/******************************************************************************
*
* Copyright(c) 2003 - 2008 Intel Corporation. All rights reserved.
*
* Portions of this file are derived from the ipw3945 project, as well
* as portions of the ieee80211 subsystem header files.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
*
* The full GNU General Public License is included in this distribution in the
* file called LICENSE.
*
* Contact Information:
* James P. Ketrenos <ipw2100-admin@linux.intel.com>
* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
*
*****************************************************************************/
#include <linux/etherdevice.h>
#include <net/mac80211.h>
#include "iwl-eeprom.h"
#include "iwl-dev.h"
#include "iwl-core.h"
#include "iwl-sta.h"
#include "iwl-io.h"
#include "iwl-helpers.h"
/**
* iwl_hw_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr]
*
* Does NOT advance any TFD circular buffer read/write indexes
* Does NOT free the TFD itself (which is within circular buffer)
*/
int iwl_hw_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq)
{
struct iwl_tfd_frame *bd_tmp = (struct iwl_tfd_frame *)&txq->bd[0];
struct iwl_tfd_frame *bd = &bd_tmp[txq->q.read_ptr];
struct pci_dev *dev = priv->pci_dev;
int i;
int counter = 0;
int index, is_odd;
/* Host command buffers stay mapped in memory, nothing to clean */
if (txq->q.id == IWL_CMD_QUEUE_NUM)
return 0;
/* Sanity check on number of chunks */
counter = IWL_GET_BITS(*bd, num_tbs);
if (counter > MAX_NUM_OF_TBS) {
IWL_ERROR("Too many chunks: %i\n", counter);
/* @todo issue fatal error, it is quite serious situation */
return 0;
}
/* Unmap chunks, if any.
* TFD info for odd chunks is different format than for even chunks. */
for (i = 0; i < counter; i++) {
index = i / 2;
is_odd = i & 0x1;
if (is_odd)
pci_unmap_single(
dev,
IWL_GET_BITS(bd->pa[index], tb2_addr_lo16) |
(IWL_GET_BITS(bd->pa[index],
tb2_addr_hi20) << 16),
IWL_GET_BITS(bd->pa[index], tb2_len),
PCI_DMA_TODEVICE);
else if (i > 0)
pci_unmap_single(dev,
le32_to_cpu(bd->pa[index].tb1_addr),
IWL_GET_BITS(bd->pa[index], tb1_len),
PCI_DMA_TODEVICE);
/* Free SKB, if any, for this chunk */
if (txq->txb[txq->q.read_ptr].skb[i]) {
struct sk_buff *skb = txq->txb[txq->q.read_ptr].skb[i];
dev_kfree_skb(skb);
txq->txb[txq->q.read_ptr].skb[i] = NULL;
}
}
return 0;
}
EXPORT_SYMBOL(iwl_hw_txq_free_tfd);
int iwl_hw_txq_attach_buf_to_tfd(struct iwl_priv *priv, void *ptr,
dma_addr_t addr, u16 len)
{
int index, is_odd;
struct iwl_tfd_frame *tfd = ptr;
u32 num_tbs = IWL_GET_BITS(*tfd, num_tbs);
/* Each TFD can point to a maximum 20 Tx buffers */
if ((num_tbs >= MAX_NUM_OF_TBS) || (num_tbs < 0)) {
IWL_ERROR("Error can not send more than %d chunks\n",
MAX_NUM_OF_TBS);
return -EINVAL;
}
index = num_tbs / 2;
is_odd = num_tbs & 0x1;
if (!is_odd) {
tfd->pa[index].tb1_addr = cpu_to_le32(addr);
IWL_SET_BITS(tfd->pa[index], tb1_addr_hi,
iwl_get_dma_hi_address(addr));
IWL_SET_BITS(tfd->pa[index], tb1_len, len);
} else {
IWL_SET_BITS(tfd->pa[index], tb2_addr_lo16,
(u32) (addr & 0xffff));
IWL_SET_BITS(tfd->pa[index], tb2_addr_hi20, addr >> 16);
IWL_SET_BITS(tfd->pa[index], tb2_len, len);
}
IWL_SET_BITS(*tfd, num_tbs, num_tbs + 1);
return 0;
}
EXPORT_SYMBOL(iwl_hw_txq_attach_buf_to_tfd);
/**
* iwl_txq_update_write_ptr - Send new write index to hardware
*/
int iwl_txq_update_write_ptr(struct iwl_priv *priv, struct iwl_tx_queue *txq)
{
u32 reg = 0;
int ret = 0;
int txq_id = txq->q.id;
if (txq->need_update == 0)
return ret;
/* if we're trying to save power */
if (test_bit(STATUS_POWER_PMI, &priv->status)) {
/* wake up nic if it's powered down ...
* uCode will wake up, and interrupt us again, so next
* time we'll skip this part. */
reg = iwl_read32(priv, CSR_UCODE_DRV_GP1);
if (reg & CSR_UCODE_DRV_GP1_BIT_MAC_SLEEP) {
IWL_DEBUG_INFO("Requesting wakeup, GP1 = 0x%x\n", reg);
iwl_set_bit(priv, CSR_GP_CNTRL,
CSR_GP_CNTRL_REG_FLAG_MAC_ACCESS_REQ);
return ret;
}
/* restore this queue's parameters in nic hardware. */
ret = iwl_grab_nic_access(priv);
if (ret)
return ret;
iwl_write_direct32(priv, HBUS_TARG_WRPTR,
txq->q.write_ptr | (txq_id << 8));
iwl_release_nic_access(priv);
/* else not in power-save mode, uCode will never sleep when we're
* trying to tx (during RFKILL, we're not trying to tx). */
} else
iwl_write32(priv, HBUS_TARG_WRPTR,
txq->q.write_ptr | (txq_id << 8));
txq->need_update = 0;
return ret;
}
EXPORT_SYMBOL(iwl_txq_update_write_ptr);
/**
* iwl_tx_queue_free - Deallocate DMA queue.
* @txq: Transmit queue to deallocate.
*
* Empty queue by removing and destroying all BD's.
* Free all buffers.
* 0-fill, but do not free "txq" descriptor structure.
*/
static void iwl_tx_queue_free(struct iwl_priv *priv, struct iwl_tx_queue *txq)
{
struct iwl_queue *q = &txq->q;
struct pci_dev *dev = priv->pci_dev;
int len;
if (q->n_bd == 0)
return;
/* first, empty all BD's */
for (; q->write_ptr != q->read_ptr;
q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd))
iwl_hw_txq_free_tfd(priv, txq);
len = sizeof(struct iwl_cmd) * q->n_window;
if (q->id == IWL_CMD_QUEUE_NUM)
len += IWL_MAX_SCAN_SIZE;
/* De-alloc array of command/tx buffers */
pci_free_consistent(dev, len, txq->cmd, txq->dma_addr_cmd);
/* De-alloc circular buffer of TFDs */
if (txq->q.n_bd)
pci_free_consistent(dev, sizeof(struct iwl_tfd_frame) *
txq->q.n_bd, txq->bd, txq->q.dma_addr);
/* De-alloc array of per-TFD driver data */
kfree(txq->txb);
txq->txb = NULL;
/* 0-fill queue descriptor structure */
memset(txq, 0, sizeof(*txq));
}
/*************** DMA-QUEUE-GENERAL-FUNCTIONS *****
* DMA services
*
* Theory of operation
*
* A Tx or Rx queue resides in host DRAM, and is comprised of a circular buffer
* of buffer descriptors, each of which points to one or more data buffers for
* the device to read from or fill. Driver and device exchange status of each
* queue via "read" and "write" pointers. Driver keeps minimum of 2 empty
* entries in each circular buffer, to protect against confusing empty and full
* queue states.
*
* The device reads or writes the data in the queues via the device's several
* DMA/FIFO channels. Each queue is mapped to a single DMA channel.
*
* For Tx queue, there are low mark and high mark limits. If, after queuing
* the packet for Tx, free space become < low mark, Tx queue stopped. When
* reclaiming packets (on 'tx done IRQ), if free space become > high mark,
* Tx queue resumed.
*
* See more detailed info in iwl-4965-hw.h.
***************************************************/
int iwl_queue_space(const struct iwl_queue *q)
{
int s = q->read_ptr - q->write_ptr;
if (q->read_ptr > q->write_ptr)
s -= q->n_bd;
if (s <= 0)
s += q->n_window;
/* keep some reserve to not confuse empty and full situations */
s -= 2;
if (s < 0)
s = 0;
return s;
}
EXPORT_SYMBOL(iwl_queue_space);
/**
* iwl_hw_txq_ctx_free - Free TXQ Context
*
* Destroy all TX DMA queues and structures
*/
void iwl_hw_txq_ctx_free(struct iwl_priv *priv)
{
int txq_id;
/* Tx queues */
for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
iwl_tx_queue_free(priv, &priv->txq[txq_id]);
/* Keep-warm buffer */
iwl_kw_free(priv);
}
EXPORT_SYMBOL(iwl_hw_txq_ctx_free);
/**
* iwl_queue_init - Initialize queue's high/low-water and read/write indexes
*/
static int iwl_queue_init(struct iwl_priv *priv, struct iwl_queue *q,
int count, int slots_num, u32 id)
{
q->n_bd = count;
q->n_window = slots_num;
q->id = id;
/* count must be power-of-two size, otherwise iwl_queue_inc_wrap
* and iwl_queue_dec_wrap are broken. */
BUG_ON(!is_power_of_2(count));
/* slots_num must be power-of-two size, otherwise
* get_cmd_index is broken. */
BUG_ON(!is_power_of_2(slots_num));
q->low_mark = q->n_window / 4;
if (q->low_mark < 4)
q->low_mark = 4;
q->high_mark = q->n_window / 8;
if (q->high_mark < 2)
q->high_mark = 2;
q->write_ptr = q->read_ptr = 0;
return 0;
}
/**
* iwl_tx_queue_alloc - Alloc driver data and TFD CB for one Tx/cmd queue
*/
static int iwl_tx_queue_alloc(struct iwl_priv *priv,
struct iwl_tx_queue *txq, u32 id)
{
struct pci_dev *dev = priv->pci_dev;
/* Driver private data, only for Tx (not command) queues,
* not shared with device. */
if (id != IWL_CMD_QUEUE_NUM) {
txq->txb = kmalloc(sizeof(txq->txb[0]) *
TFD_QUEUE_SIZE_MAX, GFP_KERNEL);
if (!txq->txb) {
IWL_ERROR("kmalloc for auxiliary BD "
"structures failed\n");
goto error;
}
} else
txq->txb = NULL;
/* Circular buffer of transmit frame descriptors (TFDs),
* shared with device */
txq->bd = pci_alloc_consistent(dev,
sizeof(txq->bd[0]) * TFD_QUEUE_SIZE_MAX,
&txq->q.dma_addr);
if (!txq->bd) {
IWL_ERROR("pci_alloc_consistent(%zd) failed\n",
sizeof(txq->bd[0]) * TFD_QUEUE_SIZE_MAX);
goto error;
}
txq->q.id = id;
return 0;
error:
kfree(txq->txb);
txq->txb = NULL;
return -ENOMEM;
}
/*
* Tell nic where to find circular buffer of Tx Frame Descriptors for
* given Tx queue, and enable the DMA channel used for that queue.
*
* 4965 supports up to 16 Tx queues in DRAM, mapped to up to 8 Tx DMA
* channels supported in hardware.
*/
static int iwl_hw_tx_queue_init(struct iwl_priv *priv,
struct iwl_tx_queue *txq)
{
int rc;
unsigned long flags;
int txq_id = txq->q.id;
spin_lock_irqsave(&priv->lock, flags);
rc = iwl_grab_nic_access(priv);
if (rc) {
spin_unlock_irqrestore(&priv->lock, flags);
return rc;
}
/* Circular buffer (TFD queue in DRAM) physical base address */
iwl_write_direct32(priv, FH_MEM_CBBC_QUEUE(txq_id),
txq->q.dma_addr >> 8);
/* Enable DMA channel, using same id as for TFD queue */
iwl_write_direct32(
priv, FH_TCSR_CHNL_TX_CONFIG_REG(txq_id),
FH_TCSR_TX_CONFIG_REG_VAL_DMA_CHNL_ENABLE |
FH_TCSR_TX_CONFIG_REG_VAL_DMA_CREDIT_ENABLE_VAL);
iwl_release_nic_access(priv);
spin_unlock_irqrestore(&priv->lock, flags);
return 0;
}
/**
* iwl_tx_queue_init - Allocate and initialize one tx/cmd queue
*/
static int iwl_tx_queue_init(struct iwl_priv *priv,
struct iwl_tx_queue *txq,
int slots_num, u32 txq_id)
{
struct pci_dev *dev = priv->pci_dev;
int len;
int rc = 0;
/*
* Alloc buffer array for commands (Tx or other types of commands).
* For the command queue (#4), allocate command space + one big
* command for scan, since scan command is very huge; the system will
* not have two scans at the same time, so only one is needed.
* For normal Tx queues (all other queues), no super-size command
* space is needed.
*/
len = sizeof(struct iwl_cmd) * slots_num;
if (txq_id == IWL_CMD_QUEUE_NUM)
len += IWL_MAX_SCAN_SIZE;
txq->cmd = pci_alloc_consistent(dev, len, &txq->dma_addr_cmd);
if (!txq->cmd)
return -ENOMEM;
/* Alloc driver data array and TFD circular buffer */
rc = iwl_tx_queue_alloc(priv, txq, txq_id);
if (rc) {
pci_free_consistent(dev, len, txq->cmd, txq->dma_addr_cmd);
return -ENOMEM;
}
txq->need_update = 0;
/* TFD_QUEUE_SIZE_MAX must be power-of-two size, otherwise
* iwl_queue_inc_wrap and iwl_queue_dec_wrap are broken. */
BUILD_BUG_ON(TFD_QUEUE_SIZE_MAX & (TFD_QUEUE_SIZE_MAX - 1));
/* Initialize queue's high/low-water marks, and head/tail indexes */
iwl_queue_init(priv, &txq->q, TFD_QUEUE_SIZE_MAX, slots_num, txq_id);
/* Tell device where to find queue */
iwl_hw_tx_queue_init(priv, txq);
return 0;
}
/**
* iwl_txq_ctx_reset - Reset TX queue context
* Destroys all DMA structures and initialise them again
*
* @param priv
* @return error code
*/
int iwl_txq_ctx_reset(struct iwl_priv *priv)
{
int ret = 0;
int txq_id, slots_num;
iwl_kw_free(priv);
/* Free all tx/cmd queues and keep-warm buffer */
iwl_hw_txq_ctx_free(priv);
/* Alloc keep-warm buffer */
ret = iwl_kw_alloc(priv);
if (ret) {
IWL_ERROR("Keep Warm allocation failed");
goto error_kw;
}
/* Turn off all Tx DMA fifos */
ret = priv->cfg->ops->lib->disable_tx_fifo(priv);
if (unlikely(ret))
goto error_reset;
/* Tell nic where to find the keep-warm buffer */
ret = iwl_kw_init(priv);
if (ret) {
IWL_ERROR("kw_init failed\n");
goto error_reset;
}
/* Alloc and init all (default 16) Tx queues,
* including the command queue (#4) */
for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++) {
slots_num = (txq_id == IWL_CMD_QUEUE_NUM) ?
TFD_CMD_SLOTS : TFD_TX_CMD_SLOTS;
ret = iwl_tx_queue_init(priv, &priv->txq[txq_id], slots_num,
txq_id);
if (ret) {
IWL_ERROR("Tx %d queue init failed\n", txq_id);
goto error;
}
}
return ret;
error:
iwl_hw_txq_ctx_free(priv);
error_reset:
iwl_kw_free(priv);
error_kw:
return ret;
}
/*
* handle build REPLY_TX command notification.
*/
static void iwl_tx_cmd_build_basic(struct iwl_priv *priv,
struct iwl_tx_cmd *tx_cmd,
struct ieee80211_tx_control *ctrl,
struct ieee80211_hdr *hdr,
int is_unicast, u8 std_id)
{
u16 fc = le16_to_cpu(hdr->frame_control);
__le32 tx_flags = tx_cmd->tx_flags;
tx_cmd->stop_time.life_time = TX_CMD_LIFE_TIME_INFINITE;
if (!(ctrl->flags & IEEE80211_TXCTL_NO_ACK)) {
tx_flags |= TX_CMD_FLG_ACK_MSK;
if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT)
tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
if (ieee80211_is_probe_response(fc) &&
!(le16_to_cpu(hdr->seq_ctrl) & 0xf))
tx_flags |= TX_CMD_FLG_TSF_MSK;
} else {
tx_flags &= (~TX_CMD_FLG_ACK_MSK);
tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
}
if (ieee80211_is_back_request(fc))
tx_flags |= TX_CMD_FLG_ACK_MSK | TX_CMD_FLG_IMM_BA_RSP_MASK;
tx_cmd->sta_id = std_id;
if (ieee80211_get_morefrag(hdr))
tx_flags |= TX_CMD_FLG_MORE_FRAG_MSK;
if (ieee80211_is_qos_data(fc)) {
u8 *qc = ieee80211_get_qos_ctrl(hdr, ieee80211_get_hdrlen(fc));
tx_cmd->tid_tspec = qc[0] & 0xf;
tx_flags &= ~TX_CMD_FLG_SEQ_CTL_MSK;
} else {
tx_flags |= TX_CMD_FLG_SEQ_CTL_MSK;
}
if (ctrl->flags & IEEE80211_TXCTL_USE_RTS_CTS) {
tx_flags |= TX_CMD_FLG_RTS_MSK;
tx_flags &= ~TX_CMD_FLG_CTS_MSK;
} else if (ctrl->flags & IEEE80211_TXCTL_USE_CTS_PROTECT) {
tx_flags &= ~TX_CMD_FLG_RTS_MSK;
tx_flags |= TX_CMD_FLG_CTS_MSK;
}
if ((tx_flags & TX_CMD_FLG_RTS_MSK) || (tx_flags & TX_CMD_FLG_CTS_MSK))
tx_flags |= TX_CMD_FLG_FULL_TXOP_PROT_MSK;
tx_flags &= ~(TX_CMD_FLG_ANT_SEL_MSK);
if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_MGMT) {
if ((fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_ASSOC_REQ ||
(fc & IEEE80211_FCTL_STYPE) == IEEE80211_STYPE_REASSOC_REQ)
tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(3);
else
tx_cmd->timeout.pm_frame_timeout = cpu_to_le16(2);
} else {
tx_cmd->timeout.pm_frame_timeout = 0;
}
tx_cmd->driver_txop = 0;
tx_cmd->tx_flags = tx_flags;
tx_cmd->next_frame_len = 0;
}
#define RTS_HCCA_RETRY_LIMIT 3
#define RTS_DFAULT_RETRY_LIMIT 60
static void iwl_tx_cmd_build_rate(struct iwl_priv *priv,
struct iwl_tx_cmd *tx_cmd,
struct ieee80211_tx_control *ctrl,
u16 fc, int sta_id,
int is_hcca)
{
u8 rts_retry_limit = 0;
u8 data_retry_limit = 0;
u8 rate_plcp;
u16 rate_flags = 0;
int rate_idx = min(ctrl->tx_rate->hw_value & 0xffff, IWL_RATE_COUNT - 1);
rate_plcp = iwl_rates[rate_idx].plcp;
rts_retry_limit = (is_hcca) ?
RTS_HCCA_RETRY_LIMIT : RTS_DFAULT_RETRY_LIMIT;
if ((rate_idx >= IWL_FIRST_CCK_RATE) && (rate_idx <= IWL_LAST_CCK_RATE))
rate_flags |= RATE_MCS_CCK_MSK;
if (ieee80211_is_probe_response(fc)) {
data_retry_limit = 3;
if (data_retry_limit < rts_retry_limit)
rts_retry_limit = data_retry_limit;
} else
data_retry_limit = IWL_DEFAULT_TX_RETRY;
if (priv->data_retry_limit != -1)
data_retry_limit = priv->data_retry_limit;
if (ieee80211_is_data(fc)) {
tx_cmd->initial_rate_index = 0;
tx_cmd->tx_flags |= TX_CMD_FLG_STA_RATE_MSK;
} else {
switch (fc & IEEE80211_FCTL_STYPE) {
case IEEE80211_STYPE_AUTH:
case IEEE80211_STYPE_DEAUTH:
case IEEE80211_STYPE_ASSOC_REQ:
case IEEE80211_STYPE_REASSOC_REQ:
if (tx_cmd->tx_flags & TX_CMD_FLG_RTS_MSK) {
tx_cmd->tx_flags &= ~TX_CMD_FLG_RTS_MSK;
tx_cmd->tx_flags |= TX_CMD_FLG_CTS_MSK;
}
break;
default:
break;
}
/* Alternate between antenna A and B for successive frames */
if (priv->use_ant_b_for_management_frame) {
priv->use_ant_b_for_management_frame = 0;
rate_flags |= RATE_MCS_ANT_B_MSK;
} else {
priv->use_ant_b_for_management_frame = 1;
rate_flags |= RATE_MCS_ANT_A_MSK;
}
}
tx_cmd->rts_retry_limit = rts_retry_limit;
tx_cmd->data_retry_limit = data_retry_limit;
tx_cmd->rate_n_flags = iwl4965_hw_set_rate_n_flags(rate_plcp, rate_flags);
}
static void iwl_tx_cmd_build_hwcrypto(struct iwl_priv *priv,
struct ieee80211_tx_control *ctl,
struct iwl_tx_cmd *tx_cmd,
struct sk_buff *skb_frag,
int sta_id)
{
struct ieee80211_key_conf *keyconf = ctl->hw_key;
switch (keyconf->alg) {
case ALG_CCMP:
tx_cmd->sec_ctl = TX_CMD_SEC_CCM;
memcpy(tx_cmd->key, keyconf->key, keyconf->keylen);
if (ctl->flags & IEEE80211_TXCTL_AMPDU)
tx_cmd->tx_flags |= TX_CMD_FLG_AGG_CCMP_MSK;
IWL_DEBUG_TX("tx_cmd with aes hwcrypto\n");
break;
case ALG_TKIP:
tx_cmd->sec_ctl = TX_CMD_SEC_TKIP;
ieee80211_get_tkip_key(keyconf, skb_frag,
IEEE80211_TKIP_P2_KEY, tx_cmd->key);
IWL_DEBUG_TX("tx_cmd with tkip hwcrypto\n");
break;
case ALG_WEP:
tx_cmd->sec_ctl |= (TX_CMD_SEC_WEP |
(keyconf->keyidx & TX_CMD_SEC_MSK) << TX_CMD_SEC_SHIFT);
if (keyconf->keylen == WEP_KEY_LEN_128)
tx_cmd->sec_ctl |= TX_CMD_SEC_KEY128;
memcpy(&tx_cmd->key[3], keyconf->key, keyconf->keylen);
IWL_DEBUG_TX("Configuring packet for WEP encryption "
"with key %d\n", keyconf->keyidx);
break;
default:
printk(KERN_ERR "Unknown encode alg %d\n", keyconf->alg);
break;
}
}
static void iwl_update_tx_stats(struct iwl_priv *priv, u16 fc, u16 len)
{
/* 0 - mgmt, 1 - cnt, 2 - data */
int idx = (fc & IEEE80211_FCTL_FTYPE) >> 2;
priv->tx_stats[idx].cnt++;
priv->tx_stats[idx].bytes += len;
}
/*
* start REPLY_TX command process
*/
int iwl_tx_skb(struct iwl_priv *priv,
struct sk_buff *skb, struct ieee80211_tx_control *ctl)
{
struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
struct iwl_tfd_frame *tfd;
u32 *control_flags;
int txq_id = ctl->queue;
struct iwl_tx_queue *txq = NULL;
struct iwl_queue *q = NULL;
dma_addr_t phys_addr;
dma_addr_t txcmd_phys;
dma_addr_t scratch_phys;
struct iwl_cmd *out_cmd = NULL;
struct iwl_tx_cmd *tx_cmd;
u16 len, idx, len_org;
u16 seq_number = 0;
u8 id, hdr_len, unicast;
u8 sta_id;
u16 fc;
u8 wait_write_ptr = 0;
u8 tid = 0;
u8 *qc = NULL;
unsigned long flags;
int ret;
spin_lock_irqsave(&priv->lock, flags);
if (iwl_is_rfkill(priv)) {
IWL_DEBUG_DROP("Dropping - RF KILL\n");
goto drop_unlock;
}
if (!priv->vif) {
IWL_DEBUG_DROP("Dropping - !priv->vif\n");
goto drop_unlock;
}
if ((ctl->tx_rate->hw_value & 0xFF) == IWL_INVALID_RATE) {
IWL_ERROR("ERROR: No TX rate available.\n");
goto drop_unlock;
}
unicast = !is_multicast_ether_addr(hdr->addr1);
id = 0;
fc = le16_to_cpu(hdr->frame_control);
#ifdef CONFIG_IWLWIFI_DEBUG
if (ieee80211_is_auth(fc))
IWL_DEBUG_TX("Sending AUTH frame\n");
else if (ieee80211_is_assoc_request(fc))
IWL_DEBUG_TX("Sending ASSOC frame\n");
else if (ieee80211_is_reassoc_request(fc))
IWL_DEBUG_TX("Sending REASSOC frame\n");
#endif
/* drop all data frame if we are not associated */
if (((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA) &&
(!iwl_is_associated(priv) ||
((priv->iw_mode == IEEE80211_IF_TYPE_STA) && !priv->assoc_id) ||
!priv->assoc_station_added)) {
IWL_DEBUG_DROP("Dropping - !iwl_is_associated\n");
goto drop_unlock;
}
spin_unlock_irqrestore(&priv->lock, flags);
hdr_len = ieee80211_get_hdrlen(fc);
/* Find (or create) index into station table for destination station */
sta_id = iwl_get_sta_id(priv, hdr);
if (sta_id == IWL_INVALID_STATION) {
DECLARE_MAC_BUF(mac);
IWL_DEBUG_DROP("Dropping - INVALID STATION: %s\n",
print_mac(mac, hdr->addr1));
goto drop;
}
IWL_DEBUG_TX("station Id %d\n", sta_id);
if (ieee80211_is_qos_data(fc)) {
qc = ieee80211_get_qos_ctrl(hdr, hdr_len);
tid = qc[0] & 0xf;
seq_number = priv->stations[sta_id].tid[tid].seq_number &
IEEE80211_SCTL_SEQ;
hdr->seq_ctrl = cpu_to_le16(seq_number) |
(hdr->seq_ctrl &
__constant_cpu_to_le16(IEEE80211_SCTL_FRAG));
seq_number += 0x10;
#ifdef CONFIG_IWL4965_HT
/* aggregation is on for this <sta,tid> */
if (ctl->flags & IEEE80211_TXCTL_AMPDU)
txq_id = priv->stations[sta_id].tid[tid].agg.txq_id;
priv->stations[sta_id].tid[tid].tfds_in_queue++;
#endif /* CONFIG_IWL4965_HT */
}
/* Descriptor for chosen Tx queue */
txq = &priv->txq[txq_id];
q = &txq->q;
spin_lock_irqsave(&priv->lock, flags);
/* Set up first empty TFD within this queue's circular TFD buffer */
tfd = &txq->bd[q->write_ptr];
memset(tfd, 0, sizeof(*tfd));
control_flags = (u32 *) tfd;
idx = get_cmd_index(q, q->write_ptr, 0);
/* Set up driver data for this TFD */
memset(&(txq->txb[q->write_ptr]), 0, sizeof(struct iwl_tx_info));
txq->txb[q->write_ptr].skb[0] = skb;
memcpy(&(txq->txb[q->write_ptr].status.control),
ctl, sizeof(struct ieee80211_tx_control));
/* Set up first empty entry in queue's array of Tx/cmd buffers */
out_cmd = &txq->cmd[idx];
tx_cmd = &out_cmd->cmd.tx;
memset(&out_cmd->hdr, 0, sizeof(out_cmd->hdr));
memset(tx_cmd, 0, sizeof(struct iwl_tx_cmd));
/*
* Set up the Tx-command (not MAC!) header.
* Store the chosen Tx queue and TFD index within the sequence field;
* after Tx, uCode's Tx response will return this value so driver can
* locate the frame within the tx queue and do post-tx processing.
*/
out_cmd->hdr.cmd = REPLY_TX;
out_cmd->hdr.sequence = cpu_to_le16((u16)(QUEUE_TO_SEQ(txq_id) |
INDEX_TO_SEQ(q->write_ptr)));
/* Copy MAC header from skb into command buffer */
memcpy(tx_cmd->hdr, hdr, hdr_len);
/*
* Use the first empty entry in this queue's command buffer array
* to contain the Tx command and MAC header concatenated together
* (payload data will be in another buffer).
* Size of this varies, due to varying MAC header length.
* If end is not dword aligned, we'll have 2 extra bytes at the end
* of the MAC header (device reads on dword boundaries).
* We'll tell device about this padding later.
*/
len = sizeof(struct iwl_tx_cmd) +
sizeof(struct iwl_cmd_header) + hdr_len;
len_org = len;
len = (len + 3) & ~3;
if (len_org != len)
len_org = 1;
else
len_org = 0;
/* Physical address of this Tx command's header (not MAC header!),
* within command buffer array. */
txcmd_phys = txq->dma_addr_cmd + sizeof(struct iwl_cmd) * idx +
offsetof(struct iwl_cmd, hdr);
/* Add buffer containing Tx command and MAC(!) header to TFD's
* first entry */
iwl_hw_txq_attach_buf_to_tfd(priv, tfd, txcmd_phys, len);
if (!(ctl->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT))
iwl_tx_cmd_build_hwcrypto(priv, ctl, tx_cmd, skb, sta_id);
/* Set up TFD's 2nd entry to point directly to remainder of skb,
* if any (802.11 null frames have no payload). */
len = skb->len - hdr_len;
if (len) {
phys_addr = pci_map_single(priv->pci_dev, skb->data + hdr_len,
len, PCI_DMA_TODEVICE);
iwl_hw_txq_attach_buf_to_tfd(priv, tfd, phys_addr, len);
}
/* Tell NIC about any 2-byte padding after MAC header */
if (len_org)
tx_cmd->tx_flags |= TX_CMD_FLG_MH_PAD_MSK;
/* Total # bytes to be transmitted */
len = (u16)skb->len;
tx_cmd->len = cpu_to_le16(len);
/* TODO need this for burst mode later on */
iwl_tx_cmd_build_basic(priv, tx_cmd, ctl, hdr, unicast, sta_id);
/* set is_hcca to 0; it probably will never be implemented */
iwl_tx_cmd_build_rate(priv, tx_cmd, ctl, fc, sta_id, 0);
iwl_update_tx_stats(priv, fc, len);
scratch_phys = txcmd_phys + sizeof(struct iwl_cmd_header) +
offsetof(struct iwl_tx_cmd, scratch);
tx_cmd->dram_lsb_ptr = cpu_to_le32(scratch_phys);
tx_cmd->dram_msb_ptr = iwl_get_dma_hi_address(scratch_phys);
if (!ieee80211_get_morefrag(hdr)) {
txq->need_update = 1;
if (qc)
priv->stations[sta_id].tid[tid].seq_number = seq_number;
} else {
wait_write_ptr = 1;
txq->need_update = 0;
}
iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd, sizeof(*tx_cmd));
iwl_print_hex_dump(priv, IWL_DL_TX, (u8 *)tx_cmd->hdr, hdr_len);
/* Set up entry for this TFD in Tx byte-count array */
priv->cfg->ops->lib->txq_update_byte_cnt_tbl(priv, txq, len);
/* Tell device the write index *just past* this latest filled TFD */
q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd);
ret = iwl_txq_update_write_ptr(priv, txq);
spin_unlock_irqrestore(&priv->lock, flags);
if (ret)
return ret;
if ((iwl_queue_space(q) < q->high_mark)
&& priv->mac80211_registered) {
if (wait_write_ptr) {
spin_lock_irqsave(&priv->lock, flags);
txq->need_update = 1;
iwl_txq_update_write_ptr(priv, txq);
spin_unlock_irqrestore(&priv->lock, flags);
}
ieee80211_stop_queue(priv->hw, ctl->queue);
}
return 0;
drop_unlock:
spin_unlock_irqrestore(&priv->lock, flags);
drop:
return -1;
}
EXPORT_SYMBOL(iwl_tx_skb);
/*************** HOST COMMAND QUEUE FUNCTIONS *****/
/**
* iwl_enqueue_hcmd - enqueue a uCode command
* @priv: device private data point
* @cmd: a point to the ucode command structure
*
* The function returns < 0 values to indicate the operation is
* failed. On success, it turns the index (> 0) of command in the
* command queue.
*/
int iwl_enqueue_hcmd(struct iwl_priv *priv, struct iwl_host_cmd *cmd)
{
struct iwl_tx_queue *txq = &priv->txq[IWL_CMD_QUEUE_NUM];
struct iwl_queue *q = &txq->q;
struct iwl_tfd_frame *tfd;
u32 *control_flags;
struct iwl_cmd *out_cmd;
u32 idx;
u16 fix_size;
dma_addr_t phys_addr;
int ret;
unsigned long flags;
cmd->len = priv->cfg->ops->utils->get_hcmd_size(cmd->id, cmd->len);
fix_size = (u16)(cmd->len + sizeof(out_cmd->hdr));
/* If any of the command structures end up being larger than
* the TFD_MAX_PAYLOAD_SIZE, and it sent as a 'small' command then
* we will need to increase the size of the TFD entries */
BUG_ON((fix_size > TFD_MAX_PAYLOAD_SIZE) &&
!(cmd->meta.flags & CMD_SIZE_HUGE));
if (iwl_is_rfkill(priv)) {
IWL_DEBUG_INFO("Not sending command - RF KILL");
return -EIO;
}
if (iwl_queue_space(q) < ((cmd->meta.flags & CMD_ASYNC) ? 2 : 1)) {
IWL_ERROR("No space for Tx\n");
return -ENOSPC;
}
spin_lock_irqsave(&priv->hcmd_lock, flags);
tfd = &txq->bd[q->write_ptr];
memset(tfd, 0, sizeof(*tfd));
control_flags = (u32 *) tfd;
idx = get_cmd_index(q, q->write_ptr, cmd->meta.flags & CMD_SIZE_HUGE);
out_cmd = &txq->cmd[idx];
out_cmd->hdr.cmd = cmd->id;
memcpy(&out_cmd->meta, &cmd->meta, sizeof(cmd->meta));
memcpy(&out_cmd->cmd.payload, cmd->data, cmd->len);
/* At this point, the out_cmd now has all of the incoming cmd
* information */
out_cmd->hdr.flags = 0;
out_cmd->hdr.sequence = cpu_to_le16(QUEUE_TO_SEQ(IWL_CMD_QUEUE_NUM) |
INDEX_TO_SEQ(q->write_ptr));
if (out_cmd->meta.flags & CMD_SIZE_HUGE)
out_cmd->hdr.sequence |= cpu_to_le16(SEQ_HUGE_FRAME);
phys_addr = txq->dma_addr_cmd + sizeof(txq->cmd[0]) * idx +
offsetof(struct iwl_cmd, hdr);
iwl_hw_txq_attach_buf_to_tfd(priv, tfd, phys_addr, fix_size);
IWL_DEBUG_HC("Sending command %s (#%x), seq: 0x%04X, "
"%d bytes at %d[%d]:%d\n",
get_cmd_string(out_cmd->hdr.cmd),
out_cmd->hdr.cmd, le16_to_cpu(out_cmd->hdr.sequence),
fix_size, q->write_ptr, idx, IWL_CMD_QUEUE_NUM);
txq->need_update = 1;
/* Set up entry in queue's byte count circular buffer */
priv->cfg->ops->lib->txq_update_byte_cnt_tbl(priv, txq, 0);
/* Increment and update queue's write index */
q->write_ptr = iwl_queue_inc_wrap(q->write_ptr, q->n_bd);
ret = iwl_txq_update_write_ptr(priv, txq);
spin_unlock_irqrestore(&priv->hcmd_lock, flags);
return ret ? ret : idx;
}
