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

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
......@@ -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
......
......@@ -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* Note: Adler-32 is no longer applicable, as has been replaced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
nskb->ip_summed = CHECKSUM_UNNECESSARY;
} 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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