From 8dc92f7e2ecfd93f5c57da78594a7a5482e2c15e Mon Sep 17 00:00:00 2001 From: Jesse Brandeburg Date: Mon, 27 Apr 2009 22:35:52 +0000 Subject: [PATCH] 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 modified by Jesse Brandeburg Signed-off-by: Jesse Brandeburg Signed-off-by: Vlad Yasevich Signed-off-by: Jeff Kirsher Signed-off-by: David S. Miller --- include/linux/netdevice.h | 2 ++ net/sctp/output.c | 17 ++++++++++++++--- 2 files changed, 16 insertions(+), 3 deletions(-) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index fe20d171acf1..f8c3619d551f 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -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 diff --git a/net/sctp/output.c b/net/sctp/output.c index 7d08f522ec84..f0c91df59d4e 100644 --- a/net/sctp/output.c +++ b/net/sctp/output.c @@ -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destination_port); @@ -527,15 +528,25 @@ int sctp_packet_transmit(struct sctp_packet *packet) * Note: Adler-32 is no longer applicable, as has been replaced * by CRC32-C as described in . */ - 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 -- 2.20.1