[PATCH net-next v1 6/8] amd-xgbe: Add receive buffer unavailable statistic

[Tom Lendacky]

Add a statistic that tracks how many times an interrupt is generated for
a receive buffer not being available to the hardware which prevents the
hardware from being able to DMA the received data.

Signed-off-by: Tom Lendacky <thomas.lenda...@amd.com>
---
 drivers/net/ethernet/amd/xgbe/xgbe-drv.c     |    3 +++
 drivers/net/ethernet/amd/xgbe/xgbe-ethtool.c |    1 +
 drivers/net/ethernet/amd/xgbe/xgbe.h         |    1 +
 3 files changed, 5 insertions(+)

diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c 
b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
index aae9d5e..24212d2 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-drv.c
@@ -360,6 +360,9 @@ static irqreturn_t xgbe_isr(int irq, void *data)
                        }
                }
 
+               if (XGMAC_GET_BITS(dma_ch_isr, DMA_CH_SR, RBU))
+                       pdata->ext_stats.rx_buffer_unavailable++;
+
                /* Restart the device on a Fatal Bus Error */
                if (XGMAC_GET_BITS(dma_ch_isr, DMA_CH_SR, FBE))
                        schedule_work(&pdata->restart_work);
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-ethtool.c 
b/drivers/net/ethernet/amd/xgbe/xgbe-ethtool.c
index 95b6373..204fb3a 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe-ethtool.c
+++ b/drivers/net/ethernet/amd/xgbe/xgbe-ethtool.c
@@ -179,6 +179,7 @@ static const struct xgbe_stats xgbe_gstring_stats[] = {
        XGMAC_MMC_STAT("rx_watchdog_errors", rxwatchdogerror),
        XGMAC_MMC_STAT("rx_pause_frames", rxpauseframes),
        XGMAC_EXT_STAT("rx_split_header_packets", rx_split_header_packets),
+       XGMAC_EXT_STAT("rx_buffer_unavailable", rx_buffer_unavailable),
 };
 
 #define XGBE_STATS_COUNT       ARRAY_SIZE(xgbe_gstring_stats)
diff --git a/drivers/net/ethernet/amd/xgbe/xgbe.h 
b/drivers/net/ethernet/amd/xgbe/xgbe.h
index 5f9a1ab..a5f5a78 100644
--- a/drivers/net/ethernet/amd/xgbe/xgbe.h
+++ b/drivers/net/ethernet/amd/xgbe/xgbe.h
@@ -582,6 +582,7 @@ struct xgbe_mmc_stats {
 struct xgbe_ext_stats {
        u64 tx_tso_packets;
        u64 rx_split_header_packets;
+       u64 rx_buffer_unavailable;
 };
 
 struct xgbe_hw_if {

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