11n_aggr.c

  1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * NXP Wireless LAN device driver: 802.11n Aggregation
  4 *
  5 * Copyright 2011-2020 NXP
  6 */
  7
  8#include "decl.h"
  9#include "ioctl.h"
 10#include "util.h"
 11#include "fw.h"
 12#include "main.h"
 13#include "wmm.h"
 14#include "11n.h"
 15#include "11n_aggr.h"
 16
 17/*
 18 * Creates an AMSDU subframe for aggregation into one AMSDU packet.
 19 *
 20 * The resultant AMSDU subframe format is -
 21 *
 22 * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
 23 * |     DA     |     SA      |   Length   | SNAP header |   MSDU     |
 24 * | data[0..5] | data[6..11] |            |             | data[14..] |
 25 * +---- ~ -----+---- ~ ------+---- ~ -----+----- ~ -----+---- ~ -----+
 26 * <--6-bytes--> <--6-bytes--> <--2-bytes--><--8-bytes--> <--n-bytes-->
 27 *
 28 * This function also computes the amount of padding required to make the
 29 * buffer length multiple of 4 bytes.
 30 *
 31 * Data => |DA|SA|SNAP-TYPE|........    .|
 32 * MSDU => |DA|SA|Length|SNAP|......   ..|
 33 */
 34static int
 35mwifiex_11n_form_amsdu_pkt(struct sk_buff *skb_aggr,
 36			   struct sk_buff *skb_src, int *pad)
 37
 38{
 39	int dt_offset;
 40	struct rfc_1042_hdr snap = {
 41		0xaa,		/* LLC DSAP */
 42		0xaa,		/* LLC SSAP */
 43		0x03,		/* LLC CTRL */
 44		{0x00, 0x00, 0x00},	/* SNAP OUI */
 45		0x0000		/* SNAP type */
 46			/*
 47			 * This field will be overwritten
 48			 * later with ethertype
 49			 */
 50	};
 51	struct tx_packet_hdr *tx_header;
 52
 53	tx_header = skb_put(skb_aggr, sizeof(*tx_header));
 54
 55	/* Copy DA and SA */
 56	dt_offset = 2 * ETH_ALEN;
 57	memcpy(&tx_header->eth803_hdr, skb_src->data, dt_offset);
 58
 59	/* Copy SNAP header */
 60	snap.snap_type = ((struct ethhdr *)skb_src->data)->h_proto;
 61
 62	dt_offset += sizeof(__be16);
 63
 64	memcpy(&tx_header->rfc1042_hdr, &snap, sizeof(struct rfc_1042_hdr));
 65
 66	skb_pull(skb_src, dt_offset);
 67
 68	/* Update Length field */
 69	tx_header->eth803_hdr.h_proto = htons(skb_src->len + LLC_SNAP_LEN);
 70
 71	/* Add payload */
 72	skb_put_data(skb_aggr, skb_src->data, skb_src->len);
 73
 74	/* Add padding for new MSDU to start from 4 byte boundary */
 75	*pad = (4 - ((unsigned long)skb_aggr->tail & 0x3)) % 4;
 76
 77	return skb_aggr->len + *pad;
 78}
 79
 80/*
 81 * Adds TxPD to AMSDU header.
 82 *
 83 * Each AMSDU packet will contain one TxPD at the beginning,
 84 * followed by multiple AMSDU subframes.
 85 */
 86static void
 87mwifiex_11n_form_amsdu_txpd(struct mwifiex_private *priv,
 88			    struct sk_buff *skb)
 89{
 90	struct txpd *local_tx_pd;
 91	struct mwifiex_txinfo *tx_info = MWIFIEX_SKB_TXCB(skb);
 92
 93	skb_push(skb, sizeof(*local_tx_pd));
 94
 95	local_tx_pd = (struct txpd *) skb->data;
 96	memset(local_tx_pd, 0, sizeof(struct txpd));
 97
 98	/* Original priority has been overwritten */
 99	local_tx_pd->priority = (u8) skb->priority;
100	local_tx_pd->pkt_delay_2ms =
101		mwifiex_wmm_compute_drv_pkt_delay(priv, skb);
102	local_tx_pd->bss_num = priv->bss_num;
103	local_tx_pd->bss_type = priv->bss_type;
104	/* Always zero as the data is followed by struct txpd */
105	local_tx_pd->tx_pkt_offset = cpu_to_le16(sizeof(struct txpd));
106	local_tx_pd->tx_pkt_type = cpu_to_le16(PKT_TYPE_AMSDU);
107	local_tx_pd->tx_pkt_length = cpu_to_le16(skb->len -
108						 sizeof(*local_tx_pd));
109
110	if (tx_info->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
111		local_tx_pd->flags |= MWIFIEX_TXPD_FLAGS_TDLS_PACKET;
112
113	if (local_tx_pd->tx_control == 0)
114		/* TxCtrl set by user or default */
115		local_tx_pd->tx_control = cpu_to_le32(priv->pkt_tx_ctrl);
116
117	if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
118	    priv->adapter->pps_uapsd_mode) {
119		if (true == mwifiex_check_last_packet_indication(priv)) {
120			priv->adapter->tx_lock_flag = true;
121			local_tx_pd->flags =
122				MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET;
123		}
124	}
125}
126
127/*
128 * Create aggregated packet.
129 *
130 * This function creates an aggregated MSDU packet, by combining buffers
131 * from the RA list. Each individual buffer is encapsulated as an AMSDU
132 * subframe and all such subframes are concatenated together to form the
133 * AMSDU packet.
134 *
135 * A TxPD is also added to the front of the resultant AMSDU packets for
136 * transmission. The resultant packets format is -
137 *
138 * +---- ~ ----+------ ~ ------+------ ~ ------+-..-+------ ~ ------+
139 * |    TxPD   |AMSDU sub-frame|AMSDU sub-frame| .. |AMSDU sub-frame|
140 * |           |       1       |       2       | .. |       n       |
141 * +---- ~ ----+------ ~ ------+------ ~ ------+ .. +------ ~ ------+
142 */
143int
144mwifiex_11n_aggregate_pkt(struct mwifiex_private *priv,
145			  struct mwifiex_ra_list_tbl *pra_list,
146			  int ptrindex)
147			  __releases(&priv->wmm.ra_list_spinlock)
148{
149	struct mwifiex_adapter *adapter = priv->adapter;
150	struct sk_buff *skb_aggr, *skb_src;
151	struct mwifiex_txinfo *tx_info_aggr, *tx_info_src;
152	int pad = 0, aggr_num = 0, ret;
153	struct mwifiex_tx_param tx_param;
154	struct txpd *ptx_pd = NULL;
155	int headroom = adapter->intf_hdr_len;
156
157	skb_src = skb_peek(&pra_list->skb_head);
158	if (!skb_src) {
159		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
160		return 0;
161	}
162
163	tx_info_src = MWIFIEX_SKB_TXCB(skb_src);
164	skb_aggr = mwifiex_alloc_dma_align_buf(adapter->tx_buf_size,
165					       GFP_ATOMIC);
166	if (!skb_aggr) {
167		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
168		return -1;
169	}
170
171	/* skb_aggr->data already 64 byte align, just reserve bus interface
172	 * header and txpd.
173	 */
174	skb_reserve(skb_aggr, headroom + sizeof(struct txpd));
175	tx_info_aggr =  MWIFIEX_SKB_TXCB(skb_aggr);
176
177	memset(tx_info_aggr, 0, sizeof(*tx_info_aggr));
178	tx_info_aggr->bss_type = tx_info_src->bss_type;
179	tx_info_aggr->bss_num = tx_info_src->bss_num;
180
181	if (tx_info_src->flags & MWIFIEX_BUF_FLAG_TDLS_PKT)
182		tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_TDLS_PKT;
183	tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_AGGR_PKT;
184	skb_aggr->priority = skb_src->priority;
185	skb_aggr->tstamp = skb_src->tstamp;
186
187	do {
188		/* Check if AMSDU can accommodate this MSDU */
189		if ((skb_aggr->len + skb_src->len + LLC_SNAP_LEN) >
190		    adapter->tx_buf_size)
191			break;
192
193		skb_src = skb_dequeue(&pra_list->skb_head);
194		pra_list->total_pkt_count--;
195		atomic_dec(&priv->wmm.tx_pkts_queued);
196		aggr_num++;
197		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
198		mwifiex_11n_form_amsdu_pkt(skb_aggr, skb_src, &pad);
199
200		mwifiex_write_data_complete(adapter, skb_src, 0, 0);
201
202		spin_lock_bh(&priv->wmm.ra_list_spinlock);
203
204		if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
205			spin_unlock_bh(&priv->wmm.ra_list_spinlock);
206			return -1;
207		}
208
209		if (skb_tailroom(skb_aggr) < pad) {
210			pad = 0;
211			break;
212		}
213		skb_put(skb_aggr, pad);
214
215		skb_src = skb_peek(&pra_list->skb_head);
216
217	} while (skb_src);
218
219	spin_unlock_bh(&priv->wmm.ra_list_spinlock);
220
221	/* Last AMSDU packet does not need padding */
222	skb_trim(skb_aggr, skb_aggr->len - pad);
223
224	/* Form AMSDU */
225	mwifiex_11n_form_amsdu_txpd(priv, skb_aggr);
226	if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA)
227		ptx_pd = (struct txpd *)skb_aggr->data;
228
229	skb_push(skb_aggr, headroom);
230	tx_info_aggr->aggr_num = aggr_num * 2;
231	if (adapter->data_sent || adapter->tx_lock_flag) {
232		atomic_add(aggr_num * 2, &adapter->tx_queued);
233		skb_queue_tail(&adapter->tx_data_q, skb_aggr);
234		return 0;
235	}
236
237	if (skb_src)
238		tx_param.next_pkt_len = skb_src->len + sizeof(struct txpd);
239	else
240		tx_param.next_pkt_len = 0;
241
242	if (adapter->iface_type == MWIFIEX_USB) {
243		ret = adapter->if_ops.host_to_card(adapter, priv->usb_port,
244						   skb_aggr, &tx_param);
245	} else {
246
247		ret = adapter->if_ops.host_to_card(adapter, MWIFIEX_TYPE_DATA,
248						   skb_aggr, &tx_param);
249	}
250	switch (ret) {
251	case -EBUSY:
252		spin_lock_bh(&priv->wmm.ra_list_spinlock);
253		if (!mwifiex_is_ralist_valid(priv, pra_list, ptrindex)) {
254			spin_unlock_bh(&priv->wmm.ra_list_spinlock);
255			mwifiex_write_data_complete(adapter, skb_aggr, 1, -1);
256			return -1;
257		}
258		if (GET_BSS_ROLE(priv) == MWIFIEX_BSS_ROLE_STA &&
259		    adapter->pps_uapsd_mode && adapter->tx_lock_flag) {
260				priv->adapter->tx_lock_flag = false;
261				if (ptx_pd)
262					ptx_pd->flags = 0;
263		}
264
265		skb_queue_tail(&pra_list->skb_head, skb_aggr);
266
267		pra_list->total_pkt_count++;
268
269		atomic_inc(&priv->wmm.tx_pkts_queued);
270
271		tx_info_aggr->flags |= MWIFIEX_BUF_FLAG_REQUEUED_PKT;
272		spin_unlock_bh(&priv->wmm.ra_list_spinlock);
273		mwifiex_dbg(adapter, ERROR, "data: -EBUSY is returned\n");
274		break;
275	case -1:
276		mwifiex_dbg(adapter, ERROR, "%s: host_to_card failed: %#x\n",
277			    __func__, ret);
278		adapter->dbg.num_tx_host_to_card_failure++;
279		mwifiex_write_data_complete(adapter, skb_aggr, 1, ret);
280		return 0;
281	case -EINPROGRESS:
282		break;
283	case 0:
284		mwifiex_write_data_complete(adapter, skb_aggr, 1, ret);
285		break;
286	default:
287		break;
288	}
289	if (ret != -EBUSY) {
290		mwifiex_rotate_priolists(priv, pra_list, ptrindex);
291	}
292
293	return 0;
294}