[dpdk-dev] [memnic PATCH 5/5] pmd: handle multiple segments on xmit

[Hiroshi Shimamoto]

From: Hiroshi Shimamoto <h-shimam...@ct.jp.nec.com>

The current MEMNIC PMD cannot handle multiple segments.

Add the functionality to transmit a mbuf which has multiple segments.
Walk every segment in transmitting mbuf and copy the data to MEMNIC
packet buffer.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto at ct.jp.nec.com>
Reviewed-by: Hayato Momma <h-momma at ce.jp.nec.com>
---
 pmd/pmd_memnic.c | 19 ++++++++++++++-----
 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/pmd/pmd_memnic.c b/pmd/pmd_memnic.c
index abfd437..4ee655d 100644
--- a/pmd/pmd_memnic.c
+++ b/pmd/pmd_memnic.c
@@ -324,9 +324,11 @@ static uint16_t memnic_xmit_pkts(void *tx_queue,
        pkts = bytes = errs = 0;

        for (nr = 0; nr < nb_pkts; nr++) {
-               int len = rte_pktmbuf_data_len(tx_pkts[nr]);
+               int pkt_len = rte_pktmbuf_pkt_len(tx_pkts[nr]);
+               struct rte_mbuf *sg;
+               void *ptr;

-               if (len > MEMNIC_MAX_FRAME_LEN) {
+               if (pkt_len > MEMNIC_MAX_FRAME_LEN) {
                        errs++;
                        break;
                }
@@ -356,12 +358,19 @@ retry:
                        idx = 0;
                adapter->down_idx = idx;

-               p->len = len;
+               p->len = pkt_len;

-               rte_memcpy(p->data, rte_pktmbuf_mtod(tx_pkts[nr], void *), len);
+               ptr = p->data;
+               for (sg = tx_pkts[nr]; sg; sg = sg->pkt.next) {
+                       void *src = rte_pktmbuf_mtod(sg, void *);
+                       int data_len = sg->pkt.data_len;
+
+                       rte_memcpy(ptr, src, data_len);
+                       ptr += data_len;
+               }

                pkts++;
-               bytes += len;
+               bytes += pkt_len;

                rte_mb();
                p->status = MEMNIC_PKT_ST_FILLED;
-- 
1.8.4