linux-kernel - [PATCH 2/9] aoe: print warning regarding a common reason for dropped transmits

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Date:	Mon, 15 Oct 2012 18:42:43 -0700
From:	Ed Cashin <ecashin@...aid.com>
To:	akpm@...ux-foundation.org
Cc:	ecashin@...aid.com, linux-kernel@...r.kernel.org
Subject: [PATCH 2/9] aoe: print warning regarding a common reason for dropped transmits

Dropped transmits are not common, but when they do occur, increasing
the transmit queue length often helps.

Signed-off-by: Ed Cashin <ecashin@...aid.com>
---
 drivers/block/aoe/aoenet.c |   11 +++++++++--
 1 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/block/aoe/aoenet.c b/drivers/block/aoe/aoenet.c
index 162c647..a1bb692 100644
--- a/drivers/block/aoe/aoenet.c
+++ b/drivers/block/aoe/aoenet.c
@@ -50,7 +50,11 @@ __setup("aoe_iflist=", aoe_iflist_setup);
 static spinlock_t txlock;
 static struct sk_buff_head skbtxq;
 
-/* enters with txlock held */
+/* enters with txlock held
+ *
+ * Use __must_hold(&txlock) for sparse when upcoming patch adds it to
+ * compiler.h.
+ */
 static int
 tx(void)
 {
@@ -58,7 +62,10 @@ tx(void)
 
 	while ((skb = skb_dequeue(&skbtxq))) {
 		spin_unlock_irq(&txlock);
-		dev_queue_xmit(skb);
+		if (dev_queue_xmit(skb) == NET_XMIT_DROP && net_ratelimit())
+			pr_warn("aoe: packet could not be sent on %s.  %s\n",
+				skb->dev ? skb->dev->name : "netif",
+				"consider increasing tx_queue_len");
 		spin_lock_irq(&txlock);
 	}
 	return 0;
-- 
1.7.1

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