From: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
include/net/mac80211.h | 81 ++++++++++++++++++++++++++++++++++++++++++---
net/mac80211/agg-tx.c | 11 +++---
net/mac80211/cfg.c | 6 +++
net/mac80211/ieee80211_i.h | 1
net/mac80211/iface.c | 54 ++++++++++++++++++++++++++++++
net/mac80211/main.c | 5 ++
net/mac80211/tx.c | 38 ++++++++++++++++-----
net/mac80211/util.c | 48 +++++++++++++++++++++-----
8 files changed, 216 insertions(+), 28 deletions(-)
--- a/include/net/mac80211.h 2012-03-28 10:39:22.000000000 +0200
+++ b/include/net/mac80211.h 2012-03-28 10:40:04.000000000 +0200
@@ -93,9 +93,11 @@
* @IEEE80211_MAX_QUEUES: Maximum number of regular device queues.
*/
enum ieee80211_max_queues {
- IEEE80211_MAX_QUEUES = 4,
+ IEEE80211_MAX_QUEUES = 16,
};
+#define IEEE80211_INVAL_HW_QUEUE 0xff
+
/**
* enum ieee80211_ac_numbers - AC numbers as used in mac80211
* @IEEE80211_AC_VO: voice
@@ -520,7 +522,7 @@ struct ieee80211_tx_rate {
*
* @flags: transmit info flags, defined above
* @band: the band to transmit on (use for checking for races)
- * @reserved: reserved for future use
+ * @hw_queue: HW queue to put the frame on, skb_get_queue_mapping() gives the AC
* @ack_frame_id: internal frame ID for TX status, used internally
* @control: union for control data
* @status: union for status data
@@ -536,7 +538,7 @@ struct ieee80211_tx_info {
u32 flags;
u8 band;
- u8 reserved;
+ u8 hw_queue;
u16 ack_frame_id;
@@ -887,6 +889,8 @@ enum ieee80211_vif_flags {
* these need to be set (or cleared) when the interface is added
* or, if supported by the driver, the interface type is changed
* at runtime, mac80211 will never touch this field
+ * @hw_queue: hardware queue for each AC
+ * @cab_queue: content-after-beacon (DTIM beacon really) queue, AP mode only
* @drv_priv: data area for driver use, will always be aligned to
* sizeof(void *).
*/
@@ -895,7 +899,12 @@ struct ieee80211_vif {
struct ieee80211_bss_conf bss_conf;
u8 addr[ETH_ALEN];
bool p2p;
+
+ u8 cab_queue;
+ u8 hw_queue[IEEE80211_NUM_ACS];
+
u32 driver_flags;
+
/* must be last */
u8 drv_priv[0] __attribute__((__aligned__(sizeof(void *))));
};
@@ -1177,6 +1186,11 @@ enum sta_notify_cmd {
* @IEEE80211_HW_WANT_MONITOR_VIF: The driver would like to be informed of
* a virtual monitor interface when monitor interfaces are the only
* active interfaces.
+ *
+ * @IEEE80211_HW_QUEUE_CONTROL: The driver wants to control per-interface
+ * queue mapping in order to use different queues (not just one per AC)
+ * for different virtual interfaces. See the doc section on HW queue
+ * control for more details.
*/
enum ieee80211_hw_flags {
IEEE80211_HW_HAS_RATE_CONTROL = 1<<0,
@@ -1199,7 +1213,7 @@ enum ieee80211_hw_flags {
IEEE80211_HW_SUPPORTS_UAPSD = 1<<17,
IEEE80211_HW_REPORTS_TX_ACK_STATUS = 1<<18,
IEEE80211_HW_CONNECTION_MONITOR = 1<<19,
- /* reuse bit 20 */
+ IEEE80211_HW_QUEUE_CONTROL = 1<<20,
IEEE80211_HW_SUPPORTS_PER_STA_GTK = 1<<21,
IEEE80211_HW_AP_LINK_PS = 1<<22,
IEEE80211_HW_TX_AMPDU_SETUP_IN_HW = 1<<23,
@@ -1269,6 +1283,9 @@ enum ieee80211_hw_flags {
* @max_tx_aggregation_subframes: maximum number of subframes in an
* aggregate an HT driver will transmit, used by the peer as a
* hint to size its reorder buffer.
+ *
+ * @offchannel_tx_hw_queue: HW queue ID to use for offchannel TX
+ * (if %IEEE80211_HW_QUEUE_CONTROL is set)
*/
struct ieee80211_hw {
struct ieee80211_conf conf;
@@ -1289,6 +1306,7 @@ struct ieee80211_hw {
u8 max_rate_tries;
u8 max_rx_aggregation_subframes;
u8 max_tx_aggregation_subframes;
+ u8 offchannel_tx_hw_queue;
};
/**
@@ -1697,6 +1715,61 @@ void ieee80211_free_txskb(struct ieee802
*/
/**
+ * DOC: HW queue control
+ *
+ * Before HW queue control was introduced, mac80211 only had a single static
+ * assignment of per-interface AC software queues to hardware queues. This
+ * was problematic for a few reasons:
+ * 1) off-channel transmissions might get stuck behind other frames
+ * 2) multiple virtual interfaces couldn't be handled correctly
+ * 3) after-DTIM frames could get stuck behind other frames
+ *
+ * To solve this, hardware typically uses multiple different queues for all
+ * the different usages, and this needs to be propagated into mac80211 so it
+ * won't have the same problem with the software queues.
+ *
+ * Therefore, mac80211 now offers the %IEEE80211_HW_QUEUE_CONTROL capability
+ * flag that tells it that the driver implements its own queue control. To do
+ * so, the driver will set up the various queues in each &struct ieee80211_vif
+ * and the offchannel queue in &struct ieee80211_hw. In response, mac80211 will
+ * use those queue IDs in the hw_queue field of &struct ieee80211_tx_info and
+ * if necessary will queue the frame on the right software queue that mirrors
+ * the hardware queue.
+ * Additionally, the driver has to then use these HW queue IDs for the queue
+ * management functions (ieee80211_stop_queue() et al.)
+ *
+ * The driver is free to set up the queue mappings as needed, multiple virtual
+ * interfaces may map to the same hardware queues if needed. The setup has to
+ * happen during add_interface or change_interface callbacks. For example, a
+ * driver supporting station+station and station+AP modes might decide to have
+ * 10 hardware queues to handle different scenarios:
+ *
+ * 4 AC HW queues for 1st vif: 0, 1, 2, 3
+ * 4 AC HW queues for 2nd vif: 4, 5, 6, 7
+ * after-DTIM queue for AP: 8
+ * off-channel queue: 9
+ *
+ * It would then set up the hardware like this:
+ * hw.offchannel_tx_hw_queue = 9
+ *
+ * and the first virtual interface that is added as follows:
+ * vif.hw_queue[IEEE80211_AC_VO] = 0
+ * vif.hw_queue[IEEE80211_AC_VI] = 1
+ * vif.hw_queue[IEEE80211_AC_BE] = 2
+ * vif.hw_queue[IEEE80211_AC_BK] = 3
+ * vif.cab_queue = 8 // if AP mode, otherwise %IEEE80211_INVAL_HW_QUEUE
+ * and the second virtual interface with 4-7.
+ *
+ * If queue 6 gets full, for example, mac80211 would only stop the second
+ * virtual interface's BE queue since virtual interface queues are per AC.
+ *
+ * Note that the vif.cab_queue value should be set to %IEEE80211_INVAL_HW_QUEUE
+ * whenever the queue is not used (i.e. the interface is not in AP mode) if the
+ * queue could potentially be shared since mac80211 will look at cab_queue when
+ * a queue is stopped/woken even if the interface is not in AP mode.
+ */
+
+/**
* enum ieee80211_filter_flags - hardware filter flags
*
* These flags determine what the filter in hardware should be
--- a/net/mac80211/iface.c 2012-03-28 10:39:38.000000000 +0200
+++ b/net/mac80211/iface.c 2012-03-28 10:48:48.000000000 +0200
@@ -149,6 +149,26 @@ static int ieee80211_check_concurrent_if
return 0;
}
+static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
+{
+ int i;
+
+ for (i = 0; i < IEEE80211_NUM_ACS; i++)
+ if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
+ IEEE80211_INVAL_HW_QUEUE))
+ return -EINVAL;
+
+ if (WARN_ON_ONCE(sdata->vif.type == NL80211_IFTYPE_AP &&
+ sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
+ return -EINVAL;
+
+ if (WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP &&
+ sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE))
+ return -EINVAL;
+
+ return 0;
+}
+
void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
const int offset)
{
@@ -169,6 +189,20 @@ void ieee80211_adjust_monitor_flags(stru
#undef ADJUST
}
+static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
+{
+ struct ieee80211_local *local = sdata->local;
+ int i;
+
+ for (i = 0; i < IEEE80211_NUM_ACS; i++) {
+ if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
+ sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
+ else
+ sdata->vif.hw_queue[i] = i;
+ }
+ sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
+}
+
static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
{
struct ieee80211_sub_if_data *sdata;
@@ -190,6 +224,8 @@ static int ieee80211_add_virtual_monitor
snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
wiphy_name(local->hw.wiphy));
+ ieee80211_set_default_queues(sdata);
+
ret = drv_add_interface(local, sdata);
if (WARN_ON(ret)) {
/* ok .. stupid driver, it asked for this! */
@@ -197,6 +233,12 @@ static int ieee80211_add_virtual_monitor
return ret;
}
+ ret = ieee80211_check_queues(sdata);
+ if (ret) {
+ kfree(sdata);
+ return ret;
+ }
+
rcu_assign_pointer(local->monitor_sdata, sdata);
return 0;
@@ -344,6 +386,9 @@ static int ieee80211_do_open(struct net_
res = drv_add_interface(local, sdata);
if (res)
goto err_stop;
+ res = ieee80211_check_queues(sdata);
+ if (res)
+ goto err_stop;
}
if (sdata->vif.type == NL80211_IFTYPE_AP) {
@@ -1040,6 +1085,13 @@ static int ieee80211_runtime_change_ifty
if (ret)
type = sdata->vif.type;
+ /*
+ * Ignore return value here, there's not much we can do since
+ * the driver changed the interface type internally already.
+ * The warnings will hopefully make driver authors fix it :-)
+ */
+ ieee80211_check_queues(sdata);
+
ieee80211_setup_sdata(sdata, type);
err = ieee80211_do_open(sdata->dev, false);
@@ -1266,6 +1318,8 @@ int ieee80211_if_add(struct ieee80211_lo
sizeof(sdata->rc_rateidx_mcs_mask[i]));
}
+ ieee80211_set_default_queues(sdata);
+
/* setup type-dependent data */
ieee80211_setup_sdata(sdata, type);
--- a/net/mac80211/util.c 2012-03-28 10:39:22.000000000 +0200
+++ b/net/mac80211/util.c 2012-03-28 10:48:27.000000000 +0200
@@ -265,11 +265,36 @@ __le16 ieee80211_ctstoself_duration(stru
}
EXPORT_SYMBOL(ieee80211_ctstoself_duration);
+void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue)
+{
+ struct ieee80211_sub_if_data *sdata;
+
+ list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+ int ac;
+
+ if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
+ continue;
+
+ if (sdata->vif.cab_queue != IEEE80211_INVAL_HW_QUEUE &&
+ local->queue_stop_reasons[sdata->vif.cab_queue] != 0)
+ continue;
+
+ for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
+ int ac_queue = sdata->vif.hw_queue[ac];
+
+ if (ac_queue == queue ||
+ (sdata->vif.cab_queue == queue &&
+ local->queue_stop_reasons[ac_queue] == 0 &&
+ skb_queue_empty(&local->pending[ac_queue])))
+ netif_wake_subqueue(sdata->dev, ac);
+ }
+ }
+}
+
static void __ieee80211_wake_queue(struct ieee80211_hw *hw, int queue,
enum queue_stop_reason reason)
{
struct ieee80211_local *local = hw_to_local(hw);
- struct ieee80211_sub_if_data *sdata;
trace_wake_queue(local, queue, reason);
@@ -287,11 +312,7 @@ static void __ieee80211_wake_queue(struc
if (skb_queue_empty(&local->pending[queue])) {
rcu_read_lock();
- list_for_each_entry_rcu(sdata, &local->interfaces, list) {
- if (test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
- continue;
- netif_wake_subqueue(sdata->dev, queue);
- }
+ ieee80211_propagate_queue_wake(local, queue);
rcu_read_unlock();
} else
tasklet_schedule(&local->tx_pending_tasklet);
@@ -332,8 +353,15 @@ static void __ieee80211_stop_queue(struc
__set_bit(reason, &local->queue_stop_reasons[queue]);
rcu_read_lock();
- list_for_each_entry_rcu(sdata, &local->interfaces, list)
- netif_stop_subqueue(sdata->dev, queue);
+ list_for_each_entry_rcu(sdata, &local->interfaces, list) {
+ int ac;
+
+ for (ac = 0; ac < IEEE80211_NUM_ACS; ac++) {
+ if (sdata->vif.hw_queue[ac] == queue ||
+ sdata->vif.cab_queue == queue)
+ netif_stop_subqueue(sdata->dev, ac);
+ }
+ }
rcu_read_unlock();
}
@@ -360,8 +388,8 @@ void ieee80211_add_pending_skb(struct ie
{
struct ieee80211_hw *hw = &local->hw;
unsigned long flags;
- int queue = skb_get_queue_mapping(skb);
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ int queue = info->hw_queue;
if (WARN_ON(!info->control.vif)) {
kfree_skb(skb);
@@ -393,7 +421,7 @@ void ieee80211_add_pending_skbs_fn(struc
continue;
}
- queue = skb_get_queue_mapping(skb);
+ queue = info->hw_queue;
__ieee80211_stop_queue(hw, queue,
IEEE80211_QUEUE_STOP_REASON_SKB_ADD);
--- a/net/mac80211/tx.c 2012-03-28 10:39:22.000000000 +0200
+++ b/net/mac80211/tx.c 2012-03-28 10:50:14.000000000 +0200
@@ -400,6 +400,8 @@ ieee80211_tx_h_multicast_ps_buf(struct i
return TX_CONTINUE;
info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
+ if (tx->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
+ info->hw_queue = tx->sdata->vif.cab_queue;
/* device releases frame after DTIM beacon */
if (!(tx->local->hw.flags & IEEE80211_HW_HOST_BROADCAST_PS_BUFFERING))
@@ -1215,11 +1217,19 @@ static bool ieee80211_tx_frags(struct ie
bool txpending)
{
struct sk_buff *skb, *tmp;
- struct ieee80211_tx_info *info;
unsigned long flags;
skb_queue_walk_safe(skbs, skb, tmp) {
- int q = skb_get_queue_mapping(skb);
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ int q = info->hw_queue;
+
+#ifdef CONFIG_MAC80211_VERBOSE_DEBUG
+ if (WARN_ON_ONCE(q >= local->hw.queues)) {
+ __skb_unlink(skb, skbs);
+ dev_kfree_skb(skb);
+ continue;
+ }
+#endif
spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
if (local->queue_stop_reasons[q] ||
@@ -1241,7 +1251,6 @@ static bool ieee80211_tx_frags(struct ie
}
spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
- info = IEEE80211_SKB_CB(skb);
info->control.vif = vif;
info->control.sta = sta;
@@ -1285,9 +1294,14 @@ static bool __ieee80211_tx(struct ieee80
switch (sdata->vif.type) {
case NL80211_IFTYPE_MONITOR:
sdata = rcu_dereference(local->monitor_sdata);
- if (sdata)
+ if (sdata) {
vif = &sdata->vif;
- else
+ info->hw_queue =
+ vif->hw_queue[skb_get_queue_mapping(skb)];
+ } else if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL) {
+ dev_kfree_skb(skb);
+ return true;
+ } else
vif = NULL;
break;
case NL80211_IFTYPE_AP_VLAN:
@@ -1403,6 +1417,12 @@ static bool ieee80211_tx(struct ieee8021
tx.channel = local->hw.conf.channel;
info->band = tx.channel->band;
+ /* set up hw_queue value early */
+ if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
+ !(local->hw.flags & IEEE80211_HW_QUEUE_CONTROL))
+ info->hw_queue =
+ sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
+
if (!invoke_tx_handlers(&tx))
result = __ieee80211_tx(local, &tx.skbs, led_len,
tx.sta, txpending);
@@ -2173,7 +2193,6 @@ static bool ieee80211_tx_pending_skb(str
void ieee80211_tx_pending(unsigned long data)
{
struct ieee80211_local *local = (struct ieee80211_local *)data;
- struct ieee80211_sub_if_data *sdata;
unsigned long flags;
int i;
bool txok;
@@ -2210,8 +2229,7 @@ void ieee80211_tx_pending(unsigned long
}
if (skb_queue_empty(&local->pending[i]))
- list_for_each_entry_rcu(sdata, &local->interfaces, list)
- netif_wake_subqueue(sdata->dev, i);
+ ieee80211_propagate_queue_wake(local, i);
}
spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
@@ -2713,11 +2731,13 @@ EXPORT_SYMBOL(ieee80211_get_buffered_bc)
void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata,
struct sk_buff *skb, int tid)
{
+ int ac = ieee802_1d_to_ac[tid];
+
skb_set_mac_header(skb, 0);
skb_set_network_header(skb, 0);
skb_set_transport_header(skb, 0);
- skb_set_queue_mapping(skb, ieee802_1d_to_ac[tid]);
+ skb_set_queue_mapping(skb, ac);
skb->priority = tid;
/*
--- a/net/mac80211/agg-tx.c 2012-03-28 10:39:22.000000000 +0200
+++ b/net/mac80211/agg-tx.c 2012-03-28 10:48:27.000000000 +0200
@@ -314,10 +314,11 @@ ieee80211_wake_queue_agg(struct ieee8021
* requires a call to ieee80211_agg_splice_finish later
*/
static void __acquires(agg_queue)
-ieee80211_agg_splice_packets(struct ieee80211_local *local,
+ieee80211_agg_splice_packets(struct ieee80211_sub_if_data *sdata,
struct tid_ampdu_tx *tid_tx, u16 tid)
{
- int queue = ieee80211_ac_from_tid(tid);
+ struct ieee80211_local *local = sdata->local;
+ int queue = sdata->vif.hw_queue[ieee80211_ac_from_tid(tid)];
unsigned long flags;
ieee80211_stop_queue_agg(local, tid);
@@ -376,7 +377,7 @@ void ieee80211_tx_ba_session_handle_star
" tid %d\n", tid);
#endif
spin_lock_bh(&sta->lock);
- ieee80211_agg_splice_packets(local, tid_tx, tid);
+ ieee80211_agg_splice_packets(sdata, tid_tx, tid);
ieee80211_assign_tid_tx(sta, tid, NULL);
ieee80211_agg_splice_finish(local, tid);
spin_unlock_bh(&sta->lock);
@@ -586,7 +587,7 @@ static void ieee80211_agg_tx_operational
*/
spin_lock_bh(&sta->lock);
- ieee80211_agg_splice_packets(local, tid_tx, tid);
+ ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid);
/*
* Now mark as operational. This will be visible
* in the TX path, and lets it go lock-free in
@@ -778,7 +779,7 @@ void ieee80211_stop_tx_ba_cb(struct ieee
* more.
*/
- ieee80211_agg_splice_packets(local, tid_tx, tid);
+ ieee80211_agg_splice_packets(sta->sdata, tid_tx, tid);
/* future packets must not find the tid_tx struct any more */
ieee80211_assign_tid_tx(sta, tid, NULL);
--- a/net/mac80211/cfg.c 2012-03-28 10:39:22.000000000 +0200
+++ b/net/mac80211/cfg.c 2012-03-28 10:48:27.000000000 +0200
@@ -2098,6 +2098,10 @@ static int ieee80211_mgmt_tx(struct wiph
IEEE80211_SKB_CB(skb)->flags = flags;
+ if (flags & IEEE80211_TX_CTL_TX_OFFCHAN)
+ IEEE80211_SKB_CB(skb)->hw_queue =
+ local->hw.offchannel_tx_hw_queue;
+
skb->dev = sdata->dev;
*cookie = (unsigned long) skb;
@@ -2139,6 +2143,8 @@ static int ieee80211_mgmt_tx(struct wiph
/* modify cookie to prevent API mismatches */
*cookie ^= 2;
IEEE80211_SKB_CB(skb)->flags |= IEEE80211_TX_CTL_TX_OFFCHAN;
+ IEEE80211_SKB_CB(skb)->hw_queue =
+ local->hw.offchannel_tx_hw_queue;
local->hw_roc_skb = skb;
local->hw_roc_skb_for_status = skb;
mutex_unlock(&local->mtx);
--- a/net/mac80211/ieee80211_i.h 2012-03-28 10:39:22.000000000 +0200
+++ b/net/mac80211/ieee80211_i.h 2012-03-28 10:40:04.000000000 +0200
@@ -1426,6 +1426,7 @@ void ieee80211_wake_queue_by_reason(stru
enum queue_stop_reason reason);
void ieee80211_stop_queue_by_reason(struct ieee80211_hw *hw, int queue,
enum queue_stop_reason reason);
+void ieee80211_propagate_queue_wake(struct ieee80211_local *local, int queue);
void ieee80211_add_pending_skb(struct ieee80211_local *local,
struct sk_buff *skb);
void ieee80211_add_pending_skbs_fn(struct ieee80211_local *local,
--- a/net/mac80211/main.c 2012-03-28 10:29:08.000000000 +0200
+++ b/net/mac80211/main.c 2012-03-28 10:48:27.000000000 +0200
@@ -594,6 +594,7 @@ struct ieee80211_hw *ieee80211_alloc_hw(
local->hw.max_report_rates = 0;
local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
+ local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
local->user_power_level = -1;
@@ -690,6 +691,10 @@ int ieee80211_register_hw(struct ieee802
WLAN_CIPHER_SUITE_AES_CMAC
};
+ if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
+ local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE)
+ return -EINVAL;
+
if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns)
#ifdef CONFIG_PM
&& (!local->ops->suspend || !local->ops->resume)
--
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