Less than a handful of changes:

* possible memory leak fix in hwsim
  * speed up hwsim
  * add hwsim userspace rate control API
  * code cleanups
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Merge tag 'mac80211-next-for-davem-2018-01-22' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211-next

Johannes Berg says:

====================
Less than a handful of changes:
 * possible memory leak fix in hwsim
 * speed up hwsim
 * add hwsim userspace rate control API
 * code cleanups
====================

A conflict was resolved in mac80211_hwsim.c, mostly of
the simple overlapping changes category.  One adding
a rhashtable and another adding a workqueue.

Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/wireless/mac80211_hwsim.c

@@ -32,6 +32,7 @@
 #include <net/genetlink.h>
 #include <net/net_namespace.h>
 #include <net/netns/generic.h>
+#include <linux/rhashtable.h>
 #include "mac80211_hwsim.h"
 
 #define WARN_QUEUE 100
@@ -490,6 +491,7 @@ static const struct ieee80211_iface_combination hwsim_if_comb_p2p_dev[] = {
 static spinlock_t hwsim_radio_lock;
 static LIST_HEAD(hwsim_radios);
 static struct workqueue_struct *hwsim_wq;
+static struct rhashtable hwsim_radios_rht;
 static int hwsim_radio_idx;
 
 static struct platform_driver mac80211_hwsim_driver = {
@@ -500,6 +502,7 @@ static struct platform_driver mac80211_hwsim_driver = {
 
 struct mac80211_hwsim_data {
 	struct list_head list;
+	struct rhash_head rht;
 	struct ieee80211_hw *hw;
 	struct device *dev;
 	struct ieee80211_supported_band bands[NUM_NL80211_BANDS];
@@ -574,6 +577,13 @@ struct mac80211_hwsim_data {
 	u64 tx_failed;
 };
 
+static const struct rhashtable_params hwsim_rht_params = {
+	.nelem_hint = 2,
+	.automatic_shrinking = true,
+	.key_len = ETH_ALEN,
+	.key_offset = offsetof(struct mac80211_hwsim_data, addresses[1]),
+	.head_offset = offsetof(struct mac80211_hwsim_data, rht),
+};
 
 struct hwsim_radiotap_hdr {
 	struct ieee80211_radiotap_header hdr;
@@ -1009,6 +1019,36 @@ static int hwsim_unicast_netgroup(struct mac80211_hwsim_data *data,
 	return res;
 }
 
+static inline u16 trans_tx_rate_flags_ieee2hwsim(struct ieee80211_tx_rate *rate)
+{
+	u16 result = 0;
+
+	if (rate->flags & IEEE80211_TX_RC_USE_RTS_CTS)
+		result |= MAC80211_HWSIM_TX_RC_USE_RTS_CTS;
+	if (rate->flags & IEEE80211_TX_RC_USE_CTS_PROTECT)
+		result |= MAC80211_HWSIM_TX_RC_USE_CTS_PROTECT;
+	if (rate->flags & IEEE80211_TX_RC_USE_SHORT_PREAMBLE)
+		result |= MAC80211_HWSIM_TX_RC_USE_SHORT_PREAMBLE;
+	if (rate->flags & IEEE80211_TX_RC_MCS)
+		result |= MAC80211_HWSIM_TX_RC_MCS;
+	if (rate->flags & IEEE80211_TX_RC_GREEN_FIELD)
+		result |= MAC80211_HWSIM_TX_RC_GREEN_FIELD;
+	if (rate->flags & IEEE80211_TX_RC_40_MHZ_WIDTH)
+		result |= MAC80211_HWSIM_TX_RC_40_MHZ_WIDTH;
+	if (rate->flags & IEEE80211_TX_RC_DUP_DATA)
+		result |= MAC80211_HWSIM_TX_RC_DUP_DATA;
+	if (rate->flags & IEEE80211_TX_RC_SHORT_GI)
+		result |= MAC80211_HWSIM_TX_RC_SHORT_GI;
+	if (rate->flags & IEEE80211_TX_RC_VHT_MCS)
+		result |= MAC80211_HWSIM_TX_RC_VHT_MCS;
+	if (rate->flags & IEEE80211_TX_RC_80_MHZ_WIDTH)
+		result |= MAC80211_HWSIM_TX_RC_80_MHZ_WIDTH;
+	if (rate->flags & IEEE80211_TX_RC_160_MHZ_WIDTH)
+		result |= MAC80211_HWSIM_TX_RC_160_MHZ_WIDTH;
+
+	return result;
+}
+
 static void mac80211_hwsim_tx_frame_nl(struct ieee80211_hw *hw,
 				       struct sk_buff *my_skb,
 				       int dst_portid)
@@ -1021,6 +1061,7 @@ static void mac80211_hwsim_tx_frame_nl(struct ieee80211_hw *hw,
 	unsigned int hwsim_flags = 0;
 	int i;
 	struct hwsim_tx_rate tx_attempts[IEEE80211_TX_MAX_RATES];
+	struct hwsim_tx_rate_flag tx_attempts_flags[IEEE80211_TX_MAX_RATES];
 	uintptr_t cookie;
 
 	if (data->ps != PS_DISABLED)
@@ -1072,7 +1113,11 @@ static void mac80211_hwsim_tx_frame_nl(struct ieee80211_hw *hw,
 
 	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 		tx_attempts[i].idx = info->status.rates[i].idx;
+		tx_attempts_flags[i].idx = info->status.rates[i].idx;
 		tx_attempts[i].count = info->status.rates[i].count;
+		tx_attempts_flags[i].flags =
+				trans_tx_rate_flags_ieee2hwsim(
+						&info->status.rates[i]);
 	}
 
 	if (nla_put(skb, HWSIM_ATTR_TX_INFO,
@@ -1080,6 +1125,11 @@ static void mac80211_hwsim_tx_frame_nl(struct ieee80211_hw *hw,
 		    tx_attempts))
 		goto nla_put_failure;
 
+	if (nla_put(skb, HWSIM_ATTR_TX_INFO_FLAGS,
+		    sizeof(struct hwsim_tx_rate_flag) * IEEE80211_TX_MAX_RATES,
+		    tx_attempts_flags))
+		goto nla_put_failure;
+
 	/* We create a cookie to identify this skb */
 	data->pending_cookie++;
 	cookie = data->pending_cookie;
@@ -2732,6 +2782,15 @@ static int mac80211_hwsim_new_radio(struct genl_info *info,
 			     CLOCK_MONOTONIC, HRTIMER_MODE_ABS);
 
 	spin_lock_bh(&hwsim_radio_lock);
+	err = rhashtable_insert_fast(&hwsim_radios_rht, &data->rht,
+				     hwsim_rht_params);
+	if (err < 0) {
+		pr_debug("mac80211_hwsim: radio index %d already present\n",
+			 idx);
+		spin_unlock_bh(&hwsim_radio_lock);
+		goto failed_final_insert;
+	}
+
 	list_add_tail(&data->list, &hwsim_radios);
 	spin_unlock_bh(&hwsim_radio_lock);
 
@@ -2740,6 +2799,9 @@ static int mac80211_hwsim_new_radio(struct genl_info *info,
 
 	return idx;
 
+failed_final_insert:
+	debugfs_remove_recursive(data->debugfs);
+	ieee80211_unregister_hw(data->hw);
 failed_hw:
 	device_release_driver(data->dev);
 failed_bind:
@@ -2875,22 +2937,9 @@ static void hwsim_mon_setup(struct net_device *dev)
 
 static struct mac80211_hwsim_data *get_hwsim_data_ref_from_addr(const u8 *addr)
 {
-	struct mac80211_hwsim_data *data;
+	return rhashtable_lookup_fast(&hwsim_radios_rht,
-	bool _found = false;
+				      addr,
-
+				      hwsim_rht_params);
-	spin_lock_bh(&hwsim_radio_lock);
-	list_for_each_entry(data, &hwsim_radios, list) {
-		if (memcmp(data->addresses[1].addr, addr, ETH_ALEN) == 0) {
-			_found = true;
-			break;
-		}
-	}
-	spin_unlock_bh(&hwsim_radio_lock);
-
-	if (!_found)
-		return NULL;
-
-	return data;
 }
 
 static void hwsim_register_wmediumd(struct net *net, u32 portid)
@@ -2975,7 +3024,6 @@ static int hwsim_tx_info_frame_received_nl(struct sk_buff *skb_2,
 	for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
 		txi->status.rates[i].idx = tx_attempts[i].idx;
 		txi->status.rates[i].count = tx_attempts[i].count;
-		/*txi->status.rates[i].flags = 0;*/
 	}
 
 	txi->status.ack_signal = nla_get_u32(info->attrs[HWSIM_ATTR_SIGNAL]);
@@ -3155,8 +3203,10 @@ static int hwsim_new_radio_nl(struct sk_buff *msg, struct genl_info *info)
 	if (info->attrs[HWSIM_ATTR_REG_CUSTOM_REG]) {
 		u32 idx = nla_get_u32(info->attrs[HWSIM_ATTR_REG_CUSTOM_REG]);
 
-		if (idx >= ARRAY_SIZE(hwsim_world_regdom_custom))
+		if (idx >= ARRAY_SIZE(hwsim_world_regdom_custom)) {
+			kfree(hwname);
 			return -EINVAL;
+		}
 		param.regd = hwsim_world_regdom_custom[idx];
 	}
 
@@ -3197,6 +3247,8 @@ static int hwsim_del_radio_nl(struct sk_buff *msg, struct genl_info *info)
 			continue;
 
 		list_del(&data->list);
+		rhashtable_remove_fast(&hwsim_radios_rht, &data->rht,
+				       hwsim_rht_params);
 		spin_unlock_bh(&hwsim_radio_lock);
 		mac80211_hwsim_del_radio(data, wiphy_name(data->hw->wiphy),
 					 info);
@@ -3352,6 +3404,8 @@ static void remove_user_radios(u32 portid)
 	list_for_each_entry_safe(entry, tmp, &hwsim_radios, list) {
 		if (entry->destroy_on_close && entry->portid == portid) {
 			list_del(&entry->list);
+			rhashtable_remove_fast(&hwsim_radios_rht, &entry->rht,
+					       hwsim_rht_params);
 			INIT_WORK(&entry->destroy_work, destroy_radio);
 			queue_work(hwsim_wq, &entry->destroy_work);
 		}
@@ -3427,6 +3481,8 @@ static void __net_exit hwsim_exit_net(struct net *net)
 			continue;
 
 		list_del(&data->list);
+		rhashtable_remove_fast(&hwsim_radios_rht, &data->rht,
+				       hwsim_rht_params);
 		INIT_WORK(&data->destroy_work, destroy_radio);
 		queue_work(hwsim_wq, &data->destroy_work);
 	}
@@ -3463,6 +3519,7 @@ static int __init init_mac80211_hwsim(void)
 	hwsim_wq = alloc_workqueue("hwsim_wq",WQ_MEM_RECLAIM,0);
 	if (!hwsim_wq)
 		return -ENOMEM;
+	rhashtable_init(&hwsim_radios_rht, &hwsim_rht_params);
 
 	err = register_pernet_device(&hwsim_net_ops);
 	if (err)
@@ -3604,6 +3661,7 @@ static void __exit exit_mac80211_hwsim(void)
 	mac80211_hwsim_free();
 	flush_workqueue(hwsim_wq);
 
+	rhashtable_destroy(&hwsim_radios_rht);
 	unregister_netdev(hwsim_mon);
 	platform_driver_unregister(&mac80211_hwsim_driver);
 	unregister_pernet_device(&hwsim_net_ops);

drivers/net/wireless/mac80211_hwsim.h

@@ -64,7 +64,8 @@ enum hwsim_tx_control_flags {
  * @HWSIM_CMD_TX_INFO_FRAME: Transmission info report from user space to
  *	kernel, uses:
  *	%HWSIM_ATTR_ADDR_TRANSMITTER, %HWSIM_ATTR_FLAGS,
- *	%HWSIM_ATTR_TX_INFO, %HWSIM_ATTR_SIGNAL, %HWSIM_ATTR_COOKIE
+ *	%HWSIM_ATTR_TX_INFO, %WSIM_ATTR_TX_INFO_FLAGS,
+ *	%HWSIM_ATTR_SIGNAL, %HWSIM_ATTR_COOKIE
  * @HWSIM_CMD_NEW_RADIO: create a new radio with the given parameters,
  *	returns the radio ID (>= 0) or negative on errors, if successful
  *	then multicast the result
@@ -123,6 +124,8 @@ enum {
  * @HWSIM_ATTR_RADIO_NAME: Name of radio, e.g. phy666
  * @HWSIM_ATTR_NO_VIF:  Do not create vif (wlanX) when creating radio.
  * @HWSIM_ATTR_FREQ: Frequency at which packet is transmitted or received.
+ * @HWSIM_ATTR_TX_INFO_FLAGS: additional flags for corresponding
+ *	rates of %HWSIM_ATTR_TX_INFO
  * @__HWSIM_ATTR_MAX: enum limit
  */
 
@@ -149,6 +152,7 @@ enum {
 	HWSIM_ATTR_NO_VIF,
 	HWSIM_ATTR_FREQ,
 	HWSIM_ATTR_PAD,
+	HWSIM_ATTR_TX_INFO_FLAGS,
 	__HWSIM_ATTR_MAX,
 };
 #define HWSIM_ATTR_MAX (__HWSIM_ATTR_MAX - 1)
@@ -171,4 +175,66 @@ struct hwsim_tx_rate {
 	u8 count;
 } __packed;
 
+/**
+ * enum hwsim_tx_rate_flags - per-rate flags set by the rate control algorithm.
+ *	Inspired by structure mac80211_rate_control_flags. New flags may be
+ *	appended, but old flags not deleted, to keep compatibility for
+ *	userspace.
+ *
+ * These flags are set by the Rate control algorithm for each rate during tx,
+ * in the @flags member of struct ieee80211_tx_rate.
+ *
+ * @MAC80211_HWSIM_TX_RC_USE_RTS_CTS: Use RTS/CTS exchange for this rate.
+ * @MAC80211_HWSIM_TX_RC_USE_CTS_PROTECT: CTS-to-self protection is required.
+ *	This is set if the current BSS requires ERP protection.
+ * @MAC80211_HWSIM_TX_RC_USE_SHORT_PREAMBLE: Use short preamble.
+ * @MAC80211_HWSIM_TX_RC_MCS: HT rate.
+ * @MAC80211_HWSIM_TX_RC_VHT_MCS: VHT MCS rate, in this case the idx field is
+ *	split into a higher 4 bits (Nss) and lower 4 bits (MCS number)
+ * @MAC80211_HWSIM_TX_RC_GREEN_FIELD: Indicates whether this rate should be used
+ *	in Greenfield mode.
+ * @MAC80211_HWSIM_TX_RC_40_MHZ_WIDTH: Indicates if the Channel Width should be
+ *	40 MHz.
+ * @MAC80211_HWSIM_TX_RC_80_MHZ_WIDTH: Indicates 80 MHz transmission
+ * @MAC80211_HWSIM_TX_RC_160_MHZ_WIDTH: Indicates 160 MHz transmission
+ *	(80+80 isn't supported yet)
+ * @MAC80211_HWSIM_TX_RC_DUP_DATA: The frame should be transmitted on both of
+ *	the adjacent 20 MHz channels, if the current channel type is
+ *	NL80211_CHAN_HT40MINUS or NL80211_CHAN_HT40PLUS.
+ * @MAC80211_HWSIM_TX_RC_SHORT_GI: Short Guard interval should be used for this
+ *	rate.
+ */
+enum hwsim_tx_rate_flags {
+	MAC80211_HWSIM_TX_RC_USE_RTS_CTS		= BIT(0),
+	MAC80211_HWSIM_TX_RC_USE_CTS_PROTECT		= BIT(1),
+	MAC80211_HWSIM_TX_RC_USE_SHORT_PREAMBLE	= BIT(2),
+
+	/* rate index is an HT/VHT MCS instead of an index */
+	MAC80211_HWSIM_TX_RC_MCS			= BIT(3),
+	MAC80211_HWSIM_TX_RC_GREEN_FIELD		= BIT(4),
+	MAC80211_HWSIM_TX_RC_40_MHZ_WIDTH		= BIT(5),
+	MAC80211_HWSIM_TX_RC_DUP_DATA		= BIT(6),
+	MAC80211_HWSIM_TX_RC_SHORT_GI		= BIT(7),
+	MAC80211_HWSIM_TX_RC_VHT_MCS			= BIT(8),
+	MAC80211_HWSIM_TX_RC_80_MHZ_WIDTH		= BIT(9),
+	MAC80211_HWSIM_TX_RC_160_MHZ_WIDTH		= BIT(10),
+};
+
+/**
+ * struct hwsim_tx_rate - rate selection/status
+ *
+ * @idx: rate index to attempt to send with
+ * @count: number of tries in this rate before going to the next rate
+ *
+ * A value of -1 for @idx indicates an invalid rate and, if used
+ * in an array of retry rates, that no more rates should be tried.
+ *
+ * When used for transmit status reporting, the driver should
+ * always report the rate and number of retries used.
+ *
+ */
+struct hwsim_tx_rate_flag {
+	s8 idx;
+	u16 flags;
+} __packed;
 #endif /* __MAC80211_HWSIM_H */

net/mac80211/debugfs_sta.c

@@ -420,7 +420,7 @@ static ssize_t sta_vht_capa_read(struct file *file, char __user *userbuf,
 		default:
 			p += scnprintf(p, sizeof(buf) + buf - p,
 				       "\t\tMAX-MPDU-UNKNOWN\n");
-		};
+		}
 		switch (vhtc->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK) {
 		case 0:
 			p += scnprintf(p, sizeof(buf) + buf - p,
@@ -438,7 +438,7 @@ static ssize_t sta_vht_capa_read(struct file *file, char __user *userbuf,
 			p += scnprintf(p, sizeof(buf) + buf - p,
 				       "\t\tUNKNOWN-MHZ: 0x%x\n",
 				       (vhtc->cap >> 2) & 0x3);
-		};
+		}
 		PFLAG(RXLDPC, "RXLDPC");
 		PFLAG(SHORT_GI_80, "SHORT-GI-80");
 		PFLAG(SHORT_GI_160, "SHORT-GI-160");