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bnxt_en: Add PTP .getcrosststamp() interface to get device/host times

Browse Source 
.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 <somnath.kotur@broadcom.com>
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Signed-off-by: Pavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: Michael Chan <michael.chan@broadcom.com>
Link: https://patch.msgid.link/20260108183521.215610-3-michael.chan@broadcom.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Pavan Chebbi 2026-01-08 10:35:17 -08:00 committed by Jakub Kicinski
parent fdb573d675
commit c470195b98
3 changed files with 50 additions and 0 deletions
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2
drivers/net/ethernet/broadcom/bnxt/bnxt.c
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@ -9700,6 +9700,8 @@ 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))

1
drivers/net/ethernet/broadcom/bnxt/bnxt.h
View File

@ -2516,6 +2516,7 @@ 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;

47
drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c
View File

@ -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);