sample.c

Linux下wifi实现

				ndx0, tries0, 
				ndx1, tries1, 
				ndx2, tries2, 
				ndx3, tries3, 
				short_tries, ds->ds_txstat.ts_longretry + 1, 
				long_tries > tries0);
		
		if (tries1 && finalTSIdx > 0)
			update_stats(sc, an, frame_size, 
				ndx1, tries1, 
				ndx2, tries2, 
				ndx3, tries3, 
				0, 0, 
				short_tries, ds->ds_txstat.ts_longretry + 1 - tries0, 
				ds->ds_txstat.ts_status);

		if (tries2 && finalTSIdx > 1)
			update_stats(sc, an, frame_size, 
				ndx2, tries2, 
				ndx3, tries3, 
				0, 0,
				0, 0,
				short_tries, ds->ds_txstat.ts_longretry + 1 - tries0 - tries1, 
				ds->ds_txstat.ts_status);

		if (tries3 && finalTSIdx > 2)
			update_stats(sc, an, frame_size, 
				ndx3, tries3, 
				0, 0,
				0, 0,
				0, 0,
				short_tries, ds->ds_txstat.ts_longretry + 1 - tries0 - tries1 - tries2, 
				ds->ds_txstat.ts_status);
	}
}
EXPORT_SYMBOL(ath_rate_tx_complete);

void
ath_rate_newassoc(struct ath_softc *sc, struct ath_node *an, int isnew)
{
	DPRINTF(sc, "%s: %s %s\n", dev_info,
		ether_sprintf(an->an_node.ni_macaddr), __func__);
	if (isnew)
		ath_rate_ctl_reset(sc, &an->an_node);
}
EXPORT_SYMBOL(ath_rate_newassoc);

/*
 * Initialize the tables for a node.
 */
static void
ath_rate_ctl_reset(struct ath_softc *sc, struct ieee80211_node *ni)
{
	struct ath_node *an = ATH_NODE(ni);
	struct sample_node *sn = ATH_NODE_SAMPLE(an);
	struct ieee80211vap *vap = ni->ni_vap;
	const HAL_RATE_TABLE *rt = sc->sc_currates;
	int x, y;
	int srate;
	sn->num_rates = 0;

	if (rt == NULL) {
		printk(KERN_WARNING "no rates yet! mode %u\n", sc->sc_curmode);
		return;
	}
        sn->static_rate_ndx = -1;

	sn->num_rates = ni->ni_rates.rs_nrates;
        for (x = 0; x < ni->ni_rates.rs_nrates; x++) {
		sn->rates[x].rate = ni->ni_rates.rs_rates[x] & IEEE80211_RATE_VAL;
		sn->rates[x].rix = sc->sc_rixmap[sn->rates[x].rate];
		if (sn->rates[x].rix == 0xff) {
			DPRINTF(sc, "%s: %s ignore bogus rix at %d\n",
				dev_info, __func__, x);
			continue;
		}
		sn->rates[x].rateCode = rt->info[sn->rates[x].rix].rateCode;
		sn->rates[x].shortPreambleRateCode = 
			rt->info[sn->rates[x].rix].rateCode | 
			rt->info[sn->rates[x].rix].shortPreamble;
	}
	
	ni->ni_txrate = 0;
	sn->num_rates = ni->ni_rates.rs_nrates;

	if (sn->num_rates <= 0) {
		DPRINTF(sc, "%s: %s %s no rates (fixed %d) \n",
			dev_info, __func__, ether_sprintf(ni->ni_macaddr),
			vap->iv_fixed_rate);
		/* there are no rates yet we're done */
		return;
	}

	if (vap->iv_fixed_rate != -1) {
		srate = sn->num_rates - 1;

		/*
		 * A fixed rate is to be used; ic_fixed_rate is an
		 * index into the supported rate set.  Convert this
		 * to the index into the negotiated rate set for
		 * the node.  We know the rate is there because the
		 * rate set is checked when the station associates.
		 */
		/* NB: the rate set is assumed sorted */
		for (; srate >= 0 && (ni->ni_rates.rs_rates[srate] & IEEE80211_RATE_VAL) != vap->iv_fixed_rate; srate--);

		KASSERT(srate >= 0,
			("fixed rate %d not in rate set", vap->iv_fixed_rate));

		sn->static_rate_ndx = srate;
		ni->ni_txrate = srate;
		DPRINTF(sc, "%s: %s %s fixed rate %d%sMbps\n",
			dev_info, __func__, ether_sprintf(ni->ni_macaddr), 
			sn->rates[srate].rate / 2,
			(sn->rates[srate].rate % 0x1) ? ".5" : " ");
		return;
	}
	

	for (y = 0; y < NUM_PACKET_SIZE_BINS; y++) {
		int size = bin_to_size(y);
		int ndx = 0;
		sn->packets_sent[y] = 0;
		sn->current_sample_ndx[y] = -1;
		sn->last_sample_ndx[y] = 0;
		
		for (x = 0; x < ni->ni_rates.rs_nrates; x++) {
			sn->stats[y][x].successive_failures = 0;
			sn->stats[y][x].tries = 0;
			sn->stats[y][x].total_packets = 0;
			sn->stats[y][x].packets_acked = 0;
			sn->stats[y][x].last_tx = 0;

			sn->stats[y][x].perfect_tx_time = 
				calc_usecs_unicast_packet(sc, size, 
					sn->rates[x].rix,
					0, 0);
			sn->stats[y][x].average_tx_time =
				sn->stats[y][x].perfect_tx_time;

		}

		/* set the initial rate */
		for (ndx = sn->num_rates-1; ndx > 0; ndx--)
			if (sn->rates[ndx].rate <= 72)
				break;
		sn->current_rate[y] = ndx;
	}

	DPRINTF(sc, "%s: %s %s %d rates %d%sMbps (%dus)- %d%sMbps (%dus)\n",
		dev_info, __func__, ether_sprintf(ni->ni_macaddr), 
		sn->num_rates,
		sn->rates[0].rate / 2, sn->rates[0].rate % 0x1 ? ".5" : "",
		sn->stats[1][0].perfect_tx_time,
		sn->rates[sn->num_rates-1].rate / 2,
		sn->rates[sn->num_rates-1].rate % 0x1 ? ".5" : "",
		sn->stats[1][sn->num_rates-1].perfect_tx_time);

	ni->ni_txrate = sn->current_rate[0];
}

static void
ath_rate_cb(void *arg, struct ieee80211_node *ni)
{
        ath_rate_ctl_reset(ni->ni_ic->ic_dev->priv, ni);
}

/*
 * Reset the rate control state for each 802.11 state transition.
 */
void
ath_rate_newstate(struct ieee80211vap *vap, enum ieee80211_state newstate)
{
	struct ieee80211com *ic = vap->iv_ic;
	
	if (newstate == IEEE80211_S_RUN) {
		if (ic->ic_opmode != IEEE80211_M_STA) {
			/*
			 * Sync rates for associated stations and neighbors.
			 */
			ieee80211_iterate_nodes(&ic->ic_sta, ath_rate_cb, NULL);
		}
		ath_rate_newassoc(ic->ic_dev->priv, ATH_NODE(vap->iv_bss), 1);
	}
}
EXPORT_SYMBOL(ath_rate_newstate);

struct ath_ratectrl *
ath_rate_attach(struct ath_softc *sc)
{
	struct sample_softc *osc;
	DPRINTF(sc, "%s: %s\n", dev_info, __func__);
	
	osc = kmalloc(sizeof(struct sample_softc), GFP_ATOMIC);
	if (osc == NULL)
		return NULL;
	osc->arc.arc_space = sizeof(struct sample_node);
	osc->arc.arc_vap_space = 0;

	osc->ath_smoothing_rate = ath_smoothing_rate;
	osc->ath_sample_rate = ath_sample_rate;

	return &osc->arc;
}
EXPORT_SYMBOL(ath_rate_attach);

void
ath_rate_detach(struct ath_ratectrl *arc)
{
	struct sample_softc *osc = (struct sample_softc *) arc;
	kfree(osc);
}
EXPORT_SYMBOL(ath_rate_detach);

#ifdef CONFIG_SYSCTL
static int
proc_read_nodes(struct ieee80211vap *vap, const int size, char *buf, int space)
{
	char *p = buf;
	struct ieee80211_node *ni;
	struct ath_node *an;
	struct sample_node *sn;
	struct ieee80211_node_table *nt = 
		(struct ieee80211_node_table *) &vap->iv_ic->ic_sta;
	int x = 0;
	int size_bin = 0;

	TAILQ_FOREACH(ni, &nt->nt_node, ni_list) {
		/* Assume each node needs 500 bytes */
		if (buf + space < p + 500)
			break;
		an = ATH_NODE(ni);
		sn = ATH_NODE_SAMPLE(an);
		/* Skip ourself */
		if (memcmp(vap->iv_myaddr, ni->ni_macaddr, 
					IEEE80211_ADDR_LEN)==0) {
			continue;
		}

		size_bin = size_to_bin(size);
		p += sprintf(p, "%s\n", ether_sprintf(ni->ni_macaddr));
		p += sprintf(p, 
				"rate\ttt\tperfect\tfailed\tpkts\tavg_tries\tlast_tx\n");
		for (x = 0; x < sn->num_rates; x++) {
			int a = 1;
			int t = 1;

			p += sprintf(p, "%s", 
					(x == sn->current_rate[size_bin]) ? "*" : " ");

			p += sprintf(p, "%3d%s",
					sn->rates[x].rate/2,
					(sn->rates[x].rate & 0x1) != 0 ? ".5" : "  ");

			p += sprintf(p, "\t%4d\t%4d\t%2d\t%3d",
					sn->stats[size_bin][x].average_tx_time,
					sn->stats[size_bin][x].perfect_tx_time,
					sn->stats[size_bin][x].successive_failures,
					sn->stats[size_bin][x].total_packets);

			if (sn->stats[size_bin][x].total_packets) {
				a = sn->stats[size_bin][x].total_packets;
				t = sn->stats[size_bin][x].tries;
			}
			p += sprintf(p, "\t%d.%02d\t", t/a, (t*100/a) % 100);
			if (sn->stats[size_bin][x].last_tx) {
				unsigned d = jiffies - 
					sn->stats[size_bin][x].last_tx;
				p += sprintf(p, "%d.%02d", d / HZ, d % HZ);
			} else {
				p += sprintf(p, "-");
			}
			p += sprintf(p, "\n");
		}
		printk("\n");
	}

	return (p - buf);
}

int
proc_ratesample_open(struct inode *inode, struct file *file)
{
	struct proc_ieee80211_priv *pv = NULL;
	struct proc_dir_entry *dp = PDE(inode);
	struct ieee80211vap *vap = dp->data;
	int size = 0;

	if (!(file->private_data = kmalloc(sizeof(struct proc_ieee80211_priv),
					GFP_KERNEL)))
		return -ENOMEM;

	/* intially allocate both read and write buffers */
	pv = (struct proc_ieee80211_priv *) file->private_data;
	memset(pv, 0, sizeof(struct proc_ieee80211_priv));
	pv->rbuf = vmalloc(MAX_PROC_IEEE80211_SIZE);
	if (!pv->rbuf) {
		kfree(pv);
		return -ENOMEM;
	}
	pv->wbuf = vmalloc(MAX_PROC_IEEE80211_SIZE);
	if (!pv->wbuf) {
		vfree(pv->rbuf);
		kfree(pv);
		return -ENOMEM;
	}
	memset(pv->wbuf, 0, MAX_PROC_IEEE80211_SIZE);
	memset(pv->rbuf, 0, MAX_PROC_IEEE80211_SIZE);
	pv->max_wlen = MAX_PROC_IEEE80211_SIZE;
	pv->max_rlen = MAX_PROC_IEEE80211_SIZE;

	/* Determine what size packets to get stats for based on proc filename */
	size = (int)simple_strtol(dp->name + 10, NULL, 0);

	/* now read the data into the buffer */
	pv->rlen = proc_read_nodes(vap, size, pv->rbuf, MAX_PROC_IEEE80211_SIZE);
	return 0;
}

static struct file_operations proc_ratesample_ops = {
	.read = NULL,
	.write = NULL,
	.open = proc_ratesample_open,
	.release = NULL,
};

void
ath_rate_dynamic_proc_register(struct ieee80211vap *vap)
{		
	/* Create proc entries for the rate control algorithm */
	ieee80211_proc_vcreate(vap, &proc_ratesample_ops, "ratestats_250");
	ieee80211_proc_vcreate(vap, &proc_ratesample_ops, "ratestats_1600");
	ieee80211_proc_vcreate(vap, &proc_ratesample_ops, "ratestats_3000");	
}
EXPORT_SYMBOL(ath_rate_dynamic_proc_register);
#endif /* CONFIG_SYSCTL */

MODULE_AUTHOR("John Bicket");
MODULE_DESCRIPTION("SampleRate bit-rate selection algorithm for Atheros devices");
#ifdef MODULE_VERSION
MODULE_VERSION(RELEASE_VERSION);
#endif
#ifdef MODULE_LICENSE
MODULE_LICENSE("Dual BSD/GPL");
#endif

static int __init
init_ath_rate_sample(void)
{
	printk(KERN_INFO "%s: %s\n", dev_info, version);
	return (0);
}
module_init(init_ath_rate_sample);

static void __exit
exit_ath_rate_sample(void)
{
	printk(KERN_INFO "%s: unloaded\n", dev_info);
}
module_exit(exit_ath_rate_sample);