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gem_start() pads a Tx packet to the minimum ethernet frame length

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by adding a segment to the Tx chain.  That entails using one more
descriptor.  It did not synchronize the last descriptor.

In gem_start(), clarify and repair DMA synchronization of the Tx
descriptors.  Sync them all.
This commit is contained in:
dyoung 2007-12-31 20:54:41 +00:00
parent 7b9a3d09d5
commit 2b99c93d85
1 changed files with 3 additions and 3 deletions
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6
sys/dev/ic/gem.c
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@ -1,4 +1,4 @@
/* $NetBSD: gem.c,v 1.64 2007/12/31 20:39:45 dyoung Exp $ */
/* $NetBSD: gem.c,v 1.65 2007/12/31 20:54:41 dyoung Exp $ */
/*
*
@ -34,7 +34,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: gem.c,v 1.64 2007/12/31 20:39:45 dyoung Exp $");
__KERNEL_RCSID(0, "$NetBSD: gem.c,v 1.65 2007/12/31 20:54:41 dyoung Exp $");
#include "opt_inet.h"
#include "bpfilter.h"
@ -1251,7 +1251,7 @@ gem_start(ifp)
#endif
/* Sync the descriptors we're using. */
GEM_CDTXSYNC(sc, sc->sc_txnext, dmamap->dm_nsegs,
GEM_CDTXSYNC(sc, txs->txs_firstdesc, txs->txs_ndescs,
BUS_DMASYNC_PREREAD|BUS_DMASYNC_PREWRITE);
/* Advance the tx pointer. */