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Commit d9186098 authored by Sameeh Jubran's avatar Sameeh Jubran Committed by David S. Miller
Browse files

net: ena: optimise calculations for CQ doorbell 



This patch initially checks if CQ doorbell
is needed before proceeding with the calculations.

Signed-off-by: default avatarIgor Chauskin <igorch@amazon.com>
Signed-off-by: default avatarSameeh Jubran <sameehj@amazon.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent cdf449ec

drivers/net/ethernet/amazon/ena/ena_eth_com.h

+11 −9
Original line number Diff line number Diff line
@@ -195,16 +195,18 @@ static inline int ena_com_update_dev_comp_head(struct ena_com_io_cq *io_cq) 
	u16 unreported_comp, head;

	bool need_update;



	if (unlikely(io_cq->cq_head_db_reg)) {

		head = io_cq->head;

		unreported_comp = head - io_cq->last_head_update;

		need_update = unreported_comp > (io_cq->q_depth / ENA_COMP_HEAD_THRESH);



	if (io_cq->cq_head_db_reg && need_update) {

		if (unlikely(need_update)) {

			pr_debug("Write completion queue doorbell for queue %d: head: %d\n",

				 io_cq->qid, head);

			writel(head, io_cq->cq_head_db_reg);

			io_cq->last_head_update = head;

		}

	}



	return 0;

}