From: Ben Hutchings <bhutchings@solarflare.com>
Date: Thu, 23 Feb 2012 00:45:50 +0000 (+0000)
Subject: sfc: Correct efx_for_each_possible_channel_tx_queue() to skip non-TX channels
X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=73e0026fb2bee4f2ca85c702040e143ec504eaa6;p=~shefty%2Frdma-dev.git

sfc: Correct efx_for_each_possible_channel_tx_queue() to skip non-TX channels

efx_for_each_possible_channel_tx_queue() should do nothing for RX-only
or extra channels.  The current definition results in allocating
additional unused hardware TX queues when using the mqprio qdisc and
either separate_tx_channels or SR-IOV.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
---

diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index 3fbec458c32..0b95505e896 100644
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -1030,9 +1030,12 @@ static inline bool efx_tx_queue_used(struct efx_tx_queue *tx_queue)
 
 /* Iterate over all possible TX queues belonging to a channel */
 #define efx_for_each_possible_channel_tx_queue(_tx_queue, _channel)	\
-	for (_tx_queue = (_channel)->tx_queue;				\
-	     _tx_queue < (_channel)->tx_queue + EFX_TXQ_TYPES;		\
-	     _tx_queue++)
+	if (!efx_channel_has_tx_queues(_channel))			\
+		;							\
+	else								\
+		for (_tx_queue = (_channel)->tx_queue;			\
+		     _tx_queue < (_channel)->tx_queue + EFX_TXQ_TYPES;	\
+		     _tx_queue++)
 
 static inline bool efx_channel_has_rx_queue(struct efx_channel *channel)
 {