X-Git-Url: http://git.droids-corp.org/?a=blobdiff_plain;ds=sidebyside;f=drivers%2Fnet%2Fsfc%2Fsfc_ef100.h;h=5e2052d1429552b3ac66e8a633766a7073408fc6;hb=3c3ea76cffe0fc614555459d9741d2472cc3ac9a;hp=6da6cfabdb0a24c58fc5a6d7a17ec8d707b96363;hpb=554644e364ed846d8606e63a2344e58a5f01881a;p=dpdk.git

diff --git a/drivers/net/sfc/sfc_ef100.h b/drivers/net/sfc/sfc_ef100.h
index 6da6cfabdb..5e2052d142 100644
--- a/drivers/net/sfc/sfc_ef100.h
+++ b/drivers/net/sfc/sfc_ef100.h
@@ -1,6 +1,6 @@
 /* SPDX-License-Identifier: BSD-3-Clause
  *
- * Copyright(c) 2019-2020 Xilinx, Inc.
+ * Copyright(c) 2019-2021 Xilinx, Inc.
  * Copyright(c) 2018-2019 Solarflare Communications Inc.
  *
  * This software was jointly developed between OKTET Labs (under contract
@@ -14,6 +14,34 @@
 extern "C" {
 #endif
 
+/**
+ * Prime event queue to allow processed events to be reused.
+ *
+ * @param evq_prime	Global address of the prime register
+ * @param evq_hw_index	Event queue index
+ * @param evq_read_ptr	Masked event qeueu read pointer
+ */
+static inline void
+sfc_ef100_evq_prime(volatile void *evq_prime, unsigned int evq_hw_index,
+		    unsigned int evq_read_ptr)
+{
+	efx_dword_t dword;
+
+	EFX_POPULATE_DWORD_2(dword,
+			     ERF_GZ_EVQ_ID, evq_hw_index,
+			     ERF_GZ_IDX, evq_read_ptr);
+
+	/*
+	 * EvQ prime on EF100 allows HW to reuse descriptors. So we
+	 * should be sure that event descriptor reads are done.
+	 * However, there is implicit data dependency here since we
+	 * move past event if we have found out that the event has
+	 * come (i.e. we read it) and we have processed it.
+	 * So, no extra barriers are required here.
+	 */
+	rte_write32_relaxed(dword.ed_u32[0], evq_prime);
+}
+
 static inline bool
 sfc_ef100_ev_present(const efx_qword_t *ev, bool phase_bit)
 {