[PATCH 4/6] virtio_net: allow specifying context for rx

[Michael S. Tsirkin]

With mergeable buffers we never use s/g for rx,
so allow specifying context in that case.

Signed-off-by: Michael S. Tsirkin <m...@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