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, 3 insertions, 1 deletions

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index c11a44ea1bf4..06a4c0fd7bef 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -361,6 +361,7 @@ typedef unsigned char *sk_buff_data_t;
  *              ports.
  *      @wifi_acked_valid: wifi_acked was set
  *      @wifi_acked: whether frame was acked on wifi or not
+ *      @no_fcs:  Request NIC to treat last 4 bytes as Ethernet FCS
  *      @dma_cookie: a cookie to one of several possible DMA operations
  *              done by skb DMA functions
  *      @secmark: security marking
@@ -459,7 +460,8 @@ struct sk_buff {
         __u8                    l4_rxhash:1;
         __u8                    wifi_acked_valid:1;
         __u8                    wifi_acked:1;
-        /* 10/12 bit hole (depending on ndisc_nodetype presence) */
+        __u8                    no_fcs:1;
+        /* 9/11 bit hole (depending on ndisc_nodetype presence) */
         kmemcheck_bitfield_end(flags2);
 
 #ifdef CONFIG_NET_DMA