CVS commit: src/sys/dev/ic

[David Young <dyoung%netbsd.org@localhost>]

Module Name:    src
Committed By:   dyoung
Date:           Tue Dec 28 22:21:15 UTC 2004

Modified Files:
        src/sys/dev/ic: rtw.c

Log Message:
If defined(RTW_DEBUG), provide a sysctl (hw.rtw.rxbufs_limit) for
limiting the number of rx buffers an rtw may allocate.  Use this
sysctl to test the code that copes with buffer exhaustion.

Allocate at most RTW_RXQLEN rx buffers, stopping at the sysctl
limit.  Record in sc_nrxdesc how many were allocated, and put the
end-of-ring indication on sc_rxdesc[sc_nrxdesc - 1].  In rtw_init,
if no rx buffers could be allocated, log a complaint, clear
IFF_RUNNING, and exit with an error.

Many changes to accomodate a short rx ring, mainly of the "add a
rx-ring length argument" variety.  XXX I really should consolidate
all of the rx ring variables in one struct and pass that to the
rx-ring subroutines.

Bug fix: after calling MCLGET, use the (m->m_flags & M_EXT) idiom
to check for success, instead of m != NULL.

Bug fix: at the top of rtw_start, if IFF_RUNNING is not set, or
IFF_OACTIVE is, get out.


To generate a diff of this commit:
cvs rdiff -r1.30 -r1.31 src/sys/dev/ic/rtw.c

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