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* This file is part of wl1251
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* Copyright (c) 1998-2007 Texas Instruments Incorporated
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* Copyright (C) 2008 Nokia Corporation
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* Contact: Kalle Valo <kalle.valo@nokia.com>
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation.
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include "wl1251_reg.h"
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#include "wl1251_tx.h"
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#include "wl1251_ps.h"
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#include "wl1251_io.h"
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static bool wl1251_tx_double_buffer_busy(struct wl1251 *wl, u32 data_out_count)
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int used, data_in_count;
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data_in_count = wl->data_in_count;
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if (data_in_count < data_out_count)
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/* data_in_count has wrapped */
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data_in_count += TX_STATUS_DATA_OUT_COUNT_MASK + 1;
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used = data_in_count - data_out_count;
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WARN_ON(used > DP_TX_PACKET_RING_CHUNK_NUM);
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if (used >= DP_TX_PACKET_RING_CHUNK_NUM)
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static int wl1251_tx_path_status(struct wl1251 *wl)
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u32 status, addr, data_out_count;
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addr = wl->data_path->tx_control_addr;
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status = wl1251_mem_read32(wl, addr);
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data_out_count = status & TX_STATUS_DATA_OUT_COUNT_MASK;
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busy = wl1251_tx_double_buffer_busy(wl, data_out_count);
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static int wl1251_tx_id(struct wl1251 *wl, struct sk_buff *skb)
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for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; i++)
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if (wl->tx_frames[i] == NULL) {
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wl->tx_frames[i] = skb;
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static void wl1251_tx_control(struct tx_double_buffer_desc *tx_hdr,
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struct ieee80211_tx_info *control, u16 fc)
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*(u16 *)&tx_hdr->control = 0;
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tx_hdr->control.rate_policy = 0;
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tx_hdr->control.packet_type = 0;
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if (control->flags & IEEE80211_TX_CTL_NO_ACK)
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tx_hdr->control.ack_policy = 1;
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tx_hdr->control.tx_complete = 1;
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if ((fc & IEEE80211_FTYPE_DATA) &&
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((fc & IEEE80211_STYPE_QOS_DATA) ||
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(fc & IEEE80211_STYPE_QOS_NULLFUNC)))
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tx_hdr->control.qos = 1;
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/* RSN + MIC = 8 + 8 = 16 bytes (worst case - AES). */
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#define MAX_MSDU_SECURITY_LENGTH 16
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#define MAX_MPDU_SECURITY_LENGTH 16
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#define WLAN_QOS_HDR_LEN 26
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#define MAX_MPDU_HEADER_AND_SECURITY (MAX_MPDU_SECURITY_LENGTH + \
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#define HW_BLOCK_SIZE 252
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static void wl1251_tx_frag_block_num(struct tx_double_buffer_desc *tx_hdr)
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u16 payload_len, frag_threshold, mem_blocks;
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u16 num_mpdus, mem_blocks_per_frag;
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frag_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
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tx_hdr->frag_threshold = cpu_to_le16(frag_threshold);
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payload_len = tx_hdr->length + MAX_MSDU_SECURITY_LENGTH;
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if (payload_len > frag_threshold) {
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mem_blocks_per_frag =
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((frag_threshold + MAX_MPDU_HEADER_AND_SECURITY) /
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num_mpdus = payload_len / frag_threshold;
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mem_blocks = num_mpdus * mem_blocks_per_frag;
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payload_len -= num_mpdus * frag_threshold;
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mem_blocks_per_frag = 0;
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mem_blocks += (payload_len / HW_BLOCK_SIZE) + 1;
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mem_blocks += min(num_mpdus, mem_blocks_per_frag);
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tx_hdr->num_mem_blocks = mem_blocks;
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static int wl1251_tx_fill_hdr(struct wl1251 *wl, struct sk_buff *skb,
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struct ieee80211_tx_info *control)
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struct tx_double_buffer_desc *tx_hdr;
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struct ieee80211_rate *rate;
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id = wl1251_tx_id(wl, skb);
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fc = *(u16 *)skb->data;
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tx_hdr = (struct tx_double_buffer_desc *) skb_push(skb,
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tx_hdr->length = cpu_to_le16(skb->len - sizeof(*tx_hdr));
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rate = ieee80211_get_tx_rate(wl->hw, control);
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tx_hdr->rate = cpu_to_le16(rate->hw_value);
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tx_hdr->expiry_time = cpu_to_le32(1 << 16);
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/* FIXME: how to get the correct queue id? */
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tx_hdr->xmit_queue = 0;
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wl1251_tx_control(tx_hdr, control, fc);
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wl1251_tx_frag_block_num(tx_hdr);
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/* We copy the packet to the target */
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static int wl1251_tx_send_packet(struct wl1251 *wl, struct sk_buff *skb,
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struct ieee80211_tx_info *control)
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struct tx_double_buffer_desc *tx_hdr;
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tx_hdr = (struct tx_double_buffer_desc *) skb->data;
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if (control->control.hw_key &&
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control->control.hw_key->alg == ALG_TKIP) {
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fc = *(u16 *)(skb->data + sizeof(*tx_hdr));
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tx_hdr->length += WL1251_TKIP_IV_SPACE;
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hdrlen = ieee80211_hdrlen(fc);
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pos = skb_push(skb, WL1251_TKIP_IV_SPACE);
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memmove(pos, pos + WL1251_TKIP_IV_SPACE,
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sizeof(*tx_hdr) + hdrlen);
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/* Revisit. This is a workaround for getting non-aligned packets.
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This happens at least with EAPOL packets from the user space.
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Our DMA requires packets to be aligned on a 4-byte boundary.
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if (unlikely((long)skb->data & 0x03)) {
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int offset = (4 - (long)skb->data) & 0x03;
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wl1251_debug(DEBUG_TX, "skb offset %d", offset);
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/* check whether the current skb can be used */
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if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
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unsigned char *src = skb->data;
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/* align the buffer on a 4-byte boundary */
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skb_reserve(skb, offset);
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memmove(skb->data, src, skb->len);
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wl1251_info("No handler, fixme!");
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/* Our skb->data at this point includes the HW header */
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len = WL1251_TX_ALIGN(skb->len);
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if (wl->data_in_count & 0x1)
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addr = wl->data_path->tx_packet_ring_addr +
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wl->data_path->tx_packet_ring_chunk_size;
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addr = wl->data_path->tx_packet_ring_addr;
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wl1251_mem_write(wl, addr, skb->data, len);
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wl1251_debug(DEBUG_TX, "tx id %u skb 0x%p payload %u rate 0x%x",
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tx_hdr->id, skb, tx_hdr->length, tx_hdr->rate);
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static void wl1251_tx_trigger(struct wl1251 *wl)
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if (wl->data_in_count & 0x1) {
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addr = ACX_REG_INTERRUPT_TRIG_H;
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data = INTR_TRIG_TX_PROC1;
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addr = ACX_REG_INTERRUPT_TRIG;
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data = INTR_TRIG_TX_PROC0;
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wl1251_reg_write32(wl, addr, data);
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/* Bumping data in */
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wl->data_in_count = (wl->data_in_count + 1) &
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TX_STATUS_DATA_OUT_COUNT_MASK;
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/* caller must hold wl->mutex */
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static int wl1251_tx_frame(struct wl1251 *wl, struct sk_buff *skb)
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struct ieee80211_tx_info *info;
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info = IEEE80211_SKB_CB(skb);
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if (info->control.hw_key) {
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idx = info->control.hw_key->hw_key_idx;
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if (unlikely(wl->default_key != idx)) {
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ret = wl1251_acx_default_key(wl, idx);
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ret = wl1251_tx_path_status(wl);
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ret = wl1251_tx_fill_hdr(wl, skb, info);
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ret = wl1251_tx_send_packet(wl, skb, info);
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wl1251_tx_trigger(wl);
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void wl1251_tx_work(struct work_struct *work)
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struct wl1251 *wl = container_of(work, struct wl1251, tx_work);
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bool woken_up = false;
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mutex_lock(&wl->mutex);
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if (unlikely(wl->state == WL1251_STATE_OFF))
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while ((skb = skb_dequeue(&wl->tx_queue))) {
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ret = wl1251_ps_elp_wakeup(wl);
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ret = wl1251_tx_frame(wl, skb);
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/* firmware buffer is full, stop queues */
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wl1251_debug(DEBUG_TX, "tx_work: fw buffer full, "
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ieee80211_stop_queues(wl->hw);
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wl->tx_queue_stopped = true;
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skb_queue_head(&wl->tx_queue, skb);
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} else if (ret < 0) {
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wl1251_ps_elp_sleep(wl);
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mutex_unlock(&wl->mutex);
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static const char *wl1251_tx_parse_status(u8 status)
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/* 8 bit status field, one character per bit plus null */
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memset(buf, 0, sizeof(buf));
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if (status & TX_DMA_ERROR)
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if (status & TX_DISABLED)
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if (status & TX_RETRY_EXCEEDED)
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if (status & TX_TIMEOUT)
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if (status & TX_KEY_NOT_FOUND)
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if (status & TX_ENCRYPT_FAIL)
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if (status & TX_UNAVAILABLE_PRIORITY)
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/* bit 0 is unused apparently */
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static void wl1251_tx_packet_cb(struct wl1251 *wl,
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struct tx_result *result)
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struct ieee80211_tx_info *info;
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skb = wl->tx_frames[result->id];
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wl1251_error("SKB for packet %d is NULL", result->id);
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info = IEEE80211_SKB_CB(skb);
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if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
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(result->status == TX_SUCCESS))
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info->flags |= IEEE80211_TX_STAT_ACK;
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info->status.rates[0].count = result->ack_failures + 1;
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wl->stats.retry_count += result->ack_failures;
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* We have to remove our private TX header before pushing
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* the skb back to mac80211.
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frame = skb_pull(skb, sizeof(struct tx_double_buffer_desc));
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if (info->control.hw_key &&
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info->control.hw_key->alg == ALG_TKIP) {
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hdrlen = ieee80211_get_hdrlen_from_skb(skb);
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memmove(frame + WL1251_TKIP_IV_SPACE, frame, hdrlen);
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skb_pull(skb, WL1251_TKIP_IV_SPACE);
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wl1251_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
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result->id, skb, result->ack_failures, result->rate,
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result->status, wl1251_tx_parse_status(result->status));
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ieee80211_tx_status(wl->hw, skb);
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wl->tx_frames[result->id] = NULL;
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if (wl->tx_queue_stopped) {
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wl1251_debug(DEBUG_TX, "cb: queue was stopped");
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skb = skb_dequeue(&wl->tx_queue);
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/* The skb can be NULL because tx_work might have been
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scheduled before the queue was stopped making the
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ret = wl1251_tx_frame(wl, skb);
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/* firmware buffer is still full */
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wl1251_debug(DEBUG_TX, "cb: fw buffer "
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skb_queue_head(&wl->tx_queue, skb);
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} else if (ret < 0) {
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wl1251_debug(DEBUG_TX, "cb: waking queues");
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ieee80211_wake_queues(wl->hw);
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wl->tx_queue_stopped = false;
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/* Called upon reception of a TX complete interrupt */
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void wl1251_tx_complete(struct wl1251 *wl)
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int i, result_index, num_complete = 0;
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struct tx_result result[FW_TX_CMPLT_BLOCK_SIZE], *result_ptr;
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if (unlikely(wl->state != WL1251_STATE_ON))
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/* First we read the result */
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wl1251_mem_read(wl, wl->data_path->tx_complete_addr,
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result, sizeof(result));
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result_index = wl->next_tx_complete;
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for (i = 0; i < ARRAY_SIZE(result); i++) {
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result_ptr = &result[result_index];
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if (result_ptr->done_1 == 1 &&
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result_ptr->done_2 == 1) {
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wl1251_tx_packet_cb(wl, result_ptr);
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result_ptr->done_1 = 0;
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result_ptr->done_2 = 0;
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result_index = (result_index + 1) &
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(FW_TX_CMPLT_BLOCK_SIZE - 1);
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/* Every completed frame needs to be acknowledged */
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* If we've wrapped, we have to clear
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* the results in 2 steps.
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if (result_index > wl->next_tx_complete) {
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/* Only 1 write is needed */
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wl->data_path->tx_complete_addr +
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(wl->next_tx_complete *
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sizeof(struct tx_result)),
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&result[wl->next_tx_complete],
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sizeof(struct tx_result));
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} else if (result_index < wl->next_tx_complete) {
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/* 2 writes are needed */
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wl->data_path->tx_complete_addr +
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(wl->next_tx_complete *
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sizeof(struct tx_result)),
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&result[wl->next_tx_complete],
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(FW_TX_CMPLT_BLOCK_SIZE -
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wl->next_tx_complete) *
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sizeof(struct tx_result));
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wl->data_path->tx_complete_addr,
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FW_TX_CMPLT_BLOCK_SIZE +
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wl->next_tx_complete) *
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sizeof(struct tx_result));
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/* We have to write the whole array */
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wl->data_path->tx_complete_addr,
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FW_TX_CMPLT_BLOCK_SIZE *
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sizeof(struct tx_result));
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wl->next_tx_complete = result_index;
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/* caller must hold wl->mutex */
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void wl1251_tx_flush(struct wl1251 *wl)
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struct ieee80211_tx_info *info;
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/* control->flags = 0; FIXME */
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while ((skb = skb_dequeue(&wl->tx_queue))) {
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info = IEEE80211_SKB_CB(skb);
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wl1251_debug(DEBUG_TX, "flushing skb 0x%p", skb);
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if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS))
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ieee80211_tx_status(wl->hw, skb);
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for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; i++)
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if (wl->tx_frames[i] != NULL) {
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skb = wl->tx_frames[i];
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info = IEEE80211_SKB_CB(skb);
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if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS))
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ieee80211_tx_status(wl->hw, skb);
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wl->tx_frames[i] = NULL;