netdev - [RFC PATCH 0/2] net: arc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1405871098-5663-1-git-send-email-b.galvani@gmail.com>
Date:	Sun, 20 Jul 2014 17:44:56 +0200
From:	Beniamino Galvani <b.galvani@...il.com>
To:	netdev@...r.kernel.org
Cc:	Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
	Vineet Gupta <Vineet.Gupta1@...opsys.com>,
	Heiko Stübner <heiko@...ech.de>,
	Max Schwarz <max.schwarz@...ine.de>,
	Florian Fainelli <f.fainelli@...il.com>,
	Wei Yongjun <yongjun_wei@...ndmicro.com.cn>,
	Thierry Reding <thierry.reding@...il.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	linux-kernel@...r.kernel.org,
	Beniamino Galvani <b.galvani@...il.com>
Subject: [RFC PATCH 0/2] net: arc_emac: fix tx issues

Hi,

I've found a strange behaviour of the ARC EMAC driver while doing some
tests on a Rockchip based Radxa Rock board and the following patches
are a try to solve the problem. I'm not sure if they are correct or if
there's a better way to do the same thing, so I'd like to receive some
feedback on this.

The problem I'm facing is that the transmission of a UDP stream from
the device stops immediately with the socket send buffer full and this
seems due to the current implementation of tx reclaiming.

With the two patches below, which do the following:

 - enable tx interrupts, which are used to trigger a napi poll and
   thus a clean of tx ring
 - fix a possible race between xmit and tx clean

everything seems to work properly.

Any comments are welcome,
Beniamino

Beniamino Galvani (2):
  net: arc_emac: enable tx interrupts
  net: arc_emac: prevent reuse of unreclaimed tx descriptors

 drivers/net/ethernet/arc/emac_main.c |   56 +++++++++++++++++++++++-----------
 1 file changed, 38 insertions(+), 18 deletions(-)

-- 
1.7.10.4

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html