Date: Mon, 14 Dec 2009 19:08:11 +0000 (UTC) From: Pyun YongHyeon <yongari@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/dev/vge if_vge.c Message-ID: <200912141908.nBEJ8Wh5043188@repoman.freebsd.org>
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yongari 2009-12-14 19:08:11 UTC
FreeBSD src repository
Modified files:
sys/dev/vge if_vge.c
Log:
SVN rev 200529 on 2009-12-14 19:08:11Z by yongari
Clear VGE_TXDESC_Q bit for transmitted frames. The VGE_TXDESC_Q bit
seems to work like a tag that indicates 'not list end' of queued
frames. Without having a VGE_TXDESC_Q bit indicates 'list end'. So
the last frame of multiple queued frames has no VGE_TXDESC_Q bit.
The hardware has peculiar behavior for VGE_TXDESC_Q bit handling.
If the VGE_TXDESC_Q bit of descriptor was set the controller would
fetch next descriptor. However if next descriptor's OWN bit was
cleared but VGE_TXDESC_Q was set, it could confuse controller.
Clearing VGE_TXDESC_Q bit for transmitted frames ensure correct
behavior.
Revision Changes Path
1.48 +4 -1 src/sys/dev/vge/if_vge.c
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