ice: support Rx timestamp on flex descriptor

To support Rx timestamp offload, VIRTCHNL_OP_1588_PTP_CAPS is sent by
the VF to request PTP capability and responded by the PF what capability
is enabled for that VF.

Hardware captures timestamps which contain only 32 bits of nominal
nanoseconds, as opposed to the 64bit timestamps that the stack expects.
To convert 32b to 64b, we need a current PHC time.
VIRTCHNL_OP_1588_PTP_GET_TIME is sent by the VF and responded by the
PF with the current PHC time.

Signed-off-by: Simei Su <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Tested-by: Rafal Romanowski <[email protected]>
Co-developed-by: Mateusz Polchlopek <[email protected]>
Signed-off-by: Mateusz Polchlopek <[email protected]>
Signed-off-by: Tony Nguyen <[email protected]>

1 files changed, 74 insertions, 2 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_virtchnl.c b/drivers/net/ethernet/intel/ice/ice_virtchnl.c
index ff4ad788d96a..629f04d1c3ff 100644
--- a/drivers/net/ethernet/intel/ice/ice_virtchnl.c
+++ b/drivers/net/ethernet/intel/ice/ice_virtchnl.c
@@ -498,6 +498,9 @@ static int ice_vc_get_vf_res_msg(struct ice_vf *vf, u8 *msg)
 	if (vf->driver_caps & VIRTCHNL_VF_OFFLOAD_QOS)
 		vfres->vf_cap_flags |= VIRTCHNL_VF_OFFLOAD_QOS;
 
+	if (vf->driver_caps & VIRTCHNL_VF_CAP_PTP)
+		vfres->vf_cap_flags |= VIRTCHNL_VF_CAP_PTP;
+
 	vfres->num_vsis = 1;
 	/* Tx and Rx queue are equal for VF */
 	vfres->num_queue_pairs = vsi->num_txq;
@@ -1975,6 +1978,7 @@ static int ice_vc_cfg_qs_msg(struct ice_vf *vf, u8 *msg)
 	struct ice_vsi *vsi;
 	u8 act_prt, pri_prt;
 	int i = -1, q_idx;
+	bool ena_ts;
 
 	lag = pf->lag;
 	mutex_lock(&pf->lag_mutex);
@@ -2104,9 +2108,14 @@ static int ice_vc_cfg_qs_msg(struct ice_vf *vf, u8 *msg)
 				rxdid = ICE_RXDID_LEGACY_1;
 			}
 
+			ena_ts = ((vf->driver_caps &
+				  VIRTCHNL_VF_OFFLOAD_RX_FLEX_DESC) &&
+				  (vf->driver_caps & VIRTCHNL_VF_CAP_PTP) &&
+				  (qpi->rxq.flags & VIRTCHNL_PTP_RX_TSTAMP));
+
 			ice_write_qrxflxp_cntxt(&vsi->back->hw,
-						vsi->rxq_map[q_idx],
-						rxdid, 0x03, false);
+						vsi->rxq_map[q_idx], rxdid,
+						ICE_RXDID_PRIO, ena_ts);
 		}
 	}
 
@@ -4092,6 +4101,59 @@ out:
 				     v_ret, NULL, 0);
 }
 
+static int ice_vc_get_ptp_cap(struct ice_vf *vf,
+			      const struct virtchnl_ptp_caps *msg)
+{
+	enum virtchnl_status_code v_ret = VIRTCHNL_STATUS_ERR_PARAM;
+	u32 caps = VIRTCHNL_1588_PTP_CAP_RX_TSTAMP |
+		   VIRTCHNL_1588_PTP_CAP_READ_PHC;
+
+	if (!test_bit(ICE_VF_STATE_ACTIVE, vf->vf_states))
+		goto err;
+
+	v_ret = VIRTCHNL_STATUS_SUCCESS;
+
+	if (msg->caps & caps)
+		vf->ptp_caps = caps;
+
+err:
+	/* send the response back to the VF */
+	return ice_vc_send_msg_to_vf(vf, VIRTCHNL_OP_1588_PTP_GET_CAPS, v_ret,
+				     (u8 *)&vf->ptp_caps,
+				     sizeof(struct virtchnl_ptp_caps));
+}
+
+static int ice_vc_get_phc_time(struct ice_vf *vf)
+{
+	enum virtchnl_status_code v_ret = VIRTCHNL_STATUS_ERR_PARAM;
+	struct virtchnl_phc_time *phc_time = NULL;
+	struct ice_pf *pf = vf->pf;
+	u32 len = 0;
+	int ret;
+
+	if (!test_bit(ICE_VF_STATE_ACTIVE, vf->vf_states))
+		goto err;
+
+	v_ret = VIRTCHNL_STATUS_SUCCESS;
+
+	phc_time = kzalloc(sizeof(*phc_time), GFP_KERNEL);
+	if (!phc_time) {
+		v_ret = VIRTCHNL_STATUS_ERR_NO_MEMORY;
+		goto err;
+	}
+
+	len = sizeof(*phc_time);
+
+	phc_time->time = ice_ptp_read_src_clk_reg(pf, NULL);
+
+err:
+	/* send the response back to the VF */
+	ret = ice_vc_send_msg_to_vf(vf, VIRTCHNL_OP_1588_PTP_GET_TIME, v_ret,
+				    (u8 *)phc_time, len);
+	kfree(phc_time);
+	return ret;
+}
+
 static const struct ice_virtchnl_ops ice_virtchnl_dflt_ops = {
 	.get_ver_msg = ice_vc_get_ver_msg,
 	.get_vf_res_msg = ice_vc_get_vf_res_msg,
@@ -4128,6 +4190,8 @@ static const struct ice_virtchnl_ops ice_virtchnl_dflt_ops = {
 	.get_qos_caps = ice_vc_get_qos_caps,
 	.cfg_q_bw = ice_vc_cfg_q_bw,
 	.cfg_q_quanta = ice_vc_cfg_q_quanta,
+	.get_ptp_cap = ice_vc_get_ptp_cap,
+	.get_phc_time = ice_vc_get_phc_time,
 	/* If you add a new op here please make sure to add it to
 	 * ice_virtchnl_repr_ops as well.
 	 */
@@ -4264,6 +4328,8 @@ static const struct ice_virtchnl_ops ice_virtchnl_repr_ops = {
 	.get_qos_caps = ice_vc_get_qos_caps,
 	.cfg_q_bw = ice_vc_cfg_q_bw,
 	.cfg_q_quanta = ice_vc_cfg_q_quanta,
+	.get_ptp_cap = ice_vc_get_ptp_cap,
+	.get_phc_time = ice_vc_get_phc_time,
 };
 
 /**
@@ -4501,6 +4567,12 @@ error_handler:
 	case VIRTCHNL_OP_CONFIG_QUANTA:
 		err = ops->cfg_q_quanta(vf, msg);
 		break;
+	case VIRTCHNL_OP_1588_PTP_GET_CAPS:
+		err = ops->get_ptp_cap(vf, (const void *)msg);
+		break;
+	case VIRTCHNL_OP_1588_PTP_GET_TIME:
+		err = ops->get_phc_time(vf);
+		break;
 	case VIRTCHNL_OP_UNKNOWN:
 	default:
 		dev_err(dev, "Unsupported opcode %d from VF %d\n", v_opcode,