linux-kernel - sending TCP/IP packet based on NIC MTU size

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Date:	Wed, 8 Oct 2008 03:41:41 -0700 (PDT)
From:	Parav Pandit <paravpandit@...oo.com>
To:	Linux kernel <linux-kernel@...r.kernel.org>
Subject: sending TCP/IP packet based on NIC MTU size

Hi,

I am searching Linux kernel TCP/IP code which does following functionality.

TCP/IP stack needs to check that - 
how many bytes of a TCP stream it can send to NIC driver.

Can anybody point me where this check in performed?
Like if MTU size is set to 1500 for a NIC and VLAN is not set then it will send 1492 bytes. 
If VLAN is set then it will send 1398 bytes to NIC.

Regards,
Parav Pandit

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