From: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Date: Tue, 2 Feb 2016 13:48:17 +0000 (+0800)
Subject: virtio: retrieve header size from device setting
X-Git-Tag: spdx-start~7659
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=1905e101dc4aabff6e0cd4dc58ed095d3f0a5c26;p=dpdk.git

virtio: retrieve header size from device setting

The mergeable virtio net hdr format has been the standard and the
only virtio net hdr format since virtio 1.0. Therefore, we can
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() in later patches.

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Tested-by: Qian Xu <qian.q.xu@intel.com>
Reviewed-by: Tetsuya Mukawa <mukawa@igel.co.jp>
Tested-by: Tetsuya Mukawa <mukawa@igel.co.jp>
Acked-by: Huawei Xie <huawei.xie@intel.com>
---

diff --git a/drivers/net/virtio/virtio_rxtx.c b/drivers/net/virtio/virtio_rxtx.c
index b7267c003c..41a1366882 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;
diff --git a/drivers/net/virtio/virtio_rxtx_simple.c b/drivers/net/virtio/virtio_rxtx_simple.c
index ff3c11a426..3a1de9d282 100644
--- a/drivers/net/virtio/virtio_rxtx_simple.c
+++ b/drivers/net/virtio/virtio_rxtx_simple.c
@@ -81,9 +81,9 @@ virtqueue_enqueue_recv_refill_simple(struct virtqueue *vq,
 
 	start_dp = vq->vq_ring.desc;
 	start_dp[desc_idx].addr = (uint64_t)((uintptr_t)cookie->buf_physaddr +
-		RTE_PKTMBUF_HEADROOM - sizeof(struct virtio_net_hdr));
+		RTE_PKTMBUF_HEADROOM - vq->hw->vtnet_hdr_size);
 	start_dp[desc_idx].len = cookie->buf_len -
-		RTE_PKTMBUF_HEADROOM + sizeof(struct virtio_net_hdr);
+		RTE_PKTMBUF_HEADROOM + vq->hw->vtnet_hdr_size;
 
 	vq->vq_free_cnt--;
 	vq->vq_avail_idx++;
@@ -120,9 +120,9 @@ virtio_rxq_rearm_vec(struct virtqueue *rxvq)
 
 		start_dp[i].addr =
 			(uint64_t)((uintptr_t)sw_ring[i]->buf_physaddr +
-			RTE_PKTMBUF_HEADROOM - sizeof(struct virtio_net_hdr));
+			RTE_PKTMBUF_HEADROOM - rxvq->hw->vtnet_hdr_size);
 		start_dp[i].len = sw_ring[i]->buf_len -
-			RTE_PKTMBUF_HEADROOM + sizeof(struct virtio_net_hdr);
+			RTE_PKTMBUF_HEADROOM + rxvq->hw->vtnet_hdr_size;
 	}
 
 	rxvq->vq_avail_idx += RTE_VIRTIO_VPMD_RX_REARM_THRESH;
@@ -175,8 +175,8 @@ virtio_recv_pkts_vec(void *rx_queue, struct rte_mbuf **rx_pkts,
 	len_adjust = _mm_set_epi16(
 		0, 0,
 		0,
-		(uint16_t) -sizeof(struct virtio_net_hdr),
-		0, (uint16_t) -sizeof(struct virtio_net_hdr),
+		(uint16_t)-rxvq->hw->vtnet_hdr_size,
+		0, (uint16_t)-rxvq->hw->vtnet_hdr_size,
 		0, 0);
 
 	if (unlikely(nb_pkts < RTE_VIRTIO_DESC_PER_LOOP))