[ofw] [IPoIB CM][Patch] receive Chksum flags

[Alex Estrin]

Hello,

Here is a patch to replace hardcoded TCP/IP Chksum flags indication 
with the same algorithm as used for datagram mode.

Please review.

Thanks,
Alex.

Index: kernel/ipoib_endpoint.c
===================================================================
--- kernel/ipoib_endpoint.c	(revision 1933)
+++ kernel/ipoib_endpoint.c	(working copy)
@@ -791,6 +791,7 @@
 	ipoib_cm_desc_t		*p_desc;
 	uint32_t				i = 0;
 	NDIS_PACKET				*p_packet;
+	NDIS_TCP_IP_CHECKSUM_PACKET_INFO	chksum;
 
 	IPOIB_ENTER( IPOIB_DBG_RECV );
 	UNUSED_PARAM( p_endpt );
@@ -813,12 +814,31 @@
 			p_port->cm_recv_mgr.depth--;
 			continue;
 		}
-		p_desc->ndis_csum.Value = 0;
-		p_desc->ndis_csum.Receive.NdisPacketTcpChecksumSucceeded = TRUE;
-		p_desc->ndis_csum.Receive.NdisPacketUdpChecksumSucceeded = TRUE;
-		p_desc->ndis_csum.Receive.NdisPacketIpChecksumSucceeded = TRUE;
-		NDIS_PER_PACKET_INFO_FROM_PACKET( p_packet, TcpIpChecksumPacketInfo ) =
-													(void*)(uintn_t)p_desc->ndis_csum.Value;
+		chksum.Value = 0;
+		switch( p_port->p_adapter->params.recv_chksum_offload )
+		{
+		default:
+			CL_ASSERT( FALSE );
+		case CSUM_DISABLED:
+			NDIS_PER_PACKET_INFO_FROM_PACKET( p_packet, TcpIpChecksumPacketInfo ) =
+				(void*)(uintn_t)chksum.Value;
+			break;
+		case CSUM_ENABLED:
+			/* Get the checksums directly from packet information. */
+			/* In this case, no one of cheksum's cat get false value */
+			/* If hardware checksum failed or wasn't calculated, NDIS will recalculate it again */
+			NDIS_PER_PACKET_INFO_FROM_PACKET( p_packet, TcpIpChecksumPacketInfo ) = 
+				(void*)(uintn_t)(p_desc->ndis_csum.Value);
+			break;
+		case CSUM_BYPASS:
+			/* Flag the checksums as having been calculated. */
+			chksum.Receive.NdisPacketTcpChecksumSucceeded = TRUE;
+			chksum.Receive.NdisPacketUdpChecksumSucceeded = TRUE;
+			chksum.Receive.NdisPacketIpChecksumSucceeded = TRUE;
+			NDIS_PER_PACKET_INFO_FROM_PACKET( p_packet, TcpIpChecksumPacketInfo ) =
+				(void*)(uintn_t)chksum.Value;
+			break;
+		}
 
 		NDIS_SET_PACKET_STATUS(	p_packet, NDIS_STATUS_SUCCESS );
 		p_port->cm_recv_mgr.recv_pkt_array[i] = p_packet;
Index: kernel/ipoib_port.c
===================================================================
--- kernel/ipoib_port.c	(revision 1933)
+++ kernel/ipoib_port.c	(working copy)
@@ -1082,16 +1082,6 @@
 			NdisWriteErrorLogEntry( p_port->p_adapter->h_adapter,
 				EVENT_IPOIB_CONNECTED_MODE_ERR, 1, 0xbadc0de2 );
 		}
-		else 
-		{
-			/* now we can adjust csum capabilities */
-		if (p_port->p_adapter->params.send_chksum_offload )
-			p_port->p_adapter->params.send_chksum_offload = CSUM_DISABLED;
-
-		if (p_port->p_adapter->params.recv_chksum_offload == CSUM_ENABLED)
-			p_port->p_adapter->params.recv_chksum_offload = CSUM_BYPASS;
-		}
-
 	}
 	IPOIB_EXIT( IPOIB_DBG_INIT );
 	return IB_SUCCESS;