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: Jesse Brandeburg <jesse.brandeburg@intel.com> Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -670,7 +670,9 @@ struct net_device
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#define NETIF_F_GRO 16384 /* Generic receive offload */
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#define NETIF_F_LRO 32768 /* large receive offload */
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/* the GSO_MASK reserves bits 16 through 23 */
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#define NETIF_F_FCOE_CRC (1 << 24) /* FCoE CRC32 */
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#define NETIF_F_SCTP_CSUM (1 << 25) /* SCTP checksum offload */
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/* Segmentation offload features */
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#define NETIF_F_GSO_SHIFT 16
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@ -412,6 +412,7 @@ int sctp_packet_transmit(struct sctp_packet *packet)
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/* Build the SCTP header. */
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sh = (struct sctphdr *)skb_push(nskb, sizeof(struct sctphdr));
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skb_reset_transport_header(nskb);
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sh->source = htons(packet->source_port);
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sh->dest = htons(packet->destination_port);
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@ -527,15 +528,25 @@ int sctp_packet_transmit(struct sctp_packet *packet)
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* Note: Adler-32 is no longer applicable, as has been replaced
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* by CRC32-C as described in <draft-ietf-tsvwg-sctpcsum-02.txt>.
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*/
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if (!sctp_checksum_disable && !(dst->dev->features & NETIF_F_NO_CSUM)) {
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if (!sctp_checksum_disable &&
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!(dst->dev->features & (NETIF_F_NO_CSUM | NETIF_F_SCTP_CSUM))) {
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__u32 crc32 = sctp_start_cksum((__u8 *)sh, cksum_buf_len);
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/* 3) Put the resultant value into the checksum field in the
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* common header, and leave the rest of the bits unchanged.
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*/
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sh->checksum = sctp_end_cksum(crc32);
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} else
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nskb->ip_summed = CHECKSUM_UNNECESSARY;
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} else {
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if (dst->dev->features & NETIF_F_SCTP_CSUM) {
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/* no need to seed psuedo checksum for SCTP */
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nskb->ip_summed = CHECKSUM_PARTIAL;
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nskb->csum_start = (skb_transport_header(nskb) -
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nskb->head);
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nskb->csum_offset = offsetof(struct sctphdr, checksum);
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} else {
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nskb->ip_summed = CHECKSUM_UNNECESSARY;
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}
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}
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/* IP layer ECN support
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* From RFC 2481
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