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| author | Xuan Zhuo <xuanzhuo@linux.alibaba.com> | 2024-04-26 11:39:21 +0800 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2024-04-30 10:51:32 +0200 |
| commit | aff5b0e605b06e3d803fb198425753c8391ffb3d (patch) | |
| tree | 57cbf294576d5e2e83d51f8d61c0b950b0d18477 | |
| parent | dd1941f801bc958d2ee13f5be8b38db6b034b806 (diff) | |
| download | net-next-aff5b0e605b06e3d803fb198425753c8391ffb3d.tar.gz | |
virtio_net: introduce ability to get reply info from device
As the spec https://github.com/oasis-tcs/virtio-spec/commit/42f389989823039724f95bbbd243291ab0064f82
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>
| -rw-r--r-- | drivers/net/virtio_net.c | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c index 7176b956460bf7..3bc9b1e621dbb0 100644 --- a/drivers/net/virtio_net.c +++ b/drivers/net/virtio_net.c @@ -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); |