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authorAnton Blanchard <anton@samba.org>2014-08-22 11:36:52 +1000
committerDavid S. Miller <davem@davemloft.net>2014-08-22 11:28:00 -0700
commitcbd5228199d8be45d895d9d0cc2b8ce53835fc21 (patch)
treedf032719e32933827db5e1ef205f257f5a0b54df /drivers/net
parentc10e4cafa2698dedb9b61bbf6d68f209e779cb19 (diff)
ibmveth: Fix endian issues with rx_no_buffer statistic
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@samba.org> Cc: stable@vger.kernel.org Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/ethernet/ibm/ibmveth.c18
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/net/ethernet/ibm/ibmveth.c b/drivers/net/ethernet/ibm/ibmveth.c
index c9127562bd22..21978cc019e7 100644
--- a/drivers/net/ethernet/ibm/ibmveth.c
+++ b/drivers/net/ethernet/ibm/ibmveth.c
@@ -292,6 +292,18 @@ 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)
{
@@ -307,8 +319,7 @@ 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 */
@@ -698,8 +709,7 @@ 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);