From: Luciano Coelho <luciano.coelho@xxxxxxxxx>
Instead of hardcoding the differences between UMAC scans and LMAC
scans (which in this case is the number of simultaneous scans that can
run), introduce a max_scans variable and stop scans of the other type
(i.e. stop sched scan if regular scan is being attempted and
vice-versa) if the number of running scans reached the maximum.
Add a function that checks if the maximum number of scans was reached
and stops the appropriate scan to make room for the new scan.
Signed-off-by: Luciano Coelho <luciano.coelho@xxxxxxxxx>
Reviewed-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@xxxxxxxxx>
---
drivers/net/wireless/iwlwifi/mvm/fw-api-scan.h | 10 ++--
drivers/net/wireless/iwlwifi/mvm/mac80211.c | 74 ++++++++++++++++++--------
drivers/net/wireless/iwlwifi/mvm/mvm.h | 5 +-
drivers/net/wireless/iwlwifi/mvm/scan.c | 25 +++++----
4 files changed, 76 insertions(+), 38 deletions(-)
diff --git a/drivers/net/wireless/iwlwifi/mvm/fw-api-scan.h b/drivers/net/wireless/iwlwifi/mvm/fw-api-scan.h
index d6cced4..69daa4e 100644
--- a/drivers/net/wireless/iwlwifi/mvm/fw-api-scan.h
+++ b/drivers/net/wireless/iwlwifi/mvm/fw-api-scan.h
@@ -6,7 +6,7 @@
* GPL LICENSE SUMMARY
*
* Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
- * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
+ * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
@@ -32,7 +32,7 @@
* BSD LICENSE
*
* Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
- * Copyright(c) 2013 - 2014 Intel Mobile Communications GmbH
+ * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -582,7 +582,11 @@ struct iwl_mvm_umac_cmd_hdr {
u8 ver;
} __packed;
-#define IWL_MVM_MAX_SIMULTANEOUS_SCANS 8
+/* The maximum of either of these cannot exceed 8, because we use an
+ * 8-bit mask (see IWL_MVM_SCAN_MASK in mvm.h).
+ */
+#define IWL_MVM_MAX_UMAC_SCANS 8
+#define IWL_MVM_MAX_LMAC_SCANS 1
enum scan_config_flags {
SCAN_CONFIG_FLAG_ACTIVATE = BIT(0),
diff --git a/drivers/net/wireless/iwlwifi/mvm/mac80211.c b/drivers/net/wireless/iwlwifi/mvm/mac80211.c
index f57d584..a5fe070 100644
--- a/drivers/net/wireless/iwlwifi/mvm/mac80211.c
+++ b/drivers/net/wireless/iwlwifi/mvm/mac80211.c
@@ -510,6 +510,14 @@ int iwl_mvm_mac_setup_register(struct iwl_mvm *mvm)
hw->wiphy->max_scan_ssids = PROBE_OPTION_MAX;
+ BUILD_BUG_ON(IWL_MVM_MAX_UMAC_SCANS > HWEIGHT32(IWL_MVM_SCAN_MASK) ||
+ IWL_MVM_MAX_LMAC_SCANS > HWEIGHT32(IWL_MVM_SCAN_MASK));
+
+ if (mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_UMAC_SCAN)
+ mvm->max_scans = IWL_MVM_MAX_UMAC_SCANS;
+ else
+ mvm->max_scans = IWL_MVM_MAX_LMAC_SCANS;
+
if (mvm->nvm_data->bands[IEEE80211_BAND_2GHZ].n_channels)
hw->wiphy->bands[IEEE80211_BAND_2GHZ] =
&mvm->nvm_data->bands[IEEE80211_BAND_2GHZ];
@@ -1426,7 +1434,7 @@ void __iwl_mvm_mac_stop(struct iwl_mvm *mvm)
if (mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_UMAC_SCAN) {
int i;
- for (i = 0; i < IWL_MVM_MAX_SIMULTANEOUS_SCANS; i++) {
+ for (i = 0; i < mvm->max_scans; i++) {
if (WARN_ONCE(mvm->scan_uid[i],
"UMAC scan UID %d was not cleaned\n",
mvm->scan_uid[i]))
@@ -2373,6 +2381,46 @@ static void iwl_mvm_bss_info_changed(struct ieee80211_hw *hw,
iwl_mvm_unref(mvm, IWL_MVM_REF_BSS_CHANGED);
}
+static int iwl_mvm_num_scans(struct iwl_mvm *mvm)
+{
+ return hweight32(mvm->scan_status & IWL_MVM_SCAN_MASK);
+}
+
+static int iwl_mvm_check_running_scans(struct iwl_mvm *mvm, int type)
+{
+ /* This looks a bit arbitrary, but the idea is that if we run
+ * out of possible simultaneous scans and the userspace is
+ * trying to run a scan type that is already running, we
+ * return -EBUSY. But if the userspace wants to start a
+ * different type of scan, we stop the opposite type to make
+ * space for the new request. The reason is backwards
+ * compatibility with old wpa_supplicant that wouldn't stop a
+ * scheduled scan before starting a normal scan.
+ */
+
+ if (iwl_mvm_num_scans(mvm) < mvm->max_scans)
+ return 0;
+
+ /* Use a switch, even though this is a bitmask, so that more
+ * than one bits set will fall in default and we will warn.
+ */
+ switch (type) {
+ case IWL_MVM_SCAN_REGULAR:
+ if (mvm->scan_status & IWL_MVM_SCAN_REGULAR_MASK)
+ return -EBUSY;
+ return iwl_mvm_scan_offload_stop(mvm, true);
+ case IWL_MVM_SCAN_SCHED:
+ if (mvm->scan_status & IWL_MVM_SCAN_SCHED_MASK)
+ return -EBUSY;
+ return iwl_mvm_cancel_scan(mvm);
+ default:
+ WARN_ON(1);
+ break;
+ }
+
+ return -EIO;
+}
+
static int iwl_mvm_mac_hw_scan(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
struct ieee80211_scan_request *hw_req)
@@ -2393,17 +2441,9 @@ static int iwl_mvm_mac_hw_scan(struct ieee80211_hw *hw,
goto out;
}
- if (mvm->scan_status & IWL_MVM_SCAN_REGULAR) {
- ret = -EBUSY;
+ ret = iwl_mvm_check_running_scans(mvm, IWL_MVM_SCAN_REGULAR);
+ if (ret)
goto out;
- }
-
- if (!(mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_UMAC_SCAN) &&
- (mvm->scan_status & IWL_MVM_SCAN_SCHED)) {
- ret = iwl_mvm_scan_offload_stop(mvm, true);
- if (ret)
- goto out;
- }
iwl_mvm_ref(mvm, IWL_MVM_REF_SCAN);
@@ -2769,17 +2809,9 @@ static int iwl_mvm_mac_sched_scan_start(struct ieee80211_hw *hw,
goto out;
}
- if (mvm->scan_status & IWL_MVM_SCAN_SCHED) {
- ret = -EBUSY;
+ ret = iwl_mvm_check_running_scans(mvm, IWL_MVM_SCAN_SCHED);
+ if (ret)
goto out;
- }
-
- if (!(mvm->fw->ucode_capa.capa[0] & IWL_UCODE_TLV_CAPA_UMAC_SCAN) &&
- (mvm->scan_status & IWL_MVM_SCAN_REGULAR)) {
- ret = iwl_mvm_cancel_scan(mvm);
- if (ret)
- goto out;
- }
ret = iwl_mvm_scan_offload_start(mvm, vif, req, ies);
if (ret)
diff --git a/drivers/net/wireless/iwlwifi/mvm/mvm.h b/drivers/net/wireless/iwlwifi/mvm/mvm.h
index a8648fa..cb99eb7 100644
--- a/drivers/net/wireless/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/iwlwifi/mvm/mvm.h
@@ -661,8 +661,11 @@ struct iwl_mvm {
void *scan_cmd;
struct iwl_mcast_filter_cmd *mcast_filter_cmd;
+ /* max number of simultaneous scans the FW supports */
+ unsigned int max_scans;
+
/* UMAC scan tracking */
- u32 scan_uid[IWL_MVM_MAX_SIMULTANEOUS_SCANS];
+ u32 scan_uid[IWL_MVM_MAX_UMAC_SCANS];
u8 scan_seq_num, sched_scan_seq_num;
/* rx chain antennas set through debugfs for the scan command */
diff --git a/drivers/net/wireless/iwlwifi/mvm/scan.c b/drivers/net/wireless/iwlwifi/mvm/scan.c
index 833d078..3721b16 100644
--- a/drivers/net/wireless/iwlwifi/mvm/scan.c
+++ b/drivers/net/wireless/iwlwifi/mvm/scan.c
@@ -1200,7 +1200,7 @@ static int iwl_mvm_find_scan_uid(struct iwl_mvm *mvm, u32 uid)
{
int i;
- for (i = 0; i < IWL_MVM_MAX_SIMULTANEOUS_SCANS; i++)
+ for (i = 0; i < mvm->max_scans; i++)
if (mvm->scan_uid[i] == uid)
return i;
@@ -1217,7 +1217,7 @@ static bool iwl_mvm_find_scan_type(struct iwl_mvm *mvm,
{
int i;
- for (i = 0; i < IWL_MVM_MAX_SIMULTANEOUS_SCANS; i++)
+ for (i = 0; i < mvm->max_scans; i++)
if (mvm->scan_uid[i] & type)
return true;
@@ -1229,7 +1229,7 @@ static int iwl_mvm_find_first_scan(struct iwl_mvm *mvm,
{
int i;
- for (i = 0; i < IWL_MVM_MAX_SIMULTANEOUS_SCANS; i++)
+ for (i = 0; i < mvm->max_scans; i++)
if (mvm->scan_uid[i] & type)
return i;
@@ -1253,8 +1253,7 @@ static u32 iwl_generate_scan_uid(struct iwl_mvm *mvm,
uid = type | (mvm->scan_seq_num <<
IWL_UMAC_SCAN_UID_SEQ_OFFSET);
mvm->scan_seq_num++;
- } while (iwl_mvm_find_scan_uid(mvm, uid) <
- IWL_MVM_MAX_SIMULTANEOUS_SCANS);
+ } while (iwl_mvm_find_scan_uid(mvm, uid) < mvm->max_scans);
IWL_DEBUG_SCAN(mvm, "Generated scan UID %u\n", uid);
@@ -1338,7 +1337,7 @@ int iwl_mvm_scan_umac(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
lockdep_assert_held(&mvm->mutex);
uid_idx = iwl_mvm_find_free_scan_uid(mvm);
- if (uid_idx >= IWL_MVM_MAX_SIMULTANEOUS_SCANS)
+ if (uid_idx >= mvm->max_scans)
return -EBUSY;
/* we should have failed registration if scan_cmd was NULL */
@@ -1435,7 +1434,7 @@ int iwl_mvm_sched_scan_umac(struct iwl_mvm *mvm, struct ieee80211_vif *vif,
lockdep_assert_held(&mvm->mutex);
uid_idx = iwl_mvm_find_free_scan_uid(mvm);
- if (uid_idx >= IWL_MVM_MAX_SIMULTANEOUS_SCANS)
+ if (uid_idx >= mvm->max_scans)
return -EBUSY;
/* we should have failed registration if scan_cmd was NULL */
@@ -1536,7 +1535,7 @@ int iwl_mvm_rx_umac_scan_complete_notif(struct iwl_mvm *mvm,
/*
* Scan uid may be set to zero in case of scan abort request from above.
*/
- if (uid_idx >= IWL_MVM_MAX_SIMULTANEOUS_SCANS)
+ if (uid_idx >= mvm->max_scans)
return 0;
IWL_DEBUG_SCAN(mvm,
@@ -1577,7 +1576,7 @@ static bool iwl_scan_umac_done_check(struct iwl_notif_wait_data *notif_wait,
if (WARN_ON(pkt->hdr.cmd != SCAN_COMPLETE_UMAC))
return false;
- if (uid_idx >= IWL_MVM_MAX_SIMULTANEOUS_SCANS)
+ if (uid_idx >= scan_done->mvm->max_scans)
return false;
/*
@@ -1626,7 +1625,7 @@ static int iwl_umac_scan_stop(struct iwl_mvm *mvm,
IWL_DEBUG_SCAN(mvm, "Preparing to stop scan, type %x\n", type);
- for (i = 0; i < IWL_MVM_MAX_SIMULTANEOUS_SCANS; i++) {
+ for (i = 0; i < mvm->max_scans; i++) {
if (mvm->scan_uid[i] & type) {
int err;
@@ -1689,13 +1688,13 @@ void iwl_mvm_report_scan_aborted(struct iwl_mvm *mvm)
u32 uid, i;
uid = iwl_mvm_find_first_scan(mvm, IWL_UMAC_SCAN_UID_REG_SCAN);
- if (uid < IWL_MVM_MAX_SIMULTANEOUS_SCANS) {
+ if (uid < mvm->max_scans) {
ieee80211_scan_completed(mvm->hw, true);
mvm->scan_uid[uid] = 0;
}
uid = iwl_mvm_find_first_scan(mvm,
IWL_UMAC_SCAN_UID_SCHED_SCAN);
- if (uid < IWL_MVM_MAX_SIMULTANEOUS_SCANS && !mvm->restart_fw) {
+ if (uid < mvm->max_scans && !mvm->restart_fw) {
ieee80211_sched_scan_stopped(mvm->hw);
mvm->scan_uid[uid] = 0;
}
@@ -1704,7 +1703,7 @@ void iwl_mvm_report_scan_aborted(struct iwl_mvm *mvm)
* UIDs to make sure there's nothing left there and warn if
* any is found.
*/
- for (i = 0; i < IWL_MVM_MAX_SIMULTANEOUS_SCANS; i++) {
+ for (i = 0; i < mvm->max_scans; i++) {
if (WARN_ONCE(mvm->scan_uid[i],
"UMAC scan UID %d was not cleaned\n",
mvm->scan_uid[i]))
--
2.1.0
--
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