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Miller" , devicetree@vger.kernel.org, Rob Herring , =?utf-8?b?SsOpcsO0bWUgUG91aWxsZXI=?= Subject: [PATCH 16/23] wfx: add queue.c/queue.h Date: Mon, 12 Oct 2020 12:46:41 +0200 Message-Id: <20201012104648.985256-17-Jerome.Pouiller@silabs.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201012104648.985256-1-Jerome.Pouiller@silabs.com> References: <20201012104648.985256-1-Jerome.Pouiller@silabs.com> X-Originating-IP: [82.67.86.106] X-ClientProxiedBy: PR3P189CA0005.EURP189.PROD.OUTLOOK.COM (2603:10a6:102:52::10) To SN6PR11MB2718.namprd11.prod.outlook.com (2603:10b6:805:63::18) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from pc-42.home (82.67.86.106) by PR3P189CA0005.EURP189.PROD.OUTLOOK.COM (2603:10a6:102:52::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3455.21 via Frontend Transport; Mon, 12 Oct 2020 10:47:34 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: dda3d1fe-a4e4-419d-364e-08d86e9c3afe X-MS-TrafficTypeDiagnostic: SA0PR11MB4734: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:4714; X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 7MN8O//iB9XPxJLndgAbVygbbQJTXmYDVd/LLFQNpHNj0BkOPzDCHpX8cPQqp2n2hxuBFeMJAk2ZIWXxh+rfUKoF8QSRhAxRacu7q5IgHQt5/S0uOEFefj5vJI1svPhg5RwaC7u6MrlRsLArbYcG4SFv8vMSJRpW9Uqdhu9PvvzFIDoc4Nu3SdOsOsJ0djswgXh7ArLfLBUzqQiLLORmNoK/pqHdvArJavtuPttgGhR7EMCnBWAw4MHmENI++zS6PWn9DCuuEQQPju+IiFHzwO4uN9CHWDnZnZBc64OEZ4CYCIje4+4A2YiQXwn0sqJ0+PG4bf61C3w5LLMy57snGA== X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:SN6PR11MB2718.namprd11.prod.outlook.com; PTR:; CAT:NONE; SFS:(39850400004)(396003)(366004)(136003)(346002)(376002)(66556008)(66476007)(6512007)(26005)(36756003)(66946007)(16526019)(186003)(316002)(4326008)(2616005)(956004)(1076003)(30864003)(5660300002)(107886003)(6486002)(54906003)(86362001)(8676002)(83380400001)(8936002)(66574015)(52116002)(2906002)(6506007)(8886007)(6666004)(478600001); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: silabs.com X-MS-Exchange-CrossTenant-Network-Message-Id: dda3d1fe-a4e4-419d-364e-08d86e9c3afe X-MS-Exchange-CrossTenant-AuthSource: SN6PR11MB2718.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 12 Oct 2020 10:47:35.8316 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 54dbd822-5231-4b20-944d-6f4abcd541fb X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: r64fV7vWR8kLJd0FGS8twSYT7pLixD5lzXCS5ON4UQiciXVagJhU/Gi4W/GyIkG5jFA0YErTbK42uQzxTs+aCA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR11MB4734 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org From: Jérôme Pouiller Signed-off-by: Jérôme Pouiller --- drivers/net/wireless/silabs/wfx/queue.c | 304 ++++++++++++++++++++++++ drivers/net/wireless/silabs/wfx/queue.h | 45 ++++ 2 files changed, 349 insertions(+) create mode 100644 drivers/net/wireless/silabs/wfx/queue.c create mode 100644 drivers/net/wireless/silabs/wfx/queue.h diff --git a/drivers/net/wireless/silabs/wfx/queue.c b/drivers/net/wireless/silabs/wfx/queue.c new file mode 100644 index 000000000000..31c37f69c295 --- /dev/null +++ b/drivers/net/wireless/silabs/wfx/queue.c @@ -0,0 +1,304 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * O(1) TX queue with built-in allocator. + * + * Copyright (c) 2017-2020, Silicon Laboratories, Inc. + * Copyright (c) 2010, ST-Ericsson + */ +#include +#include + +#include "queue.h" +#include "wfx.h" +#include "sta.h" +#include "data_tx.h" +#include "traces.h" + +void wfx_tx_lock(struct wfx_dev *wdev) +{ + atomic_inc(&wdev->tx_lock); +} + +void wfx_tx_unlock(struct wfx_dev *wdev) +{ + int tx_lock = atomic_dec_return(&wdev->tx_lock); + + WARN(tx_lock < 0, "inconsistent tx_lock value"); + if (!tx_lock) + wfx_bh_request_tx(wdev); +} + +void wfx_tx_flush(struct wfx_dev *wdev) +{ + int ret; + + // Do not wait for any reply if chip is frozen + if (wdev->chip_frozen) + return; + + wfx_tx_lock(wdev); + mutex_lock(&wdev->hif_cmd.lock); + ret = wait_event_timeout(wdev->hif.tx_buffers_empty, + !wdev->hif.tx_buffers_used, + msecs_to_jiffies(3000)); + if (!ret) { + dev_warn(wdev->dev, "cannot flush tx buffers (%d still busy)\n", + wdev->hif.tx_buffers_used); + wfx_pending_dump_old_frames(wdev, 3000); + // FIXME: drop pending frames here + wdev->chip_frozen = true; + } + mutex_unlock(&wdev->hif_cmd.lock); + wfx_tx_unlock(wdev); +} + +void wfx_tx_lock_flush(struct wfx_dev *wdev) +{ + wfx_tx_lock(wdev); + wfx_tx_flush(wdev); +} + +void wfx_tx_queues_init(struct wfx_vif *wvif) +{ + // The device is in charge to respect the details of the QoS parameters. + // The driver just ensure that it roughtly respect the priorities to + // avoid any shortage. + const int priorities[IEEE80211_NUM_ACS] = { 1, 2, 64, 128 }; + int i; + + for (i = 0; i < IEEE80211_NUM_ACS; ++i) { + skb_queue_head_init(&wvif->tx_queue[i].normal); + skb_queue_head_init(&wvif->tx_queue[i].cab); + wvif->tx_queue[i].priority = priorities[i]; + } +} + +void wfx_tx_queues_check_empty(struct wfx_vif *wvif) +{ + int i; + + for (i = 0; i < IEEE80211_NUM_ACS; ++i) { + WARN_ON(atomic_read(&wvif->tx_queue[i].pending_frames)); + WARN_ON(!skb_queue_empty_lockless(&wvif->tx_queue[i].normal)); + WARN_ON(!skb_queue_empty_lockless(&wvif->tx_queue[i].cab)); + } +} + +bool wfx_tx_queue_empty(struct wfx_vif *wvif, struct wfx_queue *queue) +{ + return skb_queue_empty(&queue->normal) && skb_queue_empty(&queue->cab); +} + +static void __wfx_tx_queue_drop(struct wfx_vif *wvif, + struct sk_buff_head *skb_queue, + struct sk_buff_head *dropped) +{ + struct sk_buff *skb, *tmp; + + spin_lock_bh(&skb_queue->lock); + skb_queue_walk_safe(skb_queue, skb, tmp) { + __skb_unlink(skb, skb_queue); + skb_queue_head(dropped, skb); + } + spin_unlock_bh(&skb_queue->lock); +} + +void wfx_tx_queue_drop(struct wfx_vif *wvif, struct wfx_queue *queue, + struct sk_buff_head *dropped) +{ + __wfx_tx_queue_drop(wvif, &queue->cab, dropped); + __wfx_tx_queue_drop(wvif, &queue->normal, dropped); + wake_up(&wvif->wdev->tx_dequeue); +} + +void wfx_tx_queues_put(struct wfx_vif *wvif, struct sk_buff *skb) +{ + struct wfx_queue *queue = &wvif->tx_queue[skb_get_queue_mapping(skb)]; + struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb); + + if (tx_info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) + skb_queue_tail(&queue->cab, skb); + else + skb_queue_tail(&queue->normal, skb); +} + +void wfx_pending_drop(struct wfx_dev *wdev, struct sk_buff_head *dropped) +{ + struct wfx_queue *queue; + struct wfx_vif *wvif; + struct hif_msg *hif; + struct sk_buff *skb; + + WARN(!wdev->chip_frozen, "%s should only be used to recover a frozen device", + __func__); + while ((skb = skb_dequeue(&wdev->tx_pending)) != NULL) { + hif = (struct hif_msg *)skb->data; + wvif = wdev_to_wvif(wdev, hif->interface); + if (wvif) { + queue = &wvif->tx_queue[skb_get_queue_mapping(skb)]; + WARN_ON(skb_get_queue_mapping(skb) > 3); + WARN_ON(!atomic_read(&queue->pending_frames)); + atomic_dec(&queue->pending_frames); + } + skb_queue_head(dropped, skb); + } +} + +struct sk_buff *wfx_pending_get(struct wfx_dev *wdev, u32 packet_id) +{ + struct wfx_queue *queue; + struct hif_req_tx *req; + struct wfx_vif *wvif; + struct hif_msg *hif; + struct sk_buff *skb; + + spin_lock_bh(&wdev->tx_pending.lock); + skb_queue_walk(&wdev->tx_pending, skb) { + hif = (struct hif_msg *)skb->data; + req = (struct hif_req_tx *)hif->body; + if (req->packet_id != packet_id) + continue; + spin_unlock_bh(&wdev->tx_pending.lock); + wvif = wdev_to_wvif(wdev, hif->interface); + if (wvif) { + queue = &wvif->tx_queue[skb_get_queue_mapping(skb)]; + WARN_ON(skb_get_queue_mapping(skb) > 3); + WARN_ON(!atomic_read(&queue->pending_frames)); + atomic_dec(&queue->pending_frames); + } + skb_unlink(skb, &wdev->tx_pending); + return skb; + } + spin_unlock_bh(&wdev->tx_pending.lock); + WARN(1, "cannot find packet in pending queue"); + return NULL; +} + +void wfx_pending_dump_old_frames(struct wfx_dev *wdev, unsigned int limit_ms) +{ + ktime_t now = ktime_get(); + struct wfx_tx_priv *tx_priv; + struct hif_req_tx *req; + struct sk_buff *skb; + bool first = true; + + spin_lock_bh(&wdev->tx_pending.lock); + skb_queue_walk(&wdev->tx_pending, skb) { + tx_priv = wfx_skb_tx_priv(skb); + req = wfx_skb_txreq(skb); + if (ktime_after(now, ktime_add_ms(tx_priv->xmit_timestamp, + limit_ms))) { + if (first) { + dev_info(wdev->dev, "frames stuck in firmware since %dms or more:\n", + limit_ms); + first = false; + } + dev_info(wdev->dev, " id %08x sent %lldms ago\n", + req->packet_id, + ktime_ms_delta(now, tx_priv->xmit_timestamp)); + } + } + spin_unlock_bh(&wdev->tx_pending.lock); +} + +unsigned int wfx_pending_get_pkt_us_delay(struct wfx_dev *wdev, + struct sk_buff *skb) +{ + ktime_t now = ktime_get(); + struct wfx_tx_priv *tx_priv = wfx_skb_tx_priv(skb); + + return ktime_us_delta(now, tx_priv->xmit_timestamp); +} + +bool wfx_tx_queues_has_cab(struct wfx_vif *wvif) +{ + int i; + + if (wvif->vif->type != NL80211_IFTYPE_AP) + return false; + for (i = 0; i < IEEE80211_NUM_ACS; ++i) + // Note: since only AP can have mcast frames in queue and only + // one vif can be AP, all queued frames has same interface id + if (!skb_queue_empty_lockless(&wvif->tx_queue[i].cab)) + return true; + return false; +} + +static int wfx_tx_queue_get_weight(struct wfx_queue *queue) +{ + return atomic_read(&queue->pending_frames) * queue->priority; +} + +static struct sk_buff *wfx_tx_queues_get_skb(struct wfx_dev *wdev) +{ + struct wfx_queue *queues[IEEE80211_NUM_ACS * ARRAY_SIZE(wdev->vif)]; + int i, j, num_queues = 0; + struct wfx_vif *wvif; + struct hif_msg *hif; + struct sk_buff *skb; + + // sort the queues + wvif = NULL; + while ((wvif = wvif_iterate(wdev, wvif)) != NULL) { + for (i = 0; i < IEEE80211_NUM_ACS; i++) { + WARN_ON(num_queues >= ARRAY_SIZE(queues)); + queues[num_queues] = &wvif->tx_queue[i]; + for (j = num_queues; j > 0; j--) + if (wfx_tx_queue_get_weight(queues[j]) < + wfx_tx_queue_get_weight(queues[j - 1])) + swap(queues[j - 1], queues[j]); + num_queues++; + } + } + + wvif = NULL; + while ((wvif = wvif_iterate(wdev, wvif)) != NULL) { + if (!wvif->after_dtim_tx_allowed) + continue; + for (i = 0; i < num_queues; i++) { + skb = skb_dequeue(&queues[i]->cab); + if (!skb) + continue; + // Note: since only AP can have mcast frames in queue + // and only one vif can be AP, all queued frames has + // same interface id + hif = (struct hif_msg *)skb->data; + WARN_ON(hif->interface != wvif->id); + WARN_ON(queues[i] != + &wvif->tx_queue[skb_get_queue_mapping(skb)]); + atomic_inc(&queues[i]->pending_frames); + trace_queues_stats(wdev, queues[i]); + return skb; + } + // No more multicast to sent + wvif->after_dtim_tx_allowed = false; + schedule_work(&wvif->update_tim_work); + } + + for (i = 0; i < num_queues; i++) { + skb = skb_dequeue(&queues[i]->normal); + if (skb) { + atomic_inc(&queues[i]->pending_frames); + trace_queues_stats(wdev, queues[i]); + return skb; + } + } + return NULL; +} + +struct hif_msg *wfx_tx_queues_get(struct wfx_dev *wdev) +{ + struct wfx_tx_priv *tx_priv; + struct sk_buff *skb; + + if (atomic_read(&wdev->tx_lock)) + return NULL; + skb = wfx_tx_queues_get_skb(wdev); + if (!skb) + return NULL; + skb_queue_tail(&wdev->tx_pending, skb); + wake_up(&wdev->tx_dequeue); + tx_priv = wfx_skb_tx_priv(skb); + tx_priv->xmit_timestamp = ktime_get(); + return (struct hif_msg *)skb->data; +} diff --git a/drivers/net/wireless/silabs/wfx/queue.h b/drivers/net/wireless/silabs/wfx/queue.h new file mode 100644 index 000000000000..80ba19455ef3 --- /dev/null +++ b/drivers/net/wireless/silabs/wfx/queue.h @@ -0,0 +1,45 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * O(1) TX queue with built-in allocator. + * + * Copyright (c) 2017-2020, Silicon Laboratories, Inc. + * Copyright (c) 2010, ST-Ericsson + */ +#ifndef WFX_QUEUE_H +#define WFX_QUEUE_H + +#include +#include + +struct wfx_dev; +struct wfx_vif; + +struct wfx_queue { + struct sk_buff_head normal; + struct sk_buff_head cab; // Content After (DTIM) Beacon + atomic_t pending_frames; + int priority; +}; + +void wfx_tx_lock(struct wfx_dev *wdev); +void wfx_tx_unlock(struct wfx_dev *wdev); +void wfx_tx_flush(struct wfx_dev *wdev); +void wfx_tx_lock_flush(struct wfx_dev *wdev); + +void wfx_tx_queues_init(struct wfx_vif *wvif); +void wfx_tx_queues_check_empty(struct wfx_vif *wvif); +bool wfx_tx_queues_has_cab(struct wfx_vif *wvif); +void wfx_tx_queues_put(struct wfx_vif *wvif, struct sk_buff *skb); +struct hif_msg *wfx_tx_queues_get(struct wfx_dev *wdev); + +bool wfx_tx_queue_empty(struct wfx_vif *wvif, struct wfx_queue *queue); +void wfx_tx_queue_drop(struct wfx_vif *wvif, struct wfx_queue *queue, + struct sk_buff_head *dropped); + +struct sk_buff *wfx_pending_get(struct wfx_dev *wdev, u32 packet_id); +void wfx_pending_drop(struct wfx_dev *wdev, struct sk_buff_head *dropped); +unsigned int wfx_pending_get_pkt_us_delay(struct wfx_dev *wdev, + struct sk_buff *skb); +void wfx_pending_dump_old_frames(struct wfx_dev *wdev, unsigned int limit_ms); + +#endif /* WFX_QUEUE_H */