diff options
| author | Sameeh Jubran <sameehj@amazon.com> | 2019-06-03 17:43:27 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-06-03 23:30:38 +0300 |
| commit | d91860989dd4bce582ed6c3647a0d41d6fd895b3 (patch) | |
| tree | 972fb43e34ca4d5b5864d0467768bfa9fb78c832 | |
| parent | cdf449eccc5946d5dd4145b38347874a7423c50d (diff) | |
| download | linux-d91860989dd4bce582ed6c3647a0d41d6fd895b3.tar.xz | |
net: ena: optimise calculations for CQ doorbell
This patch initially checks if CQ doorbell
is needed before proceeding with the calculations.
Signed-off-by: Igor Chauskin <igorch@amazon.com>
Signed-off-by: Sameeh Jubran <sameehj@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/amazon/ena/ena_eth_com.h | 20 |
1 files changed, 11 insertions, 9 deletions
diff --git a/drivers/net/ethernet/amazon/ena/ena_eth_com.h b/drivers/net/ethernet/amazon/ena/ena_eth_com.h index 0a3d9180e40e..77986c0ea52c 100644 --- a/drivers/net/ethernet/amazon/ena/ena_eth_com.h +++ b/drivers/net/ethernet/amazon/ena/ena_eth_com.h @@ -195,15 +195,17 @@ static inline int ena_com_update_dev_comp_head(struct ena_com_io_cq *io_cq) u16 unreported_comp, head; bool need_update; - 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) { - 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; + 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 (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; |