net: Add framework to allow sending packets with customized CRC.

This is useful for testing RX handling of frames with bad
CRCs.

Requires driver support to actually put the packet on the
wire properly.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Tested-by: Aaron Brown <aaron.f.brown@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/include/net/sock.h b/include/net/sock.h
index 9c0553b9e451..ba761e7de252 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -615,6 +615,10 @@ enum sock_flags {
         SOCK_RXQ_OVFL,
         SOCK_ZEROCOPY, /* buffers from userspace */
         SOCK_WIFI_STATUS, /* push wifi status to userspace */
+        SOCK_NOFCS, /* Tell NIC not to do the Ethernet FCS.
+                     * Will use last 4 bytes of packet sent from
+                     * user-space instead.
+                     */
 };
 
 static inline void sock_copy_flags(struct sock *nsk, struct sock *osk)