Re: kern/52876: The vlan(4) over wm(4) behaves something strange

[clare%csel.org@localhost]

The following reply was made to PR kern/52876; it has been noted by GNATS.

From: clare%csel.org@localhost
To: gnats-bugs%NetBSD.org@localhost
Cc: 
Subject: Re: kern/52876: The vlan(4) over wm(4) behaves something strange
Date: Mon, 1 Jan 2018 18:03:14 +0900

 Transmitter DMA was seems to be halted on such packets.
 It was not detected by the wm(4) watchdog logics.
 
 I installed WM_DEBUG and WM_DEBUG_TX enabled kernel,
 took a debug log, and placed as following URL:
 
 https://www.csel.org/netbsd/pr/52876/wm-debug-tx-20180101.txt
 
 How to repeat:
 * setup Intel i82583V.
 * setup wm(4) driver with all hardware offload flags.
 * setup vlan(4) driver attached to the wm(4) and
   enable hardware offload flags including TSO.
 * connect to sshd via vlan(4) and apply large traffic
   (doing cat /var/log/messages is sufficient).
 
 How to workaround:
 * disabling TSO on vlan(4) is sufficient.
 
 
 -- 
 Shinichi Doyashiki <clare%csel.org@localhost>