From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by dpdk.space (Postfix) with ESMTP id 5FE7CA0679 for ; Tue, 2 Apr 2019 19:46:22 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 8ECA25A4A; Tue, 2 Apr 2019 19:46:21 +0200 (CEST) Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by dpdk.org (Postfix) with ESMTP id 6DDA25681 for ; Tue, 2 Apr 2019 19:46:20 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga102.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 02 Apr 2019 10:46:19 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.60,301,1549958400"; d="scan'208";a="219903957" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.46]) ([10.237.221.46]) by orsmga001.jf.intel.com with ESMTP; 02 Apr 2019 10:46:16 -0700 To: Tom Barbette , dev@dpdk.org Cc: bruce.richardson@intel.com, john.mcnamara@intel.com, Thomas Monjalon , Andrew Rybchenko , Shahaf Shuler , Yongseok Koh , Olivier MATZ References: <20190327061935.19572-1-barbette@kth.se> <20190327061935.19572-2-barbette@kth.se> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; 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WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190327061935.19572-2-barbette@kth.se> Content-Type: text/plain; charset="UTF-8" Content-Language: en-US Content-Transfer-Encoding: 8bit Subject: Re: [dpdk-dev] [PATCH v2 1/3] rte_ethdev: Add API function to read dev clock X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" Message-ID: <20190402174616.0JYUW7ac0nGe_V3OksH9ekPmkbHADN8BeTxo8EO0v3s@z> On 3/27/2019 6:19 AM, Tom Barbette wrote: > Add rte_eth_read_clock to read the raw clock of a devide. > > The main use is to get the device clock conversion co-efficients to be > able to translate the raw clock of the timestamp field of the pkt mbuf > to a local synced time value. > > This function was missing to allow users to convert the RX timestamp field > to real time without the complexity of the rte_timesync* facility. One can > derivate the clock frequency by calling twice read_clock and then keep a > common time base. > > Signed-off-by: Tom Barbette > --- > doc/guides/nics/features.rst | 1 + > lib/librte_ethdev/rte_ethdev.c | 13 +++++++ > lib/librte_ethdev/rte_ethdev.h | 44 ++++++++++++++++++++++++ > lib/librte_ethdev/rte_ethdev_core.h | 6 ++++ > lib/librte_ethdev/rte_ethdev_version.map | 1 + > lib/librte_mbuf/rte_mbuf.h | 2 ++ > 6 files changed, 67 insertions(+) > > diff --git a/doc/guides/nics/features.rst b/doc/guides/nics/features.rst > index c5bf32222..1e6adfb0b 100644 > --- a/doc/guides/nics/features.rst > +++ b/doc/guides/nics/features.rst > @@ -602,6 +602,7 @@ Supports Timestamp. > * **[provides] mbuf**: ``mbuf.ol_flags:PKT_RX_TIMESTAMP``. > * **[provides] mbuf**: ``mbuf.timestamp``. > * **[provides] rte_eth_dev_info**: ``rx_offload_capa,rx_queue_offload_capa: DEV_RX_OFFLOAD_TIMESTAMP``. > +* **[implements] eth_dev_ops**: ``read_clock``. This means for a PMD to claim 'timestamp' support, it should implement the 'read_clock' dev_ops, is it really the case? Should we say 'related' instead of 'implements' ? > > .. _nic_features_macsec_offload: > > diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c > index 85c179496..7de0f35b5 100644 > --- a/lib/librte_ethdev/rte_ethdev.c > +++ b/lib/librte_ethdev/rte_ethdev.c > @@ -4127,6 +4127,19 @@ rte_eth_timesync_write_time(uint16_t port_id, const struct timespec *timestamp) > timestamp)); > } > > +int > +rte_eth_read_clock(uint16_t port_id, uint64_t *timestamp) > +{ > + struct rte_eth_dev *dev; > + > + RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV); > + dev = &rte_eth_devices[port_id]; > + > + RTE_FUNC_PTR_OR_ERR_RET(*dev->dev_ops->read_clock, -ENOTSUP); > + return eth_err(port_id, (*dev->dev_ops->read_clock)(dev, > + timestamp)); Please fix the syntax. > +} > + > int > rte_eth_dev_get_reg_info(uint16_t port_id, struct rte_dev_reg_info *info) > { > diff --git a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h > index a3c864a13..e254da8b1 100644 > --- a/lib/librte_ethdev/rte_ethdev.h > +++ b/lib/librte_ethdev/rte_ethdev.h > @@ -3642,6 +3642,50 @@ int rte_eth_timesync_read_time(uint16_t port_id, struct timespec *time); > */ > int rte_eth_timesync_write_time(uint16_t port_id, const struct timespec *time); > > +/** > + * @warning > + * @b EXPERIMENTAL: this API may change without prior notice. > + * > + * Read the current clock counter of an Ethernet device > + * > + * This returns the current raw clock value of an Ethernet device. > + * The value returned here is from the same clock than the one > + * filling timestamp field of RX packets. Therefore it can be used > + * to compute a precise conversion of the device clock to the real time. > + * > + * E.g, a simple heuristic to derivate the frequency would be: > + * uint64_t start, end; > + * rte_eth_read_clock(port, start); > + * rte_delay_ms(100); > + * rte_eth_read_clock(port, end); > + * double freq = (end - start) * 10; > + * > + * Compute a common reference with: > + * uint64_t base_time_sec = current_time(); > + * uint64_t base_clock; > + * rte_eth_read_clock(port, base_clock); > + * > + * Then, convert the raw mbuf timestamp with: > + * base_time_sec + (double)(mbuf->timestamp - base_clock) / freq; > + * > + * This simple example will not provide a very good accuracy. One must > + * at least measure multiple times the frequency and do a regression. > + * To avoid deviation from the system time, the common reference can > + * be repeated from time to time. The integer division can also be > + * converted by a multiplication and a shift for better performance. > + * > + * @param port_id > + * The port identifier of the Ethernet device. > + * @param time > + * Pointer to the uint64_t that holds the raw clock value. > + * > + * @return > + * - 0: Success. > + * - -ENODEV: The port ID is invalid. > + * - -ENOTSUP: The function is not supported by the Ethernet driver. Can PMD return a fail? > + */ > +int __rte_experimental rte_eth_read_clock(uint16_t port_id, uint64_t *time); s/time/timestamp to match implementation param name, (reminder of updating doxygen when this updated) And I can see both syntax in use currently, but I think specially with __rte_experimental tag, it looks cleaner to me as following: int __rte_experimental rte_eth_read_clock(uint16_t port_id, uint64_t *timestamp); > + > /** > * Config l2 tunnel ether type of an Ethernet device for filtering specific > * tunnel packets by ether type. > diff --git a/lib/librte_ethdev/rte_ethdev_core.h b/lib/librte_ethdev/rte_ethdev_core.h > index 8f03f83f6..86806b3eb 100644 > --- a/lib/librte_ethdev/rte_ethdev_core.h > +++ b/lib/librte_ethdev/rte_ethdev_core.h > @@ -322,6 +322,10 @@ typedef int (*eth_timesync_write_time)(struct rte_eth_dev *dev, > const struct timespec *timestamp); > /**< @internal Function used to get time from the device clock */ > > +typedef int (*eth_read_clock)(struct rte_eth_dev *dev, > + uint64_t *timestamp); > +/**< @internal Function used to get the current value of the device clock. */ > + > typedef int (*eth_get_reg_t)(struct rte_eth_dev *dev, > struct rte_dev_reg_info *info); > /**< @internal Retrieve registers */ > @@ -496,6 +500,8 @@ struct eth_dev_ops { > eth_timesync_read_time timesync_read_time; /** Get the device clock time. */ > eth_timesync_write_time timesync_write_time; /** Set the device clock time. */ > > + eth_read_clock read_clock; > + Isn't this ABI breakage? I guess it can be OK since we already increasing the ethdev ABIVER this version, any comments? > eth_xstats_get_by_id_t xstats_get_by_id; > /**< Get extended device statistic values by ID. */ > eth_xstats_get_names_by_id_t xstats_get_names_by_id; > diff --git a/lib/librte_ethdev/rte_ethdev_version.map b/lib/librte_ethdev/rte_ethdev_version.map > index 92ac3de25..12d6c3c1d 100644 > --- a/lib/librte_ethdev/rte_ethdev_version.map > +++ b/lib/librte_ethdev/rte_ethdev_version.map > @@ -249,6 +249,7 @@ EXPERIMENTAL { > rte_eth_switch_domain_free; > rte_flow_conv; > rte_flow_expand_rss; > + rte_eth_read_clock; Can you please put this alphabetically sorted? > rte_mtr_capabilities_get; > rte_mtr_create; > rte_mtr_destroy; > diff --git a/lib/librte_mbuf/rte_mbuf.h b/lib/librte_mbuf/rte_mbuf.h > index d961ccaf6..dd55b942c 100644 > --- a/lib/librte_mbuf/rte_mbuf.h > +++ b/lib/librte_mbuf/rte_mbuf.h > @@ -619,6 +619,8 @@ struct rte_mbuf { > > /** Valid if PKT_RX_TIMESTAMP is set. The unit and time reference > * are not normalized but are always the same for a given port. > + * Some devices allow to query rte_eth_read_clock that will return the > + * current device timestamp. cc'ed Olivier. > */ > uint64_t timestamp; > >