linux-kernel - RE: [PATCH net] r8152: Fix broken RX checksums.

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Date:   Thu, 3 Nov 2016 08:56:30 +0000
From:   Hayes Wang <hayeswang@...ltek.com>
To:     Mark Lord <mlord@...ox.com>, David Miller <davem@...emloft.net>
CC:     nic_swsd <nic_swsd@...ltek.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH net] r8152: Fix broken RX checksums.

Mark Lord [mailto:mlord@...ox.com]
> Sent: Thursday, November 03, 2016 2:30 AM
> To: Hayes Wang; David Miller
[...]
> I have poked at it some more, and thus far it appears that it is
> only necessary to disable TCP rx checksums.  The system doesn't crash
> when only IP/UDP checksums are enabled, but does when TCP checksums are on.
> 
> This happens regardless of whether RX_AGG is disabled or enabled,
> and increasing/decreasing the number of RX URBs (RTL8152_MAX_RX)
> doesn't seem to affect it.

I test Raspberry Pi v1, but I couldn't boot with NFSROOT through
both onboard nic and RTL8152. I get following error.

   VFS: Unable to mount root fs via NFS, trying floppy.
   Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(2,0)

However, if I start the system without NFSROOT, I could mount the nfs fs.
Any idea?

NFS server: Fedora 24
Raspberry Pi OS: 2016-09-23-raspbian-jessie

Content of /etc/exports:

   /nfsexport *(rw,sync,no_root_squash)

I change the cmdline.txt from

   dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1
   root=/dev/mmcblk0p2 rootfstype=ext4 elevator=deadline
   fsck.repair=yes rootwait quiet splash plymouth.ignore-serial-consoles

to

   dwc_otg.lpm_enable=0 console=serial0,115200 console=tty1
   root=/dev/nfs nfsroot=192.168.94.2:/nfsexport ip=192.168.94.22
   rw rootwait quiet splash plymouth.ignore-serial-consoles

Best Regards,
Hayes