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ethervgbe: reduce console spam (thanks Arne Meyer)

this patch turns "no Tx entry available" messages into
an ifstats counter to reduce console spam.

While here, remove tx/rx offloading from the todo list
to not give people  ideas.

--- a/sys/src/9/pc/ethervgbe.c

+++ b/sys/src/9/pc/ethervgbe.c

@@ -15,7 +15,6 @@

  *	- shutdown

  *	- promiscuous

  *	- report error

- *	- Rx/Tx Csum

  *	- Jumbo frames

  *

  * Philippe Anel, xigh@free.fr

@@ -312,6 +311,7 @@

 	ulong	rx;

 	ulong	tx;

 	ulong	txe;

+	ulong	txentry;

 	ulong	intr;

 };

@@ -467,6 +467,7 @@

 	l = 0;

 	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, "tx [no entry]: %uld\n", ctlr->stats.txentry);

 	l += snprint(p+l, READSTR-l, "rx: %uld\n", ctlr->stats.rx);

 	l += snprint(p+l, READSTR-l, "intr: %uld\n", ctlr->stats.intr);

 	snprint(p+l, READSTR-l, "\n");

@@ -803,7 +804,7 @@

 		wiob(ctlr, TxCsrS, TxCsr_Wakeup);

 	if(count == 0)

-		print("vgbe: transmit: no Tx entry available\n");

+		ctlr->stats.txentry++;

 }

 static void