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1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * This file is part of wl18xx
4  *
5  * Copyright (C) 2011 Texas Instruments Inc.
6  */
7 
8 #include "../wlcore/wlcore.h"
9 #include "../wlcore/cmd.h"
10 #include "../wlcore/debug.h"
11 #include "../wlcore/acx.h"
12 #include "../wlcore/tx.h"
13 
14 #include "wl18xx.h"
15 #include "tx.h"
16 
17 static
wl18xx_get_last_tx_rate(struct wl1271 * wl,struct ieee80211_vif * vif,u8 band,struct ieee80211_tx_rate * rate,u8 hlid)18 void wl18xx_get_last_tx_rate(struct wl1271 *wl, struct ieee80211_vif *vif,
19 			     u8 band, struct ieee80211_tx_rate *rate, u8 hlid)
20 {
21 	u8 fw_rate = wl->links[hlid].fw_rate_idx;
22 
23 	if (fw_rate > CONF_HW_RATE_INDEX_MAX) {
24 		wl1271_error("last Tx rate invalid: %d", fw_rate);
25 		rate->idx = 0;
26 		rate->flags = 0;
27 		return;
28 	}
29 
30 	if (fw_rate <= CONF_HW_RATE_INDEX_54MBPS) {
31 		rate->idx = fw_rate;
32 		if (band == NL80211_BAND_5GHZ)
33 			rate->idx -= CONF_HW_RATE_INDEX_6MBPS;
34 		rate->flags = 0;
35 	} else {
36 		rate->flags = IEEE80211_TX_RC_MCS;
37 		rate->idx = fw_rate - CONF_HW_RATE_INDEX_MCS0;
38 
39 		/* SGI modifier is counted as a separate rate */
40 		if (fw_rate >= CONF_HW_RATE_INDEX_MCS7_SGI)
41 			(rate->idx)--;
42 		if (fw_rate == CONF_HW_RATE_INDEX_MCS15_SGI)
43 			(rate->idx)--;
44 
45 		/* this also covers the 40Mhz SGI case (= MCS15) */
46 		if (fw_rate == CONF_HW_RATE_INDEX_MCS7_SGI ||
47 		    fw_rate == CONF_HW_RATE_INDEX_MCS15_SGI)
48 			rate->flags |= IEEE80211_TX_RC_SHORT_GI;
49 
50 		if (fw_rate > CONF_HW_RATE_INDEX_MCS7_SGI && vif) {
51 			struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
52 			if (wlvif->channel_type == NL80211_CHAN_HT40MINUS ||
53 			    wlvif->channel_type == NL80211_CHAN_HT40PLUS) {
54 				/* adjustment needed for range 0-7 */
55 				rate->idx -= 8;
56 				rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
57 			}
58 		}
59 	}
60 }
61 
wl18xx_tx_complete_packet(struct wl1271 * wl,u8 tx_stat_byte)62 static void wl18xx_tx_complete_packet(struct wl1271 *wl, u8 tx_stat_byte)
63 {
64 	struct ieee80211_tx_info *info;
65 	struct sk_buff *skb;
66 	int id = tx_stat_byte & WL18XX_TX_STATUS_DESC_ID_MASK;
67 	bool tx_success;
68 	struct wl1271_tx_hw_descr *tx_desc;
69 
70 	/* check for id legality */
71 	if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
72 		wl1271_warning("illegal id in tx completion: %d", id);
73 		return;
74 	}
75 
76 	/* a zero bit indicates Tx success */
77 	tx_success = !(tx_stat_byte & BIT(WL18XX_TX_STATUS_STAT_BIT_IDX));
78 
79 	skb = wl->tx_frames[id];
80 	info = IEEE80211_SKB_CB(skb);
81 	tx_desc = (struct wl1271_tx_hw_descr *)skb->data;
82 
83 	if (wl12xx_is_dummy_packet(wl, skb)) {
84 		wl1271_free_tx_id(wl, id);
85 		return;
86 	}
87 
88 	/* update the TX status info */
89 	if (tx_success && !(info->flags & IEEE80211_TX_CTL_NO_ACK))
90 		info->flags |= IEEE80211_TX_STAT_ACK;
91 	/*
92 	 * first pass info->control.vif while it's valid, and then fill out
93 	 * the info->status structures
94 	 */
95 	wl18xx_get_last_tx_rate(wl, info->control.vif,
96 				info->band,
97 				&info->status.rates[0],
98 				tx_desc->hlid);
99 
100 	info->status.rates[0].count = 1; /* no data about retries */
101 	info->status.ack_signal = -1;
102 
103 	if (!tx_success)
104 		wl->stats.retry_count++;
105 
106 	/*
107 	 * TODO: update sequence number for encryption? seems to be
108 	 * unsupported for now. needed for recovery with encryption.
109 	 */
110 
111 	/* remove private header from packet */
112 	skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
113 
114 	/* remove TKIP header space if present */
115 	if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
116 	    info->control.hw_key &&
117 	    info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
118 		int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
119 		memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data, hdrlen);
120 		skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
121 	}
122 
123 	wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p success %d",
124 		     id, skb, tx_success);
125 
126 	/* return the packet to the stack */
127 	skb_queue_tail(&wl->deferred_tx_queue, skb);
128 	queue_work(wl->freezable_wq, &wl->netstack_work);
129 	wl1271_free_tx_id(wl, id);
130 }
131 
wl18xx_tx_immediate_complete(struct wl1271 * wl)132 void wl18xx_tx_immediate_complete(struct wl1271 *wl)
133 {
134 	struct wl18xx_fw_status_priv *status_priv =
135 		(struct wl18xx_fw_status_priv *)wl->fw_status->priv;
136 	struct wl18xx_priv *priv = wl->priv;
137 	u8 i, hlid;
138 
139 	/* nothing to do here */
140 	if (priv->last_fw_rls_idx == status_priv->fw_release_idx)
141 		return;
142 
143 	/* update rates per link */
144 	hlid = wl->fw_status->counters.hlid;
145 
146 	if (hlid < WLCORE_MAX_LINKS) {
147 		wl->links[hlid].fw_rate_idx =
148 				wl->fw_status->counters.tx_last_rate;
149 		wl->links[hlid].fw_rate_mbps =
150 				wl->fw_status->counters.tx_last_rate_mbps;
151 	}
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