Staging: sxg: Add Checksum Offload support for Sahara SXG driver
* This patch adds support for offloading checksum to hardware.
IP checksum have been tested for IPv4 and IPv6.
Signed-off-by: LinSysSoft Sahara Team <saharaproj@linsyssoft.com>
Signed-off-by: Mithlesh Thukral <mithlesh@linsyssoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/staging/sxg/sxg.c b/drivers/staging/sxg/sxg.c
index 5d31e1b..da286f5 100644
--- a/drivers/staging/sxg/sxg.c
+++ b/drivers/staging/sxg/sxg.c
@@ -1078,6 +1078,7 @@
netdev->get_stats = sxg_get_stats;
netdev->set_multicast_list = sxg_mcast_set_list;
SET_ETHTOOL_OPS(netdev, &sxg_nic_ethtool_ops);
+ netdev->features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
err = sxg_set_interrupt_capability(adapter);
if (err != STATUS_SUCCESS)
DBG_ERROR("Cannot enable MSI-X capability\n");
@@ -1433,6 +1434,31 @@
}
/*
+ * sxg_rcv_checksum - Set the checksum for received packet
+ *
+ * Arguements:
+ * @skb - Packet which is receieved
+ * @Event - Event read from hardware
+ */
+
+void sxg_rcv_checksum(struct sk_buff *skb, struct sxg_event *Event)
+{
+ skb->ip_summed = CHECKSUM_NONE;
+ if(Event->Status & EVENT_STATUS_TCPIP) {
+ if(!(Event->Status & EVENT_STATUS_TCPBAD)) {
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+ if(!(Event->Status & EVENT_STATUS_IPBAD)) {
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+ } else if(Event->Status & EVENT_STATUS_IPONLY) {
+ if(!(Event->Status & EVENT_STATUS_IPBAD)) {
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+ }
+}
+
+/*
* sxg_process_event_queue - Process our event queue
*
* Arguments:
@@ -1506,9 +1532,7 @@
rx_bytes = Event->Length;
adapter->stats.rx_packets++;
adapter->stats.rx_bytes += rx_bytes;
-#if SXG_OFFLOAD_IP_CHECKSUM
- skb->ip_summed = CHECKSUM_UNNECESSARY;
-#endif
+ sxg_rcv_checksum(skb, Event);
skb->dev = adapter->netdev;
netif_receive_skb(skb);
#endif
@@ -2555,7 +2579,7 @@
SXG_LARGE_SEND_QUEUE_MASK));
}
} else if (skb->protocol == htons(ETH_P_IPV6)) {
- if ( (ipv6_hdr(skb)->nexthdr == IPPROTO_TCP) && (DataLength >=
+ if ((ipv6_hdr(skb)->nexthdr == IPPROTO_TCP) && (DataLength >=
sizeof(struct tcphdr)) ) {
queue_id = ((ntohs(tcp_hdr(skb)->dest) == ISCSI_PORT) ?
(ntohs (tcp_hdr(skb)->source) &
@@ -2629,6 +2653,20 @@
XmtCmd->Buffer.TotalLength = DataLength;
XmtCmd->SgEntries = 1;
XmtCmd->Flags = 0;
+
+ if (skb->ip_summed == CHECKSUM_PARTIAL) {
+ /*
+ * We need to set the Checkum in IP header to 0. This is
+ * required by hardware.
+ */
+ ip_hdr(skb)->check = 0x0;
+ XmtCmd->CsumFlags.Flags |= SXG_SLOWCMD_CSUM_IP;
+ XmtCmd->CsumFlags.Flags |= SXG_SLOWCMD_CSUM_TCP;
+ /* Dont know if length will require a change in case of VLAN */
+ XmtCmd->CsumFlags.MacLen = ETH_HLEN;
+ XmtCmd->CsumFlags.IpHl = skb_network_header_len(skb) >>
+ SXG_NW_HDR_LEN_SHIFT;
+ }
/*
* Advance transmit cmd descripter by 1.
* NOTE - See comments in SxgTcpOutput where we write
@@ -4064,6 +4102,8 @@
WRITE_REG(adapter->UcodeRegs[0].ReceiveChecksum,
SXG_RCV_TCP_CSUM_ENABLED | SXG_RCV_IP_CSUM_ENABLED, TRUE);
+ adapter->flags |= (SXG_RCV_TCP_CSUM_ENABLED | SXG_RCV_IP_CSUM_ENABLED );
+
/* Initialize the MAC, XAUI */
DBG_ERROR("sxg: %s ENTER sxg_initialize_link\n", __func__);
status = sxg_initialize_link(adapter);