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

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