Date: Sat, 08 Jun 2002 23:51:46 -0400 From: Andy Sparrow <spadger@best.com> To: Larry Rosenman <ler@lerctr.org> Cc: Andy Sparrow <spadger@best.com>, freebsd-net@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG Subject: Re: MIB support for network devices in FreeBSD? Message-ID: <20020609035146.55A8F3E2D@CRWdog.demon.co.uk> In-Reply-To: Message from Larry Rosenman <ler@lerctr.org> of "08 Jun 2002 22:11:44 CDT." <1023592304.349.20.camel@lerlaptop>
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> I believe you can get this info if you add the net/snmp or net/snmp4
> port.
Hi Larry,
Thanks for replying.
Hmmm. I'm talking about code that uses a FreeBSD-specific sysctl to
interrogate the in-kernel if MIB counters, like this:
/* gather stats */
int
freebsd_sysctl_get(struct Devices*dev, unsigned long* ip,
unsigned long* op, unsigned long* ib, unsigned long* ob)
{
struct ifmibdata* drvdata = dev->drvdata;
int datamib[6];
int len;
*ip = *op = *ib = *ob = 0;
datamib[0] = CTL_NET;
datamib[1] = PF_LINK;
datamib[2] = NETLINK_GENERIC;
datamib[3] = IFMIB_IFDATA;
datamib[4] = 1; /* fill in later */
datamib[5] = IFDATA_GENERAL;
datamib[4] = IFMIB_IFCOUNT;
len = sizeof(struct ifmibdata);
if(sysctl(datamib, 6, drvdata, &len, NULL, 0) < 0)
return 1;
*ip = drvdata->ifmd_data.ifi_ipackets;
*op = drvdata->ifmd_data.ifi_opackets;
*ib = drvdata->ifmd_data.ifi_ibytes;
*ob = drvdata->ifmd_data.ifi_obytes;
return 0;
}
But these stats don't seem to be collected for at least some network card
drivers, presumably because those drivers aren't collecting those stats, e.g.
they don't #include <net/if_mib.h>, and thus don't allocate a mib structure or
increment any counters in that structure.
I can confirm that it definately doesn't work for the 'wi' and 'lo' drivers...
However, it definately seems to work for the xl driver...
Try this:
cd /usr/src/sys/dev; find . -exec grep mib {} /dev/null \;
'awi', 'ed' & 'ray' drivers seem to have the most complete implementations,
but 'fe' & 'xe' seem to have partial implementations (error counters only).
They're relatively short, so here's one by way of illustration:
./xe/if_xe.c:#include <net/if_mib.h>
./xe/if_xe.c: scp->ifp->if_linkmib = &scp->mibdata;
./xe/if_xe.c: scp->ifp->if_linkmiblen = sizeof scp->mibdata;
./xe/if_xe.c: scp->mibdata.dot3StatsSingleCollisionFrames++;
./xe/if_xe.c: scp->mibdata.dot3StatsCollFrequencies[0]++;
./xe/if_xe.c: scp->mibdata.dot3StatsMultipleCollisionFrames++;
./xe/if_xe.c: scp->mibdata.dot3StatsCollFrequencies[scp->
tx_collisions-1]++;
./xe/if_xe.c: scp->mibdata.dot3StatsMultipleCollisionFrames += sent;
./xe/if_xe.c: scp->mibdata.dot3StatsExcessiveCollisions++;
./xe/if_xe.c: scp->mibdata.dot3StatsMultipleCollisionFrames++;
./xe/if_xe.c: scp->mibdata.dot3StatsCollFrequencies[15]++;
./xe/if_xe.c: scp->mibData.dot3StatsMissedFrames++;
./xe/if_xe.c: scp->mibdata.dot3StatsFrameTooLongs++;
./xe/if_xe.c: scp->mibdata.dot3StatsFCSErrors++;
./xe/if_xe.c: scp->mibdata.dot3StatsAlignmentErrors++;
./xe/if_xe.c: scp->mibdata.dot3StatsInternalMacReceiveErrors++;
./xe/if_xevar.h: struct ifmib_iso_8802_3 mibdata;
However, most of the drivers don't seem to have any code like this in them -
and at least some of those drivers don't work with the 3rd-party application
code above.
Should they? Or is this an older interface?
I'd like to advise the author so he can fix a very useful dockapp for me - or,
if this is the way to go, I'll badger Bill Paul to fix the 'wi' driver - oh,
wait a moment, maybe generating patches would be safer :)
Regards,
AS
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