ah.c

 1// SPDX-License-Identifier: GPL-2.0-only
 2/*
 3 * Copyright (c) 2024, Microsoft Corporation. All rights reserved.
 4 */
 5
 6#include "mana_ib.h"
 7
 8int mana_ib_create_ah(struct ib_ah *ibah, struct rdma_ah_init_attr *attr,
 9		      struct ib_udata *udata)
10{
11	struct mana_ib_dev *mdev = container_of(ibah->device, struct mana_ib_dev, ib_dev);
12	struct mana_ib_ah *ah = container_of(ibah, struct mana_ib_ah, ibah);
13	struct rdma_ah_attr *ah_attr = attr->ah_attr;
14	const struct ib_global_route *grh;
15	enum rdma_network_type ntype;
16
17	if (ah_attr->type != RDMA_AH_ATTR_TYPE_ROCE ||
18	    !(rdma_ah_get_ah_flags(ah_attr) & IB_AH_GRH))
19		return -EINVAL;
20
21	if (udata)
22		return -EINVAL;
23
24	ah->av = dma_pool_zalloc(mdev->av_pool, GFP_ATOMIC, &ah->dma_handle);
25	if (!ah->av)
26		return -ENOMEM;
27
28	grh = rdma_ah_read_grh(ah_attr);
29	ntype = rdma_gid_attr_network_type(grh->sgid_attr);
30
31	copy_in_reverse(ah->av->dest_mac, ah_attr->roce.dmac, ETH_ALEN);
32	ah->av->udp_src_port = rdma_flow_label_to_udp_sport(grh->flow_label);
33	ah->av->hop_limit = grh->hop_limit;
34	ah->av->dscp = (grh->traffic_class >> 2) & 0x3f;
35	ah->av->is_ipv6 = (ntype == RDMA_NETWORK_IPV6);
36
37	if (ah->av->is_ipv6) {
38		copy_in_reverse(ah->av->dest_ip, grh->dgid.raw, 16);
39		copy_in_reverse(ah->av->src_ip, grh->sgid_attr->gid.raw, 16);
40	} else {
41		ah->av->dest_ip[10] = 0xFF;
42		ah->av->dest_ip[11] = 0xFF;
43		copy_in_reverse(&ah->av->dest_ip[12], &grh->dgid.raw[12], 4);
44		copy_in_reverse(&ah->av->src_ip[12], &grh->sgid_attr->gid.raw[12], 4);
45	}
46
47	return 0;
48}
49
50int mana_ib_destroy_ah(struct ib_ah *ibah, u32 flags)
51{
52	struct mana_ib_dev *mdev = container_of(ibah->device, struct mana_ib_dev, ib_dev);
53	struct mana_ib_ah *ah = container_of(ibah, struct mana_ib_ah, ibah);
54
55	dma_pool_free(mdev->av_pool, ah->av, ah->dma_handle);
56
57	return 0;
58}