[dpdk-dev] [PATCH 08/20] net/ena: call additional doorbells if needed

Michal Krawczyk mk at semihalf.com
Fri Dec 14 14:18:34 CET 2018


From: Rafal Kozik <rk at semihalf.com>

Before sending next packet, check if calling doorbell is needed.

Signed-off-by: Rafal Kozik <rk at semihalf.com>
Acked-by: Michal Krawczyk <mk at semihalf.com>
---
 drivers/net/ena/ena_ethdev.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ena/ena_ethdev.c b/drivers/net/ena/ena_ethdev.c
index f83552377..5f7dec086 100644
--- a/drivers/net/ena/ena_ethdev.c
+++ b/drivers/net/ena/ena_ethdev.c
@@ -2363,7 +2363,16 @@ static uint16_t eth_ena_xmit_pkts(void *tx_queue, struct rte_mbuf **tx_pkts,
 
 		ena_tx_ctx.num_bufs = tx_info->num_of_bufs;
 
-		/* Write data to device */
+		if (ena_com_is_doorbell_needed(tx_ring->ena_com_io_sq,
+					       &ena_tx_ctx)) {
+			RTE_LOG(DEBUG, PMD, "llq tx max burst size of queue %d"
+				" achieved, writing doorbell to send burst\n",
+				tx_ring->id);
+			rte_wmb();
+			ena_com_write_sq_doorbell(tx_ring->ena_com_io_sq);
+		}
+
+		/* prepare the packet's descriptors to dma engine */
 		rc = ena_com_prepare_tx(tx_ring->ena_com_io_sq,
 					&ena_tx_ctx, &nb_hw_desc);
 		if (unlikely(rc))
-- 
2.14.1



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