net: introduce skb_crc32c_csum_help
skb_crc32c_csum_help is like skb_checksum_help, but it is designed for
checksumming SCTP packets using crc32c (see RFC3309), provided that
libcrc32c.ko has been loaded before. In case libcrc32c is not loaded,
invoking skb_crc32c_csum_help on a skb results in one the following
printouts:
warn_crc32c_csum_update: attempt to compute crc32c without libcrc32c.ko
warn_crc32c_csum_combine: attempt to compute crc32c without libcrc32c.ko
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index 0150b2dd..abbc72e 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -3931,6 +3931,7 @@ void netdev_rss_key_fill(void *buffer, size_t len);
int dev_get_nest_level(struct net_device *dev);
int skb_checksum_help(struct sk_buff *skb);
+int skb_crc32c_csum_help(struct sk_buff *skb);
struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
netdev_features_t features, bool tx_path);
struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index b1f46a0..62d6296 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -193,7 +193,8 @@
* accordingly. Note the there is no indication in the skbuff that the
* CHECKSUM_PARTIAL refers to an SCTP checksum, a driver that supports
* both IP checksum offload and SCTP CRC offload must verify which offload
- * is configured for a packet presumably by inspecting packet headers.
+ * is configured for a packet presumably by inspecting packet headers; in
+ * case, skb_crc32c_csum_help is provided to compute CRC on SCTP packets.
*
* NETIF_F_FCOE_CRC - This feature indicates that a device is capable of
* offloading the FCOE CRC in a packet. To perform this offload the stack