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ibmveth: Fix endian issues with rx_no_buffer statistic 

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@samba.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Anton Blanchard 2014-08-22 11:36:52 +10:00 committed by Greg Kroah-Hartman
parent 4e2bd06d10
commit 0d334226ee
1 changed files with 14 additions and 4 deletions
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18
drivers/net/ethernet/ibm/ibmveth.c
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@ -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 */
@ -689,8 +700,7 @@ 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);