[NET]: Detect hardware rx checksum faults correctly
Here is the patch that introduces the generic skb_checksum_complete
which also checks for hardware RX checksum faults. If that happens,
it'll call netdev_rx_csum_fault which currently prints out a stack
trace with the device name. In future it can turn off RX checksum.
I've converted every spot under net/ that does RX checksum checks to
use skb_checksum_complete or __skb_checksum_complete with the
exceptions of:
* Those places where checksums are done bit by bit. These will call
netdev_rx_csum_fault directly.
* The following have not been completely checked/converted:
ipmr
ip_vs
netfilter
dccp
This patch is based on patches and suggestions from Stephen Hemminger
and David S. Miller.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/rxrpc/transport.c b/net/rxrpc/transport.c
index 122c086..dbe6105 100644
--- a/net/rxrpc/transport.c
+++ b/net/rxrpc/transport.c
@@ -23,6 +23,7 @@
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/icmp.h>
+#include <linux/skbuff.h>
#include <net/sock.h>
#include <net/ip.h>
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
@@ -475,15 +476,11 @@
/* we'll probably need to checksum it (didn't call
* sock_recvmsg) */
- if (pkt->ip_summed != CHECKSUM_UNNECESSARY) {
- if ((unsigned short)
- csum_fold(skb_checksum(pkt, 0, pkt->len,
- pkt->csum))) {
- kfree_skb(pkt);
- rxrpc_krxiod_queue_transport(trans);
- _leave(" CSUM failed");
- return;
- }
+ if (skb_checksum_complete(pkt)) {
+ kfree_skb(pkt);
+ rxrpc_krxiod_queue_transport(trans);
+ _leave(" CSUM failed");
+ return;
}
addr = pkt->nh.iph->saddr;
