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Commit 9e8571af authored by James Ketrenos's avatar James Ketrenos Committed by Jeff Garzik
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[PATCH] ieee80211: Add QoS (WME) support to the ieee80211 subsystem 



tree a3ad796273e98036eb0e9fc063225070fa24508a
parent 1b9c0aeb377abf8e4a43a86cff42382f74ca0259
author Mohamed Abbas <mabbas@linux.intel.com> 1124447069 -0500
committer James Ketrenos <jketreno@linux.intel.com> 1127313435 -0500

Add QoS (WME) support to the ieee80211 subsystem.

NOTE: This requires drivers that use the ieee80211 hard_start_xmit
(ipw2100 and ipw2200) to add the priority parameter to their callback.

Signed-off-by: default avatarJames Ketrenos <jketreno@linux.intel.com>
Signed-off-by: default avatarJeff Garzik <jgarzik@pobox.com>
parent 2c0aa2a5

include/net/ieee80211.h

+99 −4
Original line number Diff line number Diff line
@@ -92,6 +92,7 @@ 
#define IEEE80211_STYPE_CFACK		0x0050

#define IEEE80211_STYPE_CFPOLL		0x0060

#define IEEE80211_STYPE_CFACKPOLL	0x0070

#define IEEE80211_STYPE_QOS_DATA        0x0080



#define IEEE80211_SCTL_FRAG		0x000F

#define IEEE80211_SCTL_SEQ		0xFFF0
@@ -153,6 +154,7 @@ const char *escape_essid(const char *essid, u8 essid_len); 


#define IEEE80211_DL_TX            (1<<8)

#define IEEE80211_DL_RX            (1<<9)

#define IEEE80211_DL_QOS           (1<<31)



#define IEEE80211_ERROR(f, a...) printk(KERN_ERR "ieee80211: " f, ## a)

#define IEEE80211_WARNING(f, a...) printk(KERN_WARNING "ieee80211: " f, ## a)
@@ -166,6 +168,7 @@ const char *escape_essid(const char *essid, u8 essid_len); 
#define IEEE80211_DEBUG_DROP(f, a...)  IEEE80211_DEBUG(IEEE80211_DL_DROP, f, ## a)

#define IEEE80211_DEBUG_TX(f, a...)  IEEE80211_DEBUG(IEEE80211_DL_TX, f, ## a)

#define IEEE80211_DEBUG_RX(f, a...)  IEEE80211_DEBUG(IEEE80211_DL_RX, f, ## a)

#define IEEE80211_DEBUG_QOS(f, a...)  IEEE80211_DEBUG(IEEE80211_DL_QOS, f, ## a)

#include <linux/netdevice.h>

#include <linux/wireless.h>

#include <linux/if_arp.h>	/* ARPHRD_ETHER */
@@ -493,6 +496,7 @@ enum ieee80211_mfie { 
	MFIE_TYPE_RSN = 48,

	MFIE_TYPE_RATES_EX = 50,

	MFIE_TYPE_GENERIC = 221,

	MFIE_TYPE_QOS_PARAMETER = 222,

};



/* Minimal header; can be used for passing 802.11 frames with sufficient
@@ -540,6 +544,29 @@ struct ieee80211_hdr_4addr { 
	u8 payload[0];

} __attribute__ ((packed));



struct ieee80211_hdr_3addrqos {

	u16 frame_ctl;

	u16 duration_id;

	u8 addr1[ETH_ALEN];

	u8 addr2[ETH_ALEN];

	u8 addr3[ETH_ALEN];

	u16 seq_ctl;

	u8 payload[0];

	u16 qos_ctl;

} __attribute__ ((packed));



struct ieee80211_hdr_4addrqos {

	u16 frame_ctl;

	u16 duration_id;

	u8 addr1[ETH_ALEN];

	u8 addr2[ETH_ALEN];

	u8 addr3[ETH_ALEN];

	u16 seq_ctl;

	u8 addr4[ETH_ALEN];

	u8 payload[0];

	u16 qos_ctl;

} __attribute__ ((packed));



struct ieee80211_info_element {

	u8 id;

	u8 len;
@@ -645,6 +672,65 @@ struct ieee80211_txb { 
#define NETWORK_HAS_OFDM       (1<<1)

#define NETWORK_HAS_CCK        (1<<2)



/* QoS structure */

#define NETWORK_HAS_QOS_PARAMETERS      (1<<3)

#define NETWORK_HAS_QOS_INFORMATION     (1<<4)

#define NETWORK_HAS_QOS_MASK            (NETWORK_HAS_QOS_PARAMETERS | NETWORK_HAS_QOS_INFORMATION)



#define QOS_QUEUE_NUM                   4

#define QOS_OUI_LEN                     3

#define QOS_OUI_TYPE                    2

#define QOS_ELEMENT_ID                  221

#define QOS_OUI_INFO_SUB_TYPE           0

#define QOS_OUI_PARAM_SUB_TYPE          1

#define QOS_VERSION_1                   1

#define QOS_AIFSN_MIN_VALUE             2



struct ieee80211_qos_information_element {

	u8 elementID;

	u8 length;

	u8 qui[QOS_OUI_LEN];

	u8 qui_type;

	u8 qui_subtype;

	u8 version;

	u8 ac_info;

} __attribute__ ((packed));



struct ieee80211_qos_ac_parameter {

	u8 aci_aifsn;

	u8 ecw_min_max;

	u16 tx_op_limit;

} __attribute__ ((packed));



struct ieee80211_qos_parameter_info {

	struct ieee80211_qos_information_element info_element;

	u8 reserved;

	struct ieee80211_qos_ac_parameter ac_params_record[QOS_QUEUE_NUM];

} __attribute__ ((packed));



struct ieee80211_qos_parameters {

	u16 cw_min[QOS_QUEUE_NUM];

	u16 cw_max[QOS_QUEUE_NUM];

	u8 aifs[QOS_QUEUE_NUM];

	u8 flag[QOS_QUEUE_NUM];

	u16 tx_op_limit[QOS_QUEUE_NUM];

} __attribute__ ((packed));



struct ieee80211_qos_data {

	struct ieee80211_qos_parameters parameters;

	int active;

	int supported;

	u8 param_count;

	u8 old_param_count;

};



struct ieee80211_tim_parameters {

	u8 tim_count;

	u8 tim_period;

} __attribute__ ((packed));



/*******************************************************/



struct ieee80211_network {

	/* These entries are used to identify a unique network */

	u8 bssid[ETH_ALEN];
@@ -653,6 +739,8 @@ struct ieee80211_network { 
	u8 ssid[IW_ESSID_MAX_SIZE + 1];

	u8 ssid_len;



	struct ieee80211_qos_data qos_data;



	/* These are network statistics */

	struct ieee80211_rx_stats stats;

	u16 capability;
@@ -672,6 +760,7 @@ struct ieee80211_network { 
	size_t wpa_ie_len;

	u8 rsn_ie[MAX_WPA_IE_LEN];

	size_t rsn_ie_len;

	struct ieee80211_tim_parameters tim;

	struct list_head list;

};
@@ -769,10 +858,13 @@ struct ieee80211_device { 
	void (*set_security) (struct net_device * dev,

			      struct ieee80211_security * sec);

	int (*hard_start_xmit) (struct ieee80211_txb * txb,

				struct net_device * dev);

				struct net_device * dev, int pri);

	int (*reset_port) (struct net_device * dev);

	int (*is_queue_full) (struct net_device * dev, int pri);



	int (*handle_management) (struct net_device * dev,

				  struct ieee80211_network * network, u16 type);



	/* Typical STA methods */

	int (*handle_auth) (struct net_device * dev,

			    struct ieee80211_auth * auth);
@@ -854,11 +946,14 @@ extern inline int ieee80211_is_valid_mode(struct ieee80211_device *ieee, 
extern inline int ieee80211_get_hdrlen(u16 fc)

{

	int hdrlen = IEEE80211_3ADDR_LEN;

	u16 stype = WLAN_FC_GET_STYPE(fc);



	switch (WLAN_FC_GET_TYPE(fc)) {

	case IEEE80211_FTYPE_DATA:

		if ((fc & IEEE80211_FCTL_FROMDS) && (fc & IEEE80211_FCTL_TODS))

			hdrlen = IEEE80211_4ADDR_LEN;

		if (stype & IEEE80211_STYPE_QOS_DATA)

			hdrlen += 2;

		break;

	case IEEE80211_FTYPE_CTL:

		switch (WLAN_FC_GET_STYPE(fc)) {

net/ieee80211/ieee80211_rx.c

+315 −19
Original line number Diff line number Diff line
@@ -534,6 +534,9 @@ int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb, 


	/* Nullfunc frames may have PS-bit set, so they must be passed to

	 * hostap_handle_sta_rx() before being dropped here. */



	stype &= ~IEEE80211_STYPE_QOS_DATA;



	if (stype != IEEE80211_STYPE_DATA &&

	    stype != IEEE80211_STYPE_DATA_CFACK &&

	    stype != IEEE80211_STYPE_DATA_CFPOLL &&
@@ -758,6 +761,264 @@ int ieee80211_rx(struct ieee80211_device *ieee, struct sk_buff *skb, 


#define MGMT_FRAME_FIXED_PART_LENGTH		0x24



static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };



/*

* Make ther structure we read from the beacon packet has

* the right values

*/

static int ieee80211_verify_qos_info(struct ieee80211_qos_information_element

				     *info_element, int sub_type)

{



	if (info_element->qui_subtype != sub_type)

		return -1;

	if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))

		return -1;

	if (info_element->qui_type != QOS_OUI_TYPE)

		return -1;

	if (info_element->version != QOS_VERSION_1)

		return -1;



	return 0;

}



/*

 * Parse a QoS parameter element

 */

static int ieee80211_read_qos_param_element(struct ieee80211_qos_parameter_info

					    *element_param, struct ieee80211_info_element

					    *info_element)

{

	int ret = 0;

	u16 size = sizeof(struct ieee80211_qos_parameter_info) - 2;



	if ((info_element == NULL) || (element_param == NULL))

		return -1;



	if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) {

		memcpy(element_param->info_element.qui, info_element->data,

		       info_element->len);

		element_param->info_element.elementID = info_element->id;

		element_param->info_element.length = info_element->len;

	} else

		ret = -1;

	if (ret == 0)

		ret = ieee80211_verify_qos_info(&element_param->info_element,

						QOS_OUI_PARAM_SUB_TYPE);

	return ret;

}



/*

 * Parse a QoS information element

 */

static int ieee80211_read_qos_info_element(struct

					   ieee80211_qos_information_element

					   *element_info, struct ieee80211_info_element

					   *info_element)

{

	int ret = 0;

	u16 size = sizeof(struct ieee80211_qos_information_element) - 2;



	if (element_info == NULL)

		return -1;

	if (info_element == NULL)

		return -1;



	if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) {

		memcpy(element_info->qui, info_element->data,

		       info_element->len);

		element_info->elementID = info_element->id;

		element_info->length = info_element->len;

	} else

		ret = -1;



	if (ret == 0)

		ret = ieee80211_verify_qos_info(element_info,

						QOS_OUI_INFO_SUB_TYPE);

	return ret;

}



/*

 * Write QoS parameters from the ac parameters.

 */

static int ieee80211_qos_convert_ac_to_parameters(struct

						  ieee80211_qos_parameter_info

						  *param_elm, struct

						  ieee80211_qos_parameters

						  *qos_param)

{

	int rc = 0;

	int i;

	struct ieee80211_qos_ac_parameter *ac_params;

	u32 txop;

	u8 cw_min;

	u8 cw_max;



	for (i = 0; i < QOS_QUEUE_NUM; i++) {

		ac_params = &(param_elm->ac_params_record[i]);



		qos_param->aifs[i] = (ac_params->aci_aifsn) & 0x0F;

		qos_param->aifs[i] -= (qos_param->aifs[i] < 2) ? 0 : 2;



		cw_min = ac_params->ecw_min_max & 0x0F;

		qos_param->cw_min[i] = (u16) ((1 << cw_min) - 1);



		cw_max = (ac_params->ecw_min_max & 0xF0) >> 4;

		qos_param->cw_max[i] = (u16) ((1 << cw_max) - 1);



		qos_param->flag[i] =

		    (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;



		txop = le16_to_cpu(ac_params->tx_op_limit) * 32;

		qos_param->tx_op_limit[i] = (u16) txop;

	}

	return rc;

}



/*

 * we have a generic data element which it may contain QoS information or

 * parameters element. check the information element length to decide

 * which type to read

 */

static int ieee80211_parse_qos_info_param_IE(struct ieee80211_info_element

					     *info_element,

					     struct ieee80211_network *network)

{

	int rc = 0;

	struct ieee80211_qos_parameters *qos_param = NULL;

	struct ieee80211_qos_information_element qos_info_element;



	rc = ieee80211_read_qos_info_element(&qos_info_element, info_element);



	if (rc == 0) {

		network->qos_data.param_count = qos_info_element.ac_info & 0x0F;

		network->flags |= NETWORK_HAS_QOS_INFORMATION;

	} else {

		struct ieee80211_qos_parameter_info param_element;



		rc = ieee80211_read_qos_param_element(&param_element,

						      info_element);

		if (rc == 0) {

			qos_param = &(network->qos_data.parameters);

			ieee80211_qos_convert_ac_to_parameters(&param_element,

							       qos_param);

			network->flags |= NETWORK_HAS_QOS_PARAMETERS;

			network->qos_data.param_count =

			    param_element.info_element.ac_info & 0x0F;

		}

	}



	if (rc == 0) {

		IEEE80211_DEBUG_QOS("QoS is supported\n");

		network->qos_data.supported = 1;

	}

	return rc;

}



static int ieee80211_handle_assoc_resp(struct ieee80211_device *ieee, struct ieee80211_assoc_response

				       *frame, struct ieee80211_rx_stats *stats)

{

	struct ieee80211_network network_resp;

	struct ieee80211_network *network = &network_resp;

	struct ieee80211_info_element *info_element;

	struct net_device *dev = ieee->dev;

	u16 left;



	network->flags = 0;

	network->qos_data.active = 0;

	network->qos_data.supported = 0;

	network->qos_data.param_count = 0;

	network->qos_data.old_param_count = 0;



	//network->atim_window = le16_to_cpu(frame->aid) & (0x3FFF);

	network->atim_window = le16_to_cpu(frame->aid);

	network->listen_interval = le16_to_cpu(frame->status);



	info_element = frame->info_element;

	left = stats->len - sizeof(*frame);



	while (left >= sizeof(struct ieee80211_info_element)) {

		if (sizeof(struct ieee80211_info_element) +

		    info_element->len > left) {

			IEEE80211_DEBUG_QOS("ASSOC RESP: parse failed: "

					    "info_element->len + 2 > left : "

					    "info_element->len+2=%zd left=%d, id=%d.\n",

					    info_element->len +

					    sizeof(struct

						   ieee80211_info_element),

					    left, info_element->id);

			return 1;

		}



		switch (info_element->id) {

		case MFIE_TYPE_SSID:

			if (ieee80211_is_empty_essid(info_element->data,

						     info_element->len)) {

				network->flags |= NETWORK_EMPTY_ESSID;

				break;

			}



			network->ssid_len = min(info_element->len,

						(u8) IW_ESSID_MAX_SIZE);

			memcpy(network->ssid, info_element->data,

			       network->ssid_len);

			if (network->ssid_len < IW_ESSID_MAX_SIZE)

				memset(network->ssid + network->ssid_len, 0,

				       IW_ESSID_MAX_SIZE - network->ssid_len);



			IEEE80211_DEBUG_QOS("MFIE_TYPE_SSID: '%s' len=%d.\n",

					    network->ssid, network->ssid_len);

			break;



		case MFIE_TYPE_TIM:

			IEEE80211_DEBUG_QOS("MFIE_TYPE_TIM: ignored\n");

			break;



		case MFIE_TYPE_IBSS_SET:

			IEEE80211_DEBUG_QOS("MFIE_TYPE_IBSS_SET: ignored\n");

			break;



		case MFIE_TYPE_CHALLENGE:

			IEEE80211_DEBUG_QOS("MFIE_TYPE_CHALLENGE: ignored\n");

			break;



		case MFIE_TYPE_GENERIC:

			IEEE80211_DEBUG_QOS("MFIE_TYPE_GENERIC: %d bytes\n",

					    info_element->len);

			ieee80211_parse_qos_info_param_IE(info_element,

							  network);

			break;



		case MFIE_TYPE_RSN:

			IEEE80211_DEBUG_QOS("MFIE_TYPE_RSN: %d bytes\n",

					    info_element->len);

			break;



		case MFIE_TYPE_QOS_PARAMETER:

			printk("QoS Error need to parse QOS_PARAMETER IE\n");

			break;



		default:

			IEEE80211_DEBUG_QOS("unsupported IE %d\n",

					    info_element->id);

			break;

		}



		left -= sizeof(struct ieee80211_info_element) +

		    info_element->len;

		info_element = (struct ieee80211_info_element *)

		    &info_element->data[info_element->len];

	}



	if (ieee->handle_assoc_response != NULL)

		ieee->handle_assoc_response(dev, frame, network);



	return 0;

}



/***************************************************/



static inline int ieee80211_is_ofdm_rate(u8 rate)

{

	switch (rate & ~IEEE80211_BASIC_RATE_MASK) {
@@ -786,6 +1047,9 @@ static inline int ieee80211_network_init(struct ieee80211_device *ieee, struct i 
	struct ieee80211_info_element *info_element;

	u16 left;

	u8 i;

	network->qos_data.active = 0;

	network->qos_data.supported = 0;

	network->qos_data.param_count = 0;



	/* Pull out fixed field data */

	memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
@@ -813,13 +1077,11 @@ static inline int ieee80211_network_init(struct ieee80211_device *ieee, struct i 


	info_element = beacon->info_element;

	left = stats->len - sizeof(*beacon);

	while (left >= sizeof(struct ieee80211_info_element)) {

		if (sizeof(struct ieee80211_info_element) + info_element->len >

		    left) {

	while (left >= sizeof(*info_element)) {

		if (sizeof(*info_element) + info_element->len > left) {

			IEEE80211_DEBUG_SCAN

			    ("SCAN: parse failed: info_element->len + 2 > left : info_element->len+2=%Zd left=%d.\n",

			     info_element->len +

			     sizeof(struct ieee80211_info_element), left);

			     info_element->len + sizeof(*info_element), left);

			return 1;

		}
@@ -847,15 +1109,14 @@ static inline int ieee80211_network_init(struct ieee80211_device *ieee, struct i 
#ifdef CONFIG_IEEE80211_DEBUG

			p = rates_str;

#endif

			network->rates_len =

			    min(info_element->len, MAX_RATES_LENGTH);

			network->rates_len = min(info_element->len,

						 MAX_RATES_LENGTH);

			for (i = 0; i < network->rates_len; i++) {

				network->rates[i] = info_element->data[i];

#ifdef CONFIG_IEEE80211_DEBUG

				p += snprintf(p,

					      sizeof(rates_str) - (p -

								   rates_str),

					      "%02X ", network->rates[i]);

				p += snprintf(p, sizeof(rates_str) -

					      (p - rates_str), "%02X ",

					      network->rates[i]);

#endif

				if (ieee80211_is_ofdm_rate

				    (info_element->data[i])) {
@@ -875,15 +1136,14 @@ static inline int ieee80211_network_init(struct ieee80211_device *ieee, struct i 
#ifdef CONFIG_IEEE80211_DEBUG

			p = rates_str;

#endif

			network->rates_ex_len =

			    min(info_element->len, MAX_RATES_EX_LENGTH);

			network->rates_ex_len = min(info_element->len,

						    MAX_RATES_EX_LENGTH);

			for (i = 0; i < network->rates_ex_len; i++) {

				network->rates_ex[i] = info_element->data[i];

#ifdef CONFIG_IEEE80211_DEBUG

				p += snprintf(p,

					      sizeof(rates_str) - (p -

								   rates_str),

					      "%02X ", network->rates[i]);

				p += snprintf(p, sizeof(rates_str) -

					      (p - rates_str), "%02X ",

					      network->rates[i]);

#endif

				if (ieee80211_is_ofdm_rate

				    (info_element->data[i])) {
@@ -929,6 +1189,10 @@ static inline int ieee80211_network_init(struct ieee80211_device *ieee, struct i 
		case MFIE_TYPE_GENERIC:

			IEEE80211_DEBUG_SCAN("MFIE_TYPE_GENERIC: %d bytes\n",

					     info_element->len);

			if (!ieee80211_parse_qos_info_param_IE(info_element,

							       network))

				break;



			if (info_element->len >= 4 &&

			    info_element->data[0] == 0x00 &&

			    info_element->data[1] == 0x50 &&
@@ -950,14 +1214,18 @@ static inline int ieee80211_network_init(struct ieee80211_device *ieee, struct i 
			       network->rsn_ie_len);

			break;



		case MFIE_TYPE_QOS_PARAMETER:

			printk(KERN_ERR

			       "QoS Error need to parse QOS_PARAMETER IE\n");

			break;



		default:

			IEEE80211_DEBUG_SCAN("unsupported IE %d\n",

					     info_element->id);

			break;

		}



		left -= sizeof(struct ieee80211_info_element) +

		    info_element->len;

		left -= sizeof(*info_element) + info_element->len;

		info_element = (struct ieee80211_info_element *)

		    &info_element->data[info_element->len];

	}
@@ -1004,6 +1272,9 @@ static inline int is_same_network(struct ieee80211_network *src, 
static inline void update_network(struct ieee80211_network *dst,

				  struct ieee80211_network *src)

{

	int qos_active;

	u8 old_param;



	memcpy(&dst->stats, &src->stats, sizeof(struct ieee80211_rx_stats));

	dst->capability = src->capability;

	memcpy(dst->rates, src->rates, src->rates_len);
@@ -1026,6 +1297,28 @@ static inline void update_network(struct ieee80211_network *dst, 
	dst->rsn_ie_len = src->rsn_ie_len;



	dst->last_scanned = jiffies;

	qos_active = src->qos_data.active;

	old_param = dst->qos_data.old_param_count;

	if (dst->flags & NETWORK_HAS_QOS_MASK)

		memcpy(&dst->qos_data, &src->qos_data,

		       sizeof(struct ieee80211_qos_data));

	else {

		dst->qos_data.supported = src->qos_data.supported;

		dst->qos_data.param_count = src->qos_data.param_count;

	}



	if (dst->qos_data.supported == 1) {

		if (dst->ssid_len)

			IEEE80211_DEBUG_QOS

			    ("QoS the network %s is QoS supported\n",

			     dst->ssid);

		else

			IEEE80211_DEBUG_QOS

			    ("QoS the network is QoS supported\n");

	}

	dst->qos_data.active = qos_active;

	dst->qos_data.old_param_count = old_param;



	/* dst->last_associate is not overwritten */

}
@@ -1167,6 +1460,9 @@ void ieee80211_rx_mgt(struct ieee80211_device *ieee, 
		IEEE80211_DEBUG_MGMT("received ASSOCIATION RESPONSE (%d)\n",

				     WLAN_FC_GET_STYPE(le16_to_cpu

						       (header->frame_ctl)));

		ieee80211_handle_assoc_resp(ieee,

					    (struct ieee80211_assoc_response *)

					    header, stats);

		break;



	case IEEE80211_STYPE_REASSOC_RESP:

net/ieee80211/ieee80211_tx.c

+3 −2
Original line number Diff line number Diff line
@@ -465,7 +465,7 @@ int ieee80211_xmit(struct sk_buff *skb, struct net_device *dev) 
	dev_kfree_skb_any(skb);



	if (txb) {

		int ret = (*ieee->hard_start_xmit) (txb, dev);

		int ret = (*ieee->hard_start_xmit) (txb, dev, priority);

		if (ret == 0) {

			stats->tx_packets++;

			stats->tx_bytes += txb->payload_size;
@@ -500,6 +500,7 @@ int ieee80211_tx_frame(struct ieee80211_device *ieee, 
	unsigned long flags;

	struct net_device_stats *stats = &ieee->stats;

	struct sk_buff *skb_frag;

	int priority = -1;



	spin_lock_irqsave(&ieee->lock, flags);
@@ -540,7 +541,7 @@ int ieee80211_tx_frame(struct ieee80211_device *ieee, 
	spin_unlock_irqrestore(&ieee->lock, flags);



	if (txb) {

		if ((*ieee->hard_start_xmit) (txb, ieee->dev) == 0) {

		if ((*ieee->hard_start_xmit) (txb, ieee->dev, priority) == 0) {

			stats->tx_packets++;

			stats->tx_bytes += txb->payload_size;

			return 0;