Date: Tue, 9 Feb 1999 15:18:26 -0500 (EST) From: Larry Lile <lile@stdio.com> To: Julian Elischer <julian@whistle.com> Cc: hackers@FreeBSD.ORG Subject: Re: Why did this panic? Message-ID: <Pine.BSF.4.05.9902091456290.14147-200000@heathers.stdio.com> In-Reply-To: <Pine.BSF.3.95.990209113256.5802E-100000@current1.whistle.com>
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Content-Type: TEXT/PLAIN; charset=US-ASCII
Oops, too much buffer size math, I should add the following between
1248 & 1249:
mbuf_size -= 2;
I guess that could explain the panic. I wonder why I don't see it
with smaller mtu's? I guess I probably wrote off the end of one
mbuf into the beggining of a mbuf cluster and ate the free list
pointer.
Yes, consider me suitably embarrased, I was in a hurry when I
globbed that 3-way min together.
Thanks for pointing out my math error! I am not very happy with
all of that code to begin with, do you have any suggestions on
how to make it more elegant? I do intend at some point to try just
linking the raw receive buffers to m_ext and setting the free
routine to a routine in the driver to avoid the unnecesary copies.
Heres a new cut.
Larry Lile
lile@stdio.com
On Tue, 9 Feb 1999, Julian Elischer wrote:
>
>
>
>
> in line 1248,
> subtract 2 from buf_size as well
>
> 1245 m0->m_pkthdr.rcvif = &sc->arpcom.ac_if;
> 1246 m0->m_pkthdr.len = ByteCount;
> 1247 m0->m_len = 0;
> 1248 m0->m_data += 2;
> 1249 th = mtod(m0, struct iso88025_header *);
>
>
> in 1255 you overwrite what you just calculated the line before..
> have you already set up the variables used?
> (looks like you have..)
> ah it's a 3 way min()
>
> use a MIN macro please..
> #define MIN(A,B) (((A) < (B)) ? (A) : (B))
> length = MIN( frame_len,
> MIN( (RX_BUFFER_LEN - frag_offset),
> (mbuf_size - mbuf_offset))
>
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