rc80211.h File Reference

Rate-control algorithm prototype for 802.11. More...

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Functions
	FILE_LICENCE (GPL2_OR_LATER)
struct rc80211_ctx *	rc80211_init (struct net80211_device *dev)
void	rc80211_update_tx (struct net80211_device *dev, int retries, int rc)
	Update rate-control state for transmitted packet.
void	rc80211_update_rx (struct net80211_device *dev, int retry, u16 rate)
	Update rate-control state for received packet.
void	rc80211_free (struct rc80211_ctx *ctx)
	Free rate-control context.

---

Detailed Description

Rate-control algorithm prototype for 802.11.

Definition in file rc80211.h.

---

Function Documentation

FILE_LICENCE

(

GPL2_OR_LATER

)

struct rc80211_ctx* rc80211_init

(

struct net80211_device *

dev

)

[read]

void rc80211_update_tx	(	struct net80211_device *	dev,
		int	retries,
		int	rc
	)

Update rate-control state for transmitted packet.

Parameters:

	dev	802.11 device
	retries	Number of times packet was transmitted before success
	rc	Return status code for transmission

Definition at line 315 of file rc80211.c.

References DBGC, rc80211_ctx::goodness, net80211_device::rate, net80211_device::rates, rc80211_set_rate(), rc80211_update(), RC_TX_EMERG_FAIL, net80211_device::rctl, rc80211_ctx::started, and TX.

Referenced by net80211_tx_complete().

{
        struct rc80211_ctx *ctx = dev->rctl;

        if ( ! ctx->started )
                return;

        rc80211_update ( dev, TX, dev->rate, retries, rc );

        /* Check if the last RC_TX_EMERG_FAIL packets have all failed */
        if ( ! ( ctx->goodness[TX][dev->rate] &
                 ( ( 1 << ( 2 * RC_TX_EMERG_FAIL ) ) - 1 ) ) ) {
                if ( dev->rate == 0 )
                        DBGC ( dev->rctl, "802.11 RC %p saw %d consecutive "
                               "failed TX, but cannot lower rate any further\n",
                               dev->rctl, RC_TX_EMERG_FAIL );
                else {
                        DBGC ( dev->rctl, "802.11 RC %p lowering rate (%d->%d "
                               "Mbps) due to %d consecutive TX failures\n",
                               dev->rctl, dev->rates[dev->rate] / 10,
                               dev->rates[dev->rate - 1] / 10,
                               RC_TX_EMERG_FAIL );

                        rc80211_set_rate ( dev, dev->rate - 1 );
                }
        }
}

void rc80211_update_rx	(	struct net80211_device *	dev,
		int	retry,
		u16	rate
	)

Update rate-control state for received packet.

Parameters:

	dev	802.11 device
	retry	Whether the received packet had been retransmitted
	rate	Rate at which packet was received, in 100 kbps units

Definition at line 350 of file rc80211.c.

References net80211_device::nr_rates, net80211_device::rates, rc80211_update(), and RX.

Referenced by net80211_rx().

{
        int ridx;

        for ( ridx = 0; ridx < dev->nr_rates && dev->rates[ridx] != rate;
              ridx++ )
                ;
        if ( ridx >= dev->nr_rates )
                return;         /* couldn't find the rate */

        rc80211_update ( dev, RX, ridx, retry, 0 );
}

void rc80211_free

(

struct rc80211_ctx *

ctx

)

Free rate-control context.

Parameters:

ctx

Rate-control context

Definition at line 368 of file rc80211.c.

References free().

Referenced by net80211_free().

{
        free ( ctx );
}