[dpdk-dev] [PATCH v2 2/2] octeontx: move mbox to common folder

Pavan Nikhilesh pbhagavatula at caviumnetworks.com
Tue Mar 20 15:40:46 CET 2018


Move commonly used functions across mempool, event and net devices to a
common folder in drivers.

Signed-off-by: Pavan Nikhilesh <pbhagavatula at caviumnetworks.com>
---
 drivers/common/Makefile                            |  4 ++
 drivers/common/meson.build                         |  1 +
 drivers/common/octeontx/Makefile                   | 24 ++++++++
 drivers/common/octeontx/meson.build                |  6 ++
 .../{mempool => common}/octeontx/octeontx_mbox.c   | 65 +++++++++++++++++-----
 .../{mempool => common}/octeontx/octeontx_mbox.h   | 14 +++++
 .../octeontx/rte_octeontx_common_version.map       |  9 +++
 drivers/event/octeontx/Makefile                    |  4 +-
 drivers/event/octeontx/meson.build                 |  5 +-
 .../{mempool => event}/octeontx/octeontx_ssovf.c   | 20 ++++++-
 drivers/mempool/octeontx/Makefile                  |  5 +-
 drivers/mempool/octeontx/meson.build               |  6 +-
 drivers/mempool/octeontx/octeontx_fpavf.c          |  4 --
 drivers/mempool/octeontx/octeontx_pool_logs.h      |  9 ---
 .../octeontx/rte_mempool_octeontx_version.map      |  6 --
 drivers/net/octeontx/Makefile                      |  3 +-
 mk/rte.app.mk                                      |  4 ++
 17 files changed, 144 insertions(+), 45 deletions(-)
 create mode 100644 drivers/common/octeontx/Makefile
 create mode 100644 drivers/common/octeontx/meson.build
 rename drivers/{mempool => common}/octeontx/octeontx_mbox.c (83%)
 rename drivers/{mempool => common}/octeontx/octeontx_mbox.h (66%)
 create mode 100644 drivers/common/octeontx/rte_octeontx_common_version.map
 rename drivers/{mempool => event}/octeontx/octeontx_ssovf.c (92%)

diff --git a/drivers/common/Makefile b/drivers/common/Makefile
index 192066307..0fd223761 100644
--- a/drivers/common/Makefile
+++ b/drivers/common/Makefile
@@ -4,4 +4,8 @@
 
 include $(RTE_SDK)/mk/rte.vars.mk
 
+ifeq ($(CONFIG_RTE_LIBRTE_PMD_OCTEONTX_SSOVF)$(CONFIG_RTE_LIBRTE_OCTEONTX_MEMPOOL),yy)
+DIRS-y += octeontx
+endif
+
 include $(RTE_SDK)/mk/rte.subdir.mk
diff --git a/drivers/common/meson.build b/drivers/common/meson.build
index 9c2565f00..fcb3617d0 100644
--- a/drivers/common/meson.build
+++ b/drivers/common/meson.build
@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2018 Cavium, Inc
 
+drivers = ['octeontx']
 config_flag_fmt = 'RTE_LIBRTE_ at 0@_COMMON'
 driver_name_fmt = 'rte_ at 0@_common'
diff --git a/drivers/common/octeontx/Makefile b/drivers/common/octeontx/Makefile
new file mode 100644
index 000000000..62b021f4a
--- /dev/null
+++ b/drivers/common/octeontx/Makefile
@@ -0,0 +1,24 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2018 Cavium, Inc
+#
+
+include $(RTE_SDK)/mk/rte.vars.mk
+
+#
+# library name
+#
+LIB = librte_octeontx_common.a
+
+CFLAGS += $(WERROR_FLAGS)
+EXPORT_MAP := rte_octeontx_common_version.map
+
+LIBABIVER := 1
+
+#
+# all source are stored in SRCS-y
+#
+SRCS-y += octeontx_mbox.c
+
+LDLIBS += -lrte_eal
+
+include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/drivers/common/octeontx/meson.build b/drivers/common/octeontx/meson.build
new file mode 100644
index 000000000..8a28ce800
--- /dev/null
+++ b/drivers/common/octeontx/meson.build
@@ -0,0 +1,6 @@
+# SPDX-License-Identifier: BSD-3-Clause
+# Copyright(c) 2018 Cavium, Inc
+#
+
+sources = files('octeontx_mbox.c'
+)
diff --git a/drivers/mempool/octeontx/octeontx_mbox.c b/drivers/common/octeontx/octeontx_mbox.c
similarity index 83%
rename from drivers/mempool/octeontx/octeontx_mbox.c
rename to drivers/common/octeontx/octeontx_mbox.c
index f8cb6a453..c98e110f3 100644
--- a/drivers/mempool/octeontx/octeontx_mbox.c
+++ b/drivers/common/octeontx/octeontx_mbox.c
@@ -11,7 +11,6 @@
 #include <rte_spinlock.h>
 
 #include "octeontx_mbox.h"
-#include "octeontx_pool_logs.h"
 
 /* Mbox operation timeout in seconds */
 #define MBOX_WAIT_TIME_SEC	3
@@ -60,6 +59,17 @@ struct mbox_ram_hdr {
 	};
 };
 
+int octeontx_logtype_mbox;
+
+RTE_INIT(otx_init_log);
+static void
+otx_init_log(void)
+{
+	octeontx_logtype_mbox = rte_log_register("pmd.octeontx.mbox");
+	if (octeontx_logtype_mbox >= 0)
+		rte_log_set_level(octeontx_logtype_mbox, RTE_LOG_NOTICE);
+}
+
 static inline void
 mbox_msgcpy(volatile uint8_t *d, volatile const uint8_t *s, uint16_t size)
 {
@@ -181,22 +191,49 @@ mbox_send(struct mbox *m, struct octeontx_mbox_hdr *hdr, const void *txmsg,
 	return res;
 }
 
-static inline int
-mbox_setup(struct mbox *m)
+int
+octeontx_mbox_set_ram_mbox_base(uint8_t *ram_mbox_base)
+{
+	struct mbox *m = &octeontx_mbox;
+
+	if (m->init_once)
+		return -EALREADY;
+
+	if (ram_mbox_base == NULL) {
+		mbox_log_err("Invalid ram_mbox_base=%p", ram_mbox_base);
+		return -EINVAL;
+	}
+
+	m->ram_mbox_base = ram_mbox_base;
+
+	if (m->reg != NULL) {
+		rte_spinlock_init(&m->lock);
+		m->init_once = 1;
+	}
+
+	return 0;
+}
+
+int
+octeontx_mbox_set_reg(uint8_t *reg)
 {
-	if (unlikely(m->init_once == 0)) {
+	struct mbox *m = &octeontx_mbox;
+
+	if (m->init_once)
+		return -EALREADY;
+
+	if (reg == NULL) {
+		mbox_log_err("Invalid reg=%p", reg);
+		return -EINVAL;
+	}
+
+	m->reg = reg;
+
+	if (m->ram_mbox_base != NULL) {
 		rte_spinlock_init(&m->lock);
-		m->ram_mbox_base = octeontx_ssovf_bar(OCTEONTX_SSO_HWS, 0, 4);
-		m->reg = octeontx_ssovf_bar(OCTEONTX_SSO_GROUP, 0, 0);
-		m->reg += SSO_VHGRP_PF_MBOX(1);
-
-		if (m->ram_mbox_base == NULL || m->reg == NULL) {
-			mbox_log_err("Invalid ram_mbox_base=%p or reg=%p",
-				m->ram_mbox_base, m->reg);
-			return -EINVAL;
-		}
 		m->init_once = 1;
 	}
+
 	return 0;
 }
 
@@ -207,7 +244,7 @@ octeontx_ssovf_mbox_send(struct octeontx_mbox_hdr *hdr, void *txdata,
 	struct mbox *m = &octeontx_mbox;
 
 	RTE_BUILD_BUG_ON(sizeof(struct mbox_ram_hdr) != 8);
-	if (rte_eal_process_type() != RTE_PROC_PRIMARY || mbox_setup(m))
+	if (rte_eal_process_type() != RTE_PROC_PRIMARY)
 		return -EINVAL;
 
 	return mbox_send(m, hdr, txdata, txlen, rxdata, rxlen);
diff --git a/drivers/mempool/octeontx/octeontx_mbox.h b/drivers/common/octeontx/octeontx_mbox.h
similarity index 66%
rename from drivers/mempool/octeontx/octeontx_mbox.h
rename to drivers/common/octeontx/octeontx_mbox.h
index 1b056071a..52fae4ef9 100644
--- a/drivers/mempool/octeontx/octeontx_mbox.h
+++ b/drivers/common/octeontx/octeontx_mbox.h
@@ -6,10 +6,22 @@
 #define __OCTEONTX_MBOX_H__
 
 #include <rte_common.h>
+#include <rte_spinlock.h>
 
 #define SSOW_BAR4_LEN			(64 * 1024)
 #define SSO_VHGRP_PF_MBOX(x)		(0x200ULL | ((x) << 3))
 
+#define MBOX_LOG(level, fmt, args...) \
+	rte_log(RTE_LOG_ ## level, octeontx_logtype_mbox,\
+			"%s() line %u: " fmt "\n", __func__, __LINE__, ## args)
+
+#define mbox_log_info(fmt, ...) MBOX_LOG(INFO, fmt, ##__VA_ARGS__)
+#define mbox_log_dbg(fmt, ...) MBOX_LOG(DEBUG, fmt, ##__VA_ARGS__)
+#define mbox_log_err(fmt, ...) MBOX_LOG(ERR, fmt, ##__VA_ARGS__)
+#define mbox_func_trace mbox_log_dbg
+
+extern int octeontx_logtype_mbox;
+
 struct octeontx_ssovf_info {
 	uint16_t domain; /* Domain id */
 	uint8_t total_ssovfs; /* Total sso groups available in domain */
@@ -30,6 +42,8 @@ struct octeontx_mbox_hdr {
 
 int octeontx_ssovf_info(struct octeontx_ssovf_info *info);
 void *octeontx_ssovf_bar(enum octeontx_ssovf_type, uint8_t id, uint8_t bar);
+int octeontx_mbox_set_ram_mbox_base(uint8_t *ram_mbox_base);
+int octeontx_mbox_set_reg(uint8_t *reg);
 int octeontx_ssovf_mbox_send(struct octeontx_mbox_hdr *hdr,
 		void *txdata, uint16_t txlen, void *rxdata, uint16_t rxlen);
 
diff --git a/drivers/common/octeontx/rte_octeontx_common_version.map b/drivers/common/octeontx/rte_octeontx_common_version.map
new file mode 100644
index 000000000..ca3a815a7
--- /dev/null
+++ b/drivers/common/octeontx/rte_octeontx_common_version.map
@@ -0,0 +1,9 @@
+DPDK_18.02 {
+	global:
+
+	octeontx_ssovf_info;
+	octeontx_ssovf_bar;
+	octeontx_mbox_set_ram_mbox_base;
+	octeontx_mbox_set_reg;
+	octeontx_ssovf_mbox_send;
+};
diff --git a/drivers/event/octeontx/Makefile b/drivers/event/octeontx/Makefile
index 0e49efd84..097608061 100644
--- a/drivers/event/octeontx/Makefile
+++ b/drivers/event/octeontx/Makefile
@@ -10,10 +10,11 @@ include $(RTE_SDK)/mk/rte.vars.mk
 LIB = librte_pmd_octeontx_ssovf.a
 
 CFLAGS += $(WERROR_FLAGS)
+CFLAGS += -I$(RTE_SDK)/drivers/common/octeontx/
 CFLAGS += -I$(RTE_SDK)/drivers/mempool/octeontx/
 CFLAGS += -I$(RTE_SDK)/drivers/net/octeontx/
 
-LDLIBS += -lrte_eal -lrte_eventdev -lrte_mempool_octeontx -lrte_pmd_octeontx
+LDLIBS += -lrte_eal -lrte_eventdev -lrte_octeontx_common -lrte_pmd_octeontx
 LDLIBS += -lrte_bus_pci -lrte_mempool -lrte_mbuf -lrte_kvargs
 LDLIBS += -lrte_bus_vdev
 
@@ -27,6 +28,7 @@ LIBABIVER := 1
 SRCS-$(CONFIG_RTE_LIBRTE_PMD_OCTEONTX_SSOVF) += ssovf_worker.c
 SRCS-$(CONFIG_RTE_LIBRTE_PMD_OCTEONTX_SSOVF) += ssovf_evdev.c
 SRCS-$(CONFIG_RTE_LIBRTE_PMD_OCTEONTX_SSOVF) += ssovf_evdev_selftest.c
+SRCS-$(CONFIG_RTE_LIBRTE_PMD_OCTEONTX_SSOVF) += octeontx_ssovf.c
 
 ifeq ($(CONFIG_RTE_TOOLCHAIN_GCC),y)
 CFLAGS_ssovf_worker.o += -fno-prefetch-loop-arrays
diff --git a/drivers/event/octeontx/meson.build b/drivers/event/octeontx/meson.build
index 358fc9fc9..c5e88dfd8 100644
--- a/drivers/event/octeontx/meson.build
+++ b/drivers/event/octeontx/meson.build
@@ -3,7 +3,8 @@
 
 sources = files('ssovf_worker.c',
 		'ssovf_evdev.c',
-		'ssovf_evdev_selftest.c'
+		'ssovf_evdev_selftest.c',
+		'octeontx_ssovf.c'
 )
 
-deps += ['mempool_octeontx', 'bus_vdev', 'pmd_octeontx']
+deps += ['octeontx_common', 'mempool_octeontx', 'bus_vdev', 'pmd_octeontx']
diff --git a/drivers/mempool/octeontx/octeontx_ssovf.c b/drivers/event/octeontx/octeontx_ssovf.c
similarity index 92%
rename from drivers/mempool/octeontx/octeontx_ssovf.c
rename to drivers/event/octeontx/octeontx_ssovf.c
index 97b240665..c32b49a01 100644
--- a/drivers/mempool/octeontx/octeontx_ssovf.c
+++ b/drivers/event/octeontx/octeontx_ssovf.c
@@ -10,7 +10,6 @@
 #include <rte_bus_pci.h>
 
 #include "octeontx_mbox.h"
-#include "octeontx_pool_logs.h"
 
 #define PCI_VENDOR_ID_CAVIUM              0x177D
 #define PCI_DEVICE_ID_OCTEONTX_SSOGRP_VF  0xA04B
@@ -142,6 +141,7 @@ ssowvf_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 	uint16_t vfid;
 	struct ssowvf_res *res;
 	struct ssowvf_identify *id;
+	uint8_t *ram_mbox_base;
 
 	RTE_SET_USED(pci_drv);
 
@@ -180,6 +180,14 @@ ssowvf_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 	res->domain = id->domain;
 
 	sdev.total_ssowvfs++;
+	if (!vfid) {
+		ram_mbox_base = octeontx_ssovf_bar(OCTEONTX_SSO_HWS, 0, 4);
+		if (octeontx_mbox_set_ram_mbox_base(ram_mbox_base)) {
+			mbox_log_err("Invalid Failed to set ram mbox base");
+			return -EINVAL;
+		}
+	}
+
 	rte_wmb();
 	mbox_log_dbg("Domain=%d hws=%d total_ssowvfs=%d", res->domain,
 			res->vfid, sdev.total_ssowvfs);
@@ -213,6 +221,7 @@ ssovf_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 	uint16_t vfid;
 	uint8_t *idreg;
 	struct ssovf_res *res;
+	uint8_t *reg;
 
 	RTE_SET_USED(pci_drv);
 
@@ -246,6 +255,15 @@ ssovf_probe(struct rte_pci_driver *pci_drv, struct rte_pci_device *pci_dev)
 	res->domain = val & 0xffff;
 
 	sdev.total_ssovfs++;
+	if (!vfid) {
+		reg = octeontx_ssovf_bar(OCTEONTX_SSO_GROUP, 0, 0);
+		reg += SSO_VHGRP_PF_MBOX(1);
+		if (octeontx_mbox_set_reg(reg)) {
+			mbox_log_err("Invalid Failed to set mbox_reg");
+			return -EINVAL;
+		}
+	}
+
 	rte_wmb();
 	mbox_log_dbg("Domain=%d group=%d total_ssovfs=%d", res->domain,
 			res->vfid, sdev.total_ssovfs);
diff --git a/drivers/mempool/octeontx/Makefile b/drivers/mempool/octeontx/Makefile
index dfc373e62..7d12094bb 100644
--- a/drivers/mempool/octeontx/Makefile
+++ b/drivers/mempool/octeontx/Makefile
@@ -10,6 +10,7 @@ include $(RTE_SDK)/mk/rte.vars.mk
 LIB = librte_mempool_octeontx.a
 
 CFLAGS += $(WERROR_FLAGS)
+CFLAGS += -I$(RTE_SDK)/drivers/common/octeontx/
 EXPORT_MAP := rte_mempool_octeontx_version.map
 
 LIBABIVER := 1
@@ -17,8 +18,6 @@ LIBABIVER := 1
 #
 # all source are stored in SRCS-y
 #
-SRCS-$(CONFIG_RTE_LIBRTE_OCTEONTX_MEMPOOL) += octeontx_ssovf.c
-SRCS-$(CONFIG_RTE_LIBRTE_OCTEONTX_MEMPOOL) += octeontx_mbox.c
 SRCS-$(CONFIG_RTE_LIBRTE_OCTEONTX_MEMPOOL) += octeontx_fpavf.c
 SRCS-$(CONFIG_RTE_LIBRTE_OCTEONTX_MEMPOOL) += rte_mempool_octeontx.c
 
@@ -36,6 +35,6 @@ CFLAGS_rte_mempool_octeontx.o += -Ofast
 endif
 
 LDLIBS += -lrte_eal -lrte_mempool -lrte_ring -lrte_mbuf
-LDLIBS += -lrte_bus_pci
+LDLIBS += -lrte_bus_pci -lrte_octeontx_common
 
 include $(RTE_SDK)/mk/rte.lib.mk
diff --git a/drivers/mempool/octeontx/meson.build b/drivers/mempool/octeontx/meson.build
index 1e894a56b..86c2ba104 100644
--- a/drivers/mempool/octeontx/meson.build
+++ b/drivers/mempool/octeontx/meson.build
@@ -1,10 +1,8 @@
 # SPDX-License-Identifier: BSD-3-Clause
 # Copyright(c) 2017 Cavium, Inc
 
-sources = files('octeontx_ssovf.c',
-		'octeontx_mbox.c',
-		'octeontx_fpavf.c',
+sources = files('octeontx_fpavf.c',
 		'rte_mempool_octeontx.c'
 )
 
-deps += ['mbuf', 'bus_pci']
+deps += ['mbuf', 'bus_pci', 'octeontx_common']
diff --git a/drivers/mempool/octeontx/octeontx_fpavf.c b/drivers/mempool/octeontx/octeontx_fpavf.c
index 61c72c7c8..85c361d20 100644
--- a/drivers/mempool/octeontx/octeontx_fpavf.c
+++ b/drivers/mempool/octeontx/octeontx_fpavf.c
@@ -115,10 +115,6 @@ otx_pool_init_log(void)
 	octeontx_logtype_fpavf = rte_log_register("pmd.mempool.octeontx");
 	if (octeontx_logtype_fpavf >= 0)
 		rte_log_set_level(octeontx_logtype_fpavf, RTE_LOG_NOTICE);
-
-	octeontx_logtype_fpavf_mbox = rte_log_register("pmd.mempool.octeontx.mbox");
-	if (octeontx_logtype_fpavf_mbox >= 0)
-		rte_log_set_level(octeontx_logtype_fpavf_mbox, RTE_LOG_NOTICE);
 }
 
 /* lock is taken by caller */
diff --git a/drivers/mempool/octeontx/octeontx_pool_logs.h b/drivers/mempool/octeontx/octeontx_pool_logs.h
index 958651924..7b4e1b387 100644
--- a/drivers/mempool/octeontx/octeontx_pool_logs.h
+++ b/drivers/mempool/octeontx/octeontx_pool_logs.h
@@ -11,21 +11,12 @@
 	rte_log(RTE_LOG_ ## level, octeontx_logtype_fpavf,\
 			"%s() line %u: " fmt "\n", __func__, __LINE__, ## args)
 
-#define MBOX_LOG(level, fmt, args...) \
-	rte_log(RTE_LOG_ ## level, octeontx_logtype_fpavf_mbox,\
-			"%s() line %u: " fmt "\n", __func__, __LINE__, ## args)
-
 #define fpavf_log_info(fmt, ...) FPAVF_LOG(INFO, fmt, ##__VA_ARGS__)
 #define fpavf_log_dbg(fmt, ...) FPAVF_LOG(DEBUG, fmt, ##__VA_ARGS__)
 #define fpavf_log_err(fmt, ...) FPAVF_LOG(ERR, fmt, ##__VA_ARGS__)
 #define fpavf_func_trace fpavf_log_dbg
 
-#define mbox_log_info(fmt, ...) MBOX_LOG(INFO, fmt, ##__VA_ARGS__)
-#define mbox_log_dbg(fmt, ...) MBOX_LOG(DEBUG, fmt, ##__VA_ARGS__)
-#define mbox_log_err(fmt, ...) MBOX_LOG(ERR, fmt, ##__VA_ARGS__)
-#define mbox_func_trace mbox_log_dbg
 
 extern int octeontx_logtype_fpavf;
-extern int octeontx_logtype_fpavf_mbox;
 
 #endif /* __OCTEONTX_POOL_LOGS_H__*/
diff --git a/drivers/mempool/octeontx/rte_mempool_octeontx_version.map b/drivers/mempool/octeontx/rte_mempool_octeontx_version.map
index fe8cdeca0..a75303172 100644
--- a/drivers/mempool/octeontx/rte_mempool_octeontx_version.map
+++ b/drivers/mempool/octeontx/rte_mempool_octeontx_version.map
@@ -1,9 +1,3 @@
 DPDK_17.11 {
-	global:
-
-	octeontx_ssovf_info;
-	octeontx_ssovf_bar;
-	octeontx_ssovf_mbox_send;
-
 	local: *;
 };
diff --git a/drivers/net/octeontx/Makefile b/drivers/net/octeontx/Makefile
index 3e4a10662..efe38c4ac 100644
--- a/drivers/net/octeontx/Makefile
+++ b/drivers/net/octeontx/Makefile
@@ -10,6 +10,7 @@ include $(RTE_SDK)/mk/rte.vars.mk
 LIB = librte_pmd_octeontx.a
 
 CFLAGS += $(WERROR_FLAGS)
+CFLAGS += -I$(RTE_SDK)/drivers/common/octeontx/
 CFLAGS += -I$(RTE_SDK)/drivers/mempool/octeontx/
 
 EXPORT_MAP := rte_pmd_octeontx_version.map
@@ -46,7 +47,7 @@ endif
 CFLAGS_octeontx_ethdev.o += -DALLOW_EXPERIMENTAL_API
 
 LDLIBS += -lrte_eal -lrte_mbuf -lrte_mempool -lrte_ring
-LDLIBS += -lrte_ethdev -lrte_net -lrte_kvargs
+LDLIBS += -lrte_ethdev -lrte_net -lrte_kvargs -lrte_octeontx_common
 LDLIBS += -lrte_mempool_octeontx
 LDLIBS += -lrte_eventdev
 LDLIBS += -lrte_bus_pci
diff --git a/mk/rte.app.mk b/mk/rte.app.mk
index 94525dc80..4bcc4bbf0 100644
--- a/mk/rte.app.mk
+++ b/mk/rte.app.mk
@@ -223,6 +223,10 @@ endif # CONFIG_RTE_LIBRTE_DPAA_BUS
 
 endif # CONFIG_RTE_LIBRTE_CRYPTODEV
 
+ifeq ($(CONFIG_RTE_LIBRTE_PMD_OCTEONTX_SSOVF)$(CONFIG_RTE_LIBRTE_OCTEONTX_MEMPOOL),yy)
+_LDLIBS-y += -lrte_octeontx_common
+endif
+
 ifeq ($(CONFIG_RTE_LIBRTE_EVENTDEV),y)
 _LDLIBS-$(CONFIG_RTE_LIBRTE_PMD_SKELETON_EVENTDEV) += -lrte_pmd_skeleton_event
 _LDLIBS-$(CONFIG_RTE_LIBRTE_PMD_SW_EVENTDEV) += -lrte_pmd_sw_event
-- 
2.16.2



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