[PATCH net-next 2/6] bnxt_en: Add PTP .getcrosststamp() interface to get device/host times
From: Michael Chan <michael.chan@broadcom.com>
Date: 2026-01-05 21:59:13
Subsystem:
broadcom bnxt_en 50 gigabit ethernet driver, networking drivers, the rest · Maintainers:
Michael Chan, Pavan Chebbi, Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
From: Pavan Chebbi <pavan.chebbi@broadcom.com> .getcrosststamp() helps the applications to obtain a snapshot of device and host time almost taken at the same time. This function will report PCIe PTM device and host times to any application using the ioctl PTP_SYS_OFFSET_PRECISE. The device time from the HW is 48-bit and needs to be converted to 64-bit. Reviewed-by: Somnath Kotur <redacted> Signed-off-by: Pavan Chebbi <pavan.chebbi@broadcom.com> Signed-off-by: Michael Chan <michael.chan@broadcom.com> --- Cc: Vadim Fedorenko <vadim.fedorenko@linux.dev> v2: Add check for x86 support v1: https://lore.kernel.org/netdev/20251126215648.1885936-8-michael.chan@broadcom.com/ (local) --- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 2 + drivers/net/ethernet/broadcom/bnxt/bnxt.h | 1 + drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c | 47 +++++++++++++++++++ 3 files changed, 50 insertions(+)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index d17d0ea89c36..9ab9ebd57367 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c@@ -9691,6 +9691,8 @@ static int __bnxt_hwrm_func_qcaps(struct bnxt *bp) bp->fw_cap |= BNXT_FW_CAP_EXT_HW_STATS_SUPPORTED; if (BNXT_PF(bp) && (flags_ext & FUNC_QCAPS_RESP_FLAGS_EXT_PTP_PPS_SUPPORTED)) bp->fw_cap |= BNXT_FW_CAP_PTP_PPS; + if (flags_ext & FUNC_QCAPS_RESP_FLAGS_EXT_PTP_PTM_SUPPORTED) + bp->fw_cap |= BNXT_FW_CAP_PTP_PTM; if (flags_ext & FUNC_QCAPS_RESP_FLAGS_EXT_PTP_64BIT_RTC_SUPPORTED) bp->fw_cap |= BNXT_FW_CAP_PTP_RTC; if (BNXT_PF(bp) && (flags_ext & FUNC_QCAPS_RESP_FLAGS_EXT_HOT_RESET_IF_SUPPORT))
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index f5f07a7e6b29..08d9adf52ec6 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h@@ -2518,6 +2518,7 @@ struct bnxt { #define BNXT_FW_CAP_SW_MAX_RESOURCE_LIMITS BIT_ULL(41) #define BNXT_FW_CAP_NPAR_1_2 BIT_ULL(42) #define BNXT_FW_CAP_MIRROR_ON_ROCE BIT_ULL(43) + #define BNXT_FW_CAP_PTP_PTM BIT_ULL(44) u32 fw_dbg_cap;
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
index a8a74f07bb54..75ad385f5f79 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c@@ -882,6 +882,49 @@ void bnxt_tx_ts_cmp(struct bnxt *bp, struct bnxt_napi *bnapi, } } +static int bnxt_phc_get_syncdevicetime(ktime_t *device, + struct system_counterval_t *system, + void *ctx) +{ + struct bnxt_ptp_cfg *ptp = (struct bnxt_ptp_cfg *)ctx; + struct hwrm_func_ptp_ts_query_output *resp; + struct hwrm_func_ptp_ts_query_input *req; + struct bnxt *bp = ptp->bp; + u64 ptm_local_ts; + int rc; + + rc = hwrm_req_init(bp, req, HWRM_FUNC_PTP_TS_QUERY); + if (rc) + return rc; + req->flags = cpu_to_le32(FUNC_PTP_TS_QUERY_REQ_FLAGS_PTM_TIME); + resp = hwrm_req_hold(bp, req); + rc = hwrm_req_send(bp, req); + if (rc) { + hwrm_req_drop(bp, req); + return rc; + } + ptm_local_ts = le64_to_cpu(resp->ptm_local_ts); + *device = ns_to_ktime(bnxt_timecounter_cyc2time(ptp, ptm_local_ts)); + /* ptm_system_ts is 64-bit */ + system->cycles = le64_to_cpu(resp->ptm_system_ts); + system->cs_id = CSID_X86_ART; + system->use_nsecs = true; + + hwrm_req_drop(bp, req); + + return 0; +} + +static int bnxt_ptp_getcrosststamp(struct ptp_clock_info *ptp_info, + struct system_device_crosststamp *xtstamp) +{ + struct bnxt_ptp_cfg *ptp = container_of(ptp_info, struct bnxt_ptp_cfg, + ptp_info); + + return get_device_system_crosststamp(bnxt_phc_get_syncdevicetime, + ptp, NULL, xtstamp); +} + static const struct ptp_clock_info bnxt_ptp_caps = { .owner = THIS_MODULE, .name = "bnxt clock",
@@ -1094,6 +1137,10 @@ int bnxt_ptp_init(struct bnxt *bp) if (bnxt_ptp_pps_init(bp)) netdev_err(bp->dev, "1pps not initialized, continuing without 1pps support\n"); } + if ((bp->fw_cap & BNXT_FW_CAP_PTP_PTM) && pcie_ptm_enabled(bp->pdev) && + boot_cpu_has(X86_FEATURE_ART)) + ptp->ptp_info.getcrosststamp = bnxt_ptp_getcrosststamp; + ptp->ptp_clock = ptp_clock_register(&ptp->ptp_info, &bp->pdev->dev); if (IS_ERR(ptp->ptp_clock)) { int err = PTR_ERR(ptp->ptp_clock);
--
2.51.0