linux-kernel - [RFC PATCH 2/4] drivers/net/virtio_net: Changed mergeable buffer length calculation.

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Date:   Sun, 31 Oct 2021 06:59:57 +0200
From:   Andrew Melnychenko <andrew@...nix.com>
To:     mst@...hat.com, jasowang@...hat.com, davem@...emloft.net,
        kuba@...nel.org
Cc:     virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, yuri.benditovich@...nix.com,
        yan@...nix.com
Subject: [RFC PATCH 2/4] drivers/net/virtio_net: Changed mergeable buffer length calculation.

Now minimal virtual header length is may include the entire v1 header
if the hash report were populated.

Signed-off-by: Andrew Melnychenko <andrew@...nix.com>
---
 drivers/net/virtio_net.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index b72b21ac8ebd..abca2e93355d 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -393,7 +393,9 @@ static struct sk_buff *page_to_skb(struct virtnet_info *vi,
 	hdr_p = p;
 
 	hdr_len = vi->hdr_len;
-	if (vi->mergeable_rx_bufs)
+	if (vi->has_rss_hash_report)
+		hdr_padded_len = sizeof(struct virtio_net_hdr_v1_hash);
+	else if (vi->mergeable_rx_bufs)
 		hdr_padded_len = sizeof(*hdr);
 	else
 		hdr_padded_len = sizeof(struct padded_vnet_hdr);
@@ -1252,7 +1254,7 @@ static unsigned int get_mergeable_buf_len(struct receive_queue *rq,
 					  struct ewma_pkt_len *avg_pkt_len,
 					  unsigned int room)
 {
-	const size_t hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
+	const size_t hdr_len = ((struct virtnet_info *)(rq->vq->vdev->priv))->hdr_len;
 	unsigned int len;
 
 	if (room)
@@ -2817,7 +2819,7 @@ static void virtnet_del_vqs(struct virtnet_info *vi)
  */
 static unsigned int mergeable_min_buf_len(struct virtnet_info *vi, struct virtqueue *vq)
 {
-	const unsigned int hdr_len = sizeof(struct virtio_net_hdr_mrg_rxbuf);
+	const unsigned int hdr_len = vi->hdr_len;
 	unsigned int rq_size = virtqueue_get_vring_size(vq);
 	unsigned int packet_len = vi->big_packets ? IP_MAX_MTU : vi->dev->max_mtu;
 	unsigned int buf_len = hdr_len + ETH_HLEN + VLAN_HLEN + packet_len;
-- 
2.33.1