linux-kernel - [Doubt on Implict BUGs caused LRO] doubt about lro status in v3.12 of torvalds/linux.git

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Message-ID: <CAJULonje7V_sMt6joBBsM3uuQkYFhfNK70BXzN0EyS3sQNb0uQ@mail.gmail.com>
Date:	Fri, 22 Nov 2013 23:00:50 +0800
From:	Yanfei Wang <backyes@...il.com>
To:	netdev <netdev@...r.kernel.org>,
	China Kernel <kernel@...r.linux-kernel.cn>,
	linux-kernel@...r.kernel.org
Subject: [Doubt on Implict BUGs caused LRO] doubt about lro status in v3.12 of torvalds/linux.git

Hi,

Compared to the earlier kernel version, I found that Large receive
offload(LRO) is obsolete in latest kernel, and that is verified from
other materials about Generic receive offload(GRO).

However,  I also found some LRO header files and  lro-related
functions referred by some drivers, and the lro-related function
definition is already removed at the same time!

TEST steps:
1. my git local db config as follow, url =
http://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
2. git checkout v3.12 -b 3.12
3. cd net/ipv4,
 [backyes@f14 ipv4]$ cat Makefile | grep lro
obj-$(CONFIG_INET_LRO) += inet_lro.o
[backyes@f14 ipv4]$ ls inet_*
inet_connection_sock.c  inet_diag.c  inet_fragment.c
inet_hashtables.c  inet_timewait_sock.c
[backyes@f14 ipv4]$
Here, Makefile has inet_lro.o config, while the inet_lro.c is removed.
4. lro functions referred by some drivers, as follow,
[backyes@f14 linux]$ grep "inet_lro" * -r
drivers/net/ethernet/pasemi/pasemi_mac.c:#include <linux/inet_lro.h>
drivers/net/ethernet/pasemi/pasemi_mac_ethtool.c:#include <linux/inet_lro.h>
drivers/infiniband/hw/nes/nes_hw.c:#include <linux/inet_lro.h>
drivers/infiniband/hw/nes/nes_hw.h:#include <linux/inet_lro.h>
include/linux/inet_lro.h: *  linux/include/linux/inet_lro.h
net/ipv4/Makefile:obj-$(CONFIG_INET_LRO) += inet_lro.o

so, I understand that the removal of LRO is not clean, which will
cause compiler error for some kernel config.

--
Best Regard!

Yanfei Wang
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