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IB/mlx5: Use kernel driver to help userspace create ah 

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>
This commit is contained in:
Moni Shoua 2016-11-23 08:23:25 +02:00 committed by Doug Ledford
parent 477864c8fc
commit 5097e71f3e
2 changed files with 27 additions and 0 deletions
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21
drivers/infiniband/hw/mlx5/ah.c
View File

@ -77,6 +77,27 @@ struct ib_ah *mlx5_ib_create_ah(struct ib_pd *pd, struct ib_ah_attr *ah_attr,
if (ll == IB_LINK_LAYER_ETHERNET && !(ah_attr->ah_flags & IB_AH_GRH)) if (ll == IB_LINK_LAYER_ETHERNET && !(ah_attr->ah_flags & IB_AH_GRH))
return ERR_PTR(-EINVAL); return ERR_PTR(-EINVAL);
if (ll == IB_LINK_LAYER_ETHERNET && udata) {
int err;
struct mlx5_ib_create_ah_resp resp = {};
u32 min_resp_len = offsetof(typeof(resp), dmac) +
sizeof(resp.dmac);
if (udata->outlen < min_resp_len)
return ERR_PTR(-EINVAL);
resp.response_length = min_resp_len;
err = ib_resolve_eth_dmac(pd->device, ah_attr);
if (err)
return ERR_PTR(err);
memcpy(resp.dmac, ah_attr->dmac, ETH_ALEN);
err = ib_copy_to_udata(udata, &resp, resp.response_length);
if (err)
return ERR_PTR(err);
}
ah = kzalloc(sizeof(*ah), GFP_ATOMIC); ah = kzalloc(sizeof(*ah), GFP_ATOMIC);
if (!ah) if (!ah)
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);

6
include/uapi/rdma/mlx5-abi.h
View File

@ -249,6 +249,12 @@ struct mlx5_ib_create_wq {
__u32 reserved; __u32 reserved;
}; };
struct mlx5_ib_create_ah_resp {
__u32 response_length;
__u8 dmac[ETH_ALEN];
__u8 reserved[6];
};
struct mlx5_ib_create_wq_resp { struct mlx5_ib_create_wq_resp {
__u32 response_length; __u32 response_length;
__u32 reserved; __u32 reserved;