[NET]: Split skb->csum

... into anonymous union of __wsum and __u32 (csum and csum_offset resp.)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>

15 files changed, 22 insertions, 19 deletions

diff --git a/drivers/net/cassini.c b/drivers/net/cassini.c
index 521c5b71023c..fd2cc13f7d97 100644
--- a/drivers/net/cassini.c
+++ b/drivers/net/cassini.c
@@ -2825,7 +2825,7 @@ static inline int cas_xmit_tx_ringN(struct cas *cp, int ring,
                 u64 csum_start_off, csum_stuff_off;
 
                 csum_start_off = (u64) (skb->h.raw - skb->data);
-                csum_stuff_off = (u64) ((skb->h.raw + skb->csum) - skb->data);
+                csum_stuff_off = csum_start_off + skb->csum_offset;
 
                 ctrl =  TX_DESC_CSUM_EN |
                         CAS_BASE(TX_DESC_CSUM_START, csum_start_off) |
diff --git a/drivers/net/e1000/e1000_main.c b/drivers/net/e1000/e1000_main.c
index 7a0828869ecf..32dde0adb683 100644
--- a/drivers/net/e1000/e1000_main.c
+++ b/drivers/net/e1000/e1000_main.c
@@ -2826,7 +2826,7 @@ e1000_tx_csum(struct e1000_adapter *adapter, struct e1000_tx_ring *tx_ring,
                 context_desc = E1000_CONTEXT_DESC(*tx_ring, i);
 
                 context_desc->upper_setup.tcp_fields.tucss = css;
-                context_desc->upper_setup.tcp_fields.tucso = css + skb->csum;
+                context_desc->upper_setup.tcp_fields.tucso = css + skb->csum_offset;
                 context_desc->upper_setup.tcp_fields.tucse = 0;
                 context_desc->tcp_seg_setup.data = 0;
                 context_desc->cmd_and_length = cpu_to_le32(E1000_TXD_CMD_DEXT);
diff --git a/drivers/net/ixgb/ixgb_main.c b/drivers/net/ixgb/ixgb_main.c
index e09f575a3a38..7b127212e62b 100644
--- a/drivers/net/ixgb/ixgb_main.c
+++ b/drivers/net/ixgb/ixgb_main.c
@@ -1249,7 +1249,7 @@ ixgb_tx_csum(struct ixgb_adapter *adapter, struct sk_buff *skb)
         if(likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
                 struct ixgb_buffer *buffer_info;
                 css = skb->h.raw - skb->data;
-                cso = (skb->h.raw + skb->csum) - skb->data;
+                cso = css + skb->csum_offset;
 
                 i = adapter->tx_ring.next_to_use;
                 context_desc = IXGB_CONTEXT_DESC(adapter->tx_ring, i);
diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c
index 806081b59733..36350e6db1c1 100644
--- a/drivers/net/myri10ge/myri10ge.c
+++ b/drivers/net/myri10ge/myri10ge.c
@@ -1955,7 +1955,7 @@ again:
         flags = (MXGEFW_FLAGS_NO_TSO | MXGEFW_FLAGS_FIRST);
         if (likely(skb->ip_summed == CHECKSUM_PARTIAL)) {
                 cksum_offset = (skb->h.raw - skb->data);
-                pseudo_hdr_offset = (skb->h.raw + skb->csum) - skb->data;
+                pseudo_hdr_offset = cksum_offset + skb->csum_offset;
                 /* If the headers are excessively large, then we must
                  * fall back to a software checksum */
                 if (unlikely(cksum_offset > 255 || pseudo_hdr_offset > 127)) {
diff --git a/drivers/net/sk98lin/skge.c b/drivers/net/sk98lin/skge.c
index a5d41ebc9fb4..12cbfd190dd7 100644
--- a/drivers/net/sk98lin/skge.c
+++ b/drivers/net/sk98lin/skge.c
@@ -1562,7 +1562,7 @@ struct sk_buff	*pMessage)	/* pointer to send-message              */
 
         if (pMessage->ip_summed == CHECKSUM_PARTIAL) {
                 u16 hdrlen = pMessage->h.raw - pMessage->data;
-                u16 offset = hdrlen + pMessage->csum;
+                u16 offset = hdrlen + pMessage->csum_offset;
 
                 if ((pMessage->h.ipiph->protocol == IPPROTO_UDP ) &&
                         (pAC->GIni.GIChipRev == 0) &&
@@ -1681,7 +1681,7 @@ struct sk_buff	*pMessage)	/* pointer to send-message              */
         */
         if (pMessage->ip_summed == CHECKSUM_PARTIAL) {
                 u16 hdrlen = pMessage->h.raw - pMessage->data;
-                u16 offset = hdrlen + pMessage->csum;
+                u16 offset = hdrlen + pMessage->csum_offset;
 
                 Control = BMU_STFWD;
 
diff --git a/drivers/net/skge.c b/drivers/net/skge.c
index 27b537c8d5e3..5513907e8393 100644
--- a/drivers/net/skge.c
+++ b/drivers/net/skge.c
@@ -2565,7 +2565,7 @@ static int skge_xmit_frame(struct sk_buff *skb, struct net_device *dev)
 
                 td->csum_offs = 0;
                 td->csum_start = offset;
-                td->csum_write = offset + skb->csum;
+                td->csum_write = offset + skb->csum_offset;
         } else
                 control = BMU_CHECK;
 
diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 0ef1848b9761..842abd9396c6 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -1350,7 +1350,7 @@ static int sky2_xmit_frame(struct sk_buff *skb, struct net_device *dev)
                 u32 tcpsum;
 
                 tcpsum = offset << 16;          /* sum start */
-                tcpsum |= offset + skb->csum;   /* sum write */
+                tcpsum |= offset + skb->csum_offset;    /* sum write */
 
                 ctrl = CALSUM | WR_SUM | INIT_SUM | LOCK_SUM;
                 if (skb->nh.iph->protocol == IPPROTO_UDP)
diff --git a/drivers/net/sungem.c b/drivers/net/sungem.c
index 253e96e7ad20..334c6cfd6595 100644
--- a/drivers/net/sungem.c
+++ b/drivers/net/sungem.c
@@ -1030,7 +1030,7 @@ static int gem_start_xmit(struct sk_buff *skb, struct net_device *dev)
                 u64 csum_start_off, csum_stuff_off;
 
                 csum_start_off = (u64) (skb->h.raw - skb->data);
-                csum_stuff_off = (u64) ((skb->h.raw + skb->csum) - skb->data);
+                csum_stuff_off = csum_start_off + skb->csum_offset;
 
                 ctrl = (TXDCTRL_CENAB |
                         (csum_start_off << 15) |
diff --git a/drivers/net/sunhme.c b/drivers/net/sunhme.c
index 9d7cd130c19d..ec432ea879fb 100644
--- a/drivers/net/sunhme.c
+++ b/drivers/net/sunhme.c
@@ -2272,7 +2272,7 @@ static int happy_meal_start_xmit(struct sk_buff *skb, struct net_device *dev)
                 u32 csum_start_off, csum_stuff_off;
 
                 csum_start_off = (u32) (skb->h.raw - skb->data);
-                csum_stuff_off = (u32) ((skb->h.raw + skb->csum) - skb->data);
+                csum_stuff_off = csum_start_off + skb->csum_offset;
 
                 tx_flags = (TXFLAG_OWN | TXFLAG_CSENABLE |
                             ((csum_start_off << 14) & TXFLAG_CSBUFBEGIN) |
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index fcab543d79ac..14ec16d2d9ba 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -274,7 +274,10 @@ struct sk_buff {
         unsigned int            len,
                                 data_len,
                                 mac_len;
-        __wsum                  csum;
+        union {
+                __wsum          csum;
+                __u32           csum_offset;
+        };
         __u32                   priority;
         __u8                    local_df:1,
                                 cloned:1,
diff --git a/net/core/dev.c b/net/core/dev.c
index 1a36b17f4b51..59d058a3b504 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1191,9 +1191,9 @@ int skb_checksum_help(struct sk_buff *skb)
 
         offset = skb->tail - skb->h.raw;
         BUG_ON(offset <= 0);
-        BUG_ON(skb->csum + 2 > offset);
+        BUG_ON(skb->csum_offset + 2 > offset);
 
-        *(__sum16*)(skb->h.raw + skb->csum) = csum_fold(csum);
+        *(__sum16*)(skb->h.raw + skb->csum_offset) = csum_fold(csum);
 
 out_set_summed:
         skb->ip_summed = CHECKSUM_NONE;
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 07c25d601922..a90bc439488e 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -1414,7 +1414,7 @@ void skb_copy_and_csum_dev(const struct sk_buff *skb, u8 *to)
                                               skb->len - csstart, 0);
 
         if (skb->ip_summed == CHECKSUM_PARTIAL) {
-                long csstuff = csstart + skb->csum;
+                long csstuff = csstart + skb->csum_offset;
 
                 *((__sum16 *)(to + csstuff)) = csum_fold(csum);
         }
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index e9d467124c4d..4913f25e5ad5 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -504,7 +504,7 @@ void tcp_v4_send_check(struct sock *sk, int len, struct sk_buff *skb)
         if (skb->ip_summed == CHECKSUM_PARTIAL) {
                 th->check = ~tcp_v4_check(th, len,
                                           inet->saddr, inet->daddr, 0);
-                skb->csum = offsetof(struct tcphdr, check);
+                skb->csum_offset = offsetof(struct tcphdr, check);
         } else {
                 th->check = tcp_v4_check(th, len, inet->saddr, inet->daddr,
                                          csum_partial((char *)th,
@@ -526,7 +526,7 @@ int tcp_v4_gso_send_check(struct sk_buff *skb)
 
         th->check = 0;
         th->check = ~tcp_v4_check(th, skb->len, iph->saddr, iph->daddr, 0);
-        skb->csum = offsetof(struct tcphdr, check);
+        skb->csum_offset = offsetof(struct tcphdr, check);
         skb->ip_summed = CHECKSUM_PARTIAL;
         return 0;
 }
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 28e4cf662ce0..1807a30694d9 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -422,7 +422,7 @@ static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
                 /*
                  * Only one fragment on the socket.
                  */
-                skb->csum = offsetof(struct udphdr, check);
+                skb->csum_offset = offsetof(struct udphdr, check);
                 uh->check = ~csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, 0);
         } else {
                 /*
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 0adb337c4b7e..517c50024bfc 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -948,7 +948,7 @@ static void tcp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
 
         if (skb->ip_summed == CHECKSUM_PARTIAL) {
                 th->check = ~csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP,  0);
-                skb->csum = offsetof(struct tcphdr, check);
+                skb->csum_offset = offsetof(struct tcphdr, check);
         } else {
                 th->check = csum_ipv6_magic(&np->saddr, &np->daddr, len, IPPROTO_TCP, 
                                             csum_partial((char *)th, th->doff<<2, 
@@ -970,7 +970,7 @@ static int tcp_v6_gso_send_check(struct sk_buff *skb)
         th->check = 0;
         th->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len,
                                      IPPROTO_TCP, 0);
-        skb->csum = offsetof(struct tcphdr, check);
+        skb->csum_offset = offsetof(struct tcphdr, check);
         skb->ip_summed = CHECKSUM_PARTIAL;
         return 0;
 }