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Staging: sxg: Add Checksum Offload support for Sahara SXG driver

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* 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>
This commit is contained in:
Mithlesh Thukral 2009-02-18 18:51:29 +05:30 committed by Greg Kroah-Hartman
parent c1f46a001f
commit 9914f0536f
2 changed files with 49 additions and 5 deletions
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48
drivers/staging/sxg/sxg.c
View File

@ -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
@ -2555,7 +2579,7 @@ static int sxg_dumb_sgl(struct sxg_x64_sgl *pSgl,
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 @@ 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);

6
drivers/staging/sxg/sxghif.h
View File

@ -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