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, 41 insertions, 0 deletions

diff --git a/drivers/net/ethernet/intel/ice/ice_lan_tx_rx.h b/drivers/net/ethernet/intel/ice/ice_lan_tx_rx.h
index 77ba26538b07..10c312d49e05 100644
--- a/drivers/net/ethernet/intel/ice/ice_lan_tx_rx.h
+++ b/drivers/net/ethernet/intel/ice/ice_lan_tx_rx.h
@@ -569,4 +569,45 @@ struct ice_tlan_ctx {
 	u8 pkt_shaper_prof_idx;
 };
 
+#define ICE_TXTIME_TX_DESC_IDX_M	GENMASK(12, 0)
+#define ICE_TXTIME_STAMP_M		GENMASK(31, 13)
+
+/* Tx time stamp descriptor */
+struct ice_ts_desc {
+	__le32 tx_desc_idx_tstamp;
+};
+
+#define ICE_TS_DESC(R, i) (&(((struct ice_ts_desc *)((R)->desc))[i]))
+
+#define ICE_TXTIME_MAX_QUEUE		2047
+#define ICE_SET_TXTIME_MAX_Q_AMOUNT	127
+#define ICE_TXTIME_FETCH_TS_DESC_DFLT	8
+#define ICE_TXTIME_FETCH_PROFILE_CNT	16
+
+/* Tx Time queue context data */
+struct ice_txtime_ctx {
+#define ICE_TXTIME_CTX_BASE_S		7
+	u64 base;			/* base is defined in 128-byte units */
+	u8 pf_num;
+	u16 vmvf_num;
+	u8 vmvf_type;
+	u16 src_vsi;
+	u8 cpuid;
+	u8 tphrd_desc;
+	u16 qlen;
+	u8 timer_num;
+	u8 txtime_ena_q;
+	u8 drbell_mode_32;
+#define ICE_TXTIME_CTX_DRBELL_MODE_32	1
+	u8 ts_res;
+#define ICE_TXTIME_CTX_RESOLUTION_128NS 7
+	u8 ts_round_type;
+	u8 ts_pacing_slot;
+#define ICE_TXTIME_CTX_FETCH_PROF_ID_0 0
+	u8 merging_ena;
+	u8 ts_fetch_prof_id;
+	u8 ts_fetch_cache_line_aln_thld;
+	u8 tx_pipe_delay_mode;
+};
+
 #endif /* _ICE_LAN_TX_RX_H_ */