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authorAlexander Duyck <alexander.h.duyck@intel.com>2012-08-08 05:23:22 +0000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-02-17 10:46:20 -0800
commitf4dc0e6ec906da70d1edf6d00f49b792f47f2efd (patch)
tree8802498984ae746212dc308b443ba70259e53141
parente862f5583a92ac9680bdb18a0e5dffe2a2c3d464 (diff)
igb: Remove artificial restriction on RQDPC stat reading
commit ae1c07a6b7ced6c0c94c99e3b53f4e7856fa8bff 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>
-rw-r--r--drivers/net/igb/igb_main.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 97f46ac4f217..a5d98a348a83 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -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);