netdev - [PATCH v4 5/6] virtio_vdpa: Revert "virtio_vdpa: support the arg sizes of find

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Date:   Tue, 16 Aug 2022 01:36:45 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Xuan Zhuo <xuanzhuo@...ux.alibaba.com>,
        Jason Wang <jasowang@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Jens Axboe <axboe@...nel.dk>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Greg KH <gregkh@...uxfoundation.org>,
        Bo Liu <liubo03@...pur.com>
Subject: [PATCH v4 5/6] virtio_vdpa: Revert "virtio_vdpa: support the arg
 sizes of find_vqs()"

This reverts commit 99e8927d8a4da8eb8a8a5904dc13a3156be8e7c0:
proposed API isn't supported on all transports but no
effort was made to address this.

It might not be hard to fix if we want to: maybe just rename size to
size_hint and make sure legacy transports ignore the hint.

But it's not sure what the benefit is in any case, so let's drop it.

Fixes: 99e8927d8a4d ("virtio_vdpa: support the arg sizes of find_vqs()")
Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 drivers/virtio/virtio_vdpa.c | 15 ++++++---------
 1 file changed, 6 insertions(+), 9 deletions(-)

diff --git a/drivers/virtio/virtio_vdpa.c b/drivers/virtio/virtio_vdpa.c
index 9bc4d110b800..832d2c5b1b19 100644
--- a/drivers/virtio/virtio_vdpa.c
+++ b/drivers/virtio/virtio_vdpa.c
@@ -131,7 +131,7 @@ static irqreturn_t virtio_vdpa_virtqueue_cb(void *private)
 static struct virtqueue *
 virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
 		     void (*callback)(struct virtqueue *vq),
-		     const char *name, u32 size, bool ctx)
+		     const char *name, bool ctx)
 {
 	struct virtio_vdpa_device *vd_dev = to_virtio_vdpa_device(vdev);
 	struct vdpa_device *vdpa = vd_get_vdpa(vdev);
@@ -168,17 +168,14 @@ virtio_vdpa_setup_vq(struct virtio_device *vdev, unsigned int index,
 		goto error_new_virtqueue;
 	}
 
-	if (!size || size > max_num)
-		size = max_num;
-
 	if (ops->get_vq_num_min)
 		min_num = ops->get_vq_num_min(vdpa);
 
-	may_reduce_num = (size == min_num) ? false : true;
+	may_reduce_num = (max_num == min_num) ? false : true;
 
 	/* Create the vring */
 	align = ops->get_vq_align(vdpa);
-	vq = vring_create_virtqueue(index, size, align, vdev,
+	vq = vring_create_virtqueue(index, max_num, align, vdev,
 				    true, may_reduce_num, ctx,
 				    virtio_vdpa_notify, callback, name);
 	if (!vq) {
@@ -288,9 +285,9 @@ static int virtio_vdpa_find_vqs(struct virtio_device *vdev, unsigned int nvqs,
 			continue;
 		}
 
-		vqs[i] = virtio_vdpa_setup_vq(vdev, queue_idx++, callbacks[i],
-						  names[i], sizes ? sizes[i] : 0,
-						  ctx ? ctx[i] : false);
+		vqs[i] = virtio_vdpa_setup_vq(vdev, queue_idx++,
+					      callbacks[i], names[i], ctx ?
+					      ctx[i] : false);
 		if (IS_ERR(vqs[i])) {
 			err = PTR_ERR(vqs[i]);
 			goto err_setup_vq;
-- 
MST