- if (!(dst->dev->features & NETIF_F_NO_CSUM)) {
- crc32 = sctp_start_cksum((__u8 *)sh, cksum_buf_len);
- crc32 = sctp_end_cksum(crc32);
- } else
- nskb->ip_summed = CHECKSUM_UNNECESSARY;
-
- /* 3) Put the resultant value into the checksum field in the
- * common header, and leave the rest of the bits unchanged.
- */
- sh->checksum = crc32;
+ 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 {
+ 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;
+ }
+ }