1 /*
2 * This file is part of wl18xx
3 *
4 * Copyright (C) 2011 Texas Instruments Inc.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * version 2 as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
18 * 02110-1301 USA
19 *
20 */
21
22 #include "../wlcore/wlcore.h"
23 #include "../wlcore/cmd.h"
24 #include "../wlcore/debug.h"
25 #include "../wlcore/acx.h"
26 #include "../wlcore/tx.h"
27
28 #include "wl18xx.h"
29 #include "tx.h"
30
31 static
wl18xx_get_last_tx_rate(struct wl1271 * wl,struct ieee80211_vif * vif,u8 band,struct ieee80211_tx_rate * rate,u8 hlid)32 void wl18xx_get_last_tx_rate(struct wl1271 *wl, struct ieee80211_vif *vif,
33 u8 band, struct ieee80211_tx_rate *rate, u8 hlid)
34 {
35 u8 fw_rate = wl->links[hlid].fw_rate_idx;
36
37 if (fw_rate > CONF_HW_RATE_INDEX_MAX) {
38 wl1271_error("last Tx rate invalid: %d", fw_rate);
39 rate->idx = 0;
40 rate->flags = 0;
41 return;
42 }
43
44 if (fw_rate <= CONF_HW_RATE_INDEX_54MBPS) {
45 rate->idx = fw_rate;
46 if (band == NL80211_BAND_5GHZ)
47 rate->idx -= CONF_HW_RATE_INDEX_6MBPS;
48 rate->flags = 0;
49 } else {
50 rate->flags = IEEE80211_TX_RC_MCS;
51 rate->idx = fw_rate - CONF_HW_RATE_INDEX_MCS0;
52
53 /* SGI modifier is counted as a separate rate */
54 if (fw_rate >= CONF_HW_RATE_INDEX_MCS7_SGI)
55 (rate->idx)--;
56 if (fw_rate == CONF_HW_RATE_INDEX_MCS15_SGI)
57 (rate->idx)--;
58
59 /* this also covers the 40Mhz SGI case (= MCS15) */
60 if (fw_rate == CONF_HW_RATE_INDEX_MCS7_SGI ||
61 fw_rate == CONF_HW_RATE_INDEX_MCS15_SGI)
62 rate->flags |= IEEE80211_TX_RC_SHORT_GI;
63
64 if (fw_rate > CONF_HW_RATE_INDEX_MCS7_SGI && vif) {
65 struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
66 if (wlvif->channel_type == NL80211_CHAN_HT40MINUS ||
67 wlvif->channel_type == NL80211_CHAN_HT40PLUS) {
68 /* adjustment needed for range 0-7 */
69 rate->idx -= 8;
70 rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
71 }
72 }
73 }
74 }
75
wl18xx_tx_complete_packet(struct wl1271 * wl,u8 tx_stat_byte)76 static void wl18xx_tx_complete_packet(struct wl1271 *wl, u8 tx_stat_byte)
77 {
78 struct ieee80211_tx_info *info;
79 struct sk_buff *skb;
80 int id = tx_stat_byte & WL18XX_TX_STATUS_DESC_ID_MASK;
81 bool tx_success;
82 struct wl1271_tx_hw_descr *tx_desc;
83
84 /* check for id legality */
85 if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
86 wl1271_warning("illegal id in tx completion: %d", id);
87 return;
88 }
89
90 /* a zero bit indicates Tx success */
91 tx_success = !(tx_stat_byte & BIT(WL18XX_TX_STATUS_STAT_BIT_IDX));
92
93 skb = wl->tx_frames[id];
94 info = IEEE80211_SKB_CB(skb);
95 tx_desc = (struct wl1271_tx_hw_descr *)skb->data;
96
97 if (wl12xx_is_dummy_packet(wl, skb)) {
98 wl1271_free_tx_id(wl, id);
99 return;
100 }
101
102 /* update the TX status info */
103 if (tx_success && !(info->flags & IEEE80211_TX_CTL_NO_ACK))
104 info->flags |= IEEE80211_TX_STAT_ACK;
105 /*
106 * first pass info->control.vif while it's valid, and then fill out
107 * the info->status structures
108 */
109 wl18xx_get_last_tx_rate(wl, info->control.vif,
110 info->band,
111 &info->status.rates[0],
112 tx_desc->hlid);
113
114 info->status.rates[0].count = 1; /* no data about retries */
115 info->status.ack_signal = -1;
116
117 if (!tx_success)
118 wl->stats.retry_count++;
119
120 /*
121 * TODO: update sequence number for encryption? seems to be
122 * unsupported for now. needed for recovery with encryption.
123 */
124
125 /* remove private header from packet */
126 skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
127
128 /* remove TKIP header space if present */
129 if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
130 info->control.hw_key &&
131 info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
132 int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
133 memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data, hdrlen);
134 skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
135 }
136
137 wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p success %d",
138 id, skb, tx_success);
139
140 /* return the packet to the stack */
141 skb_queue_tail(&wl->deferred_tx_queue, skb);
142 queue_work(wl->freezable_wq, &wl->netstack_work);
143 wl1271_free_tx_id(wl, id);
144 }
145
wl18xx_tx_immediate_complete(struct wl1271 * wl)146 void wl18xx_tx_immediate_complete(struct wl1271 *wl)
147 {
148 struct wl18xx_fw_status_priv *status_priv =
149 (struct wl18xx_fw_status_priv *)wl->fw_status->priv;
150 struct wl18xx_priv *priv = wl->priv;
151 u8 i, hlid;
152
153 /* nothing to do here */
154 if (priv->last_fw_rls_idx == status_priv->fw_release_idx)
155 return;
156
157 /* update rates per link */
158 hlid = wl->fw_status->counters.hlid;
159
160 if (hlid < WLCORE_MAX_LINKS) {
161 wl->links[hlid].fw_rate_idx =
162 wl->fw_status->counters.tx_last_rate;
163 wl->links[hlid].fw_rate_mbps =
164 wl->fw_status->counters.tx_last_rate_mbps;
165 }
166
167 /* freed Tx descriptors */
168 wl1271_debug(DEBUG_TX, "last released desc = %d, current idx = %d",
169 priv->last_fw_rls_idx, status_priv->fw_release_idx);
170
171 if (status_priv->fw_release_idx >= WL18XX_FW_MAX_TX_STATUS_DESC) {
172 wl1271_error("invalid desc release index %d",
173 status_priv->fw_release_idx);
174 WARN_ON(1);
175 return;
176 }
177
178 for (i = priv->last_fw_rls_idx;
179 i != status_priv->fw_release_idx;
180 i = (i + 1) % WL18XX_FW_MAX_TX_STATUS_DESC) {
181 wl18xx_tx_complete_packet(wl,
182 status_priv->released_tx_desc[i]);
183
184 wl->tx_results_count++;
185 }
186
187 priv->last_fw_rls_idx = status_priv->fw_release_idx;
188 }
189