570 lines
17 KiB
C
570 lines
17 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Data transmitting implementation.
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*
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* Copyright (c) 2017-2020, Silicon Laboratories, Inc.
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* Copyright (c) 2010, ST-Ericsson
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*/
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#include <net/mac80211.h>
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#include <linux/etherdevice.h>
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#include "data_tx.h"
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#include "wfx.h"
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#include "bh.h"
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#include "sta.h"
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#include "queue.h"
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#include "debug.h"
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#include "traces.h"
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#include "hif_tx_mib.h"
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static int wfx_get_hw_rate(struct wfx_dev *wdev, const struct ieee80211_tx_rate *rate)
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{
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struct ieee80211_supported_band *band;
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if (rate->idx < 0)
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return -1;
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if (rate->flags & IEEE80211_TX_RC_MCS) {
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if (rate->idx > 7) {
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WARN(1, "wrong rate->idx value: %d", rate->idx);
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return -1;
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}
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return rate->idx + 14;
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}
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/* The device only support 2GHz, else band information should be retrieved from
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* ieee80211_tx_info
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*/
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band = wdev->hw->wiphy->bands[NL80211_BAND_2GHZ];
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if (rate->idx >= band->n_bitrates) {
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WARN(1, "wrong rate->idx value: %d", rate->idx);
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return -1;
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}
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return band->bitrates[rate->idx].hw_value;
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}
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/* TX policy cache implementation */
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static void wfx_tx_policy_build(struct wfx_vif *wvif, struct wfx_tx_policy *policy,
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struct ieee80211_tx_rate *rates)
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{
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struct wfx_dev *wdev = wvif->wdev;
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int i, rateid;
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u8 count;
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WARN(rates[0].idx < 0, "invalid rate policy");
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memset(policy, 0, sizeof(*policy));
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for (i = 0; i < IEEE80211_TX_MAX_RATES; ++i) {
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if (rates[i].idx < 0)
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break;
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WARN_ON(rates[i].count > 15);
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rateid = wfx_get_hw_rate(wdev, &rates[i]);
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/* Pack two values in each byte of policy->rates */
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count = rates[i].count;
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if (rateid % 2)
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count <<= 4;
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policy->rates[rateid / 2] |= count;
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}
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}
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static bool wfx_tx_policy_is_equal(const struct wfx_tx_policy *a, const struct wfx_tx_policy *b)
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{
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return !memcmp(a->rates, b->rates, sizeof(a->rates));
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}
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static int wfx_tx_policy_find(struct wfx_tx_policy_cache *cache, struct wfx_tx_policy *wanted)
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{
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struct wfx_tx_policy *it;
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list_for_each_entry(it, &cache->used, link)
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if (wfx_tx_policy_is_equal(wanted, it))
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return it - cache->cache;
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list_for_each_entry(it, &cache->free, link)
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if (wfx_tx_policy_is_equal(wanted, it))
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return it - cache->cache;
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return -1;
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}
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static void wfx_tx_policy_use(struct wfx_tx_policy_cache *cache, struct wfx_tx_policy *entry)
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{
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++entry->usage_count;
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list_move(&entry->link, &cache->used);
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}
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static int wfx_tx_policy_release(struct wfx_tx_policy_cache *cache, struct wfx_tx_policy *entry)
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{
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int ret = --entry->usage_count;
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if (!ret)
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list_move(&entry->link, &cache->free);
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return ret;
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}
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static int wfx_tx_policy_get(struct wfx_vif *wvif, struct ieee80211_tx_rate *rates, bool *renew)
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{
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int idx;
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struct wfx_tx_policy_cache *cache = &wvif->tx_policy_cache;
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struct wfx_tx_policy wanted;
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struct wfx_tx_policy *entry;
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wfx_tx_policy_build(wvif, &wanted, rates);
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spin_lock_bh(&cache->lock);
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if (list_empty(&cache->free)) {
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WARN(1, "unable to get a valid Tx policy");
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spin_unlock_bh(&cache->lock);
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return HIF_TX_RETRY_POLICY_INVALID;
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}
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idx = wfx_tx_policy_find(cache, &wanted);
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if (idx >= 0) {
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*renew = false;
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} else {
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/* If policy is not found create a new one using the oldest entry in "free" list */
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*renew = true;
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entry = list_entry(cache->free.prev, struct wfx_tx_policy, link);
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memcpy(entry->rates, wanted.rates, sizeof(entry->rates));
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entry->uploaded = false;
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entry->usage_count = 0;
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idx = entry - cache->cache;
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}
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wfx_tx_policy_use(cache, &cache->cache[idx]);
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if (list_empty(&cache->free))
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ieee80211_stop_queues(wvif->wdev->hw);
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spin_unlock_bh(&cache->lock);
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return idx;
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}
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static void wfx_tx_policy_put(struct wfx_vif *wvif, int idx)
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{
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int usage, locked;
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struct wfx_tx_policy_cache *cache = &wvif->tx_policy_cache;
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if (idx == HIF_TX_RETRY_POLICY_INVALID)
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return;
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spin_lock_bh(&cache->lock);
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locked = list_empty(&cache->free);
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usage = wfx_tx_policy_release(cache, &cache->cache[idx]);
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if (locked && !usage)
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ieee80211_wake_queues(wvif->wdev->hw);
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spin_unlock_bh(&cache->lock);
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}
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static int wfx_tx_policy_upload(struct wfx_vif *wvif)
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{
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struct wfx_tx_policy *policies = wvif->tx_policy_cache.cache;
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u8 tmp_rates[12];
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int i, is_used;
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do {
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spin_lock_bh(&wvif->tx_policy_cache.lock);
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for (i = 0; i < ARRAY_SIZE(wvif->tx_policy_cache.cache); ++i) {
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is_used = memzcmp(policies[i].rates, sizeof(policies[i].rates));
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if (!policies[i].uploaded && is_used)
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break;
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}
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if (i < ARRAY_SIZE(wvif->tx_policy_cache.cache)) {
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policies[i].uploaded = true;
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memcpy(tmp_rates, policies[i].rates, sizeof(tmp_rates));
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spin_unlock_bh(&wvif->tx_policy_cache.lock);
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wfx_hif_set_tx_rate_retry_policy(wvif, i, tmp_rates);
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} else {
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spin_unlock_bh(&wvif->tx_policy_cache.lock);
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}
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} while (i < ARRAY_SIZE(wvif->tx_policy_cache.cache));
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return 0;
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}
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void wfx_tx_policy_upload_work(struct work_struct *work)
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{
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struct wfx_vif *wvif = container_of(work, struct wfx_vif, tx_policy_upload_work);
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wfx_tx_policy_upload(wvif);
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wfx_tx_unlock(wvif->wdev);
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}
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void wfx_tx_policy_init(struct wfx_vif *wvif)
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{
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struct wfx_tx_policy_cache *cache = &wvif->tx_policy_cache;
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int i;
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memset(cache, 0, sizeof(*cache));
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spin_lock_init(&cache->lock);
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INIT_LIST_HEAD(&cache->used);
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INIT_LIST_HEAD(&cache->free);
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for (i = 0; i < ARRAY_SIZE(cache->cache); ++i)
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list_add(&cache->cache[i].link, &cache->free);
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}
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/* Tx implementation */
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static bool wfx_is_action_back(struct ieee80211_hdr *hdr)
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{
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struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)hdr;
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if (!ieee80211_is_action(mgmt->frame_control))
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return false;
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if (mgmt->u.action.category != WLAN_CATEGORY_BACK)
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return false;
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return true;
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}
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static u8 wfx_tx_get_link_id(struct wfx_vif *wvif, struct ieee80211_sta *sta,
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struct ieee80211_hdr *hdr)
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{
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struct wfx_sta_priv *sta_priv = sta ? (struct wfx_sta_priv *)&sta->drv_priv : NULL;
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struct ieee80211_vif *vif = wvif_to_vif(wvif);
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const u8 *da = ieee80211_get_DA(hdr);
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if (sta_priv && sta_priv->link_id)
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return sta_priv->link_id;
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if (vif->type != NL80211_IFTYPE_AP)
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return 0;
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if (is_multicast_ether_addr(da))
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return 0;
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return HIF_LINK_ID_NOT_ASSOCIATED;
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}
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static void wfx_tx_fixup_rates(struct ieee80211_tx_rate *rates)
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{
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int i;
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bool finished;
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/* Firmware is not able to mix rates with different flags */
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for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
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if (rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
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rates[i].flags |= IEEE80211_TX_RC_SHORT_GI;
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if (!(rates[0].flags & IEEE80211_TX_RC_SHORT_GI))
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rates[i].flags &= ~IEEE80211_TX_RC_SHORT_GI;
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if (!(rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS))
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rates[i].flags &= ~IEEE80211_TX_RC_USE_RTS_CTS;
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}
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/* Sort rates and remove duplicates */
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do {
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finished = true;
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for (i = 0; i < IEEE80211_TX_MAX_RATES - 1; i++) {
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if (rates[i + 1].idx == rates[i].idx &&
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rates[i].idx != -1) {
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rates[i].count += rates[i + 1].count;
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if (rates[i].count > 15)
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rates[i].count = 15;
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rates[i + 1].idx = -1;
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rates[i + 1].count = 0;
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finished = false;
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}
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if (rates[i + 1].idx > rates[i].idx) {
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swap(rates[i + 1], rates[i]);
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finished = false;
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}
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}
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} while (!finished);
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/* Ensure that MCS0 or 1Mbps is present at the end of the retry list */
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for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
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if (rates[i].idx == 0)
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break;
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if (rates[i].idx == -1) {
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rates[i].idx = 0;
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rates[i].count = 8; /* == hw->max_rate_tries */
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rates[i].flags = rates[i - 1].flags & IEEE80211_TX_RC_MCS;
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break;
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}
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}
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/* All retries use long GI */
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for (i = 1; i < IEEE80211_TX_MAX_RATES; i++)
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rates[i].flags &= ~IEEE80211_TX_RC_SHORT_GI;
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}
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static u8 wfx_tx_get_retry_policy_id(struct wfx_vif *wvif, struct ieee80211_tx_info *tx_info)
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{
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bool tx_policy_renew = false;
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u8 ret;
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ret = wfx_tx_policy_get(wvif, tx_info->driver_rates, &tx_policy_renew);
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if (ret == HIF_TX_RETRY_POLICY_INVALID)
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dev_warn(wvif->wdev->dev, "unable to get a valid Tx policy");
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if (tx_policy_renew) {
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wfx_tx_lock(wvif->wdev);
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if (!schedule_work(&wvif->tx_policy_upload_work))
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wfx_tx_unlock(wvif->wdev);
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}
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return ret;
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}
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static int wfx_tx_get_frame_format(struct ieee80211_tx_info *tx_info)
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{
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if (!(tx_info->driver_rates[0].flags & IEEE80211_TX_RC_MCS))
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return HIF_FRAME_FORMAT_NON_HT;
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else if (!(tx_info->driver_rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD))
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return HIF_FRAME_FORMAT_MIXED_FORMAT_HT;
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else
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return HIF_FRAME_FORMAT_GF_HT_11N;
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}
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static int wfx_tx_get_icv_len(struct ieee80211_key_conf *hw_key)
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{
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int mic_space;
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if (!hw_key)
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return 0;
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if (hw_key->cipher == WLAN_CIPHER_SUITE_AES_CMAC)
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return 0;
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mic_space = (hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) ? 8 : 0;
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return hw_key->icv_len + mic_space;
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}
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static int wfx_tx_inner(struct wfx_vif *wvif, struct ieee80211_sta *sta, struct sk_buff *skb)
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{
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struct wfx_hif_msg *hif_msg;
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struct wfx_hif_req_tx *req;
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struct wfx_tx_priv *tx_priv;
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struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
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struct ieee80211_key_conf *hw_key = tx_info->control.hw_key;
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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int queue_id = skb_get_queue_mapping(skb);
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size_t offset = (size_t)skb->data & 3;
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int wmsg_len = sizeof(struct wfx_hif_msg) + sizeof(struct wfx_hif_req_tx) + offset;
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WARN(queue_id >= IEEE80211_NUM_ACS, "unsupported queue_id");
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wfx_tx_fixup_rates(tx_info->driver_rates);
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/* From now tx_info->control is unusable */
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memset(tx_info->rate_driver_data, 0, sizeof(struct wfx_tx_priv));
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/* Fill tx_priv */
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tx_priv = (struct wfx_tx_priv *)tx_info->rate_driver_data;
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tx_priv->icv_size = wfx_tx_get_icv_len(hw_key);
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/* Fill hif_msg */
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WARN(skb_headroom(skb) < wmsg_len, "not enough space in skb");
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WARN(offset & 1, "attempt to transmit an unaligned frame");
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skb_put(skb, tx_priv->icv_size);
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skb_push(skb, wmsg_len);
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memset(skb->data, 0, wmsg_len);
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hif_msg = (struct wfx_hif_msg *)skb->data;
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hif_msg->len = cpu_to_le16(skb->len);
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hif_msg->id = HIF_REQ_ID_TX;
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hif_msg->interface = wvif->id;
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if (skb->len > le16_to_cpu(wvif->wdev->hw_caps.size_inp_ch_buf)) {
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dev_warn(wvif->wdev->dev,
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"requested frame size (%d) is larger than maximum supported (%d)\n",
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skb->len, le16_to_cpu(wvif->wdev->hw_caps.size_inp_ch_buf));
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skb_pull(skb, wmsg_len);
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return -EIO;
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}
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/* Fill tx request */
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req = (struct wfx_hif_req_tx *)hif_msg->body;
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/* packet_id just need to be unique on device. 32bits are more than necessary for that task,
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* so we take advantage of it to add some extra data for debug.
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*/
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req->packet_id = atomic_add_return(1, &wvif->wdev->packet_id) & 0xFFFF;
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req->packet_id |= IEEE80211_SEQ_TO_SN(le16_to_cpu(hdr->seq_ctrl)) << 16;
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req->packet_id |= queue_id << 28;
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req->fc_offset = offset;
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/* Queue index are inverted between firmware and Linux */
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req->queue_id = 3 - queue_id;
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req->peer_sta_id = wfx_tx_get_link_id(wvif, sta, hdr);
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req->retry_policy_index = wfx_tx_get_retry_policy_id(wvif, tx_info);
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req->frame_format = wfx_tx_get_frame_format(tx_info);
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if (tx_info->driver_rates[0].flags & IEEE80211_TX_RC_SHORT_GI)
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req->short_gi = 1;
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if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM)
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req->after_dtim = 1;
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/* Auxiliary operations */
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wfx_tx_queues_put(wvif, skb);
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if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM)
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schedule_work(&wvif->update_tim_work);
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wfx_bh_request_tx(wvif->wdev);
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return 0;
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}
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void wfx_tx(struct ieee80211_hw *hw, struct ieee80211_tx_control *control, struct sk_buff *skb)
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{
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struct wfx_dev *wdev = hw->priv;
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struct wfx_vif *wvif;
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struct ieee80211_sta *sta = control ? control->sta : NULL;
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struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
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struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
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size_t driver_data_room = sizeof_field(struct ieee80211_tx_info, rate_driver_data);
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BUILD_BUG_ON_MSG(sizeof(struct wfx_tx_priv) > driver_data_room,
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"struct tx_priv is too large");
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WARN(skb->next || skb->prev, "skb is already member of a list");
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/* control.vif can be NULL for injected frames */
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if (tx_info->control.vif)
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wvif = (struct wfx_vif *)tx_info->control.vif->drv_priv;
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else
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wvif = wvif_iterate(wdev, NULL);
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if (WARN_ON(!wvif))
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goto drop;
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/* Because of TX_AMPDU_SETUP_IN_HW, mac80211 does not try to send any BlockAck session
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* management frame. The check below exist just in case.
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*/
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if (wfx_is_action_back(hdr)) {
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dev_info(wdev->dev, "drop BA action\n");
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goto drop;
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}
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if (wfx_tx_inner(wvif, sta, skb))
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goto drop;
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return;
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drop:
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ieee80211_tx_status_irqsafe(wdev->hw, skb);
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}
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static void wfx_skb_dtor(struct wfx_vif *wvif, struct sk_buff *skb)
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{
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struct wfx_hif_msg *hif = (struct wfx_hif_msg *)skb->data;
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struct wfx_hif_req_tx *req = (struct wfx_hif_req_tx *)hif->body;
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unsigned int offset = sizeof(struct wfx_hif_msg) + sizeof(struct wfx_hif_req_tx) +
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req->fc_offset;
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if (!wvif) {
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pr_warn("vif associated with the skb does not exist anymore\n");
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return;
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}
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wfx_tx_policy_put(wvif, req->retry_policy_index);
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skb_pull(skb, offset);
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ieee80211_tx_status_irqsafe(wvif->wdev->hw, skb);
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}
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static void wfx_tx_fill_rates(struct wfx_dev *wdev, struct ieee80211_tx_info *tx_info,
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const struct wfx_hif_cnf_tx *arg)
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{
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struct ieee80211_tx_rate *rate;
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int tx_count;
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int i;
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tx_count = arg->ack_failures;
|
|
if (!arg->status || arg->ack_failures)
|
|
tx_count += 1; /* Also report success */
|
|
for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
|
|
rate = &tx_info->status.rates[i];
|
|
if (rate->idx < 0)
|
|
break;
|
|
if (tx_count < rate->count && arg->status == HIF_STATUS_TX_FAIL_RETRIES &&
|
|
arg->ack_failures)
|
|
dev_dbg(wdev->dev, "all retries were not consumed: %d != %d\n",
|
|
rate->count, tx_count);
|
|
if (tx_count <= rate->count && tx_count &&
|
|
arg->txed_rate != wfx_get_hw_rate(wdev, rate))
|
|
dev_dbg(wdev->dev, "inconsistent tx_info rates: %d != %d\n",
|
|
arg->txed_rate, wfx_get_hw_rate(wdev, rate));
|
|
if (tx_count > rate->count) {
|
|
tx_count -= rate->count;
|
|
} else if (!tx_count) {
|
|
rate->count = 0;
|
|
rate->idx = -1;
|
|
} else {
|
|
rate->count = tx_count;
|
|
tx_count = 0;
|
|
}
|
|
}
|
|
if (tx_count)
|
|
dev_dbg(wdev->dev, "%d more retries than expected\n", tx_count);
|
|
}
|
|
|
|
void wfx_tx_confirm_cb(struct wfx_dev *wdev, const struct wfx_hif_cnf_tx *arg)
|
|
{
|
|
const struct wfx_tx_priv *tx_priv;
|
|
struct ieee80211_tx_info *tx_info;
|
|
struct wfx_vif *wvif;
|
|
struct sk_buff *skb;
|
|
|
|
skb = wfx_pending_get(wdev, arg->packet_id);
|
|
if (!skb) {
|
|
dev_warn(wdev->dev, "received unknown packet_id (%#.8x) from chip\n",
|
|
arg->packet_id);
|
|
return;
|
|
}
|
|
tx_info = IEEE80211_SKB_CB(skb);
|
|
tx_priv = wfx_skb_tx_priv(skb);
|
|
wvif = wdev_to_wvif(wdev, ((struct wfx_hif_msg *)skb->data)->interface);
|
|
WARN_ON(!wvif);
|
|
if (!wvif)
|
|
return;
|
|
|
|
/* Note that wfx_pending_get_pkt_us_delay() get data from tx_info */
|
|
_trace_tx_stats(arg, skb, wfx_pending_get_pkt_us_delay(wdev, skb));
|
|
wfx_tx_fill_rates(wdev, tx_info, arg);
|
|
skb_trim(skb, skb->len - tx_priv->icv_size);
|
|
|
|
/* From now, you can touch to tx_info->status, but do not touch to tx_priv anymore */
|
|
/* FIXME: use ieee80211_tx_info_clear_status() */
|
|
memset(tx_info->rate_driver_data, 0, sizeof(tx_info->rate_driver_data));
|
|
memset(tx_info->pad, 0, sizeof(tx_info->pad));
|
|
|
|
if (!arg->status) {
|
|
tx_info->status.tx_time = le32_to_cpu(arg->media_delay) -
|
|
le32_to_cpu(arg->tx_queue_delay);
|
|
if (tx_info->flags & IEEE80211_TX_CTL_NO_ACK)
|
|
tx_info->flags |= IEEE80211_TX_STAT_NOACK_TRANSMITTED;
|
|
else
|
|
tx_info->flags |= IEEE80211_TX_STAT_ACK;
|
|
} else if (arg->status == HIF_STATUS_TX_FAIL_REQUEUE) {
|
|
WARN(!arg->requeue, "incoherent status and result_flags");
|
|
if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) {
|
|
wvif->after_dtim_tx_allowed = false; /* DTIM period elapsed */
|
|
schedule_work(&wvif->update_tim_work);
|
|
}
|
|
tx_info->flags |= IEEE80211_TX_STAT_TX_FILTERED;
|
|
}
|
|
wfx_skb_dtor(wvif, skb);
|
|
}
|
|
|
|
static void wfx_flush_vif(struct wfx_vif *wvif, u32 queues, struct sk_buff_head *dropped)
|
|
{
|
|
struct wfx_queue *queue;
|
|
int i;
|
|
|
|
for (i = 0; i < IEEE80211_NUM_ACS; i++) {
|
|
if (!(BIT(i) & queues))
|
|
continue;
|
|
queue = &wvif->tx_queue[i];
|
|
if (dropped)
|
|
wfx_tx_queue_drop(wvif, queue, dropped);
|
|
}
|
|
if (wvif->wdev->chip_frozen)
|
|
return;
|
|
for (i = 0; i < IEEE80211_NUM_ACS; i++) {
|
|
if (!(BIT(i) & queues))
|
|
continue;
|
|
queue = &wvif->tx_queue[i];
|
|
if (wait_event_timeout(wvif->wdev->tx_dequeue, wfx_tx_queue_empty(wvif, queue),
|
|
msecs_to_jiffies(1000)) <= 0)
|
|
dev_warn(wvif->wdev->dev, "frames queued while flushing tx queues?");
|
|
}
|
|
}
|
|
|
|
void wfx_flush(struct ieee80211_hw *hw, struct ieee80211_vif *vif, u32 queues, bool drop)
|
|
{
|
|
struct wfx_dev *wdev = hw->priv;
|
|
struct sk_buff_head dropped;
|
|
struct wfx_vif *wvif;
|
|
struct wfx_hif_msg *hif;
|
|
struct sk_buff *skb;
|
|
|
|
skb_queue_head_init(&dropped);
|
|
if (vif) {
|
|
wvif = (struct wfx_vif *)vif->drv_priv;
|
|
wfx_flush_vif(wvif, queues, drop ? &dropped : NULL);
|
|
} else {
|
|
wvif = NULL;
|
|
while ((wvif = wvif_iterate(wdev, wvif)) != NULL)
|
|
wfx_flush_vif(wvif, queues, drop ? &dropped : NULL);
|
|
}
|
|
wfx_tx_flush(wdev);
|
|
if (wdev->chip_frozen)
|
|
wfx_pending_drop(wdev, &dropped);
|
|
while ((skb = skb_dequeue(&dropped)) != NULL) {
|
|
hif = (struct wfx_hif_msg *)skb->data;
|
|
wvif = wdev_to_wvif(wdev, hif->interface);
|
|
ieee80211_tx_info_clear_status(IEEE80211_SKB_CB(skb));
|
|
wfx_skb_dtor(wvif, skb);
|
|
}
|
|
}
|