5097e71f3e
Resolving a MAC address for a given IP address in userspace is inefficient. This patch lets mlx5 user driver using the kernel driver to resolve the mac and get the answer in the private section of the response. Signed-off-by: Moni Shoua <monis@mellanox.com> Reviewed-by: Yishai Hadas <yishaih@mellanox.com> Signed-off-by: Leon Romanovsky <leon@kernel.org> Signed-off-by: Doug Ledford <dledford@redhat.com>
136 lines
4.1 KiB
C
136 lines
4.1 KiB
C
/*
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* Copyright (c) 2013-2015, Mellanox Technologies. 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 "mlx5_ib.h"
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static struct ib_ah *create_ib_ah(struct mlx5_ib_dev *dev,
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struct mlx5_ib_ah *ah,
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struct ib_ah_attr *ah_attr,
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enum rdma_link_layer ll)
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{
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if (ah_attr->ah_flags & IB_AH_GRH) {
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memcpy(ah->av.rgid, &ah_attr->grh.dgid, 16);
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ah->av.grh_gid_fl = cpu_to_be32(ah_attr->grh.flow_label |
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(1 << 30) |
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ah_attr->grh.sgid_index << 20);
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ah->av.hop_limit = ah_attr->grh.hop_limit;
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ah->av.tclass = ah_attr->grh.traffic_class;
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}
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ah->av.stat_rate_sl = (ah_attr->static_rate << 4);
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if (ll == IB_LINK_LAYER_ETHERNET) {
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memcpy(ah->av.rmac, ah_attr->dmac, sizeof(ah_attr->dmac));
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ah->av.udp_sport =
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mlx5_get_roce_udp_sport(dev,
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ah_attr->port_num,
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ah_attr->grh.sgid_index);
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ah->av.stat_rate_sl |= (ah_attr->sl & 0x7) << 1;
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} else {
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ah->av.rlid = cpu_to_be16(ah_attr->dlid);
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ah->av.fl_mlid = ah_attr->src_path_bits & 0x7f;
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ah->av.stat_rate_sl |= (ah_attr->sl & 0xf);
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}
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return &ah->ibah;
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}
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struct ib_ah *mlx5_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
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struct ib_udata *udata)
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{
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struct mlx5_ib_ah *ah;
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struct mlx5_ib_dev *dev = to_mdev(pd->device);
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enum rdma_link_layer ll;
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ll = pd->device->get_link_layer(pd->device, ah_attr->port_num);
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if (ll == IB_LINK_LAYER_ETHERNET && !(ah_attr->ah_flags & IB_AH_GRH))
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return ERR_PTR(-EINVAL);
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if (ll == IB_LINK_LAYER_ETHERNET && udata) {
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int err;
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struct mlx5_ib_create_ah_resp resp = {};
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u32 min_resp_len = offsetof(typeof(resp), dmac) +
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sizeof(resp.dmac);
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if (udata->outlen < min_resp_len)
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return ERR_PTR(-EINVAL);
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resp.response_length = min_resp_len;
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err = ib_resolve_eth_dmac(pd->device, ah_attr);
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if (err)
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return ERR_PTR(err);
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memcpy(resp.dmac, ah_attr->dmac, ETH_ALEN);
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err = ib_copy_to_udata(udata, &resp, resp.response_length);
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if (err)
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return ERR_PTR(err);
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}
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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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return create_ib_ah(dev, ah, ah_attr, ll); /* never fails */
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}
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int mlx5_ib_query_ah(struct ib_ah *ibah, struct ib_ah_attr *ah_attr)
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{
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struct mlx5_ib_ah *ah = to_mah(ibah);
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u32 tmp;
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memset(ah_attr, 0, sizeof(*ah_attr));
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tmp = be32_to_cpu(ah->av.grh_gid_fl);
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if (tmp & (1 << 30)) {
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ah_attr->ah_flags = IB_AH_GRH;
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ah_attr->grh.sgid_index = (tmp >> 20) & 0xff;
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ah_attr->grh.flow_label = tmp & 0xfffff;
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memcpy(&ah_attr->grh.dgid, ah->av.rgid, 16);
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ah_attr->grh.hop_limit = ah->av.hop_limit;
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ah_attr->grh.traffic_class = ah->av.tclass;
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}
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ah_attr->dlid = be16_to_cpu(ah->av.rlid);
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ah_attr->static_rate = ah->av.stat_rate_sl >> 4;
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ah_attr->sl = ah->av.stat_rate_sl & 0xf;
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return 0;
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}
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int mlx5_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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