ice: add E830 Earliest TxTime First Offload support

E830 supports Earliest TxTime First (ETF) hardware offload, which is
configured via the ETF Qdisc on a per-queue basis (see tc-etf(8)). ETF
introduces a new Tx flow mechanism that utilizes a timestamp ring
(tstamp_ring) alongside the standard Tx ring. This timestamp ring is
used to indicate when hardware will transmit a packet. Tx Time is
supported on the first 2048 Tx queues of the device, and the NVM image
limits the maximum number of Tx queues to 2048 for the device.

The allocation and initialization of the timestamp ring occur when the
feature is enabled on a specific Tx queue via tc-etf. The requested Tx
Time queue index cannot be greater than the number of Tx queues
(vsi->num_txq).

To support ETF, the following flags and bitmap are introduced:

 - ICE_F_TXTIME: Device feature flag set for E830 NICs, indicating ETF
   support.
 - txtime_txqs: PF-level bitmap set when ETF is enabled and cleared
   when disabled for a specific Tx queue. It is used by
   ice_is_txtime_ena() to check if ETF is allocated and configured on
   any Tx queue, which is checked during Tx ring allocation.
 - ICE_TX_FLAGS_TXTIME: Per Tx ring flag set when ETF is allocated and
   configured for a specific Tx queue. It determines ETF status during
   packet transmission and is checked by ice_is_txtime_ena() to verify
   if ETF is enabled on any Tx queue.

Due to a hardware issue that can result in a malicious driver detection
event, additional timestamp descriptors are required when wrapping
around the timestamp ring. Up to 64 additional timestamp descriptors
are reserved, reducing the available Tx descriptors.

To accommodate this, ICE_MAX_NUM_DESC_BY_MAC is introduced, defining:

 - E830: Maximum Tx descriptor count of 8096 (8K - 32 - 64 for timestamp
   fetch descriptors).
 - E810 and E82X: Maximum Tx descriptor count of 8160 (8K - 32).

Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Co-developed-by: Alice Michael <alice.michael@intel.com>
Signed-off-by: Alice Michael <alice.michael@intel.com>
Signed-off-by: Paul Greenwalt <paul.greenwalt@intel.com>
Acked-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com>
Tested-by: Rinitha S <sx.rinitha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

1 files changed, 208 insertions, 37 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_base.c b/drivers/net/ethernet/intel/ice/ice_base.c
index dc4beac04086..2d35a278c555 100644
--- a/drivers/net/ethernet/intel/ice/ice_base.c
+++ b/drivers/net/ethernet/intel/ice/ice_base.c
@@ -242,7 +242,8 @@ static void ice_cfg_itr_gran(struct ice_hw *hw)
  * @ring: ring to get the absolute queue index
  * @tc: traffic class number
  */
-static u16 ice_calc_txq_handle(struct ice_vsi *vsi, struct ice_tx_ring *ring, u8 tc)
+static u16
+ice_calc_txq_handle(const struct ice_vsi *vsi, struct ice_tx_ring *ring, u8 tc)
 {
 	WARN_ONCE(ice_ring_is_xdp(ring) && tc, "XDP ring can't belong to TC other than 0\n");
 
@@ -278,30 +279,20 @@ static void ice_cfg_xps_tx_ring(struct ice_tx_ring *ring)
 }
 
 /**
- * ice_setup_tx_ctx - setup a struct ice_tlan_ctx instance
- * @ring: The Tx ring to configure
- * @tlan_ctx: Pointer to the Tx LAN queue context structure to be initialized
- * @pf_q: queue index in the PF space
+ * ice_set_txq_ctx_vmvf - set queue context VM/VF type and number by VSI type
+ * @ring: the Tx ring to configure
+ * @vmvf_type: VM/VF type
+ * @vmvf_num: VM/VF number
  *
- * Configure the Tx descriptor ring in TLAN context.
+ * Return: 0 on success and a negative value on error.
  */
-static void
-ice_setup_tx_ctx(struct ice_tx_ring *ring, struct ice_tlan_ctx *tlan_ctx, u16 pf_q)
+static int
+ice_set_txq_ctx_vmvf(struct ice_tx_ring *ring, u8 *vmvf_type, u16 *vmvf_num)
 {
 	struct ice_vsi *vsi = ring->vsi;
-	struct ice_hw *hw = &vsi->back->hw;
-
-	tlan_ctx->base = ring->dma >> ICE_TLAN_CTX_BASE_S;
-
-	tlan_ctx->port_num = vsi->port_info->lport;
-
-	/* Transmit Queue Length */
-	tlan_ctx->qlen = ring->count;
-
-	ice_set_cgd_num(tlan_ctx, ring->dcb_tc);
+	struct ice_hw *hw;
 
-	/* PF number */
-	tlan_ctx->pf_num = hw->pf_id;
+	hw = &vsi->back->hw;
 
 	/* queue belongs to a specific VSI type
 	 * VF / VM index should be programmed per vmvf_type setting:
@@ -314,21 +305,60 @@ ice_setup_tx_ctx(struct ice_tx_ring *ring, struct ice_tlan_ctx *tlan_ctx, u16 pf
 	case ICE_VSI_CTRL:
 	case ICE_VSI_PF:
 		if (ring->ch)
-			tlan_ctx->vmvf_type = ICE_TLAN_CTX_VMVF_TYPE_VMQ;
+			*vmvf_type = ICE_TLAN_CTX_VMVF_TYPE_VMQ;
 		else
-			tlan_ctx->vmvf_type = ICE_TLAN_CTX_VMVF_TYPE_PF;
+			*vmvf_type = ICE_TLAN_CTX_VMVF_TYPE_PF;
 		break;
 	case ICE_VSI_VF:
 		/* Firmware expects vmvf_num to be absolute VF ID */
-		tlan_ctx->vmvf_num = hw->func_caps.vf_base_id + vsi->vf->vf_id;
-		tlan_ctx->vmvf_type = ICE_TLAN_CTX_VMVF_TYPE_VF;
+		*vmvf_num = hw->func_caps.vf_base_id + vsi->vf->vf_id;
+		*vmvf_type = ICE_TLAN_CTX_VMVF_TYPE_VF;
 		break;
 	case ICE_VSI_SF:
-		tlan_ctx->vmvf_type = ICE_TLAN_CTX_VMVF_TYPE_VMQ;
+		*vmvf_type = ICE_TLAN_CTX_VMVF_TYPE_VMQ;
 		break;
 	default:
-		return;
+		dev_info(ice_pf_to_dev(vsi->back),
+			 "Unable to set VMVF type for VSI type %d\n",
+			 vsi->type);
+		return -EINVAL;
 	}
+	return 0;
+}
+
+/**
+ * ice_setup_tx_ctx - setup a struct ice_tlan_ctx instance
+ * @ring: the Tx ring to configure
+ * @tlan_ctx: pointer to the Tx LAN queue context structure to be initialized
+ * @pf_q: queue index in the PF space
+ *
+ * Configure the Tx descriptor ring in TLAN context.
+ *
+ * Return: 0 on success and a negative value on error.
+ */
+static int
+ice_setup_tx_ctx(struct ice_tx_ring *ring, struct ice_tlan_ctx *tlan_ctx, u16 pf_q)
+{
+	struct ice_vsi *vsi = ring->vsi;
+	struct ice_hw *hw;
+	int err;
+
+	hw = &vsi->back->hw;
+	tlan_ctx->base = ring->dma >> ICE_TLAN_CTX_BASE_S;
+	tlan_ctx->port_num = vsi->port_info->lport;
+
+	/* Transmit Queue Length */
+	tlan_ctx->qlen = ring->count;
+
+	ice_set_cgd_num(tlan_ctx, ring->dcb_tc);
+
+	/* PF number */
+	tlan_ctx->pf_num = hw->pf_id;
+
+	err = ice_set_txq_ctx_vmvf(ring, &tlan_ctx->vmvf_type,
+				   &tlan_ctx->vmvf_num);
+	if (err)
+		return err;
 
 	/* make sure the context is associated with the right VSI */
 	if (ring->ch)
@@ -355,6 +385,80 @@ ice_setup_tx_ctx(struct ice_tx_ring *ring, struct ice_tlan_ctx *tlan_ctx, u16 pf
 	 * 1: Legacy Host Interface
 	 */
 	tlan_ctx->legacy_int = ICE_TX_LEGACY;
+
+	return 0;
+}
+
+/**
+ * ice_setup_txtime_ctx - setup a struct ice_txtime_ctx instance
+ * @ring: the tstamp ring to configure
+ * @txtime_ctx: pointer to the Tx time queue context structure to be initialized
+ *
+ * Return: 0 on success and a negative value on error.
+ */
+static int
+ice_setup_txtime_ctx(const struct ice_tstamp_ring *ring,
+		     struct ice_txtime_ctx *txtime_ctx)
+{
+	struct ice_tx_ring *tx_ring = ring->tx_ring;
+	struct ice_vsi *vsi = tx_ring->vsi;
+	struct ice_hw *hw = &vsi->back->hw;
+	int err;
+
+	txtime_ctx->base = ring->dma >> ICE_TXTIME_CTX_BASE_S;
+
+	/* Tx time Queue Length */
+	txtime_ctx->qlen = ring->count;
+	txtime_ctx->txtime_ena_q = 1;
+
+	/* PF number */
+	txtime_ctx->pf_num = hw->pf_id;
+
+	err = ice_set_txq_ctx_vmvf(tx_ring, &txtime_ctx->vmvf_type,
+				   &txtime_ctx->vmvf_num);
+	if (err)
+		return err;
+
+	/* make sure the context is associated with the right VSI */
+	if (tx_ring->ch)
+		txtime_ctx->src_vsi = tx_ring->ch->vsi_num;
+	else
+		txtime_ctx->src_vsi = ice_get_hw_vsi_num(hw, vsi->idx);
+
+	txtime_ctx->ts_res = ICE_TXTIME_CTX_RESOLUTION_128NS;
+	txtime_ctx->drbell_mode_32 = ICE_TXTIME_CTX_DRBELL_MODE_32;
+	txtime_ctx->ts_fetch_prof_id = ICE_TXTIME_CTX_FETCH_PROF_ID_0;
+
+	return 0;
+}
+
+/**
+ * ice_calc_ts_ring_count - calculate the number of Tx time stamp descriptors
+ * @tx_ring: Tx ring to calculate the count for
+ *
+ * Return: the number of Tx time stamp descriptors.
+ */
+u16 ice_calc_ts_ring_count(struct ice_tx_ring *tx_ring)
+{
+	u16 prof = ICE_TXTIME_CTX_FETCH_PROF_ID_0;
+	struct ice_vsi *vsi = tx_ring->vsi;
+	struct ice_hw *hw = &vsi->back->hw;
+	u16 max_fetch_desc = 0, fetch, i;
+	u32 reg;
+
+	for (i = 0; i < ICE_TXTIME_FETCH_PROFILE_CNT; i++) {
+		reg = rd32(hw, E830_GLTXTIME_FETCH_PROFILE(prof, 0));
+		fetch = FIELD_GET(E830_GLTXTIME_FETCH_PROFILE_FETCH_TS_DESC_M,
+				  reg);
+		max_fetch_desc = max(fetch, max_fetch_desc);
+	}
+
+	if (!max_fetch_desc)
+		max_fetch_desc = ICE_TXTIME_FETCH_TS_DESC_DFLT;
+
+	max_fetch_desc = ALIGN(max_fetch_desc, ICE_REQ_DESC_MULTIPLE);
+
+	return tx_ring->count + max_fetch_desc;
 }
 
 /**
@@ -882,13 +986,49 @@ void ice_vsi_free_q_vectors(struct ice_vsi *vsi)
 }
 
 /**
+ * ice_cfg_tstamp - Configure Tx time stamp queue
+ * @tx_ring: Tx ring to be configured with timestamping
+ *
+ * Return: 0 on success and a negative value on error.
+ */
+static int
+ice_cfg_tstamp(struct ice_tx_ring *tx_ring)
+{
+	DEFINE_RAW_FLEX(struct ice_aqc_set_txtime_qgrp, txtime_qg_buf,
+			txtimeqs, 1);
+	u8 txtime_buf_len = struct_size(txtime_qg_buf, txtimeqs, 1);
+	struct ice_tstamp_ring *tstamp_ring = tx_ring->tstamp_ring;
+	struct ice_txtime_ctx txtime_ctx = {};
+	struct ice_vsi *vsi = tx_ring->vsi;
+	struct ice_pf *pf = vsi->back;
+	struct ice_hw *hw = &pf->hw;
+	u16 pf_q = tx_ring->reg_idx;
+	int err;
+
+	err = ice_setup_txtime_ctx(tstamp_ring, &txtime_ctx);
+	if (err) {
+		dev_err(ice_pf_to_dev(pf), "Failed to setup Tx time queue context for queue %d, error: %d\n",
+			pf_q, err);
+		return err;
+	}
+	ice_pack_txtime_ctx(&txtime_ctx,
+			    &txtime_qg_buf->txtimeqs[0].txtime_ctx);
+
+	tstamp_ring->tail = hw->hw_addr + E830_GLQTX_TXTIME_DBELL_LSB(pf_q);
+	return ice_aq_set_txtimeq(hw, pf_q, 1, txtime_qg_buf,
+				  txtime_buf_len, NULL);
+}
+
+/**
  * ice_vsi_cfg_txq - Configure single Tx queue
  * @vsi: the VSI that queue belongs to
  * @ring: Tx ring to be configured
  * @qg_buf: queue group buffer
+ *
+ * Return: 0 on success and a negative value on error.
  */
 static int
-ice_vsi_cfg_txq(struct ice_vsi *vsi, struct ice_tx_ring *ring,
+ice_vsi_cfg_txq(const struct ice_vsi *vsi, struct ice_tx_ring *ring,
 		struct ice_aqc_add_tx_qgrp *qg_buf)
 {
 	u8 buf_len = struct_size(qg_buf, txqs, 1);
@@ -897,15 +1037,20 @@ ice_vsi_cfg_txq(struct ice_vsi *vsi, struct ice_tx_ring *ring,
 	struct ice_channel *ch = ring->ch;
 	struct ice_pf *pf = vsi->back;
 	struct ice_hw *hw = &pf->hw;
+	u32 pf_q, vsi_idx;
 	int status;
-	u16 pf_q;
 	u8 tc;
 
 	/* Configure XPS */
 	ice_cfg_xps_tx_ring(ring);
 
 	pf_q = ring->reg_idx;
-	ice_setup_tx_ctx(ring, &tlan_ctx, pf_q);
+	status = ice_setup_tx_ctx(ring, &tlan_ctx, pf_q);
+	if (status) {
+		dev_err(ice_pf_to_dev(pf), "Failed to setup Tx context for queue %d, error: %d\n",
+			pf_q, status);
+		return status;
+	}
 	/* copy context contents into the qg_buf */
 	qg_buf->txqs[0].txq_id = cpu_to_le16(pf_q);
 	ice_pack_txq_ctx(&tlan_ctx, &qg_buf->txqs[0].txq_ctx);
@@ -925,14 +1070,15 @@ ice_vsi_cfg_txq(struct ice_vsi *vsi, struct ice_tx_ring *ring,
 	 */
 	ring->q_handle = ice_calc_txq_handle(vsi, ring, tc);
 
-	if (ch)
-		status = ice_ena_vsi_txq(vsi->port_info, ch->ch_vsi->idx, 0,
-					 ring->q_handle, 1, qg_buf, buf_len,
-					 NULL);
-	else
-		status = ice_ena_vsi_txq(vsi->port_info, vsi->idx, tc,
-					 ring->q_handle, 1, qg_buf, buf_len,
-					 NULL);
+	if (ch) {
+		tc = 0;
+		vsi_idx = ch->ch_vsi->idx;
+	} else {
+		vsi_idx = vsi->idx;
+	}
+
+	status = ice_ena_vsi_txq(vsi->port_info, vsi_idx, tc, ring->q_handle,
+				 1, qg_buf, buf_len, NULL);
 	if (status) {
 		dev_err(ice_pf_to_dev(pf), "Failed to set LAN Tx queue context, error: %d\n",
 			status);
@@ -947,7 +1093,32 @@ ice_vsi_cfg_txq(struct ice_vsi *vsi, struct ice_tx_ring *ring,
 	if (pf_q == le16_to_cpu(txq->txq_id))
 		ring->txq_teid = le32_to_cpu(txq->q_teid);
 
+	if (ice_is_txtime_ena(ring)) {
+		status = ice_alloc_setup_tstamp_ring(ring);
+		if (status) {
+			dev_err(ice_pf_to_dev(pf),
+				"Failed to allocate Tx timestamp ring, error: %d\n",
+				status);
+			goto err_setup_tstamp;
+		}
+
+		status = ice_cfg_tstamp(ring);
+		if (status) {
+			dev_err(ice_pf_to_dev(pf), "Failed to set Tx Time queue context, error: %d\n",
+				status);
+			goto err_cfg_tstamp;
+		}
+	}
 	return 0;
+
+err_cfg_tstamp:
+	ice_free_tx_tstamp_ring(ring);
+err_setup_tstamp:
+	ice_dis_vsi_txq(vsi->port_info, vsi_idx, tc, 1, &ring->q_handle,
+			&ring->reg_idx, &ring->txq_teid, ICE_NO_RESET,
+			tlan_ctx.vmvf_num, NULL);
+
+	return status;
 }
 
 int ice_vsi_cfg_single_txq(struct ice_vsi *vsi, struct ice_tx_ring **tx_rings,