From: Joe Perches <joe@perches.com>
To: Matt Carlson <mcarlson@broadcom.com>,
Michael Chan <mchan@broadcom.com>,
Benjamin Li <benli@broadcom.com>
Cc: "David S. Miller" <davem@davemloft.net>,
netdev <netdev@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>
Subject: [RFC PATCH] drivers/net/tg3.c: Raise Jumbo Frame MTU to 9216?
Date: Wed, 15 Sep 2010 10:41:56 -0700 [thread overview]
Message-ID: <1284572516.10223.12.camel@Joe-Laptop> (raw)
The TG3 apparently supports 9K frame sizes.
http://www.broadcom.com/collateral/pb/5704C-PB05-R.pdf
Is exactly 9000 a hardware limit?
Should the jumbo frame MTU be raised to 9216 or 9216
less the size of MAC, VLAN, IP and TCP headers?
diff --git a/drivers/net/tg3.c b/drivers/net/tg3.c
index 9f6ffff..3727070 100644
--- a/drivers/net/tg3.c
+++ b/drivers/net/tg3.c
@@ -95,7 +95,7 @@
/* hardware minimum and maximum for a single frame's data payload */
#define TG3_MIN_MTU 60
#define TG3_MAX_MTU(tp) \
- ((tp->tg3_flags & TG3_FLAG_JUMBO_CAPABLE) ? 9000 : 1500)
+ ((tp->tg3_flags & TG3_FLAG_JUMBO_CAPABLE) ? 9216 : 1500)
/* These numbers seem to be hard coded in the NIC firmware somehow.
* You can't change the ring sizes, but you can change where you place
next reply other threads:[~2010-09-15 17:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-15 17:41 Joe Perches [this message]
2010-09-15 17:57 ` [RFC PATCH] drivers/net/tg3.c: Raise Jumbo Frame MTU to 9216? Michael Chan
2010-09-15 19:14 ` Joe Perches
2010-09-15 19:31 ` Ben Hutchings
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