be2net: Add a dma_mapping_error counter in ethtool

Add a dma_mapping_error counter to count the number of packets dropped
due to DMA mapping errors.

Signed-off-by: Vasundhara Volam <vasundhara.volam@emulex.com>
Signed-off-by: Sathya Perla <sathya.perla@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 5 insertions, 1 deletions

diff --git a/drivers/net/ethernet/emulex/benet/be.h b/drivers/net/ethernet/emulex/benet/be.h
index d491ac614dcf..069bdda00c55 100644
--- a/drivers/net/ethernet/emulex/benet/be.h
+++ b/drivers/net/ethernet/emulex/benet/be.h
@@ -323,6 +323,7 @@ struct be_rx_obj {
 struct be_drv_stats {
         u32 be_on_die_temperature;
         u32 eth_red_drops;
+        u32 dma_map_errors;
         u32 rx_drops_no_pbuf;
         u32 rx_drops_no_txpb;
         u32 rx_drops_no_erx_descr;
diff --git a/drivers/net/ethernet/emulex/benet/be_ethtool.c b/drivers/net/ethernet/emulex/benet/be_ethtool.c
index 3a7ade4b313a..2fd38261bedb 100644
--- a/drivers/net/ethernet/emulex/benet/be_ethtool.c
+++ b/drivers/net/ethernet/emulex/benet/be_ethtool.c
@@ -119,6 +119,8 @@ static const struct be_ethtool_stat et_stats[] = {
          * is more than 9018 bytes
          */
         {DRVSTAT_INFO(rx_drops_mtu)},
+        /* Number of dma mapping errors */
+        {DRVSTAT_INFO(dma_map_errors)},
         /* Number of packets dropped due to random early drop function */
         {DRVSTAT_INFO(eth_red_drops)},
         {DRVSTAT_INFO(be_on_die_temperature)},
diff --git a/drivers/net/ethernet/emulex/benet/be_main.c b/drivers/net/ethernet/emulex/benet/be_main.c
index 7b6dbf880a66..6c2eb6978601 100644
--- a/drivers/net/ethernet/emulex/benet/be_main.c
+++ b/drivers/net/ethernet/emulex/benet/be_main.c
@@ -849,6 +849,7 @@ dma_err:
                 unmap_tx_frag(dev, wrb, map_single);
                 map_single = false;
                 copied -= wrb->frag_len;
+                adapter->drv_stats.dma_map_errors++;
                 queue_head_inc(txq);
         }
         return 0;
@@ -1877,7 +1878,7 @@ static void be_post_rx_frags(struct be_rx_obj *rxo, gfp_t gfp)
                         if (dma_mapping_error(dev, page_dmaaddr)) {
                                 put_page(pagep);
                                 pagep = NULL;
-                                rx_stats(rxo)->rx_post_fail++;
+                                adapter->drv_stats.dma_map_errors++;
                                 break;
                         }
                         page_offset = 0;