[PATCH v3 net-next 1/3] ionic: use fewer firmware doorbells on rx fill
From: Shannon Nelson <hidden>
Date: 2020-07-31 20:15:47
Subsystem:
networking drivers, pensando ethernet drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Brett Creeley, Linus Torvalds
We really don't need to hit the Rx queue doorbell so many times, we can wait to the end and cause a little less thrash. Signed-off-by: Shannon Nelson <redacted> --- drivers/net/ethernet/pensando/ionic/ionic_txrx.c | 15 +++++---------- 1 file changed, 5 insertions(+), 10 deletions(-)
diff --git a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
index 85eb8f276a37..e660cd66f9a8 100644
--- a/drivers/net/ethernet/pensando/ionic/ionic_txrx.c
+++ b/drivers/net/ethernet/pensando/ionic/ionic_txrx.c@@ -331,9 +331,6 @@ static void ionic_rx_page_free(struct ionic_queue *q, struct page *page, __free_page(page); } -#define IONIC_RX_RING_DOORBELL_STRIDE ((1 << 5) - 1) -#define IONIC_RX_RING_HEAD_BUF_SZ 2048 - void ionic_rx_fill(struct ionic_queue *q) { struct net_device *netdev = q->lif->netdev;
@@ -345,7 +342,6 @@ void ionic_rx_fill(struct ionic_queue *q) unsigned int remain_len; unsigned int seg_len; unsigned int nfrags; - bool ring_doorbell; unsigned int i, j; unsigned int len;
@@ -360,9 +356,7 @@ void ionic_rx_fill(struct ionic_queue *q) page_info = &desc_info->pages[0]; if (page_info->page) { /* recycle the buffer */ - ring_doorbell = ((q->head->index + 1) & - IONIC_RX_RING_DOORBELL_STRIDE) == 0; - ionic_rxq_post(q, ring_doorbell, ionic_rx_clean, NULL); + ionic_rxq_post(q, false, ionic_rx_clean, NULL); continue; }
@@ -401,10 +395,11 @@ void ionic_rx_fill(struct ionic_queue *q) page_info++; } - ring_doorbell = ((q->head->index + 1) & - IONIC_RX_RING_DOORBELL_STRIDE) == 0; - ionic_rxq_post(q, ring_doorbell, ionic_rx_clean, NULL); + ionic_rxq_post(q, false, ionic_rx_clean, NULL); } + + ionic_dbell_ring(q->lif->kern_dbpage, q->hw_type, + q->dbval | q->head->index); } static void ionic_rx_fill_cb(void *arg)
--
2.17.1