Commit 8dc92f7e authored by Jesse Brandeburg's avatar Jesse Brandeburg Committed by David S. Miller
Browse files

sctp: add feature bit for SCTP offload in hardware 



this is the sctp code to enable hardware crc32c offload for
adapters that support it.

Originally by: Vlad Yasevich <vladislav.yasevich@hp.com>

modified by Jesse Brandeburg <jesse.brandeburg@intel.com>

Signed-off-by: default avatarJesse Brandeburg <jesse.brandeburg@intel.com>
Signed-off-by: default avatarVlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: default avatarJeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 182ff8df

include/linux/netdevice.h

+2 −0
Original line number Diff line number Diff line
@@ -670,7 +670,9 @@ struct net_device 
#define NETIF_F_GRO		16384	/* Generic receive offload */

#define NETIF_F_LRO		32768	/* large receive offload */



/* the GSO_MASK reserves bits 16 through 23 */

#define NETIF_F_FCOE_CRC	(1 << 24) /* FCoE CRC32 */

#define NETIF_F_SCTP_CSUM	(1 << 25) /* SCTP checksum offload */



	/* Segmentation offload features */

#define NETIF_F_GSO_SHIFT	16

net/sctp/output.c

+14 −3
Original line number Diff line number Diff line
@@ -412,6 +412,7 @@ int sctp_packet_transmit(struct sctp_packet *packet) 


	/* Build the SCTP header.  */

	sh = (struct sctphdr *)skb_push(nskb, sizeof(struct sctphdr));

	skb_reset_transport_header(nskb);

	sh->source = htons(packet->source_port);

	sh->dest   = htons(packet->destination_port);
@@ -527,15 +528,25 @@ int sctp_packet_transmit(struct sctp_packet *packet) 
	 * Note: Adler-32 is no longer applicable, as has been replaced

	 * by CRC32-C as described in <draft-ietf-tsvwg-sctpcsum-02.txt>.

	 */

	if (!sctp_checksum_disable && !(dst->dev->features & NETIF_F_NO_CSUM)) {

	if (!sctp_checksum_disable &&

	    !(dst->dev->features & (NETIF_F_NO_CSUM | NETIF_F_SCTP_CSUM))) {

		__u32 crc32 = sctp_start_cksum((__u8 *)sh, cksum_buf_len);



		/* 3) Put the resultant value into the checksum field in the

		 *    common header, and leave the rest of the bits unchanged.

		 */

		sh->checksum = sctp_end_cksum(crc32);

	} else

	} else {

		if (dst->dev->features & NETIF_F_SCTP_CSUM) {

			/* no need to seed psuedo checksum for SCTP */

			nskb->ip_summed = CHECKSUM_PARTIAL;

			nskb->csum_start = (skb_transport_header(nskb) -

			                    nskb->head);

			nskb->csum_offset = offsetof(struct sctphdr, checksum);

		} else {

			nskb->ip_summed = CHECKSUM_UNNECESSARY;

		}

	}



	/* IP layer ECN support

	 * From RFC 2481

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