From patchwork Tue Oct 29 20:54:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vadim Fedorenko X-Patchwork-Id: 13855498 X-Patchwork-Delegate: kuba@kernel.org Received: from mx0b-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2602B1DC06B for ; Tue, 29 Oct 2024 20:55:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=67.231.153.30 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730235322; cv=none; b=GRGjx7HIsYa2PL5rp1Vfzh+zjH7oJHpWPI64Nk2Gd6tRamH8Z1UAMoD5cUhz4M1hO1NThea8dM2sqoReRTNLE2skJa5VTXWNnITaIOtdY9d7C0q9mSAiJoNBMU475JfvydLmzjM8gqj2LphlPuWVU402qFIoe5vXKsNS08LCdbA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730235322; c=relaxed/simple; bh=7hbLSMwT5GYPfmo28vSt1HrCLcIu7Id0Wqh+BjQV810=; h=From:To:CC:Subject:Date:Message-ID:MIME-Version:Content-Type; b=AdlvzdRAPTlwBYNac0R2TPQFvPTOJgplW54T1WSgUKQEh1aFyk63Z3upfVf55Hu9vvsytkreBWYWBk6UblcAdR8PsA2l2HLxFxc93GKxyujp5LRdM9T2DxUC0SHgCr1wdu1bdCWKQuoDq7Y7jRQb4Nw6IwT65I8nC9AZwHK3Wsc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=meta.com; spf=pass smtp.mailfrom=meta.com; dkim=pass (2048-bit key) header.d=meta.com header.i=@meta.com header.b=NDTXWLzt; arc=none smtp.client-ip=67.231.153.30 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=meta.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=meta.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=meta.com header.i=@meta.com header.b="NDTXWLzt" Received: from pps.filterd (m0109332.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 49TIfFsj022703; Tue, 29 Oct 2024 13:55:01 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=meta.com; h=cc :content-transfer-encoding:content-type:date:from:message-id :mime-version:subject:to; s=s2048-2021-q4; bh=W8lqgIWDleDMEZ/T6/ sfDi03QonPQ4gvbCLT4XJ4N2Q=; b=NDTXWLzt99HIDnJlqJ4JDg74vapTdIYT3y wSqV5QrIB8dFdgqEOdMOWC3lgG2xLknDEEKQUb9wC0izi5uYhqQFPo9FI+wIrNSU atOuB9FsTqy0ZYMEBqoLV2Hy0YFkhVvwEEVjVpKGlqeLWaR4A97QGz+HKm4lraLx 3B6zCon+0yfd/8vt2+wgMoSW52p3SBasIZ6qO9MueXONphLCKGZZwgS+Fz3kk7jF Fxq5GHk8oj3YdqxEoRrsgyB225tuiYmKsLvH8lRmt25DgUfw+SwoyseKKHjeIOcw LNhT//XSe6KyMUuBK2VHumWo3nFwoOJv+mO2OTMwwzde1/Vrud2Q== Received: from maileast.thefacebook.com ([163.114.135.16]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 42jx3pmmsj-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Tue, 29 Oct 2024 13:55:00 -0700 (PDT) Received: from devvm4158.cln0.facebook.com (2620:10d:c0a8:1b::30) by mail.thefacebook.com (2620:10d:c0a9:6f::8fd4) with Microsoft SMTP Server id 15.2.1544.11; Tue, 29 Oct 2024 20:54:59 +0000 From: Vadim Fedorenko To: Vadim Fedorenko , Michael Chan , Pavan Chebbi , "Jakub Kicinski" CC: Andrew Lunn , Paolo Abeni , "David S. Miller" , , "Richard Cochran" , Vadim Fedorenko Subject: [PATCH net-next v4 1/2] bnxt_en: cache only 24 bits of hw counter Date: Tue, 29 Oct 2024 13:54:52 -0700 Message-ID: <20241029205453.2290688-1-vadfed@meta.com> X-Mailer: git-send-email 2.43.5 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-GUID: sQnqKTSjK_Dzp3LpcZwugmVshMTAsL97 X-Proofpoint-ORIG-GUID: sQnqKTSjK_Dzp3LpcZwugmVshMTAsL97 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-05_03,2024-10-04_01,2024-09-30_01 X-Patchwork-Delegate: kuba@kernel.org This hardware can provide only 48 bits of cycle counter. We can leave only 24 bits in the cache to extend RX timestamps from 32 bits to 48 bits. Lower 8 bits of the cached value will be used to check for roll-over while extending to full 48 bits. This change makes cache writes atomic even on 32 bit platforms and we can simply use READ_ONCE()/WRITE_ONCE() pair and remove spinlock. The configuration structure will be also reduced by 4 bytes. Signed-off-by: Vadim Fedorenko --- drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c | 8 ++++---- drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h | 18 +++--------------- 2 files changed, 7 insertions(+), 19 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c index fa514be87650..820c7e83e586 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c @@ -106,7 +106,7 @@ static void bnxt_ptp_get_current_time(struct bnxt *bp) if (!ptp) return; spin_lock_irqsave(&ptp->ptp_lock, flags); - WRITE_ONCE(ptp->old_time, ptp->current_time); + WRITE_ONCE(ptp->old_time, (u32)(ptp->current_time >> BNXT_HI_TIMER_SHIFT)); bnxt_refclk_read(bp, NULL, &ptp->current_time); spin_unlock_irqrestore(&ptp->ptp_lock, flags); } @@ -174,7 +174,7 @@ void bnxt_ptp_update_current_time(struct bnxt *bp) struct bnxt_ptp_cfg *ptp = bp->ptp_cfg; bnxt_refclk_read(ptp->bp, NULL, &ptp->current_time); - WRITE_ONCE(ptp->old_time, ptp->current_time); + WRITE_ONCE(ptp->old_time, (u32)(ptp->current_time >> BNXT_HI_TIMER_SHIFT)); } static int bnxt_ptp_adjphc(struct bnxt_ptp_cfg *ptp, s64 delta) @@ -813,7 +813,7 @@ int bnxt_get_rx_ts_p5(struct bnxt *bp, u64 *ts, u32 pkt_ts) if (!ptp) return -ENODEV; - BNXT_READ_TIME64(ptp, time, ptp->old_time); + time = (u64)(READ_ONCE(ptp->old_time) << BNXT_HI_TIMER_SHIFT); *ts = (time & BNXT_HI_TIMER_MASK) | pkt_ts; if (pkt_ts < (time & BNXT_LO_TIMER_MASK)) *ts += BNXT_LO_TIMER_MASK + 1; @@ -1079,7 +1079,7 @@ int bnxt_ptp_init(struct bnxt *bp, bool phc_cfg) spin_lock_irqsave(&ptp->ptp_lock, flags); bnxt_refclk_read(bp, NULL, &ptp->current_time); - WRITE_ONCE(ptp->old_time, ptp->current_time); + WRITE_ONCE(ptp->old_time, (u32)(ptp->current_time >> BNXT_HI_TIMER_SHIFT)); spin_unlock_irqrestore(&ptp->ptp_lock, flags); ptp_schedule_worker(ptp->ptp_clock, 0); } diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h index f322466ecad3..3ac5cbc1c5c4 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h @@ -21,6 +21,7 @@ #define BNXT_DEVCLK_FREQ 1000000 #define BNXT_LO_TIMER_MASK 0x0000ffffffffUL #define BNXT_HI_TIMER_MASK 0xffff00000000UL +#define BNXT_HI_TIMER_SHIFT 24 #define BNXT_PTP_DFLT_TX_TMO 1000 /* ms */ #define BNXT_PTP_QTS_TIMEOUT 1000 @@ -106,10 +107,11 @@ struct bnxt_ptp_cfg { /* serialize ts tx request queuing */ spinlock_t ptp_tx_lock; u64 current_time; - u64 old_time; unsigned long next_period; unsigned long next_overflow_check; u32 cmult; + /* cache of upper 24 bits of cyclecoutner. 8 bits are used to check for roll-over */ + u32 old_time; /* a 23b shift cyclecounter will overflow in ~36 mins. Check overflow every 18 mins. */ #define BNXT_PHC_OVERFLOW_PERIOD (18 * 60 * HZ) @@ -145,20 +147,6 @@ struct bnxt_ptp_cfg { struct bnxt_ptp_stats stats; }; -#if BITS_PER_LONG == 32 -#define BNXT_READ_TIME64(ptp, dst, src) \ -do { \ - unsigned long flags; \ - \ - spin_lock_irqsave(&(ptp)->ptp_lock, flags); \ - (dst) = (src); \ - spin_unlock_irqrestore(&(ptp)->ptp_lock, flags); \ -} while (0) -#else -#define BNXT_READ_TIME64(ptp, dst, src) \ - ((dst) = READ_ONCE(src)) -#endif - #define BNXT_PTP_INC_TX_AVAIL(ptp) \ do { \ spin_lock_bh(&(ptp)->ptp_tx_lock); \ From patchwork Tue Oct 29 20:54:53 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vadim Fedorenko X-Patchwork-Id: 13855499 X-Patchwork-Delegate: kuba@kernel.org Received: from mx0b-00082601.pphosted.com (mx0b-00082601.pphosted.com [67.231.153.30]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 25FC5192D9E for ; Tue, 29 Oct 2024 20:55:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=67.231.153.30 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730235323; cv=none; b=YOH1O5SYyOfiCiE0EbEbPZKCTQe81u8PlAyU4fENBxLIa978Fa3BO1zor5Mk0YaSRxtTdw8TUtC+wAeNrhro7Q4qLsG3XFkn1uqBaM4xY7bRoDh+8z6RwA8n4EU3AGDSbSSf2QSoyQ2UXWqWRvDX8ONJNzMpBtzUGKqOwb/VW+k= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730235323; c=relaxed/simple; bh=imFbBWq1HbHuu6kNYBOk1Vmmt29toUvYsCwWQ0IOs3o=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=e4y7+U+8UvDzcIpEgL1mxeWS/9KaajPnNE62p91SPed7IdsuUNChQjNdPhxFvK5n2WJuLZvLTRlPZOVI/Vh2rVLVgc99hgJFCR0pAUHZ+K3DspkyB1sXn1EpfObNq7YTAcw8CR/3gqUdtZYrLSWaUi5U5247FNmtX5hMZhbDdts= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=meta.com; spf=pass smtp.mailfrom=meta.com; dkim=pass (2048-bit key) header.d=meta.com header.i=@meta.com header.b=JRvDRjGX; arc=none smtp.client-ip=67.231.153.30 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=meta.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=meta.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=meta.com header.i=@meta.com header.b="JRvDRjGX" Received: from pps.filterd (m0109331.ppops.net [127.0.0.1]) by mx0a-00082601.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 49TIfOib015985; Tue, 29 Oct 2024 13:55:02 -0700 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=meta.com; h=cc :content-transfer-encoding:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to; s=s2048-2021-q4; bh=txlkE3jOL/ZXDLAZ17hHf1P4kX4MYH+r4fz+EinSujI=; b=JRvDRjGXo3VT kxw1OqGus0TfwriXXpu44kgKUijkMRwgupzE+SqSVQZUi0vukfcmWdZNJO/we/GZ Y2zqK9vNw05Q0k8m6mmnF7lgxMurLWxlXqwJuUdXLkXxMPv0Qz/gOK+O8T9w/2kW V7nqlx7LhweIG3BoPkrNfrIsdZQ9q5j3M5L2EQGhVpSiq11Ee8S6z/EkOAu9ZozU 6l2T6vUTbuJUcajhBc3OkjoCzWH2+wqyL+If3O5nP9ClHFDoGpW21nZl/QUFHmr3 do+KuYeHJCJMndxiB4RfUYVqYgNfLj8JRJ+TsNUV4s61/jC7E3RJjztR5FOcvLfS 3M0B4SEr7A== Received: from maileast.thefacebook.com ([163.114.135.16]) by mx0a-00082601.pphosted.com (PPS) with ESMTPS id 42k1m9u5b4-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128 verify=NOT); Tue, 29 Oct 2024 13:55:02 -0700 (PDT) Received: from devvm4158.cln0.facebook.com (2620:10d:c0a8:1b::30) by mail.thefacebook.com (2620:10d:c0a9:6f::8fd4) with Microsoft SMTP Server id 15.2.1544.11; Tue, 29 Oct 2024 20:55:00 +0000 From: Vadim Fedorenko To: Vadim Fedorenko , Michael Chan , Pavan Chebbi , "Jakub Kicinski" CC: Andrew Lunn , Paolo Abeni , "David S. Miller" , , "Richard Cochran" , Vadim Fedorenko Subject: [PATCH net-next v4 2/2] bnxt_en: replace PTP spinlock with seqlock Date: Tue, 29 Oct 2024 13:54:53 -0700 Message-ID: <20241029205453.2290688-2-vadfed@meta.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20241029205453.2290688-1-vadfed@meta.com> References: <20241029205453.2290688-1-vadfed@meta.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-GUID: -PDvkACepHUMPm564WIDsvXwegbFlP18 X-Proofpoint-ORIG-GUID: -PDvkACepHUMPm564WIDsvXwegbFlP18 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-05_03,2024-10-04_01,2024-09-30_01 X-Patchwork-Delegate: kuba@kernel.org We can see high contention on ptp_lock while doing RX timestamping on high packet rates over several queues. Spinlock is not effecient to protect timecounter for RX timestamps when reads are the most usual operations and writes are only occasional. It's better to use seqlock in such cases. Signed-off-by: Vadim Fedorenko --- v4: - add sequnlock on error path in bnxt_refclk_read() v3: - remove unused variable v2: - use read_excl lock to serialize reg access with FW reset --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 19 +++-- drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c | 77 +++++++------------ drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h | 14 +++- 3 files changed, 49 insertions(+), 61 deletions(-) diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c index 6dd6541d8619..a7eabef6e7ea 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c @@ -2254,11 +2254,8 @@ static int bnxt_rx_pkt(struct bnxt *bp, struct bnxt_cp_ring_info *cpr, if (!bnxt_get_rx_ts_p5(bp, &ts, cmpl_ts)) { struct bnxt_ptp_cfg *ptp = bp->ptp_cfg; - unsigned long flags; - spin_lock_irqsave(&ptp->ptp_lock, flags); - ns = timecounter_cyc2time(&ptp->tc, ts); - spin_unlock_irqrestore(&ptp->ptp_lock, flags); + ns = bnxt_timecounter_cyc2time(ptp, ts); memset(skb_hwtstamps(skb), 0, sizeof(*skb_hwtstamps(skb))); skb_hwtstamps(skb)->hwtstamp = ns_to_ktime(ns); @@ -2764,12 +2761,12 @@ static int bnxt_async_event_process(struct bnxt *bp, if (!ptp) goto async_event_process_exit; - spin_lock_irqsave(&ptp->ptp_lock, flags); bnxt_ptp_update_current_time(bp); ns = (((u64)BNXT_EVENT_PHC_RTC_UPDATE(data1) << BNXT_PHC_BITS) | ptp->current_time); + write_seqlock_irqsave(&ptp->ptp_lock, flags); bnxt_ptp_rtc_timecounter_init(ptp, ns); - spin_unlock_irqrestore(&ptp->ptp_lock, flags); + write_sequnlock_irqrestore(&ptp->ptp_lock, flags); } break; } @@ -13496,12 +13493,13 @@ static void bnxt_force_fw_reset(struct bnxt *bp) test_bit(BNXT_STATE_IN_FW_RESET, &bp->state)) return; + /* we have to serialize with bnxt_refclk_read()*/ if (ptp) { unsigned long flags; - spin_lock_irqsave(&ptp->ptp_lock, flags); + write_seqlock_irqsave(&ptp->ptp_lock, flags); set_bit(BNXT_STATE_IN_FW_RESET, &bp->state); - spin_unlock_irqrestore(&ptp->ptp_lock, flags); + write_sequnlock_irqrestore(&ptp->ptp_lock, flags); } else { set_bit(BNXT_STATE_IN_FW_RESET, &bp->state); } @@ -13565,12 +13563,13 @@ void bnxt_fw_reset(struct bnxt *bp) struct bnxt_ptp_cfg *ptp = bp->ptp_cfg; int n = 0, tmo; + /* we have to serialize with bnxt_refclk_read()*/ if (ptp) { unsigned long flags; - spin_lock_irqsave(&ptp->ptp_lock, flags); + write_seqlock_irqsave(&ptp->ptp_lock, flags); set_bit(BNXT_STATE_IN_FW_RESET, &bp->state); - spin_unlock_irqrestore(&ptp->ptp_lock, flags); + write_sequnlock_irqrestore(&ptp->ptp_lock, flags); } else { set_bit(BNXT_STATE_IN_FW_RESET, &bp->state); } diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c index 820c7e83e586..fa9adc4007d8 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c @@ -67,21 +67,25 @@ static int bnxt_ptp_settime(struct ptp_clock_info *ptp_info, if (BNXT_PTP_USE_RTC(ptp->bp)) return bnxt_ptp_cfg_settime(ptp->bp, ns); - spin_lock_irqsave(&ptp->ptp_lock, flags); + write_seqlock_irqsave(&ptp->ptp_lock, flags); timecounter_init(&ptp->tc, &ptp->cc, ns); - spin_unlock_irqrestore(&ptp->ptp_lock, flags); + write_sequnlock_irqrestore(&ptp->ptp_lock, flags); return 0; } -/* Caller holds ptp_lock */ static int bnxt_refclk_read(struct bnxt *bp, struct ptp_system_timestamp *sts, u64 *ns) { struct bnxt_ptp_cfg *ptp = bp->ptp_cfg; u32 high_before, high_now, low; + unsigned long flags; - if (test_bit(BNXT_STATE_IN_FW_RESET, &bp->state)) + /* We have to serialize reg access and FW reset */ + read_seqlock_excl_irqsave(&ptp->ptp_lock, flags); + if (test_bit(BNXT_STATE_IN_FW_RESET, &bp->state)) { + read_sequnlock_excl_irqrestore(&ptp->ptp_lock, flags); return -EIO; + } high_before = readl(bp->bar0 + ptp->refclk_mapped_regs[1]); ptp_read_system_prets(sts); @@ -93,6 +97,7 @@ static int bnxt_refclk_read(struct bnxt *bp, struct ptp_system_timestamp *sts, low = readl(bp->bar0 + ptp->refclk_mapped_regs[0]); ptp_read_system_postts(sts); } + read_sequnlock_excl_irqrestore(&ptp->ptp_lock, flags); *ns = ((u64)high_now << 32) | low; return 0; @@ -101,14 +106,11 @@ static int bnxt_refclk_read(struct bnxt *bp, struct ptp_system_timestamp *sts, static void bnxt_ptp_get_current_time(struct bnxt *bp) { struct bnxt_ptp_cfg *ptp = bp->ptp_cfg; - unsigned long flags; if (!ptp) return; - spin_lock_irqsave(&ptp->ptp_lock, flags); WRITE_ONCE(ptp->old_time, (u32)(ptp->current_time >> BNXT_HI_TIMER_SHIFT)); bnxt_refclk_read(bp, NULL, &ptp->current_time); - spin_unlock_irqrestore(&ptp->ptp_lock, flags); } static int bnxt_hwrm_port_ts_query(struct bnxt *bp, u32 flags, u64 *ts, @@ -151,24 +153,19 @@ static int bnxt_ptp_gettimex(struct ptp_clock_info *ptp_info, { struct bnxt_ptp_cfg *ptp = container_of(ptp_info, struct bnxt_ptp_cfg, ptp_info); - unsigned long flags; u64 ns, cycles; int rc; - spin_lock_irqsave(&ptp->ptp_lock, flags); rc = bnxt_refclk_read(ptp->bp, sts, &cycles); - if (rc) { - spin_unlock_irqrestore(&ptp->ptp_lock, flags); + if (rc) return rc; - } - ns = timecounter_cyc2time(&ptp->tc, cycles); - spin_unlock_irqrestore(&ptp->ptp_lock, flags); + + ns = bnxt_timecounter_cyc2time(ptp, cycles); *ts = ns_to_timespec64(ns); return 0; } -/* Caller holds ptp_lock */ void bnxt_ptp_update_current_time(struct bnxt *bp) { struct bnxt_ptp_cfg *ptp = bp->ptp_cfg; @@ -180,7 +177,6 @@ void bnxt_ptp_update_current_time(struct bnxt *bp) static int bnxt_ptp_adjphc(struct bnxt_ptp_cfg *ptp, s64 delta) { struct hwrm_port_mac_cfg_input *req; - unsigned long flags; int rc; rc = hwrm_req_init(ptp->bp, req, HWRM_PORT_MAC_CFG); @@ -194,9 +190,7 @@ static int bnxt_ptp_adjphc(struct bnxt_ptp_cfg *ptp, s64 delta) if (rc) { netdev_err(ptp->bp->dev, "ptp adjphc failed. rc = %x\n", rc); } else { - spin_lock_irqsave(&ptp->ptp_lock, flags); bnxt_ptp_update_current_time(ptp->bp); - spin_unlock_irqrestore(&ptp->ptp_lock, flags); } return rc; @@ -211,9 +205,9 @@ static int bnxt_ptp_adjtime(struct ptp_clock_info *ptp_info, s64 delta) if (BNXT_PTP_USE_RTC(ptp->bp)) return bnxt_ptp_adjphc(ptp, delta); - spin_lock_irqsave(&ptp->ptp_lock, flags); + write_seqlock_irqsave(&ptp->ptp_lock, flags); timecounter_adjtime(&ptp->tc, delta); - spin_unlock_irqrestore(&ptp->ptp_lock, flags); + write_sequnlock_irqrestore(&ptp->ptp_lock, flags); return 0; } @@ -246,10 +240,10 @@ static int bnxt_ptp_adjfine(struct ptp_clock_info *ptp_info, long scaled_ppm) if (!BNXT_MH(bp)) return bnxt_ptp_adjfine_rtc(bp, scaled_ppm); - spin_lock_irqsave(&ptp->ptp_lock, flags); + write_seqlock_irqsave(&ptp->ptp_lock, flags); timecounter_read(&ptp->tc); ptp->cc.mult = adjust_by_scaled_ppm(ptp->cmult, scaled_ppm); - spin_unlock_irqrestore(&ptp->ptp_lock, flags); + write_sequnlock_irqrestore(&ptp->ptp_lock, flags); return 0; } @@ -257,13 +251,10 @@ void bnxt_ptp_pps_event(struct bnxt *bp, u32 data1, u32 data2) { struct bnxt_ptp_cfg *ptp = bp->ptp_cfg; struct ptp_clock_event event; - unsigned long flags; u64 ns, pps_ts; pps_ts = EVENT_PPS_TS(data2, data1); - spin_lock_irqsave(&ptp->ptp_lock, flags); - ns = timecounter_cyc2time(&ptp->tc, pps_ts); - spin_unlock_irqrestore(&ptp->ptp_lock, flags); + ns = bnxt_timecounter_cyc2time(ptp, pps_ts); switch (EVENT_DATA2_PPS_EVENT_TYPE(data2)) { case ASYNC_EVENT_CMPL_PPS_TIMESTAMP_EVENT_DATA2_EVENT_TYPE_INTERNAL: @@ -400,17 +391,13 @@ static int bnxt_get_target_cycles(struct bnxt_ptp_cfg *ptp, u64 target_ns, { u64 cycles_now; u64 nsec_now, nsec_delta; - unsigned long flags; int rc; - spin_lock_irqsave(&ptp->ptp_lock, flags); rc = bnxt_refclk_read(ptp->bp, NULL, &cycles_now); - if (rc) { - spin_unlock_irqrestore(&ptp->ptp_lock, flags); + if (rc) return rc; - } - nsec_now = timecounter_cyc2time(&ptp->tc, cycles_now); - spin_unlock_irqrestore(&ptp->ptp_lock, flags); + + nsec_now = bnxt_timecounter_cyc2time(ptp, cycles_now); nsec_delta = target_ns - nsec_now; *cycles_delta = div64_u64(nsec_delta << ptp->cc.shift, ptp->cc.mult); @@ -697,7 +684,6 @@ static int bnxt_stamp_tx_skb(struct bnxt *bp, int slot) struct skb_shared_hwtstamps timestamp; struct bnxt_ptp_tx_req *txts_req; unsigned long now = jiffies; - unsigned long flags; u64 ts = 0, ns = 0; u32 tmo = 0; int rc; @@ -711,9 +697,7 @@ static int bnxt_stamp_tx_skb(struct bnxt *bp, int slot) tmo, slot); if (!rc) { memset(×tamp, 0, sizeof(timestamp)); - spin_lock_irqsave(&ptp->ptp_lock, flags); - ns = timecounter_cyc2time(&ptp->tc, ts); - spin_unlock_irqrestore(&ptp->ptp_lock, flags); + ns = bnxt_timecounter_cyc2time(ptp, ts); timestamp.hwtstamp = ns_to_ktime(ns); skb_tstamp_tx(txts_req->tx_skb, ×tamp); ptp->stats.ts_pkts++; @@ -767,9 +751,9 @@ static long bnxt_ptp_ts_aux_work(struct ptp_clock_info *ptp_info) bnxt_ptp_get_current_time(bp); ptp->next_period = now + HZ; if (time_after_eq(now, ptp->next_overflow_check)) { - spin_lock_irqsave(&ptp->ptp_lock, flags); + write_seqlock_irqsave(&ptp->ptp_lock, flags); timecounter_read(&ptp->tc); - spin_unlock_irqrestore(&ptp->ptp_lock, flags); + write_sequnlock_irqrestore(&ptp->ptp_lock, flags); ptp->next_overflow_check = now + BNXT_PHC_OVERFLOW_PERIOD; } if (rc == -EAGAIN) @@ -829,7 +813,6 @@ void bnxt_tx_ts_cmp(struct bnxt *bp, struct bnxt_napi *bnapi, u32 opaque = tscmp->tx_ts_cmp_opaque; struct bnxt_tx_ring_info *txr; struct bnxt_sw_tx_bd *tx_buf; - unsigned long flags; u64 ts, ns; u16 cons; @@ -844,9 +827,7 @@ void bnxt_tx_ts_cmp(struct bnxt *bp, struct bnxt_napi *bnapi, le32_to_cpu(tscmp->tx_ts_cmp_flags_type), le32_to_cpu(tscmp->tx_ts_cmp_errors_v)); } else { - spin_lock_irqsave(&ptp->ptp_lock, flags); - ns = timecounter_cyc2time(&ptp->tc, ts); - spin_unlock_irqrestore(&ptp->ptp_lock, flags); + ns = bnxt_timecounter_cyc2time(ptp, ts); timestamp.hwtstamp = ns_to_ktime(ns); skb_tstamp_tx(tx_buf->skb, ×tamp); } @@ -1005,9 +986,9 @@ int bnxt_ptp_init_rtc(struct bnxt *bp, bool phc_cfg) if (rc) return rc; } - spin_lock_irqsave(&bp->ptp_cfg->ptp_lock, flags); + write_seqlock_irqsave(&bp->ptp_cfg->ptp_lock, flags); bnxt_ptp_rtc_timecounter_init(bp->ptp_cfg, ns); - spin_unlock_irqrestore(&bp->ptp_cfg->ptp_lock, flags); + write_sequnlock_irqrestore(&bp->ptp_cfg->ptp_lock, flags); return 0; } @@ -1042,7 +1023,7 @@ int bnxt_ptp_init(struct bnxt *bp, bool phc_cfg) bnxt_ptp_free(bp); WRITE_ONCE(ptp->tx_avail, BNXT_MAX_TX_TS); - spin_lock_init(&ptp->ptp_lock); + seqlock_init(&ptp->ptp_lock); spin_lock_init(&ptp->ptp_tx_lock); if (BNXT_PTP_USE_RTC(bp)) { @@ -1075,12 +1056,8 @@ int bnxt_ptp_init(struct bnxt *bp, bool phc_cfg) atomic64_set(&ptp->stats.ts_err, 0); if (bp->flags & BNXT_FLAG_CHIP_P5_PLUS) { - unsigned long flags; - - spin_lock_irqsave(&ptp->ptp_lock, flags); bnxt_refclk_read(bp, NULL, &ptp->current_time); WRITE_ONCE(ptp->old_time, (u32)(ptp->current_time >> BNXT_HI_TIMER_SHIFT)); - spin_unlock_irqrestore(&ptp->ptp_lock, flags); ptp_schedule_worker(ptp->ptp_clock, 0); } ptp->txts_tmo = BNXT_PTP_DFLT_TX_TMO; diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h index 3ac5cbc1c5c4..4df4c2f373e0 100644 --- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.h @@ -103,7 +103,7 @@ struct bnxt_ptp_cfg { struct timecounter tc; struct bnxt_pps pps_info; /* serialize timecounter access */ - spinlock_t ptp_lock; + seqlock_t ptp_lock; /* serialize ts tx request queuing */ spinlock_t ptp_tx_lock; u64 current_time; @@ -170,4 +170,16 @@ void bnxt_ptp_rtc_timecounter_init(struct bnxt_ptp_cfg *ptp, u64 ns); int bnxt_ptp_init_rtc(struct bnxt *bp, bool phc_cfg); int bnxt_ptp_init(struct bnxt *bp, bool phc_cfg); void bnxt_ptp_clear(struct bnxt *bp); +static inline u64 bnxt_timecounter_cyc2time(struct bnxt_ptp_cfg *ptp, u64 ts) +{ + unsigned int seq; + u64 ns; + + do { + seq = read_seqbegin(&ptp->ptp_lock); + ns = timecounter_cyc2time(&ptp->tc, ts); + } while (read_seqretry(&ptp->ptp_lock, seq)); + + return ns; +} #endif