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
31static
32void wl18xx_get_last_tx_rate(struct wl1271 *wl, struct ieee80211_vif *vif,
33			     u8 band, struct ieee80211_tx_rate *rate)
34{
35	u8 fw_rate = wl->fw_status->counters.tx_last_rate;
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 == IEEE80211_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
76static 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
83	/* check for id legality */
84	if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
85		wl1271_warning("illegal id in tx completion: %d", id);
86		return;
87	}
88
89	/* a zero bit indicates Tx success */
90	tx_success = !(tx_stat_byte & BIT(WL18XX_TX_STATUS_STAT_BIT_IDX));
91
92	skb = wl->tx_frames[id];
93	info = IEEE80211_SKB_CB(skb);
94
95	if (wl12xx_is_dummy_packet(wl, skb)) {
96		wl1271_free_tx_id(wl, id);
97		return;
98	}
99
100	/* update the TX status info */
101	if (tx_success && !(info->flags & IEEE80211_TX_CTL_NO_ACK))
102		info->flags |= IEEE80211_TX_STAT_ACK;
103	/*
104	 * first pass info->control.vif while it's valid, and then fill out
105	 * the info->status structures
106	 */
107	wl18xx_get_last_tx_rate(wl, info->control.vif,
108				info->band, &info->status.rates[0]);
109
110	info->status.rates[0].count = 1; /* no data about retries */
111	info->status.ack_signal = -1;
112
113	if (!tx_success)
114		wl->stats.retry_count++;
115
116	/*
117	 * TODO: update sequence number for encryption? seems to be
118	 * unsupported for now. needed for recovery with encryption.
119	 */
120
121	/* remove private header from packet */
122	skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
123
124	/* remove TKIP header space if present */
125	if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
126	    info->control.hw_key &&
127	    info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
128		int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
129		memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data, hdrlen);
130		skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
131	}
132
133	wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p success %d",
134		     id, skb, tx_success);
135
136	/* return the packet to the stack */
137	skb_queue_tail(&wl->deferred_tx_queue, skb);
138	queue_work(wl->freezable_wq, &wl->netstack_work);
139	wl1271_free_tx_id(wl, id);
140}
141
142void wl18xx_tx_immediate_complete(struct wl1271 *wl)
143{
144	struct wl18xx_fw_status_priv *status_priv =
145		(struct wl18xx_fw_status_priv *)wl->fw_status->priv;
146	struct wl18xx_priv *priv = wl->priv;
147	u8 i;
148
149	/* nothing to do here */
150	if (priv->last_fw_rls_idx == status_priv->fw_release_idx)
151		return;
152
153	/* freed Tx descriptors */
154	wl1271_debug(DEBUG_TX, "last released desc = %d, current idx = %d",
155		     priv->last_fw_rls_idx, status_priv->fw_release_idx);
156
157	if (status_priv->fw_release_idx >= WL18XX_FW_MAX_TX_STATUS_DESC) {
158		wl1271_error("invalid desc release index %d",
159			     status_priv->fw_release_idx);
160		WARN_ON(1);
161		return;
162	}
163
164	for (i = priv->last_fw_rls_idx;
165	     i != status_priv->fw_release_idx;
166	     i = (i + 1) % WL18XX_FW_MAX_TX_STATUS_DESC) {
167		wl18xx_tx_complete_packet(wl,
168			status_priv->released_tx_desc[i]);
169
170		wl->tx_results_count++;
171	}
172
173	priv->last_fw_rls_idx = status_priv->fw_release_idx;
174}
175