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Commit 9914f053 authored by Mithlesh Thukral's avatar Mithlesh Thukral Committed by Greg Kroah-Hartman
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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: default avatarLinSysSoft Sahara Team <saharaproj@linsyssoft.com>
Signed-off-by: default avatarMithlesh Thukral <mithlesh@linsyssoft.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent c1f46a00

drivers/staging/sxg/sxg.c

+44 −4
Original line number Diff line number Diff line
@@ -1078,6 +1078,7 @@ static int sxg_entry_probe(struct pci_dev *pcidev, 
	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");
@@ -1432,6 +1433,31 @@ static int sxg_process_isr(struct adapter_t *adapter, u32 MessageId) 
	return (NewIsr);

}



/*

 * 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

 *
@@ -1506,9 +1532,7 @@ static u32 sxg_process_event_queue(struct adapter_t *adapter, u32 RssId, 
				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
@@ -2629,6 +2653,20 @@ static int sxg_dumb_sgl(struct sxg_x64_sgl *pSgl, 
	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 @@ static int sxg_initialize_adapter(struct adapter_t *adapter) 
	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);

drivers/staging/sxg/sxghif.h

+5 −1
Original line number Diff line number Diff line
@@ -1004,4 +1004,8 @@ struct sxg_ucode_stats { 
	u32  XNoBufs;		/* Xmt drop due to no DRAM Xmit buffer or PxyBuf */

};



/*

 * Macros for handling the Offload engine values

 */

/* Number of positions to shift Network Header Length before passing to card */

#define SXG_NW_HDR_LEN_SHIFT		2