ixgbe: fix vector receive of chained mbuf

When the vector pmd was receiving a mix of packets of various sizes,
some of which were split across multiple mbufs, there was an issue
with reassembly of the jumbo frames. This was due to a skipped increment
when using "continue" in a while loop. Changing the loop to a "for"
loop fixes this problem, by ensuring the increment is always performed.

Reported-by: Prashant Upadhyaya <praupadhyaya@gmail.com>
Reported-by: Martin Weiser <martin.weiser@allegro-packets.com>
Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
Tested-by: Martin Weiser <martin.weiser@allegro-packets.com>

diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx_vec.c b/lib/librte_pmd_ixgbe/ixgbe_rxtx_vec.c
index b54cb19..dfaccee 100644 (file)
--- a/lib/librte_pmd_ixgbe/ixgbe_rxtx_vec.c
+++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx_vec.c
@@ -402,10 +402,10 @@ reassemble_packets(struct igb_rx_queue *rxq, struct rte_mbuf **rx_bufs,
        struct rte_mbuf *pkts[RTE_IXGBE_VPMD_RX_BURST]; /*finished pkts*/
        struct rte_mbuf *start = rxq->pkt_first_seg;
        struct rte_mbuf *end =  rxq->pkt_last_seg;
-       unsigned pkt_idx = 0, buf_idx = 0;
+       unsigned pkt_idx, buf_idx;
 
 
-       while (buf_idx < nb_bufs) {
+       for (buf_idx = 0, pkt_idx = 0; buf_idx < nb_bufs; buf_idx++) {
                if (end != NULL) {
                        /* processing a split packet */
                        end->next = rx_bufs[buf_idx];
@@ -448,7 +448,6 @@ reassemble_packets(struct igb_rx_queue *rxq, struct rte_mbuf **rx_bufs,
                        rx_bufs[buf_idx]->data_len += rxq->crc_len;
                        rx_bufs[buf_idx]->pkt_len += rxq->crc_len;
                }
-               buf_idx++;
        }
 
        /* save the partial packet for next time */