[PATCH v2 5/7] virtio: retrieve hdr_size from hw->vtnet_hdr_size
From: Yuanhan Liu <hidden>
Date: 2016-01-12 06:58:18
Subsystem:
networking drivers, the rest · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
The mergeable virtio net hdr format has been the standard and the only virtio net hdr format since virtio 1.0. Therefore, we could not hardcode hdr_size to "sizeof(struct virtio_net_hdr)" any more at virtio_recv_pkts(), otherwise, there would be a mismatch of hdr size from rte_vhost_enqueue_burst() and virtio_recv_pkts(), leading a packet corruption. Instead, we should retrieve it from hw->vtnet_hdr_size; we will do proper settings at eth_virtio_dev_init(). Signed-off-by: Yuanhan Liu <redacted> --- drivers/net/virtio/virtio_rxtx.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c
index b7267c0..41a1366 100644
--- a/drivers/net/virtio/virtio_rxtx.c
+++ b/drivers/net/virtio/virtio_rxtx.c@@ -560,7 +560,7 @@ virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) struct rte_mbuf *rcv_pkts[VIRTIO_MBUF_BURST_SZ]; int error; uint32_t i, nb_enqueued; - const uint32_t hdr_size = sizeof(struct virtio_net_hdr); + uint32_t hdr_size; nb_used = VIRTQUEUE_NUSED(rxvq);
@@ -580,6 +580,7 @@ virtio_recv_pkts(void *rx_queue, struct rte_mbuf **rx_pkts, uint16_t nb_pkts) hw = rxvq->hw; nb_rx = 0; nb_enqueued = 0; + hdr_size = hw->vtnet_hdr_size; for (i = 0; i < num ; i++) { rxm = rcv_pkts[i];
@@ -664,7 +665,7 @@ virtio_recv_mergeable_pkts(void *rx_queue, uint32_t seg_num; uint16_t extra_idx; uint32_t seg_res; - const uint32_t hdr_size = sizeof(struct virtio_net_hdr_mrg_rxbuf); + uint32_t hdr_size; nb_used = VIRTQUEUE_NUSED(rxvq);
@@ -682,6 +683,7 @@ virtio_recv_mergeable_pkts(void *rx_queue, seg_num = 0; extra_idx = 0; seg_res = 0; + hdr_size = hw->vtnet_hdr_size; while (i < nb_used) { struct virtio_net_hdr_mrg_rxbuf *header;
--
1.9.0