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, 32 insertions, 1 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice.h b/drivers/net/ethernet/intel/ice/ice.h
index d35eb6404524..22b8323ff0d0 100644
--- a/drivers/net/ethernet/intel/ice/ice.h
+++ b/drivers/net/ethernet/intel/ice/ice.h
@@ -84,7 +84,11 @@
 #define ICE_BAR0		0
 #define ICE_REQ_DESC_MULTIPLE	32
 #define ICE_MIN_NUM_DESC	64
-#define ICE_MAX_NUM_DESC	8160
+#define ICE_MAX_NUM_DESC_E810	8160
+#define ICE_MAX_NUM_DESC_E830	8096
+#define ICE_MAX_NUM_DESC_BY_MAC(hw) ((hw)->mac_type == ICE_MAC_E830 ? \
+				     ICE_MAX_NUM_DESC_E830 : \
+				     ICE_MAX_NUM_DESC_E810)
 #define ICE_DFLT_MIN_RX_DESC	512
 #define ICE_DFLT_NUM_TX_DESC	256
 #define ICE_DFLT_NUM_RX_DESC	2048
@@ -200,6 +204,7 @@ enum ice_feature {
 	ICE_F_SMA_CTRL,
 	ICE_F_CGU,
 	ICE_F_GNSS,
+	ICE_F_TXTIME,
 	ICE_F_GCS,
 	ICE_F_ROCE_LAG,
 	ICE_F_SRIOV_LAG,
@@ -575,6 +580,7 @@ struct ice_pf {
 	DECLARE_BITMAP(misc_thread, ICE_MISC_THREAD_NBITS);
 	unsigned long *avail_txqs;	/* bitmap to track PF Tx queue usage */
 	unsigned long *avail_rxqs;	/* bitmap to track PF Rx queue usage */
+	unsigned long *txtime_txqs;     /* bitmap to track PF Tx Time queue */
 	unsigned long serv_tmr_period;
 	unsigned long serv_tmr_prev;
 	struct timer_list serv_tmr;
@@ -749,6 +755,31 @@ static inline void ice_set_ring_xdp(struct ice_tx_ring *ring)
 }
 
 /**
+ * ice_is_txtime_ena - check if Tx Time is enabled on the Tx ring
+ * @ring: pointer to Tx ring
+ *
+ * Return: true if the Tx ring has Tx Time enabled, false otherwise.
+ */
+static inline bool ice_is_txtime_ena(const struct ice_tx_ring *ring)
+{
+	struct ice_vsi *vsi = ring->vsi;
+	struct ice_pf *pf = vsi->back;
+
+	return test_bit(ring->q_index,  pf->txtime_txqs);
+}
+
+/**
+ * ice_is_txtime_cfg - check if Tx Time is configured on the Tx ring
+ * @ring: pointer to Tx ring
+ *
+ * Return: true if the Tx ring is configured for Tx ring, false otherwise.
+ */
+static inline bool ice_is_txtime_cfg(const struct ice_tx_ring *ring)
+{
+	return !!(ring->flags & ICE_TX_FLAGS_TXTIME);
+}
+
+/**
  * ice_get_xp_from_qid - get ZC XSK buffer pool bound to a queue ID
  * @vsi: pointer to VSI
  * @qid: index of a queue to look at XSK buff pool presence