linux-kernel - [PATCH 3.12 140/142] ibmveth: Fix endian issues with rx_no

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Message-Id: <e66983c5b25182a5e1ebc3ab4f68f613eb1c9fe8.1411724724.git.jslaby@suse.cz>
Date:	Fri, 26 Sep 2014 11:45:51 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Anton Blanchard <anton@...ba.org>,
	"David S. Miller" <davem@...emloft.net>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 140/142] ibmveth: Fix endian issues with rx_no_buffer statistic

From: Anton Blanchard <anton@...ba.org>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit cbd5228199d8be45d895d9d0cc2b8ce53835fc21 upstream.

Hidden away in the last 8 bytes of the buffer_list page is a solitary
statistic. It needs to be byte swapped or else ethtool -S will
produce numbers that terrify the user.

Since we do this in multiple places, create a helper function with a
comment explaining what is going on.

Signed-off-by: Anton Blanchard <anton@...ba.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/net/ethernet/ibm/ibmveth.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c
index 6c0fd8e0f9bf..895b086ec261 100644
--- a/drivers/net/ethernet/ibm/ibmveth.c
+++ b/drivers/net/ethernet/ibm/ibmveth.c
@@ -293,6 +293,18 @@ failure:
 	atomic_add(buffers_added, &(pool->available));
 }
 
+/*
+ * The final 8 bytes of the buffer list is a counter of frames dropped
+ * because there was not a buffer in the buffer list capable of holding
+ * the frame.
+ */
+static void ibmveth_update_rx_no_buffer(struct ibmveth_adapter *adapter)
+{
+	__be64 *p = adapter->buffer_list_addr + 4096 - 8;
+
+	adapter->rx_no_buffer = be64_to_cpup(p);
+}
+
 /* replenish routine */
 static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
 {
@@ -308,8 +320,7 @@ static void ibmveth_replenish_task(struct ibmveth_adapter *adapter)
 			ibmveth_replenish_buffer_pool(adapter, pool);
 	}
 
-	adapter->rx_no_buffer = *(u64 *)(((char*)adapter->buffer_list_addr) +
-						4096 - 8);
+	ibmveth_update_rx_no_buffer(adapter);
 }
 
 /* empty and free ana buffer pool - also used to do cleanup in error paths */
@@ -699,8 +710,7 @@ static int ibmveth_close(struct net_device *netdev)
 
 	free_irq(netdev->irq, netdev);
 
-	adapter->rx_no_buffer = *(u64 *)(((char *)adapter->buffer_list_addr) +
-						4096 - 8);
+	ibmveth_update_rx_no_buffer(adapter);
 
 	ibmveth_cleanup(adapter);
 
-- 
2.1.0

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