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net: systemport: log RX buffer allocation and RX/TX DMA failures

Browse source 
To help troubleshoot heavy memory pressure conditions, add a bunch of
statistics counter to log RX buffer allocation and RX/TX DMA mapping
failures. These are reported like any other counters through the ethtool
stats interface.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Florian Fainelli 2014-11-19 10:29:55 -08:00 committed by David S. Miller
parent 9c7077622d
commit 60b4ea1781
2 changed files with 12 additions and 1 deletions
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10
drivers/net/ethernet/broadcom/bcmsysport.c
View file

@ -274,6 +274,9 @@ static const struct bcm_sysport_stats bcm_sysport_gstrings_stats[] = {
/* RBUF misc statistics */
STAT_RBUF("rbuf_ovflow_cnt", mib.rbuf_ovflow_cnt, RBUF_OVFL_DISC_CNTR),
STAT_RBUF("rbuf_err_cnt", mib.rbuf_err_cnt, RBUF_ERR_PKT_CNTR),
STAT_MIB_RX("alloc_rx_buff_failed", mib.alloc_rx_buff_failed),
STAT_MIB_RX("rx_dma_failed", mib.rx_dma_failed),
STAT_MIB_TX("tx_dma_failed", mib.tx_dma_failed),
};
#define BCM_SYSPORT_STATS_LEN ARRAY_SIZE(bcm_sysport_gstrings_stats)
@ -477,6 +480,7 @@ static int bcm_sysport_rx_refill(struct bcm_sysport_priv *priv,
RX_BUF_LENGTH, DMA_FROM_DEVICE);
ret = dma_mapping_error(kdev, mapping);
if (ret) {
priv->mib.rx_dma_failed++;
bcm_sysport_free_cb(cb);
netif_err(priv, rx_err, ndev, "DMA mapping failure\n");
return ret;
@ -526,6 +530,7 @@ static unsigned int bcm_sysport_desc_rx(struct bcm_sysport_priv *priv,
unsigned int p_index;
u16 len, status;
struct bcm_rsb *rsb;
int ret;
/* Determine how much we should process since last call */
p_index = rdma_readl(priv, RDMA_PROD_INDEX);
@ -620,7 +625,9 @@ static unsigned int bcm_sysport_desc_rx(struct bcm_sysport_priv *priv,
napi_gro_receive(&priv->napi, skb);
refill:
bcm_sysport_rx_refill(priv, cb);
ret = bcm_sysport_rx_refill(priv, cb);
if (ret)
priv->mib.alloc_rx_buff_failed++;
}
return processed;
@ -973,6 +980,7 @@ static netdev_tx_t bcm_sysport_xmit(struct sk_buff *skb,
mapping = dma_map_single(kdev, skb->data, skb_len, DMA_TO_DEVICE);
if (dma_mapping_error(kdev, mapping)) {
priv->mib.tx_dma_failed++;
netif_err(priv, tx_err, dev, "DMA map failed at %p (len=%d)\n",
skb->data, skb_len);
ret = NETDEV_TX_OK;

3
drivers/net/ethernet/broadcom/bcmsysport.h
View file

@ -557,6 +557,9 @@ struct bcm_sysport_mib {
u32 rxchk_other_pkt_disc;
u32 rbuf_ovflow_cnt;
u32 rbuf_err_cnt;
u32 alloc_rx_buff_failed;
u32 rx_dma_failed;
u32 tx_dma_failed;
};
/* HW maintains a large list of counters */