From ac7f97738c05e80f7de5e4ccbbf1ea82fdad956c Mon Sep 17 00:00:00 2001 From: Long Li Date: Mon, 17 Jul 2023 12:35:39 -0700 Subject: [PATCH 27/30] net: mana: Use the correct WQE count for ringing RQ doorbell 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. Reviewed-by: Haiyang Zhang Reviewed-by: Dexuan Cui Signed-off-by: Long Li Link: https://lore.kernel.org/r/1689622539-5334-3-git-send-email-longli@linuxonhyperv.com Signed-off-by: Jakub Kicinski (cherry picked from commit f5e39b57124fd4715d7f0e2f841b8609b38f3e40) Signed-off-by: Bastian Blank --- 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 97a1845c676a..6108a481edcb 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) -- 2.40.1