From 8dc92f7e2ecfd93f5c57da78594a7a5482e2c15e Mon Sep 17 00:00:00 2001
From: Jesse Brandeburg <jesse.brandeburg@intel.com>
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 <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>
---
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* Note: Adler-32 is no longer applicable, as has been replaced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 <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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