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Date: Tue, 14 Aug 2012 23:25:53 +0200
From: Luigi Rizzo <rizzo@iet.unipi.it>
To: Nikolay Denev <ndenev@gmail.com>
Message-ID: <20120814212553.GA34207@onelab2.iet.unipi.it>
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Cc: net@freebsd.org
Subject: Re: ipfw meets netmap (6.5 Mpps in userspace)
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On Tue, Aug 14, 2012 at 10:53:38PM +0300, Nikolay Denev wrote:
> On Aug 13, 2012, at 2:17 PM, Luigi Rizzo <rizzo@iet.unipi.it> wrote:
...
> Hi Luigi,
> 
> I've tried copying netmap sources from HEAD to the latest RELENG_9 branch, but running
> kipfw with two VALE interfaces produced immediate kernel panic (transcribed by hand, possible typos):

i suspect kernel and userland headers out of sync, causing
some ioctl() to be called with invalid parameters
(and perhaps a missing check in the kernel does the rest,
otherwise of course the kernel should not crash).

Please make sure you also update net/netmap*.h

FWIW, i tested the code in RELENG_9 on my workstation.

cheers
luigi

> Fatal trap 12: page fault while in kernel mode
> cpuid = 1; apic id = 01
> fault virtual address		= 0x28
> fault code			= supervisor read data, page not present
> instruction pointer		= 0x20:0xffffffff808274da
> stack pointer			= 0x28:0xffffff88df1a5530
> frame pointer			= 0x28:0xffffff88df1a5550
> code segment		= base 0x0, limit 0xfffff, type 0x1b
> 				= DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags		= interrupt enabled, resume, IOPL = 0
> current process		= 2349 (kipfw)
> [ thread pid 2349 tid 100612 ]
> Stopped at		ifunit_ref+0x2a:
> db> bt
> Tracing pid 2349 tid 100612 td 0xfffffe0094fd1000
> ifunit_ref() at ifunit_ref+0x2a
> ifioctl() at ifioctl+0x1cd
> netmap_ioctl() at netmap_ioctl+0x121
> devfs_ioctl_f() at devfs_ioctl_f+0x7b
> kern_ioctl() at kern_ioctl+0x115
> sys_ioctl() at sys_ioctl+0xfd
> amd64_syscall() at amd64_syscall+0x5ea
> Xfast_syscall() at Xfast_syscall+0xf7
> --- syscall (54, FreeBSD ELF64, sys_ioctl), rip = 0x800b5eaec, rsp = 0x7fffffffd
> 888, rbp = 0xc0206911 ---
> 
> 
> 
> Anyways, many thanks for you great work on NETMAP and not the super cool user-space IPFW!
> 
> Cheers,
> Nikolay