1 // SPDX-License-Identifier: GPL-2.0
2 /******************************************************************************
5 * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved.
6 * Linux device driver for RTL8192SU
8 * Modifications for inclusion into the Linux staging tree are
9 * Copyright(c) 2010 Larry Finger. All rights reserved.
11 * Contact information:
12 * WLAN FAE <wlanfae@realtek.com>
13 * Larry Finger <Larry.Finger@lwfinger.net>
15 ******************************************************************************/
17 #define _RTL8712_RECV_C_
19 #include <linux/if_ether.h>
22 #include "osdep_service.h"
23 #include "drv_types.h"
24 #include "recv_osdep.h"
25 #include "mlme_osdep.h"
30 /* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
31 static u8 bridge_tunnel_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8};
33 /* Ethernet-II snap header (RFC1042 for most EtherTypes) */
34 static u8 rfc1042_header[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
36 static void recv_tasklet(void *priv);
38 void r8712_init_recv_priv(struct recv_priv *precvpriv,
39 struct _adapter *padapter)
42 struct recv_buf *precvbuf;
45 struct sk_buff *pskb = NULL;
48 _init_queue(&precvpriv->free_recv_buf_queue);
49 precvpriv->pallocated_recv_buf =
50 kzalloc(NR_RECVBUFF * sizeof(struct recv_buf) + 4, GFP_ATOMIC);
51 if (!precvpriv->pallocated_recv_buf)
53 precvpriv->precv_buf = precvpriv->pallocated_recv_buf + 4 -
54 ((addr_t)(precvpriv->pallocated_recv_buf) & 3);
55 precvbuf = (struct recv_buf *)precvpriv->precv_buf;
56 for (i = 0; i < NR_RECVBUFF; i++) {
57 INIT_LIST_HEAD(&precvbuf->list);
58 spin_lock_init(&precvbuf->recvbuf_lock);
59 if (r8712_os_recvbuf_resource_alloc(padapter, precvbuf))
61 precvbuf->ref_cnt = 0;
62 precvbuf->adapter = padapter;
63 list_add_tail(&precvbuf->list,
64 &(precvpriv->free_recv_buf_queue.queue));
67 precvpriv->free_recv_buf_queue_cnt = NR_RECVBUFF;
68 tasklet_init(&precvpriv->recv_tasklet,
69 (void(*)(unsigned long))recv_tasklet,
70 (unsigned long)padapter);
71 skb_queue_head_init(&precvpriv->rx_skb_queue);
73 skb_queue_head_init(&precvpriv->free_recv_skb_queue);
74 for (i = 0; i < NR_PREALLOC_RECV_SKB; i++) {
75 pskb = netdev_alloc_skb(padapter->pnetdev, MAX_RECVBUF_SZ +
78 tmpaddr = (addr_t)pskb->data;
79 alignment = tmpaddr & (RECVBUFF_ALIGN_SZ - 1);
80 skb_reserve(pskb, (RECVBUFF_ALIGN_SZ - alignment));
81 skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);
87 void r8712_free_recv_priv(struct recv_priv *precvpriv)
90 struct recv_buf *precvbuf;
91 struct _adapter *padapter = precvpriv->adapter;
93 precvbuf = (struct recv_buf *)precvpriv->precv_buf;
94 for (i = 0; i < NR_RECVBUFF; i++) {
95 r8712_os_recvbuf_resource_free(padapter, precvbuf);
98 kfree(precvpriv->pallocated_recv_buf);
99 skb_queue_purge(&precvpriv->rx_skb_queue);
100 if (skb_queue_len(&precvpriv->rx_skb_queue))
101 netdev_warn(padapter->pnetdev, "r8712u: rx_skb_queue not empty\n");
102 skb_queue_purge(&precvpriv->free_recv_skb_queue);
103 if (skb_queue_len(&precvpriv->free_recv_skb_queue))
104 netdev_warn(padapter->pnetdev, "r8712u: free_recv_skb_queue not empty %d\n",
105 skb_queue_len(&precvpriv->free_recv_skb_queue));
108 void r8712_init_recvbuf(struct _adapter *padapter, struct recv_buf *precvbuf)
110 precvbuf->transfer_len = 0;
112 precvbuf->ref_cnt = 0;
113 if (precvbuf->pbuf) {
114 precvbuf->pdata = precvbuf->pbuf;
115 precvbuf->phead = precvbuf->pbuf;
116 precvbuf->ptail = precvbuf->pbuf;
117 precvbuf->pend = precvbuf->pdata + MAX_RECVBUF_SZ;
121 void r8712_free_recvframe(union recv_frame *precvframe,
122 struct __queue *pfree_recv_queue)
125 struct _adapter *padapter = precvframe->u.hdr.adapter;
126 struct recv_priv *precvpriv = &padapter->recvpriv;
128 if (precvframe->u.hdr.pkt) {
129 dev_kfree_skb_any(precvframe->u.hdr.pkt);/*free skb by driver*/
130 precvframe->u.hdr.pkt = NULL;
132 spin_lock_irqsave(&pfree_recv_queue->lock, irqL);
133 list_del_init(&(precvframe->u.hdr.list));
134 list_add_tail(&(precvframe->u.hdr.list), &pfree_recv_queue->queue);
136 if (pfree_recv_queue == &precvpriv->free_recv_queue)
137 precvpriv->free_recvframe_cnt++;
139 spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL);
142 static void update_recvframe_attrib_from_recvstat(struct rx_pkt_attrib *pattrib,
143 struct recv_stat *prxstat)
147 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
152 pattrib->bdecrypted = ((le32_to_cpu(prxstat->rxdw0) & BIT(27)) >> 27)
154 pattrib->crc_err = (le32_to_cpu(prxstat->rxdw0) & BIT(14)) >> 14;
158 if (le32_to_cpu(prxstat->rxdw3) & BIT(13)) {
159 pattrib->tcpchk_valid = 1; /* valid */
160 if (le32_to_cpu(prxstat->rxdw3) & BIT(11))
161 pattrib->tcp_chkrpt = 1; /* correct */
163 pattrib->tcp_chkrpt = 0; /* incorrect */
164 if (le32_to_cpu(prxstat->rxdw3) & BIT(12))
165 pattrib->ip_chkrpt = 1; /* correct */
167 pattrib->ip_chkrpt = 0; /* incorrect */
169 pattrib->tcpchk_valid = 0; /* invalid */
171 pattrib->mcs_rate = (u8)((le32_to_cpu(prxstat->rxdw3)) & 0x3f);
172 pattrib->htc = (u8)((le32_to_cpu(prxstat->rxdw3) >> 14) & 0x1);
179 static union recv_frame *recvframe_defrag(struct _adapter *adapter,
180 struct __queue *defrag_q)
182 struct list_head *plist, *phead;
185 struct recv_frame_hdr *pfhdr, *pnfhdr;
186 union recv_frame *prframe, *pnextrframe;
187 struct __queue *pfree_recv_queue;
189 pfree_recv_queue = &adapter->recvpriv.free_recv_queue;
190 phead = &defrag_q->queue;
192 prframe = container_of(plist, union recv_frame, u.list);
193 list_del_init(&prframe->u.list);
194 pfhdr = &prframe->u.hdr;
196 if (curfragnum != pfhdr->attrib.frag_num) {
197 /*the first fragment number must be 0
198 *free the whole queue
200 r8712_free_recvframe(prframe, pfree_recv_queue);
201 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
205 plist = &defrag_q->queue;
207 while (!end_of_queue_search(phead, plist)) {
208 pnextrframe = container_of(plist, union recv_frame, u.list);
209 pnfhdr = &pnextrframe->u.hdr;
210 /*check the fragment sequence (2nd ~n fragment frame) */
211 if (curfragnum != pnfhdr->attrib.frag_num) {
212 /* the fragment number must increase (after decache)
213 * release the defrag_q & prframe
215 r8712_free_recvframe(prframe, pfree_recv_queue);
216 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
220 /* copy the 2nd~n fragment frame's payload to the first fragment
221 * get the 2nd~last fragment frame's payload
223 wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len;
224 recvframe_pull(pnextrframe, wlanhdr_offset);
225 /* append to first fragment frame's tail (if privacy frame,
228 recvframe_pull_tail(prframe, pfhdr->attrib.icv_len);
229 memcpy(pfhdr->rx_tail, pnfhdr->rx_data, pnfhdr->len);
230 recvframe_put(prframe, pnfhdr->len);
231 pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len;
234 /* free the defrag_q queue and return the prframe */
235 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue);
239 /* check if need to defrag, if needed queue the frame to defrag_q */
240 union recv_frame *r8712_recvframe_chk_defrag(struct _adapter *padapter,
241 union recv_frame *precv_frame)
246 struct recv_frame_hdr *pfhdr;
247 struct sta_info *psta;
248 struct sta_priv *pstapriv;
249 struct list_head *phead;
250 union recv_frame *prtnframe = NULL;
251 struct __queue *pfree_recv_queue, *pdefrag_q;
253 pstapriv = &padapter->stapriv;
254 pfhdr = &precv_frame->u.hdr;
255 pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
256 /* need to define struct of wlan header frame ctrl */
257 ismfrag = pfhdr->attrib.mfrag;
258 fragnum = pfhdr->attrib.frag_num;
259 psta_addr = pfhdr->attrib.ta;
260 psta = r8712_get_stainfo(pstapriv, psta_addr);
264 pdefrag_q = &psta->sta_recvpriv.defrag_q;
266 if ((ismfrag == 0) && (fragnum == 0))
267 prtnframe = precv_frame;/*isn't a fragment frame*/
269 /* 0~(n-1) fragment frame
270 * enqueue to defraf_g
274 /*the first fragment*/
275 if (!list_empty(&pdefrag_q->queue)) {
276 /*free current defrag_q */
277 r8712_free_recvframe_queue(pdefrag_q,
281 /* Then enqueue the 0~(n-1) fragment to the defrag_q */
282 phead = &pdefrag_q->queue;
283 list_add_tail(&pfhdr->list, phead);
286 /* can't find this ta's defrag_queue, so free this
289 r8712_free_recvframe(precv_frame, pfree_recv_queue);
294 if ((ismfrag == 0) && (fragnum != 0)) {
295 /* the last fragment frame
296 * enqueue the last fragment
299 phead = &pdefrag_q->queue;
300 list_add_tail(&pfhdr->list, phead);
301 /*call recvframe_defrag to defrag*/
302 precv_frame = recvframe_defrag(padapter, pdefrag_q);
303 prtnframe = precv_frame;
305 /* can't find this ta's defrag_queue, so free this
308 r8712_free_recvframe(precv_frame, pfree_recv_queue);
312 if (prtnframe && (prtnframe->u.hdr.attrib.privacy)) {
313 /* after defrag we must check tkip mic code */
314 if (r8712_recvframe_chkmic(padapter, prtnframe) == _FAIL) {
315 r8712_free_recvframe(prtnframe, pfree_recv_queue);
322 static void amsdu_to_msdu(struct _adapter *padapter, union recv_frame *prframe)
324 int a_len, padding_len;
325 u16 eth_type, nSubframe_Length;
327 unsigned char *pdata;
328 struct rx_pkt_attrib *pattrib;
329 _pkt *sub_skb, *subframes[MAX_SUBFRAME_COUNT];
330 struct recv_priv *precvpriv = &padapter->recvpriv;
331 struct __queue *pfree_recv_queue = &(precvpriv->free_recv_queue);
334 pattrib = &prframe->u.hdr.attrib;
335 recvframe_pull(prframe, prframe->u.hdr.attrib.hdrlen);
336 if (prframe->u.hdr.attrib.iv_len > 0)
337 recvframe_pull(prframe, prframe->u.hdr.attrib.iv_len);
338 a_len = prframe->u.hdr.len;
339 pdata = prframe->u.hdr.rx_data;
340 while (a_len > ETH_HLEN) {
341 /* Offset 12 denote 2 mac address */
342 nSubframe_Length = *((u16 *)(pdata + 12));
343 /*==m==>change the length order*/
344 nSubframe_Length = (nSubframe_Length >> 8) +
345 (nSubframe_Length << 8);
346 if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
347 netdev_warn(padapter->pnetdev, "r8712u: nRemain_Length is %d and nSubframe_Length is: %d\n",
348 a_len, nSubframe_Length);
351 /* move the data point to data content */
354 /* Allocate new skb for releasing to upper layer */
355 sub_skb = dev_alloc_skb(nSubframe_Length + 12);
358 skb_reserve(sub_skb, 12);
359 skb_put_data(sub_skb, pdata, nSubframe_Length);
360 subframes[nr_subframes++] = sub_skb;
361 if (nr_subframes >= MAX_SUBFRAME_COUNT) {
362 netdev_warn(padapter->pnetdev, "r8712u: ParseSubframe(): Too many Subframes! Packets dropped!\n");
365 pdata += nSubframe_Length;
366 a_len -= nSubframe_Length;
368 padding_len = 4 - ((nSubframe_Length + ETH_HLEN) & 3);
369 if (padding_len == 4)
371 if (a_len < padding_len)
373 pdata += padding_len;
374 a_len -= padding_len;
377 for (i = 0; i < nr_subframes; i++) {
378 sub_skb = subframes[i];
379 /* convert hdr + possible LLC headers into Ethernet header */
380 eth_type = (sub_skb->data[6] << 8) | sub_skb->data[7];
381 if (sub_skb->len >= 8 &&
382 ((!memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) &&
383 eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) ||
384 !memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE))) {
385 /* remove RFC1042 or Bridge-Tunnel encapsulation and
388 skb_pull(sub_skb, SNAP_SIZE);
389 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
391 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
395 /* Leave Ethernet header part of hdr and full payload */
396 len = htons(sub_skb->len);
397 memcpy(skb_push(sub_skb, 2), &len, 2);
398 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src,
400 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst,
403 /* Indicate the packets to upper layer */
406 eth_type_trans(sub_skb, padapter->pnetdev);
407 sub_skb->dev = padapter->pnetdev;
408 if ((pattrib->tcpchk_valid == 1) &&
409 (pattrib->tcp_chkrpt == 1)) {
410 sub_skb->ip_summed = CHECKSUM_UNNECESSARY;
412 sub_skb->ip_summed = CHECKSUM_NONE;
418 prframe->u.hdr.len = 0;
419 r8712_free_recvframe(prframe, pfree_recv_queue);
422 void r8712_rxcmd_event_hdl(struct _adapter *padapter, void *prxcmdbuf)
426 u16 cmd_len, drvinfo_sz;
427 struct recv_stat *prxstat;
430 voffset = *(__le32 *)poffset;
432 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
434 poffset += RXDESC_SIZE + drvinfo_sz;
436 voffset = *(__le32 *)poffset;
437 cmd_len = (u16)(le32_to_cpu(voffset) & 0xffff);
438 r8712_event_handle(padapter, (__le32 *)poffset);
439 poffset += (cmd_len + 8);/*8 bytes alignment*/
440 } while (le32_to_cpu(voffset) & BIT(31));
444 static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl,
447 u8 wsize = preorder_ctrl->wsize_b;
448 u16 wend = (preorder_ctrl->indicate_seq + wsize - 1) % 4096;
450 /* Rx Reorder initialize condition.*/
451 if (preorder_ctrl->indicate_seq == 0xffff)
452 preorder_ctrl->indicate_seq = seq_num;
453 /* Drop out the packet which SeqNum is smaller than WinStart */
454 if (SN_LESS(seq_num, preorder_ctrl->indicate_seq))
457 * Sliding window manipulation. Conditions includes:
458 * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
459 * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
461 if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq))
462 preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq +
464 else if (SN_LESS(wend, seq_num)) {
465 if (seq_num >= (wsize - 1))
466 preorder_ctrl->indicate_seq = seq_num + 1 - wsize;
468 preorder_ctrl->indicate_seq = 4095 - (wsize -
474 static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl,
475 union recv_frame *prframe)
477 struct list_head *phead, *plist;
478 union recv_frame *pnextrframe;
479 struct rx_pkt_attrib *pnextattrib;
480 struct __queue *ppending_recvframe_queue =
481 &preorder_ctrl->pending_recvframe_queue;
482 struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
484 phead = &ppending_recvframe_queue->queue;
486 while (!end_of_queue_search(phead, plist)) {
487 pnextrframe = container_of(plist, union recv_frame, u.list);
488 pnextattrib = &pnextrframe->u.hdr.attrib;
489 if (SN_LESS(pnextattrib->seq_num, pattrib->seq_num))
491 else if (SN_EQUAL(pnextattrib->seq_num, pattrib->seq_num))
496 list_del_init(&(prframe->u.hdr.list));
497 list_add_tail(&(prframe->u.hdr.list), plist);
501 int r8712_recv_indicatepkts_in_order(struct _adapter *padapter,
502 struct recv_reorder_ctrl *preorder_ctrl,
505 struct list_head *phead, *plist;
506 union recv_frame *prframe;
507 struct rx_pkt_attrib *pattrib;
508 int bPktInBuf = false;
509 struct __queue *ppending_recvframe_queue =
510 &preorder_ctrl->pending_recvframe_queue;
512 phead = &ppending_recvframe_queue->queue;
514 /* Handling some condition for forced indicate case.*/
516 if (list_empty(phead))
519 prframe = container_of(plist, union recv_frame, u.list);
520 pattrib = &prframe->u.hdr.attrib;
521 preorder_ctrl->indicate_seq = pattrib->seq_num;
523 /* Prepare indication list and indication.
524 * Check if there is any packet need indicate.
526 while (!list_empty(phead)) {
527 prframe = container_of(plist, union recv_frame, u.list);
528 pattrib = &prframe->u.hdr.attrib;
529 if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) {
531 list_del_init(&(prframe->u.hdr.list));
532 if (SN_EQUAL(preorder_ctrl->indicate_seq,
534 preorder_ctrl->indicate_seq =
535 (preorder_ctrl->indicate_seq + 1) % 4096;
536 /*indicate this recv_frame*/
537 if (!pattrib->amsdu) {
538 if (!padapter->driver_stopped &&
539 !padapter->surprise_removed) {
540 /* indicate this recv_frame */
541 r8712_recv_indicatepkt(padapter,
544 } else if (pattrib->amsdu == 1) {
545 amsdu_to_msdu(padapter, prframe);
547 /* Update local variables. */
557 static int recv_indicatepkt_reorder(struct _adapter *padapter,
558 union recv_frame *prframe)
561 struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
562 struct recv_reorder_ctrl *preorder_ctrl = prframe->u.hdr.preorder_ctrl;
563 struct __queue *ppending_recvframe_queue =
564 &preorder_ctrl->pending_recvframe_queue;
566 if (!pattrib->amsdu) {
568 r8712_wlanhdr_to_ethhdr(prframe);
569 if (pattrib->qos != 1) {
570 if (!padapter->driver_stopped &&
571 !padapter->surprise_removed) {
572 r8712_recv_indicatepkt(padapter, prframe);
579 spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
580 /*s2. check if winstart_b(indicate_seq) needs to be updated*/
581 if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num))
583 /*s3. Insert all packet into Reorder Queue to maintain its ordering.*/
584 if (!enqueue_reorder_recvframe(preorder_ctrl, prframe))
587 * Indication process.
588 * After Packet dropping and Sliding Window shifting as above, we can
589 * now just indicate the packets with the SeqNum smaller than latest
590 * WinStart and buffer other packets.
592 * For Rx Reorder condition:
593 * 1. All packets with SeqNum smaller than WinStart => Indicate
594 * 2. All packets with SeqNum larger than or equal to
595 * WinStart => Buffer it.
597 if (r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, false)) {
598 mod_timer(&preorder_ctrl->reordering_ctrl_timer,
599 jiffies + msecs_to_jiffies(REORDER_WAIT_TIME));
600 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
602 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
603 del_timer(&preorder_ctrl->reordering_ctrl_timer);
607 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
611 void r8712_reordering_ctrl_timeout_handler(void *pcontext)
614 struct recv_reorder_ctrl *preorder_ctrl = pcontext;
615 struct _adapter *padapter = preorder_ctrl->padapter;
616 struct __queue *ppending_recvframe_queue =
617 &preorder_ctrl->pending_recvframe_queue;
619 if (padapter->driver_stopped || padapter->surprise_removed)
621 spin_lock_irqsave(&ppending_recvframe_queue->lock, irql);
622 r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, true);
623 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql);
626 static int r8712_process_recv_indicatepkts(struct _adapter *padapter,
627 union recv_frame *prframe)
629 int retval = _SUCCESS;
630 struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
631 struct ht_priv *phtpriv = &pmlmepriv->htpriv;
633 if (phtpriv->ht_option == 1) { /*B/G/N Mode*/
634 if (recv_indicatepkt_reorder(padapter, prframe)) {
635 /* including perform A-MPDU Rx Ordering Buffer Control*/
636 if (!padapter->driver_stopped &&
637 !padapter->surprise_removed)
640 } else { /*B/G mode*/
641 retval = r8712_wlanhdr_to_ethhdr(prframe);
644 if (!padapter->driver_stopped && !padapter->surprise_removed) {
645 /* indicate this recv_frame */
646 r8712_recv_indicatepkt(padapter, prframe);
654 static u8 query_rx_pwr_percentage(s8 antpower)
656 if ((antpower <= -100) || (antpower >= 20))
658 else if (antpower >= 0)
661 return 100 + antpower;
664 static u8 evm_db2percentage(s8 value)
667 * -33dB~0dB to 0%~99%
683 s32 r8712_signal_scale_mapping(s32 cur_sig)
687 if (cur_sig >= 51 && cur_sig <= 100)
689 else if (cur_sig >= 41 && cur_sig <= 50)
690 ret_sig = 80 + ((cur_sig - 40) * 2);
691 else if (cur_sig >= 31 && cur_sig <= 40)
692 ret_sig = 66 + (cur_sig - 30);
693 else if (cur_sig >= 21 && cur_sig <= 30)
694 ret_sig = 54 + (cur_sig - 20);
695 else if (cur_sig >= 10 && cur_sig <= 20)
696 ret_sig = 42 + (((cur_sig - 10) * 2) / 3);
697 else if (cur_sig >= 5 && cur_sig <= 9)
698 ret_sig = 22 + (((cur_sig - 5) * 3) / 2);
699 else if (cur_sig >= 1 && cur_sig <= 4)
700 ret_sig = 6 + (((cur_sig - 1) * 3) / 2);
706 static s32 translate2dbm(struct _adapter *padapter, u8 signal_strength_idx)
708 s32 signal_power; /* in dBm.*/
709 /* Translate to dBm (x=0.5y-95).*/
710 signal_power = (s32)((signal_strength_idx + 1) >> 1);
715 static void query_rx_phy_status(struct _adapter *padapter,
716 union recv_frame *prframe)
718 u8 i, max_spatial_stream, evm;
719 struct recv_stat *prxstat = (struct recv_stat *)prframe->u.hdr.rx_head;
720 struct phy_stat *pphy_stat = (struct phy_stat *)(prxstat + 1);
721 u8 *pphy_head = (u8 *)(prxstat + 1);
722 s8 rx_pwr[4], rx_pwr_all;
724 u32 rssi, total_rssi = 0;
725 u8 bcck_rate = 0, rf_rx_num = 0, cck_highpwr = 0;
726 struct phy_cck_rx_status *pcck_buf;
729 /* Record it for next packet processing*/
730 bcck_rate = (prframe->u.hdr.attrib.mcs_rate <= 3 ? 1 : 0);
734 /* CCK Driver info Structure is not the same as OFDM packet.*/
735 pcck_buf = (struct phy_cck_rx_status *)pphy_stat;
736 /* (1)Hardware does not provide RSSI for CCK
737 * (2)PWDB, Average PWDB calculated by hardware
738 * (for rate adaptive)
741 report = pcck_buf->cck_agc_rpt & 0xc0;
744 /* Modify the RF RNA gain value to -40, -20,
745 * -2, 14 by Jenyu's suggestion
746 * Note: different RF with the different
750 rx_pwr_all = -40 - (pcck_buf->cck_agc_rpt &
754 rx_pwr_all = -20 - (pcck_buf->cck_agc_rpt &
758 rx_pwr_all = -2 - (pcck_buf->cck_agc_rpt &
762 rx_pwr_all = 14 - (pcck_buf->cck_agc_rpt &
767 report = ((u8)(le32_to_cpu(pphy_stat->phydw1) >> 8)) &
772 rx_pwr_all = -40 - ((pcck_buf->cck_agc_rpt &
776 rx_pwr_all = -20 - ((pcck_buf->cck_agc_rpt &
780 rx_pwr_all = -2 - ((pcck_buf->cck_agc_rpt &
784 rx_pwr_all = 14 - ((pcck_buf->cck_agc_rpt &
789 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
790 /* CCK gain is smaller than OFDM/MCS gain,*/
791 /* so we add gain diff by experiences, the val is 6 */
795 /* modify the offset to make the same gain index with OFDM.*/
796 if (pwdb_all > 34 && pwdb_all <= 42)
798 else if (pwdb_all > 26 && pwdb_all <= 34)
800 else if (pwdb_all > 14 && pwdb_all <= 26)
802 else if (pwdb_all > 4 && pwdb_all <= 14)
805 * (3) Get Signal Quality (EVM)
810 sq = pcck_buf->sq_rpt;
811 if (pcck_buf->sq_rpt > 64)
813 else if (pcck_buf->sq_rpt < 20)
816 sq = ((64 - sq) * 100) / 44;
818 prframe->u.hdr.attrib.signal_qual = sq;
819 prframe->u.hdr.attrib.rx_mimo_signal_qual[0] = sq;
820 prframe->u.hdr.attrib.rx_mimo_signal_qual[1] = -1;
822 /* (1)Get RSSI for HT rate */
823 for (i = 0; i < ((padapter->registrypriv.rf_config) &
826 rx_pwr[i] = ((pphy_head[PHY_STAT_GAIN_TRSW_SHT + i]
828 /* Translate DBM to percentage. */
829 rssi = query_rx_pwr_percentage(rx_pwr[i]);
832 /* (2)PWDB, Average PWDB calculated by hardware (for
835 rx_pwr_all = (((pphy_head[PHY_STAT_PWDB_ALL_SHT]) >> 1) & 0x7f)
837 pwdb_all = query_rx_pwr_percentage(rx_pwr_all);
840 /* (3)EVM of HT rate */
841 if (prframe->u.hdr.attrib.htc &&
842 prframe->u.hdr.attrib.mcs_rate >= 20 &&
843 prframe->u.hdr.attrib.mcs_rate <= 27) {
844 /* both spatial stream make sense */
845 max_spatial_stream = 2;
847 /* only spatial stream 1 makes sense */
848 max_spatial_stream = 1;
850 for (i = 0; i < max_spatial_stream; i++) {
851 evm = evm_db2percentage((pphy_head
852 [PHY_STAT_RXEVM_SHT + i]));/*dbm*/
853 prframe->u.hdr.attrib.signal_qual =
855 prframe->u.hdr.attrib.rx_mimo_signal_qual[i] =
860 /* UI BSS List signal strength(in percentage), make it good looking,
861 * from 0~100. It is assigned to the BSS List in
862 * GetValueFromBeaconOrProbeRsp().
865 prframe->u.hdr.attrib.signal_strength =
866 (u8)r8712_signal_scale_mapping(pwdb_all);
869 prframe->u.hdr.attrib.signal_strength =
870 (u8)(r8712_signal_scale_mapping(total_rssi /=
875 static void process_link_qual(struct _adapter *padapter,
876 union recv_frame *prframe)
878 u32 last_evm = 0, tmpVal;
879 struct rx_pkt_attrib *pattrib;
880 struct smooth_rssi_data *sqd = &padapter->recvpriv.signal_qual_data;
882 if (!prframe || !padapter)
884 pattrib = &prframe->u.hdr.attrib;
885 if (pattrib->signal_qual != 0) {
887 * 1. Record the general EVM to the sliding window.
889 if (sqd->total_num++ >= PHY_LINKQUALITY_SLID_WIN_MAX) {
890 sqd->total_num = PHY_LINKQUALITY_SLID_WIN_MAX;
891 last_evm = sqd->elements[sqd->index];
892 sqd->total_val -= last_evm;
894 sqd->total_val += pattrib->signal_qual;
895 sqd->elements[sqd->index++] = pattrib->signal_qual;
896 if (sqd->index >= PHY_LINKQUALITY_SLID_WIN_MAX)
899 /* <1> Showed on UI for user, in percentage. */
900 tmpVal = sqd->total_val / sqd->total_num;
901 padapter->recvpriv.signal = (u8)tmpVal;
905 static void process_rssi(struct _adapter *padapter, union recv_frame *prframe)
907 u32 last_rssi, tmp_val;
908 struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib;
909 struct smooth_rssi_data *ssd = &padapter->recvpriv.signal_strength_data;
911 if (ssd->total_num++ >= PHY_RSSI_SLID_WIN_MAX) {
912 ssd->total_num = PHY_RSSI_SLID_WIN_MAX;
913 last_rssi = ssd->elements[ssd->index];
914 ssd->total_val -= last_rssi;
916 ssd->total_val += pattrib->signal_strength;
917 ssd->elements[ssd->index++] = pattrib->signal_strength;
918 if (ssd->index >= PHY_RSSI_SLID_WIN_MAX)
920 tmp_val = ssd->total_val / ssd->total_num;
921 padapter->recvpriv.rssi = (s8)translate2dbm(padapter, (u8)tmp_val);
924 static void process_phy_info(struct _adapter *padapter,
925 union recv_frame *prframe)
927 query_rx_phy_status(padapter, prframe);
928 process_rssi(padapter, prframe);
929 process_link_qual(padapter, prframe);
932 int recv_func(struct _adapter *padapter, void *pcontext)
934 struct rx_pkt_attrib *pattrib;
935 union recv_frame *prframe, *orig_prframe;
936 int retval = _SUCCESS;
937 struct __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue;
938 struct mlme_priv *pmlmepriv = &padapter->mlmepriv;
941 orig_prframe = prframe;
942 pattrib = &prframe->u.hdr.attrib;
943 if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) {
944 if (pattrib->crc_err == 1)
945 padapter->mppriv.rx_crcerrpktcount++;
947 padapter->mppriv.rx_pktcount++;
948 if (!check_fwstate(pmlmepriv, WIFI_MP_LPBK_STATE)) {
949 /* free this recv_frame */
950 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
951 goto _exit_recv_func;
954 /* check the frame crtl field and decache */
955 retval = r8712_validate_recv_frame(padapter, prframe);
956 if (retval != _SUCCESS) {
957 /* free this recv_frame */
958 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
959 goto _exit_recv_func;
961 process_phy_info(padapter, prframe);
962 prframe = r8712_decryptor(padapter, prframe);
965 goto _exit_recv_func;
967 prframe = r8712_recvframe_chk_defrag(padapter, prframe);
969 goto _exit_recv_func;
970 prframe = r8712_portctrl(padapter, prframe);
973 goto _exit_recv_func;
975 retval = r8712_process_recv_indicatepkts(padapter, prframe);
976 if (retval != _SUCCESS) {
977 r8712_free_recvframe(orig_prframe, pfree_recv_queue);
978 goto _exit_recv_func;
984 static void recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb)
986 u8 *pbuf, shift_sz = 0;
990 struct recv_stat *prxstat;
991 u16 pkt_cnt, drvinfo_sz, pkt_offset, tmp_len, alloc_sz;
992 struct __queue *pfree_recv_queue;
993 _pkt *pkt_copy = NULL;
994 union recv_frame *precvframe = NULL;
995 struct recv_priv *precvpriv = &padapter->recvpriv;
997 pfree_recv_queue = &(precvpriv->free_recv_queue);
999 prxstat = (struct recv_stat *)pbuf;
1000 pkt_cnt = (le32_to_cpu(prxstat->rxdw2) >> 16) & 0xff;
1001 pkt_len = le32_to_cpu(prxstat->rxdw0) & 0x00003fff;
1002 transfer_len = pskb->len;
1003 /* Test throughput with Netgear 3700 (No security) with Chariot 3T3R
1004 * pairs. The packet count will be a big number so that the containing
1005 * packet will effect the Rx reordering.
1007 if (transfer_len < pkt_len) {
1008 /* In this case, it means the MAX_RECVBUF_SZ is too small to
1009 * get the data from 8712u.
1014 prxstat = (struct recv_stat *)pbuf;
1015 pkt_len = le32_to_cpu(prxstat->rxdw0) & 0x00003fff;
1016 /* more fragment bit */
1017 mf = (le32_to_cpu(prxstat->rxdw1) >> 27) & 0x1;
1018 /* ragmentation number */
1019 frag = (le32_to_cpu(prxstat->rxdw2) >> 12) & 0xf;
1020 /* uint 2^3 = 8 bytes */
1021 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16;
1025 /* Qos data, wireless lan header length is 26 */
1026 if ((le32_to_cpu(prxstat->rxdw0) >> 23) & 0x01)
1028 precvframe = r8712_alloc_recvframe(pfree_recv_queue);
1031 INIT_LIST_HEAD(&precvframe->u.hdr.list);
1032 precvframe->u.hdr.precvbuf = NULL; /*can't access the precvbuf*/
1033 precvframe->u.hdr.len = 0;
1034 tmp_len = pkt_len + drvinfo_sz + RXDESC_SIZE;
1035 pkt_offset = (u16)round_up(tmp_len, 128);
1036 /* for first fragment packet, driver need allocate 1536 +
1037 * drvinfo_sz + RXDESC_SIZE to defrag packet.
1039 if ((mf == 1) && (frag == 0))
1040 /*1658+6=1664, 1664 is 128 alignment.*/
1041 alloc_sz = max_t(u16, tmp_len, 1658);
1044 /* 2 is for IP header 4 bytes alignment in QoS packet case.
1045 * 4 is for skb->data 4 bytes alignment.
1048 pkt_copy = netdev_alloc_skb(padapter->pnetdev, alloc_sz);
1050 precvframe->u.hdr.pkt = pkt_copy;
1051 skb_reserve(pkt_copy, 4 - ((addr_t)(pkt_copy->data)
1053 skb_reserve(pkt_copy, shift_sz);
1054 memcpy(pkt_copy->data, pbuf, tmp_len);
1055 precvframe->u.hdr.rx_head = precvframe->u.hdr.rx_data =
1056 precvframe->u.hdr.rx_tail = pkt_copy->data;
1057 precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz;
1059 precvframe->u.hdr.pkt = skb_clone(pskb, GFP_ATOMIC);
1060 if (!precvframe->u.hdr.pkt)
1062 precvframe->u.hdr.rx_head = pbuf;
1063 precvframe->u.hdr.rx_data = pbuf;
1064 precvframe->u.hdr.rx_tail = pbuf;
1065 precvframe->u.hdr.rx_end = pbuf + alloc_sz;
1067 recvframe_put(precvframe, tmp_len);
1068 recvframe_pull(precvframe, drvinfo_sz + RXDESC_SIZE);
1069 /* because the endian issue, driver avoid reference to the
1070 * rxstat after calling update_recvframe_attrib_from_recvstat();
1072 update_recvframe_attrib_from_recvstat(&precvframe->u.hdr.attrib,
1074 r8712_recv_entry(precvframe);
1075 transfer_len -= pkt_offset;
1080 } while ((transfer_len > 0) && pkt_cnt > 0);
1083 static void recv_tasklet(void *priv)
1085 struct sk_buff *pskb;
1086 struct _adapter *padapter = priv;
1087 struct recv_priv *precvpriv = &padapter->recvpriv;
1089 while (NULL != (pskb = skb_dequeue(&precvpriv->rx_skb_queue))) {
1090 recvbuf2recvframe(padapter, pskb);
1091 skb_reset_tail_pointer(pskb);
1093 if (!skb_cloned(pskb))
1094 skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb);