From nobody Fri Dec 19 20:16:36 2025 Received: from mail-pf1-f201.google.com (mail-pf1-f201.google.com [209.85.210.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0E9872D3224 for ; Thu, 22 May 2025 23:57:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747958270; cv=none; b=aYcH5vwIFbRQg/Z5+iqLskdGzjQGUA4BoAwy8TDC3eV7t6rNELQzvXMBxD+Nx+mBNS8HNJ+DsW042NKB9ZK1tP/aVt5NOb+1M1JGH6XwctzIq2ygaCwYj7gI8wFzh+qWEmxCdrauGjjW3EOHvWiyyvV7GqO65hs88HRXckxaC14= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747958270; c=relaxed/simple; bh=a4VqRaia5JYPq57558dzEWArK2e1J4BTgLt/mTkBsWI=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=fyJYGQlm5HBAtfMGQ7h+rQUxaxs96xMec5sbYJzE67goBDJ3HLidQ6Ixj1kN5BvNMgYzv9D5Nicx58M/hIGbveX6MFAAe4j+CuQLTrXHu1sdvhRXsm6zQDrHDMUIwMvoRHsDFyWyApHfe9111gzZ+JKvz7KX4wVFXTpwDQyXyGU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--hramamurthy.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=EDAi81be; arc=none smtp.client-ip=209.85.210.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--hramamurthy.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="EDAi81be" Received: by mail-pf1-f201.google.com with SMTP id d2e1a72fcca58-742cc20e11eso3880152b3a.1 for ; Thu, 22 May 2025 16:57:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1747958268; x=1748563068; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=g1Dqa/h1soTp69c+jO+vPQcLca0UczAuPPAO2k24wLg=; b=EDAi81bec8ZtIBujFinZJVo1GfHyIEaEYGGj1fvTCQt99WoeE2DsXrnNZCqpCsOe1j dZDdUzC+ntfV2X+i1vXFN+tE44jmu5TB5coT1LoEyO7TNAkQLy5JaxIPiYdvsxgazGxc vcc0tE99EiR5gnzMXcTvM8JewjDnYU/vQOfv+cLeJKH/IPx8N4usb65ATNwdzJTCfVo3 vPOGM9cawjxXq2cEE0sawwU3DHdUIytdOCWtYKJsOJ7ogiloHfvUdG5xRRKGxZG4LU5X NEaFlTvLXF6oYE6JM5GR3TP5nRS/r+ouYEaU64SKe82HzX7JkP303Ps/iZQe9oAjJL6N +I7g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1747958268; x=1748563068; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=g1Dqa/h1soTp69c+jO+vPQcLca0UczAuPPAO2k24wLg=; b=dysJ4vFl5jzxZYTGAORxYGWPZKYX3XX54/M+A/K1wA5Xxlq7OkGlARQwe5B5OxUksD XNMquMdHVu/oa7mrk+rg5WXvX8RTumRP+I9kJTH58sevNleFBt3ijGKsgEG7Xfw92Yp5 g8ewtLtFWX5MRfOqFywfc3/hz42ZKBXt29ZTXnpDBL61+8scb/6HihEgWdifeiqLC9St NI/ucShsGQEFFln5a6dk/Q8T4KFf80R9qcAvy0SuYPYJw4Ls4D2GCAqaYBQidKPNTzNK KplEmAiNkVRf1L9KP212ACXqRjStetZU/rI7YtkWjWWgzSHMAsU56h8byM7G6kouN66g xK+Q== X-Forwarded-Encrypted: i=1; AJvYcCUJ2BI4Oh4pTvh6KLXZBq2R+IC142bXF7ZxdN8bkSHuTj/Bfn1KlvwUckQLYihtNSwuTAkPghVFwxg0VWg=@vger.kernel.org X-Gm-Message-State: AOJu0YxIKu1YSjAj/Wlqu9ic19feQlGQsZplgJN0p6FuYM7X9ISGso+k 9lVYv6sPK6j3h7ElbyILQ7osE4DYJHyqtSzddzAuURVHDqXe75qD6ehC3QDWwExSuphQKFe4Kw4 +IWEd9zqGZ/ah8p8wyi7rtFN7Sw== X-Google-Smtp-Source: AGHT+IGwki/Y2IVocXy02XX5qbT7c1tp+xm8ILZ1XfHcJTMpQOOCeGljPIhF4SWHZ0aaQj47N8jhPgFw1Gdv3/UOcA== X-Received: from pfhm3.prod.google.com ([2002:a62:f203:0:b0:736:3e92:66d7]) (user=hramamurthy job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:3a27:b0:736:6ecd:8e34 with SMTP id d2e1a72fcca58-742acd5071emr36759912b3a.18.1747958268187; Thu, 22 May 2025 16:57:48 -0700 (PDT) Date: Thu, 22 May 2025 23:57:34 +0000 In-Reply-To: <20250522235737.1925605-1-hramamurthy@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250522235737.1925605-1-hramamurthy@google.com> X-Mailer: git-send-email 2.49.0.1151.ga128411c76-goog Message-ID: <20250522235737.1925605-6-hramamurthy@google.com> Subject: [PATCH net-next v3 5/8] gve: Add support to query the nic clock From: Harshitha Ramamurthy To: netdev@vger.kernel.org Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, jeroendb@google.com, hramamurthy@google.com, andrew+netdev@lunn.ch, willemb@google.com, ziweixiao@google.com, pkaligineedi@google.com, yyd@google.com, joshwash@google.com, shailend@google.com, linux@treblig.org, thostet@google.com, jfraker@google.com, richardcochran@gmail.com, jdamato@fastly.com, vadim.fedorenko@linux.dev, horms@kernel.org, linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Kevin Yang Query the nic clock and store the results. The timestamp delivered in descriptors has a wraparound time of ~4 seconds so 250ms is chosen as the sync cadence to provide a balance between performance, and drift potential when we do start associating host time and nic time. Leverage PTP's aux_work to query the nic clock periodically. Signed-off-by: Kevin Yang Signed-off-by: John Fraker Signed-off-by: Tim Hostetler Signed-off-by: Ziwei Xiao Reviewed-by: Willem de Bruijn Signed-off-by: Harshitha Ramamurthy Reviewed-by: Vadim Fedorenko --- Changes in v2: - Utilize the ptp's aux_work instead of delayed_work (Jakub Kicinski, Vadim Fedorenko) --- drivers/net/ethernet/google/gve/gve.h | 15 +++++ drivers/net/ethernet/google/gve/gve_ptp.c | 77 ++++++++++++++++++++++- 2 files changed, 90 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/google/gve/gve.h b/drivers/net/ethernet/g= oogle/gve/gve.h index 8d2aa654fd4c..97054b272e40 100644 --- a/drivers/net/ethernet/google/gve/gve.h +++ b/drivers/net/ethernet/google/gve/gve.h @@ -882,6 +882,9 @@ struct gve_priv { /* True if the device supports reading the nic clock */ bool nic_timestamp_supported; struct gve_ptp *ptp; + struct gve_nic_ts_report *nic_ts_report; + dma_addr_t nic_ts_report_bus; + u64 last_sync_nic_counter; /* Clock counter from last NIC TS report */ }; =20 enum gve_service_task_flags_bit { @@ -1261,6 +1264,18 @@ int gve_del_flow_rule(struct gve_priv *priv, struct = ethtool_rxnfc *cmd); int gve_flow_rules_reset(struct gve_priv *priv); /* RSS config */ int gve_init_rss_config(struct gve_priv *priv, u16 num_queues); +/* PTP and timestamping */ +#if IS_ENABLED(CONFIG_PTP_1588_CLOCK) +int gve_init_clock(struct gve_priv *priv); +void gve_teardown_clock(struct gve_priv *priv); +#else /* CONFIG_PTP_1588_CLOCK */ +static inline int gve_init_clock(struct gve_priv *priv) +{ + return -EOPNOTSUPP; +} + +static inline void gve_teardown_clock(struct gve_priv *priv) { } +#endif /* CONFIG_PTP_1588_CLOCK */ /* report stats handling */ void gve_handle_report_stats(struct gve_priv *priv); /* exported by ethtool.c */ diff --git a/drivers/net/ethernet/google/gve/gve_ptp.c b/drivers/net/ethern= et/google/gve/gve_ptp.c index 293f8dd49afe..b6e18ad20fa9 100644 --- a/drivers/net/ethernet/google/gve/gve_ptp.c +++ b/drivers/net/ethernet/google/gve/gve_ptp.c @@ -5,13 +5,52 @@ */ =20 #include "gve.h" +#include "gve_adminq.h" + +/* Interval to schedule a nic timestamp calibration, 250ms. */ +#define GVE_NIC_TS_SYNC_INTERVAL_MS 250 + +/* Read the nic timestamp from hardware via the admin queue. */ +static int gve_clock_nic_ts_read(struct gve_priv *priv) +{ + u64 nic_raw; + int err; + + err =3D gve_adminq_report_nic_ts(priv, priv->nic_ts_report_bus); + if (err) + return err; + + nic_raw =3D be64_to_cpu(priv->nic_ts_report->nic_timestamp); + WRITE_ONCE(priv->last_sync_nic_counter, nic_raw); + + return 0; +} + +static long gve_ptp_do_aux_work(struct ptp_clock_info *info) +{ + const struct gve_ptp *ptp =3D container_of(info, struct gve_ptp, info); + struct gve_priv *priv =3D ptp->priv; + int err; + + if (gve_get_reset_in_progress(priv) || !gve_get_admin_queue_ok(priv)) + goto out; + + err =3D gve_clock_nic_ts_read(priv); + if (err && net_ratelimit()) + dev_err(&priv->pdev->dev, + "%s read err %d\n", __func__, err); + +out: + return msecs_to_jiffies(GVE_NIC_TS_SYNC_INTERVAL_MS); +} =20 static const struct ptp_clock_info gve_ptp_caps =3D { .owner =3D THIS_MODULE, .name =3D "gve clock", + .do_aux_work =3D gve_ptp_do_aux_work, }; =20 -static int __maybe_unused gve_ptp_init(struct gve_priv *priv) +static int gve_ptp_init(struct gve_priv *priv) { struct gve_ptp *ptp; int err; @@ -44,7 +83,29 @@ static int __maybe_unused gve_ptp_init(struct gve_priv *= priv) return err; } =20 -static void __maybe_unused gve_ptp_release(struct gve_priv *priv) +int gve_init_clock(struct gve_priv *priv) +{ + int err; + + err =3D gve_ptp_init(priv); + if (err) + return err; + + priv->nic_ts_report =3D + dma_alloc_coherent(&priv->pdev->dev, + sizeof(struct gve_nic_ts_report), + &priv->nic_ts_report_bus, + GFP_KERNEL); + if (!priv->nic_ts_report) { + dev_err(&priv->pdev->dev, "%s dma alloc error\n", __func__); + return -ENOMEM; + } + + ptp_schedule_worker(priv->ptp->clock, 0); + return 0; +} + +static void gve_ptp_release(struct gve_priv *priv) { struct gve_ptp *ptp =3D priv->ptp; =20 @@ -57,3 +118,15 @@ static void __maybe_unused gve_ptp_release(struct gve_p= riv *priv) kfree(ptp); priv->ptp =3D NULL; } + +void gve_teardown_clock(struct gve_priv *priv) +{ + gve_ptp_release(priv); + + if (priv->nic_ts_report) { + dma_free_coherent(&priv->pdev->dev, + sizeof(struct gve_nic_ts_report), + priv->nic_ts_report, priv->nic_ts_report_bus); + priv->nic_ts_report =3D NULL; + } +} --=20 2.49.0.1143.g0be31eac6b-goog