[dpdk-dev] [PATCH] net/enic: refill only the address of the RQ descriptor

[John Daley <johndale@cisco.com>]

From: Hyong Youb Kim <hyonkim@cisco.com>

Once the RQ descriptors are initialized (enic_alloc_rx_queue_mbufs),
their length_type does not change during normal RX
operations. rx_pkt_burst only needs to reset their address field for
newly allocated mbufs.

Signed-off-by: Hyong Youb Kim <hyonkim@cisco.com>
Reviewed-by: John Daley <johndale@cisco.com>
---
 drivers/net/enic/enic_rxtx.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

diff --git a/drivers/net/enic/enic_rxtx.c b/drivers/net/enic/enic_rxtx.c
index a28834ea7..f27f3d443 100644
--- a/drivers/net/enic/enic_rxtx.c
+++ b/drivers/net/enic/enic_rxtx.c
@@ -327,7 +327,6 @@ enic_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 
 	while (nb_rx < nb_pkts) {
 		volatile struct rq_enet_desc *rqd_ptr;
-		dma_addr_t dma_addr;
 		struct cq_desc cqd;
 		uint8_t packet_error;
 		uint16_t ciflags;
@@ -376,12 +375,13 @@ enic_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts,
 
 		/* Push descriptor for newly allocated mbuf */
 		nmb->data_off = RTE_PKTMBUF_HEADROOM;
-		dma_addr = (dma_addr_t)(nmb->buf_iova +
-					RTE_PKTMBUF_HEADROOM);
-		rq_enet_desc_enc(rqd_ptr, dma_addr,
-				(rq->is_sop ? RQ_ENET_TYPE_ONLY_SOP
-				: RQ_ENET_TYPE_NOT_SOP),
-				nmb->buf_len - RTE_PKTMBUF_HEADROOM);
+		/*
+		 * Only the address needs to be refilled. length_type of the
+		 * descriptor it set during initialization
+		 * (enic_alloc_rx_queue_mbufs) and does not change.
+		 */
+		rqd_ptr->address = rte_cpu_to_le_64(nmb->buf_iova +
+						    RTE_PKTMBUF_HEADROOM);
 
 		/* Fill in the rest of the mbuf */
 		seg_length = enic_cq_rx_desc_n_bytes(&cqd);
-- 
2.12.0