net/enic: enable RQ first and then post Rx buffers

[dpdk.git] / drivers / net / enic / enic_main.c

diff --git a/drivers/net/enic/enic_main.c b/drivers/net/enic/enic_main.c
index 2a22697..e2adadc 100644 (file)
--- a/drivers/net/enic/enic_main.c
+++ b/drivers/net/enic/enic_main.c
@@ -315,6 +315,24 @@ enic_alloc_rx_queue_mbufs(struct enic *enic, struct vnic_rq *rq)
                                rq_buf_len);
                rq->mbuf_ring[i] = mb;
        }
+       /*
+        * Do not post the buffers to the NIC until we enable the RQ via
+        * enic_start_rq().
+        */
+       rq->need_initial_post = true;
+       return 0;
+}
+
+/*
+ * Post the Rx buffers for the first time. enic_alloc_rx_queue_mbufs() has
+ * allocated the buffers and filled the RQ descriptor ring. Just need to push
+ * the post index to the NIC.
+ */
+static void
+enic_initial_post_rx(struct enic *enic, struct vnic_rq *rq)
+{
+       if (!rq->in_use || !rq->need_initial_post)
+               return;
 
        /* make sure all prior writes are complete before doing the PIO write */
        rte_rmb();
@@ -329,9 +347,7 @@ enic_alloc_rx_queue_mbufs(struct enic *enic, struct vnic_rq *rq)
        iowrite32(rq->posted_index, &rq->ctrl->posted_index);
        iowrite32(0, &rq->ctrl->fetch_index);
        rte_rmb();
-
-       return 0;
-
+       rq->need_initial_post = false;
 }
 
 static void *
@@ -619,10 +635,13 @@ void enic_start_rq(struct enic *enic, uint16_t queue_idx)
        rq_data = &enic->rq[rq_sop->data_queue_idx];
        struct rte_eth_dev *eth_dev = enic->rte_dev;
 
-       if (rq_data->in_use)
+       if (rq_data->in_use) {
                vnic_rq_enable(rq_data);
+               enic_initial_post_rx(enic, rq_data);
+       }
        rte_mb();
        vnic_rq_enable(rq_sop);
+       enic_initial_post_rx(enic, rq_sop);
        eth_dev->data->rx_queue_state[queue_idx] = RTE_ETH_QUEUE_STATE_STARTED;
 }