1 // SPDX-License-Identifier: GPL-2.0 2 /****************************************************************************** 3 * rtl8712_recv.c 4 * 5 * Copyright(c) 2007 - 2010 Realtek Corporation. All rights reserved. 6 * Linux device driver for RTL8192SU 7 * 8 * Modifications for inclusion into the Linux staging tree are 9 * Copyright(c) 2010 Larry Finger. All rights reserved. 10 * 11 * Contact information: 12 * WLAN FAE <wlanfae@realtek.com> 13 * Larry Finger <Larry.Finger@lwfinger.net> 14 * 15 ******************************************************************************/ 16 17 #define _RTL8712_RECV_C_ 18 19 #include <linux/if_ether.h> 20 #include <linux/ip.h> 21 #include <net/cfg80211.h> 22 23 #include "osdep_service.h" 24 #include "drv_types.h" 25 #include "recv_osdep.h" 26 #include "mlme_osdep.h" 27 #include "ethernet.h" 28 #include "usb_ops.h" 29 #include "wifi.h" 30 31 static void recv_tasklet(struct tasklet_struct *t); 32 33 int r8712_init_recv_priv(struct recv_priv *precvpriv, 34 struct _adapter *padapter) 35 { 36 int i; 37 struct recv_buf *precvbuf; 38 addr_t tmpaddr = 0; 39 int alignment = 0; 40 struct sk_buff *pskb = NULL; 41 42 /*init recv_buf*/ 43 _init_queue(&precvpriv->free_recv_buf_queue); 44 precvpriv->pallocated_recv_buf = 45 kzalloc(NR_RECVBUFF * sizeof(struct recv_buf) + 4, GFP_ATOMIC); 46 if (!precvpriv->pallocated_recv_buf) 47 return -ENOMEM; 48 precvpriv->precv_buf = precvpriv->pallocated_recv_buf + 4 - 49 ((addr_t)(precvpriv->pallocated_recv_buf) & 3); 50 precvbuf = (struct recv_buf *)precvpriv->precv_buf; 51 for (i = 0; i < NR_RECVBUFF; i++) { 52 INIT_LIST_HEAD(&precvbuf->list); 53 spin_lock_init(&precvbuf->recvbuf_lock); 54 if (r8712_os_recvbuf_resource_alloc(padapter, precvbuf)) 55 break; 56 precvbuf->ref_cnt = 0; 57 precvbuf->adapter = padapter; 58 list_add_tail(&precvbuf->list, 59 &precvpriv->free_recv_buf_queue.queue); 60 precvbuf++; 61 } 62 precvpriv->free_recv_buf_queue_cnt = NR_RECVBUFF; 63 tasklet_setup(&precvpriv->recv_tasklet, recv_tasklet); 64 skb_queue_head_init(&precvpriv->rx_skb_queue); 65 66 skb_queue_head_init(&precvpriv->free_recv_skb_queue); 67 for (i = 0; i < NR_PREALLOC_RECV_SKB; i++) { 68 pskb = netdev_alloc_skb(padapter->pnetdev, MAX_RECVBUF_SZ + 69 RECVBUFF_ALIGN_SZ); 70 if (pskb) { 71 tmpaddr = (addr_t)pskb->data; 72 alignment = tmpaddr & (RECVBUFF_ALIGN_SZ - 1); 73 skb_reserve(pskb, (RECVBUFF_ALIGN_SZ - alignment)); 74 skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb); 75 } 76 pskb = NULL; 77 } 78 return 0; 79 } 80 81 void r8712_free_recv_priv(struct recv_priv *precvpriv) 82 { 83 int i; 84 struct recv_buf *precvbuf; 85 struct _adapter *padapter = precvpriv->adapter; 86 87 precvbuf = (struct recv_buf *)precvpriv->precv_buf; 88 for (i = 0; i < NR_RECVBUFF; i++) { 89 r8712_os_recvbuf_resource_free(padapter, precvbuf); 90 precvbuf++; 91 } 92 kfree(precvpriv->pallocated_recv_buf); 93 skb_queue_purge(&precvpriv->rx_skb_queue); 94 if (skb_queue_len(&precvpriv->rx_skb_queue)) 95 netdev_warn(padapter->pnetdev, "r8712u: rx_skb_queue not empty\n"); 96 skb_queue_purge(&precvpriv->free_recv_skb_queue); 97 if (skb_queue_len(&precvpriv->free_recv_skb_queue)) 98 netdev_warn(padapter->pnetdev, "r8712u: free_recv_skb_queue not empty %d\n", 99 skb_queue_len(&precvpriv->free_recv_skb_queue)); 100 } 101 102 void r8712_init_recvbuf(struct _adapter *padapter, struct recv_buf *precvbuf) 103 { 104 precvbuf->transfer_len = 0; 105 precvbuf->len = 0; 106 precvbuf->ref_cnt = 0; 107 if (precvbuf->pbuf) { 108 precvbuf->pdata = precvbuf->pbuf; 109 precvbuf->phead = precvbuf->pbuf; 110 precvbuf->ptail = precvbuf->pbuf; 111 precvbuf->pend = precvbuf->pdata + MAX_RECVBUF_SZ; 112 } 113 } 114 115 void r8712_free_recvframe(union recv_frame *precvframe, 116 struct __queue *pfree_recv_queue) 117 { 118 unsigned long irqL; 119 struct _adapter *padapter = precvframe->u.hdr.adapter; 120 struct recv_priv *precvpriv = &padapter->recvpriv; 121 122 if (precvframe->u.hdr.pkt) { 123 dev_kfree_skb_any(precvframe->u.hdr.pkt);/*free skb by driver*/ 124 precvframe->u.hdr.pkt = NULL; 125 } 126 spin_lock_irqsave(&pfree_recv_queue->lock, irqL); 127 list_del_init(&precvframe->u.hdr.list); 128 list_add_tail(&precvframe->u.hdr.list, &pfree_recv_queue->queue); 129 if (padapter) { 130 if (pfree_recv_queue == &precvpriv->free_recv_queue) 131 precvpriv->free_recvframe_cnt++; 132 } 133 spin_unlock_irqrestore(&pfree_recv_queue->lock, irqL); 134 } 135 136 static void update_recvframe_attrib_from_recvstat(struct rx_pkt_attrib *pattrib, 137 struct recv_stat *prxstat) 138 { 139 u16 drvinfo_sz; 140 141 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16; 142 drvinfo_sz <<= 3; 143 /*TODO: 144 * Offset 0 145 */ 146 pattrib->bdecrypted = (le32_to_cpu(prxstat->rxdw0) & BIT(27)) == 0; 147 pattrib->crc_err = (le32_to_cpu(prxstat->rxdw0) & BIT(14)) != 0; 148 /*Offset 4*/ 149 /*Offset 8*/ 150 /*Offset 12*/ 151 if (le32_to_cpu(prxstat->rxdw3) & BIT(13)) { 152 pattrib->tcpchk_valid = 1; /* valid */ 153 if (le32_to_cpu(prxstat->rxdw3) & BIT(11)) 154 pattrib->tcp_chkrpt = 1; /* correct */ 155 else 156 pattrib->tcp_chkrpt = 0; /* incorrect */ 157 if (le32_to_cpu(prxstat->rxdw3) & BIT(12)) 158 pattrib->ip_chkrpt = 1; /* correct */ 159 else 160 pattrib->ip_chkrpt = 0; /* incorrect */ 161 } else { 162 pattrib->tcpchk_valid = 0; /* invalid */ 163 } 164 pattrib->mcs_rate = (u8)((le32_to_cpu(prxstat->rxdw3)) & 0x3f); 165 pattrib->htc = (u8)((le32_to_cpu(prxstat->rxdw3) >> 14) & 0x1); 166 /*Offset 16*/ 167 /*Offset 20*/ 168 /*phy_info*/ 169 } 170 171 /*perform defrag*/ 172 static union recv_frame *recvframe_defrag(struct _adapter *adapter, 173 struct __queue *defrag_q) 174 { 175 struct list_head *plist, *phead; 176 u8 wlanhdr_offset; 177 u8 curfragnum; 178 struct recv_frame_hdr *pfhdr, *pnfhdr; 179 union recv_frame *prframe, *pnextrframe; 180 struct __queue *pfree_recv_queue; 181 182 pfree_recv_queue = &adapter->recvpriv.free_recv_queue; 183 phead = &defrag_q->queue; 184 plist = phead->next; 185 prframe = container_of(plist, union recv_frame, u.list); 186 list_del_init(&prframe->u.list); 187 pfhdr = &prframe->u.hdr; 188 curfragnum = 0; 189 if (curfragnum != pfhdr->attrib.frag_num) { 190 /*the first fragment number must be 0 191 *free the whole queue 192 */ 193 r8712_free_recvframe(prframe, pfree_recv_queue); 194 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue); 195 return NULL; 196 } 197 curfragnum++; 198 plist = &defrag_q->queue; 199 plist = plist->next; 200 while (!end_of_queue_search(phead, plist)) { 201 pnextrframe = container_of(plist, union recv_frame, u.list); 202 pnfhdr = &pnextrframe->u.hdr; 203 /*check the fragment sequence (2nd ~n fragment frame) */ 204 if (curfragnum != pnfhdr->attrib.frag_num) { 205 /* the fragment number must increase (after decache) 206 * release the defrag_q & prframe 207 */ 208 r8712_free_recvframe(prframe, pfree_recv_queue); 209 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue); 210 return NULL; 211 } 212 curfragnum++; 213 /* copy the 2nd~n fragment frame's payload to the first fragment 214 * get the 2nd~last fragment frame's payload 215 */ 216 wlanhdr_offset = pnfhdr->attrib.hdrlen + pnfhdr->attrib.iv_len; 217 recvframe_pull(pnextrframe, wlanhdr_offset); 218 /* append to first fragment frame's tail (if privacy frame, 219 * pull the ICV) 220 */ 221 recvframe_pull_tail(prframe, pfhdr->attrib.icv_len); 222 memcpy(pfhdr->rx_tail, pnfhdr->rx_data, pnfhdr->len); 223 recvframe_put(prframe, pnfhdr->len); 224 pfhdr->attrib.icv_len = pnfhdr->attrib.icv_len; 225 plist = plist->next; 226 } 227 /* free the defrag_q queue and return the prframe */ 228 r8712_free_recvframe_queue(defrag_q, pfree_recv_queue); 229 return prframe; 230 } 231 232 /* check if need to defrag, if needed queue the frame to defrag_q */ 233 union recv_frame *r8712_recvframe_chk_defrag(struct _adapter *padapter, 234 union recv_frame *precv_frame) 235 { 236 u8 ismfrag; 237 u8 fragnum; 238 u8 *psta_addr; 239 struct recv_frame_hdr *pfhdr; 240 struct sta_info *psta; 241 struct sta_priv *pstapriv; 242 struct list_head *phead; 243 union recv_frame *prtnframe = NULL; 244 struct __queue *pfree_recv_queue, *pdefrag_q; 245 246 pstapriv = &padapter->stapriv; 247 pfhdr = &precv_frame->u.hdr; 248 pfree_recv_queue = &padapter->recvpriv.free_recv_queue; 249 /* need to define struct of wlan header frame ctrl */ 250 ismfrag = pfhdr->attrib.mfrag; 251 fragnum = pfhdr->attrib.frag_num; 252 psta_addr = pfhdr->attrib.ta; 253 psta = r8712_get_stainfo(pstapriv, psta_addr); 254 if (!psta) 255 pdefrag_q = NULL; 256 else 257 pdefrag_q = &psta->sta_recvpriv.defrag_q; 258 259 if ((ismfrag == 0) && (fragnum == 0)) 260 prtnframe = precv_frame;/*isn't a fragment frame*/ 261 if (ismfrag == 1) { 262 /* 0~(n-1) fragment frame 263 * enqueue to defraf_g 264 */ 265 if (pdefrag_q) { 266 if (fragnum == 0) { 267 /*the first fragment*/ 268 if (!list_empty(&pdefrag_q->queue)) { 269 /*free current defrag_q */ 270 r8712_free_recvframe_queue(pdefrag_q, 271 pfree_recv_queue); 272 } 273 } 274 /* Then enqueue the 0~(n-1) fragment to the defrag_q */ 275 phead = &pdefrag_q->queue; 276 list_add_tail(&pfhdr->list, phead); 277 prtnframe = NULL; 278 } else { 279 /* can't find this ta's defrag_queue, so free this 280 * recv_frame 281 */ 282 r8712_free_recvframe(precv_frame, pfree_recv_queue); 283 prtnframe = NULL; 284 } 285 } 286 if ((ismfrag == 0) && (fragnum != 0)) { 287 /* the last fragment frame 288 * enqueue the last fragment 289 */ 290 if (pdefrag_q) { 291 phead = &pdefrag_q->queue; 292 list_add_tail(&pfhdr->list, phead); 293 /*call recvframe_defrag to defrag*/ 294 precv_frame = recvframe_defrag(padapter, pdefrag_q); 295 prtnframe = precv_frame; 296 } else { 297 /* can't find this ta's defrag_queue, so free this 298 * recv_frame 299 */ 300 r8712_free_recvframe(precv_frame, pfree_recv_queue); 301 prtnframe = NULL; 302 } 303 } 304 if (prtnframe && (prtnframe->u.hdr.attrib.privacy)) { 305 /* after defrag we must check tkip mic code */ 306 if (r8712_recvframe_chkmic(padapter, prtnframe) == _FAIL) { 307 r8712_free_recvframe(prtnframe, pfree_recv_queue); 308 prtnframe = NULL; 309 } 310 } 311 return prtnframe; 312 } 313 314 static void amsdu_to_msdu(struct _adapter *padapter, union recv_frame *prframe) 315 { 316 int a_len, padding_len; 317 u16 eth_type, nSubframe_Length; 318 u8 nr_subframes, i; 319 unsigned char *pdata; 320 struct rx_pkt_attrib *pattrib; 321 _pkt *sub_skb, *subframes[MAX_SUBFRAME_COUNT]; 322 struct recv_priv *precvpriv = &padapter->recvpriv; 323 struct __queue *pfree_recv_queue = &precvpriv->free_recv_queue; 324 325 nr_subframes = 0; 326 pattrib = &prframe->u.hdr.attrib; 327 recvframe_pull(prframe, prframe->u.hdr.attrib.hdrlen); 328 if (prframe->u.hdr.attrib.iv_len > 0) 329 recvframe_pull(prframe, prframe->u.hdr.attrib.iv_len); 330 a_len = prframe->u.hdr.len; 331 pdata = prframe->u.hdr.rx_data; 332 while (a_len > ETH_HLEN) { 333 /* Offset 12 denote 2 mac address */ 334 nSubframe_Length = *((u16 *)(pdata + 12)); 335 /*==m==>change the length order*/ 336 nSubframe_Length = (nSubframe_Length >> 8) + 337 (nSubframe_Length << 8); 338 if (a_len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) { 339 netdev_warn(padapter->pnetdev, "r8712u: nRemain_Length is %d and nSubframe_Length is: %d\n", 340 a_len, nSubframe_Length); 341 goto exit; 342 } 343 /* move the data point to data content */ 344 pdata += ETH_HLEN; 345 a_len -= ETH_HLEN; 346 /* Allocate new skb for releasing to upper layer */ 347 sub_skb = dev_alloc_skb(nSubframe_Length + 12); 348 if (!sub_skb) 349 break; 350 skb_reserve(sub_skb, 12); 351 skb_put_data(sub_skb, pdata, nSubframe_Length); 352 subframes[nr_subframes++] = sub_skb; 353 if (nr_subframes >= MAX_SUBFRAME_COUNT) { 354 netdev_warn(padapter->pnetdev, "r8712u: ParseSubframe(): Too many Subframes! Packets dropped!\n"); 355 break; 356 } 357 pdata += nSubframe_Length; 358 a_len -= nSubframe_Length; 359 if (a_len != 0) { 360 padding_len = 4 - ((nSubframe_Length + ETH_HLEN) & 3); 361 if (padding_len == 4) 362 padding_len = 0; 363 if (a_len < padding_len) 364 goto exit; 365 pdata += padding_len; 366 a_len -= padding_len; 367 } 368 } 369 for (i = 0; i < nr_subframes; i++) { 370 sub_skb = subframes[i]; 371 /* convert hdr + possible LLC headers into Ethernet header */ 372 eth_type = (sub_skb->data[6] << 8) | sub_skb->data[7]; 373 if (sub_skb->len >= 8 && 374 ((!memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) && 375 eth_type != ETH_P_AARP && eth_type != ETH_P_IPX) || 376 !memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE))) { 377 /* remove RFC1042 or Bridge-Tunnel encapsulation and 378 * replace EtherType 379 */ 380 skb_pull(sub_skb, SNAP_SIZE); 381 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src, 382 ETH_ALEN); 383 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst, 384 ETH_ALEN); 385 } else { 386 __be16 len; 387 /* Leave Ethernet header part of hdr and full payload */ 388 len = htons(sub_skb->len); 389 memcpy(skb_push(sub_skb, 2), &len, 2); 390 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->src, 391 ETH_ALEN); 392 memcpy(skb_push(sub_skb, ETH_ALEN), pattrib->dst, 393 ETH_ALEN); 394 } 395 /* Indicate the packets to upper layer */ 396 if (sub_skb) { 397 sub_skb->protocol = 398 eth_type_trans(sub_skb, padapter->pnetdev); 399 sub_skb->dev = padapter->pnetdev; 400 if ((pattrib->tcpchk_valid == 1) && 401 (pattrib->tcp_chkrpt == 1)) { 402 sub_skb->ip_summed = CHECKSUM_UNNECESSARY; 403 } else { 404 sub_skb->ip_summed = CHECKSUM_NONE; 405 } 406 netif_rx(sub_skb); 407 } 408 } 409 exit: 410 prframe->u.hdr.len = 0; 411 r8712_free_recvframe(prframe, pfree_recv_queue); 412 } 413 414 void r8712_rxcmd_event_hdl(struct _adapter *padapter, void *prxcmdbuf) 415 { 416 __le32 voffset; 417 u8 *poffset; 418 u16 cmd_len, drvinfo_sz; 419 struct recv_stat *prxstat; 420 421 poffset = prxcmdbuf; 422 voffset = *(__le32 *)poffset; 423 prxstat = prxcmdbuf; 424 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16; 425 drvinfo_sz <<= 3; 426 poffset += RXDESC_SIZE + drvinfo_sz; 427 do { 428 voffset = *(__le32 *)poffset; 429 cmd_len = (u16)(le32_to_cpu(voffset) & 0xffff); 430 r8712_event_handle(padapter, (__le32 *)poffset); 431 poffset += (cmd_len + 8);/*8 bytes alignment*/ 432 } while (le32_to_cpu(voffset) & BIT(31)); 433 } 434 435 static int check_indicate_seq(struct recv_reorder_ctrl *preorder_ctrl, 436 u16 seq_num) 437 { 438 u8 wsize = preorder_ctrl->wsize_b; 439 u16 wend = (preorder_ctrl->indicate_seq + wsize - 1) % 4096; 440 441 /* Rx Reorder initialize condition.*/ 442 if (preorder_ctrl->indicate_seq == 0xffff) 443 preorder_ctrl->indicate_seq = seq_num; 444 /* Drop out the packet which SeqNum is smaller than WinStart */ 445 if (SN_LESS(seq_num, preorder_ctrl->indicate_seq)) 446 return false; 447 /* 448 * Sliding window manipulation. Conditions includes: 449 * 1. Incoming SeqNum is equal to WinStart =>Window shift 1 450 * 2. Incoming SeqNum is larger than the WinEnd => Window shift N 451 */ 452 if (SN_EQUAL(seq_num, preorder_ctrl->indicate_seq)) 453 preorder_ctrl->indicate_seq = (preorder_ctrl->indicate_seq + 454 1) % 4096; 455 else if (SN_LESS(wend, seq_num)) { 456 if (seq_num >= (wsize - 1)) 457 preorder_ctrl->indicate_seq = seq_num + 1 - wsize; 458 else 459 preorder_ctrl->indicate_seq = 4095 - (wsize - 460 (seq_num + 1)) + 1; 461 } 462 return true; 463 } 464 465 static int enqueue_reorder_recvframe(struct recv_reorder_ctrl *preorder_ctrl, 466 union recv_frame *prframe) 467 { 468 struct list_head *phead, *plist; 469 union recv_frame *pnextrframe; 470 struct rx_pkt_attrib *pnextattrib; 471 struct __queue *ppending_recvframe_queue = 472 &preorder_ctrl->pending_recvframe_queue; 473 struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib; 474 475 phead = &ppending_recvframe_queue->queue; 476 plist = phead->next; 477 while (!end_of_queue_search(phead, plist)) { 478 pnextrframe = container_of(plist, union recv_frame, u.list); 479 pnextattrib = &pnextrframe->u.hdr.attrib; 480 481 if (SN_EQUAL(pnextattrib->seq_num, pattrib->seq_num)) 482 return false; 483 484 if (SN_LESS(pnextattrib->seq_num, pattrib->seq_num)) 485 plist = plist->next; 486 else 487 break; 488 } 489 list_del_init(&prframe->u.hdr.list); 490 list_add_tail(&prframe->u.hdr.list, plist); 491 return true; 492 } 493 494 int r8712_recv_indicatepkts_in_order(struct _adapter *padapter, 495 struct recv_reorder_ctrl *preorder_ctrl, 496 int bforced) 497 { 498 struct list_head *phead, *plist; 499 union recv_frame *prframe; 500 struct rx_pkt_attrib *pattrib; 501 int bPktInBuf = false; 502 struct __queue *ppending_recvframe_queue = 503 &preorder_ctrl->pending_recvframe_queue; 504 505 phead = &ppending_recvframe_queue->queue; 506 plist = phead->next; 507 /* Handling some condition for forced indicate case.*/ 508 if (bforced) { 509 if (list_empty(phead)) 510 return true; 511 512 prframe = container_of(plist, union recv_frame, u.list); 513 pattrib = &prframe->u.hdr.attrib; 514 preorder_ctrl->indicate_seq = pattrib->seq_num; 515 } 516 /* Prepare indication list and indication. 517 * Check if there is any packet need indicate. 518 */ 519 while (!list_empty(phead)) { 520 prframe = container_of(plist, union recv_frame, u.list); 521 pattrib = &prframe->u.hdr.attrib; 522 if (!SN_LESS(preorder_ctrl->indicate_seq, pattrib->seq_num)) { 523 plist = plist->next; 524 list_del_init(&prframe->u.hdr.list); 525 if (SN_EQUAL(preorder_ctrl->indicate_seq, 526 pattrib->seq_num)) 527 preorder_ctrl->indicate_seq = 528 (preorder_ctrl->indicate_seq + 1) % 4096; 529 /*indicate this recv_frame*/ 530 if (!pattrib->amsdu) { 531 if (!padapter->driver_stopped && 532 !padapter->surprise_removed) { 533 /* indicate this recv_frame */ 534 r8712_recv_indicatepkt(padapter, 535 prframe); 536 } 537 } else if (pattrib->amsdu == 1) { 538 amsdu_to_msdu(padapter, prframe); 539 } 540 /* Update local variables. */ 541 bPktInBuf = false; 542 } else { 543 bPktInBuf = true; 544 break; 545 } 546 } 547 return bPktInBuf; 548 } 549 550 static int recv_indicatepkt_reorder(struct _adapter *padapter, 551 union recv_frame *prframe) 552 { 553 unsigned long irql; 554 struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib; 555 struct recv_reorder_ctrl *preorder_ctrl = prframe->u.hdr.preorder_ctrl; 556 struct __queue *ppending_recvframe_queue = 557 &preorder_ctrl->pending_recvframe_queue; 558 559 if (!pattrib->amsdu) { 560 /* s1. */ 561 r8712_wlanhdr_to_ethhdr(prframe); 562 if (pattrib->qos != 1) { 563 if (!padapter->driver_stopped && 564 !padapter->surprise_removed) { 565 r8712_recv_indicatepkt(padapter, prframe); 566 return 0; 567 } else { 568 return -EINVAL; 569 } 570 } 571 } 572 spin_lock_irqsave(&ppending_recvframe_queue->lock, irql); 573 /*s2. check if winstart_b(indicate_seq) needs to be updated*/ 574 if (!check_indicate_seq(preorder_ctrl, pattrib->seq_num)) 575 goto _err_exit; 576 /*s3. Insert all packet into Reorder Queue to maintain its ordering.*/ 577 if (!enqueue_reorder_recvframe(preorder_ctrl, prframe)) 578 goto _err_exit; 579 /*s4. 580 * Indication process. 581 * After Packet dropping and Sliding Window shifting as above, we can 582 * now just indicate the packets with the SeqNum smaller than latest 583 * WinStart and buffer other packets. 584 * 585 * For Rx Reorder condition: 586 * 1. All packets with SeqNum smaller than WinStart => Indicate 587 * 2. All packets with SeqNum larger than or equal to 588 * WinStart => Buffer it. 589 */ 590 if (r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, false)) { 591 mod_timer(&preorder_ctrl->reordering_ctrl_timer, 592 jiffies + msecs_to_jiffies(REORDER_WAIT_TIME)); 593 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql); 594 } else { 595 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql); 596 del_timer(&preorder_ctrl->reordering_ctrl_timer); 597 } 598 return 0; 599 _err_exit: 600 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql); 601 return -ENOMEM; 602 } 603 604 void r8712_reordering_ctrl_timeout_handler(void *pcontext) 605 { 606 unsigned long irql; 607 struct recv_reorder_ctrl *preorder_ctrl = pcontext; 608 struct _adapter *padapter = preorder_ctrl->padapter; 609 struct __queue *ppending_recvframe_queue = 610 &preorder_ctrl->pending_recvframe_queue; 611 612 if (padapter->driver_stopped || padapter->surprise_removed) 613 return; 614 spin_lock_irqsave(&ppending_recvframe_queue->lock, irql); 615 r8712_recv_indicatepkts_in_order(padapter, preorder_ctrl, true); 616 spin_unlock_irqrestore(&ppending_recvframe_queue->lock, irql); 617 } 618 619 static int r8712_process_recv_indicatepkts(struct _adapter *padapter, 620 union recv_frame *prframe) 621 { 622 int retval = _SUCCESS; 623 struct mlme_priv *pmlmepriv = &padapter->mlmepriv; 624 struct ht_priv *phtpriv = &pmlmepriv->htpriv; 625 626 if (phtpriv->ht_option == 1) { /*B/G/N Mode*/ 627 if (recv_indicatepkt_reorder(padapter, prframe)) { 628 /* including perform A-MPDU Rx Ordering Buffer Control*/ 629 if (!padapter->driver_stopped && 630 !padapter->surprise_removed) 631 return _FAIL; 632 } 633 } else { /*B/G mode*/ 634 retval = r8712_wlanhdr_to_ethhdr(prframe); 635 if (retval) 636 return _FAIL; 637 if (!padapter->driver_stopped && !padapter->surprise_removed) { 638 /* indicate this recv_frame */ 639 r8712_recv_indicatepkt(padapter, prframe); 640 } else { 641 return _FAIL; 642 } 643 } 644 return retval; 645 } 646 647 static u8 query_rx_pwr_percentage(s8 antpower) 648 { 649 if ((antpower <= -100) || (antpower >= 20)) 650 return 0; 651 else if (antpower >= 0) 652 return 100; 653 else 654 return 100 + antpower; 655 } 656 657 static u8 evm_db2percentage(s8 value) 658 { 659 /* 660 * -33dB~0dB to 0%~99% 661 */ 662 s8 ret_val = clamp(-value, 0, 33) * 3; 663 664 if (ret_val == 99) 665 ret_val = 100; 666 667 return ret_val; 668 } 669 670 s32 r8712_signal_scale_mapping(s32 cur_sig) 671 { 672 s32 ret_sig; 673 674 if (cur_sig >= 51 && cur_sig <= 100) 675 ret_sig = 100; 676 else if (cur_sig >= 41 && cur_sig <= 50) 677 ret_sig = 80 + ((cur_sig - 40) * 2); 678 else if (cur_sig >= 31 && cur_sig <= 40) 679 ret_sig = 66 + (cur_sig - 30); 680 else if (cur_sig >= 21 && cur_sig <= 30) 681 ret_sig = 54 + (cur_sig - 20); 682 else if (cur_sig >= 10 && cur_sig <= 20) 683 ret_sig = 42 + (((cur_sig - 10) * 2) / 3); 684 else if (cur_sig >= 5 && cur_sig <= 9) 685 ret_sig = 22 + (((cur_sig - 5) * 3) / 2); 686 else if (cur_sig >= 1 && cur_sig <= 4) 687 ret_sig = 6 + (((cur_sig - 1) * 3) / 2); 688 else 689 ret_sig = cur_sig; 690 return ret_sig; 691 } 692 693 static s32 translate2dbm(struct _adapter *padapter, u8 signal_strength_idx) 694 { 695 s32 signal_power; /* in dBm.*/ 696 /* Translate to dBm (x=0.5y-95).*/ 697 signal_power = (s32)((signal_strength_idx + 1) >> 1); 698 signal_power -= 95; 699 return signal_power; 700 } 701 702 static void query_rx_phy_status(struct _adapter *padapter, 703 union recv_frame *prframe) 704 { 705 u8 i, max_spatial_stream, evm; 706 struct recv_stat *prxstat = (struct recv_stat *)prframe->u.hdr.rx_head; 707 struct phy_stat *pphy_stat = (struct phy_stat *)(prxstat + 1); 708 u8 *pphy_head = (u8 *)(prxstat + 1); 709 s8 rx_pwr[4], rx_pwr_all; 710 u8 pwdb_all; 711 u32 rssi, total_rssi = 0; 712 u8 bcck_rate = 0, rf_rx_num = 0, cck_highpwr = 0; 713 struct phy_cck_rx_status *pcck_buf; 714 u8 sq; 715 716 /* Record it for next packet processing*/ 717 bcck_rate = (prframe->u.hdr.attrib.mcs_rate <= 3 ? 1 : 0); 718 if (bcck_rate) { 719 u8 report; 720 721 /* CCK Driver info Structure is not the same as OFDM packet.*/ 722 pcck_buf = (struct phy_cck_rx_status *)pphy_stat; 723 /* (1)Hardware does not provide RSSI for CCK 724 * (2)PWDB, Average PWDB calculated by hardware 725 * (for rate adaptive) 726 */ 727 if (!cck_highpwr) { 728 report = pcck_buf->cck_agc_rpt & 0xc0; 729 report >>= 6; 730 switch (report) { 731 /* Modify the RF RNA gain value to -40, -20, 732 * -2, 14 by Jenyu's suggestion 733 * Note: different RF with the different 734 * RNA gain. 735 */ 736 case 0x3: 737 rx_pwr_all = -40 - (pcck_buf->cck_agc_rpt & 738 0x3e); 739 break; 740 case 0x2: 741 rx_pwr_all = -20 - (pcck_buf->cck_agc_rpt & 742 0x3e); 743 break; 744 case 0x1: 745 rx_pwr_all = -2 - (pcck_buf->cck_agc_rpt & 746 0x3e); 747 break; 748 case 0x0: 749 rx_pwr_all = 14 - (pcck_buf->cck_agc_rpt & 750 0x3e); 751 break; 752 } 753 } else { 754 report = ((u8)(le32_to_cpu(pphy_stat->phydw1) >> 8)) & 755 0x60; 756 report >>= 5; 757 switch (report) { 758 case 0x3: 759 rx_pwr_all = -40 - ((pcck_buf->cck_agc_rpt & 760 0x1f) << 1); 761 break; 762 case 0x2: 763 rx_pwr_all = -20 - ((pcck_buf->cck_agc_rpt & 764 0x1f) << 1); 765 break; 766 case 0x1: 767 rx_pwr_all = -2 - ((pcck_buf->cck_agc_rpt & 768 0x1f) << 1); 769 break; 770 case 0x0: 771 rx_pwr_all = 14 - ((pcck_buf->cck_agc_rpt & 772 0x1f) << 1); 773 break; 774 } 775 } 776 pwdb_all = query_rx_pwr_percentage(rx_pwr_all); 777 /* CCK gain is smaller than OFDM/MCS gain,*/ 778 /* so we add gain diff by experiences, the val is 6 */ 779 pwdb_all += 6; 780 if (pwdb_all > 100) 781 pwdb_all = 100; 782 /* modify the offset to make the same gain index with OFDM.*/ 783 if (pwdb_all > 34 && pwdb_all <= 42) 784 pwdb_all -= 2; 785 else if (pwdb_all > 26 && pwdb_all <= 34) 786 pwdb_all -= 6; 787 else if (pwdb_all > 14 && pwdb_all <= 26) 788 pwdb_all -= 8; 789 else if (pwdb_all > 4 && pwdb_all <= 14) 790 pwdb_all -= 4; 791 /* 792 * (3) Get Signal Quality (EVM) 793 */ 794 if (pwdb_all > 40) { 795 sq = 100; 796 } else { 797 sq = pcck_buf->sq_rpt; 798 if (pcck_buf->sq_rpt > 64) 799 sq = 0; 800 else if (pcck_buf->sq_rpt < 20) 801 sq = 100; 802 else 803 sq = ((64 - sq) * 100) / 44; 804 } 805 prframe->u.hdr.attrib.signal_qual = sq; 806 prframe->u.hdr.attrib.rx_mimo_signal_qual[0] = sq; 807 prframe->u.hdr.attrib.rx_mimo_signal_qual[1] = -1; 808 } else { 809 /* (1)Get RSSI for HT rate */ 810 for (i = 0; i < ((padapter->registrypriv.rf_config) & 811 0x0f); i++) { 812 rf_rx_num++; 813 rx_pwr[i] = ((pphy_head[PHY_STAT_GAIN_TRSW_SHT + i] 814 & 0x3F) * 2) - 110; 815 /* Translate DBM to percentage. */ 816 rssi = query_rx_pwr_percentage(rx_pwr[i]); 817 total_rssi += rssi; 818 } 819 /* (2)PWDB, Average PWDB calculated by hardware (for 820 * rate adaptive) 821 */ 822 rx_pwr_all = (((pphy_head[PHY_STAT_PWDB_ALL_SHT]) >> 1) & 0x7f) 823 - 106; 824 pwdb_all = query_rx_pwr_percentage(rx_pwr_all); 825 826 { 827 /* (3)EVM of HT rate */ 828 if (prframe->u.hdr.attrib.htc && 829 prframe->u.hdr.attrib.mcs_rate >= 20 && 830 prframe->u.hdr.attrib.mcs_rate <= 27) { 831 /* both spatial stream make sense */ 832 max_spatial_stream = 2; 833 } else { 834 /* only spatial stream 1 makes sense */ 835 max_spatial_stream = 1; 836 } 837 for (i = 0; i < max_spatial_stream; i++) { 838 evm = evm_db2percentage((pphy_head 839 [PHY_STAT_RXEVM_SHT + i]));/*dbm*/ 840 prframe->u.hdr.attrib.signal_qual = 841 (u8)(evm & 0xff); 842 prframe->u.hdr.attrib.rx_mimo_signal_qual[i] = 843 (u8)(evm & 0xff); 844 } 845 } 846 } 847 /* UI BSS List signal strength(in percentage), make it good looking, 848 * from 0~100. It is assigned to the BSS List in 849 * GetValueFromBeaconOrProbeRsp(). 850 */ 851 if (bcck_rate) { 852 prframe->u.hdr.attrib.signal_strength = 853 (u8)r8712_signal_scale_mapping(pwdb_all); 854 } else { 855 if (rf_rx_num != 0) 856 prframe->u.hdr.attrib.signal_strength = 857 (u8)(r8712_signal_scale_mapping(total_rssi /= 858 rf_rx_num)); 859 } 860 } 861 862 static void process_link_qual(struct _adapter *padapter, 863 union recv_frame *prframe) 864 { 865 u32 last_evm = 0, tmpVal; 866 struct rx_pkt_attrib *pattrib; 867 struct smooth_rssi_data *sqd = &padapter->recvpriv.signal_qual_data; 868 869 if (!prframe || !padapter) 870 return; 871 pattrib = &prframe->u.hdr.attrib; 872 if (pattrib->signal_qual != 0) { 873 /* 874 * 1. Record the general EVM to the sliding window. 875 */ 876 if (sqd->total_num++ >= PHY_LINKQUALITY_SLID_WIN_MAX) { 877 sqd->total_num = PHY_LINKQUALITY_SLID_WIN_MAX; 878 last_evm = sqd->elements[sqd->index]; 879 sqd->total_val -= last_evm; 880 } 881 sqd->total_val += pattrib->signal_qual; 882 sqd->elements[sqd->index++] = pattrib->signal_qual; 883 if (sqd->index >= PHY_LINKQUALITY_SLID_WIN_MAX) 884 sqd->index = 0; 885 886 /* <1> Showed on UI for user, in percentage. */ 887 tmpVal = sqd->total_val / sqd->total_num; 888 padapter->recvpriv.signal = (u8)tmpVal; 889 } 890 } 891 892 static void process_rssi(struct _adapter *padapter, union recv_frame *prframe) 893 { 894 u32 last_rssi, tmp_val; 895 struct rx_pkt_attrib *pattrib = &prframe->u.hdr.attrib; 896 struct smooth_rssi_data *ssd = &padapter->recvpriv.signal_strength_data; 897 898 if (ssd->total_num++ >= PHY_RSSI_SLID_WIN_MAX) { 899 ssd->total_num = PHY_RSSI_SLID_WIN_MAX; 900 last_rssi = ssd->elements[ssd->index]; 901 ssd->total_val -= last_rssi; 902 } 903 ssd->total_val += pattrib->signal_strength; 904 ssd->elements[ssd->index++] = pattrib->signal_strength; 905 if (ssd->index >= PHY_RSSI_SLID_WIN_MAX) 906 ssd->index = 0; 907 tmp_val = ssd->total_val / ssd->total_num; 908 padapter->recvpriv.rssi = (s8)translate2dbm(padapter, (u8)tmp_val); 909 } 910 911 static void process_phy_info(struct _adapter *padapter, 912 union recv_frame *prframe) 913 { 914 query_rx_phy_status(padapter, prframe); 915 process_rssi(padapter, prframe); 916 process_link_qual(padapter, prframe); 917 } 918 919 int recv_func(struct _adapter *padapter, void *pcontext) 920 { 921 struct rx_pkt_attrib *pattrib; 922 union recv_frame *prframe, *orig_prframe; 923 int retval = _SUCCESS; 924 struct __queue *pfree_recv_queue = &padapter->recvpriv.free_recv_queue; 925 struct mlme_priv *pmlmepriv = &padapter->mlmepriv; 926 927 prframe = pcontext; 928 orig_prframe = prframe; 929 pattrib = &prframe->u.hdr.attrib; 930 if (check_fwstate(pmlmepriv, WIFI_MP_STATE)) { 931 if (pattrib->crc_err == 1) 932 padapter->mppriv.rx_crcerrpktcount++; 933 else 934 padapter->mppriv.rx_pktcount++; 935 if (!check_fwstate(pmlmepriv, WIFI_MP_LPBK_STATE)) { 936 /* free this recv_frame */ 937 r8712_free_recvframe(orig_prframe, pfree_recv_queue); 938 goto _exit_recv_func; 939 } 940 } 941 /* check the frame crtl field and decache */ 942 retval = r8712_validate_recv_frame(padapter, prframe); 943 if (retval != _SUCCESS) { 944 /* free this recv_frame */ 945 r8712_free_recvframe(orig_prframe, pfree_recv_queue); 946 goto _exit_recv_func; 947 } 948 process_phy_info(padapter, prframe); 949 prframe = r8712_decryptor(padapter, prframe); 950 if (!prframe) { 951 retval = _FAIL; 952 goto _exit_recv_func; 953 } 954 prframe = r8712_recvframe_chk_defrag(padapter, prframe); 955 if (!prframe) 956 goto _exit_recv_func; 957 prframe = r8712_portctrl(padapter, prframe); 958 if (!prframe) { 959 retval = _FAIL; 960 goto _exit_recv_func; 961 } 962 retval = r8712_process_recv_indicatepkts(padapter, prframe); 963 if (retval != _SUCCESS) { 964 r8712_free_recvframe(orig_prframe, pfree_recv_queue); 965 goto _exit_recv_func; 966 } 967 _exit_recv_func: 968 return retval; 969 } 970 971 static void recvbuf2recvframe(struct _adapter *padapter, struct sk_buff *pskb) 972 { 973 u8 *pbuf, shift_sz = 0; 974 u8 frag, mf; 975 uint pkt_len; 976 u32 transfer_len; 977 struct recv_stat *prxstat; 978 u16 pkt_cnt, drvinfo_sz, pkt_offset, tmp_len, alloc_sz; 979 struct __queue *pfree_recv_queue; 980 _pkt *pkt_copy = NULL; 981 union recv_frame *precvframe = NULL; 982 struct recv_priv *precvpriv = &padapter->recvpriv; 983 984 pfree_recv_queue = &precvpriv->free_recv_queue; 985 pbuf = pskb->data; 986 prxstat = (struct recv_stat *)pbuf; 987 pkt_cnt = (le32_to_cpu(prxstat->rxdw2) >> 16) & 0xff; 988 pkt_len = le32_to_cpu(prxstat->rxdw0) & 0x00003fff; 989 transfer_len = pskb->len; 990 /* Test throughput with Netgear 3700 (No security) with Chariot 3T3R 991 * pairs. The packet count will be a big number so that the containing 992 * packet will effect the Rx reordering. 993 */ 994 if (transfer_len < pkt_len) { 995 /* In this case, it means the MAX_RECVBUF_SZ is too small to 996 * get the data from 8712u. 997 */ 998 return; 999 } 1000 do { 1001 prxstat = (struct recv_stat *)pbuf; 1002 pkt_len = le32_to_cpu(prxstat->rxdw0) & 0x00003fff; 1003 /* more fragment bit */ 1004 mf = (le32_to_cpu(prxstat->rxdw1) >> 27) & 0x1; 1005 /* ragmentation number */ 1006 frag = (le32_to_cpu(prxstat->rxdw2) >> 12) & 0xf; 1007 /* uint 2^3 = 8 bytes */ 1008 drvinfo_sz = (le32_to_cpu(prxstat->rxdw0) & 0x000f0000) >> 16; 1009 drvinfo_sz <<= 3; 1010 if (pkt_len <= 0) 1011 return; 1012 /* Qos data, wireless lan header length is 26 */ 1013 if ((le32_to_cpu(prxstat->rxdw0) >> 23) & 0x01) 1014 shift_sz = 2; 1015 precvframe = r8712_alloc_recvframe(pfree_recv_queue); 1016 if (!precvframe) 1017 return; 1018 INIT_LIST_HEAD(&precvframe->u.hdr.list); 1019 precvframe->u.hdr.precvbuf = NULL; /*can't access the precvbuf*/ 1020 precvframe->u.hdr.len = 0; 1021 tmp_len = pkt_len + drvinfo_sz + RXDESC_SIZE; 1022 pkt_offset = (u16)round_up(tmp_len, 128); 1023 /* for first fragment packet, driver need allocate 1536 + 1024 * drvinfo_sz + RXDESC_SIZE to defrag packet. 1025 */ 1026 if ((mf == 1) && (frag == 0)) 1027 /*1658+6=1664, 1664 is 128 alignment.*/ 1028 alloc_sz = max_t(u16, tmp_len, 1658); 1029 else 1030 alloc_sz = tmp_len; 1031 /* 2 is for IP header 4 bytes alignment in QoS packet case. 1032 * 4 is for skb->data 4 bytes alignment. 1033 */ 1034 alloc_sz += 6; 1035 pkt_copy = netdev_alloc_skb(padapter->pnetdev, alloc_sz); 1036 if (!pkt_copy) 1037 return; 1038 1039 precvframe->u.hdr.pkt = pkt_copy; 1040 skb_reserve(pkt_copy, 4 - ((addr_t)(pkt_copy->data) % 4)); 1041 skb_reserve(pkt_copy, shift_sz); 1042 memcpy(pkt_copy->data, pbuf, tmp_len); 1043 precvframe->u.hdr.rx_head = pkt_copy->data; 1044 precvframe->u.hdr.rx_data = pkt_copy->data; 1045 precvframe->u.hdr.rx_tail = pkt_copy->data; 1046 precvframe->u.hdr.rx_end = pkt_copy->data + alloc_sz; 1047 1048 recvframe_put(precvframe, tmp_len); 1049 recvframe_pull(precvframe, drvinfo_sz + RXDESC_SIZE); 1050 /* because the endian issue, driver avoid reference to the 1051 * rxstat after calling update_recvframe_attrib_from_recvstat(); 1052 */ 1053 update_recvframe_attrib_from_recvstat(&precvframe->u.hdr.attrib, 1054 prxstat); 1055 r8712_recv_entry(precvframe); 1056 transfer_len -= pkt_offset; 1057 pbuf += pkt_offset; 1058 pkt_cnt--; 1059 precvframe = NULL; 1060 pkt_copy = NULL; 1061 } while ((transfer_len > 0) && pkt_cnt > 0); 1062 } 1063 1064 static void recv_tasklet(struct tasklet_struct *t) 1065 { 1066 struct sk_buff *pskb; 1067 struct _adapter *padapter = from_tasklet(padapter, t, 1068 recvpriv.recv_tasklet); 1069 struct recv_priv *precvpriv = &padapter->recvpriv; 1070 1071 while (NULL != (pskb = skb_dequeue(&precvpriv->rx_skb_queue))) { 1072 recvbuf2recvframe(padapter, pskb); 1073 skb_reset_tail_pointer(pskb); 1074 pskb->len = 0; 1075 if (!skb_cloned(pskb)) 1076 skb_queue_tail(&precvpriv->free_recv_skb_queue, pskb); 1077 else 1078 consume_skb(pskb); 1079 } 1080 } 1081