Commit c470195b authored by Pavan Chebbi's avatar Pavan Chebbi Committed by Jakub Kicinski
Browse files

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



.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: default avatarSomnath Kotur <somnath.kotur@broadcom.com>
Reviewed-by: default avatarVadim Fedorenko <vadim.fedorenko@linux.dev>
Signed-off-by: default avatarPavan Chebbi <pavan.chebbi@broadcom.com>
Signed-off-by: default avatarMichael Chan <michael.chan@broadcom.com>
Link: https://patch.msgid.link/20260108183521.215610-3-michael.chan@broadcom.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent fdb573d6

drivers/net/ethernet/broadcom/bnxt/bnxt.c

+2 −0
Original line number Diff line number Diff line
@@ -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))

drivers/net/ethernet/broadcom/bnxt/bnxt.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

drivers/net/ethernet/broadcom/bnxt/bnxt_ptp.c

+47 −0
Original line number Diff line number Diff line
@@ -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);