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Miller" , Alexander Duyck CC: Vadim Fedorenko , , "Richard Cochran" Subject: [PATCH net-next v2 2/5] eth: fbnic: add initial PHC support Date: Thu, 12 Sep 2024 09:31:20 -0700 Message-ID: <20240912163123.551882-3-vadfed@meta.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20240912163123.551882-1-vadfed@meta.com> References: <20240912163123.551882-1-vadfed@meta.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Proofpoint-GUID: UuQHIOtR3k0GX2B2JXSAEN43SMMDsePa X-Proofpoint-ORIG-GUID: UuQHIOtR3k0GX2B2JXSAEN43SMMDsePa X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-12_05,2024-09-12_01,2024-09-02_01 X-Patchwork-Delegate: kuba@kernel.org Create PHC device and provide callbacks needed for ptp_clock device. Signed-off-by: Vadim Fedorenko --- drivers/net/ethernet/meta/fbnic/Makefile | 3 +- drivers/net/ethernet/meta/fbnic/fbnic.h | 11 + drivers/net/ethernet/meta/fbnic/fbnic_csr.h | 38 +++ .../net/ethernet/meta/fbnic/fbnic_netdev.c | 11 +- .../net/ethernet/meta/fbnic/fbnic_netdev.h | 15 + drivers/net/ethernet/meta/fbnic/fbnic_pci.c | 9 +- drivers/net/ethernet/meta/fbnic/fbnic_time.c | 311 ++++++++++++++++++ 7 files changed, 394 insertions(+), 4 deletions(-) create mode 100644 drivers/net/ethernet/meta/fbnic/fbnic_time.c diff --git a/drivers/net/ethernet/meta/fbnic/Makefile b/drivers/net/ethernet/meta/fbnic/Makefile index ed4533a73c57..8615d516a274 100644 --- a/drivers/net/ethernet/meta/fbnic/Makefile +++ b/drivers/net/ethernet/meta/fbnic/Makefile @@ -18,4 +18,5 @@ fbnic-y := fbnic_devlink.o \ fbnic_phylink.o \ fbnic_rpc.o \ fbnic_tlv.o \ - fbnic_txrx.o + fbnic_txrx.o \ + fbnic_time.o diff --git a/drivers/net/ethernet/meta/fbnic/fbnic.h b/drivers/net/ethernet/meta/fbnic/fbnic.h index 0f9e8d79461c..ca59261f0155 100644 --- a/drivers/net/ethernet/meta/fbnic/fbnic.h +++ b/drivers/net/ethernet/meta/fbnic/fbnic.h @@ -6,6 +6,7 @@ #include #include +#include #include #include @@ -49,6 +50,16 @@ struct fbnic_dev { /* Number of TCQs/RCQs available on hardware */ u16 max_num_queues; + /* Lock protecting writes to @time_high, @time_offset of fbnic_netdev, + * and the HW time CSR machinery. + */ + spinlock_t time_lock; + /* Externally accessible PTP clock, may be NULL */ + struct ptp_clock *ptp; + struct ptp_clock_info ptp_info; + /* Last @time_high refresh time in jiffies (to catch stalls) */ + unsigned long last_read; + /* Local copy of hardware statistics */ struct fbnic_hw_stats hw_stats; }; diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_csr.h b/drivers/net/ethernet/meta/fbnic/fbnic_csr.h index 21db509acbc1..290b924b7749 100644 --- a/drivers/net/ethernet/meta/fbnic/fbnic_csr.h +++ b/drivers/net/ethernet/meta/fbnic/fbnic_csr.h @@ -413,6 +413,44 @@ enum { #define FBNIC_TMI_DROP_CTRL 0x04401 /* 0x11004 */ #define FBNIC_TMI_DROP_CTRL_EN CSR_BIT(0) #define FBNIC_CSR_END_TMI 0x0443f /* CSR section delimiter */ + +/* Precision Time Protocol Registers */ +#define FBNIC_CSR_START_PTP 0x04800 /* CSR section delimiter */ +#define FBNIC_PTP_REG_BASE 0x04800 /* 0x12000 */ + +#define FBNIC_PTP_CTRL 0x04800 /* 0x12000 */ +#define FBNIC_PTP_CTRL_EN CSR_BIT(0) +#define FBNIC_PTP_CTRL_MONO_EN CSR_BIT(4) +#define FBNIC_PTP_CTRL_TQS_OUT_EN CSR_BIT(8) +#define FBNIC_PTP_CTRL_MAC_OUT_IVAL CSR_GENMASK(16, 12) +#define FBNIC_PTP_CTRL_TICK_IVAL CSR_GENMASK(23, 20) + +#define FBNIC_PTP_ADJUST 0x04801 /* 0x12004 */ +#define FBNIC_PTP_ADJUST_INIT CSR_BIT(0) +#define FBNIC_PTP_ADJUST_SUB_NUDGE CSR_BIT(8) +#define FBNIC_PTP_ADJUST_ADD_NUDGE CSR_BIT(16) +#define FBNIC_PTP_ADJUST_ADDEND_SET CSR_BIT(24) + +#define FBNIC_PTP_INIT_HI 0x04802 /* 0x12008 */ +#define FBNIC_PTP_INIT_LO 0x04803 /* 0x1200c */ + +#define FBNIC_PTP_NUDGE_NS 0x04804 /* 0x12010 */ +#define FBNIC_PTP_NUDGE_SUBNS 0x04805 /* 0x12014 */ + +#define FBNIC_PTP_ADD_VAL_NS 0x04806 /* 0x12018 */ +#define FBNIC_PTP_ADD_VAL_NS_MASK CSR_GENMASK(15, 0) +#define FBNIC_PTP_ADD_VAL_SUBNS 0x04807 /* 0x1201c */ + +#define FBNIC_PTP_CTR_VAL_HI 0x04808 /* 0x12020 */ +#define FBNIC_PTP_CTR_VAL_LO 0x04809 /* 0x12024 */ + +#define FBNIC_PTP_MONO_PTP_CTR_HI 0x0480a /* 0x12028 */ +#define FBNIC_PTP_MONO_PTP_CTR_LO 0x0480b /* 0x1202c */ + +#define FBNIC_PTP_CDC_FIFO_STATUS 0x0480c /* 0x12030 */ +#define FBNIC_PTP_SPARE 0x0480d /* 0x12034 */ +#define FBNIC_CSR_END_PTP 0x0480d /* CSR section delimiter */ + /* Rx Buffer Registers */ #define FBNIC_CSR_START_RXB 0x08000 /* CSR section delimiter */ enum { diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c b/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c index a400616a24d4..6e6d8988db54 100644 --- a/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c +++ b/drivers/net/ethernet/meta/fbnic/fbnic_netdev.c @@ -42,18 +42,24 @@ int __fbnic_open(struct fbnic_net *fbn) goto free_resources; } - err = fbnic_fw_init_heartbeat(fbd, false); + err = fbnic_time_start(fbn); if (err) goto release_ownership; + err = fbnic_fw_init_heartbeat(fbd, false); + if (err) + goto time_stop; + err = fbnic_pcs_irq_enable(fbd); if (err) - goto release_ownership; + goto time_stop; /* Pull the BMC config and initialize the RPC */ fbnic_bmc_rpc_init(fbd); fbnic_rss_reinit(fbd, fbn); return 0; +time_stop: + fbnic_time_stop(fbn); release_ownership: fbnic_fw_xmit_ownership_msg(fbn->fbd, false); free_resources: @@ -82,6 +88,7 @@ static int fbnic_stop(struct net_device *netdev) fbnic_down(fbn); fbnic_pcs_irq_disable(fbn->fbd); + fbnic_time_stop(fbn); fbnic_fw_xmit_ownership_msg(fbn->fbd, false); fbnic_free_resources(fbn); diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_netdev.h b/drivers/net/ethernet/meta/fbnic/fbnic_netdev.h index 6c27da09a612..f530e3235634 100644 --- a/drivers/net/ethernet/meta/fbnic/fbnic_netdev.h +++ b/drivers/net/ethernet/meta/fbnic/fbnic_netdev.h @@ -33,6 +33,15 @@ struct fbnic_net { u8 fec; u8 link_mode; + /* Cached top bits of the HW time counter for 40b -> 64b conversion */ + u32 time_high; + /* Protect readers of @time_offset, writers take @time_lock. */ + struct u64_stats_sync time_seq; + /* Offset in ns between free running NIC PHC and time set via PTP + * clock callbacks + */ + s64 time_offset; + u16 num_tx_queues; u16 num_rx_queues; @@ -60,6 +69,12 @@ void fbnic_reset_queues(struct fbnic_net *fbn, unsigned int tx, unsigned int rx); void fbnic_set_ethtool_ops(struct net_device *dev); +int fbnic_ptp_setup(struct fbnic_dev *fbd); +void fbnic_ptp_destroy(struct fbnic_dev *fbd); +void fbnic_time_init(struct fbnic_net *fbn); +int fbnic_time_start(struct fbnic_net *fbn); +void fbnic_time_stop(struct fbnic_net *fbn); + void __fbnic_set_rx_mode(struct net_device *netdev); void fbnic_clear_rx_mode(struct net_device *netdev); diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_pci.c b/drivers/net/ethernet/meta/fbnic/fbnic_pci.c index a4809fe0fc24..32e5b4cc55bd 100644 --- a/drivers/net/ethernet/meta/fbnic/fbnic_pci.c +++ b/drivers/net/ethernet/meta/fbnic/fbnic_pci.c @@ -300,14 +300,20 @@ static int fbnic_probe(struct pci_dev *pdev, const struct pci_device_id *ent) goto init_failure_mode; } + err = fbnic_ptp_setup(fbd); + if (err) + goto ifm_free_netdev; + err = fbnic_netdev_register(netdev); if (err) { dev_err(&pdev->dev, "Netdev registration failed: %d\n", err); - goto ifm_free_netdev; + goto ifm_destroy_ptp; } return 0; +ifm_destroy_ptp: + fbnic_ptp_destroy(fbd); ifm_free_netdev: fbnic_netdev_free(fbd); init_failure_mode: @@ -342,6 +348,7 @@ static void fbnic_remove(struct pci_dev *pdev) fbnic_netdev_unregister(netdev); cancel_delayed_work_sync(&fbd->service_task); + fbnic_ptp_destroy(fbd); fbnic_netdev_free(fbd); } diff --git a/drivers/net/ethernet/meta/fbnic/fbnic_time.c b/drivers/net/ethernet/meta/fbnic/fbnic_time.c new file mode 100644 index 000000000000..f79b1388cb6e --- /dev/null +++ b/drivers/net/ethernet/meta/fbnic/fbnic_time.c @@ -0,0 +1,311 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (c) Meta Platforms, Inc. and affiliates. */ + +#include +#include +#include +#include +#include + +#include "fbnic.h" +#include "fbnic_csr.h" +#include "fbnic_netdev.h" + +/* FBNIC timing & PTP implementation + * Datapath uses truncated 40b timestamps for scheduling and event reporting. + * We need to promote those to full 64b, hence we periodically cache the top + * 32bit of the HW time counter. Since this makes our time reporting non-atomic + * we leave the HW clock free running and adjust time offsets in SW as needed. + * Time offset is 64bit - we need a seq counter for 32bit machines. + * Time offset and the cache of top bits are independent so we don't need + * a coherent snapshot of both - READ_ONCE()/WRITE_ONCE() + writer side lock + * are enough. + */ + +/* Period of refresh of top bits of timestamp, give ourselves a 8x margin. + * This should translate to once a minute. + * The use of nsecs_to_jiffies() should be safe for a <=40b nsec value. + */ +#define FBNIC_TS_HIGH_REFRESH_JIF nsecs_to_jiffies((1ULL << 40) / 16) + +static struct fbnic_dev *fbnic_from_ptp_info(struct ptp_clock_info *ptp) +{ + return container_of(ptp, struct fbnic_dev, ptp_info); +} + +/* This function is "slow" because we could try guessing which high part + * is correct based on low instead of re-reading, and skip reading @hi + * twice altogether if @lo is far enough from 0. + */ +static u64 __fbnic_time_get_slow(struct fbnic_dev *fbd) +{ + u32 hi, lo; + + lockdep_assert_held(&fbd->time_lock); + + do { + hi = fbnic_rd32(fbd, FBNIC_PTP_CTR_VAL_HI); + lo = fbnic_rd32(fbd, FBNIC_PTP_CTR_VAL_LO); + } while (hi != fbnic_rd32(fbd, FBNIC_PTP_CTR_VAL_HI)); + + return (u64)hi << 32 | lo; +} + +static void __fbnic_time_set_addend(struct fbnic_dev *fbd, u64 addend) +{ + lockdep_assert_held(&fbd->time_lock); + + fbnic_wr32(fbd, FBNIC_PTP_ADD_VAL_NS, + FIELD_PREP(FBNIC_PTP_ADD_VAL_NS_MASK, addend >> 32)); + fbnic_wr32(fbd, FBNIC_PTP_ADD_VAL_SUBNS, (u32)addend); +} + +static void fbnic_ptp_fresh_check(struct fbnic_dev *fbd) +{ + if (time_is_after_jiffies(fbd->last_read + + FBNIC_TS_HIGH_REFRESH_JIF * 3 / 2)) + return; + + dev_warn(fbd->dev, "NIC timestamp refresh stall, delayed by %lu sec\n", + (jiffies - fbd->last_read - FBNIC_TS_HIGH_REFRESH_JIF) / HZ); +} + +static void fbnic_ptp_refresh_time(struct fbnic_dev *fbd, struct fbnic_net *fbn) +{ + unsigned long flags; + u32 hi; + + spin_lock_irqsave(&fbd->time_lock, flags); + hi = fbnic_rd32(fbn->fbd, FBNIC_PTP_CTR_VAL_HI); + if (!fbnic_present(fbd)) + goto out; /* Don't bother handling, reset is pending */ + WRITE_ONCE(fbn->time_high, hi); + fbd->last_read = jiffies; + out: + spin_unlock_irqrestore(&fbd->time_lock, flags); +} + +static long fbnic_ptp_do_aux_work(struct ptp_clock_info *ptp) +{ + struct fbnic_dev *fbd = fbnic_from_ptp_info(ptp); + struct fbnic_net *fbn; + + fbn = netdev_priv(fbd->netdev); + + fbnic_ptp_fresh_check(fbd); + fbnic_ptp_refresh_time(fbd, fbn); + + return FBNIC_TS_HIGH_REFRESH_JIF; +} + +static int fbnic_ptp_adjfine(struct ptp_clock_info *ptp, long scaled_ppm) +{ + int scale = 16; /* scaled_ppm has 16 fractional places */ + struct fbnic_dev *fbd = fbnic_from_ptp_info(ptp); + u64 scaled_delta, dclk_period; + unsigned long flags; + s64 delta; + int sgn; + + sgn = scaled_ppm >= 0 ? 1 : -1; + scaled_ppm *= sgn; + + /* d_clock is 600 MHz; which in Q16.32 fixed point ns is: */ + dclk_period = (((u64)1000000000) << 32) / FBNIC_CLOCK_FREQ; + + while (scaled_ppm > U64_MAX / dclk_period) { + scaled_ppm >>= 1; + scale--; + } + + scaled_delta = (u64)scaled_ppm * dclk_period; + delta = div_u64(scaled_delta, 1000 * 1000) >> scale; + delta *= sgn; + + spin_lock_irqsave(&fbd->time_lock, flags); + __fbnic_time_set_addend(fbd, dclk_period + delta); + fbnic_wr32(fbd, FBNIC_PTP_ADJUST, FBNIC_PTP_ADJUST_ADDEND_SET); + + /* Flush, make sure FBNIC_PTP_ADD_VAL_* is stable for at least 4 clks */ + fbnic_rd32(fbd, FBNIC_PTP_SPARE); + spin_unlock_irqrestore(&fbd->time_lock, flags); + + return fbnic_present(fbd) ? 0 : -EIO; +} + +static int fbnic_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta) +{ + struct fbnic_dev *fbd = fbnic_from_ptp_info(ptp); + struct fbnic_net *fbn; + unsigned long flags; + + fbn = netdev_priv(fbd->netdev); + + spin_lock_irqsave(&fbd->time_lock, flags); + u64_stats_update_begin(&fbn->time_seq); + WRITE_ONCE(fbn->time_offset, READ_ONCE(fbn->time_offset) + delta); + u64_stats_update_end(&fbn->time_seq); + spin_unlock_irqrestore(&fbd->time_lock, flags); + + return 0; +} + +static int +fbnic_ptp_gettimex64(struct ptp_clock_info *ptp, struct timespec64 *ts, + struct ptp_system_timestamp *sts) +{ + struct fbnic_dev *fbd = fbnic_from_ptp_info(ptp); + struct fbnic_net *fbn; + unsigned long flags; + u64 time_ns; + u32 hi, lo; + + fbn = netdev_priv(fbd->netdev); + + spin_lock_irqsave(&fbd->time_lock, flags); + + do { + hi = fbnic_rd32(fbd, FBNIC_PTP_CTR_VAL_HI); + ptp_read_system_prets(sts); + lo = fbnic_rd32(fbd, FBNIC_PTP_CTR_VAL_LO); + ptp_read_system_postts(sts); + /* Similarly to comment above __fbnic_time_get_slow() + * - this can be optimized if needed. + */ + } while (hi != fbnic_rd32(fbd, FBNIC_PTP_CTR_VAL_HI)); + + time_ns = ((u64)hi << 32 | lo) + fbn->time_offset; + spin_unlock_irqrestore(&fbd->time_lock, flags); + + if (!fbnic_present(fbd)) + return -EIO; + + *ts = ns_to_timespec64(time_ns); + + return 0; +} + +static int +fbnic_ptp_settime64(struct ptp_clock_info *ptp, const struct timespec64 *ts) +{ + struct fbnic_dev *fbd = fbnic_from_ptp_info(ptp); + struct fbnic_net *fbn; + unsigned long flags; + u64 dev_ns, host_ns; + int ret; + + fbn = netdev_priv(fbd->netdev); + + host_ns = timespec64_to_ns(ts); + + spin_lock_irqsave(&fbd->time_lock, flags); + + dev_ns = __fbnic_time_get_slow(fbd); + + if (fbnic_present(fbd)) { + u64_stats_update_begin(&fbn->time_seq); + WRITE_ONCE(fbn->time_offset, host_ns - dev_ns); + u64_stats_update_end(&fbn->time_seq); + ret = 0; + } else { + ret = -EIO; + } + spin_unlock_irqrestore(&fbd->time_lock, flags); + + return ret; +} + +static const struct ptp_clock_info fbnic_ptp_info = { + .owner = THIS_MODULE, + /* 1,000,000,000 - 1 PPB to ensure increment is positive + * after max negative adjustment. + */ + .max_adj = 999999999, + .do_aux_work = fbnic_ptp_do_aux_work, + .adjfine = fbnic_ptp_adjfine, + .adjtime = fbnic_ptp_adjtime, + .gettimex64 = fbnic_ptp_gettimex64, + .settime64 = fbnic_ptp_settime64, +}; + +static void fbnic_ptp_reset(struct fbnic_dev *fbd) +{ + struct fbnic_net *fbn = netdev_priv(fbd->netdev); + u64 dclk_period; + + fbnic_wr32(fbd, FBNIC_PTP_CTRL, + FBNIC_PTP_CTRL_EN | + FIELD_PREP(FBNIC_PTP_CTRL_TICK_IVAL, 1)); + + /* d_clock is 600 MHz; which in Q16.32 fixed point ns is: */ + dclk_period = (((u64)1000000000) << 32) / FBNIC_CLOCK_FREQ; + + __fbnic_time_set_addend(fbd, dclk_period); + + fbnic_wr32(fbd, FBNIC_PTP_INIT_HI, 0); + fbnic_wr32(fbd, FBNIC_PTP_INIT_LO, 0); + + fbnic_wr32(fbd, FBNIC_PTP_ADJUST, FBNIC_PTP_ADJUST_INIT); + + fbnic_wr32(fbd, FBNIC_PTP_CTRL, + FBNIC_PTP_CTRL_EN | + FBNIC_PTP_CTRL_TQS_OUT_EN | + FIELD_PREP(FBNIC_PTP_CTRL_MAC_OUT_IVAL, 3) | + FIELD_PREP(FBNIC_PTP_CTRL_TICK_IVAL, 1)); + + fbnic_rd32(fbd, FBNIC_PTP_SPARE); + + fbn->time_offset = 0; + fbn->time_high = 0; +} + +void fbnic_time_init(struct fbnic_net *fbn) +{ + /* This is not really a statistic, but the lockng primitive fits + * our usecase perfectly, we need an atomic 8 bytes READ_ONCE() / + * WRITE_ONCE() behavior. + */ + u64_stats_init(&fbn->time_seq); +} + +int fbnic_time_start(struct fbnic_net *fbn) +{ + fbnic_ptp_refresh_time(fbn->fbd, fbn); + /* Assume that fbnic_ptp_do_aux_work() will never be called if not + * scheduled here + */ + return ptp_schedule_worker(fbn->fbd->ptp, FBNIC_TS_HIGH_REFRESH_JIF); +} + +void fbnic_time_stop(struct fbnic_net *fbn) +{ + ptp_cancel_worker_sync(fbn->fbd->ptp); + fbnic_ptp_fresh_check(fbn->fbd); +} + +int fbnic_ptp_setup(struct fbnic_dev *fbd) +{ + struct device *dev = fbd->dev; + unsigned long flags; + + spin_lock_init(&fbd->time_lock); + + spin_lock_irqsave(&fbd->time_lock, flags); /* Appease lockdep */ + fbnic_ptp_reset(fbd); + spin_unlock_irqrestore(&fbd->time_lock, flags); + + memcpy(&fbd->ptp_info, &fbnic_ptp_info, sizeof(fbnic_ptp_info)); + + fbd->ptp = ptp_clock_register(&fbd->ptp_info, dev); + if (IS_ERR(fbd->ptp)) + dev_err(dev, "Failed to register PTP: %pe\n", fbd->ptp); + + return PTR_ERR_OR_ZERO(fbd->ptp); +} + +void fbnic_ptp_destroy(struct fbnic_dev *fbd) +{ + if (!fbd->ptp) + return; + ptp_clock_unregister(fbd->ptp); +}