200 lines
6.1 KiB
C
200 lines
6.1 KiB
C
/*
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* Copyright (c) 2007 Cisco Systems, 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 <rdma/ib_addr.h>
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#include <rdma/ib_cache.h>
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#include <linux/slab.h>
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#include <linux/inet.h>
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#include <linux/string.h>
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#include "mlx4_ib.h"
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int mlx4_ib_resolve_grh(struct mlx4_ib_dev *dev, const struct ib_ah_attr *ah_attr,
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u8 *mac, int *is_mcast, u8 port)
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{
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struct in6_addr in6;
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*is_mcast = 0;
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memcpy(&in6, ah_attr->grh.dgid.raw, sizeof in6);
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if (rdma_link_local_addr(&in6))
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rdma_get_ll_mac(&in6, mac);
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else if (rdma_is_multicast_addr(&in6)) {
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rdma_get_mcast_mac(&in6, mac);
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*is_mcast = 1;
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} else
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return -EINVAL;
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return 0;
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}
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static struct ib_ah *create_ib_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
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struct mlx4_ib_ah *ah)
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{
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struct mlx4_dev *dev = to_mdev(pd->device)->dev;
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ah->av.ib.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
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ah->av.ib.g_slid = ah_attr->src_path_bits;
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if (ah_attr->ah_flags & IB_AH_GRH) {
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ah->av.ib.g_slid |= 0x80;
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ah->av.ib.gid_index = ah_attr->grh.sgid_index;
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ah->av.ib.hop_limit = ah_attr->grh.hop_limit;
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ah->av.ib.sl_tclass_flowlabel |=
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cpu_to_be32((ah_attr->grh.traffic_class << 20) |
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ah_attr->grh.flow_label);
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memcpy(ah->av.ib.dgid, ah_attr->grh.dgid.raw, 16);
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}
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ah->av.ib.dlid = cpu_to_be16(ah_attr->dlid);
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if (ah_attr->static_rate) {
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ah->av.ib.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
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while (ah->av.ib.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
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!(1 << ah->av.ib.stat_rate & dev->caps.stat_rate_support))
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--ah->av.ib.stat_rate;
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}
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ah->av.ib.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 28);
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return &ah->ibah;
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}
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static struct ib_ah *create_iboe_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
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struct mlx4_ib_ah *ah)
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{
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struct mlx4_ib_dev *ibdev = to_mdev(pd->device);
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struct mlx4_dev *dev = ibdev->dev;
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union ib_gid sgid;
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u8 mac[6];
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int err;
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int is_mcast;
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u16 vlan_tag;
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err = mlx4_ib_resolve_grh(ibdev, ah_attr, mac, &is_mcast, ah_attr->port_num);
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if (err)
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return ERR_PTR(err);
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memcpy(ah->av.eth.mac, mac, 6);
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err = ib_get_cached_gid(pd->device, ah_attr->port_num, ah_attr->grh.sgid_index, &sgid);
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if (err)
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return ERR_PTR(err);
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vlan_tag = rdma_get_vlan_id(&sgid);
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if (vlan_tag < 0x1000)
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vlan_tag |= (ah_attr->sl & 7) << 13;
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ah->av.eth.port_pd = cpu_to_be32(to_mpd(pd)->pdn | (ah_attr->port_num << 24));
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ah->av.eth.gid_index = ah_attr->grh.sgid_index;
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ah->av.eth.vlan = cpu_to_be16(vlan_tag);
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if (ah_attr->static_rate) {
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ah->av.eth.stat_rate = ah_attr->static_rate + MLX4_STAT_RATE_OFFSET;
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while (ah->av.eth.stat_rate > IB_RATE_2_5_GBPS + MLX4_STAT_RATE_OFFSET &&
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!(1 << ah->av.eth.stat_rate & dev->caps.stat_rate_support))
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--ah->av.eth.stat_rate;
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}
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/*
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* HW requires multicast LID so we just choose one.
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*/
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if (is_mcast)
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ah->av.ib.dlid = cpu_to_be16(0xc000);
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memcpy(ah->av.eth.dgid, ah_attr->grh.dgid.raw, 16);
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ah->av.eth.sl_tclass_flowlabel = cpu_to_be32(ah_attr->sl << 29);
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return &ah->ibah;
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}
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struct ib_ah *mlx4_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr)
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{
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struct mlx4_ib_ah *ah;
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struct ib_ah *ret;
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ah = kzalloc(sizeof *ah, GFP_ATOMIC);
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if (!ah)
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return ERR_PTR(-ENOMEM);
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if (rdma_port_get_link_layer(pd->device, ah_attr->port_num) == IB_LINK_LAYER_ETHERNET) {
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if (!(ah_attr->ah_flags & IB_AH_GRH)) {
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ret = ERR_PTR(-EINVAL);
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} else {
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/*
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* TBD: need to handle the case when we get
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* called in an atomic context and there we
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* might sleep. We don't expect this
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* currently since we're working with link
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* local addresses which we can translate
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* without going to sleep.
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*/
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ret = create_iboe_ah(pd, ah_attr, ah);
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}
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if (IS_ERR(ret))
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kfree(ah);
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return ret;
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} else
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return create_ib_ah(pd, ah_attr, ah); /* never fails */
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}
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int mlx4_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
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{
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struct mlx4_ib_ah *ah = to_mah(ibah);
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enum rdma_link_layer ll;
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memset(ah_attr, 0, sizeof *ah_attr);
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ah_attr->sl = be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 28;
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ah_attr->port_num = be32_to_cpu(ah->av.ib.port_pd) >> 24;
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ll = rdma_port_get_link_layer(ibah->device, ah_attr->port_num);
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ah_attr->dlid = ll == IB_LINK_LAYER_INFINIBAND ? be16_to_cpu(ah->av.ib.dlid) : 0;
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if (ah->av.ib.stat_rate)
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ah_attr->static_rate = ah->av.ib.stat_rate - MLX4_STAT_RATE_OFFSET;
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ah_attr->src_path_bits = ah->av.ib.g_slid & 0x7F;
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if (mlx4_ib_ah_grh_present(ah)) {
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ah_attr->ah_flags = IB_AH_GRH;
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ah_attr->grh.traffic_class =
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be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) >> 20;
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ah_attr->grh.flow_label =
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be32_to_cpu(ah->av.ib.sl_tclass_flowlabel) & 0xfffff;
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ah_attr->grh.hop_limit = ah->av.ib.hop_limit;
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ah_attr->grh.sgid_index = ah->av.ib.gid_index;
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memcpy(ah_attr->grh.dgid.raw, ah->av.ib.dgid, 16);
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}
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return 0;
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}
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int mlx4_ib_destroy_ah(struct ib_ah *ah)
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{
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kfree(to_mah(ah));
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return 0;
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}
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