[PATCH v1 28/31] net/ntnic: add slicer (SLC LR) FPGA module

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

From: Oleksandr Kolomeiets <okl-plv@napatech.com>

The Slicer for Local Retransmit module can cut of the head a packet
before the packet leaves the FPGA RX pipeline.
This is used when the TX pipeline is configured
to add a new head in the packet.

Signed-off-by: Oleksandr Kolomeiets <okl-plv@napatech.com>
---
 drivers/net/ntnic/include/hw_mod_backend.h    | 21 ++++++
 drivers/net/ntnic/meson.build                 |  1 +
 .../nthw/flow_api/hw_mod/hw_mod_backend.c     |  4 ++
 .../nthw/flow_api/hw_mod/hw_mod_slc_lr.c      | 65 +++++++++++++++++++
 4 files changed, 91 insertions(+)
 create mode 100644 drivers/net/ntnic/nthw/flow_api/hw_mod/hw_mod_slc_lr.c

diff --git a/drivers/net/ntnic/include/hw_mod_backend.h b/drivers/net/ntnic/include/hw_mod_backend.h
index 13e0d1731e..b28192e682 100644
--- a/drivers/net/ntnic/include/hw_mod_backend.h
+++ b/drivers/net/ntnic/include/hw_mod_backend.h
@@ -7,6 +7,7 @@
 #define _HW_MOD_BACKEND_H_
 
 #include <stdbool.h>
+#include <string.h>
 
 #include "ntlog.h"
 
@@ -580,6 +581,25 @@ struct slc_lr_func_s {
 		struct hw_mod_slc_lr_v2_s v2;
 	};
 };
+enum hw_slc_lr_e {
+	/* functions */
+	HW_SLC_LR_RCP_PRESET_ALL = 0,
+	HW_SLC_LR_RCP_COMPARE,
+	HW_SLC_LR_RCP_FIND,
+	/* fields */
+	HW_SLC_LR_RCP_HEAD_SLC_EN = FIELD_START_INDEX,
+	HW_SLC_LR_RCP_HEAD_DYN,
+	HW_SLC_LR_RCP_HEAD_OFS,
+	HW_SLC_LR_RCP_TAIL_SLC_EN,
+	HW_SLC_LR_RCP_TAIL_DYN,
+	HW_SLC_LR_RCP_TAIL_OFS,
+	HW_SLC_LR_RCP_PCAP
+};
+bool hw_mod_slc_lr_present(struct flow_api_backend_s *be);
+int hw_mod_slc_lr_alloc(struct flow_api_backend_s *be);
+void hw_mod_slc_lr_free(struct flow_api_backend_s *be);
+int hw_mod_slc_lr_reset(struct flow_api_backend_s *be);
+int hw_mod_slc_lr_rcp_flush(struct flow_api_backend_s *be, int start_idx, int count);
 
 struct pdb_func_s {
 	COMMON_FUNC_INFO_S;
@@ -758,6 +778,7 @@ struct flow_api_backend_s {
 	struct flm_func_s flm;
 	struct hsh_func_s hsh;
 	struct qsl_func_s qsl;
+	struct slc_lr_func_s slc_lr;
 
 	/* NIC attributes */
 	unsigned int num_phy_ports;
diff --git a/drivers/net/ntnic/meson.build b/drivers/net/ntnic/meson.build
index 02981ef987..4caee8ac41 100644
--- a/drivers/net/ntnic/meson.build
+++ b/drivers/net/ntnic/meson.build
@@ -54,6 +54,7 @@ sources = files(
         'nthw/flow_api/hw_mod/hw_mod_hsh.c',
         'nthw/flow_api/hw_mod/hw_mod_km.c',
         'nthw/flow_api/hw_mod/hw_mod_qsl.c',
+        'nthw/flow_api/hw_mod/hw_mod_slc_lr.c',
         'nthw/flow_filter/flow_nthw_cat.c',
         'nthw/flow_filter/flow_nthw_csu.c',
         'nthw/flow_filter/flow_nthw_flm.c',
diff --git a/drivers/net/ntnic/nthw/flow_api/hw_mod/hw_mod_backend.c b/drivers/net/ntnic/nthw/flow_api/hw_mod/hw_mod_backend.c
index 4f16235a67..6b0ea2a4a6 100644
--- a/drivers/net/ntnic/nthw/flow_api/hw_mod/hw_mod_backend.c
+++ b/drivers/net/ntnic/nthw/flow_api/hw_mod/hw_mod_backend.c
@@ -22,6 +22,10 @@ static const struct {
 	{ "FLM", hw_mod_flm_alloc, hw_mod_flm_free, hw_mod_flm_reset, hw_mod_flm_present },
 	{ "HSH", hw_mod_hsh_alloc, hw_mod_hsh_free, hw_mod_hsh_reset, hw_mod_hsh_present },
 	{ "QSL", hw_mod_qsl_alloc, hw_mod_qsl_free, hw_mod_qsl_reset, hw_mod_qsl_present },
+	{
+		"SLC LR", hw_mod_slc_lr_alloc, hw_mod_slc_lr_free, hw_mod_slc_lr_reset,
+		hw_mod_slc_lr_present
+	},
 };
 #define MOD_COUNT (ARRAY_SIZE(module))
 
diff --git a/drivers/net/ntnic/nthw/flow_api/hw_mod/hw_mod_slc_lr.c b/drivers/net/ntnic/nthw/flow_api/hw_mod/hw_mod_slc_lr.c
new file mode 100644
index 0000000000..d95352ec67
--- /dev/null
+++ b/drivers/net/ntnic/nthw/flow_api/hw_mod/hw_mod_slc_lr.c
@@ -0,0 +1,65 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ * Copyright(c) 2023 Napatech A/S
+ */
+
+#include <stdint.h>
+#include <stdlib.h>
+
+#include "hw_mod_backend.h"
+
+#define _MOD_ "SLC_LR"
+#define _VER_ be->slc_lr.ver
+
+bool hw_mod_slc_lr_present(struct flow_api_backend_s *be)
+{
+	return be->iface->get_slc_lr_present(be->be_dev);
+}
+
+int hw_mod_slc_lr_alloc(struct flow_api_backend_s *be)
+{
+	_VER_ = be->iface->get_slc_lr_version(be->be_dev);
+	NT_LOG(DBG, FILTER, "SLC LR MODULE VERSION  %i.%i\n", VER_MAJOR(_VER_), VER_MINOR(_VER_));
+
+	switch (_VER_) {
+	case 2:
+		if (!callocate_mod((struct common_func_s *)&be->slc_lr, 1, &be->slc_lr.v2.rcp,
+				be->max_categories, sizeof(struct slc_lr_v2_rcp_s)))
+			return -1;
+
+		break;
+
+	default:
+		return UNSUP_VER;
+	}
+
+	return 0;
+}
+
+void hw_mod_slc_lr_free(struct flow_api_backend_s *be)
+{
+	if (be->slc_lr.base) {
+		free(be->slc_lr.base);
+		be->slc_lr.base = NULL;
+	}
+}
+
+int hw_mod_slc_lr_reset(struct flow_api_backend_s *be)
+{
+	/* Zero entire cache area */
+	zero_module_cache((struct common_func_s *)(&be->slc_lr));
+
+	NT_LOG(DBG, FILTER, "INIT SLC LR RCP\n");
+	return hw_mod_slc_lr_rcp_flush(be, 0, be->max_categories);
+}
+
+int hw_mod_slc_lr_rcp_flush(struct flow_api_backend_s *be, int start_idx, int count)
+{
+	if (count == ALL_ENTRIES)
+		count = be->max_categories;
+
+	if ((unsigned int)(start_idx + count) > be->max_categories)
+		return INDEX_TOO_LARGE;
+
+	return be->iface->slc_lr_rcp_flush(be->be_dev, &be->slc_lr, start_idx, count);
+}
-- 
2.45.0