netdev - [PATCH 8/14] Spidernet RX Refill

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Date:	Wed, 13 Dec 2006 15:18:52 -0600
From:	linas@...tin.ibm.com (Linas Vepstas)
To:	Andrew Morton <akpm@...l.org>
Cc:	netdev@...r.kernel.org, linuxppc-dev@...abs.org, jgarzik@...ox.com,
	Christoph Hellwig <hch@...radead.org>,
	Ishizaki Kou <kou.ishizaki@...hiba.co.jp>,
	Jens Osterkamp <Jens.Osterkamp@....de>,
	James K Lewis <jim@...ewis.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 8/14] Spidernet RX Refill


The invocation of the rx ring refill routine is haphazard,
it can be called from a central location.

Signed-off-by: Linas Vepstas <linas@...tin.ibm.com>
Cc: James K Lewis <jklewis@...ibm.com>
Cc: Arnd Bergmann <arnd@...db.de>

----
 drivers/net/spider_net.c |   13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

Index: linux-2.6.19-git7/drivers/net/spider_net.c
===================================================================
--- linux-2.6.19-git7.orig/drivers/net/spider_net.c	2006-12-13 14:27:35.000000000 -0600
+++ linux-2.6.19-git7/drivers/net/spider_net.c	2006-12-13 14:28:11.000000000 -0600
@@ -980,17 +980,11 @@ spider_net_decode_one_descr(struct spide
 
 	status = spider_net_get_descr_status(descr);
 
-	/* nothing in the descriptor yet */
-	if (status == SPIDER_NET_DESCR_CARDOWNED)
+	/* Nothing in the descriptor, or ring must be empty */
+	if ((status == SPIDER_NET_DESCR_CARDOWNED) ||
+	    (status == SPIDER_NET_DESCR_NOT_IN_USE))
 		return 0;
 
-	if (status == SPIDER_NET_DESCR_NOT_IN_USE) {
-		/* not initialized yet, the ring must be empty */
-		spider_net_refill_rx_chain(card);
-		spider_net_enable_rxdmac(card);
-		return 0;
-	}
-
 	/* descriptor definitively used -- move on tail */
 	chain->tail = descr->next;
 
@@ -1074,6 +1068,7 @@ spider_net_poll(struct net_device *netde
 	netdev->quota -= packets_done;
 	*budget -= packets_done;
 	spider_net_refill_rx_chain(card);
+	spider_net_enable_rxdmac(card);
 
 	/* if all packets are in the stack, enable interrupts and return 0 */
 	/* if not, return 1 */
-
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