raw/cnxk_gpio: enqueue buffers

Add dummy support for enqueuing buffers.

Signed-off-by: Tomasz Duszynski <tduszynski@marvell.com>

drivers/raw/cnxk_gpio/cnxk_gpio.c

@@ -14,6 +14,7 @@
 #include <roc_api.h>
 
 #include "cnxk_gpio.h"
+#include "rte_pmd_cnxk_gpio.h"
 
 #define CNXK_GPIO_BUFSZ 128
 #define CNXK_GPIO_CLASS_PATH "/sys/class/gpio"
@@ -274,8 +275,54 @@ cnxk_gpio_dev_close(struct rte_rawdev *dev)
 	return 0;
 }
 
+static int
+cnxk_gpio_process_buf(struct cnxk_gpio *gpio, struct rte_rawdev_buf *rbuf)
+{
+	struct cnxk_gpio_msg *msg = rbuf->buf_addr;
+	void *rsp = NULL;
+	int ret;
+
+	switch (msg->type) {
+	default:
+		return -EINVAL;
+	}
+
+	/* get rid of last response if any */
+	if (gpio->rsp) {
+		RTE_LOG(WARNING, PMD, "previous response got overwritten\n");
+		rte_free(gpio->rsp);
+	}
+	gpio->rsp = rsp;
+
+	return ret;
+}
+
+static int
+cnxk_gpio_enqueue_bufs(struct rte_rawdev *dev, struct rte_rawdev_buf **buffers,
+		       unsigned int count, rte_rawdev_obj_t context)
+{
+	struct cnxk_gpiochip *gpiochip = dev->dev_private;
+	unsigned int queue = (size_t)context;
+	struct cnxk_gpio *gpio;
+	int ret;
+
+	if (count == 0)
+		return 0;
+
+	gpio = cnxk_gpio_lookup(gpiochip, queue);
+	if (!gpio)
+		return -ENODEV;
+
+	ret = cnxk_gpio_process_buf(gpio, buffers[0]);
+	if (ret)
+		return ret;
+
+	return 1;
+}
+
 static const struct rte_rawdev_ops cnxk_gpio_rawdev_ops = {
 	.dev_close = cnxk_gpio_dev_close,
+	.enqueue_bufs = cnxk_gpio_enqueue_bufs,
 	.queue_def_conf = cnxk_gpio_queue_def_conf,
 	.queue_count = cnxk_gpio_queue_count,
 	.queue_setup = cnxk_gpio_queue_setup,

drivers/raw/cnxk_gpio/cnxk_gpio.h

@@ -9,6 +9,7 @@ struct cnxk_gpiochip;
 
 struct cnxk_gpio {
 	struct cnxk_gpiochip *gpiochip;
+	void *rsp;
 	int num;
 };
 

drivers/raw/cnxk_gpio/meson.build

@@ -6,3 +6,4 @@ deps += ['bus_vdev', 'common_cnxk', 'rawdev', 'kvargs']
 sources = files(
         'cnxk_gpio.c',
 )
+headers = files('rte_pmd_cnxk_gpio.h')

drivers/raw/cnxk_gpio/rte_pmd_cnxk_gpio.h

@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(C) 2021 Marvell.
+ */
+
+#ifndef _RTE_PMD_CNXK_GPIO_H_
+#define _RTE_PMD_CNXK_GPIO_H_
+
+/**
+ * @file rte_pmd_cnxk_gpio.h
+ *
+ * Marvell GPIO PMD specific structures and interface
+ *
+ * This API allows applications to manage GPIOs in user space along with
+ * installing interrupt handlers for low latency signal processing.
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Available message types */
+enum cnxk_gpio_msg_type {
+	/** Invalid message type */
+	CNXK_GPIO_MSG_TYPE_INVALID,
+};
+
+struct cnxk_gpio_msg {
+	/** Message type */
+	enum cnxk_gpio_msg_type type;
+	/** Message data passed to PMD or received from PMD */
+	void *data;
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _RTE_PMD_CNXK_GPIO_H_ */