From 6e0d733d921526e628107fb8b1aff5f7de870d6f Mon Sep 17 00:00:00 2001 From: Alex Naslednikov Date: Thu, 7 Aug 2008 14:06:50 -0700 Subject: [PATCH] IB/mlx4: Allow 4K messages for UD QPs Current code limits the max message size to 2K for UD QPs, while MTU might be as big as 4K. This patch sets the maximum message size to 4K, which is needed for UD to work correctly on fabrics with a 4K MTU. Signed-off-by: Alex Naslednikov Signed-off-by: Eli Cohen Signed-off-by: Roland Dreier --- drivers/infiniband/hw/mlx4/qp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c index f7bc7dd857..f29dbb767e 100644 --- a/drivers/infiniband/hw/mlx4/qp.c +++ b/drivers/infiniband/hw/mlx4/qp.c @@ -902,7 +902,7 @@ 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) | 11; + context->mtu_msgmax = (IB_MTU_4096 << 5) | 12; } else if (attr_mask & IB_QP_PATH_MTU) { if (attr->path_mtu < IB_MTU_256 || attr->path_mtu > IB_MTU_4096) { printk(KERN_ERR "path MTU (%u) is invalid\n", -- 2.39.5