This is a note to let you know that I've just added the patch titled

IB/mlx4: Fix RSS's QPC attributes assignments

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: ib-mlx4-fix-rss-s-qpc-attributes-assignments.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Mon Dec 18 13:28:59 CET 2017

From: Guy Levi guyle@mellanox.com Date: Wed, 25 Oct 2017 22:39:35 +0300 Subject: IB/mlx4: Fix RSS's QPC attributes assignments

From: Guy Levi guyle@mellanox.com

[ Upstream commit 108809a0571cd1e1b317c5c083a371e163e1f8f9 ]

In the modify QP handler the base_qpn_udp field in the RSS QPC is overwrite later by irrelevant value assignment. Hence, ingress packets which gets to the RSS QP will be steered then to a garbage QPN.

The patch fixes this by skipping the above assignment when a RSS QP is modified, also, the RSS context's attributes assignments are relocated just before the context is posted to avoid future issues like this.

Additionally, this patch takes the opportunity to change the code to be disciplined to the device's manual and assigns the RSS QP context just at RESET to INIT transition.

Fixes:3078f5f1bd8b ("IB/mlx4: Add support for RSS QP") Signed-off-by: Guy Levi guyle@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 Signed-off-by: Sasha Levin alexander.levin@verizon.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/infiniband/hw/mlx4/qp.c | 16 +++++++++------- 1 file changed, 9 insertions(+), 7 deletions(-)

--- a/drivers/infiniband/hw/mlx4/qp.c +++ b/drivers/infiniband/hw/mlx4/qp.c @@ -2182,11 +2182,6 @@ static int __mlx4_ib_modify_qp(void *src context->flags = cpu_to_be32((to_mlx4_state(new_state) << 28) | (to_mlx4_st(dev, qp->mlx4_ib_qp_type) << 16));

- if (rwq_ind_tbl) { - fill_qp_rss_context(context, qp); - context->flags |= cpu_to_be32(1 << MLX4_RSS_QPC_FLAG_OFFSET); - } - if (!(attr_mask & IB_QP_PATH_MIG_STATE)) context->flags |= cpu_to_be32(MLX4_QP_PM_MIGRATED << 11); else { @@ -2387,6 +2382,7 @@ static int __mlx4_ib_modify_qp(void *src context->pd = cpu_to_be32(pd->pdn);

if (!rwq_ind_tbl) { + context->params1 = cpu_to_be32(MLX4_IB_ACK_REQ_FREQ << 28); get_cqs(qp, src_type, &send_cq, &recv_cq); } else { /* Set dummy CQs to be compatible with HV and PRM */ send_cq = to_mcq(rwq_ind_tbl->ind_tbl[0]->cq); @@ -2394,7 +2390,6 @@ static int __mlx4_ib_modify_qp(void *src } context->cqn_send = cpu_to_be32(send_cq->mcq.cqn); context->cqn_recv = cpu_to_be32(recv_cq->mcq.cqn); - context->params1 = cpu_to_be32(MLX4_IB_ACK_REQ_FREQ << 28);

/* Set "fast registration enabled" for all kernel QPs */ if (!ibuobject) @@ -2513,7 +2508,7 @@ static int __mlx4_ib_modify_qp(void *src MLX4_IB_LINK_TYPE_ETH; if (dev->dev->caps.tunnel_offload_mode == MLX4_TUNNEL_OFFLOAD_MODE_VXLAN) { /* set QP to receive both tunneled & non-tunneled packets */ - if (!(context->flags & cpu_to_be32(1 << MLX4_RSS_QPC_FLAG_OFFSET))) + if (!rwq_ind_tbl) context->srqn = cpu_to_be32(7 << 28); } } @@ -2562,6 +2557,13 @@ static int __mlx4_ib_modify_qp(void *src } }

+ if (rwq_ind_tbl && + cur_state == IB_QPS_RESET && + new_state == IB_QPS_INIT) { + fill_qp_rss_context(context, qp); + context->flags |= cpu_to_be32(1 << MLX4_RSS_QPC_FLAG_OFFSET); + } + err = mlx4_qp_modify(dev->dev, &qp->mtt, to_mlx4_state(cur_state), to_mlx4_state(new_state), context, optpar, sqd_event, &qp->mqp);

Patches currently in stable-queue which might be from guyle@mellanox.com are

queue-4.14/ib-mlx4-fix-rss-s-qpc-attributes-assignments.patch