2 * Marvell Wireless LAN device driver: 802.11n Aggregation
4 * Copyright (C) 2011, Marvell International Ltd.
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.
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.
30 * Creates an AMSDU subframe for aggregation into one AMSDU packet.
32 * The resultant AMSDU subframe format is -
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-->
40 * This function also computes the amount of padding required to make the
41 * buffer length multiple of 4 bytes.
43 * Data => |DA|SA|SNAP-TYPE|........ .|
44 * MSDU => |DA|SA|Length|SNAP|...... ..|
47 mwifiex_11n_form_amsdu_pkt(struct sk_buff
*skb_aggr
,
48 struct sk_buff
*skb_src
, int *pad
)
52 struct rfc_1042_hdr snap
= {
56 {0x00, 0x00, 0x00}, /* SNAP OUI */
57 0x0000 /* SNAP type */
59 * This field will be overwritten
60 * later with ethertype
63 struct tx_packet_hdr
*tx_header
;
65 tx_header
= (void *)skb_put(skb_aggr
, sizeof(*tx_header
));
68 dt_offset
= 2 * ETH_ALEN
;
69 memcpy(&tx_header
->eth803_hdr
, skb_src
->data
, dt_offset
);
71 /* Copy SNAP header */
72 snap
.snap_type
= ((struct ethhdr
*)skb_src
->data
)->h_proto
;
74 dt_offset
+= sizeof(__be16
);
76 memcpy(&tx_header
->rfc1042_hdr
, &snap
, sizeof(struct rfc_1042_hdr
));
78 skb_pull(skb_src
, dt_offset
);
80 /* Update Length field */
81 tx_header
->eth803_hdr
.h_proto
= htons(skb_src
->len
+ LLC_SNAP_LEN
);
84 memcpy(skb_put(skb_aggr
, skb_src
->len
), skb_src
->data
, skb_src
->len
);
86 /* Add padding for new MSDU to start from 4 byte boundary */
87 *pad
= (4 - ((unsigned long)skb_aggr
->tail
& 0x3)) % 4;
89 return skb_aggr
->len
+ *pad
;
93 * Adds TxPD to AMSDU header.
95 * Each AMSDU packet will contain one TxPD at the beginning,
96 * followed by multiple AMSDU subframes.
99 mwifiex_11n_form_amsdu_txpd(struct mwifiex_private
*priv
,
102 struct txpd
*local_tx_pd
;
103 struct mwifiex_txinfo
*tx_info
= MWIFIEX_SKB_TXCB(skb
);
105 skb_push(skb
, sizeof(*local_tx_pd
));
107 local_tx_pd
= (struct txpd
*) skb
->data
;
108 memset(local_tx_pd
, 0, sizeof(struct txpd
));
110 /* Original priority has been overwritten */
111 local_tx_pd
->priority
= (u8
) skb
->priority
;
112 local_tx_pd
->pkt_delay_2ms
=
113 mwifiex_wmm_compute_drv_pkt_delay(priv
, skb
);
114 local_tx_pd
->bss_num
= priv
->bss_num
;
115 local_tx_pd
->bss_type
= priv
->bss_type
;
116 /* Always zero as the data is followed by struct txpd */
117 local_tx_pd
->tx_pkt_offset
= cpu_to_le16(sizeof(struct txpd
));
118 local_tx_pd
->tx_pkt_type
= cpu_to_le16(PKT_TYPE_AMSDU
);
119 local_tx_pd
->tx_pkt_length
= cpu_to_le16(skb
->len
-
120 sizeof(*local_tx_pd
));
122 if (tx_info
->flags
& MWIFIEX_BUF_FLAG_TDLS_PKT
)
123 local_tx_pd
->flags
|= MWIFIEX_TXPD_FLAGS_TDLS_PACKET
;
125 if (local_tx_pd
->tx_control
== 0)
126 /* TxCtrl set by user or default */
127 local_tx_pd
->tx_control
= cpu_to_le32(priv
->pkt_tx_ctrl
);
129 if (GET_BSS_ROLE(priv
) == MWIFIEX_BSS_ROLE_STA
&&
130 priv
->adapter
->pps_uapsd_mode
) {
131 if (true == mwifiex_check_last_packet_indication(priv
)) {
132 priv
->adapter
->tx_lock_flag
= true;
134 MWIFIEX_TxPD_POWER_MGMT_LAST_PACKET
;
140 * Create aggregated packet.
142 * This function creates an aggregated MSDU packet, by combining buffers
143 * from the RA list. Each individual buffer is encapsulated as an AMSDU
144 * subframe and all such subframes are concatenated together to form the
147 * A TxPD is also added to the front of the resultant AMSDU packets for
148 * transmission. The resultant packets format is -
150 * +---- ~ ----+------ ~ ------+------ ~ ------+-..-+------ ~ ------+
151 * | TxPD |AMSDU sub-frame|AMSDU sub-frame| .. |AMSDU sub-frame|
152 * | | 1 | 2 | .. | n |
153 * +---- ~ ----+------ ~ ------+------ ~ ------+ .. +------ ~ ------+
156 mwifiex_11n_aggregate_pkt(struct mwifiex_private
*priv
,
157 struct mwifiex_ra_list_tbl
*pra_list
,
158 int ptrindex
, unsigned long ra_list_flags
)
159 __releases(&priv
->wmm
.ra_list_spinlock
)
161 struct mwifiex_adapter
*adapter
= priv
->adapter
;
162 struct sk_buff
*skb_aggr
, *skb_src
;
163 struct mwifiex_txinfo
*tx_info_aggr
, *tx_info_src
;
165 struct mwifiex_tx_param tx_param
;
166 struct txpd
*ptx_pd
= NULL
;
168 int headroom
= adapter
->iface_type
== MWIFIEX_USB
? 0 : INTF_HEADER_LEN
;
170 skb_src
= skb_peek(&pra_list
->skb_head
);
172 spin_unlock_irqrestore(&priv
->wmm
.ra_list_spinlock
,
177 tx_info_src
= MWIFIEX_SKB_TXCB(skb_src
);
178 skb_aggr
= dev_alloc_skb(adapter
->tx_buf_size
);
180 dev_err(adapter
->dev
, "%s: alloc skb_aggr\n", __func__
);
181 spin_unlock_irqrestore(&priv
->wmm
.ra_list_spinlock
,
185 skb_reserve(skb_aggr
, headroom
+ sizeof(struct txpd
));
186 tx_info_aggr
= MWIFIEX_SKB_TXCB(skb_aggr
);
188 memset(tx_info_aggr
, 0, sizeof(*tx_info_aggr
));
189 tx_info_aggr
->bss_type
= tx_info_src
->bss_type
;
190 tx_info_aggr
->bss_num
= tx_info_src
->bss_num
;
192 if (tx_info_src
->flags
& MWIFIEX_BUF_FLAG_TDLS_PKT
)
193 tx_info_aggr
->flags
|= MWIFIEX_BUF_FLAG_TDLS_PKT
;
194 skb_aggr
->priority
= skb_src
->priority
;
196 do_gettimeofday(&tv
);
197 skb_aggr
->tstamp
= timeval_to_ktime(tv
);
200 /* Check if AMSDU can accommodate this MSDU */
201 if (skb_tailroom(skb_aggr
) < (skb_src
->len
+ LLC_SNAP_LEN
))
204 skb_src
= skb_dequeue(&pra_list
->skb_head
);
206 pra_list
->total_pkt_count
--;
208 atomic_dec(&priv
->wmm
.tx_pkts_queued
);
210 spin_unlock_irqrestore(&priv
->wmm
.ra_list_spinlock
,
212 mwifiex_11n_form_amsdu_pkt(skb_aggr
, skb_src
, &pad
);
214 mwifiex_write_data_complete(adapter
, skb_src
, 0, 0);
216 spin_lock_irqsave(&priv
->wmm
.ra_list_spinlock
, ra_list_flags
);
218 if (!mwifiex_is_ralist_valid(priv
, pra_list
, ptrindex
)) {
219 spin_unlock_irqrestore(&priv
->wmm
.ra_list_spinlock
,
224 if (skb_tailroom(skb_aggr
) < pad
) {
228 skb_put(skb_aggr
, pad
);
230 skb_src
= skb_peek(&pra_list
->skb_head
);
234 spin_unlock_irqrestore(&priv
->wmm
.ra_list_spinlock
, ra_list_flags
);
236 /* Last AMSDU packet does not need padding */
237 skb_trim(skb_aggr
, skb_aggr
->len
- pad
);
240 mwifiex_11n_form_amsdu_txpd(priv
, skb_aggr
);
241 if (GET_BSS_ROLE(priv
) == MWIFIEX_BSS_ROLE_STA
)
242 ptx_pd
= (struct txpd
*)skb_aggr
->data
;
244 skb_push(skb_aggr
, headroom
);
246 if (adapter
->iface_type
== MWIFIEX_USB
) {
247 adapter
->data_sent
= true;
248 ret
= adapter
->if_ops
.host_to_card(adapter
, MWIFIEX_USB_EP_DATA
,
252 tx_param
.next_pkt_len
=
253 skb_src
->len
+ sizeof(struct txpd
);
255 tx_param
.next_pkt_len
= 0;
257 ret
= adapter
->if_ops
.host_to_card(adapter
, MWIFIEX_TYPE_DATA
,
258 skb_aggr
, &tx_param
);
262 spin_lock_irqsave(&priv
->wmm
.ra_list_spinlock
, ra_list_flags
);
263 if (!mwifiex_is_ralist_valid(priv
, pra_list
, ptrindex
)) {
264 spin_unlock_irqrestore(&priv
->wmm
.ra_list_spinlock
,
266 mwifiex_write_data_complete(adapter
, skb_aggr
, 1, -1);
269 if (GET_BSS_ROLE(priv
) == MWIFIEX_BSS_ROLE_STA
&&
270 adapter
->pps_uapsd_mode
&& adapter
->tx_lock_flag
) {
271 priv
->adapter
->tx_lock_flag
= false;
276 skb_queue_tail(&pra_list
->skb_head
, skb_aggr
);
278 pra_list
->total_pkt_count
++;
280 atomic_inc(&priv
->wmm
.tx_pkts_queued
);
282 tx_info_aggr
->flags
|= MWIFIEX_BUF_FLAG_REQUEUED_PKT
;
283 spin_unlock_irqrestore(&priv
->wmm
.ra_list_spinlock
,
285 dev_dbg(adapter
->dev
, "data: -EBUSY is returned\n");
288 if (adapter
->iface_type
!= MWIFIEX_PCIE
)
289 adapter
->data_sent
= false;
290 dev_err(adapter
->dev
, "%s: host_to_card failed: %#x\n",
292 adapter
->dbg
.num_tx_host_to_card_failure
++;
293 mwifiex_write_data_complete(adapter
, skb_aggr
, 1, ret
);
296 if (adapter
->iface_type
!= MWIFIEX_PCIE
)
297 adapter
->data_sent
= false;
300 mwifiex_write_data_complete(adapter
, skb_aggr
, 1, ret
);
306 mwifiex_rotate_priolists(priv
, pra_list
, ptrindex
);