netdev - Re: rtl8150: use default MTU of 1500

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Date:	Thu, 31 Jan 2008 17:05:01 +0100
From:	Lennert Buytenhek <buytenh@...tstofly.org>
To:	Petko Manolov <petkan@...leusys.com>
Cc:	netdev@...r.kernel.org, jgarzik@...ox.com
Subject: Re: rtl8150: use default MTU of 1500

On Thu, Jan 31, 2008 at 05:42:34PM +0200, Petko Manolov wrote:

> > The RTL8150 driver uses an MTU of 1540 by default, which causes a
> > bunch of problems -- it prevents booting from NFS root, for one.
> 
> Agreed, although it is a bit strange how this particular bug has
> sneaked up for so long...

I posted this patch sometime in 2006, and you asked me a question
about it then (why we don't just set RTL8150_MTU to 1500 -- the
answer would be that RTL8150_MTU is used in a couple more places
in the driver, including for allocing skbuffs), but I failed to
follow up to that question at the time, which is why I assume it got
dropped.

I have been carrying the patch in my own tree since then, and only
noticed recently that the patch never made it upstream.


cheers,
Lennert


> >Signed-off-by: Lennert Buytenhek <buytenh@...tstofly.org>
> >Cc: Petko Manolov <petkan@...leusys.com>
> >
> >--- linux-2.6.24-git7.orig/drivers/net/usb/rtl8150.c	2008-01-24 
> >23:58:37.000000000 +0100
> >+++ linux-2.6.24-git7/drivers/net/usb/rtl8150.c	2008-01-30 
> >20:29:00.000000000 +0100
> >@@ -925,9 +925,8 @@
> >	netdev->hard_start_xmit = rtl8150_start_xmit;
> >	netdev->set_multicast_list = rtl8150_set_multicast;
> >	netdev->set_mac_address = rtl8150_set_mac_address;
> >	netdev->get_stats = rtl8150_netdev_stats;
> >-	netdev->mtu = RTL8150_MTU;
> >	SET_ETHTOOL_OPS(netdev, &ops);
> >	dev->intr_interval = 100;	/* 100ms */
> >
> >	if (!alloc_all_urbs(dev)) {
> >
--
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