From: Michael Shteinbok <michael.shteinbok@cavium.com>
Date: Thu, 29 Nov 2018 10:50:19 +0200
Subject: qede - Add a statistic for a case where driver drops tx packet due to
 memory allocation failure.
Patch-mainline: v5.0-rc1
Git-commit: dcc6abae0f473a67543ce651fbfb6b15452876f6
References: bsc#1104393 FATE#325891 bsc#1104389 FATE#325890

skb_linearization can fail due to memory allocation failure.
In such a case, the driver will drop the packet. In such a case
The driver used to print an error message.
This patch replaces this error message by a dedicated statistic.

Signed-off-by: Michael Shteinbok <michael.shteinbok@cavium.com>
Signed-off-by: Ariel Elior <ariel.elior@cavium.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/net/ethernet/qlogic/qede/qede.h         |    1 +
 drivers/net/ethernet/qlogic/qede/qede_ethtool.c |    1 +
 drivers/net/ethernet/qlogic/qede/qede_fp.c      |    4 ++--
 3 files changed, 4 insertions(+), 2 deletions(-)

--- a/drivers/net/ethernet/qlogic/qede/qede.h
+++ b/drivers/net/ethernet/qlogic/qede/qede.h
@@ -381,6 +381,7 @@ struct qede_tx_queue {
 
 	u64 xmit_pkts;
 	u64 stopped_cnt;
+	u64 tx_mem_alloc_err;
 
 	__le16 *hw_cons_ptr;
 
--- a/drivers/net/ethernet/qlogic/qede/qede_ethtool.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_ethtool.c
@@ -73,6 +73,7 @@ static const struct {
 } qede_tqstats_arr[] = {
 	QEDE_TQSTAT(xmit_pkts),
 	QEDE_TQSTAT(stopped_cnt),
+	QEDE_TQSTAT(tx_mem_alloc_err),
 };
 
 #define QEDE_STAT_OFFSET(stat_name, type, base) \
--- a/drivers/net/ethernet/qlogic/qede/qede_fp.c
+++ b/drivers/net/ethernet/qlogic/qede/qede_fp.c
@@ -1466,8 +1466,8 @@ netdev_tx_t qede_start_xmit(struct sk_bu
 #if ((MAX_SKB_FRAGS + 2) > ETH_TX_MAX_BDS_PER_NON_LSO_PACKET)
 	if (qede_pkt_req_lin(skb, xmit_type)) {
 		if (skb_linearize(skb)) {
-			DP_NOTICE(edev,
-				  "SKB linearization failed - silently dropping this SKB\n");
+			txq->tx_mem_alloc_err++;
+
 			dev_kfree_skb_any(skb);
 			return NETDEV_TX_OK;
 		}