_lag_get_ah_roce_slave(struct ib_device *device,
110 struct rdma_ah_attr *ah_attr,
113 struct net_device *slave = NULL;
114 struct net_device *master;
116 if (!(ah_attr->type == RDMA_AH_ATTR_TYPE_ROCE &&
117 ah_attr->grh.sgid_attr->gid_type == IB_GID_TYPE_ROCE_UDP_ENCAP &&
118 ah_attr->grh.flow_label))
122 master = rdma_read_gid_attr_ndev_rcu(ah_attr->grh.sgid_attr);
123 if (IS_ERR(master)) {
130 if (!netif_is_bond_master(master))
133 slave = rdma_get_xmit_slave_udp(device, master, ah_attr, flags);