From patchwork Sat Nov 21 17:33:25 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Felix Fietkau X-Patchwork-Id: 330228 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5B1ACC388F9 for ; Sat, 21 Nov 2020 17:33:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id AFAE0221FC for ; Sat, 21 Nov 2020 17:33:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=nbd.name header.i=@nbd.name header.b="jo6MtkXW" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727159AbgKURdc (ORCPT ); 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Received: from p5b206c33.dip0.t-ipconnect.de ([91.32.108.51] helo=localhost.localdomain) by ds12 with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_CBC_SHA1:128) (Exim 4.89) (envelope-from ) id 1kgWlM-0004bc-8J for linux-wireless@vger.kernel.org; Sat, 21 Nov 2020 18:33:28 +0100 From: Felix Fietkau To: linux-wireless@vger.kernel.org Subject: [PATCH 2/3] mt76: mt7915: stop queues when running out of tx tokens Date: Sat, 21 Nov 2020 18:33:25 +0100 Message-Id: <20201121173326.88208-2-nbd@nbd.name> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201121173326.88208-1-nbd@nbd.name> References: <20201121173326.88208-1-nbd@nbd.name> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org Avoids packet drops under load with lots of stations Signed-off-by: Felix Fietkau --- .../net/wireless/mediatek/mt76/mt7915/init.c | 1 + .../net/wireless/mediatek/mt76/mt7915/mac.c | 39 +++++++++++++++++++ .../wireless/mediatek/mt76/mt7915/mt7915.h | 2 + 3 files changed, 42 insertions(+) diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/init.c b/drivers/net/wireless/mediatek/mt76/mt7915/init.c index ff29a8090739..ed4635bd151a 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7915/init.c +++ b/drivers/net/wireless/mediatek/mt76/mt7915/init.c @@ -690,6 +690,7 @@ void mt7915_unregister_device(struct mt7915_dev *dev) ieee80211_free_txskb(hw, txwi->skb); } mt76_put_txwi(&dev->mt76, txwi); + dev->token_count--; } spin_unlock_bh(&dev->token_lock); idr_destroy(&dev->token); diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c index a7fa6fffffff..d93d5ba33dbe 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7915/mac.c +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mac.c @@ -918,6 +918,26 @@ void mt7915_mac_write_txwi(struct mt7915_dev *dev, __le32 *txwi, mt7915_mac_write_txwi_tm(dev, mphy, txwi, skb); } +static void +mt7915_set_tx_blocked(struct mt7915_dev *dev, bool blocked) +{ + struct mt76_phy *mphy = &dev->mphy, *mphy2 = dev->mt76.phy2; + struct mt76_queue *q, *q2 = NULL; + + q = mphy->q_tx[0]; + if (blocked == q->blocked) + return; + + q->blocked = blocked; + if (mphy2) { + q2 = mphy->q_tx[0]; + q2->blocked = blocked; + } + + if (!blocked) + mt76_worker_schedule(&dev->mt76.tx_worker); +} + int mt7915_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr, enum mt76_txq_id qid, struct mt76_wcid *wcid, struct ieee80211_sta *sta, @@ -974,7 +994,13 @@ int mt7915_tx_prepare_skb(struct mt76_dev *mdev, void *txwi_ptr, spin_lock_bh(&dev->token_lock); id = idr_alloc(&dev->token, t, 0, MT7915_TOKEN_SIZE, GFP_ATOMIC); + if (id >= 0) + dev->token_count++; + + if (dev->token_count >= MT7915_TOKEN_SIZE - MT7915_TOKEN_FREE_THR) + mt7915_set_tx_blocked(dev, true); spin_unlock_bh(&dev->token_lock); + if (id < 0) return id; @@ -1083,6 +1109,7 @@ void mt7915_mac_tx_free(struct mt7915_dev *dev, struct sk_buff *skb) LIST_HEAD(free_list); struct sk_buff *tmp; u8 i, count; + bool wake = true; /* clean DMA queues and unmap buffers first */ mt76_queue_tx_cleanup(dev, dev->mphy.q_tx[MT_TXQ_PSD], false); @@ -1135,6 +1162,11 @@ void mt7915_mac_tx_free(struct mt7915_dev *dev, struct sk_buff *skb) spin_lock_bh(&dev->token_lock); txwi = idr_remove(&dev->token, msdu); + if (txwi) + dev->token_count--; + if (dev->token_count < MT7915_TOKEN_SIZE - MT7915_TOKEN_FREE_THR && + dev->mphy.q_tx[0]->blocked) + wake = true; spin_unlock_bh(&dev->token_lock); if (!txwi) @@ -1165,6 +1197,13 @@ void mt7915_mac_tx_free(struct mt7915_dev *dev, struct sk_buff *skb) } mt7915_mac_sta_poll(dev); + + if (wake) { + spin_lock_bh(&dev->token_lock); + mt7915_set_tx_blocked(dev, false); + spin_unlock_bh(&dev->token_lock); + } + mt76_worker_schedule(&dev->mt76.tx_worker); napi_consume_skb(skb, 1); diff --git a/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h b/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h index 30e53a0f01fb..0339abf360d3 100644 --- a/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h +++ b/drivers/net/wireless/mediatek/mt76/mt7915/mt7915.h @@ -32,6 +32,7 @@ #define MT7915_EEPROM_SIZE 3584 #define MT7915_TOKEN_SIZE 8192 +#define MT7915_TOKEN_FREE_THR 64 #define MT7915_CFEND_RATE_DEFAULT 0x49 /* OFDM 24M */ #define MT7915_CFEND_RATE_11B 0x03 /* 11B LP, 11M */ @@ -161,6 +162,7 @@ struct mt7915_dev { u32 hw_pattern; spinlock_t token_lock; + int token_count; struct idr token; s8 **rate_power; /* TODO: use mt76_rate_power */