Hi,

I apologize about bringing up an old thread again but I am still having problems disabling Layer 2 acknowledgments in ad hoc mode. Using Lrj's instructions:

In if_ath.c

First, in the ath_attach(), add the codes "OS_REG_WRITE(ah, 0x8048, 0x00000002);", which writes register to disable the hardware auto ACK;
And in the ath_reset(), do the same thing.

Then, in the ath_tx_start(), before the call of ath_hal_setuptxdesc(), add the codes "flags |= HAL_TXDESC_NOACK;", which sets the flags to stop the hw ACK waiting.
    Done.

Note: I have used a * before the sections of code to make it easier to read this email. The first reg write went here (starting line 452):

*       if (ah->ah_abi != HAL_ABI_VERSION) {
*               printk(KERN_ERR "%s: HAL ABI mismatch; "
*                       "driver expects 0x%x, HAL reports 0x%x\n",
*                       dev->name, HAL_ABI_VERSION, ah->ah_abi);
*               error = ENXIO;          /* XXX */
*               goto bad;
*       }
*       sc->sc_ah = ah;
*       OS_REG_WRITE(ah, 0x8048, 0x00000002);
*
*       /*
*        * Check if the MAC has multi-rate retry support.

The second reg write (approx line 2180):

*static int
*ath_reset(struct net_device *dev)
*{
*       struct ath_softc *sc = dev->priv;
*       struct ieee80211com *ic = &sc->sc_ic;
*       struct ath_hal *ah = sc->sc_ah;
*       struct ieee80211_channel *c;
*       HAL_STATUS status;
*       OS_REG_WRITE(ah, 0x8048, 0x00000002);
*
*       /*
*        * Convert to a HAL channel description with the flags

The final flags to prevent nodes waiting for an ack (approx line 7135):

*flags |= HAL_TXDESC_NOACK;
*
*       /*
*        * Formulate first tx descriptor with tx controls.
*        */
*       /* XXX check return value? */
*       ath_hal_setuptxdesc(ah, ds
*                           , pktlen            /* packet length */
*                           , hdrlen            /* header length */


If anyone who has been successful in disabling L2 ACKs could take a look at where I may have gone wrong I would be very grateful.

Thanks
Dave