From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 A0E812D9481; Wed, 27 May 2026 20:03:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779912192; cv=none; b=XpecAp+bzckKStOD3qYmbX+/BhHEHAu7SCJqcQzEY7TGqlfDHUtMoC3C6jJBGC+xwP70W3Pp3Ov4By7XqyQVcNebD8E9f122Do1hGBh9RLuGRcmyFL23XQZ0cVCsRr9DfD4aaE5+KXNm/2nhnl5u01buS6/zAQFSTOGMxc3E2Os= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779912192; c=relaxed/simple; bh=l4mVcEG32W6Cc3FqCyTUr4O0Ae0WWM2RJ/6xKw7nwqI=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=Ei0UoRCVrU0++x2tmFVFVGeLk5V71Wkt8enjPmRoqDvkHJfS7w9rMsSMDPXIfo1KSND+05LO92vaVnYFYntGVEPJvNTmYheSKZwDltY1yXmJCNeXenRqKLLVzLnkifpbbt9+e/WB+ruNor1J1xiuy2TXTVZjq7XBYuvRXq/xdx8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=dCCtwGMD; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="dCCtwGMD" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=fvVAdiDUzqRlC/TYLD/F1friIG13PMnpdANXao0ov6Y=; b=dCCtwGMDN1F559pwP4dRALluHf AasXnjqn4D3kp4rWl9sPGADzb+qfP0fbDtGipYnN5TGNaAxO6EKbJ/wmWVms4mrkKJj9LMJXbu0ps USWkQ6cbhBa0wMF/5ySzOSU/yBxzaslZDbRkyDnW5UP+9iSd74Sm5T/qi6JvvtdMGIPEx8eCuuR/s FnmcayknYbUj0OCSyBT/J7YnX3OFaEs7vXZwpG4U4BBXcAnJefxmrvsYyhvLopI76vJhP+XDq61CC g9H/hJCPdkRtLms8nu29ZanY6vS1GLO417JoAaHX37HmEdMxsKuZcBQN8Y+d0TxDCX5ZaYfPSXgWQ Cn/Gt+Fg==; Received: from 54-240-197-231.amazon.com ([54.240.197.231] helo=lhr50-en-acc-sw5.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wSKT0-00000003JJl-38ld; Wed, 27 May 2026 20:03:03 +0000 Message-ID: <4322b8df98c08e238d4161bfacd46080c54f2c40.camel@infradead.org> Subject: Re: [PATCH net-next v8 3/3] gve: implement PTP gettimex64 From: David Woodhouse To: Jordan Rhee , Thomas Gleixner Cc: Harshitha Ramamurthy , netdev@vger.kernel.org, joshwash@google.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, richardcochran@gmail.com, jstultz@google.com, sboyd@kernel.org, willemb@google.com, nktgrg@google.com, jfraker@google.com, ziweixiao@google.com, maolson@google.com, thostet@google.com, alok.a.tiwari@oracle.com, pkaligineedi@google.com, horms@kernel.org, jacob.e.keller@intel.com, yyd@google.com, jefrogers@google.com, linux-kernel@vger.kernel.org, Naman Gulati Date: Wed, 27 May 2026 21:03:01 +0100 In-Reply-To: References: <20260514225842.110706-1-hramamurthy@google.com> <20260514225842.110706-4-hramamurthy@google.com> <87mrxtwzz9.ffs@tglx> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-08Tdb1tbxYhteV/CSMX0" User-Agent: Evolution 3.52.3-0ubuntu1.1 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-08Tdb1tbxYhteV/CSMX0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2026-05-27 at 11:46 -0700, Jordan Rhee wrote: > Hello, >=20 > We would like to request the community's guidance on how to proceed > with adding > cross-timestamp functionality to GVE. The key challenge is that the > NIC clock can only be sampled in the hypervisor because the NIC time > registers are only present on the PF, and a hypercall takes 60-80us. > To minimize the uncertainty window, the hypervisor takes a TSC > sandwich around the reading with an uncertainty window of ~1.2us, > converts it to guest TSC, and returns it to the guest. >=20 > The goals which led to this implementation were to minimize the > uncertainty window and communicate the uncertainty window up the > stack. I've reviewed > https://lore.kernel.org/netdev/20260526165826.392227559@kernel.org/ > but I'm not sure how we would use it, so if it is intended to support > our use case I would appreciate if someone could explain how we > should use it. >=20 > Here are some options on how to proceed, but other ideas are welcome. So, your hypercall gives you the ABA timestamps of PTP_SYS_OFFSET_EXTENDED where the 'A' timestamps are in the form of guest TSC readings? It does not give you *simultaneous* capture and thus you can not, and should attempt to, implement PTP_SYS_OFFSET_PRECISE? Don't even think about that "midpoint" crap? And your driver brackets the hypercalls with *actual* guest TSC reads, to keep the hypervisor honest? Based on Thomas's branch, I'd probably do something like: =E2=80=A2 ptp_read_system_prets() =E2=80=A2 Make the hypercall =E2=80=A2 ptp_read_system_postts() Then do your sanity check that the guest TSC values provided by the hypervisor are reasonable (inside the raw_cycles=C2=B9 values in the guest pre/post snapshots). If not, return immediately using the wider uncertainty window. If you *do* believe the hypervisor-provided TSC readings, can't you convert *each* of them to the system clock using get_device_system_crosststamp(), a history from your captured prets, and a get_time_fn callback that just creates xtstamp->sys_counter from the hypervisor-provided TSC value for pre/post respectively, each time you call it? Take the code sample below with a *massive* pinch of salt; I only shouted at the AI a few times when asking it to translate the suggestion above into sample code, and I haven't gone over it with a fine-tooth comb. But hopefully it helps enlighten what I'm suggesting... /* * Suggested approach for GVE PTP gettimex64 with hypervisor-provided * TSC values converted via get_device_system_crosststamp(). * * This gives PTP_SYS_OFFSET_EXTENDED with ~1.2=C2=B5s uncertainty * (from the hypervisor's TSC sandwich) rather than ~60-80=C2=B5s * (from the guest-side hypercall latency). */ struct gve_xtstamp_ctx { u64 cycles; }; static int gve_get_time_fn(ktime_t *device_time, struct system_counterval_t *sys_counter, void *_ctx) { struct gve_xtstamp_ctx *ctx =3D _ctx; *device_time =3D 0; sys_counter->cycles =3D ctx->cycles; sys_counter->cs_id =3D CSID_X86_TSC; return 0; } static int gve_ptp_gettimex64(struct ptp_clock_info *info, struct timespec64 *ts, struct ptp_system_timestamp *sts) { struct gve_ptp *ptp =3D container_of(info, struct gve_ptp, info); struct gve_sysclock_sample sysclock; u64 nic_ts; int err; mutex_lock(&ptp->nic_ts_read_lock); ptp_read_system_prets(sts); err =3D gve_ptp_read_timestamp(ptp, &sysclock); ptp_read_system_postts(sts); mutex_unlock(&ptp->nic_ts_read_lock); if (err) return err; nic_ts =3D sysclock.nic_timestamp; *ts =3D ns_to_timespec64(nic_ts); if (!sts) return 0; /* * Sanity check: hypervisor-provided TSC values must fall * within our guest-side bracket (using raw_cycles from the * snapshots taken by ptp_read_system_prets/postts). */ if (sysclock.nic_pre_cycles >=3D sts->pre_sts.raw_cycles && sysclock.nic_post_cycles <=3D sts->post_sts.raw_cycles) { struct system_device_crosststamp xtstamp; struct gve_xtstamp_ctx ctx; /* * Hypervisor values are trustworthy. Convert each TSC * value to system time, narrowing the pre/post window * from ~60-80=C2=B5s to ~1.2=C2=B5s. */ ctx.cycles =3D sysclock.nic_pre_cycles; err =3D get_device_system_crosststamp(gve_get_time_fn, &ctx, &sts->pre_sts, &xtstamp); if (!err) { sts->pre_sts.sys =3D xtstamp.sys_realtime; sts->pre_sts.raw =3D xtstamp.sys_monoraw; sts->pre_sts.cycles =3D sysclock.nic_pre_cycles; sts->pre_sts.cs_id =3D CSID_X86_TSC; } ctx.cycles =3D sysclock.nic_post_cycles; err =3D get_device_system_crosststamp(gve_get_time_fn, &ctx, &sts->pre_sts, &xtstamp); if (!err) { sts->post_sts.sys =3D xtstamp.sys_realtime; sts->post_sts.raw =3D xtstamp.sys_monoraw; sts->post_sts.cycles =3D sysclock.nic_post_cycles; sts->post_sts.cs_id =3D CSID_X86_TSC; } } /* else: keep the wider pre/post from ptp_read_system_prets/postts */ return 0; } =C2=B9 https://lore.kernel.org/all/20260526230635.136914-1-dwmw2@infradead.= org/ --=-08Tdb1tbxYhteV/CSMX0 Content-Type: application/pkcs7-signature; name="smime.p7s" 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