From: Ben Hutchings <bhutchings@solarflare.com>
To: Eilon Greenstein <eilong@broadcom.com>
Cc: David Miller <davem@davemloft.net>,
netdev <netdev@vger.kernel.org>,
Michael Chan <mchan@broadcom.com>,
Vladislav Zolotarov <vladz@broadcom.com>
Subject: Re: [PATCH net-next 11/15]bnx2x: Add TPA, Broadcoms HW LRO
Date: Tue, 17 Jun 2008 16:05:40 +0100 [thread overview]
Message-ID: <20080617150539.GJ5350@solarflare.com> (raw)
In-Reply-To: <1213714166.5817.181.camel@lb-tlvb-eliezer>
Eilon Greenstein wrote:
> The TPA stands for Transparent Packet Aggregation. When enabled, the FW
> aggregate in-order TCP packets according to the 4-tuple match and sends
> 1 big packet to the driver. This packet is stored on an SGL in which
> each SGE is 1 page. The FW also implements a timeout algorithm and it
> honors all TCP flag, including the push flag as a trigger to halt
> aggregation.
[...]
LRO is not compatible with forwarding and will currently trigger a BUG() or
WARN() if used on packets that are then forwarded. I am about to post a
fix for that which will automatically disable LRO as necessary, but it
depends on drivers behaving properly.
TPA needs to be controllable per-device through the ethtool set_flags()
operation and should be visible in the device feature flags as NETIF_F_LRO
(and through get_flags()).
Ben.
--
Ben Hutchings, Senior Software Engineer, Solarflare Communications
Not speaking for my employer; that's the marketing department's job.
next prev parent reply other threads:[~2008-06-17 15:05 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-17 14:49 [PATCH net-next 11/15]bnx2x: Add TPA, Broadcoms HW LRO Eilon Greenstein
2008-06-17 15:05 ` Ben Hutchings [this message]
2008-06-17 15:17 ` Ben Hutchings
2008-06-17 23:16 ` David Miller
2008-06-19 17:42 ` Eilon Greenstein
2008-06-19 18:20 ` Ben Hutchings
2008-06-19 21:50 ` David Miller
-- strict thread matches above, loose matches on Subject: below --
2008-06-23 16:02 Eilon Greenstein
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