net/enic: refill only the address of the RQ descriptor

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>

diff --git a/drivers/net/enic/enic_rxtx.c b/drivers/net/enic/enic_rxtx.c
index a28834e..f27f3d4 100644 (file)
--- 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);