[PATCH 3/3] net/axgbe: save segment data in scattered Rx

[Bhagyada Modali]

Save the segments of the packet, when the next descriptor data is not ready.

Fixes: 965b3127d425 ("net/axgbe: support scattered Rx")
Cc: sta...@dpdk.org

Signed-off-by: Bhagyada Modali <bhagyada.mod...@amd.com>
---
 drivers/net/axgbe/axgbe_rxtx.c | 11 +++++++++++
 drivers/net/axgbe/axgbe_rxtx.h |  6 ++++++
 2 files changed, 17 insertions(+)

diff --git a/drivers/net/axgbe/axgbe_rxtx.c b/drivers/net/axgbe/axgbe_rxtx.c
index c1f51ed6d6..65bda2a0d3 100644
--- a/drivers/net/axgbe/axgbe_rxtx.c
+++ b/drivers/net/axgbe/axgbe_rxtx.c
@@ -416,11 +416,17 @@ uint16_t eth_axgbe_recv_scattered_pkts(void *rx_queue,
                mbuf->data_len = data_len;
                mbuf->pkt_len = data_len;
 
+               if (rxq->saved_mbuf) {
+                       first_seg = rxq->saved_mbuf;
+                       rxq->saved_mbuf = NULL;
+               }
+
                if (first_seg != NULL) {
                        if (rte_pktmbuf_chain(first_seg, mbuf) != 0) {
                                rte_pktmbuf_free(first_seg);
                                first_seg = NULL;
                                rte_pktmbuf_free(mbuf);
+                               rxq->saved_mbuf = NULL;
                                rxq->errors++;
                                eop = 0;
                                break;
@@ -502,6 +508,11 @@ uint16_t eth_axgbe_recv_scattered_pkts(void *rx_queue,
                first_seg = NULL;
        }
 
+       /* Check if we need to save state before leaving */
+       if (first_seg != NULL && eop == 0)
+               rxq->saved_mbuf = first_seg;
+
+
        /* Save receive context.*/
        rxq->pkts += nb_rx;
 
diff --git a/drivers/net/axgbe/axgbe_rxtx.h b/drivers/net/axgbe/axgbe_rxtx.h
index 2a330339cd..2da3095547 100644
--- a/drivers/net/axgbe/axgbe_rxtx.h
+++ b/drivers/net/axgbe/axgbe_rxtx.h
@@ -65,6 +65,12 @@ struct axgbe_rx_queue {
        uint16_t crc_len;
        /* address of  s/w rx buffers */
        struct rte_mbuf **sw_ring;
+
+       /* For segemented packets - save the current state
+        * of packet, if next descriptor is not ready yet
+        */
+       struct rte_mbuf *saved_mbuf;
+
        /* Port private data */
        struct axgbe_port *pdata;
        /* Number of Rx descriptors in queue */
-- 
2.25.1