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Miller" , devicetree@vger.kernel.org, Rob Herring , linux-mmc@vger.kernel.org, =?utf-8?q?Pali_Roh=C3=A1r?= , Ulf Hansson , =?utf-8?b?SsOpcsO0bWUg?= =?utf-8?q?Pouiller?= Subject: [PATCH v2 18/24] wfx: add data_tx.c/data_tx.h Date: Tue, 20 Oct 2020 14:58:11 +0200 Message-Id: <20201020125817.1632995-19-Jerome.Pouiller@silabs.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201020125817.1632995-1-Jerome.Pouiller@silabs.com> References: <20201020125817.1632995-1-Jerome.Pouiller@silabs.com> X-Originating-IP: [37.71.187.125] X-ClientProxiedBy: PR3P192CA0026.EURP192.PROD.OUTLOOK.COM (2603:10a6:102:56::31) To SN6PR11MB2718.namprd11.prod.outlook.com (2603:10b6:805:63::18) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from pc-42.silabs.com (37.71.187.125) by PR3P192CA0026.EURP192.PROD.OUTLOOK.COM (2603:10a6:102:56::31) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3477.21 via Frontend Transport; Tue, 20 Oct 2020 12:59:22 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 39f84934-e422-407f-340c-08d874f7f82c X-MS-TrafficTypeDiagnostic: SN6PR11MB3040: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:5516; 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+ + if (rate->idx < 0) + return -1; + if (rate->flags & IEEE80211_TX_RC_MCS) { + if (rate->idx > 7) { + WARN(1, "wrong rate->idx value: %d", rate->idx); + return -1; + } + return rate->idx + 14; + } + // WFx only support 2GHz, else band information should be retrieved + // from ieee80211_tx_info + band = wdev->hw->wiphy->bands[NL80211_BAND_2GHZ]; + if (rate->idx >= band->n_bitrates) { + WARN(1, "wrong rate->idx value: %d", rate->idx); + return -1; + } + return band->bitrates[rate->idx].hw_value; +} + +/* TX policy cache implementation */ + +static void wfx_tx_policy_build(struct wfx_vif *wvif, struct tx_policy *policy, + struct ieee80211_tx_rate *rates) +{ + struct wfx_dev *wdev = wvif->wdev; + int i, rateid; + u8 count; + + WARN(rates[0].idx < 0, "invalid rate policy"); + memset(policy, 0, sizeof(*policy)); + for (i = 0; i < IEEE80211_TX_MAX_RATES; ++i) { + if (rates[i].idx < 0) + break; + WARN_ON(rates[i].count > 15); + rateid = wfx_get_hw_rate(wdev, &rates[i]); + // Pack two values in each byte of policy->rates + count = rates[i].count; + if (rateid % 2) + count <<= 4; + policy->rates[rateid / 2] |= count; + } +} + +static bool tx_policy_is_equal(const struct tx_policy *a, + const struct tx_policy *b) +{ + return !memcmp(a->rates, b->rates, sizeof(a->rates)); +} + +static int wfx_tx_policy_find(struct tx_policy_cache *cache, + struct tx_policy *wanted) +{ + struct tx_policy *it; + + list_for_each_entry(it, &cache->used, link) + if (tx_policy_is_equal(wanted, it)) + return it - cache->cache; + list_for_each_entry(it, &cache->free, link) + if (tx_policy_is_equal(wanted, it)) + return it - cache->cache; + return -1; +} + +static void wfx_tx_policy_use(struct tx_policy_cache *cache, + struct tx_policy *entry) +{ + ++entry->usage_count; + list_move(&entry->link, &cache->used); +} + +static int wfx_tx_policy_release(struct tx_policy_cache *cache, + struct tx_policy *entry) +{ + int ret = --entry->usage_count; + + if (!ret) + list_move(&entry->link, &cache->free); + return ret; +} + +static int wfx_tx_policy_get(struct wfx_vif *wvif, + struct ieee80211_tx_rate *rates, bool *renew) +{ + int idx; + struct tx_policy_cache *cache = &wvif->tx_policy_cache; + struct tx_policy wanted; + + wfx_tx_policy_build(wvif, &wanted, rates); + + spin_lock_bh(&cache->lock); + if (list_empty(&cache->free)) { + WARN(1, "unable to get a valid Tx policy"); + spin_unlock_bh(&cache->lock); + return HIF_TX_RETRY_POLICY_INVALID; + } + idx = wfx_tx_policy_find(cache, &wanted); + if (idx >= 0) { + *renew = false; + } else { + struct tx_policy *entry; + *renew = true; + /* If policy is not found create a new one + * using the oldest entry in "free" list + */ + entry = list_entry(cache->free.prev, struct tx_policy, link); + memcpy(entry->rates, wanted.rates, sizeof(entry->rates)); + entry->uploaded = false; + entry->usage_count = 0; + idx = entry - cache->cache; + } + wfx_tx_policy_use(cache, &cache->cache[idx]); + if (list_empty(&cache->free)) + ieee80211_stop_queues(wvif->wdev->hw); + spin_unlock_bh(&cache->lock); + return idx; +} + +static void wfx_tx_policy_put(struct wfx_vif *wvif, int idx) +{ + int usage, locked; + struct tx_policy_cache *cache = &wvif->tx_policy_cache; + + if (idx == HIF_TX_RETRY_POLICY_INVALID) + return; + spin_lock_bh(&cache->lock); + locked = list_empty(&cache->free); + usage = wfx_tx_policy_release(cache, &cache->cache[idx]); + if (locked && !usage) + ieee80211_wake_queues(wvif->wdev->hw); + spin_unlock_bh(&cache->lock); +} + +static int wfx_tx_policy_upload(struct wfx_vif *wvif) +{ + struct tx_policy *policies = wvif->tx_policy_cache.cache; + u8 tmp_rates[12]; + int i, is_used; + + do { + spin_lock_bh(&wvif->tx_policy_cache.lock); + for (i = 0; i < ARRAY_SIZE(wvif->tx_policy_cache.cache); ++i) { + is_used = memzcmp(policies[i].rates, + sizeof(policies[i].rates)); + if (!policies[i].uploaded && is_used) + break; + } + if (i < ARRAY_SIZE(wvif->tx_policy_cache.cache)) { + policies[i].uploaded = true; + memcpy(tmp_rates, policies[i].rates, sizeof(tmp_rates)); + spin_unlock_bh(&wvif->tx_policy_cache.lock); + hif_set_tx_rate_retry_policy(wvif, i, tmp_rates); + } else { + spin_unlock_bh(&wvif->tx_policy_cache.lock); + } + } while (i < ARRAY_SIZE(wvif->tx_policy_cache.cache)); + return 0; +} + +void wfx_tx_policy_upload_work(struct work_struct *work) +{ + struct wfx_vif *wvif = + container_of(work, struct wfx_vif, tx_policy_upload_work); + + wfx_tx_policy_upload(wvif); + wfx_tx_unlock(wvif->wdev); +} + +void wfx_tx_policy_init(struct wfx_vif *wvif) +{ + struct tx_policy_cache *cache = &wvif->tx_policy_cache; + int i; + + memset(cache, 0, sizeof(*cache)); + + spin_lock_init(&cache->lock); + INIT_LIST_HEAD(&cache->used); + INIT_LIST_HEAD(&cache->free); + + for (i = 0; i < ARRAY_SIZE(cache->cache); ++i) + list_add(&cache->cache[i].link, &cache->free); +} + +/* Tx implementation */ + +static bool ieee80211_is_action_back(struct ieee80211_hdr *hdr) +{ + struct ieee80211_mgmt *mgmt = (struct ieee80211_mgmt *)hdr; + + if (!ieee80211_is_action(mgmt->frame_control)) + return false; + if (mgmt->u.action.category != WLAN_CATEGORY_BACK) + return false; + return true; +} + +static u8 wfx_tx_get_link_id(struct wfx_vif *wvif, struct ieee80211_sta *sta, + struct ieee80211_hdr *hdr) +{ + struct wfx_sta_priv *sta_priv = + sta ? (struct wfx_sta_priv *)&sta->drv_priv : NULL; + const u8 *da = ieee80211_get_DA(hdr); + + if (sta_priv && sta_priv->link_id) + return sta_priv->link_id; + if (wvif->vif->type != NL80211_IFTYPE_AP) + return 0; + if (is_multicast_ether_addr(da)) + return 0; + return HIF_LINK_ID_NOT_ASSOCIATED; +} + +static void wfx_tx_fixup_rates(struct ieee80211_tx_rate *rates) +{ + int i; + bool finished; + + // Firmware is not able to mix rates with different flags + for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { + if (rates[0].flags & IEEE80211_TX_RC_SHORT_GI) + rates[i].flags |= IEEE80211_TX_RC_SHORT_GI; + if (!(rates[0].flags & IEEE80211_TX_RC_SHORT_GI)) + rates[i].flags &= ~IEEE80211_TX_RC_SHORT_GI; + if (!(rates[0].flags & IEEE80211_TX_RC_USE_RTS_CTS)) + rates[i].flags &= ~IEEE80211_TX_RC_USE_RTS_CTS; + } + + // Sort rates and remove duplicates + do { + finished = true; + for (i = 0; i < IEEE80211_TX_MAX_RATES - 1; i++) { + if (rates[i + 1].idx == rates[i].idx && + rates[i].idx != -1) { + rates[i].count += rates[i + 1].count; + if (rates[i].count > 15) + rates[i].count = 15; + rates[i + 1].idx = -1; + rates[i + 1].count = 0; + + finished = false; + } + if (rates[i + 1].idx > rates[i].idx) { + swap(rates[i + 1], rates[i]); + finished = false; + } + } + } while (!finished); + // Ensure that MCS0 or 1Mbps is present at the end of the retry list + for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) { + if (rates[i].idx == 0) + break; + if (rates[i].idx == -1) { + rates[i].idx = 0; + rates[i].count = 8; // == hw->max_rate_tries + rates[i].flags = rates[i - 1].flags & + IEEE80211_TX_RC_MCS; + break; + } + } + // All retries use long GI + for (i = 1; i < IEEE80211_TX_MAX_RATES; i++) + rates[i].flags &= ~IEEE80211_TX_RC_SHORT_GI; +} + +static u8 wfx_tx_get_rate_id(struct wfx_vif *wvif, + struct ieee80211_tx_info *tx_info) +{ + bool tx_policy_renew = false; + u8 rate_id; + + rate_id = wfx_tx_policy_get(wvif, + tx_info->driver_rates, &tx_policy_renew); + if (rate_id == HIF_TX_RETRY_POLICY_INVALID) + dev_warn(wvif->wdev->dev, "unable to get a valid Tx policy"); + + if (tx_policy_renew) { + wfx_tx_lock(wvif->wdev); + if (!schedule_work(&wvif->tx_policy_upload_work)) + wfx_tx_unlock(wvif->wdev); + } + return rate_id; +} + +static int wfx_tx_get_frame_format(struct ieee80211_tx_info *tx_info) +{ + if (!(tx_info->driver_rates[0].flags & IEEE80211_TX_RC_MCS)) + return HIF_FRAME_FORMAT_NON_HT; + else if (!(tx_info->driver_rates[0].flags & IEEE80211_TX_RC_GREEN_FIELD)) + return HIF_FRAME_FORMAT_MIXED_FORMAT_HT; + else + return HIF_FRAME_FORMAT_GF_HT_11N; +} + +static int wfx_tx_get_icv_len(struct ieee80211_key_conf *hw_key) +{ + int mic_space; + + if (!hw_key) + return 0; + if (hw_key->cipher == WLAN_CIPHER_SUITE_AES_CMAC) + return 0; + mic_space = (hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) ? 8 : 0; + return hw_key->icv_len + mic_space; +} + +static int wfx_tx_inner(struct wfx_vif *wvif, struct ieee80211_sta *sta, + struct sk_buff *skb) +{ + struct hif_msg *hif_msg; + struct hif_req_tx *req; + struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); + struct ieee80211_key_conf *hw_key = tx_info->control.hw_key; + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + int queue_id = skb_get_queue_mapping(skb); + size_t offset = (size_t)skb->data & 3; + int wmsg_len = sizeof(struct hif_msg) + + sizeof(struct hif_req_tx) + offset; + + WARN(queue_id >= IEEE80211_NUM_ACS, "unsupported queue_id"); + wfx_tx_fixup_rates(tx_info->driver_rates); + + // From now tx_info->control is unusable + memset(tx_info->rate_driver_data, 0, sizeof(struct wfx_tx_priv)); + + // Fill hif_msg + WARN(skb_headroom(skb) < wmsg_len, "not enough space in skb"); + WARN(offset & 1, "attempt to transmit an unaligned frame"); + skb_put(skb, wfx_tx_get_icv_len(hw_key)); + skb_push(skb, wmsg_len); + memset(skb->data, 0, wmsg_len); + hif_msg = (struct hif_msg *)skb->data; + hif_msg->len = cpu_to_le16(skb->len); + hif_msg->id = HIF_REQ_ID_TX; + hif_msg->interface = wvif->id; + if (skb->len > wvif->wdev->hw_caps.size_inp_ch_buf) { + dev_warn(wvif->wdev->dev, + "requested frame size (%d) is larger than maximum supported (%d)\n", + skb->len, wvif->wdev->hw_caps.size_inp_ch_buf); + skb_pull(skb, wmsg_len); + return -EIO; + } + + // Fill tx request + req = (struct hif_req_tx *)hif_msg->body; + // packet_id just need to be unique on device. 32bits are more than + // necessary for that task, so we tae advantage of it to add some extra + // data for debug. + req->packet_id = atomic_add_return(1, &wvif->wdev->packet_id) & 0xFFFF; + req->packet_id |= IEEE80211_SEQ_TO_SN(le16_to_cpu(hdr->seq_ctrl)) << 16; + req->packet_id |= queue_id << 28; + + req->fc_offset = offset; + if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) + req->after_dtim = 1; + req->peer_sta_id = wfx_tx_get_link_id(wvif, sta, hdr); + // Queue index are inverted between firmware and Linux + req->queue_id = 3 - queue_id; + req->retry_policy_index = wfx_tx_get_rate_id(wvif, tx_info); + req->frame_format = wfx_tx_get_frame_format(tx_info); + if (tx_info->driver_rates[0].flags & IEEE80211_TX_RC_SHORT_GI) + req->short_gi = 1; + + // Auxiliary operations + wfx_tx_queues_put(wvif, skb); + if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) + schedule_work(&wvif->update_tim_work); + wfx_bh_request_tx(wvif->wdev); + return 0; +} + +void wfx_tx(struct ieee80211_hw *hw, struct ieee80211_tx_control *control, + struct sk_buff *skb) +{ + struct wfx_dev *wdev = hw->priv; + struct wfx_vif *wvif; + struct ieee80211_sta *sta = control ? control->sta : NULL; + struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); + struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data; + size_t driver_data_room = sizeof_field(struct ieee80211_tx_info, + rate_driver_data); + + compiletime_assert(sizeof(struct wfx_tx_priv) <= driver_data_room, + "struct tx_priv is too large"); + WARN(skb->next || skb->prev, "skb is already member of a list"); + // control.vif can be NULL for injected frames + if (tx_info->control.vif) + wvif = (struct wfx_vif *)tx_info->control.vif->drv_priv; + else + wvif = wvif_iterate(wdev, NULL); + if (WARN_ON(!wvif)) + goto drop; + // Because of TX_AMPDU_SETUP_IN_HW, mac80211 does not try to send any + // BlockAck session management frame. The check below exist just in case. + if (ieee80211_is_action_back(hdr)) { + dev_info(wdev->dev, "drop BA action\n"); + goto drop; + } + if (wfx_tx_inner(wvif, sta, skb)) + goto drop; + + return; + +drop: + ieee80211_tx_status_irqsafe(wdev->hw, skb); +} + +static void wfx_skb_dtor(struct wfx_vif *wvif, struct sk_buff *skb) +{ + struct hif_msg *hif = (struct hif_msg *)skb->data; + struct hif_req_tx *req = (struct hif_req_tx *)hif->body; + unsigned int offset = sizeof(struct hif_msg) + + sizeof(struct hif_req_tx) + + req->fc_offset; + + if (!wvif) { + pr_warn("vif associated with the skb does not exist anymore\n"); + return; + } + wfx_tx_policy_put(wvif, req->retry_policy_index); + skb_pull(skb, offset); + ieee80211_tx_status_irqsafe(wvif->wdev->hw, skb); +} + +static void wfx_tx_fill_rates(struct wfx_dev *wdev, + struct ieee80211_tx_info *tx_info, + const struct hif_cnf_tx *arg) +{ + struct ieee80211_tx_rate *rate; + int tx_count; + int i; + + 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 hif_cnf_tx *arg) +{ + 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); + wvif = wdev_to_wvif(wdev, ((struct 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); + // 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 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 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); + } +} diff --git a/drivers/net/wireless/silabs/wfx/data_tx.h b/drivers/net/wireless/silabs/wfx/data_tx.h new file mode 100644 index 000000000000..46c9fff7a870 --- /dev/null +++ b/drivers/net/wireless/silabs/wfx/data_tx.h @@ -0,0 +1,67 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Datapath implementation. + * + * Copyright (c) 2017-2020, Silicon Laboratories, Inc. + * Copyright (c) 2010, ST-Ericsson + */ +#ifndef WFX_DATA_TX_H +#define WFX_DATA_TX_H + +#include +#include + +#include "hif_api_cmd.h" +#include "hif_api_mib.h" + +struct wfx_tx_priv; +struct wfx_dev; +struct wfx_vif; + +struct tx_policy { + struct list_head link; + int usage_count; + u8 rates[12]; + bool uploaded; +}; + +struct tx_policy_cache { + struct tx_policy cache[HIF_TX_RETRY_POLICY_MAX]; + // FIXME: use a trees and drop hash from tx_policy + struct list_head used; + struct list_head free; + spinlock_t lock; +}; + +struct wfx_tx_priv { + ktime_t xmit_timestamp; +}; + +void wfx_tx_policy_init(struct wfx_vif *wvif); +void wfx_tx_policy_upload_work(struct work_struct *work); + +void wfx_tx(struct ieee80211_hw *hw, struct ieee80211_tx_control *control, + struct sk_buff *skb); +void wfx_tx_confirm_cb(struct wfx_dev *wdev, const struct hif_cnf_tx *arg); +void wfx_flush(struct ieee80211_hw *hw, struct ieee80211_vif *vif, + u32 queues, bool drop); + +static inline struct wfx_tx_priv *wfx_skb_tx_priv(struct sk_buff *skb) +{ + struct ieee80211_tx_info *tx_info; + + if (!skb) + return NULL; + tx_info = IEEE80211_SKB_CB(skb); + return (struct wfx_tx_priv *)tx_info->rate_driver_data; +} + +static inline struct hif_req_tx *wfx_skb_txreq(struct sk_buff *skb) +{ + struct hif_msg *hif = (struct hif_msg *)skb->data; + struct hif_req_tx *req = (struct hif_req_tx *)hif->body; + + return req; +} + +#endif /* WFX_DATA_TX_H */