379 lines
9.6 KiB
C
379 lines
9.6 KiB
C
/*
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* This file is part of wl1271
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*
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* Copyright (C) 2009 Nokia Corporation
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*
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* Contact: Luciano Coelho <luciano.coelho@nokia.com>
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*
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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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*
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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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*
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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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* 02110-1301 USA
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include "wl1271.h"
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#include "wl1271_spi.h"
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#include "wl1271_reg.h"
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#include "wl1271_ps.h"
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#include "wl1271_tx.h"
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static int wl1271_tx_id(struct wl1271 *wl, struct sk_buff *skb)
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{
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int i;
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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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return i;
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}
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return -EBUSY;
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}
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static int wl1271_tx_allocate(struct wl1271 *wl, struct sk_buff *skb, u32 extra)
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{
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struct wl1271_tx_hw_descr *desc;
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u32 total_len = skb->len + sizeof(struct wl1271_tx_hw_descr) + extra;
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u32 total_blocks, excluded;
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int id, ret = -EBUSY;
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/* allocate free identifier for the packet */
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id = wl1271_tx_id(wl, skb);
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if (id < 0)
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return id;
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/* approximate the number of blocks required for this packet
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in the firmware */
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/* FIXME: try to figure out what is done here and make it cleaner */
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total_blocks = (skb->len) >> TX_HW_BLOCK_SHIFT_DIV;
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excluded = (total_blocks << 2) + (skb->len & 0xff) + 34;
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total_blocks += (excluded > 252) ? 2 : 1;
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total_blocks += TX_HW_BLOCK_SPARE;
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if (total_blocks <= wl->tx_blocks_available) {
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desc = (struct wl1271_tx_hw_descr *)skb_push(
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skb, total_len - skb->len);
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desc->extra_mem_blocks = TX_HW_BLOCK_SPARE;
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desc->total_mem_blocks = total_blocks;
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desc->id = id;
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wl->tx_blocks_available -= total_blocks;
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ret = 0;
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wl1271_debug(DEBUG_TX,
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"tx_allocate: size: %d, blocks: %d, id: %d",
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total_len, total_blocks, id);
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} else
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wl->tx_frames[id] = NULL;
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return ret;
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}
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static int wl1271_tx_fill_hdr(struct wl1271 *wl, struct sk_buff *skb,
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u32 extra, struct ieee80211_tx_info *control)
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{
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struct wl1271_tx_hw_descr *desc;
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int pad;
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desc = (struct wl1271_tx_hw_descr *) skb->data;
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/* configure packet life time */
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desc->start_time = jiffies_to_usecs(jiffies) - wl->time_offset;
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desc->life_time = TX_HW_MGMT_PKT_LIFETIME_TU;
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/* configure the tx attributes */
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desc->tx_attr = wl->session_counter << TX_HW_ATTR_OFST_SESSION_COUNTER;
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/* FIXME: do we know the packet priority? can we identify mgmt
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packets, and use max prio for them at least? */
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desc->tid = 0;
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desc->aid = TX_HW_DEFAULT_AID;
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desc->reserved = 0;
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/* align the length (and store in terms of words) */
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pad = WL1271_TX_ALIGN(skb->len);
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desc->length = pad >> 2;
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/* calculate number of padding bytes */
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pad = pad - skb->len;
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desc->tx_attr |= pad << TX_HW_ATTR_OFST_LAST_WORD_PAD;
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wl1271_debug(DEBUG_TX, "tx_fill_hdr: pad: %d", pad);
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return 0;
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}
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static int wl1271_tx_send_packet(struct wl1271 *wl, struct sk_buff *skb,
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struct ieee80211_tx_info *control)
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{
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struct wl1271_tx_hw_descr *desc;
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int len;
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/* FIXME: 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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*/
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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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wl1271_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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} else {
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wl1271_info("No handler, fixme!");
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return -EINVAL;
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}
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}
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len = WL1271_TX_ALIGN(skb->len);
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/* perform a fixed address block write with the packet */
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wl1271_spi_reg_write(wl, WL1271_SLV_MEM_DATA, skb->data, len, true);
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/* write packet new counter into the write access register */
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wl->tx_packets_count++;
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wl1271_reg_write32(wl, WL1271_HOST_WR_ACCESS, wl->tx_packets_count);
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desc = (struct wl1271_tx_hw_descr *) skb->data;
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wl1271_debug(DEBUG_TX, "tx id %u skb 0x%p payload %u (%u words)",
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desc->id, skb, len, desc->length);
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return 0;
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}
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/* caller must hold wl->mutex */
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static int wl1271_tx_frame(struct wl1271 *wl, struct sk_buff *skb)
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{
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struct ieee80211_tx_info *info;
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u32 extra = 0;
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int ret = 0;
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u8 idx;
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if (!skb)
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return -EINVAL;
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info = IEEE80211_SKB_CB(skb);
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if (info->control.hw_key &&
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info->control.hw_key->alg == ALG_TKIP)
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extra = WL1271_TKIP_IV_SPACE;
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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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/* FIXME: do we have to do this if we're not using WEP? */
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if (unlikely(wl->default_key != idx)) {
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ret = wl1271_cmd_set_default_wep_key(wl, idx);
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if (ret < 0)
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return ret;
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}
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}
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ret = wl1271_tx_allocate(wl, skb, extra);
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if (ret < 0)
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return ret;
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ret = wl1271_tx_fill_hdr(wl, skb, extra, info);
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if (ret < 0)
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return ret;
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ret = wl1271_tx_send_packet(wl, skb, info);
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if (ret < 0)
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return ret;
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return ret;
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}
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void wl1271_tx_work(struct work_struct *work)
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{
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struct wl1271 *wl = container_of(work, struct wl1271, tx_work);
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struct sk_buff *skb;
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bool woken_up = false;
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int ret;
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mutex_lock(&wl->mutex);
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if (unlikely(wl->state == WL1271_STATE_OFF))
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goto out;
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while ((skb = skb_dequeue(&wl->tx_queue))) {
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if (!woken_up) {
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ret = wl1271_ps_elp_wakeup(wl, false);
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if (ret < 0)
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goto out;
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woken_up = true;
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}
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ret = wl1271_tx_frame(wl, skb);
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if (ret == -EBUSY) {
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/* firmware buffer is full, stop queues */
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wl1271_debug(DEBUG_TX, "tx_work: fw buffer full, "
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"stop queues");
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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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goto out;
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} else if (ret < 0) {
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dev_kfree_skb(skb);
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goto out;
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} else if (wl->tx_queue_stopped) {
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/* firmware buffer has space, restart queues */
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wl1271_debug(DEBUG_TX,
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"complete_packet: waking queues");
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ieee80211_wake_queues(wl->hw);
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wl->tx_queue_stopped = false;
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}
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}
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out:
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if (woken_up)
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wl1271_ps_elp_sleep(wl);
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mutex_unlock(&wl->mutex);
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}
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static void wl1271_tx_complete_packet(struct wl1271 *wl,
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struct wl1271_tx_hw_res_descr *result)
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{
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struct ieee80211_tx_info *info;
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struct sk_buff *skb;
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u32 header_len;
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int id = result->id;
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/* check for id legality */
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if (id >= TX_HW_RESULT_QUEUE_LEN || wl->tx_frames[id] == NULL) {
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wl1271_warning("TX result illegal id: %d", id);
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return;
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}
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skb = wl->tx_frames[id];
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info = IEEE80211_SKB_CB(skb);
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/* update packet status */
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if (!(info->flags & IEEE80211_TX_CTL_NO_ACK)) {
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if (result->status == TX_SUCCESS)
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info->flags |= IEEE80211_TX_STAT_ACK;
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if (result->status & TX_RETRY_EXCEEDED) {
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/* FIXME */
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/* info->status.excessive_retries = 1; */
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wl->stats.excessive_retries++;
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}
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}
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/* FIXME */
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/* info->status.retry_count = result->ack_failures; */
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wl->stats.retry_count += result->ack_failures;
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/* get header len */
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if (info->control.hw_key &&
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info->control.hw_key->alg == ALG_TKIP)
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header_len = WL1271_TKIP_IV_SPACE +
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sizeof(struct wl1271_tx_hw_descr);
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else
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header_len = sizeof(struct wl1271_tx_hw_descr);
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wl1271_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
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" status 0x%x",
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result->id, skb, result->ack_failures,
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result->rate_class_index, result->status);
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/* remove private header from packet */
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skb_pull(skb, header_len);
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/* return the packet to the stack */
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ieee80211_tx_status(wl->hw, skb);
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wl->tx_frames[result->id] = NULL;
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}
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/* Called upon reception of a TX complete interrupt */
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void wl1271_tx_complete(struct wl1271 *wl, u32 count)
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{
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struct wl1271_acx_mem_map *memmap =
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(struct wl1271_acx_mem_map *)wl->target_mem_map;
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u32 i;
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wl1271_debug(DEBUG_TX, "tx_complete received, packets: %d", count);
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/* read the tx results from the chipset */
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wl1271_spi_mem_read(wl, memmap->tx_result,
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wl->tx_res_if, sizeof(*wl->tx_res_if));
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/* verify that the result buffer is not getting overrun */
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if (count > TX_HW_RESULT_QUEUE_LEN) {
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wl1271_warning("TX result overflow from chipset: %d", count);
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count = TX_HW_RESULT_QUEUE_LEN;
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}
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/* process the results */
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for (i = 0; i < count; i++) {
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struct wl1271_tx_hw_res_descr *result;
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u8 offset = wl->tx_results_count & TX_HW_RESULT_QUEUE_LEN_MASK;
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/* process the packet */
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result = &(wl->tx_res_if->tx_results_queue[offset]);
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wl1271_tx_complete_packet(wl, result);
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wl->tx_results_count++;
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}
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/* write host counter to chipset (to ack) */
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wl1271_mem_write32(wl, memmap->tx_result +
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offsetof(struct wl1271_tx_hw_res_if,
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tx_result_host_counter),
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wl->tx_res_if->tx_result_fw_counter);
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}
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/* caller must hold wl->mutex */
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void wl1271_tx_flush(struct wl1271 *wl)
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{
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int i;
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struct sk_buff *skb;
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struct ieee80211_tx_info *info;
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/* TX failure */
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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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wl1271_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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continue;
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ieee80211_tx_status(wl->hw, skb);
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}
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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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continue;
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ieee80211_tx_status(wl->hw, skb);
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wl->tx_frames[i] = NULL;
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}
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}
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