netdev - net: macb: lack of statistics

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Message-ID: <61FA15C5AEE1ED4E827ADEB50820C1443EBD111650@MAIL03.corp.lgcns.com>
Date:   Wed, 1 Feb 2017 14:10:19 +0900
From:   Hyung Jin Jung <realbright@...ns.com>
To:     "nicolas.ferre@...el.com" <nicolas.ferre@...el.com>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: net: macb: lack of statistics - tx_dropped

macb doesn't maintain statistics of dropped packets when transmitting.
so that it's not possible to detect packet loss in user space (sysfs, procfs...)

macb_start_xmit should to increase tx_dropped in case of exception - buffer full, dma mapping fail

Davy