[dpdk-dev] [PATCH v4 18/22] event/dlb: add PMD's token pop public interface

[Timothy McDaniel]

The PMD uses a public interface to allow applications to
control the token pop mode. Supported token pop modes are
as follows, and they impact core scheduling affinity for
ldb ports.

AUTO_POP: Pop the CQ tokens immediately after dequeueing.
DELAYED_POP: Pop CQ tokens after (dequeue_depth - 1) events
	     are released. Supported on load-balanced ports
	     only.
DEFERRED_POP: Pop the CQ tokens during next dequeue operation.

Signed-off-by: Timothy McDaniel <timothy.mcdaniel at intel.com>
---
 drivers/event/dlb/meson.build                   |  4 ++-
 drivers/event/dlb/rte_pmd_dlb.c                 | 38 +++++++++++++++++++++++++
 drivers/event/dlb/rte_pmd_dlb_event_version.map |  6 ++++
 3 files changed, 47 insertions(+), 1 deletion(-)
 create mode 100644 drivers/event/dlb/rte_pmd_dlb.c

diff --git a/drivers/event/dlb/meson.build b/drivers/event/dlb/meson.build
index 6f87274..d7aeb3b 100644
--- a/drivers/event/dlb/meson.build
+++ b/drivers/event/dlb/meson.build
@@ -6,7 +6,9 @@ sources = files('dlb.c',
 		'dlb_xstats.c',
 		'pf/dlb_main.c',
 		'pf/dlb_pf.c',
-		'pf/base/dlb_resource.c'
+		'pf/base/dlb_resource.c',
+		'rte_pmd_dlb.c',
 )
 
 deps += ['mbuf', 'mempool', 'ring', 'pci', 'bus_pci']
+install_headers('rte_pmd_dlb.h')
diff --git a/drivers/event/dlb/rte_pmd_dlb.c b/drivers/event/dlb/rte_pmd_dlb.c
new file mode 100644
index 0000000..bc802d3
--- /dev/null
+++ b/drivers/event/dlb/rte_pmd_dlb.c
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2020 Intel Corporation
+ */
+
+#include "rte_eventdev.h"
+#include "rte_eventdev_pmd.h"
+#include "rte_pmd_dlb.h"
+#include "dlb_priv.h"
+#include "dlb_inline_fns.h"
+
+int
+rte_pmd_dlb_set_token_pop_mode(uint8_t dev_id,
+			       uint8_t port_id,
+			       enum dlb_token_pop_mode mode)
+{
+	struct dlb_eventdev *dlb;
+	struct rte_eventdev *dev;
+
+	RTE_EVENTDEV_VALID_DEVID_OR_ERR_RET(dev_id, -EINVAL);
+	dev = &rte_eventdevs[dev_id];
+
+	dlb = dlb_pmd_priv(dev);
+
+	if (mode >= NUM_TOKEN_POP_MODES)
+		return -EINVAL;
+
+	/* The event device must be configured, but not yet started */
+	if (!dlb->configured || dlb->run_state != DLB_RUN_STATE_STOPPED)
+		return -EINVAL;
+
+	/* The token pop mode must be set before configuring the port */
+	if (port_id >= dlb->num_ports || dlb->ev_ports[port_id].setup_done)
+		return -EINVAL;
+
+	dlb->ev_ports[port_id].qm_port.token_pop_mode = mode;
+
+	return 0;
+}
diff --git a/drivers/event/dlb/rte_pmd_dlb_event_version.map b/drivers/event/dlb/rte_pmd_dlb_event_version.map
index 299ae63..b7b65d3 100644
--- a/drivers/event/dlb/rte_pmd_dlb_event_version.map
+++ b/drivers/event/dlb/rte_pmd_dlb_event_version.map
@@ -1,3 +1,9 @@
 DPDK_21.0 {
 	local: *;
 };
+
+EXPERIMENTAL {
+	global:
+
+	rte_pmd_dlb_set_token_pop_mode;
+};
-- 
2.6.4