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igb: Remove artificial restriction on RQDPC stat reading

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commit ae1c07a6b7 upstream.

For some reason the reading of the RQDPC register was being artificially
limited to 4K.  Instead of limiting the value we should read the value and
add the full amount.  Otherwise this can lead to a misleading number of
dropped packets when the actual value is in fact much higher.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Tested-by: Jeff Pieper   <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Cc: Vinson Lee <vlee@twitter.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexander Duyck
2012-08-08 05:23:22 +00:00
committed by Greg Kroah-Hartman
parent e862f5583a
commit f4dc0e6ec9
1 changed files with 5 additions and 3 deletions
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8
drivers/net/igb/igb_main.c
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@@ -4521,11 +4521,13 @@ void igb_update_stats(struct igb_adapter *adapter,
bytes = 0;
packets = 0;
for (i = 0; i < adapter->num_rx_queues; i++) {
u32 rqdpc_tmp = rd32(E1000_RQDPC(i)) & 0x0FFF;
u32 rqdpc = rd32(E1000_RQDPC(i));
struct igb_ring *ring = adapter->rx_ring[i];
ring->rx_stats.drops += rqdpc_tmp;
net_stats->rx_fifo_errors += rqdpc_tmp;
if (rqdpc) {
ring->rx_stats.drops += rqdpc;
net_stats->rx_fifo_errors += rqdpc;
}
do {
start = u64_stats_fetch_begin_bh(&ring->rx_syncp);