[PATCH v1 06/14] net/ntnic: add init for virt queues in the DBS

[Serhii Iliushyk <sil-plv@napatech.com>]

From: Danylo Vodopianov <dvo-plv@napatech.com>

DBS (DVIO Buffer System) module controls the scatter-gather buffer system
that let's the host CPU interact with packets.

Macros and Definitions: Defined constants for queue management and
polling speeds.

Data Structures: Added structures and arrays for RX and TX
queue management.

Procedures: Implemented initialization routines for setting up
queues and configuring Direct Buffer Storage (DBS) in FPGA.

Main Initialization: Allocates DBS modules, resets, and configures
RX and TX queues.

Signed-off-by: Danylo Vodopianov <dvo-plv@napatech.com>
---
 drivers/net/ntnic/dbsconfig/ntnic_dbsconfig.c | 154 ++++++++++++++++++
 drivers/net/ntnic/include/ntnic_dbs.h         |  71 +++++++-
 drivers/net/ntnic/meson.build                 |   2 +
 drivers/net/ntnic/nthw/dbs/nthw_dbs.c         | 135 +++++++++++++++
 .../ntnic/nthw/supported/nthw_fpga_mod_defs.h |   1 +
 drivers/net/ntnic/ntnic_mod_reg.c             |  11 +-
 drivers/net/ntnic/ntnic_mod_reg.h             |   2 +
 7 files changed, 374 insertions(+), 2 deletions(-)
 create mode 100644 drivers/net/ntnic/dbsconfig/ntnic_dbsconfig.c
 create mode 100644 drivers/net/ntnic/nthw/dbs/nthw_dbs.c

diff --git a/drivers/net/ntnic/dbsconfig/ntnic_dbsconfig.c b/drivers/net/ntnic/dbsconfig/ntnic_dbsconfig.c
new file mode 100644
index 0000000000..fc1dab6c5f
--- /dev/null
+++ b/drivers/net/ntnic/dbsconfig/ntnic_dbsconfig.c
@@ -0,0 +1,154 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2023 Napatech A/S
+ */
+
+#include <unistd.h>
+
+#include "ntos_drv.h"
+#include "ntnic_virt_queue.h"
+#include "ntnic_mod_reg.h"
+#include "ntlog.h"
+
+#define MAX_VIRT_QUEUES 128
+
+#define LAST_QUEUE 127
+#define DISABLE 0
+#define ENABLE 1
+#define RX_AM_DISABLE DISABLE
+#define RX_AM_ENABLE ENABLE
+#define RX_UW_DISABLE DISABLE
+#define RX_UW_ENABLE ENABLE
+#define RX_Q_DISABLE DISABLE
+#define RX_Q_ENABLE ENABLE
+#define RX_AM_POLL_SPEED 5
+#define RX_UW_POLL_SPEED 9
+#define INIT_QUEUE 1
+
+#define TX_AM_DISABLE DISABLE
+#define TX_AM_ENABLE ENABLE
+#define TX_UW_DISABLE DISABLE
+#define TX_UW_ENABLE ENABLE
+#define TX_Q_DISABLE DISABLE
+#define TX_Q_ENABLE ENABLE
+#define TX_AM_POLL_SPEED 5
+#define TX_UW_POLL_SPEED 8
+
+enum nthw_virt_queue_usage {
+	NTHW_VIRTQ_UNUSED = 0
+};
+
+struct nthw_virt_queue {
+	enum nthw_virt_queue_usage usage;
+};
+
+static struct nthw_virt_queue rxvq[MAX_VIRT_QUEUES];
+static struct nthw_virt_queue txvq[MAX_VIRT_QUEUES];
+
+static void dbs_init_rx_queue(nthw_dbs_t *p_nthw_dbs, uint32_t queue, uint32_t start_idx,
+	uint32_t start_ptr)
+{
+	uint32_t busy;
+	uint32_t init;
+	uint32_t dummy;
+
+	do {
+		get_rx_init(p_nthw_dbs, &init, &dummy, &busy);
+	} while (busy != 0);
+
+	set_rx_init(p_nthw_dbs, start_idx, start_ptr, INIT_QUEUE, queue);
+
+	do {
+		get_rx_init(p_nthw_dbs, &init, &dummy, &busy);
+	} while (busy != 0);
+}
+
+static void dbs_init_tx_queue(nthw_dbs_t *p_nthw_dbs, uint32_t queue, uint32_t start_idx,
+	uint32_t start_ptr)
+{
+	uint32_t busy;
+	uint32_t init;
+	uint32_t dummy;
+
+	do {
+		get_tx_init(p_nthw_dbs, &init, &dummy, &busy);
+	} while (busy != 0);
+
+	set_tx_init(p_nthw_dbs, start_idx, start_ptr, INIT_QUEUE, queue);
+
+	do {
+		get_tx_init(p_nthw_dbs, &init, &dummy, &busy);
+	} while (busy != 0);
+}
+
+static int nthw_virt_queue_init(struct fpga_info_s *p_fpga_info)
+{
+	assert(p_fpga_info);
+
+	nthw_fpga_t *const p_fpga = p_fpga_info->mp_fpga;
+	nthw_dbs_t *p_nthw_dbs;
+	int res = 0;
+	uint32_t i;
+
+	p_fpga_info->mp_nthw_dbs = NULL;
+
+	p_nthw_dbs = nthw_dbs_new();
+
+	if (p_nthw_dbs == NULL)
+		return -1;
+
+	res = dbs_init(NULL, p_fpga, 0);/* Check that DBS exists in FPGA */
+
+	if (res) {
+		free(p_nthw_dbs);
+		return res;
+	}
+
+	res = dbs_init(p_nthw_dbs, p_fpga, 0);	/* Create DBS module */
+
+	if (res) {
+		free(p_nthw_dbs);
+		return res;
+	}
+
+	p_fpga_info->mp_nthw_dbs = p_nthw_dbs;
+
+	for (i = 0; i < MAX_VIRT_QUEUES; ++i) {
+		rxvq[i].usage = NTHW_VIRTQ_UNUSED;
+		txvq[i].usage = NTHW_VIRTQ_UNUSED;
+	}
+
+	dbs_reset(p_nthw_dbs);
+
+	for (i = 0; i < NT_DBS_RX_QUEUES_MAX; ++i)
+		dbs_init_rx_queue(p_nthw_dbs, i, 0, 0);
+
+	for (i = 0; i < NT_DBS_TX_QUEUES_MAX; ++i)
+		dbs_init_tx_queue(p_nthw_dbs, i, 0, 0);
+
+	set_rx_control(p_nthw_dbs, LAST_QUEUE, RX_AM_DISABLE, RX_AM_POLL_SPEED, RX_UW_DISABLE,
+		RX_UW_POLL_SPEED, RX_Q_DISABLE);
+	set_rx_control(p_nthw_dbs, LAST_QUEUE, RX_AM_ENABLE, RX_AM_POLL_SPEED, RX_UW_ENABLE,
+		RX_UW_POLL_SPEED, RX_Q_DISABLE);
+	set_rx_control(p_nthw_dbs, LAST_QUEUE, RX_AM_ENABLE, RX_AM_POLL_SPEED, RX_UW_ENABLE,
+		RX_UW_POLL_SPEED, RX_Q_ENABLE);
+
+	set_tx_control(p_nthw_dbs, LAST_QUEUE, TX_AM_DISABLE, TX_AM_POLL_SPEED, TX_UW_DISABLE,
+		TX_UW_POLL_SPEED, TX_Q_DISABLE);
+	set_tx_control(p_nthw_dbs, LAST_QUEUE, TX_AM_ENABLE, TX_AM_POLL_SPEED, TX_UW_ENABLE,
+		TX_UW_POLL_SPEED, TX_Q_DISABLE);
+	set_tx_control(p_nthw_dbs, LAST_QUEUE, TX_AM_ENABLE, TX_AM_POLL_SPEED, TX_UW_ENABLE,
+		TX_UW_POLL_SPEED, TX_Q_ENABLE);
+
+	return 0;
+}
+
+static struct sg_ops_s sg_ops = {
+	.nthw_virt_queue_init = nthw_virt_queue_init
+};
+
+void sg_init(void)
+{
+	NT_LOG(INF, NTNIC, "SG ops initialized\n");
+	register_sg_ops(&sg_ops);
+}
diff --git a/drivers/net/ntnic/include/ntnic_dbs.h b/drivers/net/ntnic/include/ntnic_dbs.h
index 551c6ade43..a64d2a0aeb 100644
--- a/drivers/net/ntnic/include/ntnic_dbs.h
+++ b/drivers/net/ntnic/include/ntnic_dbs.h
@@ -8,12 +8,81 @@
 
 #include "nthw_fpga_model.h"
 
+#define NT_DBS_RX_QUEUES_MAX (128)
+#define NT_DBS_TX_QUEUES_MAX (128)
+
 /*
  * Struct for implementation of memory bank shadows
  */
 
-struct nthw_dbs_s;
+struct nthw_dbs_s {
+	nthw_fpga_t *mp_fpga;
+	nthw_module_t *mp_mod_dbs;
+	int mn_instance;
+
+	int mn_param_dbs_present;
+
+	nthw_register_t *mp_reg_rx_control;
+	nthw_field_t *mp_fld_rx_control_last_queue;
+	nthw_field_t *mp_fld_rx_control_avail_monitor_enable;
+	nthw_field_t *mp_fld_rx_control_avail_monitor_scan_speed;
+	nthw_field_t *mp_fld_rx_control_used_write_enable;
+	nthw_field_t *mp_fld_rx_control_used_writer_update_speed;
+	nthw_field_t *mp_fld_rx_control_rx_queues_enable;
+
+	nthw_register_t *mp_reg_tx_control;
+	nthw_field_t *mp_fld_tx_control_last_queue;
+	nthw_field_t *mp_fld_tx_control_avail_monitor_enable;
+	nthw_field_t *mp_fld_tx_control_avail_monitor_scan_speed;
+	nthw_field_t *mp_fld_tx_control_used_write_enable;
+	nthw_field_t *mp_fld_tx_control_used_writer_update_speed;
+	nthw_field_t *mp_fld_tx_control_tx_queues_enable;
+
+	nthw_register_t *mp_reg_rx_init;
+	nthw_field_t *mp_fld_rx_init_init;
+	nthw_field_t *mp_fld_rx_init_queue;
+	nthw_field_t *mp_fld_rx_init_busy;
+
+	nthw_register_t *mp_reg_rx_init_val;
+	nthw_field_t *mp_fld_rx_init_val_idx;
+	nthw_field_t *mp_fld_rx_init_val_ptr;
+
+	nthw_register_t *mp_reg_tx_init;
+	nthw_field_t *mp_fld_tx_init_init;
+	nthw_field_t *mp_fld_tx_init_queue;
+	nthw_field_t *mp_fld_tx_init_busy;
+
+	nthw_register_t *mp_reg_tx_init_val;
+	nthw_field_t *mp_fld_tx_init_val_idx;
+	nthw_field_t *mp_fld_tx_init_val_ptr;
+
+};
 
 typedef struct nthw_dbs_s nthw_dbs_t;
 
+nthw_dbs_t *nthw_dbs_new(void);
+int dbs_init(nthw_dbs_t *p, nthw_fpga_t *p_fpga, int n_instance);
+void dbs_reset(nthw_dbs_t *p);
+
+int set_rx_control(nthw_dbs_t *p,
+	uint32_t last_queue,
+	uint32_t avail_monitor_enable,
+	uint32_t avail_monitor_speed,
+	uint32_t used_write_enable,
+	uint32_t used_write_speed,
+	uint32_t rx_queue_enable);
+int set_tx_control(nthw_dbs_t *p,
+	uint32_t last_queue,
+	uint32_t avail_monitor_enable,
+	uint32_t avail_monitor_speed,
+	uint32_t used_write_enable,
+	uint32_t used_write_speed,
+	uint32_t tx_queue_enable);
+int set_rx_init(nthw_dbs_t *p, uint32_t start_idx, uint32_t start_ptr, uint32_t init,
+	uint32_t queue);
+int get_rx_init(nthw_dbs_t *p, uint32_t *init, uint32_t *queue, uint32_t *busy);
+int set_tx_init(nthw_dbs_t *p, uint32_t start_idx, uint32_t start_ptr, uint32_t init,
+	uint32_t queue);
+int get_tx_init(nthw_dbs_t *p, uint32_t *init, uint32_t *queue, uint32_t *busy);
+
 #endif	/* _NTNIC_DBS_H_ */
diff --git a/drivers/net/ntnic/meson.build b/drivers/net/ntnic/meson.build
index 66d2770da7..3d9566a52e 100644
--- a/drivers/net/ntnic/meson.build
+++ b/drivers/net/ntnic/meson.build
@@ -24,9 +24,11 @@ includes = [
 # all sources
 sources = files(
         'adapter/nt4ga_adapter.c',
+        'dbsconfig/ntnic_dbsconfig.c',
         'link_mgmt/link_100g/nt4ga_link_100g.c',
         'link_mgmt/nt4ga_link.c',
         'nim/i2c_nim.c',
+        'nthw/dbs/nthw_dbs.c',
         'nthw/supported/nthw_fpga_9563_055_049_0000.c',
         'nthw/supported/nthw_fpga_instances.c',
         'nthw/supported/nthw_fpga_mod_str_map.c',
diff --git a/drivers/net/ntnic/nthw/dbs/nthw_dbs.c b/drivers/net/ntnic/nthw/dbs/nthw_dbs.c
new file mode 100644
index 0000000000..853d7bc1ec
--- /dev/null
+++ b/drivers/net/ntnic/nthw/dbs/nthw_dbs.c
@@ -0,0 +1,135 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2023 Napatech A/S
+ */
+
+#include <errno.h>
+#include "ntlog.h"
+
+#include "nthw_drv.h"
+#include "nthw_register.h"
+
+nthw_dbs_t *nthw_dbs_new(void)
+{
+	nthw_dbs_t *p = malloc(sizeof(nthw_dbs_t));
+
+	if (p)
+		memset(p, 0, sizeof(nthw_dbs_t));
+
+	return p;
+}
+
+int dbs_init(nthw_dbs_t *p, nthw_fpga_t *p_fpga, int n_instance)
+{
+	nthw_module_t *mod = nthw_fpga_query_module(p_fpga, MOD_DBS, n_instance);
+
+	if (p == NULL)
+		return mod == NULL ? -1 : 0;
+
+	if (mod == NULL) {
+		NT_LOG(ERR, NTHW, "%s: DBS %d: no such instance\n",
+			p_fpga->p_fpga_info->mp_adapter_id_str, n_instance);
+		return -1;
+	}
+
+	p->mp_fpga = p_fpga;
+	p->mn_instance = n_instance;
+	p->mp_mod_dbs = mod;
+
+	p->mn_param_dbs_present = nthw_fpga_get_product_param(p_fpga, NT_DBS_PRESENT, 0);
+
+	if (p->mn_param_dbs_present == 0) {
+		NT_LOG(WRN, NTHW,
+			"%s: DBS %d: logical error: module found but not flagged at present\n",
+			p->mp_fpga->p_fpga_info->mp_adapter_id_str, p->mn_instance);
+	}
+
+	return 0;
+}
+
+void dbs_reset(nthw_dbs_t *p)
+{
+	(void)p;
+}
+
+int set_rx_control(nthw_dbs_t *p,
+	uint32_t last_queue,
+	uint32_t avail_monitor_enable,
+	uint32_t avail_monitor_speed,
+	uint32_t used_write_enable,
+	uint32_t used_write_speed,
+	uint32_t rx_queue_enable)
+{
+	nthw_field_set_val32(p->mp_fld_rx_control_last_queue, last_queue);
+	nthw_field_set_val32(p->mp_fld_rx_control_avail_monitor_enable, avail_monitor_enable);
+	nthw_field_set_val32(p->mp_fld_rx_control_avail_monitor_scan_speed, avail_monitor_speed);
+	nthw_field_set_val32(p->mp_fld_rx_control_used_write_enable, used_write_enable);
+	nthw_field_set_val32(p->mp_fld_rx_control_used_writer_update_speed, used_write_speed);
+	nthw_field_set_val32(p->mp_fld_rx_control_rx_queues_enable, rx_queue_enable);
+	nthw_register_flush(p->mp_reg_rx_control, 1);
+	return 0;
+}
+
+int set_tx_control(nthw_dbs_t *p,
+	uint32_t last_queue,
+	uint32_t avail_monitor_enable,
+	uint32_t avail_monitor_speed,
+	uint32_t used_write_enable,
+	uint32_t used_write_speed,
+	uint32_t tx_queue_enable)
+{
+	nthw_field_set_val32(p->mp_fld_tx_control_last_queue, last_queue);
+	nthw_field_set_val32(p->mp_fld_tx_control_avail_monitor_enable, avail_monitor_enable);
+	nthw_field_set_val32(p->mp_fld_tx_control_avail_monitor_scan_speed, avail_monitor_speed);
+	nthw_field_set_val32(p->mp_fld_tx_control_used_write_enable, used_write_enable);
+	nthw_field_set_val32(p->mp_fld_tx_control_used_writer_update_speed, used_write_speed);
+	nthw_field_set_val32(p->mp_fld_tx_control_tx_queues_enable, tx_queue_enable);
+	nthw_register_flush(p->mp_reg_tx_control, 1);
+	return 0;
+}
+
+int set_rx_init(nthw_dbs_t *p, uint32_t start_idx, uint32_t start_ptr, uint32_t init,
+	uint32_t queue)
+{
+	if (p->mp_reg_rx_init_val) {
+		nthw_field_set_val32(p->mp_fld_rx_init_val_idx, start_idx);
+		nthw_field_set_val32(p->mp_fld_rx_init_val_ptr, start_ptr);
+		nthw_register_flush(p->mp_reg_rx_init_val, 1);
+	}
+
+	nthw_field_set_val32(p->mp_fld_rx_init_init, init);
+	nthw_field_set_val32(p->mp_fld_rx_init_queue, queue);
+	nthw_register_flush(p->mp_reg_rx_init, 1);
+	return 0;
+}
+
+int get_rx_init(nthw_dbs_t *p, uint32_t *init, uint32_t *queue, uint32_t *busy)
+{
+	*init = nthw_field_get_val32(p->mp_fld_rx_init_init);
+	*queue = nthw_field_get_val32(p->mp_fld_rx_init_queue);
+	*busy = nthw_field_get_val32(p->mp_fld_rx_init_busy);
+	return 0;
+}
+
+int set_tx_init(nthw_dbs_t *p, uint32_t start_idx, uint32_t start_ptr, uint32_t init,
+	uint32_t queue)
+{
+	if (p->mp_reg_tx_init_val) {
+		nthw_field_set_val32(p->mp_fld_tx_init_val_idx, start_idx);
+		nthw_field_set_val32(p->mp_fld_tx_init_val_ptr, start_ptr);
+		nthw_register_flush(p->mp_reg_tx_init_val, 1);
+	}
+
+	nthw_field_set_val32(p->mp_fld_tx_init_init, init);
+	nthw_field_set_val32(p->mp_fld_tx_init_queue, queue);
+	nthw_register_flush(p->mp_reg_tx_init, 1);
+	return 0;
+}
+
+int get_tx_init(nthw_dbs_t *p, uint32_t *init, uint32_t *queue, uint32_t *busy)
+{
+	*init = nthw_field_get_val32(p->mp_fld_tx_init_init);
+	*queue = nthw_field_get_val32(p->mp_fld_tx_init_queue);
+	*busy = nthw_field_get_val32(p->mp_fld_tx_init_busy);
+	return 0;
+}
diff --git a/drivers/net/ntnic/nthw/supported/nthw_fpga_mod_defs.h b/drivers/net/ntnic/nthw/supported/nthw_fpga_mod_defs.h
index 5d6aac122c..b6be02f45e 100644
--- a/drivers/net/ntnic/nthw/supported/nthw_fpga_mod_defs.h
+++ b/drivers/net/ntnic/nthw/supported/nthw_fpga_mod_defs.h
@@ -16,6 +16,7 @@
 #define MOD_UNKNOWN (0L)/* Unknown/uninitialized - keep this as the first element */
 #define MOD_CAT (0x30b447c2UL)
 #define MOD_CSU (0x3f470787UL)
+#define MOD_DBS (0x80b29727UL)
 #define MOD_FLM (0xe7ba53a4UL)
 #define MOD_GFG (0xfc423807UL)
 #define MOD_GMF (0x68b1d15aUL)
diff --git a/drivers/net/ntnic/ntnic_mod_reg.c b/drivers/net/ntnic/ntnic_mod_reg.c
index 8fe5193027..a03c97801b 100644
--- a/drivers/net/ntnic/ntnic_mod_reg.c
+++ b/drivers/net/ntnic/ntnic_mod_reg.c
@@ -5,9 +5,18 @@
 
 #include "ntnic_mod_reg.h"
 
+static struct sg_ops_s *sg_ops;
+
+void register_sg_ops(struct sg_ops_s *ops)
+{
+	sg_ops = ops;
+}
+
 const struct sg_ops_s *get_sg_ops(void)
 {
-	return NULL;
+	if (sg_ops == NULL)
+		sg_init();
+	return sg_ops;
 }
 
 static struct link_ops_s *link_100g_ops;
diff --git a/drivers/net/ntnic/ntnic_mod_reg.h b/drivers/net/ntnic/ntnic_mod_reg.h
index e9dff51935..5b97b3d8ac 100644
--- a/drivers/net/ntnic/ntnic_mod_reg.h
+++ b/drivers/net/ntnic/ntnic_mod_reg.h
@@ -105,7 +105,9 @@ struct sg_ops_s {
 	int (*nthw_virt_queue_init)(struct fpga_info_s *p_fpga_info);
 };
 
+void register_sg_ops(struct sg_ops_s *ops);
 const struct sg_ops_s *get_sg_ops(void);
+void sg_init(void);
 
 struct link_ops_s {
 	int (*link_init)(struct adapter_info_s *p_adapter_info, nthw_fpga_t *p_fpga);
-- 
2.45.0