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>

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 02c638a643ea347c5e1977eeb4992ab89b203933..9c065ac72e873945f655461517454d19cb477673 100644 (file)
--- 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 ce64c2b7ba55fa58a87614799ac44be7aa5cf49e..86687f58d613ffa4564b18860394a5be3893b1fc 100644 (file)
--- 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);