CVS commit: src/sys/dev/pci

["Brian Buhrow" <buhrow%netbsd.org@localhost>]

Module Name:    src
Committed By:   buhrow
Date:           Mon Apr 18 22:05:39 UTC 2011

Modified Files:
        src/sys/dev/pci: if_bge.c

Log Message:
Fixes for kern/40018.

        Our driver initializes the Broadcom hardware to peform a tcp and udp
checksum on only the payload of the tcp or udp packet, rather than the
entire packet.  The FreeBSD, OpenBSD  and Linux drivers instruct the hardware 
to compute
the checksum for the entire packet.  I believe the bug is that some revisions
of the BCM hardware, under certain circumstances, revert to doing the
complete checksum calculation, as the FreeBSD, OpenBSD  and Linux drivers
request, while things are running. As
a result, when we pull the computed checksum from the hardware and pass it
up to the upper layers, we assume the checksum is the more minimal
one, and the upper layers perform the appropriate checks, which, when this
happens, cause the packet to be rejected because the resultant checksum is
decidedly incorrect.
        This patch changes the driver to instruct the hardware to perform the
checksum over the entire packet, just as the FreeBSD, OpenBSD  and
Linux drivers do, and to notify the upper layers appropriately.

This patch appears to work on all revisions of the hardware that have been
tested.  (See the list in the bug report.)

this patch is approved by tls.


To generate a diff of this commit:
cvs rdiff -u -r1.193 -r1.194 src/sys/dev/pci/if_bge.c

Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.