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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>
This commit is contained in:
Petri Gynther 2015-03-10 15:55:00 -07:00 committed by David S. Miller
parent 61f0d861fc
commit d26ea6cc48
2 changed files with 19 additions and 0 deletions
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18
drivers/net/ethernet/broadcom/genet/bcmgenet.c
View File

@ -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))

1
drivers/net/ethernet/broadcom/genet/bcmgenet.h
View File

@ -548,6 +548,7 @@ struct bcmgenet_rx_ring {
unsigned int read_ptr; /* Rx ring read pointer */
unsigned int cb_ptr; /* Rx ring initial CB ptr */
unsigned int end_ptr; /* Rx ring end CB ptr */
unsigned int old_discards;
};
/* device context */