diff options
Diffstat (limited to 'debian/patches/features/all/ena/net-ena-optimise-calculations-for-CQ-doorbell.patch')
| -rw-r--r-- | debian/patches/features/all/ena/net-ena-optimise-calculations-for-CQ-doorbell.patch | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/debian/patches/features/all/ena/net-ena-optimise-calculations-for-CQ-doorbell.patch b/debian/patches/features/all/ena/net-ena-optimise-calculations-for-CQ-doorbell.patch new file mode 100644 index 000000000..c790eae13 --- /dev/null +++ b/debian/patches/features/all/ena/net-ena-optimise-calculations-for-CQ-doorbell.patch @@ -0,0 +1,50 @@ +From: Sameeh Jubran <sameehj@amazon.com> +Date: Mon, 3 Jun 2019 17:43:27 +0300 +Subject: [PATCH] net: ena: optimise calculations for CQ doorbell +Origin: https://git.kernel.org/linus/d91860989dd4bce582ed6c3647a0d41d6fd895b3 +Bug-Debian: https://bugs.debian.org/941291 + +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> +--- + drivers/net/ethernet/amazon/ena/ena_eth_com.h | 20 ++++++++++--------- + 1 file 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; +-- +2.17.1 + |