From: Long Li longli@microsoft.com

The hardware specification specifies that WQE_COUNT should set to 0 for the Receive Queue. Although currently the hardware doesn't enforce the check, in the future releases it may check on this value.

Cc: stable@vger.kernel.org Fixes: ca9c54d2d6a5 ("net: mana: Add a driver for Microsoft Azure Network Adapter (MANA)") Reviewed-by: Haiyang Zhang haiyangz@microsoft.com Reviewed-by: Dexuan Cui decui@microsoft.com Signed-off-by: Long Li longli@microsoft.com --- Change log: v4: Split the original patch into two: one for batching doorbell, one for setting the correct wqe count

drivers/net/ethernet/microsoft/mana/gdma_main.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c index 8f3f78b68592..3765d3389a9a 100644 --- a/drivers/net/ethernet/microsoft/mana/gdma_main.c +++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c @@ -300,8 +300,11 @@ static void mana_gd_ring_doorbell(struct gdma_context *gc, u32 db_index,

void mana_gd_wq_ring_doorbell(struct gdma_context *gc, struct gdma_queue *queue) { + /* Hardware Spec specifies that software client should set 0 for + * wqe_cnt for Receive Queues. This value is not used in Send Queues. + */ mana_gd_ring_doorbell(gc, queue->gdma_dev->doorbell, queue->type, - queue->id, queue->head * GDMA_WQE_BU_SIZE, 1); + queue->id, queue->head * GDMA_WQE_BU_SIZE, 0); }

void mana_gd_ring_cq(struct gdma_queue *cq, u8 arm_bit)