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Miller" , UNGLinuxDriver@microchip.com, Alexandre Belloni , Claudiu Manoil , Vladimir Oltean Subject: [PATCH v6 net-next 0/5] use bulk reads for ocelot statistics Date: Wed, 9 Feb 2022 20:13:40 -0800 Message-Id: <20220210041345.321216-1-colin.foster@in-advantage.com> X-Mailer: git-send-email 2.25.1 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: MW4PR04CA0084.namprd04.prod.outlook.com (2603:10b6:303:6b::29) To DM5PR1001MB2345.namprd10.prod.outlook.com (2603:10b6:4:2d::31) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 182bb424-70ae-46de-c9ab-08d9ec4bfb0c X-MS-TrafficTypeDiagnostic: BN7PR10MB2564:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:346; X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM5PR1001MB2345.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230001)(346002)(42606007)(366004)(39830400003)(396003)(376002)(136003)(316002)(66946007)(86362001)(508600001)(8676002)(38350700002)(8936002)(4326008)(38100700002)(2616005)(54906003)(66476007)(66556008)(5660300002)(26005)(44832011)(6486002)(6512007)(2906002)(6506007)(6666004)(83380400001)(36756003)(52116002)(186003)(1076003);DIR:OUT;SFP:1102; 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These regions are mostly continuous, and are ordered. This patch set uses that information to break the stats reads into regions that can get read in bulk. The motiviation is for general cleanup, but also for SPI. Performing two back-to-back reads on a SPI bus require toggling the CS line, holding, re-toggling the CS line, sending 3 address bytes, sending N padding bytes, then actually performing the read. Bulk reads could reduce almost all of that overhead, but require that the reads are performed via regmap_bulk_read. Verified with eth0 hooked up to the CPU port: # ethtool -S eth0 | grep -v ": 0" NIC statistics: Good Rx Frames: 8352 Rx Octets: 10972241 Good Tx Frames: 1674 Tx Octets: 146253 Rx + Tx 65-127 Octet Frames: 2565 Rx + Tx 128-255 Octet Frames: 93 Rx + Tx 256-511 Octet Frames: 158 Rx + Tx 512-1023 Octet Frames: 271 Rx + Tx 1024-Up Octet Frames: 6939 Net Octets: 11118494 Rx DMA chan 0: head_enqueue: 1 Rx DMA chan 0: tail_enqueue: 8479 Rx DMA chan 0: busy_dequeue: 7614 Rx DMA chan 0: good_dequeue: 8352 Tx DMA chan 0: head_enqueue: 1335 Tx DMA chan 0: tail_enqueue: 339 Tx DMA chan 0: misqueued: 339 Tx DMA chan 0: empty_dequeue: 1335 Tx DMA chan 0: good_dequeue: 1674 p00_rx_octets: 146253 p00_rx_unicast: 1674 p00_rx_frames_65_to_127_octets: 1666 p00_rx_frames_128_to_255_octets: 7 p00_rx_frames_over_1526_octets: 1 p00_tx_octets: 10972241 p00_tx_unicast: 8352 p00_tx_frames_65_to_127_octets: 899 p00_tx_frames_128_255_octets: 86 p00_tx_frames_256_511_octets: 158 p00_tx_frames_512_1023_octets: 271 p00_tx_frames_1024_1526_octets: 222 p00_tx_frames_over_1526_octets: 6716 p00_tx_green_prio_0: 8352 And with swp2 connected to swp3 with STP enabled: # ethtool -S swp2 | grep -v ": 0" NIC statistics: tx_packets: 397 tx_bytes: 20634 rx_packets: 1 rx_bytes: 46 rx_octets: 64 rx_multicast: 1 rx_frames_below_65_octets: 1 rx_classified_drops: 1 tx_octets: 46586 tx_multicast: 404 tx_broadcast: 303 tx_frames_below_65_octets: 397 tx_frames_65_to_127_octets: 306 tx_frames_128_255_octets: 4 tx_green_prio_0: 311 tx_green_prio_7: 396 # ethtool -S swp3 | grep -v ": 0" NIC statistics: tx_packets: 1 tx_bytes: 52 rx_packets: 711 rx_bytes: 34050 rx_octets: 46848 rx_multicast: 406 rx_broadcast: 305 rx_frames_below_65_octets: 399 rx_frames_65_to_127_octets: 308 rx_frames_128_to_255_octets: 4 rx_classified_drops: 398 rx_green_prio_0: 313 tx_octets: 64 tx_multicast: 1 tx_frames_below_65_octets: 1 tx_green_prio_7: 1 v1 > v2: reword commit messages v2 > v3: correctly mark this for net-next when sending v3 > v4: calloc array instead of zalloc per review v4 > v5: Apply CR suggestions for whitespace Fix calloc / zalloc mixup Properly destroy workqueues Add third commit to split long macros v5 > v6: Fix functionality - v5 was improperly tested Add bugfix for ethtool mutex lock Remove unnecessary ethtool stats reads Colin Foster (5): net: mscc: ocelot: fix mutex lock error during ethtool stats read net: mscc: ocelot: remove unnecessary stat reading from ethtool net: ocelot: align macros for consistency net: mscc: ocelot: add ability to perform bulk reads net: mscc: ocelot: use bulk reads for stats drivers/net/ethernet/mscc/ocelot.c | 97 +++++++++++++++++++++------ drivers/net/ethernet/mscc/ocelot_io.c | 13 ++++ include/soc/mscc/ocelot.h | 57 +++++++++++----- 3 files changed, 132 insertions(+), 35 deletions(-) -- 2.25.1