Date: Tue, 21 Sep 1999 21:16:49 +0200 From: Wim Livens <livensw@rc.bel.alcatel.be> To: freebsd-atm@freebsd.org Subject: Re: lanai driver: partially fixed bug Message-ID: <19990921211649.P10019@rc.bel.alcatel.be> In-Reply-To: <Pine.BSF.3.95.990920203056.25863B-100000@ns.uninet.ee>; from Taavi Talvik on Mon, Sep 20, 1999 at 08:37:44PM %2B0300 References: <19990920153711.G10019@rc.bel.alcatel.be> <Pine.BSF.3.95.990920203056.25863B-100000@ns.uninet.ee>
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I've found one bug in the lanai driver:
I've found that the receive fifo overflowed (STATS register,
ATM_OVFL_CNT). This was caused by the fact that the bus mastering
failed (IS register, MASTERABORT). And this in turn seems to be
caused by a bad address for the Rx and Rx buffers for dma. I've
removed two lines (the #if 0 part) in the following code:
#if defined(__FreeBSD__)
/* allocate TX buffer */
if( bus_dmamap_load(sc->tx_dmat, sc->vcslot[slot].tx_map,
sc->vcslot[slot].txstart, LANAI_TRANSMIT_BUFFER_SIZE,
ef_map_rq,
&(sc->vcslot[slot].txseg),
/*flags*/ 0) != 0 ){
printf("ef_attach: bus_dmamap_load");
panic("ef");
}
#if 0
sc->vcslot[slot].txseg.ds_addr = (bus_addr_t)sc->vcslot[slot].txstart;
sc->vcslot[slot].txseg.ds_len = LANAI_TRANSMIT_BUFFER_SIZE;
#endif
#else
and similar for RX buffer and it works. I don't know anything about
memory mapping under FreeBSD but I quite sure that there is something
wrong with the above (original) code. The ds_addr is somthing like
0xc71f2000 which I think can't be a fysical address. After the patch
it was 0x2000.
There is however still a problem: a ping gives a 3% packet loss and
TCP just doesn't get anything through. I also noticed 'ef_recieve:
dropped packet - no mbufs'.
Wim Livens.
Alcatel - Corporate Research Center wim.livens@alcatel.be
Fr. Wellesplein 1 livensw@rc.bel.alcatel.be
B-2018 Antwerpen Tel: +32 3 240 7570
Belgium. Fax: +32 3 240 9932
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