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Commit 5097e71f authored by Moni Shoua's avatar Moni Shoua Committed by Doug Ledford
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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: default avatarMoni Shoua <monis@mellanox.com>
Reviewed-by: default avatarYishai Hadas <yishaih@mellanox.com>
Signed-off-by: default avatarLeon Romanovsky <leon@kernel.org>
Signed-off-by: default avatarDoug Ledford <dledford@redhat.com>
parent 477864c8

drivers/infiniband/hw/mlx5/ah.c

+21 −0
Original line number Diff line number Diff line
@@ -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))

		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);

	if (!ah)

		return ERR_PTR(-ENOMEM);

include/uapi/rdma/mlx5-abi.h

+6 −0
Original line number Diff line number Diff line
@@ -249,6 +249,12 @@ struct mlx5_ib_create_wq { 
	__u32   reserved;

};



struct mlx5_ib_create_ah_resp {

	__u32	response_length;

	__u8	dmac[ETH_ALEN];

	__u8	reserved[6];

};



struct mlx5_ib_create_wq_resp {

	__u32	response_length;

	__u32	reserved;