Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756347AbcJWO31 (ORCPT ); Sun, 23 Oct 2016 10:29:27 -0400 Received: from einhorn.in-berlin.de ([192.109.42.8]:56343 "EHLO einhorn.in-berlin.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754427AbcJWO3Y (ORCPT ); Sun, 23 Oct 2016 10:29:24 -0400 X-Envelope-From: stefanr@s5r6.in-berlin.de Date: Sun, 23 Oct 2016 16:29:03 +0200 From: Stefan Richter To: "David S. Miller" Cc: netdev@vger.kernel.org, linux1394-devel@lists.sourceforge.net, Jarod Wilson , linux-kernel@vger.kernel.org Subject: [PATCH net-next 1/2] firewire: net: fix maximum possible MTU Message-ID: <20161023162903.4166a35d@kant> In-Reply-To: <20161023011824.GE32569@redhat.com> References: <20161019023333.15760-1-jarod@redhat.com> <20161020175524.6184-1-jarod@redhat.com> <20161020175524.6184-8-jarod@redhat.com> <20161022211606.3b5d137d@kant> <20161022212759.228c7642@kant> <20161023011824.GE32569@redhat.com> X-Mailer: Claws Mail 3.13.2 (GTK+ 2.24.31; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1683 Lines: 43 Commit b3e3893e1253 ("net: use core MTU range checking in misc drivers") mistakenly introduced an upper limit for firewire-net's MTU based on the local link layer controller's reception capability. Revert this. Neither RFC 2734 nor our implementation impose any particular upper limit. Actually, to be on the safe side and to make the code explicit, set ETH_MAX_MTU = 65535 as upper limit now. (I replaced sizeof(struct rfc2734_header) by the equivalent RFC2374_FRAG_HDR_SIZE in order to avoid distracting long/int conversions.) Fixes: b3e3893e1253('net: use core MTU range checking in misc drivers') CC: netdev@vger.kernel.org CC: linux1394-devel@lists.sourceforge.net CC: Jarod Wilson Signed-off-by: Stefan Richter --- drivers/firewire/net.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/firewire/net.c b/drivers/firewire/net.c index 8430222151fc..99379542b263 100644 --- a/drivers/firewire/net.c +++ b/drivers/firewire/net.c @@ -1467,10 +1467,11 @@ static int fwnet_probe(struct fw_unit *unit, * Use the RFC 2734 default 1500 octets or the maximum payload * as initial MTU */ - net->max_mtu = (1 << (card->max_receive + 1)) - - sizeof(struct rfc2734_header) - IEEE1394_GASP_HDR_SIZE; - net->mtu = min(1500U, net->max_mtu); + net->mtu = min(1500U, + (1U << (card->max_receive + 1)) + - RFC2374_FRAG_HDR_SIZE - IEEE1394_GASP_HDR_SIZE); net->min_mtu = ETH_MIN_MTU; + net->max_mtu = ETH_MAX_MTU; /* Set our hardware address while we're at it */ ha = (union fwnet_hwaddr *)net->dev_addr; -- Stefan Richter -======----- =-=- =-=== http://arcgraph.de/sr/