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authorMark Bloch <markb@mellanox.com>2017-11-02 15:22:26 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-12-16 10:32:31 +0100
commit2db29fb2d2492068e26b97ce17cf059965bbdb56 (patch)
treef27396c02698a6985e11d6d573315f4aeeef0e7b
parent63ec9868ebe393c5b04388bc2046fc96e4d94cac (diff)
downloadlinux-rt-2db29fb2d2492068e26b97ce17cf059965bbdb56.tar.gz
IB/mlx4: Increase maximal message size under UD QP
[ Upstream commit 5f22a1d87c5315a98981ecf93cd8de226cffe6ca ] 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: 6e0d733d9215 ("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> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/infiniband/hw/mlx4/qp.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c
index 33cbb7611d66..890bbf984748 100644
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -1465,7 +1465,7 @@ static int __mlx4_ib_modify_qp(struct ib_qp *ibqp,
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",