[PATCH] net/cnxk: support Tx queue descriptor count

[<skoteshwar@marvell.com>]

From: Satha Rao <skoteshwar@marvell.com>

Added cnxk APIs to get used txq descriptor count.

Signed-off-by: Satha Rao <skoteshwar@marvell.com>
---
 doc/guides/nics/features/cnxk.ini |  1 +
 drivers/net/cnxk/cn10k_ethdev.c   | 10 ++++++++++
 drivers/net/cnxk/cn9k_ethdev.c    | 10 ++++++++++
 drivers/net/cnxk/cnxk_ethdev.h    | 11 +++++++++++
 4 files changed, 32 insertions(+)

diff --git a/doc/guides/nics/features/cnxk.ini b/doc/guides/nics/features/cnxk.ini
index ac7de9a..5cc12ef 100644
--- a/doc/guides/nics/features/cnxk.ini
+++ b/doc/guides/nics/features/cnxk.ini
@@ -40,6 +40,7 @@ Timesync             = Y
 Timestamp offload    = Y
 Rx descriptor status = Y
 Tx descriptor status = Y
+Tx queue count       = Y
 Basic stats          = Y
 Stats per queue      = Y
 Extended stats       = Y
diff --git a/drivers/net/cnxk/cn10k_ethdev.c b/drivers/net/cnxk/cn10k_ethdev.c
index 4a4e972..3a3b8db 100644
--- a/drivers/net/cnxk/cn10k_ethdev.c
+++ b/drivers/net/cnxk/cn10k_ethdev.c
@@ -768,6 +768,14 @@
 	return rc;
 }
 
+static int
+cn10k_nix_tx_queue_count(void *tx_queue)
+{
+	struct cn10k_eth_txq *txq = (struct cn10k_eth_txq *)tx_queue;
+
+	return cnxk_nix_tx_queue_count(txq->fc_mem, txq->sqes_per_sqb_log2);
+}
+
 /* Update platform specific eth dev ops */
 static void
 nix_eth_dev_ops_override(void)
@@ -866,6 +874,8 @@
 		return -ENOENT;
 	}
 
+	eth_dev->tx_queue_count = cn10k_nix_tx_queue_count;
+
 	if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
 		/* Setup callbacks for secondary process */
 		cn10k_eth_set_tx_function(eth_dev);
diff --git a/drivers/net/cnxk/cn9k_ethdev.c b/drivers/net/cnxk/cn9k_ethdev.c
index bae4dda..b7c4f59 100644
--- a/drivers/net/cnxk/cn9k_ethdev.c
+++ b/drivers/net/cnxk/cn9k_ethdev.c
@@ -689,6 +689,14 @@
 		cn9k_nix_timesync_read_tx_timestamp;
 }
 
+static int
+cn9k_nix_tx_queue_count(void *tx_queue)
+{
+	struct cn9k_eth_txq *txq = (struct cn9k_eth_txq *)tx_queue;
+
+	return cnxk_nix_tx_queue_count(txq->fc_mem, txq->sqes_per_sqb_log2);
+}
+
 /* Update platform specific eth dev ops */
 static void
 nix_tm_ops_override(void)
@@ -759,6 +767,8 @@
 		return -ENOENT;
 	}
 
+	eth_dev->tx_queue_count = cn9k_nix_tx_queue_count;
+
 	if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
 		/* Setup callbacks for secondary process */
 		cn9k_eth_set_tx_function(eth_dev);
diff --git a/drivers/net/cnxk/cnxk_ethdev.h b/drivers/net/cnxk/cnxk_ethdev.h
index 4d3ebf1..0fe8b72 100644
--- a/drivers/net/cnxk/cnxk_ethdev.h
+++ b/drivers/net/cnxk/cnxk_ethdev.h
@@ -458,6 +458,17 @@ struct cnxk_eth_txq_sp {
 	return ((struct cnxk_eth_txq_sp *)__txq) - 1;
 }
 
+static inline int
+cnxk_nix_tx_queue_count(uint64_t *mem, uint16_t sqes_per_sqb_log2)
+{
+	uint64_t val;
+
+	val = rte_atomic_load_explicit(mem, rte_memory_order_relaxed);
+	val = (val << sqes_per_sqb_log2) - val;
+
+	return (val & 0xFFFF);
+}
+
 /* Common ethdev ops */
 extern struct eth_dev_ops cnxk_eth_dev_ops;
 
-- 
1.8.3.1