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Tue, 5 Nov 2024 11:33:12 +0000 Date: Tue, 5 Nov 2024 11:33:07 +0000 From: Bruce Richardson To: Soumyadeep Hore CC: , , , Subject: Re: [PATCH v4] net/ice: fix incorrect reading of PHY timestamp Message-ID: References: <20241104103112.885071-1-soumyadeep.hore@intel.com> <20241105101419.888975-1-soumyadeep.hore@intel.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20241105101419.888975-1-soumyadeep.hore@intel.com> X-ClientProxiedBy: DU2PR04CA0217.eurprd04.prod.outlook.com (2603:10a6:10:2b1::12) To DS0PR11MB7309.namprd11.prod.outlook.com (2603:10b6:8:13e::17) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR11MB7309:EE_|CY8PR11MB6914:EE_ X-MS-Office365-Filtering-Correlation-Id: 2315516e-d801-4c91-9331-08dcfd8da18e X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|1800799024; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?+SGykF9DjotFf5Bb34pkIfTsYpR2GlFafZKWgc4VRNKtL7nWNvsFTDekoYoB?= =?us-ascii?Q?CR+8Bv8FT7RPMfoxJDnquNQtCtFuk53o/zAhNCIeIq8UeTRKIehKdwl5cTHJ?= =?us-ascii?Q?IJ0BmnDSEJNtPhA+EmnXPyE8GVJPOIRLogeqYcmPKXa5QBQqP3Kh6UBvvDsK?= =?us-ascii?Q?PnVjOjGkQWPLGk8uLTHm5PTnSlHOB4gqMRIUmDJuB+BaDrflRQyqyVLUi2HJ?= =?us-ascii?Q?HTT1wJmh6heZSHDEM9rNaPFxAEvhSvuOkkczezoYlYPomkpdpUxWTh4NxKdC?= =?us-ascii?Q?YEd68mfGSxNQ2m7aWvAMNNDbt05oJZwbCuW663MGv/XBGTMUpTRei1DIsE0Y?= =?us-ascii?Q?wBrNsSX1M5NpFuPFc8wAfANHra/V1XECtBMYmIYdaGVYqIAnD8AJirJxqAT0?= =?us-ascii?Q?ic3qJG5cwPeGz0NbQCiaNyVGrofjC9Yn9h4uAP7mY6nGfqpj6TSvly0Atubx?= =?us-ascii?Q?axPFRlgkO691VImbBFMhfMaEvO+49uC0+NVgYjMeumHi/pgaap4i8/1DQpWd?= =?us-ascii?Q?FWOnVS544Sud7q2GXUmEhDgduILXnKWV2JAtl/Q+kFsnZsK0wcBY0PhfKPWe?= =?us-ascii?Q?+HbuesDj79XFqGdFWKEL+nKST4L3wuC7Ym645qalIS7vdOAxsSYgJcU61WM4?= =?us-ascii?Q?2Uz/qdTKIvMVAQ/NWskISxjkXC55vceCPmo8rRuso6jfiVKSTV4iiNWKQfVS?= =?us-ascii?Q?SArlCr8u9Cx09fxPKQ5XsR7HlvEAOyBxeiXyk4jM6rk13V8LK53NhSeGTsa4?= =?us-ascii?Q?gtzsw41EmE4P/U4m9ax52k90HBbcKuIBfFEq+oO/Mlw2gG8siWvM7FYxPz7J?= =?us-ascii?Q?Umpb/cwphT5ft6WqXNRUxeI8cotMVGG3GIlnxd3IeRd4UqKCQPyieXespxPZ?= =?us-ascii?Q?J8noe7YalH5pvVJHCcT+1vc9hqOmgnFmAX8Nx4sDb6Nubw4XOyi8pJP1Lqew?= =?us-ascii?Q?/Fe/RhrDSU5dwijBX5BQ3Ont8bnT65GTb3Y41SyLpxL55lvuN+YAOu7pzZtA?= =?us-ascii?Q?nfw2AQ/ocZjod1jBOUl/KDHyjZr+2tmMDmP2qI76eEBBnkQj16ZZbeRD3QsG?= =?us-ascii?Q?VkAPdpOR1NS0k5lbUCP+pMBjOPkGdufJ0kF+/SJcOkkA0EcdtRRF9AfQeFx9?= =?us-ascii?Q?zdHFulwqMnl5U7snOg0IU8dBMLiNfkX8DQP7RPsb1XJ1VLQ/rabMOcbANn7S?= =?us-ascii?Q?uptJBSmumge3dQieTR+zMGZ7LvWAJZLW+qt99GRPtaw4HgC49/9VYBrtBbLQ?= =?us-ascii?Q?ZKZPnL/M0Mt0oX1Ez5b11cdDUbgbqUxjecjWA6pk+WHiBZwtIhtE1HVozZcb?= =?us-ascii?Q?odoaIHN6SvlTnDkysVmcRRGl?= X-Forefront-Antispam-Report: CIP:255.255.255.255; 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This caused incorrect Tx > timestamping. > > The ready bitmap checking is enabled and PHY timestamp is read once > the ready bitmap gives positive value. > > Fixes: 881169950d80 ("net/ice/base: implement initial PTP support for E830") > Cc: stable@dpdk.org > > Signed-off-by: Soumyadeep Hore > --- > v4: > - Addressed Bruce comments for do while loop introduction > --- > v3: > - Decreased the end time delay from 1 second to 10 microseconds > --- > v2: > - Addressed Bruce's comments > --- > drivers/net/ice/ice_ethdev.c | 19 ++++++++++++++++++- > 1 file changed, 18 insertions(+), 1 deletion(-) > > diff --git a/drivers/net/ice/ice_ethdev.c b/drivers/net/ice/ice_ethdev.c > index 70298ac330..7e2c6107ff 100644 > --- a/drivers/net/ice/ice_ethdev.c > +++ b/drivers/net/ice/ice_ethdev.c > @@ -6597,10 +6597,27 @@ ice_timesync_read_tx_timestamp(struct rte_eth_dev *dev, > struct ice_hw *hw = ICE_DEV_PRIVATE_TO_HW(dev->data->dev_private); > struct ice_adapter *ad = > ICE_DEV_PRIVATE_TO_ADAPTER(dev->data->dev_private); > - uint64_t ts_ns, tstamp; > + uint64_t ts_ns, tstamp, tstamp_ready = 0; > + uint64_t end_time; > const uint64_t mask = 0xFFFFFFFF; > int ret; > > + /* Set the end time with a delay of 10 microseconds */ > + end_time = rte_get_timer_cycles() + (rte_get_timer_hz() / 100000); > + > + do { > + ret = ice_get_phy_tx_tstamp_ready(hw, ad->ptp_tx_block, &tstamp_ready); > + if (ret) { > + PMD_DRV_LOG(ERR, "Failed to get phy ready for timestamp"); > + return -1; > + } > + > + if (rte_get_timer_cycles() > end_time) { > + PMD_DRV_LOG(ERR, "Timeout to get phy ready for timestamp"); > + return -1; > + } > + } while ((tstamp_ready & BIT_ULL(0)) == 0); > + Unfortunately, this is still not quite right. The important change in my last feedback was not the introduction of the do-while, but the switching of the two blocks inside the while loop, or the adding of an additional check to the timer expiry. You need to check that the bit is still not set before checking for timer expiry. When "get_timer_cycles() > end_time", it may also be the case that (tstamp_ready & BIT_ULL(0)) != 0, in which case you want to continue rather than returning error. /Bruce