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iwlwifi: mvm: rs: enable forcing single stream Tx decision

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In certain testing scenarios we'd like to force a decision
between STBC/BFER/SISO. In the normal scenario this decision
is done by the FW. Enable this option vis debugfs.

Signed-off-by: Eyal Shapira <eyalx.shapira@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
This commit is contained in:
Eyal Shapira 2015-01-28 14:44:06 +02:00 committed by Emmanuel Grumbach
parent 3d44eebf77
commit 1e9c62fa91
3 changed files with 102 additions and 0 deletions
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8
drivers/net/wireless/iwlwifi/mvm/fw-api-rs.h
View File

@ -330,6 +330,14 @@ enum {
#define LQ_SS_BFER_ALLOWED_POS 2
#define LQ_SS_BFER_ALLOWED (1 << LQ_SS_BFER_ALLOWED_POS)
/* Bit 3: Force BFER or STBC for testing
* If this is set:
* If BFER is allowed then force the ucode to choose BFER else
* If STBC is allowed then force the ucode to choose STBC over SISO
*/
#define LQ_SS_FORCE_POS 3
#define LQ_SS_FORCE (1 << LQ_SS_FORCE_POS)
/* Bit 31: ss_params field is valid. Used for FW backward compatibility
* with other drivers which don't support the ss_params API yet
*/

84
drivers/net/wireless/iwlwifi/mvm/rs.c
View File

@ -39,6 +39,7 @@
#include "sta.h"
#include "iwl-op-mode.h"
#include "mvm.h"
#include "debugfs.h"
#define RS_NAME "iwl-mvm-rs"
@ -3057,6 +3058,20 @@ static void rs_set_lq_ss_params(struct iwl_mvm *mvm,
if (!iwl_mvm_bt_coex_is_mimo_allowed(mvm, sta))
goto out;
/* Check if forcing the decision is configured.
* Note that SISO is forced by not allowing STBC or BFER
*/
if (lq_sta->ss_force == RS_SS_FORCE_STBC)
ss_params |= (LQ_SS_STBC_1SS_ALLOWED | LQ_SS_FORCE);
else if (lq_sta->ss_force == RS_SS_FORCE_BFER)
ss_params |= (LQ_SS_BFER_ALLOWED | LQ_SS_FORCE);
if (lq_sta->ss_force != RS_SS_FORCE_NONE) {
IWL_DEBUG_RATE(mvm, "Forcing single stream Tx decision %d\n",
lq_sta->ss_force);
goto out;
}
if (lq_sta->stbc_capable)
ss_params |= LQ_SS_STBC_1SS_ALLOWED;
@ -3502,9 +3517,73 @@ static const struct file_operations rs_sta_dbgfs_drv_tx_stats_ops = {
.llseek = default_llseek,
};
static ssize_t iwl_dbgfs_ss_force_read(struct file *file,
char __user *user_buf,
size_t count, loff_t *ppos)
{
struct iwl_lq_sta *lq_sta = file->private_data;
char buf[12];
int bufsz = sizeof(buf);
int pos = 0;
static const char * const ss_force_name[] = {
[RS_SS_FORCE_NONE] = "none",
[RS_SS_FORCE_STBC] = "stbc",
[RS_SS_FORCE_BFER] = "bfer",
[RS_SS_FORCE_SISO] = "siso",
};
pos += scnprintf(buf+pos, bufsz-pos, "%s\n",
ss_force_name[lq_sta->ss_force]);
return simple_read_from_buffer(user_buf, count, ppos, buf, pos);
}
static ssize_t iwl_dbgfs_ss_force_write(struct iwl_lq_sta *lq_sta, char *buf,
size_t count, loff_t *ppos)
{
struct iwl_mvm *mvm = lq_sta->pers.drv;
int ret = 0;
if (!strncmp("none", buf, 4)) {
lq_sta->ss_force = RS_SS_FORCE_NONE;
} else if (!strncmp("siso", buf, 4)) {
lq_sta->ss_force = RS_SS_FORCE_SISO;
} else if (!strncmp("stbc", buf, 4)) {
if (lq_sta->stbc_capable) {
lq_sta->ss_force = RS_SS_FORCE_STBC;
} else {
IWL_ERR(mvm,
"can't force STBC. peer doesn't support\n");
ret = -EINVAL;
}
} else if (!strncmp("bfer", buf, 4)) {
if (lq_sta->bfer_capable) {
lq_sta->ss_force = RS_SS_FORCE_BFER;
} else {
IWL_ERR(mvm,
"can't force BFER. peer doesn't support\n");
ret = -EINVAL;
}
} else {
IWL_ERR(mvm, "valid values none|siso|stbc|bfer\n");
ret = -EINVAL;
}
return ret ?: count;
}
#define MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz) \
_MVM_DEBUGFS_READ_WRITE_FILE_OPS(name, bufsz, struct iwl_lq_sta)
#define MVM_DEBUGFS_ADD_FILE_RS(name, parent, mode) do { \
if (!debugfs_create_file(#name, mode, parent, lq_sta, \
&iwl_dbgfs_##name##_ops)) \
goto err; \
} while (0)
MVM_DEBUGFS_READ_WRITE_FILE_OPS(ss_force, 32);
static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
{
struct iwl_lq_sta *lq_sta = mvm_sta;
debugfs_create_file("rate_scale_table", S_IRUSR | S_IWUSR, dir,
lq_sta, &rs_sta_dbgfs_scale_table_ops);
debugfs_create_file("rate_stats_table", S_IRUSR, dir,
@ -3515,6 +3594,11 @@ static void rs_add_debugfs(void *mvm, void *mvm_sta, struct dentry *dir)
&lq_sta->tx_agg_tid_en);
debugfs_create_u8("reduced_tpc", S_IRUSR | S_IWUSR, dir,
&lq_sta->pers.dbg_fixed_txp_reduction);
MVM_DEBUGFS_ADD_FILE_RS(ss_force, dir, S_IRUSR | S_IWUSR);
return;
err:
IWL_ERR((struct iwl_mvm *)mvm, "Can't create debugfs entity\n");
}
static void rs_remove_debugfs(void *mvm, void *mvm_sta)

10
drivers/net/wireless/iwlwifi/mvm/rs.h
View File

@ -240,6 +240,13 @@ enum rs_column {
RS_COLUMN_INVALID,
};
enum rs_ss_force_opt {
RS_SS_FORCE_NONE = 0,
RS_SS_FORCE_STBC,
RS_SS_FORCE_BFER,
RS_SS_FORCE_SISO,
};
/* Packet stats per rate */
struct rs_rate_stats {
u64 success;
@ -324,6 +331,9 @@ struct iwl_lq_sta {
/* tx power reduce for this sta */
int tpc_reduce;
/* force STBC/BFER/SISO for testing */
enum rs_ss_force_opt ss_force;
/* persistent fields - initialized only once - keep last! */
struct lq_sta_pers {
#ifdef CONFIG_MAC80211_DEBUGFS