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We have three more fixes:

Browse source 
* AP_VLAN tailroom calculation fix, the bug leads to warnings
    along with dropped packets
  * NAPI context issue, calling napi_gro_receive() from a timer
    (obviously) can lead to crashes
  * remain-on-channel combining leads to dropped requests and not
    being able to finish certain operations, so remove it
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Merge tag 'mac80211-for-davem-2015-05-26' of git://git.kernel.org/pub/scm/linux/kernel/git/jberg/mac80211

Johannes Berg says:

====================
We have three more fixes:
 * AP_VLAN tailroom calculation fix, the bug leads to warnings
   along with dropped packets
 * NAPI context issue, calling napi_gro_receive() from a timer
   (obviously) can lead to crashes
 * remain-on-channel combining leads to dropped requests and not
   being able to finish certain operations, so remove it
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2015-05-26 19:38:53 -04:00
parent 5f59102fdc f9dca80b98
commit fe9066ade6
7 changed files with 100 additions and 65 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

59
net/mac80211/cfg.c
View file

@ -2495,51 +2495,22 @@ static bool ieee80211_coalesce_started_roc(struct ieee80211_local *local,
struct ieee80211_roc_work *new_roc,
struct ieee80211_roc_work *cur_roc)
{
unsigned long j = jiffies;
unsigned long cur_roc_end = cur_roc->hw_start_time +
msecs_to_jiffies(cur_roc->duration);
struct ieee80211_roc_work *next_roc;
int new_dur;
unsigned long now = jiffies;
unsigned long remaining = cur_roc->hw_start_time +
msecs_to_jiffies(cur_roc->duration) -
now;
if (WARN_ON(!cur_roc->started || !cur_roc->hw_begun))
return false;
if (time_after(j + IEEE80211_ROC_MIN_LEFT, cur_roc_end))
/* if it doesn't fit entirely, schedule a new one */
if (new_roc->duration > jiffies_to_msecs(remaining))
return false;
ieee80211_handle_roc_started(new_roc);
new_dur = new_roc->duration - jiffies_to_msecs(cur_roc_end - j);
/* cur_roc is long enough - add new_roc to the dependents list. */
if (new_dur <= 0) {
list_add_tail(&new_roc->list, &cur_roc->dependents);
return true;
}
new_roc->duration = new_dur;
/*
* if cur_roc was already coalesced before, we might
* want to extend the next roc instead of adding
* a new one.
*/
next_roc = list_entry(cur_roc->list.next,
struct ieee80211_roc_work, list);
if (&next_roc->list != &local->roc_list &&
next_roc->chan == new_roc->chan &&
next_roc->sdata == new_roc->sdata &&
!WARN_ON(next_roc->started)) {
list_add_tail(&new_roc->list, &next_roc->dependents);
next_roc->duration = max(next_roc->duration,
new_roc->duration);
next_roc->type = max(next_roc->type, new_roc->type);
return true;
}
/* add right after cur_roc */
list_add(&new_roc->list, &cur_roc->list);
/* add to dependents so we send the expired event properly */
list_add_tail(&new_roc->list, &cur_roc->dependents);
return true;
}
@ -2652,17 +2623,9 @@ static int ieee80211_start_roc_work(struct ieee80211_local *local,
* In the offloaded ROC case, if it hasn't begun, add
* this new one to the dependent list to be handled
* when the master one begins. If it has begun,
* check that there's still a minimum time left and
* if so, start this one, transmitting the frame, but
* add it to the list directly after this one with
* a reduced time so we'll ask the driver to execute
* it right after finishing the previous one, in the
* hope that it'll also be executed right afterwards,
* effectively extending the old one.
* If there's no minimum time left, just add it to the
* normal list.
* TODO: the ROC type is ignored here, assuming that it
* is better to immediately use the current ROC.
* check if it fits entirely within the existing one,
* in which case it will just be dependent as well.
* Otherwise, schedule it by itself.
*/
if (!tmp->hw_begun) {
list_add_tail(&roc->list, &tmp->dependents);

9
net/mac80211/ieee80211_i.h
View file

@ -205,6 +205,8 @@ enum ieee80211_packet_rx_flags {
* @IEEE80211_RX_CMNTR: received on cooked monitor already
* @IEEE80211_RX_BEACON_REPORTED: This frame was already reported
* to cfg80211_report_obss_beacon().
* @IEEE80211_RX_REORDER_TIMER: this frame is released by the
* reorder buffer timeout timer, not the normal RX path
*
* These flags are used across handling multiple interfaces
* for a single frame.
@ -212,6 +214,7 @@ enum ieee80211_packet_rx_flags {
enum ieee80211_rx_flags {
IEEE80211_RX_CMNTR = BIT(0),
IEEE80211_RX_BEACON_REPORTED = BIT(1),
IEEE80211_RX_REORDER_TIMER = BIT(2),
};
struct ieee80211_rx_data {
@ -325,12 +328,6 @@ struct mesh_preq_queue {
u8 flags;
};
#if HZ/100 == 0
#define IEEE80211_ROC_MIN_LEFT 1
#else
#define IEEE80211_ROC_MIN_LEFT (HZ/100)
#endif
struct ieee80211_roc_work {
struct list_head list;
struct list_head dependents;

6
net/mac80211/iface.c
View file

@ -522,6 +522,12 @@ int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
sizeof(sdata->vif.hw_queue));
sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
mutex_lock(&local->key_mtx);
sdata->crypto_tx_tailroom_needed_cnt +=
master->crypto_tx_tailroom_needed_cnt;
mutex_unlock(&local->key_mtx);
break;
}
case NL80211_IFTYPE_AP:

82
net/mac80211/key.c
View file

@ -58,6 +58,22 @@ static void assert_key_lock(struct ieee80211_local *local)
lockdep_assert_held(&local->key_mtx);
}
static void
update_vlan_tailroom_need_count(struct ieee80211_sub_if_data *sdata, int delta)
{
struct ieee80211_sub_if_data *vlan;
if (sdata->vif.type != NL80211_IFTYPE_AP)
return;
mutex_lock(&sdata->local->mtx);
list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
vlan->crypto_tx_tailroom_needed_cnt += delta;
mutex_unlock(&sdata->local->mtx);
}
static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
{
/*
@ -79,6 +95,8 @@ static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
* http://mid.gmane.org/1308590980.4322.19.camel@jlt3.sipsolutions.net
*/
update_vlan_tailroom_need_count(sdata, 1);
if (!sdata->crypto_tx_tailroom_needed_cnt++) {
/*
* Flush all XMIT packets currently using HW encryption or no
@ -88,6 +106,15 @@ static void increment_tailroom_need_count(struct ieee80211_sub_if_data *sdata)
}
}
static void decrease_tailroom_need_count(struct ieee80211_sub_if_data *sdata,
int delta)
{
WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt < delta);
update_vlan_tailroom_need_count(sdata, -delta);
sdata->crypto_tx_tailroom_needed_cnt -= delta;
}
static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
{
struct ieee80211_sub_if_data *sdata;
@ -144,7 +171,7 @@ static int ieee80211_key_enable_hw_accel(struct ieee80211_key *key)
if (!((key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) ||
(key->conf.flags & IEEE80211_KEY_FLAG_RESERVE_TAILROOM)))
sdata->crypto_tx_tailroom_needed_cnt--;
decrease_tailroom_need_count(sdata, 1);
WARN_ON((key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
(key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV));
@ -541,7 +568,7 @@ static void __ieee80211_key_destroy(struct ieee80211_key *key,
schedule_delayed_work(&sdata->dec_tailroom_needed_wk,
HZ/2);
} else {
sdata->crypto_tx_tailroom_needed_cnt--;
decrease_tailroom_need_count(sdata, 1);
}
}
@ -631,6 +658,7 @@ void ieee80211_key_free(struct ieee80211_key *key, bool delay_tailroom)
void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_key *key;
struct ieee80211_sub_if_data *vlan;
ASSERT_RTNL();
@ -639,7 +667,14 @@ void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
mutex_lock(&sdata->local->key_mtx);
sdata->crypto_tx_tailroom_needed_cnt = 0;
WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
sdata->crypto_tx_tailroom_pending_dec);
if (sdata->vif.type == NL80211_IFTYPE_AP) {
list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
vlan->crypto_tx_tailroom_pending_dec);
}
list_for_each_entry(key, &sdata->key_list, list) {
increment_tailroom_need_count(sdata);
@ -649,6 +684,22 @@ void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata)
mutex_unlock(&sdata->local->key_mtx);
}
void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata)
{
struct ieee80211_sub_if_data *vlan;
mutex_lock(&sdata->local->key_mtx);
sdata->crypto_tx_tailroom_needed_cnt = 0;
if (sdata->vif.type == NL80211_IFTYPE_AP) {
list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
vlan->crypto_tx_tailroom_needed_cnt = 0;
}
mutex_unlock(&sdata->local->key_mtx);
}
void ieee80211_iter_keys(struct ieee80211_hw *hw,
struct ieee80211_vif *vif,
void (*iter)(struct ieee80211_hw *hw,
@ -688,8 +739,8 @@ static void ieee80211_free_keys_iface(struct ieee80211_sub_if_data *sdata,
{
struct ieee80211_key *key, *tmp;
sdata->crypto_tx_tailroom_needed_cnt -=
sdata->crypto_tx_tailroom_pending_dec;
decrease_tailroom_need_count(sdata,
sdata->crypto_tx_tailroom_pending_dec);
sdata->crypto_tx_tailroom_pending_dec = 0;
ieee80211_debugfs_key_remove_mgmt_default(sdata);
@ -709,6 +760,7 @@ void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
{
struct ieee80211_local *local = sdata->local;
struct ieee80211_sub_if_data *vlan;
struct ieee80211_sub_if_data *master;
struct ieee80211_key *key, *tmp;
LIST_HEAD(keys);
@ -728,8 +780,20 @@ void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
list_for_each_entry_safe(key, tmp, &keys, list)
__ieee80211_key_destroy(key, false);
WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
sdata->crypto_tx_tailroom_pending_dec);
if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
if (sdata->bss) {
master = container_of(sdata->bss,
struct ieee80211_sub_if_data,
u.ap);
WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt !=
master->crypto_tx_tailroom_needed_cnt);
}
} else {
WARN_ON_ONCE(sdata->crypto_tx_tailroom_needed_cnt ||
sdata->crypto_tx_tailroom_pending_dec);
}
if (sdata->vif.type == NL80211_IFTYPE_AP) {
list_for_each_entry(vlan, &sdata->u.ap.vlans, u.vlan.list)
WARN_ON_ONCE(vlan->crypto_tx_tailroom_needed_cnt ||
@ -793,8 +857,8 @@ void ieee80211_delayed_tailroom_dec(struct work_struct *wk)
*/
mutex_lock(&sdata->local->key_mtx);
sdata->crypto_tx_tailroom_needed_cnt -=
sdata->crypto_tx_tailroom_pending_dec;
decrease_tailroom_need_count(sdata,
sdata->crypto_tx_tailroom_pending_dec);
sdata->crypto_tx_tailroom_pending_dec = 0;
mutex_unlock(&sdata->local->key_mtx);
}

1
net/mac80211/key.h
View file

@ -161,6 +161,7 @@ void ieee80211_free_keys(struct ieee80211_sub_if_data *sdata,
void ieee80211_free_sta_keys(struct ieee80211_local *local,
struct sta_info *sta);
void ieee80211_enable_keys(struct ieee80211_sub_if_data *sdata);
void ieee80211_reset_crypto_tx_tailroom(struct ieee80211_sub_if_data *sdata);
#define key_mtx_dereference(local, ref) \
rcu_dereference_protected(ref, lockdep_is_held(&((local)->key_mtx)))

5
net/mac80211/rx.c
View file

@ -2121,7 +2121,8 @@ ieee80211_deliver_skb(struct ieee80211_rx_data *rx)
/* deliver to local stack */
skb->protocol = eth_type_trans(skb, dev);
memset(skb->cb, 0, sizeof(skb->cb));
if (rx->local->napi)
if (!(rx->flags & IEEE80211_RX_REORDER_TIMER) &&
rx->local->napi)
napi_gro_receive(rx->local->napi, skb);
else
netif_receive_skb(skb);
@ -3231,7 +3232,7 @@ void ieee80211_release_reorder_timeout(struct sta_info *sta, int tid)
/* This is OK -- must be QoS data frame */
.security_idx = tid,
.seqno_idx = tid,
.flags = 0,
.flags = IEEE80211_RX_REORDER_TIMER,
};
struct tid_ampdu_rx *tid_agg_rx;

3
net/mac80211/util.c
View file

@ -2022,6 +2022,9 @@ int ieee80211_reconfig(struct ieee80211_local *local)
mutex_unlock(&local->sta_mtx);
/* add back keys */
list_for_each_entry(sdata, &local->interfaces, list)
ieee80211_reset_crypto_tx_tailroom(sdata);
list_for_each_entry(sdata, &local->interfaces, list)
if (ieee80211_sdata_running(sdata))
ieee80211_enable_keys(sdata);