4 files changed, 31 insertions, 4 deletions

diff --git a/drivers/net/igb/e1000_82575.h b/drivers/net/igb/e1000_82575.h
index eaf977050368..0f16abab2565 100644
--- a/drivers/net/igb/e1000_82575.h
+++ b/drivers/net/igb/e1000_82575.h
@@ -130,6 +130,7 @@ struct e1000_adv_tx_context_desc {
 #define E1000_ADVTXD_MACLEN_SHIFT    9  /* Adv ctxt desc mac len shift */
 #define E1000_ADVTXD_TUCMD_IPV4    0x00000400  /* IP Packet Type: 1=IPv4 */
 #define E1000_ADVTXD_TUCMD_L4T_TCP 0x00000800  /* L4 Packet TYPE of TCP */
+#define E1000_ADVTXD_TUCMD_L4T_SCTP 0x00001000 /* L4 packet TYPE of SCTP */
 /* IPSec Encrypt Enable for ESP */
 #define E1000_ADVTXD_L4LEN_SHIFT     8  /* Adv ctxt L4LEN shift */
 #define E1000_ADVTXD_MSS_SHIFT      16  /* Adv ctxt MSS shift */
diff --git a/drivers/net/igb/e1000_defines.h b/drivers/net/igb/e1000_defines.h
index 65acbbaca2d5..3bda3db73f1f 100644
--- a/drivers/net/igb/e1000_defines.h
+++ b/drivers/net/igb/e1000_defines.h
@@ -291,6 +291,7 @@
 /* Receive Checksum Control */
 #define E1000_RXCSUM_IPOFL     0x00000100   /* IPv4 checksum offload */
 #define E1000_RXCSUM_TUOFL     0x00000200   /* TCP / UDP checksum offload */
+#define E1000_RXCSUM_CRCOFL    0x00000800   /* CRC32 offload enable */
 #define E1000_RXCSUM_PCSD      0x00002000   /* packet checksum disabled */
 
 /* Header split receive */
diff --git a/drivers/net/igb/igb_ethtool.c b/drivers/net/igb/igb_ethtool.c
index 27eae49e79c2..b1367ce6586e 100644
--- a/drivers/net/igb/igb_ethtool.c
+++ b/drivers/net/igb/igb_ethtool.c
@@ -293,10 +293,16 @@ static u32 igb_get_tx_csum(struct net_device *netdev)
 
 static int igb_set_tx_csum(struct net_device *netdev, u32 data)
 {
-        if (data)
+        struct igb_adapter *adapter = netdev_priv(netdev);
+
+        if (data) {
                 netdev->features |= (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
-        else
-                netdev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM);
+                if (adapter->hw.mac.type == e1000_82576)
+                        netdev->features |= NETIF_F_SCTP_CSUM;
+        } else {
+                netdev->features &= ~(NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
+                                      NETIF_F_SCTP_CSUM);
+        }
 
         return 0;
 }
diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index f7f861215242..bca7e9f76be4 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -1345,6 +1345,9 @@ static int __devinit igb_probe(struct pci_dev *pdev,
         if (pci_using_dac)
                 netdev->features |= NETIF_F_HIGHDMA;
 
+        if (adapter->hw.mac.type == e1000_82576)
+                netdev->features |= NETIF_F_SCTP_CSUM;
+
         adapter->en_mng_pt = igb_enable_mng_pass_thru(&adapter->hw);
 
         /* before reading the NVM, reset the controller to put the device in a
@@ -2249,6 +2252,10 @@ static void igb_configure_rx(struct igb_adapter *adapter)
         /* Don't need to set TUOFL or IPOFL, they default to 1 */
         if (!adapter->rx_csum)
                 rxcsum &= ~(E1000_RXCSUM_TUOFL | E1000_RXCSUM_IPOFL);
+        else if (adapter->hw.mac.type == e1000_82576)
+                /* Enable Receive Checksum Offload for SCTP */
+                rxcsum |= E1000_RXCSUM_CRCOFL;
+
         wr32(E1000_RXCSUM, rxcsum);
 
         /* Set the default pool for the PF's first queue */
@@ -3064,11 +3071,15 @@ static inline bool igb_tx_csum_adv(struct igb_adapter *adapter,
                                 tu_cmd |= E1000_ADVTXD_TUCMD_IPV4;
                                 if (ip_hdr(skb)->protocol == IPPROTO_TCP)
                                         tu_cmd |= E1000_ADVTXD_TUCMD_L4T_TCP;
+                                else if (ip_hdr(skb)->protocol == IPPROTO_SCTP)
+                                        tu_cmd |= E1000_ADVTXD_TUCMD_L4T_SCTP;
                                 break;
                         case cpu_to_be16(ETH_P_IPV6):
                                 /* XXX what about other V6 headers?? */
                                 if (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP)
                                         tu_cmd |= E1000_ADVTXD_TUCMD_L4T_TCP;
+                                else if (ipv6_hdr(skb)->nexthdr == IPPROTO_SCTP)
+                                        tu_cmd |= E1000_ADVTXD_TUCMD_L4T_SCTP;
                                 break;
                         default:
                                 if (unlikely(net_ratelimit()))
@@ -4449,14 +4460,22 @@ static inline void igb_rx_checksum_adv(struct igb_adapter *adapter,
         /* TCP/UDP checksum error bit is set */
         if (status_err &
             (E1000_RXDEXT_STATERR_TCPE | E1000_RXDEXT_STATERR_IPE)) {
+                /*
+                 * work around errata with sctp packets where the TCPE aka
+                 * L4E bit is set incorrectly on 64 byte (60 byte w/o crc)
+                 * packets, (aka let the stack check the crc32c)
+                 */
+                if (!((adapter->hw.mac.type == e1000_82576) &&
+                      (skb->len == 60)))
+                        adapter->hw_csum_err++;
                 /* let the stack verify checksum errors */
-                adapter->hw_csum_err++;
                 return;
         }
         /* It must be a TCP or UDP packet with a valid checksum */
         if (status_err & (E1000_RXD_STAT_TCPCS | E1000_RXD_STAT_UDPCS))
                 skb->ip_summed = CHECKSUM_UNNECESSARY;
 
+        dev_dbg(&adapter->pdev->dev, "cksum success: bits %08X\n", status_err);
         adapter->hw_csum_good++;
 }