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Commit 98d7e09a authored by Zhu Yi's avatar Zhu Yi Committed by David S. Miller
Browse files

[PATCH] iwlwifi: set fixed rate through debugfs 



This patch adds fixed rate setting through debugfs

$ echo <rate_n_flags> > \
/sys/kernel/debug/ieee80211/phy<X>/stations/<mac>/rate_scale_table

Currently there is no way to turn to rate scaling working again.
Will be fixed in later.

Signed-off-by: default avatarTomas Winkler <tomas.winkler@intel.com>
Signed-off-by: default avatarZhu Yi <yi.zhu@intel.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 1b696de2

drivers/net/wireless/iwlwifi/iwl-4965-rs.c

+70 −2
Original line number Diff line number Diff line
@@ -124,6 +124,8 @@ struct iwl_rate_scale_priv { 
	struct iwl_scale_tbl_info lq_info[LQ_SIZE];

#ifdef CONFIG_MAC80211_DEBUGFS

	struct dentry *rs_sta_dbgfs_scale_table_file;

	struct iwl_rate dbg_fixed;

	struct iwl_priv *drv;

#endif

};
@@ -136,6 +138,14 @@ static void rs_fill_link_cmd(struct iwl_rate_scale_priv *lq_data, 
			     struct iwl_link_quality_cmd *tbl);





#ifdef CONFIG_MAC80211_DEBUGFS

static void rs_dbgfs_set_mcs(struct iwl_rate_scale_priv *rs_priv,

				struct iwl_rate *mcs, int index);

#else

static void rs_dbgfs_set_mcs(struct iwl_rate_scale_priv *rs_priv,

				struct iwl_rate *mcs, int index)

{}

#endif

static s32 expected_tpt_A[IWL_RATE_COUNT] = {

	0, 0, 0, 0, 40, 57, 72, 98, 121, 154, 177, 186, 186

};
@@ -1866,6 +1876,9 @@ static void rs_rate_init(void *priv_rate, void *priv_sta, 
	IWL_DEBUG_HT("MIMO RATE 0x%X SISO MASK 0x%X\n", crl->active_siso_rate,

		     crl->active_mimo_rate);

#endif /*CONFIG_IWLWIFI_HT*/

#ifdef CONFIG_MAC80211_DEBUGFS

	crl->drv = priv;

#endif



	if (priv->assoc_station_added)

		priv->lq_mngr.lq_ready = 1;
@@ -1885,6 +1898,8 @@ static void rs_fill_link_cmd(struct iwl_rate_scale_priv *lq_data, 
	struct iwl_rate new_rate;

	struct iwl_scale_tbl_info tbl_type = { 0 };



	rs_dbgfs_set_mcs(lq_data, tx_mcs, index);



	rs_get_tbl_info_from_mcs(tx_mcs, lq_data->phymode,

				  &tbl_type, &rate_idx);
@@ -1919,6 +1934,8 @@ static void rs_fill_link_cmd(struct iwl_rate_scale_priv *lq_data, 
					ant_toggle_count = 1;

				}

			}



			rs_dbgfs_set_mcs(lq_data, &new_rate, index);

			lq_cmd->rs_table[index].rate_n_flags =

					cpu_to_le32(new_rate.rate_n_flags);

			repeat_rate--;
@@ -1947,6 +1964,7 @@ static void rs_fill_link_cmd(struct iwl_rate_scale_priv *lq_data, 


		use_ht_possible = 0;



		rs_dbgfs_set_mcs(lq_data, &new_rate, index);

		lq_cmd->rs_table[index].rate_n_flags =

				cpu_to_le32(new_rate.rate_n_flags);
@@ -2002,7 +2020,54 @@ static int open_file_generic(struct inode *inode, struct file *file) 
	file->private_data = inode->i_private;

	return 0;

}

static void rs_dbgfs_set_mcs(struct iwl_rate_scale_priv *rs_priv,

				struct iwl_rate *mcs, int index)

{

	const u32 cck_rate = 0x820A;

	if (rs_priv->dbg_fixed.rate_n_flags) {

		if (index < 12)

			mcs->rate_n_flags = rs_priv->dbg_fixed.rate_n_flags;

		else

			mcs->rate_n_flags = cck_rate;

		IWL_DEBUG_RATE("Fixed rate ON\n");

		return;

	}



	IWL_DEBUG_RATE("Fixed rate OFF\n");

}



static ssize_t rs_sta_dbgfs_scale_table_write(struct file *file,

			const char __user *user_buf, size_t count, loff_t *ppos)

{

	struct iwl_rate_scale_priv *rs_priv = file->private_data;

	char buf[64];

	int buf_size;

	u32 parsed_rate;



	memset(buf, 0, sizeof(buf));

	buf_size = min(count, sizeof(buf) -  1);

	if (copy_from_user(buf, user_buf, buf_size))

		return -EFAULT;



	if (sscanf(buf, "%x", &parsed_rate) == 1)

		rs_priv->dbg_fixed.rate_n_flags = parsed_rate;

	else

		rs_priv->dbg_fixed.rate_n_flags = 0;



	rs_priv->active_rate = 0x0FFF;

	rs_priv->active_siso_rate = 0x1FD0;

	rs_priv->active_mimo_rate = 0x1FD0;



	IWL_DEBUG_RATE("sta_id %d rate 0x%X\n",

		rs_priv->lq.sta_id, rs_priv->dbg_fixed.rate_n_flags);



	if (rs_priv->dbg_fixed.rate_n_flags) {

		rs_fill_link_cmd(rs_priv, &rs_priv->dbg_fixed, &rs_priv->lq);

		rs_send_lq_cmd(rs_priv->drv, &rs_priv->lq, CMD_ASYNC);

	}



	return count;

}

static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file,

			char __user *user_buf, size_t count, loff_t *ppos)

{
@@ -2013,9 +2078,11 @@ static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 
	struct iwl_rate_scale_priv *rs_priv = file->private_data;



	desc += sprintf(buff+desc, "sta_id %d\n", rs_priv->lq.sta_id);

	desc += sprintf(buff+desc, "failed=%d success=%d rate=%X\n",

	desc += sprintf(buff+desc, "failed=%d success=%d rate=0%X\n",

			rs_priv->total_failed, rs_priv->total_success,

			rs_priv->active_rate);

	desc += sprintf(buff+desc, "fixed rate 0x%X\n",

			rs_priv->dbg_fixed.rate_n_flags);

	desc += sprintf(buff+desc, "general:"

		"flags=0x%X mimo-d=%d s-ant0x%x d-ant=0x%x\n",

		rs_priv->lq.general_params.flags,
@@ -2045,6 +2112,7 @@ static ssize_t rs_sta_dbgfs_scale_table_read(struct file *file, 
}



static const struct file_operations rs_sta_dbgfs_scale_table_ops = {

	.write = rs_sta_dbgfs_scale_table_write,

	.read = rs_sta_dbgfs_scale_table_read,

	.open = open_file_generic,

};