[PATCH 2/4] event/cnxk: avoid reading non cached registers

[pbhagavatula]

From: Pavan Nikhilesh <pbhagavat...@marvell.com>

Avoid reading non-cached registers in fastpath.
PENDSTATE need not be read before tag flush in tx enqueue
context as we have additional checks prior to check for
pending flushes.

Signed-off-by: Pavan Nikhilesh <pbhagavat...@marvell.com>
---
 drivers/event/cnxk/cn9k_worker.h | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/event/cnxk/cn9k_worker.h b/drivers/event/cnxk/cn9k_worker.h
index 5782f3ed8f..653c51f616 100644
--- a/drivers/event/cnxk/cn9k_worker.h
+++ b/drivers/event/cnxk/cn9k_worker.h
@@ -156,6 +156,15 @@ cn9k_sso_hws_dual_forward_event(struct cn9k_sso_hws_dual 
*dws, uint64_t base,
        }
 }
 
+static __rte_always_inline void
+cn9k_sso_tx_tag_flush(uint64_t base)
+{
+       if (unlikely(CNXK_TT_FROM_TAG(plt_read64(base + SSOW_LF_GWS_TAG)) ==
+                    SSO_TT_EMPTY))
+               return;
+       plt_write64(0, base + SSOW_LF_GWS_OP_SWTAG_FLUSH);
+}
+
 static __rte_always_inline void
 cn9k_wqe_to_mbuf(uint64_t wqe, const uint64_t mbuf, uint8_t port_id,
                 const uint32_t tag, const uint32_t flags,
@@ -811,7 +820,7 @@ cn9k_sso_hws_event_tx(uint64_t base, struct rte_event *ev, 
uint64_t *cmd,
                        return 1;
        }
 
-       cnxk_sso_hws_swtag_flush(base);
+       cn9k_sso_tx_tag_flush(base);
 
        return 1;
 }
-- 
2.25.1