CVS commit: src/sys/dev/pci

[Manuel Bouyer <bouyer%netbsd.org@localhost>]

Module Name:    src
Committed By:   bouyer
Date:           Mon Apr  9 19:34:51 UTC 2007

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

Log Message:
RX buffers are malloced memory of 9216 bytes. This can require from 1 to
4 DMA memory segments, depending on how the buffer is in memory.
When receiving a packet, we allocate a new one to remplace the one we've
used. It can need more segments than the one it remplace, leading to
corrution of the RX descriptors, and a panic in bus_dmamap_sync() (DIAGNOSTIC
kernels) or possibly memory corruption.

Fix:
- bnx_get_buf() allocates as many buffer as possible, checking the number
  of free RX descriptors. Because one receive buffer is not guaranteed to
  be remplaced on receive, call bnx_get_buf() from bnx_tick() too.
  This also improve error handling from bnx_get_buf().
- use MCLGET() instead of MEXTMALLOC() if we're running with the standard
  ethernet MTU. This gives us more receive buffers and waste less memory.


To generate a diff of this commit:
cvs rdiff -r1.4 -r1.5 src/sys/dev/pci/if_bnx.c

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