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virtio_net: disable premapped mode by default

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Now, the premapped mode encounters some problem.

    http://lore.kernel.org/all/8b20cc28-45a9-4643-8e87-ba164a540c0a@oracle.com

So we disable the premapped mode by default.
We can re-enable it in the future.

Fixes: f9dac92ba9 ("virtio_ring: enable premapped mode whatever use_dma_api")
Reported-by: "Si-Wei Liu" <si-wei.liu@oracle.com>
Closes: http://lore.kernel.org/all/8b20cc28-45a9-4643-8e87-ba164a540c0a@oracle.com
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Takero Funaki <flintglass@gmail.com>
Link: https://patch.msgid.link/20240906123137.108741-4-xuanzhuo@linux.alibaba.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Xuan Zhuo 2024-09-06 20:31:37 +08:00 committed by Jakub Kicinski
parent 38eef112a8
commit 111fc9f517
1 changed files with 0 additions and 18 deletions
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18
drivers/net/virtio_net.c
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@ -977,22 +977,6 @@ static void *virtnet_rq_alloc(struct receive_queue *rq, u32 size, gfp_t gfp)
return buf;
}
static void virtnet_rq_set_premapped(struct virtnet_info *vi)
{
int i;
/* disable for big mode */
if (!vi->mergeable_rx_bufs && vi->big_packets)
return;
for (i = 0; i < vi->max_queue_pairs; i++) {
if (virtqueue_set_dma_premapped(vi->rq[i].vq))
continue;
vi->rq[i].do_dma = true;
}
}
static void virtnet_rq_unmap_free_buf(struct virtqueue *vq, void *buf)
{
struct virtnet_info *vi = vq->vdev->priv;
@ -6105,8 +6089,6 @@ static int init_vqs(struct virtnet_info *vi)
if (ret)
goto err_free;
virtnet_rq_set_premapped(vi);
cpus_read_lock();
virtnet_set_affinity(vi);
cpus_read_unlock();