netdev - [PATCH v5 1/2] virtio-net: introduce and use helper function for guest gso support checks

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Date:   Thu, 1 Sep 2022 05:10:37 +0300
From:   Gavin Li <gavinl@...dia.com>
To:     <stephen@...workplumber.org>, <davem@...emloft.net>,
        <jesse.brandeburg@...el.com>, <alexander.h.duyck@...el.com>,
        <kuba@...nel.org>, <sridhar.samudrala@...el.com>,
        <jasowang@...hat.com>, <loseweigh@...il.com>,
        <netdev@...r.kernel.org>,
        <virtualization@...ts.linux-foundation.org>,
        <virtio-dev@...ts.oasis-open.org>, <mst@...hat.com>
CC:     <gavi@...dia.com>, <parav@...dia.com>,
        Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        Si-Wei Liu <si-wei.liu@...cle.com>
Subject: [PATCH v5 1/2] virtio-net: introduce and use helper function for guest gso support checks

Probe routine is already several hundred lines.
Use helper function for guest gso support check.

Signed-off-by: Gavin Li <gavinl@...dia.com>
Reviewed-by: Gavi Teitz <gavi@...dia.com>
Reviewed-by: Parav Pandit <parav@...dia.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
Reviewed-by: Si-Wei Liu <si-wei.liu@...cle.com>
---
changelog:
v4->v5
- Addressed comments from Michael S. Tsirkin
- Remove unnecessary () in return clause
v1->v2
- Add new patch
---
 drivers/net/virtio_net.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 9cce7dec7366..f831a0290998 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -3682,6 +3682,14 @@ static int virtnet_validate(struct virtio_device *vdev)
 	return 0;
 }
 
+static bool virtnet_check_guest_gso(const struct virtnet_info *vi)
+{
+	return virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO4) ||
+		virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_TSO6) ||
+		virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_ECN) ||
+		virtio_has_feature(vi->vdev, VIRTIO_NET_F_GUEST_UFO);
+}
+
 static int virtnet_probe(struct virtio_device *vdev)
 {
 	int i, err = -ENOMEM;
@@ -3777,10 +3785,7 @@ static int virtnet_probe(struct virtio_device *vdev)
 	spin_lock_init(&vi->refill_lock);
 
 	/* If we can receive ANY GSO packets, we must allocate large ones. */
-	if (virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO4) ||
-	    virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_TSO6) ||
-	    virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_ECN) ||
-	    virtio_has_feature(vdev, VIRTIO_NET_F_GUEST_UFO))
+	if (virtnet_check_guest_gso(vi))
 		vi->big_packets = true;
 
 	if (virtio_has_feature(vdev, VIRTIO_NET_F_MRG_RXBUF))
-- 
2.31.1