IB/mlx4: Increase maximal message size under UD QP
Maximal message should be used as a limit to the max message payload allowed,
without the headers. The ConnectX-3 check is done against this value includes
the headers. When the payload is 4K this will cause the NIC to drop packets.
Increase maximal message to 8K as workaround, this shouldn't change current
behaviour because we continue to set the MTU to 4k.
To reproduce;
set MTU to 4296 on the corresponding interface, for example:
ifconfig eth0 mtu 4296 (both server and client)
On server:
ib_send_bw -c UD -d mlx4_0 -s 4096 -n 1000000 -i1 -m 4096
On client:
ib_send_bw -d mlx4_0 -c UD <server_ip> -s 4096 -n 1000000 -i 1 -m 4096
Fixes: 6e0d733d92
("IB/mlx4: Allow 4K messages for UD QPs")
Signed-off-by: Mark Bloch <markb@mellanox.com>
Reviewed-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
parent
ed8637d361
commit
5f22a1d87c
|
@ -2215,7 +2215,7 @@ static int __mlx4_ib_modify_qp(void *src, enum mlx4_ib_source_type src_type,
|
|||
context->mtu_msgmax = (IB_MTU_4096 << 5) |
|
||||
ilog2(dev->dev->caps.max_gso_sz);
|
||||
else
|
||||
context->mtu_msgmax = (IB_MTU_4096 << 5) | 12;
|
||||
context->mtu_msgmax = (IB_MTU_4096 << 5) | 13;
|
||||
} else if (attr_mask & IB_QP_PATH_MTU) {
|
||||
if (attr->path_mtu < IB_MTU_256 || attr->path_mtu > IB_MTU_4096) {
|
||||
pr_err("path MTU (%u) is invalid\n",
|
||||
|
|
Loading…
Reference in a new issue