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Commit 493c6be3 authored by Sridhar Samudrala's avatar Sridhar Samudrala Committed by David S. Miller
Browse files

udpv6: Fix HW checksum support for outgoing UFO packets 



- add HW checksum support for outgoing large UDP/IPv6 packets destined for
  a UFO enabled device.

Signed-off-by: default avatarSridhar Samudrala <sri@us.ibm.com>
Acked-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent d7ca4cc0

net/ipv6/udp.c

+47 −1
Original line number Diff line number Diff line
@@ -638,6 +638,47 @@ static void udp_v6_flush_pending_frames(struct sock *sk) 
	}

}



/**

 * 	udp6_hwcsum_outgoing  -  handle outgoing HW checksumming

 * 	@sk: 	socket we are sending on

 * 	@skb: 	sk_buff containing the filled-in UDP header

 * 	        (checksum field must be zeroed out)

 */

static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,

				 const struct in6_addr *saddr,

				 const struct in6_addr *daddr, int len)

{

	unsigned int offset;

	struct udphdr *uh = udp_hdr(skb);

	__wsum csum = 0;



	if (skb_queue_len(&sk->sk_write_queue) == 1) {

		/* Only one fragment on the socket.  */

		skb->csum_start = skb_transport_header(skb) - skb->head;

		skb->csum_offset = offsetof(struct udphdr, check);

		uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0);

	} else {

		/*

		 * HW-checksum won't work as there are two or more

		 * fragments on the socket so that all csums of sk_buffs

		 * should be together

		 */

		offset = skb_transport_offset(skb);

		skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);



		skb->ip_summed = CHECKSUM_NONE;



		skb_queue_walk(&sk->sk_write_queue, skb) {

			csum = csum_add(csum, skb->csum);

		}



		uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP,

					    csum);

		if (uh->check == 0)

			uh->check = CSUM_MANGLED_0;

	}

}



/*

 *	Sending

 */
@@ -668,7 +709,11 @@ static int udp_v6_push_pending_frames(struct sock *sk) 


	if (is_udplite)

		csum = udplite_csum_outgoing(sk, skb);

	 else

	else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */

		udp6_hwcsum_outgoing(sk, skb, &fl->fl6_src, &fl->fl6_dst,

				     up->len);

		goto send;

	} else

		csum = udp_csum_outgoing(sk, skb);



	/* add protocol-dependent pseudo-header */
@@ -677,6 +722,7 @@ static int udp_v6_push_pending_frames(struct sock *sk) 
	if (uh->check == 0)

		uh->check = CSUM_MANGLED_0;



send:

	err = ip6_push_pending_frames(sk);

out:

	up->len = 0;