[PATCH v2] event/cnxk: wait for CPT flow control on WQE path

[Rahul Bhansali]

This is to avoid CPT queue overflow and thereby a CPT misc
interrupt.

Fixes: 1a7da795f64 ("net/cnxk: support Tx security offload on cn9k")

Signed-off-by: Rahul Bhansali <rbhansali at marvell.com>
---
Changes in v2: Updated commit message.

 drivers/event/cnxk/cn9k_worker.h |  1 +
 drivers/net/cnxk/cn9k_tx.h       | 10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/drivers/event/cnxk/cn9k_worker.h b/drivers/event/cnxk/cn9k_worker.h
index 54213db3b4..1ce4b044e8 100644
--- a/drivers/event/cnxk/cn9k_worker.h
+++ b/drivers/event/cnxk/cn9k_worker.h
@@ -730,6 +730,7 @@ cn9k_sso_hws_xmit_sec_one(const struct cn9k_eth_txq *txq, uint64_t base,

 	rte_io_wmb();
 	cn9k_sso_txq_fc_wait(txq);
+	cn9k_nix_sec_fc_wait_one(txq);

 	/* Write CPT instruction to lmt line */
 	vst1q_u64(lmt_addr, cmd01);
diff --git a/drivers/net/cnxk/cn9k_tx.h b/drivers/net/cnxk/cn9k_tx.h
index 17bbdce3a0..b4ef45d65c 100644
--- a/drivers/net/cnxk/cn9k_tx.h
+++ b/drivers/net/cnxk/cn9k_tx.h
@@ -411,6 +411,16 @@ cn9k_nix_xmit_prep_lmt(uint64_t *cmd, void *lmt_addr, const uint32_t flags)
 	roc_lmt_mov(lmt_addr, cmd, cn9k_nix_tx_ext_subs(flags));
 }

+static __rte_always_inline void
+cn9k_nix_sec_fc_wait_one(const struct cn9k_eth_txq *txq)
+{
+	uint64_t nb_desc = txq->cpt_desc;
+	uint64_t *fc = txq->cpt_fc;
+
+	while (nb_desc <= __atomic_load_n(fc, __ATOMIC_RELAXED))
+		;
+}
+
 static __rte_always_inline uint64_t
 cn9k_nix_xmit_submit_lmt(const rte_iova_t io_addr)
 {
--
2.25.1