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iwlagn: add an API to free the TX context

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Tx free functions move to the transport layer. Unify the functions that deal with tx queues and cmd queue.

Since the CMD queue is not fully allocated, but uses the q->n_bd / q->window trick, the release flow of TX queue and CMD queue was different.
iwlagn_txq_free_tfd receives now the index of the TFD to be freed, which allows to unify the release flow for all the queues.

Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Emmanuel Grumbach 2011-07-08 08:46:10 -07:00 committed by John W. Linville
parent afaf6b5742
commit 1359ca4f30
8 changed files with 95 additions and 148 deletions
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32
drivers/net/wireless/iwlwifi/iwl-agn-tx.c
View File

@ -851,31 +851,6 @@ static inline void iwlagn_free_dma_ptr(struct iwl_priv *priv,
memset(ptr, 0, sizeof(*ptr));
}
/**
* iwlagn_hw_txq_ctx_free - Free TXQ Context
*
* Destroy all TX DMA queues and structures
*/
void iwlagn_hw_txq_ctx_free(struct iwl_priv *priv)
{
int txq_id;
/* Tx queues */
if (priv->txq) {
for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
if (txq_id == priv->cmd_queue)
iwl_cmd_queue_free(priv);
else
iwl_tx_queue_free(priv, txq_id);
}
iwlagn_free_dma_ptr(priv, &priv->kw);
iwlagn_free_dma_ptr(priv, &priv->scd_bc_tbls);
/* free tx queue structure */
iwl_free_txq_mem(priv);
}
/**
* iwlagn_txq_ctx_stop - Stop all Tx DMA channels
*/
@ -906,10 +881,7 @@ void iwlagn_txq_ctx_stop(struct iwl_priv *priv)
/* Unmap DMA from host system and free skb's */
for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
if (txq_id == priv->cmd_queue)
iwl_cmd_queue_unmap(priv);
else
iwl_tx_queue_unmap(priv, txq_id);
iwl_tx_queue_unmap(priv, txq_id);
}
/*
@ -1170,7 +1142,7 @@ int iwlagn_tx_queue_reclaim(struct iwl_priv *priv, int txq_id, int index)
iwlagn_txq_inval_byte_cnt_tbl(priv, txq);
iwlagn_txq_free_tfd(priv, txq);
iwlagn_txq_free_tfd(priv, txq, txq->q.read_ptr);
}
return nfreed;
}

2
drivers/net/wireless/iwlwifi/iwl-agn.c
View File

@ -3710,7 +3710,7 @@ void __devexit iwl_remove(struct iwl_priv * priv)
iwl_dealloc_ucode(priv);
priv->trans.ops->rx_free(priv);
iwlagn_hw_txq_ctx_free(priv);
priv->trans.ops->tx_free(priv);
iwl_eeprom_free(priv);

4
drivers/net/wireless/iwlwifi/iwl-agn.h
View File

@ -198,7 +198,8 @@ int iwlagn_hwrate_to_mac80211_idx(u32 rate_n_flags, enum ieee80211_band band);
void iwl_setup_rx_handlers(struct iwl_priv *priv);
/* tx */
void iwlagn_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq);
void iwlagn_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq,
int index);
int iwlagn_txq_attach_buf_to_tfd(struct iwl_priv *priv,
struct iwl_tx_queue *txq,
dma_addr_t addr, u16 len, u8 reset);
@ -217,7 +218,6 @@ int iwlagn_txq_check_empty(struct iwl_priv *priv,
void iwlagn_rx_reply_compressed_ba(struct iwl_priv *priv,
struct iwl_rx_mem_buffer *rxb);
int iwlagn_tx_queue_reclaim(struct iwl_priv *priv, int txq_id, int index);
void iwlagn_hw_txq_ctx_free(struct iwl_priv *priv);
void iwlagn_txq_ctx_stop(struct iwl_priv *priv);
static inline u32 iwl_tx_status_to_mac80211(u32 status)

6
drivers/net/wireless/iwlwifi/iwl-core.c
View File

@ -1370,12 +1370,6 @@ void iwl_mac_remove_interface(struct ieee80211_hw *hw,
}
void iwl_free_txq_mem(struct iwl_priv *priv)
{
kfree(priv->txq);
priv->txq = NULL;
}
#ifdef CONFIG_IWLWIFI_DEBUGFS
#define IWL_TRAFFIC_DUMP_SIZE (IWL_TRAFFIC_ENTRY_SIZE * IWL_TRAFFIC_ENTRIES)

5
drivers/net/wireless/iwlwifi/iwl-core.h
View File

@ -328,8 +328,6 @@ void iwl_mac_remove_interface(struct ieee80211_hw *hw,
int iwl_mac_change_interface(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
enum nl80211_iftype newtype, bool newp2p);
void iwl_free_txq_mem(struct iwl_priv *priv);
#ifdef CONFIG_IWLWIFI_DEBUGFS
int iwl_alloc_traffic_mem(struct iwl_priv *priv);
void iwl_free_traffic_mem(struct iwl_priv *priv);
@ -371,8 +369,6 @@ static inline void iwl_update_stats(struct iwl_priv *priv, bool is_tx,
/*****************************************************
* RX
******************************************************/
void iwl_cmd_queue_free(struct iwl_priv *priv);
void iwl_cmd_queue_unmap(struct iwl_priv *priv);
void iwl_rx_queue_update_write_ptr(struct iwl_priv *priv,
struct iwl_rx_queue *q);
int iwl_rx_queue_space(const struct iwl_rx_queue *q);
@ -386,7 +382,6 @@ void iwl_chswitch_done(struct iwl_priv *priv, bool is_success);
* TX
******************************************************/
void iwl_txq_update_write_ptr(struct iwl_priv *priv, struct iwl_tx_queue *txq);
void iwl_tx_queue_free(struct iwl_priv *priv, int txq_id);
int iwl_queue_init(struct iwl_priv *priv, struct iwl_queue *q,
int count, int slots_num, u32 id);
void iwl_tx_queue_unmap(struct iwl_priv *priv, int txq_id);

3
drivers/net/wireless/iwlwifi/iwl-dev.h
View File

@ -1233,11 +1233,14 @@ struct iwl_trans;
* @rx_init: inits the rx memory, allocate it if needed
* @rx_free: frees the rx memory
* @tx_init:inits the tx memory, allocate if needed
* @tx_free: frees the tx memory
*/
struct iwl_trans_ops {
int (*rx_init)(struct iwl_priv *priv);
void (*rx_free)(struct iwl_priv *priv);
int (*tx_init)(struct iwl_priv *priv);
void (*tx_free)(struct iwl_priv *priv);
};
struct iwl_trans {

83
drivers/net/wireless/iwlwifi/iwl-trans.c
View File

@ -203,6 +203,16 @@ static inline int iwlagn_alloc_dma_ptr(struct iwl_priv *priv,
return 0;
}
static inline void iwlagn_free_dma_ptr(struct iwl_priv *priv,
struct iwl_dma_ptr *ptr)
{
if (unlikely(!ptr->addr))
return;
dma_free_coherent(priv->bus.dev, ptr->size, ptr->addr, ptr->dma);
memset(ptr, 0, sizeof(*ptr));
}
static int iwl_trans_txq_alloc(struct iwl_priv *priv, struct iwl_tx_queue *txq,
int slots_num, u32 txq_id)
{
@ -212,6 +222,8 @@ static int iwl_trans_txq_alloc(struct iwl_priv *priv, struct iwl_tx_queue *txq,
if (WARN_ON(txq->meta || txq->cmd || txq->txb || txq->tfds))
return -EINVAL;
txq->q.n_window = slots_num;
txq->meta = kzalloc(sizeof(txq->meta[0]) * slots_num,
GFP_KERNEL);
txq->cmd = kzalloc(sizeof(txq->cmd[0]) * slots_num,
@ -306,6 +318,72 @@ static int iwl_trans_txq_init(struct iwl_priv *priv, struct iwl_tx_queue *txq,
return 0;
}
/**
* 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, int txq_id)
{
struct iwl_tx_queue *txq = &priv->txq[txq_id];
struct device *dev = priv->bus.dev;
int i;
if (WARN_ON(!txq))
return;
iwl_tx_queue_unmap(priv, txq_id);
/* De-alloc array of command/tx buffers */
for (i = 0; i < txq->q.n_window; i++)
kfree(txq->cmd[i]);
/* De-alloc circular buffer of TFDs */
if (txq->q.n_bd) {
dma_free_coherent(dev, priv->hw_params.tfd_size *
txq->q.n_bd, txq->tfds, txq->q.dma_addr);
memset(&txq->q.dma_addr, 0, sizeof(txq->q.dma_addr));
}
/* De-alloc array of per-TFD driver data */
kfree(txq->txb);
txq->txb = NULL;
/* deallocate arrays */
kfree(txq->cmd);
kfree(txq->meta);
txq->cmd = NULL;
txq->meta = NULL;
/* 0-fill queue descriptor structure */
memset(txq, 0, sizeof(*txq));
}
/**
* iwl_trans_tx_free - Free TXQ Context
*
* Destroy all TX DMA queues and structures
*/
static void iwl_trans_tx_free(struct iwl_priv *priv)
{
int txq_id;
/* Tx queues */
if (priv->txq) {
for (txq_id = 0; txq_id < priv->hw_params.max_txq_num; txq_id++)
iwl_tx_queue_free(priv, txq_id);
}
kfree(priv->txq);
priv->txq = NULL;
iwlagn_free_dma_ptr(priv, &priv->kw);
iwlagn_free_dma_ptr(priv, &priv->scd_bc_tbls);
}
/**
* iwl_trans_tx_alloc - allocate TX context
* Allocate all Tx DMA structures and initialize them
@ -362,7 +440,7 @@ static int iwl_trans_tx_alloc(struct iwl_priv *priv)
return 0;
error:
iwlagn_hw_txq_ctx_free(priv);
priv->trans.ops->tx_free(priv);
return ret;
}
@ -406,7 +484,7 @@ static int iwl_trans_tx_init(struct iwl_priv *priv)
error:
/*Upon error, free only if we allocated something */
if (alloc)
iwlagn_hw_txq_ctx_free(priv);
priv->trans.ops->tx_free(priv);
return ret;
}
@ -415,6 +493,7 @@ static const struct iwl_trans_ops trans_ops = {
.rx_free = iwl_trans_rx_free,
.tx_init = iwl_trans_tx_init,
.tx_free = iwl_trans_tx_free,
};
void iwl_trans_register(struct iwl_trans *trans)

108
drivers/net/wireless/iwlwifi/iwl-tx.c
View File

@ -157,14 +157,15 @@ static void iwlagn_unmap_tfd(struct iwl_priv *priv, struct iwl_cmd_meta *meta,
* iwlagn_txq_free_tfd - Free all chunks referenced by TFD [txq->q.read_ptr]
* @priv - driver private data
* @txq - tx queue
* @index - the index of the TFD to be freed
*
* Does NOT advance any TFD circular buffer read/write indexes
* Does NOT free the TFD itself (which is within circular buffer)
*/
void iwlagn_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq)
void iwlagn_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq,
int index)
{
struct iwl_tfd *tfd_tmp = txq->tfds;
int index = txq->q.read_ptr;
iwlagn_unmap_tfd(priv, &txq->meta[index], &tfd_tmp[index],
DMA_TO_DEVICE);
@ -173,12 +174,12 @@ void iwlagn_txq_free_tfd(struct iwl_priv *priv, struct iwl_tx_queue *txq)
if (txq->txb) {
struct sk_buff *skb;
skb = txq->txb[txq->q.read_ptr].skb;
skb = txq->txb[index].skb;
/* can be called from irqs-disabled context */
if (skb) {
dev_kfree_skb_any(skb);
txq->txb[txq->q.read_ptr].skb = NULL;
txq->txb[index].skb = NULL;
}
}
}
@ -232,108 +233,11 @@ void iwl_tx_queue_unmap(struct iwl_priv *priv, int txq_id)
return;
while (q->write_ptr != q->read_ptr) {
iwlagn_txq_free_tfd(priv, txq);
iwlagn_txq_free_tfd(priv, txq, get_cmd_index(q, q->read_ptr));
q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd);
}
}
/**
* 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.
*/
void iwl_tx_queue_free(struct iwl_priv *priv, int txq_id)
{
struct iwl_tx_queue *txq = &priv->txq[txq_id];
struct device *dev = priv->bus.dev;
int i;
iwl_tx_queue_unmap(priv, txq_id);
/* De-alloc array of command/tx buffers */
for (i = 0; i < TFD_TX_CMD_SLOTS; i++)
kfree(txq->cmd[i]);
/* De-alloc circular buffer of TFDs */
if (txq->q.n_bd)
dma_free_coherent(dev, priv->hw_params.tfd_size *
txq->q.n_bd, txq->tfds, txq->q.dma_addr);
/* De-alloc array of per-TFD driver data */
kfree(txq->txb);
txq->txb = NULL;
/* deallocate arrays */
kfree(txq->cmd);
kfree(txq->meta);
txq->cmd = NULL;
txq->meta = NULL;
/* 0-fill queue descriptor structure */
memset(txq, 0, sizeof(*txq));
}
/**
* iwl_cmd_queue_unmap - Unmap any remaining DMA mappings from command queue
*/
void iwl_cmd_queue_unmap(struct iwl_priv *priv)
{
struct iwl_tx_queue *txq = &priv->txq[priv->cmd_queue];
struct iwl_queue *q = &txq->q;
int i;
if (q->n_bd == 0)
return;
while (q->read_ptr != q->write_ptr) {
i = get_cmd_index(q, q->read_ptr);
iwlagn_unmap_tfd(priv, &txq->meta[i], &txq->tfds[i],
DMA_BIDIRECTIONAL);
txq->meta[i].flags = 0;
q->read_ptr = iwl_queue_inc_wrap(q->read_ptr, q->n_bd);
}
}
/**
* iwl_cmd_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.
*/
void iwl_cmd_queue_free(struct iwl_priv *priv)
{
struct iwl_tx_queue *txq = &priv->txq[priv->cmd_queue];
struct device *dev = priv->bus.dev;
int i;
iwl_cmd_queue_unmap(priv);
/* De-alloc array of command/tx buffers */
for (i = 0; i < TFD_CMD_SLOTS; i++)
kfree(txq->cmd[i]);
/* De-alloc circular buffer of TFDs */
if (txq->q.n_bd)
dma_free_coherent(dev, priv->hw_params.tfd_size * txq->q.n_bd,
txq->tfds, txq->q.dma_addr);
/* deallocate arrays */
kfree(txq->cmd);
kfree(txq->meta);
txq->cmd = NULL;
txq->meta = NULL;
/* 0-fill queue descriptor structure */
memset(txq, 0, sizeof(*txq));
}
/*************** DMA-QUEUE-GENERAL-FUNCTIONS *****
* DMA services
*