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			     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		rate->flags = 0;
 47	} else {
 48		rate->flags = IEEE80211_TX_RC_MCS;
 49		rate->idx = fw_rate - CONF_HW_RATE_INDEX_MCS0;
 50
 51		/* SGI modifier is counted as a separate rate */
 52		if (fw_rate >= CONF_HW_RATE_INDEX_MCS7_SGI)
 53			(rate->idx)--;
 54		if (fw_rate == CONF_HW_RATE_INDEX_MCS15_SGI)
 55			(rate->idx)--;
 56
 57		/* this also covers the 40Mhz SGI case (= MCS15) */
 58		if (fw_rate == CONF_HW_RATE_INDEX_MCS7_SGI ||
 59		    fw_rate == CONF_HW_RATE_INDEX_MCS15_SGI)
 60			rate->flags |= IEEE80211_TX_RC_SHORT_GI;
 61
 62		if (fw_rate > CONF_HW_RATE_INDEX_MCS7_SGI && vif) {
 63			struct wl12xx_vif *wlvif = wl12xx_vif_to_data(vif);
 64			if (wlvif->channel_type == NL80211_CHAN_HT40MINUS ||
 65			    wlvif->channel_type == NL80211_CHAN_HT40PLUS) {
 66				/* adjustment needed for range 0-7 */
 67				rate->idx -= 8;
 68				rate->flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
 69			}
 70		}
 71	}
 72}
 73
 74static void wl18xx_tx_complete_packet(struct wl1271 *wl, u8 tx_stat_byte)
 75{
 76	struct ieee80211_tx_info *info;
 77	struct sk_buff *skb;
 78	int id = tx_stat_byte & WL18XX_TX_STATUS_DESC_ID_MASK;
 79	bool tx_success;
 80
 81	/* check for id legality */
 82	if (unlikely(id >= wl->num_tx_desc || wl->tx_frames[id] == NULL)) {
 83		wl1271_warning("illegal id in tx completion: %d", id);
 84		return;
 85	}
 86
 87	/* a zero bit indicates Tx success */
 88	tx_success = !(tx_stat_byte & BIT(WL18XX_TX_STATUS_STAT_BIT_IDX));
 89
 90	skb = wl->tx_frames[id];
 91	info = IEEE80211_SKB_CB(skb);
 92
 93	if (wl12xx_is_dummy_packet(wl, skb)) {
 94		wl1271_free_tx_id(wl, id);
 95		return;
 96	}
 97
 98	/* update the TX status info */
 99	if (tx_success && !(info->flags & IEEE80211_TX_CTL_NO_ACK))
100		info->flags |= IEEE80211_TX_STAT_ACK;
101	/*
102	 * first pass info->control.vif while it's valid, and then fill out
103	 * the info->status structures
104	 */
105	wl18xx_get_last_tx_rate(wl, info->control.vif, &info->status.rates[0]);
106
107	info->status.rates[0].count = 1; /* no data about retries */
108	info->status.ack_signal = -1;
109
110	if (!tx_success)
111		wl->stats.retry_count++;
112
113	/*
114	 * TODO: update sequence number for encryption? seems to be
115	 * unsupported for now. needed for recovery with encryption.
116	 */
117
118	/* remove private header from packet */
119	skb_pull(skb, sizeof(struct wl1271_tx_hw_descr));
120
121	/* remove TKIP header space if present */
122	if ((wl->quirks & WLCORE_QUIRK_TKIP_HEADER_SPACE) &&
123	    info->control.hw_key &&
124	    info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
125		int hdrlen = ieee80211_get_hdrlen_from_skb(skb);
126		memmove(skb->data + WL1271_EXTRA_SPACE_TKIP, skb->data, hdrlen);
127		skb_pull(skb, WL1271_EXTRA_SPACE_TKIP);
128	}
129
130	wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p success %d",
131		     id, skb, tx_success);
132
133	/* return the packet to the stack */
134	skb_queue_tail(&wl->deferred_tx_queue, skb);
135	queue_work(wl->freezable_wq, &wl->netstack_work);
136	wl1271_free_tx_id(wl, id);
137}
138
139void wl18xx_tx_immediate_complete(struct wl1271 *wl)
140{
141	struct wl18xx_fw_status_priv *status_priv =
142		(struct wl18xx_fw_status_priv *)wl->fw_status->priv;
143	struct wl18xx_priv *priv = wl->priv;
144	u8 i;
145
146	/* nothing to do here */
147	if (priv->last_fw_rls_idx == status_priv->fw_release_idx)
148		return;
149
150	/* freed Tx descriptors */
151	wl1271_debug(DEBUG_TX, "last released desc = %d, current idx = %d",
152		     priv->last_fw_rls_idx, status_priv->fw_release_idx);
153
154	if (status_priv->fw_release_idx >= WL18XX_FW_MAX_TX_STATUS_DESC) {
155		wl1271_error("invalid desc release index %d",
156			     status_priv->fw_release_idx);
157		WARN_ON(1);
158		return;
159	}
160
161	for (i = priv->last_fw_rls_idx;
162	     i != status_priv->fw_release_idx;
163	     i = (i + 1) % WL18XX_FW_MAX_TX_STATUS_DESC) {
164		wl18xx_tx_complete_packet(wl,
165			status_priv->released_tx_desc[i]);
166
167		wl->tx_results_count++;
168	}
169
170	priv->last_fw_rls_idx = status_priv->fw_release_idx;
171}