[dpdk-dev] [PATCH] net/netvsc: fix seg fault during transmit

[Chas Williams]

Commit cc0251813277 ("net/netvsc: split send buffers from Tx
descriptors") changed the way that transmit descriptors are
allocated. They come from a single pool instead of being
individually attached to each mbuf. To find the IOVA, you need
to calculate the offset from the base of the pool.

Fixes: cc0251813277 ("net/netvsc: split send buffers from Tx descriptors")
Cc: stable at dpdk.org

Signed-off-by: Chas Williams <3chas3 at gmail.com>
---
 drivers/net/netvsc/hn_rxtx.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/netvsc/hn_rxtx.c b/drivers/net/netvsc/hn_rxtx.c
index 86a4c0d74..0428c586a 100644
--- a/drivers/net/netvsc/hn_rxtx.c
+++ b/drivers/net/netvsc/hn_rxtx.c
@@ -1421,11 +1421,12 @@ static int hn_xmit_sg(struct hn_tx_queue *txq,
 	hn_rndis_dump(txd->rndis_pkt);
 
 	/* pass IOVA of rndis header in first segment */
-	addr = rte_malloc_virt2iova(txd->rndis_pkt);
+	addr = rte_malloc_virt2iova(txq->tx_rndis);
 	if (unlikely(addr == RTE_BAD_IOVA)) {
 		PMD_DRV_LOG(ERR, "RNDIS transmit can not get iova");
 		return -EINVAL;
 	}
+	addr = addr + ((char *)txd->rndis_pkt - (char *)txq->tx_rndis);
 
 	sg[0].page = addr / PAGE_SIZE;
 	sg[0].ofs = addr & PAGE_MASK;
-- 
2.21.3