Return-path: Received: from mail-pb0-f46.google.com ([209.85.160.46]:50043 "EHLO mail-pb0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752635Ab3ABWzy (ORCPT ); Wed, 2 Jan 2013 17:55:54 -0500 Received: by mail-pb0-f46.google.com with SMTP id wy7so8091336pbc.5 for ; Wed, 02 Jan 2013 14:55:53 -0800 (PST) From: Thomas Pedersen To: linville@tuxdriver.org Cc: j@w1.fi, linux-wireless@vger.kernel.org, johannes@sipsolutions.net, devel@lists.open80211s.org, Thomas Pedersen Subject: [PATCH v2 2/4] mac80211_hwsim: hrtimer beacon Date: Wed, 2 Jan 2013 14:55:17 -0800 Message-Id: <1357167319-13338-2-git-send-email-thomas@cozybit.com> (sfid-20130102_235559_702397_A59E51BD) In-Reply-To: <1357167319-13338-1-git-send-email-thomas@cozybit.com> References: <1357167319-13338-1-git-send-email-thomas@cozybit.com> Sender: linux-wireless-owner@vger.kernel.org List-ID: For testing various timing-sensitive protocols (power save, MBCA, etc.), a beacon accuracy of jiffies is not sufficient. A tasklet_hrtimer is used for the beacon since it runs the callback in soft-IRQ context with hrtimer resolution. Also handle BSS_CHANGED_BEACON_ENABLED for hwsim. Signed-off-by: Thomas Pedersen --- drivers/net/wireless/mac80211_hwsim.c | 66 ++++++++++++++++++++++----------- 1 file changed, 45 insertions(+), 21 deletions(-) diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c index 59761fb..bccd17c 100644 --- a/drivers/net/wireless/mac80211_hwsim.c +++ b/drivers/net/wireless/mac80211_hwsim.c @@ -333,11 +333,11 @@ struct mac80211_hwsim_data { int scan_chan_idx; struct ieee80211_channel *channel; - unsigned long beacon_int; /* in jiffies unit */ + u64 beacon_int /* beacon interval in us */; unsigned int rx_filter; bool started, idle, scanning; struct mutex mutex; - struct timer_list beacon_timer; + struct tasklet_hrtimer beacon_timer; enum ps_mode { PS_DISABLED, PS_ENABLED, PS_AUTO_POLL, PS_MANUAL_POLL } ps; @@ -897,7 +897,7 @@ static void mac80211_hwsim_stop(struct ieee80211_hw *hw) { struct mac80211_hwsim_data *data = hw->priv; data->started = false; - del_timer(&data->beacon_timer); + tasklet_hrtimer_cancel(&data->beacon_timer); wiphy_debug(hw->wiphy, "%s\n", __func__); } @@ -981,21 +981,31 @@ static void mac80211_hwsim_beacon_tx(void *arg, u8 *mac, rcu_dereference(vif->chanctx_conf)->def.chan); } - -static void mac80211_hwsim_beacon(unsigned long arg) +static enum hrtimer_restart +mac80211_hwsim_beacon(struct hrtimer *timer) { - struct ieee80211_hw *hw = (struct ieee80211_hw *) arg; - struct mac80211_hwsim_data *data = hw->priv; + struct tasklet_hrtimer *ttimer = container_of(timer, + struct tasklet_hrtimer, + timer); + struct mac80211_hwsim_data *data = container_of(ttimer, + struct mac80211_hwsim_data, + beacon_timer); + struct ieee80211_hw *hw = data->hw; + u64 bcn_int = data->beacon_int; + ktime_t next_bcn; if (!data->started) - return; + goto out; ieee80211_iterate_active_interfaces_atomic( hw, IEEE80211_IFACE_ITER_NORMAL, mac80211_hwsim_beacon_tx, hw); - data->beacon_timer.expires = jiffies + data->beacon_int; - add_timer(&data->beacon_timer); + next_bcn = ktime_add(hrtimer_get_expires(timer), + ns_to_ktime(bcn_int * 1000)); + tasklet_hrtimer_start(ttimer, next_bcn, HRTIMER_MODE_ABS); +out: + return HRTIMER_NORESTART; } static const char *hwsim_chantypes[] = { @@ -1033,9 +1043,12 @@ static int mac80211_hwsim_config(struct ieee80211_hw *hw, u32 changed) data->power_level = conf->power_level; if (!data->started || !data->beacon_int) - del_timer(&data->beacon_timer); - else - mod_timer(&data->beacon_timer, jiffies + data->beacon_int); + tasklet_hrtimer_cancel(&data->beacon_timer); + else if (!hrtimer_is_queued(&data->beacon_timer.timer)) { + tasklet_hrtimer_start(&data->beacon_timer, + ns_to_ktime(data->beacon_int * 1000), + HRTIMER_MODE_REL); + } return 0; } @@ -1085,12 +1098,22 @@ static void mac80211_hwsim_bss_info_changed(struct ieee80211_hw *hw, if (changed & BSS_CHANGED_BEACON_INT) { wiphy_debug(hw->wiphy, " BCNINT: %d\n", info->beacon_int); - data->beacon_int = 1024 * info->beacon_int / 1000 * HZ / 1000; - if (WARN_ON(!data->beacon_int)) - data->beacon_int = 1; - if (data->started) - mod_timer(&data->beacon_timer, - jiffies + data->beacon_int); + data->beacon_int = info->beacon_int * 1024; + } + + if (changed & BSS_CHANGED_BEACON_ENABLED) { + wiphy_debug(hw->wiphy, " BCN EN: %d\n", info->enable_beacon); + if (data->started && + !hrtimer_is_queued(&data->beacon_timer.timer) && + info->enable_beacon) { + if (WARN_ON(!data->beacon_int)) + data->beacon_int = 1000 * 1024; + tasklet_hrtimer_start(&data->beacon_timer, + ns_to_ktime(data->beacon_int * + 1000), + HRTIMER_MODE_REL); + } else if (!info->enable_beacon) + tasklet_hrtimer_cancel(&data->beacon_timer); } if (changed & BSS_CHANGED_ERP_CTS_PROT) { @@ -2371,8 +2394,9 @@ static int __init init_mac80211_hwsim(void) data->debugfs, data, &hwsim_fops_group); - setup_timer(&data->beacon_timer, mac80211_hwsim_beacon, - (unsigned long) hw); + tasklet_hrtimer_init(&data->beacon_timer, + mac80211_hwsim_beacon, + CLOCK_REALTIME, HRTIMER_MODE_ABS); list_add_tail(&data->list, &hwsim_radios); } -- 1.7.10.4