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authorAlexander Duyck <aduyck@mirantis.com>2016-02-05 15:27:43 -0800
committerDavid S. Miller <davem@davemloft.net>2016-02-11 08:55:33 -0500
commit7fbeffed77c130ecf64e8a2f7f9d6d63a9d60a19 (patch)
tree42636ed2f16d1317554f3aa4f5b6915df83b47bf
parent76443456227097179c14826425f88a95d81a892e (diff)
downloadlinux-7fbeffed77c130ecf64e8a2f7f9d6d63a9d60a19.tar.bz2
net: Update remote checksum segmentation to support use of GSO checksum
This patch addresses two main issues. First in the case of remote checksum offload we were avoiding dealing with scatter-gather issues. As a result it would be possible to assemble a series of frames that used frags instead of being linearized as they should have if remote checksum offload was enabled. Second I have updated the code so that we now let GSO take care of doing the checksum on the data itself and drop the special case that was added for remote checksum offload. Signed-off-by: Alexander Duyck <aduyck@mirantis.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/core/skbuff.c10
-rw-r--r--net/ipv4/udp_offload.c22
2 files changed, 16 insertions, 16 deletions
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 02c638a643ea..9c065ac72e87 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -3098,8 +3098,9 @@ struct sk_buff *skb_segment(struct sk_buff *head_skb,
if (nskb->len == len + doffset)
goto perform_csum_check;
- if (!sg && !nskb->remcsum_offload) {
- nskb->ip_summed = CHECKSUM_NONE;
+ if (!sg) {
+ if (!nskb->remcsum_offload)
+ nskb->ip_summed = CHECKSUM_NONE;
SKB_GSO_CB(nskb)->csum =
skb_copy_and_csum_bits(head_skb, offset,
skb_put(nskb, len),
@@ -3171,8 +3172,9 @@ skip_fraglist:
nskb->truesize += nskb->data_len;
perform_csum_check:
- if (!csum && !nskb->remcsum_offload) {
- nskb->ip_summed = CHECKSUM_NONE;
+ if (!csum) {
+ if (!nskb->remcsum_offload)
+ nskb->ip_summed = CHECKSUM_NONE;
SKB_GSO_CB(nskb)->csum =
skb_checksum(nskb, doffset,
nskb->len - doffset, 0);
diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index ce64c2b7ba55..86687f58d613 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -66,6 +66,16 @@ static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb,
features &= skb->dev->hw_enc_features;
+ /* The only checksum offload we care about from here on out is the
+ * outer one so strip the existing checksum feature flags and
+ * instead set the flag based on our outer checksum offload value.
+ */
+ if (remcsum) {
+ features &= ~NETIF_F_CSUM_MASK;
+ if (offload_csum)
+ features |= NETIF_F_HW_CSUM;
+ }
+
/* segment inner packet. */
segs = gso_inner_segment(skb, features);
if (IS_ERR_OR_NULL(segs)) {
@@ -116,18 +126,6 @@ static struct sk_buff *__skb_udp_tunnel_segment(struct sk_buff *skb,
skb->ip_summed = CHECKSUM_PARTIAL;
skb->csum_start = skb_transport_header(skb) - skb->head;
skb->csum_offset = offsetof(struct udphdr, check);
- } else if (remcsum) {
- /* Need to calculate checksum from scratch,
- * inner checksums are never when doing
- * remote_checksum_offload.
- */
-
- skb->csum = skb_checksum(skb, udp_offset,
- skb->len - udp_offset,
- 0);
- uh->check = csum_fold(skb->csum);
- if (uh->check == 0)
- uh->check = CSUM_MANGLED_0;
} else {
uh->check = gso_make_checksum(skb, ~uh->check);