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authorTom Herbert <therbert@google.com>2015-02-03 03:07:34 +0300
committerDavid S. Miller <davem@davemloft.net>2015-02-05 00:54:07 +0300
commitdcdc8994697faa789669c3fdaca1a8bc27a8f356 (patch)
treea105b07298d337a0b04b114422638768c3ee9266 /include/linux/skbuff.h
parent9a05dde59a35eee5643366d3d1e1f43fc9069adb (diff)
downloadlinux-dcdc8994697faa789669c3fdaca1a8bc27a8f356.tar.xz
net: add skb functions to process remote checksum offload
This patch adds skb_remcsum_process and skb_gro_remcsum_process to perform the appropriate adjustments to the skb when receiving remote checksum offload. Updated vxlan and gue to use these functions. Tested: Ran TCP_RR and TCP_STREAM netperf for VXLAN and GUE, did not see any change in performance. Signed-off-by: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/skbuff.h')
-rw-r--r--include/linux/skbuff.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 2748ff639144..5405dfe02572 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -3099,6 +3099,27 @@ do { \
compute_pseudo(skb, proto)); \
} while (0)
+/* Update skbuf and packet to reflect the remote checksum offload operation.
+ * When called, ptr indicates the starting point for skb->csum when
+ * ip_summed is CHECKSUM_COMPLETE. If we need create checksum complete
+ * here, skb_postpull_rcsum is done so skb->csum start is ptr.
+ */
+static inline void skb_remcsum_process(struct sk_buff *skb, void *ptr,
+ int start, int offset)
+{
+ __wsum delta;
+
+ if (unlikely(skb->ip_summed != CHECKSUM_COMPLETE)) {
+ __skb_checksum_complete(skb);
+ skb_postpull_rcsum(skb, skb->data, ptr - (void *)skb->data);
+ }
+
+ delta = remcsum_adjust(ptr, skb->csum, start, offset);
+
+ /* Adjust skb->csum since we changed the packet */
+ skb->csum = csum_add(skb->csum, delta);
+}
+
#if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE)
void nf_conntrack_destroy(struct nf_conntrack *nfct);
static inline void nf_conntrack_put(struct nf_conntrack *nfct)