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Subject[PATCH 4/6] virtio_net: allow specifying context for rx
With mergeable buffers we never use s/g for rx,
so allow specifying context in that case.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
drivers/net/virtio_net.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
index 6802169..340f737 100644
--- a/drivers/net/virtio_net.c
+++ b/drivers/net/virtio_net.c
@@ -2044,6 +2044,7 @@ static int virtnet_find_vqs(struct virtnet_info *vi)
int ret = -ENOMEM;
int i, total_vqs;
const char **names;
+ const bool *ctx;

/* We expect 1 RX virtqueue followed by 1 TX virtqueue, followed by
* possible N-1 RX/TX queue pairs used in multiqueue mode, followed by
@@ -2062,6 +2063,13 @@ static int virtnet_find_vqs(struct virtnet_info *vi)
names = kmalloc(total_vqs * sizeof(*names), GFP_KERNEL);
if (!names)
goto err_names;
+ if (vi->mergeable_rx_bufs) {
+ ctx = kzalloc(total_vqs * sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ goto err_ctx;
+ } else {
+ ctx = NULL;
+ }

/* Parameters for control virtqueue, if any */
if (vi->has_cvq) {
@@ -2077,9 +2085,12 @@ static int virtnet_find_vqs(struct virtnet_info *vi)
sprintf(vi->sq[i].name, "output.%d", i);
names[rxq2vq(i)] = vi->rq[i].name;
names[txq2vq(i)] = vi->sq[i].name;
+ if (ctx)
+ ctx[rxq2vq(i)] = true;
}

- ret = virtio_find_vqs(vi->vdev, total_vqs, vqs, callbacks, names, NULL);
+ ret = vi->vdev->config->find_vqs(vi->vdev, total_vqs, vqs, callbacks,
+ names, ctx, NULL);
if (ret)
goto err_find;

@@ -2101,6 +2112,8 @@ static int virtnet_find_vqs(struct virtnet_info *vi)
return 0;

err_find:
+ kfree(ctx);
+err_ctx:
kfree(names);
err_names:
kfree(callbacks);
--
MST
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