netdev - Re: [PATCH] net: forcedeth: add xmit

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Message-ID: <20191018154844.34a27c64@cakuba.netronome.com>
Date:   Fri, 18 Oct 2019 15:48:44 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Zhu Yanjun <yanjun.zhu@...cle.com>
Cc:     rain.1986.08.12@...il.com, davem@...emloft.net,
        netdev@...r.kernel.org
Subject: Re: [PATCH] net: forcedeth: add xmit_more support

On Fri, 18 Oct 2019 06:01:25 -0400, Zhu Yanjun wrote:
> This change adds support for xmit_more based on the igb commit 6f19e12f6230
> ("igb: flush when in xmit_more mode and under descriptor pressure") and
> commit 6b16f9ee89b8 ("net: move skb->xmit_more hint to softnet data") that
> were made to igb to support this feature. The function netif_xmit_stopped
> is called to check if transmit queue on device is currently unable to send
> to determine if we must write the tail because we can add no further
> buffers.
> When normal packets and/or xmit_more packets fill up tx_desc, it is
> necessary to trigger NIC tx reg.

Looks broken. You gotta make sure you check the kick on _every_ return
path. There are 4 return statements in each function, you only touched
2.

Also the labels should be lower case.