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virtio_net: introduce ability to get reply info from device

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As the spec 42f3899898

Based on the description provided in the above specification, we have
enabled the virtio-net driver to support acquiring some response
information from the device via the CVQ (Control Virtqueue).

Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Xuan Zhuo 2024-04-26 11:39:21 +08:00 committed by Paolo Abeni
parent dd1941f801
commit aff5b0e605
1 changed files with 17 additions and 7 deletions
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24
drivers/net/virtio_net.c
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@ -2527,11 +2527,12 @@ static int virtnet_tx_resize(struct virtnet_info *vi,
* supported by the hypervisor, as indicated by feature bits, should
* never fail unless improperly formatted.
*/
static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
struct scatterlist *out)
static bool virtnet_send_command_reply(struct virtnet_info *vi, u8 class, u8 cmd,
struct scatterlist *out,
struct scatterlist *in)
{
struct scatterlist *sgs[4], hdr, stat;
unsigned out_num = 0, tmp;
struct scatterlist *sgs[5], hdr, stat;
u32 out_num = 0, tmp, in_num = 0;
int ret;
/* Caller should know better */
@ -2549,10 +2550,13 @@ static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
/* Add return status. */
sg_init_one(&stat, &vi->ctrl->status, sizeof(vi->ctrl->status));
sgs[out_num] = &stat;
sgs[out_num + in_num++] = &stat;
BUG_ON(out_num + 1 > ARRAY_SIZE(sgs));
ret = virtqueue_add_sgs(vi->cvq, sgs, out_num, 1, vi, GFP_ATOMIC);
if (in)
sgs[out_num + in_num++] = in;
BUG_ON(out_num + in_num > ARRAY_SIZE(sgs));
ret = virtqueue_add_sgs(vi->cvq, sgs, out_num, in_num, vi, GFP_ATOMIC);
if (ret < 0) {
dev_warn(&vi->vdev->dev,
"Failed to add sgs for command vq: %d\n.", ret);
@ -2574,6 +2578,12 @@ static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
return vi->ctrl->status == VIRTIO_NET_OK;
}
static bool virtnet_send_command(struct virtnet_info *vi, u8 class, u8 cmd,
struct scatterlist *out)
{
return virtnet_send_command_reply(vi, class, cmd, out, NULL);
}
static int virtnet_set_mac_address(struct net_device *dev, void *p)
{
struct virtnet_info *vi = netdev_priv(dev);