From: Stefan Richter <stefanr@s5r6.in-berlin.de>
To: Jarod Wilson <jarod@redhat.com>
Cc: Sabrina Dubroca <sd@queasysnail.net>,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
Faisal Latif <faisal.latif@intel.com>,
linux-rdma@vger.kernel.org, Cliff Whickman <cpw@sgi.com>,
Robin Holt <robinmholt@gmail.com>,
Jes Sorensen <jes@trained-monkey.org>,
Marek Lindner <mareklindner@neomailbox.ch>,
Simon Wunderlich <sw@simonwunderlich.de>,
Antonio Quartulli <a@unstable.cc>
Subject: Re: [PATCH net-next 6/6] net: use core MTU range checking in misc drivers
Date: Sat, 22 Oct 2016 20:51:57 +0200 [thread overview]
Message-ID: <20161022205157.0b89a013@kant> (raw)
In-Reply-To: <20161022113607.55832988@kant>
On Oct 22 Stefan Richter wrote:
> On Oct 19 Jarod Wilson wrote:
> > On Thu, Oct 20, 2016 at 12:38:46AM +0200, Stefan Richter wrote:
> > > On Oct 19 Sabrina Dubroca wrote:
> > > > 2016-10-18, 22:33:33 -0400, Jarod Wilson wrote:
[...]
> > > > > @@ -1481,6 +1471,8 @@ static int fwnet_probe(struct fw_unit *unit,
> > > > > max_mtu = (1 << (card->max_receive + 1))
> > > > > - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE;
> > > > > net->mtu = min(1500U, max_mtu);
> > > > > + net->min_mtu = ETH_MIN_MTU;
> > > > > + net->max_mtu = net->mtu;
> > > >
> > > > But that will now prevent increasing the MTU above the initial value?
> > >
> > > Indeed, therefore NAK.
> >
> > However, there's an explicit calculation for 'max_mtu' right there that I
> > glazed right over. It would seem perhaps *that* should be used for
> > net->max_mtu here, no?
>
> No. This 'max_mtu' here is not the absolute maximum. It is only an
> initial MTU which has the property that link fragmentation is not
> going to happen (if all other peers will at least as capable as this
> node).
Besides, card->max_receive is about what the card can receive (at the IEEE
1394 link layer), not about what the card can send.
--
Stefan Richter
-======----- =-=- =-==-
http://arcgraph.de/sr/
next prev parent reply other threads:[~2016-10-22 18:51 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-19 2:33 [PATCH net-next 0/6] net: use core MTU range checking everywhere Jarod Wilson
2016-10-19 2:33 ` [PATCH net-next 1/6] net: use core MTU range checking in USB NIC drivers Jarod Wilson
2016-10-19 2:33 ` [PATCH net-next 2/6] net: use core MTU range checking in wireless drivers Jarod Wilson
2016-10-19 7:38 ` Johannes Berg
2016-10-19 14:27 ` Jarod Wilson
2016-10-19 14:28 ` Johannes Berg
2016-10-19 2:33 ` [PATCH net-next 3/6] net: use core MTU range checking in WAN drivers Jarod Wilson
2016-10-21 12:04 ` Krzysztof Hałasa
2016-10-19 2:33 ` [PATCH net-next 4/6] net: use core MTU range checking in core net infra Jarod Wilson
2016-10-19 12:17 ` Jiri Benc
2016-10-19 14:51 ` Jarod Wilson
2016-10-19 13:55 ` Sabrina Dubroca
2016-10-19 14:40 ` Jarod Wilson
2016-10-19 15:28 ` Sabrina Dubroca
2016-10-19 15:46 ` Jarod Wilson
2016-10-19 2:33 ` [PATCH net-next 5/6] net: use core MTU range checking in virt drivers Jarod Wilson
2016-10-19 2:33 ` Jarod Wilson
2016-10-19 13:06 ` Aaron Conole
2016-10-19 13:06 ` Aaron Conole
2016-10-19 13:59 ` Michael S. Tsirkin
2016-10-19 13:59 ` Michael S. Tsirkin
2016-10-19 14:03 ` Michael S. Tsirkin
2016-10-19 14:03 ` Michael S. Tsirkin
2016-10-19 14:17 ` Jarod Wilson
2016-10-19 14:17 ` Jarod Wilson
2016-10-19 14:15 ` Jarod Wilson
2016-10-19 14:15 ` Jarod Wilson
2016-10-19 14:07 ` Haiyang Zhang via Virtualization
2016-10-19 14:07 ` Haiyang Zhang
2016-10-19 14:23 ` Jarod Wilson
2016-10-19 14:23 ` Jarod Wilson
2016-10-19 22:21 ` Shrikrishna Khare
2016-10-19 22:21 ` Shrikrishna Khare
2016-10-19 2:33 ` [PATCH net-next 6/6] net: use core MTU range checking in misc drivers Jarod Wilson
2016-10-19 14:37 ` Robin Holt
2016-10-19 16:05 ` Sabrina Dubroca
2016-10-19 22:38 ` Stefan Richter
2016-10-20 3:16 ` Jarod Wilson
[not found] ` <20161020031641.GJ18569-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-10-22 9:36 ` Stefan Richter
2016-10-22 9:36 ` Stefan Richter
2016-10-22 18:51 ` Stefan Richter [this message]
2016-10-19 19:10 ` [PATCH net-next 0/6] net: use core MTU range checking everywhere David Miller
2016-10-19 19:29 ` Jarod Wilson
2016-10-20 17:55 ` [PATCH net-next v2 0/9] " Jarod Wilson
2016-10-20 17:55 ` [PATCH net-next v2 1/9] ethernet: use net core MTU range checking in more drivers Jarod Wilson
2016-10-20 17:55 ` Jarod Wilson
2016-10-20 17:55 ` [PATCH net-next v2 2/9] net: use core MTU range checking in USB NIC drivers Jarod Wilson
2016-10-20 17:55 ` [PATCH net-next v2 3/9] net: use core MTU range checking in wireless drivers Jarod Wilson
2016-10-20 18:22 ` Johannes Berg
2016-10-20 18:38 ` David Miller
2016-10-20 17:55 ` [PATCH net-next v2 4/9] net: use core MTU range checking in WAN drivers Jarod Wilson
2016-10-20 17:55 ` [PATCH net-next v2 5/9] net: use core MTU range checking in core net infra Jarod Wilson
2016-10-20 17:55 ` [PATCH net-next v2 6/9] net: use core MTU range checking in virt drivers Jarod Wilson
2016-10-20 17:55 ` Jarod Wilson
2016-10-20 18:05 ` Haiyang Zhang
2016-10-20 20:12 ` Kershner, David A
2016-10-20 18:05 ` Haiyang Zhang via Virtualization
2016-10-20 20:23 ` Michael S. Tsirkin
2016-10-20 20:23 ` Michael S. Tsirkin
2016-10-21 2:37 ` Jarod Wilson
2016-10-21 2:37 ` Jarod Wilson
2016-10-21 3:36 ` Michael S. Tsirkin
2016-10-21 3:36 ` Michael S. Tsirkin
2016-10-21 13:24 ` Aaron Conole
2016-10-21 13:24 ` Aaron Conole
2016-10-21 10:09 ` Wei Liu
2016-10-21 10:09 ` Wei Liu
2016-10-20 17:55 ` [PATCH net-next v2 7/9] net: use core MTU range checking in misc drivers Jarod Wilson
2016-10-21 6:52 ` Rémi Denis-Courmont
2016-10-21 16:22 ` Sebastian Reichel
[not found] ` <20161020175524.6184-8-jarod-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-10-22 7:17 ` [net-next,v2,7/9] " Sven Eckelmann
2016-10-22 7:17 ` Sven Eckelmann
2016-10-22 19:16 ` [PATCH net-next v2 7/9] " Stefan Richter
2016-10-22 19:27 ` Stefan Richter
2016-10-23 1:18 ` Jarod Wilson
2016-10-23 14:29 ` [PATCH net-next 1/2] firewire: net: fix maximum possible MTU Stefan Richter
2016-10-23 14:30 ` [PATCH net-next 2/2] firewire: net: set initial MTU = 1500 unconditionally, fix IPv6 on some CardBus cards Stefan Richter
2016-10-23 14:30 ` Stefan Richter
2016-10-24 1:50 ` Jarod Wilson
2016-10-24 12:26 ` [PATCH net-next 2/2 v2] " Stefan Richter
2016-10-24 12:26 ` Stefan Richter
2016-10-25 3:05 ` Jarod Wilson
2016-10-26 21:29 ` [PATCH net-next 2/2] " David Miller
2016-10-26 21:29 ` David Miller
2016-10-29 20:16 ` [PATCH net-next] firewire: net: really fix maximum possible MTU Stefan Richter
2016-10-30 3:01 ` David Miller
2016-10-24 1:50 ` [PATCH net-next 1/2] firewire: net: " Jarod Wilson
2016-10-26 21:29 ` David Miller
2016-10-26 21:29 ` David Miller
2016-10-20 17:55 ` [PATCH net-next v2 8/9] s390/net: use net core MTU range checking Jarod Wilson
2016-10-20 17:55 ` [PATCH net-next v2 9/9] ipv4/6: use core net " Jarod Wilson
2016-10-20 18:53 ` [PATCH net-next v2 0/9] net: use core MTU range checking everywhere David Miller
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