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authorSridhar Samudrala <sri@us.ibm.com>2009-07-09 08:09:54 +0000
committerDavid S. Miller <davem@davemloft.net>2009-07-12 14:29:24 -0700
commit493c6be3fedfe24aa676949b237b9b104d911abf (patch)
tree9600f2491c61e1cac07b6da334c55536de7946c9 /net/ipv6/udp.c
parentd7ca4cc01fd154f2da30ae6dae160fa5800af758 (diff)
downloadlinux-493c6be3fedfe24aa676949b237b9b104d911abf.tar.bz2
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: Sridhar Samudrala <sri@us.ibm.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/udp.c')
-rw-r--r--net/ipv6/udp.c48
1 files changed, 47 insertions, 1 deletions
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 33b59bd92c4d..f31b1b9b0e0e 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -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;