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iwlwifi: change byte count table for a000 devices

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Since TFD was enlarged to 256 bytes, the fetch of the TFD
itself is very expensive.
To make DRAM to SRAM more efficient, bits 12-13 will indicate
the number of 64 byte chunks that should be transferred to
SRAM.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Sara Sharon 2016-07-04 14:34:26 +03:00 committed by Luca Coelho
parent 6983ba6951
commit 4fe10bc603
2 changed files with 35 additions and 8 deletions
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7
drivers/net/wireless/intel/iwlwifi/iwl-fh.h
View File

@ -734,8 +734,13 @@ struct iwl_tfh_tfd {
/**
* struct iwlagn_schedq_bc_tbl scheduler byte count table
* base physical address provided by SCD_DRAM_BASE_ADDR
* For devices up to a000:
* @tfd_offset 0-12 - tx command byte count
* 12-16 - station index
* 12-16 - station index
* For a000 and on:
* @tfd_offset 0-12 - tx command byte count
* 12-13 - number of 64 byte chunks
* 14-16 - reserved
*/
struct iwlagn_scd_bc_tbl {
__le16 tfd_offset[TFD_QUEUE_BC_SIZE];

36
drivers/net/wireless/intel/iwlwifi/pcie/tx.c
View File

@ -176,14 +176,14 @@ static void iwl_pcie_txq_stuck_timer(unsigned long data)
* iwl_pcie_txq_update_byte_cnt_tbl - Set up entry in Tx byte-count array
*/
static void iwl_pcie_txq_update_byte_cnt_tbl(struct iwl_trans *trans,
struct iwl_txq *txq, u16 byte_cnt)
struct iwl_txq *txq, u16 byte_cnt,
int num_tbs)
{
struct iwlagn_scd_bc_tbl *scd_bc_tbl;
struct iwl_trans_pcie *trans_pcie = IWL_TRANS_GET_PCIE_TRANS(trans);
int write_ptr = txq->q.write_ptr;
int txq_id = txq->q.id;
u8 sec_ctl = 0;
u8 sta_id = 0;
u16 len = byte_cnt + IWL_TX_CRC_SIZE + IWL_TX_DELIMITER_SIZE;
__le16 bc_ent;
struct iwl_tx_cmd *tx_cmd =
@ -191,7 +191,6 @@ static void iwl_pcie_txq_update_byte_cnt_tbl(struct iwl_trans *trans,
scd_bc_tbl = trans_pcie->scd_bc_tbls.addr;
sta_id = tx_cmd->sta_id;
sec_ctl = tx_cmd->sec_ctl;
switch (sec_ctl & TX_CMD_SEC_MSK) {
@ -205,14 +204,32 @@ static void iwl_pcie_txq_update_byte_cnt_tbl(struct iwl_trans *trans,
len += IEEE80211_WEP_IV_LEN + IEEE80211_WEP_ICV_LEN;
break;
}
if (trans_pcie->bc_table_dword)
len = DIV_ROUND_UP(len, 4);
if (WARN_ON(len > 0xFFF || write_ptr >= TFD_QUEUE_SIZE_MAX))
return;
bc_ent = cpu_to_le16(len | (sta_id << 12));
if (trans->cfg->use_tfh) {
u8 filled_tfd_size = offsetof(struct iwl_tfh_tfd, tbs) +
num_tbs * sizeof(struct iwl_tfh_tb);
/*
* filled_tfd_size contains the number of filled bytes in the
* TFD.
* Dividing it by 64 will give the number of chunks to fetch
* to SRAM- 0 for one chunk, 1 for 2 and so on.
* If, for example, TFD contains only 3 TBs then 32 bytes
* of the TFD are used, and only one chunk of 64 bytes should
* be fetched
*/
u8 num_fetch_chunks = DIV_ROUND_UP(filled_tfd_size, 64) - 1;
bc_ent = cpu_to_le16(len | (num_fetch_chunks << 12));
} else {
u8 sta_id = tx_cmd->sta_id;
bc_ent = cpu_to_le16(len | (sta_id << 12));
}
scd_bc_tbl[txq_id].tfd_offset[write_ptr] = bc_ent;
@ -240,6 +257,7 @@ static void iwl_pcie_txq_inval_byte_cnt_tbl(struct iwl_trans *trans,
sta_id = tx_cmd->sta_id;
bc_ent = cpu_to_le16(1 | (sta_id << 12));
scd_bc_tbl[txq_id].tfd_offset[read_ptr] = bc_ent;
if (read_ptr < TFD_QUEUE_SIZE_BC_DUP)
@ -1126,7 +1144,8 @@ void iwl_trans_pcie_reclaim(struct iwl_trans *trans, int txq_id, int ssn,
txq->entries[txq->q.read_ptr].skb = NULL;
iwl_pcie_txq_inval_byte_cnt_tbl(trans, txq);
if (!trans->cfg->use_tfh)
iwl_pcie_txq_inval_byte_cnt_tbl(trans, txq);
iwl_pcie_txq_free_tfd(trans, txq);
}
@ -2272,6 +2291,7 @@ int iwl_trans_pcie_tx(struct iwl_trans *trans, struct sk_buff *skb,
struct iwl_queue *q;
dma_addr_t tb0_phys, tb1_phys, scratch_phys;
void *tb1_addr;
void *tfd;
u16 len, tb1_len;
bool wait_write_ptr;
__le16 fc;
@ -2410,8 +2430,10 @@ int iwl_trans_pcie_tx(struct iwl_trans *trans, struct sk_buff *skb,
goto out_err;
}
tfd = iwl_pcie_get_tfd(trans_pcie, txq, q->write_ptr);
/* Set up entry for this TFD in Tx byte-count array */
iwl_pcie_txq_update_byte_cnt_tbl(trans, txq, le16_to_cpu(tx_cmd->len));
iwl_pcie_txq_update_byte_cnt_tbl(trans, txq, le16_to_cpu(tx_cmd->len),
iwl_pcie_tfd_get_num_tbs(trans, tfd));
wait_write_ptr = ieee80211_has_morefrags(fc);