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iwlwifi: add testmode command for rx forwarding

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Added a testmode command which tells iwl_rx_dispatch
to send the RX both as a notification to nl80211 and
with the registered RX handlers.

This is used for monitoring RX from userspace while preserving
the regular flows in the driver.

Signed-off-by: Amit Beka <amit.beka@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:
Amit Beka 2012-03-07 09:52:29 -08:00 committed by John W. Linville
parent 8722c899a0
commit 0aef8ddc8b
3 changed files with 56 additions and 9 deletions
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20
drivers/net/wireless/iwlwifi/iwl-agn-rx.c
View File

@ -1152,6 +1152,8 @@ int iwl_rx_dispatch(struct iwl_op_mode *op_mode, struct iwl_rx_cmd_buffer *rxb,
{
struct iwl_rx_packet *pkt = rxb_addr(rxb);
struct iwl_priv *priv = IWL_OP_MODE_GET_DVM(op_mode);
void (*pre_rx_handler)(struct iwl_priv *,
struct iwl_rx_cmd_buffer *);
int err = 0;
/*
@ -1161,10 +1163,20 @@ int iwl_rx_dispatch(struct iwl_op_mode *op_mode, struct iwl_rx_cmd_buffer *rxb,
*/
iwl_notification_wait_notify(&priv->notif_wait, pkt);
if (priv->pre_rx_handler &&
priv->ucode_owner == IWL_OWNERSHIP_TM)
priv->pre_rx_handler(priv, rxb);
else {
/* RX data may be forwarded to userspace (using pre_rx_handler) in one
* of two cases: the first, that the user owns the uCode through
* testmode - in such case the pre_rx_handler is set and no further
* processing takes place. The other case is when the user want to
* monitor the rx w/o affecting the regular flow - the pre_rx_handler
* will be set but the ownership flag != IWL_OWNERSHIP_TM and the flow
* continues.
* We need to use ACCESS_ONCE to prevent a case where the handler
* changes between the check and the call.
*/
pre_rx_handler = ACCESS_ONCE(priv->pre_rx_handler);
if (pre_rx_handler)
pre_rx_handler(priv, rxb);
if (priv->ucode_owner != IWL_OWNERSHIP_TM) {
/* Based on type of command response or notification,
* handle those that need handling via function in
* rx_handlers table. See iwl_setup_rx_handlers() */

32
drivers/net/wireless/iwlwifi/iwl-testmode.c
View File

@ -125,6 +125,8 @@ struct nla_policy iwl_testmode_gnl_msg_policy[IWL_TM_ATTR_MAX] = {
[IWL_TM_ATTR_FW_TYPE] = { .type = NLA_U32, },
[IWL_TM_ATTR_FW_INST_SIZE] = { .type = NLA_U32, },
[IWL_TM_ATTR_FW_DATA_SIZE] = { .type = NLA_U32, },
[IWL_TM_ATTR_ENABLE_NOTIFICATION] = {.type = NLA_FLAG, },
};
/*
@ -194,7 +196,7 @@ nla_put_failure:
void iwl_testmode_init(struct iwl_priv *priv)
{
priv->pre_rx_handler = iwl_testmode_ucode_rx_pkt;
priv->pre_rx_handler = NULL;
priv->testmode_trace.trace_enabled = false;
priv->testmode_mem.read_in_progress = false;
}
@ -770,9 +772,13 @@ static int iwl_testmode_ownership(struct ieee80211_hw *hw, struct nlattr **tb)
}
owner = nla_get_u8(tb[IWL_TM_ATTR_UCODE_OWNER]);
if ((owner == IWL_OWNERSHIP_DRIVER) || (owner == IWL_OWNERSHIP_TM))
if (owner == IWL_OWNERSHIP_DRIVER) {
priv->ucode_owner = owner;
else {
priv->pre_rx_handler = NULL;
} else if (owner == IWL_OWNERSHIP_TM) {
priv->pre_rx_handler = iwl_testmode_ucode_rx_pkt;
priv->ucode_owner = owner;
} else {
IWL_ERR(priv, "Invalid owner\n");
return -EINVAL;
}
@ -937,6 +943,20 @@ static int iwl_testmode_buffer_dump(struct ieee80211_hw *hw,
return -ENOBUFS;
}
static int iwl_testmode_notifications(struct ieee80211_hw *hw,
struct nlattr **tb)
{
struct iwl_priv *priv = IWL_MAC80211_GET_DVM(hw);
bool enable;
enable = nla_get_flag(tb[IWL_TM_ATTR_ENABLE_NOTIFICATION]);
if (enable)
priv->pre_rx_handler = iwl_testmode_ucode_rx_pkt;
else
priv->pre_rx_handler = NULL;
return 0;
}
/* The testmode gnl message handler that takes the gnl message from the
* user space and parses it per the policy iwl_testmode_gnl_msg_policy, then
@ -1022,6 +1042,12 @@ int iwlagn_mac_testmode_cmd(struct ieee80211_hw *hw, void *data, int len)
result = iwl_testmode_indirect_mem(hw, tb);
break;
case IWL_TM_CMD_APP2DEV_NOTIFICATIONS:
IWL_DEBUG_INFO(priv, "testmode notifications cmd "
"to driver\n");
result = iwl_testmode_notifications(hw, tb);
break;
default:
IWL_ERR(priv, "Unknown testmode command\n");
result = -ENOSYS;

13
drivers/net/wireless/iwlwifi/iwl-testmode.h
View File

@ -122,6 +122,9 @@
* Fore reading, a READ command is sent from the userspace and the data
* is returned when the user calls a DUMP command.
* For writing, only a WRITE command is used.
* @IWL_TM_CMD_APP2DEV_NOTIFICATIONS:
* Command to enable/disable notifications (currently RX packets) from the
* driver to userspace.
*/
enum iwl_tm_cmd_t {
IWL_TM_CMD_APP2DEV_UCODE = 1,
@ -152,7 +155,8 @@ enum iwl_tm_cmd_t {
IWL_TM_CMD_APP2DEV_INDIRECT_BUFFER_READ = 26,
IWL_TM_CMD_APP2DEV_INDIRECT_BUFFER_DUMP = 27,
IWL_TM_CMD_APP2DEV_INDIRECT_BUFFER_WRITE = 28,
IWL_TM_CMD_MAX = 29,
IWL_TM_CMD_APP2DEV_NOTIFICATIONS = 29,
IWL_TM_CMD_MAX = 30,
};
/*
@ -256,6 +260,10 @@ enum iwl_tm_cmd_t {
* When IWL_TM_ATTR_COMMAND is IWL_TM_CMD_APP2DEV_UCODE this flag
* indicates that the user wants to receive the response of the command
* in a reply SKB. If it's not present, the response is not returned.
* @IWL_TM_ATTR_ENABLE_NOTIFICATIONS:
* When IWL_TM_ATTR_COMMAND is IWL_TM_CMD_APP2DEV_NOTIFICATIONS, this
* flag enables (if present) or disables (if not) the forwarding
* to userspace.
*/
enum iwl_tm_attr_t {
IWL_TM_ATTR_NOT_APPLICABLE = 0,
@ -282,7 +290,8 @@ enum iwl_tm_attr_t {
IWL_TM_ATTR_FW_INST_SIZE = 21,
IWL_TM_ATTR_FW_DATA_SIZE = 22,
IWL_TM_ATTR_UCODE_CMD_SKB = 23,
IWL_TM_ATTR_MAX = 24,
IWL_TM_ATTR_ENABLE_NOTIFICATION = 24,
IWL_TM_ATTR_MAX = 25,
};
/* uCode trace buffer */