1 /*
2 * NXP Wireless LAN device driver: AP TX and RX data handling
3 *
4 * Copyright 2011-2020 NXP
5 *
6 * This software file (the "File") is distributed by NXP
7 * under the terms of the GNU General Public License Version 2, June 1991
8 * (the "License"). You may use, redistribute and/or modify this File in
9 * accordance with the terms and conditions of the License, a copy of which
10 * is available by writing to the Free Software Foundation, Inc.,
11 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
12 * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
13 *
14 * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
16 * ARE EXPRESSLY DISCLAIMED. The License provides additional details about
17 * this warranty disclaimer.
18 */
19
20 #include "decl.h"
21 #include "ioctl.h"
22 #include "main.h"
23 #include "wmm.h"
24 #include "11n_aggr.h"
25 #include "11n_rxreorder.h"
26
27 /* This function checks if particular RA list has packets more than low bridge
28 * packet threshold and then deletes packet from this RA list.
29 * Function deletes packets from such RA list and returns true. If no such list
30 * is found, false is returned.
31 */
32 static bool
mwifiex_uap_del_tx_pkts_in_ralist(struct mwifiex_private * priv,struct list_head * ra_list_head,int tid)33 mwifiex_uap_del_tx_pkts_in_ralist(struct mwifiex_private *priv,
34 struct list_head *ra_list_head,
35 int tid)
36 {
37 struct mwifiex_ra_list_tbl *ra_list;
38 struct sk_buff *skb, *tmp;
39 bool pkt_deleted = false;
40 struct mwifiex_txinfo *tx_info;
41 struct mwifiex_adapter *adapter = priv->adapter;
42
43 list_for_each_entry(ra_list, ra_list_head, list) {
44 if (skb_queue_empty(&ra_list->skb_head))
45 continue;
46
47 skb_queue_walk_safe(&ra_list->skb_head, skb, tmp) {
48 tx_info = MWIFIEX_SKB_TXCB(skb);
49 if (tx_info->flags & MWIFIEX_BUF_FLAG_BRIDGED_PKT) {
50 __skb_unlink(skb, &ra_list->skb_head);
51 mwifiex_write_data_complete(adapter, skb, 0,
52 -1);
53 if (ra_list->tx_paused)
54 priv->wmm.pkts_paused[tid]--;
55 else
56 atomic_dec(&priv->wmm.tx_pkts_queued);
57 pkt_deleted = true;
58 }
59 if ((atomic_read(&adapter->pending_bridged_pkts) <=
60 MWIFIEX_BRIDGED_PKTS_THR_LOW))
61 break;
62 }
63 }
64
65 return pkt_deleted;
66 }
67
68 /* This function deletes packets from particular RA List. RA list index
69 * from which packets are deleted is preserved so that packets from next RA
70 * list are deleted upon subsequent call thus maintaining fairness.
71 */
mwifiex_uap_cleanup_tx_queues(struct mwifiex_private * priv)72 static void mwifiex_uap_cleanup_tx_queues(struct mwifiex_private *priv)
73 {
74 struct list_head *ra_list;
75 int i;
76
77 spin_lock_bh(&priv->wmm.ra_list_spinlock);
78
79 for (i = 0; i < MAX_NUM_TID; i++, priv->del_list_idx++) {
80 if (priv->del_list_idx == MAX_NUM_TID)
81 priv->del_list_idx = 0;
82 ra_list = &priv->wmm.tid_tbl_ptr[priv->del_list_idx].ra_list;
83 if (mwifiex_uap_del_tx_pkts_in_ralist(priv, ra_list, i)) {
84 priv->del_list_idx++;
85 break;
86 }
87 }
88
89 spin_unlock_bh(&priv->wmm.ra_list_spinlock);
90 }
91
92
mwifiex_uap_queue_bridged_pkt(struct mwifiex_private * priv,struct sk_buff * skb)93 static void mwifiex_uap_queue_bridged_pkt(struct mwifiex_private *priv,
94 struct sk_buff *skb)
95 {
96 struct mwifiex_adapter *adapter = priv->adapter;
97 struct uap_rxpd *uap_rx_pd;
98 struct rx_packet_hdr *rx_pkt_hdr;
99 struct sk_buff *new_skb;
100 struct mwifiex_txinfo *tx_info;
101 int hdr_chop;
102 struct ethhdr *p_ethhdr;
103 struct mwifiex_sta_node *src_node;
104 int index;
105
106 uap_rx_pd = (struct uap_rxpd *)(skb->data);
107 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
108
109 if ((atomic_read(&adapter->pending_bridged_pkts) >=
110 MWIFIEX_BRIDGED_PKTS_THR_HIGH)) {
111 mwifiex_dbg(priv->adapter, ERROR,
112 "Tx: Bridge packet limit reached. Drop packet!\n");
113 kfree_skb(skb);
114 mwifiex_uap_cleanup_tx_queues(priv);
115 return;
116 }
117
118 if (sizeof(*rx_pkt_hdr) +
119 le16_to_cpu(uap_rx_pd->rx_pkt_offset) > skb->len) {
120 mwifiex_dbg(adapter, ERROR,
121 "wrong rx packet offset: len=%d,rx_pkt_offset=%d\n",
122 skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset));
123 priv->stats.rx_dropped++;
124 dev_kfree_skb_any(skb);
125 return;
126 }
127
128 if ((!memcmp(&rx_pkt_hdr->rfc1042_hdr, bridge_tunnel_header,
129 sizeof(bridge_tunnel_header))) ||
130 (!memcmp(&rx_pkt_hdr->rfc1042_hdr, rfc1042_header,
131 sizeof(rfc1042_header)) &&
132 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_AARP &&
133 ntohs(rx_pkt_hdr->rfc1042_hdr.snap_type) != ETH_P_IPX)) {
134 /* Replace the 803 header and rfc1042 header (llc/snap) with
135 * an Ethernet II header, keep the src/dst and snap_type
136 * (ethertype).
137 *
138 * The firmware only passes up SNAP frames converting all RX
139 * data from 802.11 to 802.2/LLC/SNAP frames.
140 *
141 * To create the Ethernet II, just move the src, dst address
142 * right before the snap_type.
143 */
144 p_ethhdr = (struct ethhdr *)
145 ((u8 *)(&rx_pkt_hdr->eth803_hdr)
146 + sizeof(rx_pkt_hdr->eth803_hdr)
147 + sizeof(rx_pkt_hdr->rfc1042_hdr)
148 - sizeof(rx_pkt_hdr->eth803_hdr.h_dest)
149 - sizeof(rx_pkt_hdr->eth803_hdr.h_source)
150 - sizeof(rx_pkt_hdr->rfc1042_hdr.snap_type));
151 memcpy(p_ethhdr->h_source, rx_pkt_hdr->eth803_hdr.h_source,
152 sizeof(p_ethhdr->h_source));
153 memcpy(p_ethhdr->h_dest, rx_pkt_hdr->eth803_hdr.h_dest,
154 sizeof(p_ethhdr->h_dest));
155 /* Chop off the rxpd + the excess memory from
156 * 802.2/llc/snap header that was removed.
157 */
158 hdr_chop = (u8 *)p_ethhdr - (u8 *)uap_rx_pd;
159 } else {
160 /* Chop off the rxpd */
161 hdr_chop = (u8 *)&rx_pkt_hdr->eth803_hdr - (u8 *)uap_rx_pd;
162 }
163
164 /* Chop off the leading header bytes so that it points
165 * to the start of either the reconstructed EthII frame
166 * or the 802.2/llc/snap frame.
167 */
168 skb_pull(skb, hdr_chop);
169
170 if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN) {
171 mwifiex_dbg(priv->adapter, ERROR,
172 "data: Tx: insufficient skb headroom %d\n",
173 skb_headroom(skb));
174 /* Insufficient skb headroom - allocate a new skb */
175 new_skb =
176 skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
177 if (unlikely(!new_skb)) {
178 mwifiex_dbg(priv->adapter, ERROR,
179 "Tx: cannot allocate new_skb\n");
180 kfree_skb(skb);
181 priv->stats.tx_dropped++;
182 return;
183 }
184
185 kfree_skb(skb);
186 skb = new_skb;
187 mwifiex_dbg(priv->adapter, INFO,
188 "info: new skb headroom %d\n",
189 skb_headroom(skb));
190 }
191
192 tx_info = MWIFIEX_SKB_TXCB(skb);
193 memset(tx_info, 0, sizeof(*tx_info));
194 tx_info->bss_num = priv->bss_num;
195 tx_info->bss_type = priv->bss_type;
196 tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT;
197
198 src_node = mwifiex_get_sta_entry(priv, rx_pkt_hdr->eth803_hdr.h_source);
199 if (src_node) {
200 src_node->stats.last_rx = jiffies;
201 src_node->stats.rx_bytes += skb->len;
202 src_node->stats.rx_packets++;
203 src_node->stats.last_tx_rate = uap_rx_pd->rx_rate;
204 src_node->stats.last_tx_htinfo = uap_rx_pd->ht_info;
205 }
206
207 if (is_unicast_ether_addr(rx_pkt_hdr->eth803_hdr.h_dest)) {
208 /* Update bridge packet statistics as the
209 * packet is not going to kernel/upper layer.
210 */
211 priv->stats.rx_bytes += skb->len;
212 priv->stats.rx_packets++;
213
214 /* Sending bridge packet to TX queue, so save the packet
215 * length in TXCB to update statistics in TX complete.
216 */
217 tx_info->pkt_len = skb->len;
218 }
219
220 __net_timestamp(skb);
221
222 index = mwifiex_1d_to_wmm_queue[skb->priority];
223 atomic_inc(&priv->wmm_tx_pending[index]);
224 mwifiex_wmm_add_buf_txqueue(priv, skb);
225 atomic_inc(&adapter->tx_pending);
226 atomic_inc(&adapter->pending_bridged_pkts);
227
228 mwifiex_queue_main_work(priv->adapter);
229
230 return;
231 }
232
233 /*
234 * This function contains logic for AP packet forwarding.
235 *
236 * If a packet is multicast/broadcast, it is sent to kernel/upper layer
237 * as well as queued back to AP TX queue so that it can be sent to other
238 * associated stations.
239 * If a packet is unicast and RA is present in associated station list,
240 * it is again requeued into AP TX queue.
241 * If a packet is unicast and RA is not in associated station list,
242 * packet is forwarded to kernel to handle routing logic.
243 */
mwifiex_handle_uap_rx_forward(struct mwifiex_private * priv,struct sk_buff * skb)244 int mwifiex_handle_uap_rx_forward(struct mwifiex_private *priv,
245 struct sk_buff *skb)
246 {
247 struct mwifiex_adapter *adapter = priv->adapter;
248 struct uap_rxpd *uap_rx_pd;
249 struct rx_packet_hdr *rx_pkt_hdr;
250 u8 ra[ETH_ALEN];
251 struct sk_buff *skb_uap;
252
253 uap_rx_pd = (struct uap_rxpd *)(skb->data);
254 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
255
256 /* don't do packet forwarding in disconnected state */
257 if (!priv->media_connected) {
258 mwifiex_dbg(adapter, ERROR,
259 "drop packet in disconnected state.\n");
260 dev_kfree_skb_any(skb);
261 return 0;
262 }
263
264 memcpy(ra, rx_pkt_hdr->eth803_hdr.h_dest, ETH_ALEN);
265
266 if (is_multicast_ether_addr(ra)) {
267 skb_uap = skb_copy(skb, GFP_ATOMIC);
268 if (likely(skb_uap)) {
269 mwifiex_uap_queue_bridged_pkt(priv, skb_uap);
270 } else {
271 mwifiex_dbg(adapter, ERROR,
272 "failed to copy skb for uAP\n");
273 priv->stats.rx_dropped++;
274 dev_kfree_skb_any(skb);
275 return -1;
276 }
277 } else {
278 if (mwifiex_get_sta_entry(priv, ra)) {
279 /* Requeue Intra-BSS packet */
280 mwifiex_uap_queue_bridged_pkt(priv, skb);
281 return 0;
282 }
283 }
284
285 /* Forward unicat/Inter-BSS packets to kernel. */
286 return mwifiex_process_rx_packet(priv, skb);
287 }
288
mwifiex_uap_recv_packet(struct mwifiex_private * priv,struct sk_buff * skb)289 int mwifiex_uap_recv_packet(struct mwifiex_private *priv,
290 struct sk_buff *skb)
291 {
292 struct mwifiex_adapter *adapter = priv->adapter;
293 struct mwifiex_sta_node *src_node;
294 struct ethhdr *p_ethhdr;
295 struct sk_buff *skb_uap;
296 struct mwifiex_txinfo *tx_info;
297
298 if (!skb)
299 return -1;
300
301 p_ethhdr = (void *)skb->data;
302 src_node = mwifiex_get_sta_entry(priv, p_ethhdr->h_source);
303 if (src_node) {
304 src_node->stats.last_rx = jiffies;
305 src_node->stats.rx_bytes += skb->len;
306 src_node->stats.rx_packets++;
307 }
308
309 if (is_multicast_ether_addr(p_ethhdr->h_dest) ||
310 mwifiex_get_sta_entry(priv, p_ethhdr->h_dest)) {
311 if (skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN)
312 skb_uap =
313 skb_realloc_headroom(skb, MWIFIEX_MIN_DATA_HEADER_LEN);
314 else
315 skb_uap = skb_copy(skb, GFP_ATOMIC);
316
317 if (likely(skb_uap)) {
318 tx_info = MWIFIEX_SKB_TXCB(skb_uap);
319 memset(tx_info, 0, sizeof(*tx_info));
320 tx_info->bss_num = priv->bss_num;
321 tx_info->bss_type = priv->bss_type;
322 tx_info->flags |= MWIFIEX_BUF_FLAG_BRIDGED_PKT;
323 __net_timestamp(skb_uap);
324 mwifiex_wmm_add_buf_txqueue(priv, skb_uap);
325 atomic_inc(&adapter->tx_pending);
326 atomic_inc(&adapter->pending_bridged_pkts);
327 if ((atomic_read(&adapter->pending_bridged_pkts) >=
328 MWIFIEX_BRIDGED_PKTS_THR_HIGH)) {
329 mwifiex_dbg(adapter, ERROR,
330 "Tx: Bridge packet limit reached. Drop packet!\n");
331 mwifiex_uap_cleanup_tx_queues(priv);
332 }
333
334 } else {
335 mwifiex_dbg(adapter, ERROR, "failed to allocate skb_uap");
336 }
337
338 mwifiex_queue_main_work(adapter);
339 /* Don't forward Intra-BSS unicast packet to upper layer*/
340 if (mwifiex_get_sta_entry(priv, p_ethhdr->h_dest))
341 return 0;
342 }
343
344 skb->dev = priv->netdev;
345 skb->protocol = eth_type_trans(skb, priv->netdev);
346 skb->ip_summed = CHECKSUM_NONE;
347
348 /* This is required only in case of 11n and USB/PCIE as we alloc
349 * a buffer of 4K only if its 11N (to be able to receive 4K
350 * AMSDU packets). In case of SD we allocate buffers based
351 * on the size of packet and hence this is not needed.
352 *
353 * Modifying the truesize here as our allocation for each
354 * skb is 4K but we only receive 2K packets and this cause
355 * the kernel to start dropping packets in case where
356 * application has allocated buffer based on 2K size i.e.
357 * if there a 64K packet received (in IP fragments and
358 * application allocates 64K to receive this packet but
359 * this packet would almost double up because we allocate
360 * each 1.5K fragment in 4K and pass it up. As soon as the
361 * 64K limit hits kernel will start to drop rest of the
362 * fragments. Currently we fail the Filesndl-ht.scr script
363 * for UDP, hence this fix
364 */
365 if ((adapter->iface_type == MWIFIEX_USB ||
366 adapter->iface_type == MWIFIEX_PCIE) &&
367 skb->truesize > MWIFIEX_RX_DATA_BUF_SIZE)
368 skb->truesize += (skb->len - MWIFIEX_RX_DATA_BUF_SIZE);
369
370 /* Forward multicast/broadcast packet to upper layer*/
371 netif_rx_any_context(skb);
372 return 0;
373 }
374
375 /*
376 * This function processes the packet received on AP interface.
377 *
378 * The function looks into the RxPD and performs sanity tests on the
379 * received buffer to ensure its a valid packet before processing it
380 * further. If the packet is determined to be aggregated, it is
381 * de-aggregated accordingly. Then skb is passed to AP packet forwarding logic.
382 *
383 * The completion callback is called after processing is complete.
384 */
mwifiex_process_uap_rx_packet(struct mwifiex_private * priv,struct sk_buff * skb)385 int mwifiex_process_uap_rx_packet(struct mwifiex_private *priv,
386 struct sk_buff *skb)
387 {
388 struct mwifiex_adapter *adapter = priv->adapter;
389 int ret;
390 struct uap_rxpd *uap_rx_pd;
391 struct rx_packet_hdr *rx_pkt_hdr;
392 u16 rx_pkt_type;
393 u8 ta[ETH_ALEN], pkt_type;
394 struct mwifiex_sta_node *node;
395
396 uap_rx_pd = (struct uap_rxpd *)(skb->data);
397 rx_pkt_type = le16_to_cpu(uap_rx_pd->rx_pkt_type);
398 rx_pkt_hdr = (void *)uap_rx_pd + le16_to_cpu(uap_rx_pd->rx_pkt_offset);
399
400 if (le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
401 sizeof(rx_pkt_hdr->eth803_hdr) > skb->len) {
402 mwifiex_dbg(adapter, ERROR,
403 "wrong rx packet for struct ethhdr: len=%d, offset=%d\n",
404 skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset));
405 priv->stats.rx_dropped++;
406 dev_kfree_skb_any(skb);
407 return 0;
408 }
409
410 ether_addr_copy(ta, rx_pkt_hdr->eth803_hdr.h_source);
411
412 if ((le16_to_cpu(uap_rx_pd->rx_pkt_offset) +
413 le16_to_cpu(uap_rx_pd->rx_pkt_length)) > (u16) skb->len) {
414 mwifiex_dbg(adapter, ERROR,
415 "wrong rx packet: len=%d, offset=%d, length=%d\n",
416 skb->len, le16_to_cpu(uap_rx_pd->rx_pkt_offset),
417 le16_to_cpu(uap_rx_pd->rx_pkt_length));
418 priv->stats.rx_dropped++;
419
420 node = mwifiex_get_sta_entry(priv, ta);
421 if (node)
422 node->stats.tx_failed++;
423
424 dev_kfree_skb_any(skb);
425 return 0;
426 }
427
428 if (rx_pkt_type == PKT_TYPE_MGMT) {
429 ret = mwifiex_process_mgmt_packet(priv, skb);
430 if (ret)
431 mwifiex_dbg(adapter, DATA, "Rx of mgmt packet failed");
432 dev_kfree_skb_any(skb);
433 return ret;
434 }
435
436
437 if (rx_pkt_type != PKT_TYPE_BAR && uap_rx_pd->priority < MAX_NUM_TID) {
438 spin_lock_bh(&priv->sta_list_spinlock);
439 node = mwifiex_get_sta_entry(priv, ta);
440 if (node)
441 node->rx_seq[uap_rx_pd->priority] =
442 le16_to_cpu(uap_rx_pd->seq_num);
443 spin_unlock_bh(&priv->sta_list_spinlock);
444 }
445
446 if (!priv->ap_11n_enabled ||
447 (!mwifiex_11n_get_rx_reorder_tbl(priv, uap_rx_pd->priority, ta) &&
448 (le16_to_cpu(uap_rx_pd->rx_pkt_type) != PKT_TYPE_AMSDU))) {
449 ret = mwifiex_handle_uap_rx_forward(priv, skb);
450 return ret;
451 }
452
453 /* Reorder and send to kernel */
454 pkt_type = (u8)le16_to_cpu(uap_rx_pd->rx_pkt_type);
455 ret = mwifiex_11n_rx_reorder_pkt(priv, le16_to_cpu(uap_rx_pd->seq_num),
456 uap_rx_pd->priority, ta, pkt_type,
457 skb);
458
459 if (ret || (rx_pkt_type == PKT_TYPE_BAR))
460 dev_kfree_skb_any(skb);
461
462 if (ret)
463 priv->stats.rx_dropped++;
464
465 return ret;
466 }
467
468 /*
469 * This function fills the TxPD for AP tx packets.
470 *
471 * The Tx buffer received by this function should already have the
472 * header space allocated for TxPD.
473 *
474 * This function inserts the TxPD in between interface header and actual
475 * data and adjusts the buffer pointers accordingly.
476 *
477 * The following TxPD fields are set by this function, as required -
478 * - BSS number
479 * - Tx packet length and offset
480 * - Priority
481 * - Packet delay
482 * - Priority specific Tx control
483 * - Flags
484 */
mwifiex_process_uap_txpd(struct mwifiex_private * priv,struct sk_buff * skb)485 void *mwifiex_process_uap_txpd(struct mwifiex_private *priv,
486 struct sk_buff *skb)
487 {
488 struct mwifiex_adapter *adapter = priv->adapter;
489 struct uap_txpd *txpd;
490 struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
491 int pad;
492 u16 pkt_type, pkt_offset;
493 int hroom = adapter->intf_hdr_len;
494
495 if (!skb->len) {
496 mwifiex_dbg(adapter, ERROR,
497 "Tx: bad packet length: %d\n", skb->len);
498 tx_info->status_code = -1;
499 return skb->data;
500 }
501
502 BUG_ON(skb_headroom(skb) < MWIFIEX_MIN_DATA_HEADER_LEN);
503
504 pkt_type = mwifiex_is_skb_mgmt_frame(skb) ? PKT_TYPE_MGMT : 0;
505
506 pad = ((void *)skb->data - (sizeof(*txpd) + hroom) - NULL) &
507 (MWIFIEX_DMA_ALIGN_SZ - 1);
508
509 skb_push(skb, sizeof(*txpd) + pad);
510
511 txpd = (struct uap_txpd *)skb->data;
512 memset(txpd, 0, sizeof(*txpd));
513 txpd->bss_num = priv->bss_num;
514 txpd->bss_type = priv->bss_type;
515 txpd->tx_pkt_length = cpu_to_le16((u16)(skb->len - (sizeof(*txpd) +
516 pad)));
517 txpd->priority = (u8)skb->priority;
518
519 txpd->pkt_delay_2ms = mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
520
521 if (tx_info->flags & MWIFIEX_BUF_FLAG_EAPOL_TX_STATUS ||
522 tx_info->flags & MWIFIEX_BUF_FLAG_ACTION_TX_STATUS) {
523 txpd->tx_token_id = tx_info->ack_frame_id;
524 txpd->flags |= MWIFIEX_TXPD_FLAGS_REQ_TX_STATUS;
525 }
526
527 if (txpd->priority < ARRAY_SIZE(priv->wmm.user_pri_pkt_tx_ctrl))
528 /*
529 * Set the priority specific tx_control field, setting of 0 will
530 * cause the default value to be used later in this function.
531 */
532 txpd->tx_control =
533 cpu_to_le32(priv->wmm.user_pri_pkt_tx_ctrl[txpd->priority]);
534
535 /* Offset of actual data */
536 pkt_offset = sizeof(*txpd) + pad;
537 if (pkt_type == PKT_TYPE_MGMT) {
538 /* Set the packet type and add header for management frame */
539 txpd->tx_pkt_type = cpu_to_le16(pkt_type);
540 pkt_offset += MWIFIEX_MGMT_FRAME_HEADER_SIZE;
541 }
542
543 txpd->tx_pkt_offset = cpu_to_le16(pkt_offset);
544
545 /* make space for adapter->intf_hdr_len */
546 skb_push(skb, hroom);
547
548 if (!txpd->tx_control)
549 /* TxCtrl set by user or default */
550 txpd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
551
552 return skb->data;
553 }
554