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Commit fd88d68b authored by Mike Rapoport's avatar Mike Rapoport Committed by David S. Miller
Browse files

macvtap: use common code for virtio_net_hdr and skb GSO conversion 



Replace open coded conversion between virtio_net_hdr to skb GSO info with
virtio_net_hdr_{from,to}_skb

Signed-off-by: default avatarMike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent fd2a0437

drivers/net/macvtap.c

+6 −89
Original line number Diff line number Diff line
@@ -627,93 +627,6 @@ static inline struct sk_buff *macvtap_alloc_skb(struct sock *sk, size_t prepad, 
	return skb;

}



/*

 * macvtap_skb_from_vnet_hdr and macvtap_skb_to_vnet_hdr should

 * be shared with the tun/tap driver.

 */

static int macvtap_skb_from_vnet_hdr(struct macvtap_queue *q,

				     struct sk_buff *skb,

				     struct virtio_net_hdr *vnet_hdr)

{

	unsigned short gso_type = 0;

	if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {

		switch (vnet_hdr->gso_type & ~VIRTIO_NET_HDR_GSO_ECN) {

		case VIRTIO_NET_HDR_GSO_TCPV4:

			gso_type = SKB_GSO_TCPV4;

			break;

		case VIRTIO_NET_HDR_GSO_TCPV6:

			gso_type = SKB_GSO_TCPV6;

			break;

		case VIRTIO_NET_HDR_GSO_UDP:

			gso_type = SKB_GSO_UDP;

			break;

		default:

			return -EINVAL;

		}



		if (vnet_hdr->gso_type & VIRTIO_NET_HDR_GSO_ECN)

			gso_type |= SKB_GSO_TCP_ECN;



		if (vnet_hdr->gso_size == 0)

			return -EINVAL;

	}



	if (vnet_hdr->flags & VIRTIO_NET_HDR_F_NEEDS_CSUM) {

		if (!skb_partial_csum_set(skb, macvtap16_to_cpu(q, vnet_hdr->csum_start),

					  macvtap16_to_cpu(q, vnet_hdr->csum_offset)))

			return -EINVAL;

	}



	if (vnet_hdr->gso_type != VIRTIO_NET_HDR_GSO_NONE) {

		skb_shinfo(skb)->gso_size = macvtap16_to_cpu(q, vnet_hdr->gso_size);

		skb_shinfo(skb)->gso_type = gso_type;



		/* Header must be checked, and gso_segs computed. */

		skb_shinfo(skb)->gso_type |= SKB_GSO_DODGY;

		skb_shinfo(skb)->gso_segs = 0;

	}

	return 0;

}



static void macvtap_skb_to_vnet_hdr(struct macvtap_queue *q,

				    const struct sk_buff *skb,

				    struct virtio_net_hdr *vnet_hdr)

{

	memset(vnet_hdr, 0, sizeof(*vnet_hdr));



	if (skb_is_gso(skb)) {

		struct skb_shared_info *sinfo = skb_shinfo(skb);



		/* This is a hint as to how much should be linear. */

		vnet_hdr->hdr_len = cpu_to_macvtap16(q, skb_headlen(skb));

		vnet_hdr->gso_size = cpu_to_macvtap16(q, sinfo->gso_size);

		if (sinfo->gso_type & SKB_GSO_TCPV4)

			vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV4;

		else if (sinfo->gso_type & SKB_GSO_TCPV6)

			vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_TCPV6;

		else if (sinfo->gso_type & SKB_GSO_UDP)

			vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_UDP;

		else

			BUG();

		if (sinfo->gso_type & SKB_GSO_TCP_ECN)

			vnet_hdr->gso_type |= VIRTIO_NET_HDR_GSO_ECN;

	} else

		vnet_hdr->gso_type = VIRTIO_NET_HDR_GSO_NONE;



	if (skb->ip_summed == CHECKSUM_PARTIAL) {

		vnet_hdr->flags = VIRTIO_NET_HDR_F_NEEDS_CSUM;

		if (skb_vlan_tag_present(skb))

			vnet_hdr->csum_start = cpu_to_macvtap16(q,

				skb_checksum_start_offset(skb) + VLAN_HLEN);

		else

			vnet_hdr->csum_start = cpu_to_macvtap16(q,

				skb_checksum_start_offset(skb));

		vnet_hdr->csum_offset = cpu_to_macvtap16(q, skb->csum_offset);

	} else if (skb->ip_summed == CHECKSUM_UNNECESSARY) {

		vnet_hdr->flags = VIRTIO_NET_HDR_F_DATA_VALID;

	} /* else everything is zero */

}



/* Neighbour code has some assumptions on HH_DATA_MOD alignment */

#define MACVTAP_RESERVE HH_DATA_OFF(ETH_HLEN)
@@ -812,7 +725,8 @@ static ssize_t macvtap_get_user(struct macvtap_queue *q, struct msghdr *m, 
	skb->protocol = eth_hdr(skb)->h_proto;



	if (vnet_hdr_len) {

		err = macvtap_skb_from_vnet_hdr(q, skb, &vnet_hdr);

		err = virtio_net_hdr_to_skb(skb, &vnet_hdr,

					    macvtap_is_little_endian(q));

		if (err)

			goto err_kfree;

	}
@@ -880,7 +794,10 @@ static ssize_t macvtap_put_user(struct macvtap_queue *q, 
		if (iov_iter_count(iter) < vnet_hdr_len)

			return -EINVAL;



		macvtap_skb_to_vnet_hdr(q, skb, &vnet_hdr);

		ret = virtio_net_hdr_from_skb(skb, &vnet_hdr,

					      macvtap_is_little_endian(q));

		if (ret)

			BUG();



		if (copy_to_iter(&vnet_hdr, sizeof(vnet_hdr), iter) !=

		    sizeof(vnet_hdr))