1 /*
2  * Marvell Wireless LAN device driver: 802.11n Aggregation
3  *
4  * Copyright (C) 2011-2014, Marvell International Ltd.
5  *
6  * This software file (the "File") is distributed by Marvell International
7  * Ltd. under the terms of the GNU General Public License Version 2, June 1991
8  * (the "License").  You may use, redistribute and/or modify this File in
9  * accordance with the terms and conditions of the License, a copy of which
10  * is available by writing to the Free Software Foundation, Inc.,
11  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA or on the
12  * worldwide web at http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt.
13  *
14  * THE FILE IS DISTRIBUTED AS-IS, WITHOUT WARRANTY OF ANY KIND, AND THE
15  * IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE
16  * ARE EXPRESSLY DISCLAIMED.  The License provides additional details about
17  * this warranty disclaimer.
18  */
19 
20 #include "decl.h"
21 #include "ioctl.h"
22 #include "util.h"
23 #include "fw.h"
24 #include "main.h"
25 #include "wmm.h"
26 #include "11n.h"
27 #include "11n_aggr.h"
28 
29 /*
30  * Creates an AMSDU subframe for aggregation into one AMSDU packet.
31  *
32  * The resultant AMSDU subframe format is -
33  *
34  * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
35  * |     DA     |     SA      |   Length   | SNAP header |   MSDU     |
36  * | data[0..5] | data[6..11] |            |             | data[14..] |
37  * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
38  * <--6-bytes--> <--6-bytes--> <--2-bytes--><--8-bytes--> <--n-bytes-->
39  *
40  * This function also computes the amount of padding required to make the
41  * buffer length multiple of 4 bytes.
42  *
43  * Data => |DA|SA|SNAP-TYPE|........    .|
44  * MSDU => |DA|SA|Length|SNAP|......   ..|
45  */
46 static int
47 mwifiex_11n_form_amsdu_pkt(struct sk_buff *skb_aggr,
48 			   struct sk_buff *skb_src, int *pad)
49 
50 {
51 	int dt_offset;
52 	struct rfc_1042_hdr snap = {
53 		0xaa,		/* LLC DSAP */
54 		0xaa,		/* LLC SSAP */
55 		0x03,		/* LLC CTRL */
56 		{0x00, 0x00, 0x00},	/* SNAP OUI */
57 		0x0000		/* SNAP type */
58 			/*
59 			 * This field will be overwritten
60 			 * later with ethertype
61 			 */
62 	};
63 	struct tx_packet_hdr *tx_header;
64 
65 	tx_header = (void *)skb_put(skb_aggr, sizeof(*tx_header));
66 
67 	/* Copy DA and SA */
68 	dt_offset = 2 * ETH_ALEN;
69 	memcpy(&tx_header->eth803_hdr, skb_src->data, dt_offset);
70 
71 	/* Copy SNAP header */
72 	snap.snap_type = ((struct ethhdr *)skb_src->data)->h_proto;
73 
74 	dt_offset += sizeof(__be16);
75 
76 	memcpy(&tx_header->rfc1042_hdr, &snap, sizeof(struct rfc_1042_hdr));
77 
78 	skb_pull(skb_src, dt_offset);
79 
80 	/* Update Length field */
81 	tx_header->eth803_hdr.h_proto = htons(skb_src->len + LLC_SNAP_LEN);
82 
83 	/* Add payload */
84 	memcpy(skb_put(skb_aggr, skb_src->len), skb_src->data, skb_src->len);
85 
86 	/* Add padding for new MSDU to start from 4 byte boundary */
87 	*pad = (4 - ((unsigned long)skb_aggr->tail & 0x3)) % 4;
88 
89 	return skb_aggr->len + *pad;
90 }
91 
92 /*
93  * Adds TxPD to AMSDU header.
94  *
95  * Each AMSDU packet will contain one TxPD at the beginning,
96  * followed by multiple AMSDU subframes.
97  */
98 static void
99 mwifiex_11n_form_amsdu_txpd(struct mwifiex_private *priv,
100 			    struct sk_buff *skb)
101 {
102 	struct txpd *local_tx_pd;
103 	struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
104 	unsigned int pad;
105 	int headroom = (priv->adapter->iface_type ==
106 			MWIFIEX_USB) ? 0 : INTF_HEADER_LEN;
107 
108 	pad = ((void *)skb->data - sizeof(*local_tx_pd) -
109 		headroom - NULL) & (MWIFIEX_DMA_ALIGN_SZ - 1);
110 	skb_push(skb, pad);
111 
112 	skb_push(skb, sizeof(*local_tx_pd));
113 
114 	local_tx_pd = (struct txpd *) skb->data;
115 	memset(local_tx_pd, 0, sizeof(struct txpd));
116 
117 	/* Original priority has been overwritten */
118 	local_tx_pd->priority = (u8) skb->priority;
119 	local_tx_pd->pkt_delay_2ms =
120 		mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
121 	local_tx_pd->bss_num = priv->bss_num;
122 	local_tx_pd->bss_type = priv->bss_type;
123 	/* Always zero as the data is followed by struct txpd */
124 	local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd) +
125 						 pad);
126 	local_tx_pd->tx_pkt_type = cpu_to_le16(PKT_TYPE_AMSDU);
127 	local_tx_pd->tx_pkt_length = cpu_to_le16(skb->len -
128 						 sizeof(*local_tx_pd) -
129 						 pad);
130 
131 	if (tx_info->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
132 		local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_TDLS_PACKET;
133 
134 	if (local_tx_pd->tx_control == 0)
135 		/* TxCtrl set by user or default */
136 		local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
137 
138 	if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
139 	    priv->adapter->pps_uapsd_mode) {
140 		if (true == mwifiex_check_last_packet_indication(priv)) {
141 			priv->adapter->tx_lock_flag = true;
142 			local_tx_pd->flags =
143 				MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
144 		}
145 	}
146 }
147 
148 /*
149  * Create aggregated packet.
150  *
151  * This function creates an aggregated MSDU packet, by combining buffers
152  * from the RA list. Each individual buffer is encapsulated as an AMSDU
153  * subframe and all such subframes are concatenated together to form the
154  * AMSDU packet.
155  *
156  * A TxPD is also added to the front of the resultant AMSDU packets for
157  * transmission. The resultant packets format is -
158  *
159  * +---- ~ ----+------ ~ ------+------ ~ ------+-..-+------ ~ ------+
160  * |    TxPD   |AMSDU sub-frame|AMSDU sub-frame| .. |AMSDU sub-frame|
161  * |           |       1       |       2       | .. |       n       |
162  * +---- ~ ----+------ ~ ------+------ ~ ------+ .. +------ ~ ------+
163  */
164 int
165 mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv,
166 			  struct mwifiex_ra_list_tbl *pra_list,
167 			  int ptrindex, unsigned long ra_list_flags)
168 			  __releases(&priv->wmm.ra_list_spinlock)
169 {
170 	struct mwifiex_adapter *adapter = priv->adapter;
171 	struct sk_buff *skb_aggr, *skb_src;
172 	struct mwifiex_txinfo *tx_info_aggr, *tx_info_src;
173 	int pad = 0, aggr_num = 0, ret;
174 	struct mwifiex_tx_param tx_param;
175 	struct txpd *ptx_pd = NULL;
176 	int headroom = adapter->iface_type == MWIFIEX_USB ? 0 : INTF_HEADER_LEN;
177 
178 	skb_src = skb_peek(&pra_list->skb_head);
179 	if (!skb_src) {
180 		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
181 				       ra_list_flags);
182 		return 0;
183 	}
184 
185 	tx_info_src = MWIFIEX_SKB_TXCB(skb_src);
186 	skb_aggr = mwifiex_alloc_dma_align_buf(adapter->tx_buf_size,
187 					       GFP_ATOMIC | GFP_DMA);
188 	if (!skb_aggr) {
189 		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
190 				       ra_list_flags);
191 		return -1;
192 	}
193 	skb_reserve(skb_aggr, MWIFIEX_MIN_DATA_HEADER_LEN);
194 	tx_info_aggr =  MWIFIEX_SKB_TXCB(skb_aggr);
195 
196 	memset(tx_info_aggr, 0, sizeof(*tx_info_aggr));
197 	tx_info_aggr->bss_type = tx_info_src->bss_type;
198 	tx_info_aggr->bss_num = tx_info_src->bss_num;
199 
200 	if (tx_info_src->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
201 		tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
202 	tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_AGGR_PKT;
203 	skb_aggr->priority = skb_src->priority;
204 	skb_aggr->tstamp = skb_src->tstamp;
205 
206 	do {
207 		/* Check if AMSDU can accommodate this MSDU */
208 		if (skb_tailroom(skb_aggr) < (skb_src->len + LLC_SNAP_LEN))
209 			break;
210 
211 		skb_src = skb_dequeue(&pra_list->skb_head);
212 		pra_list->total_pkt_count--;
213 		atomic_dec(&priv->wmm.tx_pkts_queued);
214 		aggr_num++;
215 		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
216 				       ra_list_flags);
217 		mwifiex_11n_form_amsdu_pkt(skb_aggr, skb_src, &pad);
218 
219 		mwifiex_write_data_complete(adapter, skb_src, 0, 0);
220 
221 		spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
222 
223 		if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
224 			spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
225 					       ra_list_flags);
226 			return -1;
227 		}
228 
229 		if (skb_tailroom(skb_aggr) < pad) {
230 			pad = 0;
231 			break;
232 		}
233 		skb_put(skb_aggr, pad);
234 
235 		skb_src = skb_peek(&pra_list->skb_head);
236 
237 	} while (skb_src);
238 
239 	spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock, ra_list_flags);
240 
241 	/* Last AMSDU packet does not need padding */
242 	skb_trim(skb_aggr, skb_aggr->len - pad);
243 
244 	/* Form AMSDU */
245 	mwifiex_11n_form_amsdu_txpd(priv, skb_aggr);
246 	if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
247 		ptx_pd = (struct txpd *)skb_aggr->data;
248 
249 	skb_push(skb_aggr, headroom);
250 	tx_info_aggr->aggr_num = aggr_num * 2;
251 	if (adapter->data_sent || adapter->tx_lock_flag) {
252 		atomic_add(aggr_num * 2, &adapter->tx_queued);
253 		skb_queue_tail(&adapter->tx_data_q, skb_aggr);
254 		return 0;
255 	}
256 
257 	if (adapter->iface_type == MWIFIEX_USB) {
258 		ret = adapter->if_ops.host_to_card(adapter, priv->usb_port,
259 						   skb_aggr, NULL);
260 	} else {
261 		if (skb_src)
262 			tx_param.next_pkt_len =
263 					skb_src->len + sizeof(struct txpd);
264 		else
265 			tx_param.next_pkt_len = 0;
266 
267 		ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
268 						   skb_aggr, &tx_param);
269 	}
270 	switch (ret) {
271 	case -EBUSY:
272 		spin_lock_irqsave(&priv->wmm.ra_list_spinlock, ra_list_flags);
273 		if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
274 			spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
275 					       ra_list_flags);
276 			mwifiex_write_data_complete(adapter, skb_aggr, 1, -1);
277 			return -1;
278 		}
279 		if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
280 		    adapter->pps_uapsd_mode && adapter->tx_lock_flag) {
281 				priv->adapter->tx_lock_flag = false;
282 				if (ptx_pd)
283 					ptx_pd->flags = 0;
284 		}
285 
286 		skb_queue_tail(&pra_list->skb_head, skb_aggr);
287 
288 		pra_list->total_pkt_count++;
289 
290 		atomic_inc(&priv->wmm.tx_pkts_queued);
291 
292 		tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
293 		spin_unlock_irqrestore(&priv->wmm.ra_list_spinlock,
294 				       ra_list_flags);
295 		mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n");
296 		break;
297 	case -1:
298 		mwifiex_dbg(adapter, ERROR, "%s: host_to_card failed: %#x\n",
299 			    __func__, ret);
300 		adapter->dbg.num_tx_host_to_card_failure++;
301 		mwifiex_write_data_complete(adapter, skb_aggr, 1, ret);
302 		return 0;
303 	case -EINPROGRESS:
304 		break;
305 	case 0:
306 		mwifiex_write_data_complete(adapter, skb_aggr, 1, ret);
307 		break;
308 	default:
309 		break;
310 	}
311 	if (ret != -EBUSY) {
312 		mwifiex_rotate_priolists(priv, pra_list, ptrindex);
313 	}
314 
315 	return 0;
316 }
317