[9front] [patch] ethervgbe: add rx checksum offloading

[Arne Meyer <meyer.arne83@netcologne.de>]

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Hello,

this patch implements rx tcp and udp checksum offloading for ipv4 for the ethervgbe nic driver.

Greetings,
Arne

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diff 4e75dd52d6dc4601e1f9912779c85f760e8d71e1 uncommitted
--- a/sys/src/9/pc/ethervgbe.c
+++ b/sys/src/9/pc/ethervgbe.c
@@ -298,6 +298,13 @@
 	RxDesc_Status_Shutdown	= (1<<30),	/* shutdown during RX */
 	RxDesc_Status_Own	= (1<<31),	/* own bit */
 
+	RxDesc_Control_Udp		= (1<<16),	/* UDP packet */ 
+	RxDesc_Control_Tcp		= (2<<16),	/* TCP packet */
+	RxDesc_Control_Ip		= (4<<16),	/* IP packet */
+
+	RxDesc_Control_Protocsum	= (2<<20),	/* TCP/UDP checksum ok */
+	RxDesc_Control_Ipcsum		= (4<<20),	/* IP checksum ok */
+
 	/* ... */
 	TxDesc_Status_Own	= (1<<31),	/* own bit */
 
@@ -310,6 +317,9 @@
 struct Stats
 {
 	ulong	rx;
+	ulong	tcpck;
+	ulong	udpck;
+	ulong	ipck;
 	ulong	tx;
 	ulong	txe;
 	ulong	intr;
@@ -468,6 +478,9 @@
 	l += snprint(p+l, READSTR-l, "tx: %uld\n", ctlr->stats.tx);
 	l += snprint(p+l, READSTR-l, "tx [errs]: %uld\n", ctlr->stats.txe);
 	l += snprint(p+l, READSTR-l, "rx: %uld\n", ctlr->stats.rx);
+	l += snprint(p+l, READSTR-l, "tcpck: %uld\n", ctlr->stats.tcpck);
+	l += snprint(p+l, READSTR-l, "udpck: %uld\n", ctlr->stats.udpck);
+	l += snprint(p+l, READSTR-l, "ipck: %uld\n", ctlr->stats.ipck);
 	l += snprint(p+l, READSTR-l, "intr: %uld\n", ctlr->stats.intr);
 	snprint(p+l, READSTR-l, "\n");
 
@@ -560,7 +573,7 @@
 	Ctlr* ctlr;
 	int i;
 	Block* block;
-	ulong length, status;
+	ulong length, status, control;
 	RxDesc* desc;
 
 	ctlr = edev->ctlr;
@@ -573,6 +586,7 @@
 		desc = &ctlr->rx_ring[i];
 
 		status = le32toh(desc->status);
+		control = le32toh(desc->control);
 
 		if(status & RxDesc_Status_Own)
 			continue;
@@ -589,6 +603,21 @@
 
 			/* remember the block */
 			block = ctlr->rx_blocks[i];
+
+			if(control & (RxDesc_Control_Tcp | RxDesc_Control_Protocsum)){
+				block->flag |= Btcpck;
+				ctlr->stats.tcpck++;
+			}
+
+			if(control & (RxDesc_Control_Udp | RxDesc_Control_Protocsum)){
+				block->flag |= Budpck;
+				ctlr->stats.udpck++;
+			}
+
+			if(control & (RxDesc_Control_Ip | RxDesc_Control_Ipcsum)){
+				block->flag |= Bipck;
+				ctlr->stats.ipck++;
+			}
 
 			/* plant new block, might fail if out of memory */
 			if(vgbenewrx(ctlr, i) == 0){