net: bcmgenet: log RX buffer allocation and RX/TX dma failures
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>
diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
index da1a250..fcbf125 100644
--- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c
+++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c
@@ -613,6 +613,9 @@
UMAC_RBUF_OVFL_CNT),
STAT_GENET_MISC("rbuf_err_cnt", mib.rbuf_err_cnt, UMAC_RBUF_ERR_CNT),
STAT_GENET_MISC("mdf_err_cnt", mib.mdf_err_cnt, UMAC_MDF_ERR_CNT),
+ STAT_GENET_MIB_RX("alloc_rx_buff_failed", mib.alloc_rx_buff_failed),
+ STAT_GENET_MIB_RX("rx_dma_failed", mib.rx_dma_failed),
+ STAT_GENET_MIB_TX("tx_dma_failed", mib.tx_dma_failed),
};
#define BCMGENET_STATS_LEN ARRAY_SIZE(bcmgenet_gstrings_stats)
@@ -989,6 +992,7 @@
mapping = dma_map_single(kdev, skb->data, skb_len, DMA_TO_DEVICE);
ret = dma_mapping_error(kdev, mapping);
if (ret) {
+ priv->mib.tx_dma_failed++;
netif_err(priv, tx_err, dev, "Tx DMA map failed\n");
dev_kfree_skb(skb);
return ret;
@@ -1035,6 +1039,7 @@
skb_frag_size(frag), DMA_TO_DEVICE);
ret = dma_mapping_error(kdev, mapping);
if (ret) {
+ priv->mib.tx_dma_failed++;
netif_err(priv, tx_err, dev, "%s: Tx DMA map failed\n",
__func__);
return ret;
@@ -1231,6 +1236,7 @@
priv->rx_buf_len, DMA_FROM_DEVICE);
ret = dma_mapping_error(kdev, mapping);
if (ret) {
+ priv->mib.rx_dma_failed++;
bcmgenet_free_cb(cb);
netif_err(priv, rx_err, priv->dev,
"%s DMA map failed\n", __func__);
@@ -1397,8 +1403,10 @@
/* refill RX path on the current control block */
refill:
err = bcmgenet_rx_refill(priv, cb);
- if (err)
+ if (err) {
+ priv->mib.alloc_rx_buff_failed++;
netif_err(priv, rx_err, dev, "Rx refill failed\n");
+ }
rxpktprocessed++;
priv->rx_read_ptr++;