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Commit 192f68cf authored by Jason Wang's avatar Jason Wang Committed by David S. Miller
Browse files

virtio-net: switch to use new ctx API for small buffer 



Use ctx API to store headroom for small buffers.
Following patches will retrieve this info and use it for XDP.

Signed-off-by: default avatarJason Wang <jasowang@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 28b39bc7

drivers/net/virtio_net.c

+12 −5
Original line number Diff line number Diff line
@@ -410,7 +410,8 @@ static unsigned int virtnet_get_headroom(struct virtnet_info *vi) 
static struct sk_buff *receive_small(struct net_device *dev,

				     struct virtnet_info *vi,

				     struct receive_queue *rq,

				     void *buf, unsigned int len)

				     void *buf, void *ctx,

				     unsigned int len)

{

	struct sk_buff *skb;

	struct bpf_prog *xdp_prog;
@@ -773,7 +774,7 @@ static int receive_buf(struct virtnet_info *vi, struct receive_queue *rq, 
	else if (vi->big_packets)

		skb = receive_big(dev, vi, rq, buf, len);

	else

		skb = receive_small(dev, vi, rq, buf, len);

		skb = receive_small(dev, vi, rq, buf, ctx, len);



	if (unlikely(!skb))

		return 0;
@@ -806,12 +807,18 @@ static int receive_buf(struct virtnet_info *vi, struct receive_queue *rq, 
	return 0;

}



/* Unlike mergeable buffers, all buffers are allocated to the

 * same size, except for the headroom. For this reason we do

 * not need to use  mergeable_len_to_ctx here - it is enough

 * to store the headroom as the context ignoring the truesize.

 */

static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq,

			     gfp_t gfp)

{

	struct page_frag *alloc_frag = &rq->alloc_frag;

	char *buf;

	unsigned int xdp_headroom = virtnet_get_headroom(vi);

	void *ctx = (void *)(unsigned long)xdp_headroom;

	int len = vi->hdr_len + VIRTNET_RX_PAD + GOOD_PACKET_LEN + xdp_headroom;

	int err;
@@ -825,7 +832,7 @@ static int add_recvbuf_small(struct virtnet_info *vi, struct receive_queue *rq, 
	alloc_frag->offset += len;

	sg_init_one(rq->sg, buf + VIRTNET_RX_PAD + xdp_headroom,

		    vi->hdr_len + GOOD_PACKET_LEN);

	err = virtqueue_add_inbuf(rq->vq, rq->sg, 1, buf, gfp);

	err = virtqueue_add_inbuf_ctx(rq->vq, rq->sg, 1, buf, ctx, gfp);

	if (err < 0)

		put_page(virt_to_head_page(buf));
@@ -1034,7 +1041,7 @@ static int virtnet_receive(struct receive_queue *rq, int budget) 
	void *buf;

	struct virtnet_stats *stats = this_cpu_ptr(vi->stats);



	if (vi->mergeable_rx_bufs) {

	if (!vi->big_packets || vi->mergeable_rx_bufs) {

		void *ctx;



		while (received < budget &&
@@ -2202,7 +2209,7 @@ 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) {

	if (!vi->big_packets || vi->mergeable_rx_bufs) {

		ctx = kzalloc(total_vqs * sizeof(*ctx), GFP_KERNEL);

		if (!ctx)

			goto err_ctx;