diff options
| author | Petri Gynther <pgynther@google.com> | 2015-03-11 01:55:00 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-03-12 00:54:55 +0300 |
| commit | d26ea6cc48da5a97d8188220c334cf3669fa8dc7 (patch) | |
| tree | d6408c7ced8b23593c980a9dac69c34a78b5c2ae /drivers/net/ethernet/broadcom/genet/bcmgenet.c | |
| parent | 61f0d861fc6924fa673ecf1128a911d49cb10dc8 (diff) | |
| download | linux-d26ea6cc48da5a97d8188220c334cf3669fa8dc7.tar.xz | |
net: bcmgenet: collect Rx discarded packet count
Bits 31:16 of RDMA_PROD_INDEX contain Rx discarded packet count, which
are the Rx packets that had to be dropped by MAC hardware since there
was no room on the Rx queue. Add code to collect this information into
the netdev stats.
Signed-off-by: Petri Gynther <pgynther@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ethernet/broadcom/genet/bcmgenet.c')
| -rw-r--r-- | drivers/net/ethernet/broadcom/genet/bcmgenet.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c index 275be56fd324..d3be1aeb7f47 100644 --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c @@ -1384,9 +1384,27 @@ static unsigned int bcmgenet_desc_rx(struct bcmgenet_priv *priv, int len, err; unsigned int rxpktprocessed = 0, rxpkttoprocess; unsigned int p_index; + unsigned int discards; unsigned int chksum_ok = 0; p_index = bcmgenet_rdma_ring_readl(priv, index, RDMA_PROD_INDEX); + + discards = (p_index >> DMA_P_INDEX_DISCARD_CNT_SHIFT) & + DMA_P_INDEX_DISCARD_CNT_MASK; + if (discards > ring->old_discards) { + discards = discards - ring->old_discards; + dev->stats.rx_missed_errors += discards; + dev->stats.rx_errors += discards; + ring->old_discards += discards; + + /* Clear HW register when we reach 75% of maximum 0xFFFF */ + if (ring->old_discards >= 0xC000) { + ring->old_discards = 0; + bcmgenet_rdma_ring_writel(priv, index, 0, + RDMA_PROD_INDEX); + } + } + p_index &= DMA_P_INDEX_MASK; if (likely(p_index >= ring->c_index)) |