1 /******************************************************************************
4 * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
5 * Linux device driver for RTL8192SU
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * You should have received a copy of the GNU General Public License along with
17 * this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
20 * Modifications for inclusion into the Linux staging tree are
21 * Copyright(c) 2010 Larry Finger. All rights reserved.
23 * Contact information:
24 * WLAN FAE <wlanfae@realtek.com>
25 * Larry Finger <Larry.Finger@lwfinger.net>
27 ******************************************************************************/
29 #define _RTL8712_RECV_C_
31 #include <linux/if_ether.h>
34 #include "osdep_service.h"
35 #include "drv_types.h"
36 #include "recv_osdep.h"
37 #include "mlme_osdep.h"
42 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
43 static u8 bridge_tunnel_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8};
45 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
46 static u8 rfc1042_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
48 static void recv_tasklet(void *priv);
50 int r8712_init_recv_priv(struct recv_priv *precvpriv, struct _adapter *padapter)
53 struct recv_buf *precvbuf;
57 struct sk_buff *pskb = NULL;
60 _init_queue(&precvpriv->free_recv_buf_queue);
61 precvpriv->pallocated_recv_buf = kzalloc(NR_RECVBUFF * sizeof(struct recv_buf) + 4,
63 if (precvpriv->pallocated_recv_buf == NULL)
65 precvpriv->precv_buf = precvpriv->pallocated_recv_buf + 4 -
66 ((addr_t) (precvpriv->pallocated_recv_buf) & 3);
67 precvbuf = (struct recv_buf *)precvpriv->precv_buf;
68 for (i = 0; i < NR_RECVBUFF; i++) {
69 INIT_LIST_HEAD(&precvbuf->list);
70 spin_lock_init(&precvbuf->recvbuf_lock);
71 res = r8712_os_recvbuf_resource_alloc(padapter, precvbuf);
74 precvbuf->ref_cnt = 0;
75 precvbuf->adapter = padapter;
76 list_add_tail(&precvbuf->list,
77 &(precvpriv->free_recv_buf_queue.queue));
80 precvpriv->free_recv_buf_queue_cnt = NR_RECVBUFF;
81 tasklet_init(&precvpriv->recv_tasklet,
82 (void(*)(unsigned long))recv_tasklet,
83 (unsigned long)padapter);
84 skb_queue_head_init(&precvpriv->rx_skb_queue);
86 skb_queue_head_init(&precvpriv->free_recv_skb_queue);
87 for (i = 0; i < NR_PREALLOC_RECV_SKB; i++) {
88 pskb = netdev_alloc_skb(padapter->pnetdev, MAX_RECVBUF_SZ +
91 tmpaddr = (addr_t)pskb->data;
92 alignment = tmpaddr & (RECVBUFF_ALIGN_SZ-1);
93 skb_reserve(pskb, (RECVBUFF_ALIGN_SZ - alignment));
94 skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
101 void r8712_free_recv_priv(struct recv_priv *precvpriv)
104 struct recv_buf *precvbuf;
105 struct _adapter *padapter = precvpriv->adapter;
107 precvbuf = (struct recv_buf *)precvpriv->precv_buf;
108 for (i = 0; i < NR_RECVBUFF; i++) {
109 r8712_os_recvbuf_resource_free(padapter, precvbuf);
112 kfree(precvpriv->pallocated_recv_buf);
113 skb_queue_purge(&precvpriv->rx_skb_queue);
114 if (skb_queue_len(&precvpriv->rx_skb_queue))
115 netdev_warn(padapter->pnetdev, "r8712u: rx_skb_queue not empty\n");
116 skb_queue_purge(&precvpriv->free_recv_skb_queue);
117 if (skb_queue_len(&precvpriv->free_recv_skb_queue))
118 netdev_warn(padapter->pnetdev, "r8712u: free_recv_skb_queue not empty %d\n",
119 skb_queue_len(&precvpriv->free_recv_skb_queue));
122 int r8712_init_recvbuf(struct _adapter *padapter, struct recv_buf *precvbuf)
124 precvbuf->transfer_len = 0;
126 precvbuf->ref_cnt = 0;
127 if (precvbuf->pbuf) {
128 precvbuf->pdata = precvbuf->pbuf;
129 precvbuf->phead = precvbuf->pbuf;
130 precvbuf->ptail = precvbuf->pbuf;
131 precvbuf->pend = precvbuf->pdata + MAX_RECVBUF_SZ;
136 int r8712_free_recvframe(union recv_frame *precvframe,
137 struct __queue *pfree_recv_queue)
140 struct _adapter *padapter = precvframe->u.hdr.adapter;
141 struct recv_priv *precvpriv = &padapter->recvpriv;
143 if (precvframe->u.hdr.pkt) {
144 dev_kfree_skb_any(precvframe->u.hdr.pkt);/*free skb by driver*/
145 precvframe->u.hdr.pkt = NULL;
147 spin_lock_irqsave(&pfree_recv_queue->lock, irqL);
148 list_del_init(&(precvframe->u.hdr.list));
149 list_add_tail(&(precvframe->u.hdr.list), &pfree_recv_queue->queue);
150 if (padapter != NULL) {
151 if (pfree_recv_queue == &precvpriv->free_recv_queue)
152 precvpriv->free_recvframe_cnt++;
154 spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL);
158 static void update_recvframe_attrib_from_recvstat(struct rx_pkt_attrib *pattrib,
159 struct recv_stat *prxstat)
162 struct phy_stat *pphy_stat;
165 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0)&0x000f0000)>>16;
166 drvinfo_sz = drvinfo_sz<<3;
169 pattrib->bdecrypted = ((le32_to_cpu(prxstat->rxdw0) & BIT(27)) >> 27)
171 pattrib->crc_err = ((le32_to_cpu(prxstat->rxdw0) & BIT(14)) >> 14);
175 if (le32_to_cpu(prxstat->rxdw3) & BIT(13)) {
176 pattrib->tcpchk_valid = 1; /* valid */
177 if (le32_to_cpu(prxstat->rxdw3) & BIT(11))
178 pattrib->tcp_chkrpt = 1; /* correct */
180 pattrib->tcp_chkrpt = 0; /* incorrect */
181 if (le32_to_cpu(prxstat->rxdw3) & BIT(12))
182 pattrib->ip_chkrpt = 1; /* correct */
184 pattrib->ip_chkrpt = 0; /* incorrect */
186 pattrib->tcpchk_valid = 0; /* invalid */
187 pattrib->mcs_rate = (u8)((le32_to_cpu(prxstat->rxdw3)) & 0x3f);
188 pattrib->htc = (u8)((le32_to_cpu(prxstat->rxdw3) >> 14) & 0x1);
193 pphy_stat = (struct phy_stat *)(prxstat+1);
194 pphy_info = (u32 *)prxstat+1;
199 static union recv_frame *recvframe_defrag(struct _adapter *adapter,
200 struct __queue *defrag_q)
202 struct list_head *plist, *phead;
203 u8 *data, wlanhdr_offset;
205 struct recv_frame_hdr *pfhdr, *pnfhdr;
206 union recv_frame *prframe, *pnextrframe;
207 struct __queue *pfree_recv_queue;
209 pfree_recv_queue = &adapter->recvpriv.free_recv_queue;
210 phead = &defrag_q->queue;
212 prframe = LIST_CONTAINOR(plist, union recv_frame, u);
213 list_del_init(&prframe->u.list);
214 pfhdr = &prframe->u.hdr;
216 if (curfragnum != pfhdr->attrib.frag_num) {
217 /*the first fragment number must be 0
218 *free the whole queue*/
219 r8712_free_recvframe(prframe, pfree_recv_queue);
220 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
224 plist = &defrag_q->queue;
226 data = get_recvframe_data(prframe);
227 while (end_of_queue_search(phead, plist) == false) {
228 pnextrframe = LIST_CONTAINOR(plist, union recv_frame, u);
229 pnfhdr = &pnextrframe->u.hdr;
230 /*check the fragment sequence (2nd ~n fragment frame) */
231 if (curfragnum != pnfhdr->attrib.frag_num) {
232 /* the fragment number must increase (after decache)
233 * release the defrag_q & prframe */
234 r8712_free_recvframe(prframe, pfree_recv_queue);
235 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
239 /* copy the 2nd~n fragment frame's payload to the first fragment
240 * get the 2nd~last fragment frame's payload */
241 wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len;
242 recvframe_pull(pnextrframe, wlanhdr_offset);
243 /* append to first fragment frame's tail (if privacy frame,
245 recvframe_pull_tail(prframe, pfhdr->attrib.icv_len);
246 memcpy(pfhdr->rx_tail, pnfhdr->rx_data, pnfhdr->len);
247 recvframe_put(prframe, pnfhdr->len);
248 pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len;
251 /* free the defrag_q queue and return the prframe */
252 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
256 /* check if need to defrag, if needed queue the frame to defrag_q */
257 union recv_frame *r8712_recvframe_chk_defrag(struct _adapter *padapter,
258 union recv_frame *precv_frame)
263 struct recv_frame_hdr *pfhdr;
264 struct sta_info *psta;
265 struct sta_priv *pstapriv;
266 struct list_head *phead;
267 union recv_frame *prtnframe = NULL;
268 struct __queue *pfree_recv_queue, *pdefrag_q;
270 pstapriv = &padapter->stapriv;
271 pfhdr = &precv_frame->u.hdr;
272 pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
273 /* need to define struct of wlan header frame ctrl */
274 ismfrag = pfhdr->attrib.mfrag;
275 fragnum = pfhdr->attrib.frag_num;
276 psta_addr = pfhdr->attrib.ta;
277 psta = r8712_get_stainfo(pstapriv, psta_addr);
281 pdefrag_q = &psta->sta_recvpriv.defrag_q;
283 if ((ismfrag == 0) && (fragnum == 0))
284 prtnframe = precv_frame;/*isn't a fragment frame*/
286 /* 0~(n-1) fragment frame
287 * enqueue to defraf_g */
288 if (pdefrag_q != NULL) {
290 /*the first fragment*/
291 if (!list_empty(&pdefrag_q->queue)) {
292 /*free current defrag_q */
293 r8712_free_recvframe_queue(pdefrag_q,
297 /* Then enqueue the 0~(n-1) fragment to the defrag_q */
298 phead = &pdefrag_q->queue;
299 list_add_tail(&pfhdr->list, phead);
302 /* can't find this ta's defrag_queue, so free this
304 r8712_free_recvframe(precv_frame, pfree_recv_queue);
309 if ((ismfrag == 0) && (fragnum != 0)) {
310 /* the last fragment frame
311 * enqueue the last fragment */
312 if (pdefrag_q != NULL) {
313 phead = &pdefrag_q->queue;
314 list_add_tail(&pfhdr->list, phead);
315 /*call recvframe_defrag to defrag*/
316 precv_frame = recvframe_defrag(padapter, pdefrag_q);
317 prtnframe = precv_frame;
319 /* can't find this ta's defrag_queue, so free this
321 r8712_free_recvframe(precv_frame, pfree_recv_queue);
325 if ((prtnframe != NULL) && (prtnframe->u.hdr.attrib.privacy)) {
326 /* after defrag we must check tkip mic code */
327 if (r8712_recvframe_chkmic(padapter, prtnframe) == _FAIL) {
328 r8712_free_recvframe(prtnframe, pfree_recv_queue);
335 static int amsdu_to_msdu(struct _adapter *padapter, union recv_frame *prframe)
337 int a_len, padding_len;
338 u16 eth_type, nSubframe_Length;
340 unsigned char *data_ptr, *pdata;
341 struct rx_pkt_attrib *pattrib;
342 _pkt *sub_skb, *subframes[MAX_SUBFRAME_COUNT];
343 struct recv_priv *precvpriv = &padapter->recvpriv;
344 struct __queue *pfree_recv_queue = &(precvpriv->free_recv_queue);
347 pattrib = &prframe->u.hdr.attrib;
348 recvframe_pull(prframe, prframe->u.hdr.attrib.hdrlen);
349 if (prframe->u.hdr.attrib.iv_len > 0)
350 recvframe_pull(prframe, prframe->u.hdr.attrib.iv_len);
351 a_len = prframe->u.hdr.len;
352 pdata = prframe->u.hdr.rx_data;
353 while (a_len > ETH_HLEN) {
354 /* Offset 12 denote 2 mac address */
355 nSubframe_Length = *((u16 *)(pdata + 12));
356 /*==m==>change the length order*/
357 nSubframe_Length = (nSubframe_Length >> 8) +
358 (nSubframe_Length << 8);
359 if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
360 netdev_warn(padapter->pnetdev, "r8712u: nRemain_Length is %d and nSubframe_Length is: %d\n",
361 a_len, nSubframe_Length);
364 /* move the data point to data content */
367 /* Allocate new skb for releasing to upper layer */
368 sub_skb = dev_alloc_skb(nSubframe_Length + 12);
371 skb_reserve(sub_skb, 12);
372 data_ptr = (u8 *)skb_put(sub_skb, nSubframe_Length);
373 memcpy(data_ptr, pdata, nSubframe_Length);
374 subframes[nr_subframes++] = sub_skb;
375 if (nr_subframes >= MAX_SUBFRAME_COUNT) {
376 netdev_warn(padapter->pnetdev, "r8712u: ParseSubframe(): Too many Subframes! Packets dropped!\n");
379 pdata += nSubframe_Length;
380 a_len -= nSubframe_Length;
382 padding_len = 4 - ((nSubframe_Length + ETH_HLEN) & 3);
383 if (padding_len == 4)
385 if (a_len < padding_len)
387 pdata += padding_len;
388 a_len -= padding_len;
391 for (i = 0; i < nr_subframes; i++) {
392 sub_skb = subframes[i];
393 /* convert hdr + possible LLC headers into Ethernet header */
394 eth_type = (sub_skb->data[6] << 8) | sub_skb->data[7];
395 if (sub_skb->len >= 8 &&
396 ((!memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) &&
397 eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) ||
398 !memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE))) {
399 /* remove RFC1042 or Bridge-Tunnel encapsulation and
400 * replace EtherType */
401 skb_pull(sub_skb, SNAP_SIZE);
402 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
404 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
408 /* Leave Ethernet header part of hdr and full payload */
409 len = htons(sub_skb->len);
410 memcpy(skb_push(sub_skb, 2), &len, 2);
411 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
413 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
416 /* Indicate the packets to upper layer */
419 eth_type_trans(sub_skb, padapter->pnetdev);
420 sub_skb->dev = padapter->pnetdev;
421 if ((pattrib->tcpchk_valid == 1) &&
422 (pattrib->tcp_chkrpt == 1)) {
423 sub_skb->ip_summed = CHECKSUM_UNNECESSARY;
425 sub_skb->ip_summed = CHECKSUM_NONE;
430 prframe->u.hdr.len = 0;
431 r8712_free_recvframe(prframe, pfree_recv_queue);
435 void r8712_rxcmd_event_hdl(struct _adapter *padapter, void *prxcmdbuf)
439 u16 pkt_len, cmd_len, drvinfo_sz;
441 struct recv_stat *prxstat;
443 poffset = (u8 *)prxcmdbuf;
444 voffset = *(uint *)poffset;
445 pkt_len = le32_to_cpu(voffset) & 0x00003fff;
446 prxstat = (struct recv_stat *)prxcmdbuf;
447 drvinfo_sz = ((le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16);
448 drvinfo_sz = drvinfo_sz << 3;
449 poffset += RXDESC_SIZE + drvinfo_sz;
451 voffset = *(uint *)poffset;
452 cmd_len = (u16)(le32_to_cpu(voffset) & 0xffff);
453 cmd_seq = (u8)((le32_to_cpu(voffset) >> 24) & 0x7f);
454 eid = (u8)((le32_to_cpu(voffset) >> 16) & 0xff);
455 r8712_event_handle(padapter, (uint *)poffset);
456 poffset += (cmd_len + 8);/*8 bytes alignment*/
457 } while (le32_to_cpu(voffset) & BIT(31));
461 static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl,
464 u8 wsize = preorder_ctrl->wsize_b;
465 u16 wend = (preorder_ctrl->indicate_seq + wsize - 1) % 4096;
467 /* Rx Reorder initialize condition.*/
468 if (preorder_ctrl->indicate_seq == 0xffff)
469 preorder_ctrl->indicate_seq = seq_num;
470 /* Drop out the packet which SeqNum is smaller than WinStart */
471 if (SN_LESS(seq_num, preorder_ctrl->indicate_seq))
474 * Sliding window manipulation. Conditions includes:
475 * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
476 * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
478 if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq))
479 preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq +
481 else if (SN_LESS(wend, seq_num)) {
482 if (seq_num >= (wsize - 1))
483 preorder_ctrl->indicate_seq = seq_num + 1 - wsize;
485 preorder_ctrl->indicate_seq = 4095 - (wsize -
491 static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl,
492 union recv_frame *prframe)
494 struct list_head *phead, *plist;
495 union recv_frame *pnextrframe;
496 struct rx_pkt_attrib *pnextattrib;
497 struct __queue *ppending_recvframe_queue =
498 &preorder_ctrl->pending_recvframe_queue;
499 struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
501 phead = &ppending_recvframe_queue->queue;
503 while (end_of_queue_search(phead, plist) == false) {
504 pnextrframe = LIST_CONTAINOR(plist, union recv_frame, u);
505 pnextattrib = &pnextrframe->u.hdr.attrib;
506 if (SN_LESS(pnextattrib->seq_num, pattrib->seq_num))
508 else if (SN_EQUAL(pnextattrib->seq_num, pattrib->seq_num))
513 list_del_init(&(prframe->u.hdr.list));
514 list_add_tail(&(prframe->u.hdr.list), plist);
518 int r8712_recv_indicatepkts_in_order(struct _adapter *padapter,
519 struct recv_reorder_ctrl *preorder_ctrl,
522 struct list_head *phead, *plist;
523 union recv_frame *prframe;
524 struct rx_pkt_attrib *pattrib;
525 int bPktInBuf = false;
526 struct recv_priv *precvpriv = &padapter->recvpriv;
527 struct __queue *ppending_recvframe_queue =
528 &preorder_ctrl->pending_recvframe_queue;
530 phead = &ppending_recvframe_queue->queue;
532 /* Handling some condition for forced indicate case.*/
533 if (bforced == true) {
534 if (list_empty(phead))
537 prframe = LIST_CONTAINOR(plist, union recv_frame, u);
538 pattrib = &prframe->u.hdr.attrib;
539 preorder_ctrl->indicate_seq = pattrib->seq_num;
542 /* Prepare indication list and indication.
543 * Check if there is any packet need indicate. */
544 while (!list_empty(phead)) {
545 prframe = LIST_CONTAINOR(plist, union recv_frame, u);
546 pattrib = &prframe->u.hdr.attrib;
547 if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) {
549 list_del_init(&(prframe->u.hdr.list));
550 if (SN_EQUAL(preorder_ctrl->indicate_seq,
552 preorder_ctrl->indicate_seq =
553 (preorder_ctrl->indicate_seq + 1) % 4096;
554 /*indicate this recv_frame*/
555 if (!pattrib->amsdu) {
556 if ((padapter->bDriverStopped == false) &&
557 (padapter->bSurpriseRemoved == false)) {
558 /* indicate this recv_frame */
559 r8712_recv_indicatepkt(padapter,
562 } else if (pattrib->amsdu == 1) {
563 if (amsdu_to_msdu(padapter, prframe) !=
565 r8712_free_recvframe(prframe,
566 &precvpriv->free_recv_queue);
568 /* Update local variables. */
578 static int recv_indicatepkt_reorder(struct _adapter *padapter,
579 union recv_frame *prframe)
582 struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
583 struct recv_reorder_ctrl *preorder_ctrl = prframe->u.hdr.preorder_ctrl;
584 struct __queue *ppending_recvframe_queue =
585 &preorder_ctrl->pending_recvframe_queue;
587 if (!pattrib->amsdu) {
589 r8712_wlanhdr_to_ethhdr(prframe);
590 if (pattrib->qos != 1) {
591 if ((padapter->bDriverStopped == false) &&
592 (padapter->bSurpriseRemoved == false)) {
593 r8712_recv_indicatepkt(padapter, prframe);
599 spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
600 /*s2. check if winstart_b(indicate_seq) needs to be updated*/
601 if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num))
603 /*s3. Insert all packet into Reorder Queue to maintain its ordering.*/
604 if (!enqueue_reorder_recvframe(preorder_ctrl, prframe))
607 * Indication process.
608 * After Packet dropping and Sliding Window shifting as above, we can
609 * now just indicate the packets with the SeqNum smaller than latest
610 * WinStart and buffer other packets.
612 * For Rx Reorder condition:
613 * 1. All packets with SeqNum smaller than WinStart => Indicate
614 * 2. All packets with SeqNum larger than or equal to
615 * WinStart => Buffer it.
617 if (r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, false) ==
619 _set_timer(&preorder_ctrl->reordering_ctrl_timer,
621 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
623 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
624 _cancel_timer_ex(&preorder_ctrl->reordering_ctrl_timer);
628 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
632 void r8712_reordering_ctrl_timeout_handler(void *pcontext)
635 struct recv_reorder_ctrl *preorder_ctrl =
636 (struct recv_reorder_ctrl *)pcontext;
637 struct _adapter *padapter = preorder_ctrl->padapter;
638 struct __queue *ppending_recvframe_queue =
639 &preorder_ctrl->pending_recvframe_queue;
641 if (padapter->bDriverStopped || padapter->bSurpriseRemoved)
643 spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
644 r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, true);
645 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
648 static int r8712_process_recv_indicatepkts(struct _adapter *padapter,
649 union recv_frame *prframe)
651 int retval = _SUCCESS;
652 struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
653 struct ht_priv *phtpriv = &pmlmepriv->htpriv;
655 if (phtpriv->ht_option == 1) { /*B/G/N Mode*/
656 if (recv_indicatepkt_reorder(padapter, prframe) != _SUCCESS) {
657 /* including perform A-MPDU Rx Ordering Buffer Control*/
658 if ((padapter->bDriverStopped == false) &&
659 (padapter->bSurpriseRemoved == false))
662 } else { /*B/G mode*/
663 retval = r8712_wlanhdr_to_ethhdr(prframe);
664 if (retval != _SUCCESS)
666 if ((padapter->bDriverStopped == false) &&
667 (padapter->bSurpriseRemoved == false)) {
668 /* indicate this recv_frame */
669 r8712_recv_indicatepkt(padapter, prframe);
676 static u8 query_rx_pwr_percentage(s8 antpower)
678 if ((antpower <= -100) || (antpower >= 20))
680 else if (antpower >= 0)
683 return 100 + antpower;
686 static u8 evm_db2percentage(s8 value)
689 * -33dB~0dB to 0%~99%
705 s32 r8712_signal_scale_mapping(s32 cur_sig)
709 if (cur_sig >= 51 && cur_sig <= 100)
711 else if (cur_sig >= 41 && cur_sig <= 50)
712 ret_sig = 80 + ((cur_sig - 40) * 2);
713 else if (cur_sig >= 31 && cur_sig <= 40)
714 ret_sig = 66 + (cur_sig - 30);
715 else if (cur_sig >= 21 && cur_sig <= 30)
716 ret_sig = 54 + (cur_sig - 20);
717 else if (cur_sig >= 10 && cur_sig <= 20)
718 ret_sig = 42 + (((cur_sig - 10) * 2) / 3);
719 else if (cur_sig >= 5 && cur_sig <= 9)
720 ret_sig = 22 + (((cur_sig - 5) * 3) / 2);
721 else if (cur_sig >= 1 && cur_sig <= 4)
722 ret_sig = 6 + (((cur_sig - 1) * 3) / 2);
728 static s32 translate2dbm(struct _adapter *padapter, u8 signal_strength_idx)
730 s32 signal_power; /* in dBm.*/
731 /* Translate to dBm (x=0.5y-95).*/
732 signal_power = (s32)((signal_strength_idx + 1) >> 1);
737 static void query_rx_phy_status(struct _adapter *padapter,
738 union recv_frame *prframe)
740 u8 i, max_spatial_stream, evm;
741 struct recv_stat *prxstat = (struct recv_stat *)prframe->u.hdr.rx_head;
742 struct phy_stat *pphy_stat = (struct phy_stat *)(prxstat + 1);
743 u8 *pphy_head = (u8 *)(prxstat + 1);
744 s8 rx_pwr[4], rx_pwr_all;
746 u32 rssi, total_rssi = 0;
747 u8 bcck_rate = 0, rf_rx_num = 0, cck_highpwr = 0;
748 struct phy_cck_rx_status *pcck_buf;
751 /* Record it for next packet processing*/
752 bcck_rate = (prframe->u.hdr.attrib.mcs_rate <= 3 ? 1 : 0);
756 /* CCK Driver info Structure is not the same as OFDM packet.*/
757 pcck_buf = (struct phy_cck_rx_status *)pphy_stat;
758 /* (1)Hardware does not provide RSSI for CCK
759 * (2)PWDB, Average PWDB cacluated by hardware
760 * (for rate adaptive)
763 report = pcck_buf->cck_agc_rpt & 0xc0;
764 report = report >> 6;
766 /* Modify the RF RNA gain value to -40, -20,
767 * -2, 14 by Jenyu's suggestion
768 * Note: different RF with the different
771 rx_pwr_all = -40 - (pcck_buf->cck_agc_rpt &
775 rx_pwr_all = -20 - (pcck_buf->cck_agc_rpt &
779 rx_pwr_all = -2 - (pcck_buf->cck_agc_rpt &
783 rx_pwr_all = 14 - (pcck_buf->cck_agc_rpt &
788 report = ((u8)(le32_to_cpu(pphy_stat->phydw1) >> 8)) &
790 report = report >> 5;
793 rx_pwr_all = -40 - ((pcck_buf->cck_agc_rpt &
797 rx_pwr_all = -20 - ((pcck_buf->cck_agc_rpt &
801 rx_pwr_all = -2 - ((pcck_buf->cck_agc_rpt &
805 rx_pwr_all = 14 - ((pcck_buf->cck_agc_rpt &
810 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
811 /* CCK gain is smaller than OFDM/MCS gain,*/
812 /* so we add gain diff by experiences, the val is 6 */
816 /* modify the offset to make the same gain index with OFDM.*/
817 if (pwdb_all > 34 && pwdb_all <= 42)
819 else if (pwdb_all > 26 && pwdb_all <= 34)
821 else if (pwdb_all > 14 && pwdb_all <= 26)
823 else if (pwdb_all > 4 && pwdb_all <= 14)
826 * (3) Get Signal Quality (EVM)
831 sq = pcck_buf->sq_rpt;
832 if (pcck_buf->sq_rpt > 64)
834 else if (pcck_buf->sq_rpt < 20)
837 sq = ((64-sq) * 100) / 44;
839 prframe->u.hdr.attrib.signal_qual = sq;
840 prframe->u.hdr.attrib.rx_mimo_signal_qual[0] = sq;
841 prframe->u.hdr.attrib.rx_mimo_signal_qual[1] = -1;
843 /* (1)Get RSSI for HT rate */
844 for (i = 0; i < ((padapter->registrypriv.rf_config) &
847 rx_pwr[i] = ((pphy_head[PHY_STAT_GAIN_TRSW_SHT + i]
849 /* Translate DBM to percentage. */
850 rssi = query_rx_pwr_percentage(rx_pwr[i]);
853 /* (2)PWDB, Average PWDB cacluated by hardware (for
855 rx_pwr_all = (((pphy_head[PHY_STAT_PWDB_ALL_SHT]) >> 1) & 0x7f)
857 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
860 /* (3)EVM of HT rate */
861 if (prframe->u.hdr.attrib.htc &&
862 prframe->u.hdr.attrib.mcs_rate >= 20 &&
863 prframe->u.hdr.attrib.mcs_rate <= 27) {
864 /* both spatial stream make sense */
865 max_spatial_stream = 2;
867 /* only spatial stream 1 makes sense */
868 max_spatial_stream = 1;
870 for (i = 0; i < max_spatial_stream; i++) {
871 evm = evm_db2percentage((pphy_head
872 [PHY_STAT_RXEVM_SHT + i]));/*dbm*/
873 prframe->u.hdr.attrib.signal_qual =
875 prframe->u.hdr.attrib.rx_mimo_signal_qual[i] =
880 /* UI BSS List signal strength(in percentage), make it good looking,
881 * from 0~100. It is assigned to the BSS List in
882 * GetValueFromBeaconOrProbeRsp(). */
884 prframe->u.hdr.attrib.signal_strength =
885 (u8)r8712_signal_scale_mapping(pwdb_all);
888 prframe->u.hdr.attrib.signal_strength =
889 (u8)(r8712_signal_scale_mapping(total_rssi /=
894 static void process_link_qual(struct _adapter *padapter,
895 union recv_frame *prframe)
897 u32 last_evm = 0, tmpVal;
898 struct rx_pkt_attrib *pattrib;
900 if (prframe == NULL || padapter == NULL)
902 pattrib = &prframe->u.hdr.attrib;
903 if (pattrib->signal_qual != 0) {
905 * 1. Record the general EVM to the sliding window.
907 if (padapter->recvpriv.signal_qual_data.total_num++ >=
908 PHY_LINKQUALITY_SLID_WIN_MAX) {
909 padapter->recvpriv.signal_qual_data.total_num =
910 PHY_LINKQUALITY_SLID_WIN_MAX;
911 last_evm = padapter->recvpriv.signal_qual_data.elements
912 [padapter->recvpriv.signal_qual_data.index];
913 padapter->recvpriv.signal_qual_data.total_val -=
916 padapter->recvpriv.signal_qual_data.total_val +=
917 pattrib->signal_qual;
918 padapter->recvpriv.signal_qual_data.elements[padapter->
919 recvpriv.signal_qual_data.index++] =
920 pattrib->signal_qual;
921 if (padapter->recvpriv.signal_qual_data.index >=
922 PHY_LINKQUALITY_SLID_WIN_MAX)
923 padapter->recvpriv.signal_qual_data.index = 0;
925 /* <1> Showed on UI for user, in percentage. */
926 tmpVal = padapter->recvpriv.signal_qual_data.total_val /
927 padapter->recvpriv.signal_qual_data.total_num;
928 padapter->recvpriv.signal = (u8)tmpVal;
932 static void process_rssi(struct _adapter *padapter, union recv_frame *prframe)
934 u32 last_rssi, tmp_val;
935 struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
937 if (padapter->recvpriv.signal_strength_data.total_num++ >=
938 PHY_RSSI_SLID_WIN_MAX) {
939 padapter->recvpriv.signal_strength_data.total_num =
940 PHY_RSSI_SLID_WIN_MAX;
941 last_rssi = padapter->recvpriv.signal_strength_data.elements
942 [padapter->recvpriv.signal_strength_data.index];
943 padapter->recvpriv.signal_strength_data.total_val -= last_rssi;
945 padapter->recvpriv.signal_strength_data.total_val +=
946 pattrib->signal_strength;
947 padapter->recvpriv.signal_strength_data.elements[padapter->recvpriv.
948 signal_strength_data.index++] =
949 pattrib->signal_strength;
950 if (padapter->recvpriv.signal_strength_data.index >=
951 PHY_RSSI_SLID_WIN_MAX)
952 padapter->recvpriv.signal_strength_data.index = 0;
953 tmp_val = padapter->recvpriv.signal_strength_data.total_val /
954 padapter->recvpriv.signal_strength_data.total_num;
955 padapter->recvpriv.rssi = (s8)translate2dbm(padapter, (u8)tmp_val);
958 static void process_phy_info(struct _adapter *padapter,
959 union recv_frame *prframe)
961 query_rx_phy_status(padapter, prframe);
962 process_rssi(padapter, prframe);
963 process_link_qual(padapter, prframe);
966 int recv_func(struct _adapter *padapter, void *pcontext)
968 struct rx_pkt_attrib *pattrib;
969 union recv_frame *prframe, *orig_prframe;
970 int retval = _SUCCESS;
971 struct __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
972 struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
974 prframe = (union recv_frame *)pcontext;
975 orig_prframe = prframe;
976 pattrib = &prframe->u.hdr.attrib;
977 if (check_fwstate(pmlmepriv, WIFI_MP_STATE) == true) {
978 if (pattrib->crc_err == 1)
979 padapter->mppriv.rx_crcerrpktcount++;
981 padapter->mppriv.rx_pktcount++;
982 if (check_fwstate(pmlmepriv, WIFI_MP_LPBK_STATE) == false) {
983 /* free this recv_frame */
984 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
985 goto _exit_recv_func;
988 /* check the frame crtl field and decache */
989 retval = r8712_validate_recv_frame(padapter, prframe);
990 if (retval != _SUCCESS) {
991 /* free this recv_frame */
992 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
993 goto _exit_recv_func;
995 process_phy_info(padapter, prframe);
996 prframe = r8712_decryptor(padapter, prframe);
997 if (prframe == NULL) {
999 goto _exit_recv_func;
1001 prframe = r8712_recvframe_chk_defrag(padapter, prframe);
1002 if (prframe == NULL)
1003 goto _exit_recv_func;
1004 prframe = r8712_portctrl(padapter, prframe);
1005 if (prframe == NULL) {
1007 goto _exit_recv_func;
1009 retval = r8712_process_recv_indicatepkts(padapter, prframe);
1010 if (retval != _SUCCESS) {
1011 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
1012 goto _exit_recv_func;
1018 static int recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
1020 u8 *pbuf, shift_sz = 0;
1024 struct recv_stat *prxstat;
1025 u16 pkt_cnt, drvinfo_sz, pkt_offset, tmp_len, alloc_sz;
1026 struct __queue *pfree_recv_queue;
1027 _pkt *pkt_copy = NULL;
1028 union recv_frame *precvframe = NULL;
1029 struct recv_priv *precvpriv = &padapter->recvpriv;
1031 pfree_recv_queue = &(precvpriv->free_recv_queue);
1033 prxstat = (struct recv_stat *)pbuf;
1034 pkt_cnt = (le32_to_cpu(prxstat->rxdw2)>>16)&0xff;
1035 pkt_len = le32_to_cpu(prxstat->rxdw0)&0x00003fff;
1036 transfer_len = pskb->len;
1037 /* Test throughput with Netgear 3700 (No security) with Chariot 3T3R
1038 * pairs. The packet count will be a big number so that the containing
1039 * packet will effect the Rx reordering. */
1040 if (transfer_len < pkt_len) {
1041 /* In this case, it means the MAX_RECVBUF_SZ is too small to
1042 * get the data from 8712u. */
1046 prxstat = (struct recv_stat *)pbuf;
1047 pkt_len = le32_to_cpu(prxstat->rxdw0)&0x00003fff;
1048 /* more fragment bit */
1049 mf = (le32_to_cpu(prxstat->rxdw1) >> 27) & 0x1;
1050 /* ragmentation number */
1051 frag = (le32_to_cpu(prxstat->rxdw2) >> 12) & 0xf;
1052 /* uint 2^3 = 8 bytes */
1053 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
1054 drvinfo_sz = drvinfo_sz<<3;
1056 goto _exit_recvbuf2recvframe;
1057 /* Qos data, wireless lan header length is 26 */
1058 if ((le32_to_cpu(prxstat->rxdw0) >> 23) & 0x01)
1060 precvframe = r8712_alloc_recvframe(pfree_recv_queue);
1061 if (precvframe == NULL)
1062 goto _exit_recvbuf2recvframe;
1063 INIT_LIST_HEAD(&precvframe->u.hdr.list);
1064 precvframe->u.hdr.precvbuf = NULL; /*can't access the precvbuf*/
1065 precvframe->u.hdr.len = 0;
1066 tmp_len = pkt_len + drvinfo_sz + RXDESC_SIZE;
1067 pkt_offset = (u16)round_up(tmp_len, 128);
1068 /* for first fragment packet, driver need allocate 1536 +
1069 * drvinfo_sz + RXDESC_SIZE to defrag packet. */
1070 if ((mf == 1) && (frag == 0))
1071 alloc_sz = 1658;/*1658+6=1664, 1664 is 128 alignment.*/
1074 /* 2 is for IP header 4 bytes alignment in QoS packet case.
1075 * 4 is for skb->data 4 bytes alignment. */
1077 pkt_copy = netdev_alloc_skb(padapter->pnetdev, alloc_sz);
1079 precvframe->u.hdr.pkt = pkt_copy;
1080 skb_reserve(pkt_copy, 4 - ((addr_t)(pkt_copy->data)
1082 skb_reserve(pkt_copy, shift_sz);
1083 memcpy(pkt_copy->data, pbuf, tmp_len);
1084 precvframe->u.hdr.rx_head = precvframe->u.hdr.rx_data =
1085 precvframe->u.hdr.rx_tail = pkt_copy->data;
1086 precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz;
1088 precvframe->u.hdr.pkt = skb_clone(pskb, GFP_ATOMIC);
1089 if (!precvframe->u.hdr.pkt)
1091 precvframe->u.hdr.rx_head = pbuf;
1092 precvframe->u.hdr.rx_data = pbuf;
1093 precvframe->u.hdr.rx_tail = pbuf;
1094 precvframe->u.hdr.rx_end = pbuf + alloc_sz;
1096 recvframe_put(precvframe, tmp_len);
1097 recvframe_pull(precvframe, drvinfo_sz + RXDESC_SIZE);
1098 /* because the endian issue, driver avoid reference to the
1099 * rxstat after calling update_recvframe_attrib_from_recvstat();
1101 update_recvframe_attrib_from_recvstat(&precvframe->u.hdr.attrib,
1103 r8712_recv_entry(precvframe);
1104 transfer_len -= pkt_offset;
1109 } while ((transfer_len > 0) && pkt_cnt > 0);
1110 _exit_recvbuf2recvframe:
1114 static void recv_tasklet(void *priv)
1116 struct sk_buff *pskb;
1117 struct _adapter *padapter = (struct _adapter *)priv;
1118 struct recv_priv *precvpriv = &padapter->recvpriv;
1120 while (NULL != (pskb = skb_dequeue(&precvpriv->rx_skb_queue))) {
1121 recvbuf2recvframe(padapter, pskb);
1122 skb_reset_tail_pointer(pskb);
1124 if (!skb_cloned(pskb))
1125 skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);