[PATCHv6,4/5] linux-generic: add ipc pktio support

Message ID 1432222332-21289-5-git-send-email-maxim.uvarov@linaro.org
State New
Headers show

Commit Message

Maxim Uvarov May 21, 2015, 3:32 p.m.
Signed-off-by: Maxim Uvarov <maxim.uvarov@linaro.org>
---
 helper/include/odp/helper/ring.h                   |   7 +-
 helper/ring.c                                      |   3 +-
 platform/linux-generic/Makefile.am                 |   3 +
 .../linux-generic/include/odp_buffer_internal.h    |   3 +
 .../linux-generic/include/odp_packet_io_internal.h |  30 ++
 .../include/odp_packet_io_ipc_internal.h           |  51 ++
 platform/linux-generic/include/odp_shm_internal.h  |  20 +
 platform/linux-generic/odp_packet_io.c             |  19 +-
 platform/linux-generic/odp_packet_io_ipc.c         | 594 +++++++++++++++++++++
 platform/linux-generic/odp_pool.c                  |  20 +-
 platform/linux-generic/odp_shared_memory.c         |  10 +-
 11 files changed, 749 insertions(+), 11 deletions(-)
 create mode 100644 platform/linux-generic/include/odp_packet_io_ipc_internal.h
 create mode 100644 platform/linux-generic/include/odp_shm_internal.h
 create mode 100644 platform/linux-generic/odp_packet_io_ipc.c

Patch

diff --git a/helper/include/odp/helper/ring.h b/helper/include/odp/helper/ring.h
index 5e640a7..c3c2f6a 100644
--- a/helper/include/odp/helper/ring.h
+++ b/helper/include/odp/helper/ring.h
@@ -156,10 +156,11 @@  typedef struct odph_ring {
 } odph_ring_t;
 
 
-#define ODPH_RING_F_SP_ENQ 0x0001 /* The default enqueue is "single-producer".*/
-#define ODPH_RING_F_SC_DEQ 0x0002 /* The default dequeue is "single-consumer".*/
-#define ODPH_RING_SHM_PROC 0x0004 /* If set - ring is visible from different
+#define ODPH_RING_F_SP_ENQ (1 << 0) /* The default enqueue is "single-producer".*/
+#define ODPH_RING_F_SC_DEQ (1 << 1) /* The default dequeue is "single-consumer".*/
+#define ODPH_RING_SHM_PROC (1 << 2) /* If set - ring is visible from different
 				    processes. Default is thread visible.     */
+#define ODPH_RING_NO_LIST  (1 << 3) /* Do not link ring to linked list. */
 #define ODPH_RING_QUOT_EXCEED (1 << 31)  /* Quota exceed for burst ops */
 #define ODPH_RING_SZ_MASK  (unsigned)(0x0fffffff) /* Ring size mask */
 
diff --git a/helper/ring.c b/helper/ring.c
index 4224518..7de3d8a 100644
--- a/helper/ring.c
+++ b/helper/ring.c
@@ -199,7 +199,8 @@  odph_ring_create(const char *name, unsigned count, unsigned flags)
 		r->prod.tail = 0;
 		r->cons.tail = 0;
 
-		TAILQ_INSERT_TAIL(&odp_ring_list, r, next);
+		if (!(flags & ODPH_RING_NO_LIST))
+			TAILQ_INSERT_TAIL(&odp_ring_list, r, next);
 	} else {
 		ODP_ERR("Cannot reserve memory\n");
 	}
diff --git a/platform/linux-generic/Makefile.am b/platform/linux-generic/Makefile.am
index 66f0474..4843386 100644
--- a/platform/linux-generic/Makefile.am
+++ b/platform/linux-generic/Makefile.am
@@ -120,11 +120,13 @@  noinst_HEADERS = \
 		  ${top_srcdir}/platform/linux-generic/include/odp_internal.h \
 		  ${top_srcdir}/platform/linux-generic/include/odp_packet_internal.h \
 		  ${top_srcdir}/platform/linux-generic/include/odp_packet_io_internal.h \
+		  ${top_srcdir}/platform/linux-generic/include/odp_packet_io_ipc_internal.h \
 		  ${top_srcdir}/platform/linux-generic/include/odp_packet_io_queue.h \
 		  ${top_srcdir}/platform/linux-generic/include/odp_packet_socket.h \
 		  ${top_srcdir}/platform/linux-generic/include/odp_pool_internal.h \
 		  ${top_srcdir}/platform/linux-generic/include/odp_queue_internal.h \
 		  ${top_srcdir}/platform/linux-generic/include/odp_schedule_internal.h \
+		  ${top_srcdir}/platform/linux-generic/include/odp_shm_internal.h \
 		  ${top_srcdir}/platform/linux-generic/include/odp_spin_internal.h \
 		  ${top_srcdir}/platform/linux-generic/include/odp_timer_internal.h \
 		  ${top_srcdir}/platform/linux-generic/Makefile.inc
@@ -155,6 +157,7 @@  __LIB__libodp_la_SOURCES = \
 			   odp_packet.c \
 			   odp_packet_flags.c \
 			   odp_packet_io.c \
+			   odp_packet_io_ipc.c \
 			   odp_packet_socket.c \
 			   odp_pool.c \
 			   odp_queue.c \
diff --git a/platform/linux-generic/include/odp_buffer_internal.h b/platform/linux-generic/include/odp_buffer_internal.h
index e7b7568..bfeea2c 100644
--- a/platform/linux-generic/include/odp_buffer_internal.h
+++ b/platform/linux-generic/include/odp_buffer_internal.h
@@ -129,6 +129,9 @@  typedef struct odp_buffer_hdr_t {
 	uint32_t                 uarea_size; /* size of user area */
 	uint32_t                 segcount;   /* segment count */
 	uint32_t                 segsize;    /* segment size */
+	/* ipc mapped process can not walk over pointers,
+	 * offset has to be used */
+	uint64_t		 ipc_addr_offset[ODP_BUFFER_MAX_SEG];
 	void                    *addr[ODP_BUFFER_MAX_SEG]; /* block addrs */
 } odp_buffer_hdr_t;
 
diff --git a/platform/linux-generic/include/odp_packet_io_internal.h b/platform/linux-generic/include/odp_packet_io_internal.h
index 18b59ef..33fa111 100644
--- a/platform/linux-generic/include/odp_packet_io_internal.h
+++ b/platform/linux-generic/include/odp_packet_io_internal.h
@@ -23,6 +23,7 @@  extern "C" {
 #include <odp_classification_datamodel.h>
 #include <odp_align_internal.h>
 #include <odp_debug_internal.h>
+#include <odp/helper/ring.h>
 
 #include <odp/config.h>
 #include <odp/hints.h>
@@ -36,8 +37,36 @@  typedef enum {
 	ODP_PKTIO_TYPE_SOCKET_MMSG,
 	ODP_PKTIO_TYPE_SOCKET_MMAP,
 	ODP_PKTIO_TYPE_LOOPBACK,
+	ODP_PKTIO_TYPE_IPC,
+	ODP_PKTIO_TYPE_IPC_SLAVE,
 } odp_pktio_type_t;
 
+typedef	struct {
+	/* TX */
+	struct  {
+		odph_ring_t	*prod; /**< ODP ring for IPC msg packets
+					  indexes transmitted to shared
+					  memory */
+		odph_ring_t	*cons; /**< ODP ring for IPC msg packets
+					    indexes already processed by remote
+					    process */
+	} m; /* master */
+	/* RX */
+	struct {
+		odph_ring_t	*prod; /**< ODP ring for IPC msg packets
+					    indexes recieved from shared
+					     memory (from remote process) */
+		odph_ring_t	*cons; /**< ODP ring for IPC msg packets
+					    indexes already processed by
+					    current process */
+	} s; /* slave */
+	void		*pool_base;		/**< Remote pool base addr */
+	void		*pool_mdata_base;	/**< Remote pool mdata base addr */
+	uint64_t	pkt_size;		/**< Packet size in remote pool */
+	odp_pool_t	pool;			/**< Pool of main process */
+	odp_shm_t	pool_shm;		/**< Shm memory for remote pool */
+} _ipc_pktio_t;
+
 struct pktio_entry {
 	odp_spinlock_t lock;		/**< entry spinlock */
 	int taken;			/**< is entry taken(1) or free(0) */
@@ -53,6 +82,7 @@  struct pktio_entry {
 	char name[IFNAMSIZ];		/**< name of pktio provided to
 					   pktio_open() */
 	odp_bool_t promisc;		/**< promiscuous mode state */
+	_ipc_pktio_t ipc;		/**< IPC pktio data */
 };
 
 typedef union {
diff --git a/platform/linux-generic/include/odp_packet_io_ipc_internal.h b/platform/linux-generic/include/odp_packet_io_ipc_internal.h
new file mode 100644
index 0000000..660ee7d
--- /dev/null
+++ b/platform/linux-generic/include/odp_packet_io_ipc_internal.h
@@ -0,0 +1,51 @@ 
+/* Copyright (c) 2015, Linaro Limited
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier:     BSD-3-Clause
+ */
+
+#include <odp/packet_io.h>
+#include <odp_packet_io_internal.h>
+#include <odp/packet.h>
+#include <odp_packet_internal.h>
+#include <odp_internal.h>
+#include <odp/shared_memory.h>
+
+#include <string.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+/* IPC packet I/O over odph_ring */
+#include <odp/helper/ring.h>
+
+#define PKTIO_IPC_ENTRIES     4096 /**< number of odp buffers in
+					odp ring queue */
+
+/* that struct is exported to shared memory, so that 2 processes can find
+ * each other.
+ */
+struct pktio_info {
+	char remote_pool_name[ODP_POOL_NAME_LEN];
+	int shm_pool_bufs_num;	/*< number of buffer in remote pool */
+	size_t shm_pkt_pool_size; /*< size of remote pool */
+	uint32_t shm_pkt_size; /*< size of packet/segment in remote pool */
+	odp_shm_t shm;	/*< current structure stored in this shm */
+	size_t mdata_offset; /*< offset from shared memory block start
+			      *to pool_mdata_addr
+			      * (linux-generic pool specific) */
+	struct {
+		size_t mdata_offset; /*< offset from shared memory block start
+				      * to pool_mdata_addr in remote process.
+				      * (linux-generic pool specific) */
+		char   pool_name[ODP_POOL_NAME_LEN];
+	} slave;
+} __packed;
+
+int ipc_pktio_init(pktio_entry_t *pktio_entry, const char *dev,
+		   odp_pool_t pool);
+
+int ipc_pktio_recv(pktio_entry_t *pktio_entry, odp_packet_t pkt_table[],
+		   unsigned len);
+
+int ipc_pktio_send(pktio_entry_t *pktio_entry, odp_packet_t pkt_table[],
+		   unsigned len);
diff --git a/platform/linux-generic/include/odp_shm_internal.h b/platform/linux-generic/include/odp_shm_internal.h
new file mode 100644
index 0000000..f3ce892
--- /dev/null
+++ b/platform/linux-generic/include/odp_shm_internal.h
@@ -0,0 +1,20 @@ 
+/* Copyright (c) 2013, Linaro Limited
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier:     BSD-3-Clause
+ */
+
+#ifndef ODP_SHM_INTERNAL_H_
+#define ODP_SHM_INTERNAL_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define _ODP_SHM_PROC_NOCREAT 0x4  /**< Do not create shm if not exist */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/platform/linux-generic/odp_packet_io.c b/platform/linux-generic/odp_packet_io.c
index 5ae24b9..2bd6427 100644
--- a/platform/linux-generic/odp_packet_io.c
+++ b/platform/linux-generic/odp_packet_io.c
@@ -18,6 +18,7 @@ 
 #include <odp_schedule_internal.h>
 #include <odp_classification_internal.h>
 #include <odp_debug_internal.h>
+#include <odp_packet_io_ipc_internal.h>
 
 #include <string.h>
 #include <sys/ioctl.h>
@@ -25,6 +26,9 @@ 
 #include <ifaddrs.h>
 #include <errno.h>
 
+#include <sys/types.h>
+#include <unistd.h>
+
 /* MTU to be reported for the "loop" interface */
 #define PKTIO_LOOP_MTU 1500
 /* MAC address for the "loop" interface */
@@ -265,7 +269,12 @@  static odp_pktio_t setup_pktio_entry(const char *dev, odp_pool_t pool)
 
 	if (strcmp(dev, "loop") == 0)
 		ret = init_loop(pktio_entry, id);
-	else
+	else if (!strncmp(dev, "ipc", 3)) {
+		ret = ipc_pktio_init(pktio_entry, dev, pool);
+		if (ret != 0)
+			ODP_ABORT("unable to init ipc for %s, pool %" PRIu64 "\n",
+				  dev, pool);
+	} else
 		ret = init_socket(pktio_entry, dev, pool);
 
 	if (ret != 0) {
@@ -410,6 +419,10 @@  int odp_pktio_recv(odp_pktio_t id, odp_packet_t pkt_table[], int len)
 	case ODP_PKTIO_TYPE_LOOPBACK:
 		pkts = deq_loopback(pktio_entry, pkt_table, len);
 		break;
+	case ODP_PKTIO_TYPE_IPC_SLAVE:
+	case ODP_PKTIO_TYPE_IPC:
+		pkts = ipc_pktio_recv(pktio_entry, pkt_table, len);
+		break;
 	default:
 		pkts = -1;
 		break;
@@ -464,6 +477,10 @@  int odp_pktio_send(odp_pktio_t id, odp_packet_t pkt_table[], int len)
 	case ODP_PKTIO_TYPE_LOOPBACK:
 		pkts = enq_loopback(pktio_entry, pkt_table, len);
 		break;
+	case ODP_PKTIO_TYPE_IPC:
+	case ODP_PKTIO_TYPE_IPC_SLAVE:
+		pkts = ipc_pktio_send(pktio_entry, pkt_table, len);
+		break;
 	default:
 		pkts = -1;
 	}
diff --git a/platform/linux-generic/odp_packet_io_ipc.c b/platform/linux-generic/odp_packet_io_ipc.c
new file mode 100644
index 0000000..46e0e3c
--- /dev/null
+++ b/platform/linux-generic/odp_packet_io_ipc.c
@@ -0,0 +1,594 @@ 
+/* Copyright (c) 2015, Linaro Limited
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier:     BSD-3-Clause
+ */
+
+#include <odp_packet_io_ipc_internal.h>
+#include <odp_debug_internal.h>
+#include <odp_packet_io_internal.h>
+#include <odp_spin_internal.h>
+#include <odp/system_info.h>
+#include <odp_shm_internal.h>
+
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+static void *_ipc_map_remote_pool(const char *name, size_t size);
+
+static const char *_ipc_odp_buffer_pool_shm_name(odp_pool_t pool_hdl)
+{
+	pool_entry_t *pool;
+	uint32_t pool_id;
+	odp_shm_t shm;
+	odp_shm_info_t info;
+
+	pool_id = pool_handle_to_index(pool_hdl);
+	pool    = get_pool_entry(pool_id);
+	shm = pool->s.pool_shm;
+
+	odp_shm_info(shm, &info);
+
+	return info.name;
+}
+
+/**
+* Look up for shared memory object.
+*
+* @param name   name of shm object
+*
+* @return 0 on success, otherwise non-zero
+*/
+static int _odp_shm_lookup_ipc(const char *name)
+{
+	int shm;
+
+	shm = shm_open(name, O_RDWR, S_IRUSR | S_IWUSR);
+	if (shm == -1) {
+		if (errno == ENOENT)
+			return -1;
+		ODP_ABORT("shm_open for %s err %s\n",
+			  name, strerror(errno));
+	}
+	close(shm);
+	return 0;
+}
+
+static struct pktio_info *_ipc_map_pool_info(pktio_entry_t *pktio_entry,
+					     const char *pool_name,
+					     int flag)
+{
+	struct pktio_info *pinfo;
+	char name[ODP_POOL_NAME_LEN + sizeof("_info")];
+
+	/* Create info about remote pktio */
+	snprintf(name, sizeof(name), "%s_info", pool_name);
+	odp_shm_t shm = odp_shm_reserve(name, sizeof(struct pktio_info),
+			ODP_CACHE_LINE_SIZE,
+			flag);
+	if (ODP_SHM_INVALID == shm)
+		ODP_ABORT("unable to reserve memory for shm info");
+	pinfo = odp_shm_addr(shm);
+	if (flag != _ODP_SHM_PROC_NOCREAT)
+		pinfo->remote_pool_name[0] = 0;
+
+	pktio_entry->s.ipc.pool_shm = shm;
+	return pinfo;
+}
+
+static int _ipc_pktio_init_master(pktio_entry_t *pktio_entry, const char *dev,
+				  odp_pool_t pool)
+{
+	char ipc_shm_name[ODP_POOL_NAME_LEN + sizeof("_slave_r")];
+	pool_entry_t *pool_entry;
+	uint32_t pool_id;
+	void *ipc_pool_base;
+	struct pktio_info *pinfo;
+	const char *pool_name;
+	odp_shm_t shm;
+
+	pool_id = pool_handle_to_index(pool);
+	pool_entry    = get_pool_entry(pool_id);
+
+	if (ODP_POOL_NAME_LEN != ODPH_RING_NAMESIZE)
+		ODP_ABORT("");
+
+	if (strlen(dev) > (ODP_POOL_NAME_LEN - sizeof("_slave_r"))) {
+		ODP_DBG("too big ipc name\n");
+		return -1;
+	}
+
+	/* generate name in shm like ipc_pktio_r for
+	 * to be processed packets ring.
+	 */
+	snprintf(ipc_shm_name, sizeof(ipc_shm_name), "%s_m_prod", dev);
+	pktio_entry->s.ipc.m.prod = odph_ring_create(ipc_shm_name,
+			PKTIO_IPC_ENTRIES,
+			ODPH_RING_SHM_PROC | ODPH_RING_NO_LIST);
+	if (!pktio_entry->s.ipc.m.prod) {
+		ODP_DBG("pid %d unable to create ipc ring %s name\n",
+			getpid(), ipc_shm_name);
+		return -1;
+	}
+	ODP_DBG("Created IPC ring: %s, count %d, free %d\n",
+		ipc_shm_name, odph_ring_count(pktio_entry->s.ipc.m.prod),
+		odph_ring_free_count(pktio_entry->s.ipc.m.prod));
+
+	/* generate name in shm like ipc_pktio_p for
+	 * already processed packets
+	 */
+	snprintf(ipc_shm_name, sizeof(ipc_shm_name), "%s_m_cons", dev);
+	pktio_entry->s.ipc.m.cons = odph_ring_create(ipc_shm_name,
+			PKTIO_IPC_ENTRIES,
+			ODPH_RING_SHM_PROC | ODPH_RING_NO_LIST);
+	if (!pktio_entry->s.ipc.m.cons) {
+		ODP_DBG("pid %d unable to create ipc ring %s name\n",
+			getpid(), ipc_shm_name);
+		goto free_m_prod;
+	}
+	ODP_DBG("Created IPC ring: %s, count %d, free %d\n",
+		ipc_shm_name, odph_ring_count(pktio_entry->s.ipc.m.cons),
+		odph_ring_free_count(pktio_entry->s.ipc.m.cons));
+
+	snprintf(ipc_shm_name, sizeof(ipc_shm_name), "%s_s_prod", dev);
+	pktio_entry->s.ipc.s.prod = odph_ring_create(ipc_shm_name,
+			PKTIO_IPC_ENTRIES,
+			ODPH_RING_SHM_PROC | ODPH_RING_NO_LIST);
+	if (!pktio_entry->s.ipc.s.prod) {
+		ODP_DBG("pid %d unable to create ipc ring %s name\n",
+			getpid(), ipc_shm_name);
+		goto free_m_cons;
+	}
+	ODP_DBG("Created IPC ring: %s, count %d, free %d\n",
+		ipc_shm_name, odph_ring_count(pktio_entry->s.ipc.s.prod),
+		odph_ring_free_count(pktio_entry->s.ipc.s.prod));
+
+	snprintf(ipc_shm_name, sizeof(ipc_shm_name), "%s_s_cons", dev);
+	pktio_entry->s.ipc.s.cons = odph_ring_create(ipc_shm_name,
+			PKTIO_IPC_ENTRIES,
+			ODPH_RING_SHM_PROC | ODPH_RING_NO_LIST);
+	if (!pktio_entry->s.ipc.s.cons) {
+		ODP_DBG("pid %d unable to create ipc ring %s name\n",
+			getpid(), ipc_shm_name);
+		goto free_s_prod;
+	}
+	ODP_DBG("Created IPC ring: %s, count %d, free %d\n",
+		ipc_shm_name, odph_ring_count(pktio_entry->s.ipc.s.cons),
+		odph_ring_free_count(pktio_entry->s.ipc.s.cons));
+
+	/* Memory to store information about exported pool */
+	pinfo = _ipc_map_pool_info(pktio_entry, dev, ODP_SHM_PROC);
+
+	/* Set up pool name for remote info */
+	pool_name = _ipc_odp_buffer_pool_shm_name(pool);
+	memcpy(pinfo->remote_pool_name, pool_name, strlen(pool_name));
+	pinfo->shm_pkt_pool_size = pool_entry->s.pool_size;
+	pinfo->shm_pool_bufs_num = pool_entry->s.buf_num;
+	pinfo->shm_pkt_size = pool_entry->s.seg_size;
+	pinfo->mdata_offset =  pool_entry->s.pool_mdata_addr -
+			       pool_entry->s.pool_base_addr;
+	pinfo->slave.mdata_offset = 0;
+	ODP_DBG("Master waiting for slave to be connected now..\n");
+
+	/* Wait for remote process to export his pool. */
+	ODP_DBG("Wait for second process set mdata_offset...\n");
+	while (pinfo->slave.mdata_offset == 0)
+		odp_spin();
+
+	ODP_DBG("Wait for second process set mdata_offset... DONE.\n");
+
+	while (1) {
+		int ret;
+
+		ret = _odp_shm_lookup_ipc(pinfo->slave.pool_name);
+		if (!ret)
+			break;
+		ODP_DBG("Master looking for %s\n", pinfo->slave.pool_name);
+		sleep(1);
+	}
+
+	ipc_pool_base = _ipc_map_remote_pool(pinfo->slave.pool_name,
+					     pinfo->shm_pkt_pool_size);
+	pktio_entry->s.ipc.pool_mdata_base = (char *)ipc_pool_base +
+					     pinfo->slave.mdata_offset;
+	pktio_entry->s.ipc.pool = pool;
+
+	return 0;
+
+free_s_prod:
+	snprintf(ipc_shm_name, sizeof(ipc_shm_name), "%s_s_prod", dev);
+	shm = odp_shm_lookup(ipc_shm_name);
+	odp_shm_free(shm);
+free_m_cons:
+	snprintf(ipc_shm_name, sizeof(ipc_shm_name), "%s_m_cons", dev);
+	shm = odp_shm_lookup(ipc_shm_name);
+	odp_shm_free(shm);
+free_m_prod:
+	snprintf(ipc_shm_name, sizeof(ipc_shm_name), "%s_m_prod", dev);
+	shm = odp_shm_lookup(ipc_shm_name);
+	odp_shm_free(shm);
+	return -1;
+}
+
+static odp_pool_t _ipc_odp_alloc_and_create_pool_slave(struct pktio_info *pinfo)
+{
+	odp_pool_t pool;
+	char *pool_name;
+	odp_pool_param_t params;
+	int num = pinfo->shm_pool_bufs_num;
+	uint32_t buf_size = pinfo->shm_pkt_size;
+	pool_entry_t *pool_entry;
+
+	pool_name = calloc(1, strlen(pinfo->remote_pool_name) +
+			   sizeof("ipc_pool_slave_"));
+	sprintf(pool_name, "ipc_pool_slave_%s", pinfo->remote_pool_name);
+
+	ODP_DBG("slave uses pool %s\n", pool_name);
+
+	memset(&params, 0, sizeof(params));
+	params.pkt.num = num;
+	params.pkt.len = buf_size;
+	params.pkt.seg_len = buf_size;
+	params.type = ODP_POOL_PACKET;
+
+	pool = odp_pool_create(pool_name, ODP_SHM_NULL, &params);
+	if (pool == ODP_POOL_INVALID)
+		ODP_ABORT("Error: packet pool create failed.\n"
+			"num %d, len %d, seg_len %d\n",
+			params.pkt.num, params.pkt.len, params.pkt.seg_len);
+
+	/* Export info so that master can connect to that pool*/
+	snprintf(pinfo->slave.pool_name, 30, "%s", pool_name);
+	pool_entry = odp_pool_to_entry(pool);
+	pinfo->slave.mdata_offset = pool_entry->s.pool_mdata_addr -
+				    pool_entry->s.pool_base_addr;
+	free(pool_name);
+
+	return pool;
+}
+
+static void *_ipc_map_remote_pool(const char *name, size_t size)
+{
+	odp_shm_t shm;
+
+	ODP_DBG("Mapping remote pool %s, size %ld\n", name, size);
+	shm = odp_shm_reserve(name,
+			      size,
+			      ODP_CACHE_LINE_SIZE,
+			      _ODP_SHM_PROC_NOCREAT);
+	if (shm == ODP_SHM_INVALID)
+		ODP_ABORT("unable map %s\n", name);
+	return odp_shm_addr(shm);
+}
+
+static void *_ipc_shm_map(char *name, size_t size, int timeout)
+{
+	odp_shm_t shm;
+	int ret;
+
+	while (1) {
+		ret = _odp_shm_lookup_ipc(name);
+		if (!ret)
+			break;
+		ODP_DBG("Waiting for %s\n", name);
+		if (timeout <= 0)
+			return NULL;
+		timeout--;
+		sleep(1);
+	}
+
+	shm = odp_shm_reserve(name, size,
+			      ODP_CACHE_LINE_SIZE,
+			      _ODP_SHM_PROC_NOCREAT);
+	if (ODP_SHM_INVALID == shm)
+		ODP_ABORT("unable to map: %s\n", name);
+
+	return odp_shm_addr(shm);
+}
+
+static int _ipc_pktio_init_slave(const char *dev, pktio_entry_t *pktio_entry)
+{
+	char ipc_shm_name[ODP_POOL_NAME_LEN + sizeof("_slave_r")];
+	size_t ring_size = PKTIO_IPC_ENTRIES * sizeof(void *) +
+			   sizeof(odph_ring_t);
+	struct pktio_info *pinfo;
+	void *ipc_pool_base;
+	odp_shm_t shm;
+
+	if (ODP_POOL_NAME_LEN != ODPH_RING_NAMESIZE)
+		ODP_ABORT("");
+
+	if (strlen(dev) > (ODP_POOL_NAME_LEN - sizeof("_slave_r"))) {
+		ODP_DBG("too big ipc name\n");
+		return -1;
+	}
+
+	snprintf(ipc_shm_name, sizeof(ipc_shm_name), "%s_m_prod", dev);
+	pktio_entry->s.ipc.m.prod  = _ipc_shm_map(ipc_shm_name, ring_size, 10);
+	if (!pktio_entry->s.ipc.m.prod) {
+		ODP_DBG("pid %d unable to find ipc ring %s name\n",
+			getpid(), dev);
+		return -1;
+	}
+	ODP_DBG("Connected IPC ring: %s, count %d, free %d\n",
+		ipc_shm_name, odph_ring_count(pktio_entry->s.ipc.m.prod),
+		odph_ring_free_count(pktio_entry->s.ipc.m.prod));
+
+	snprintf(ipc_shm_name, sizeof(ipc_shm_name), "%s_m_cons", dev);
+	pktio_entry->s.ipc.m.cons = _ipc_shm_map(ipc_shm_name, ring_size, 10);
+	if (!pktio_entry->s.ipc.m.cons) {
+		ODP_DBG("pid %d unable to find ipc ring %s name\n",
+			getpid(), dev);
+		goto free_m_prod;
+	}
+	ODP_DBG("Connected IPC ring: %s, count %d, free %d\n",
+		ipc_shm_name, odph_ring_count(pktio_entry->s.ipc.m.cons),
+		odph_ring_free_count(pktio_entry->s.ipc.m.cons));
+
+	snprintf(ipc_shm_name, sizeof(ipc_shm_name), "%s_s_prod", dev);
+	pktio_entry->s.ipc.s.prod = _ipc_shm_map(ipc_shm_name, ring_size, 10);
+	if (!pktio_entry->s.ipc.s.prod) {
+		ODP_DBG("pid %d unable to find ipc ring %s name\n",
+			getpid(), dev);
+		goto free_m_cons;
+	}
+	ODP_DBG("Connected IPC ring: %s, count %d, free %d\n",
+		ipc_shm_name, odph_ring_count(pktio_entry->s.ipc.s.prod),
+		odph_ring_free_count(pktio_entry->s.ipc.s.prod));
+
+	snprintf(ipc_shm_name, sizeof(ipc_shm_name), "%s_s_cons", dev);
+	pktio_entry->s.ipc.s.cons = _ipc_shm_map(ipc_shm_name, ring_size, 10);
+	if (!pktio_entry->s.ipc.s.cons) {
+		ODP_DBG("pid %d unable to find ipc ring %s name\n",
+			getpid(), dev);
+		goto free_s_prod;
+	}
+	ODP_DBG("Connected IPC ring: %s, count %d, free %d\n",
+		ipc_shm_name, odph_ring_count(pktio_entry->s.ipc.s.cons),
+		odph_ring_free_count(pktio_entry->s.ipc.s.cons));
+
+	/* Get info about remote pool */
+	pinfo = _ipc_map_pool_info(pktio_entry, dev, _ODP_SHM_PROC_NOCREAT);
+
+	ipc_pool_base = _ipc_map_remote_pool(pinfo->remote_pool_name,
+					     pinfo->shm_pkt_pool_size);
+	pktio_entry->s.ipc.pool_mdata_base = (char *)ipc_pool_base +
+					     pinfo->mdata_offset;
+	pktio_entry->s.ipc.pkt_size = pinfo->shm_pkt_size;
+
+	/* @todo: to simplify in linux-generic implementation we create pool for
+	 * packets from IPC queue. On receive implementation copies packets to
+	 * that pool. Later we can try to reuse original pool without packets
+	 * copying.
+	 */
+	pktio_entry->s.ipc.pool = _ipc_odp_alloc_and_create_pool_slave(pinfo);
+	ODP_DBG("%s OK.\n", __func__);
+	return 0;
+
+free_s_prod:
+	snprintf(ipc_shm_name, sizeof(ipc_shm_name), "%s_s_prod", dev);
+	shm = odp_shm_lookup(ipc_shm_name);
+	odp_shm_free(shm);
+free_m_cons:
+	snprintf(ipc_shm_name, sizeof(ipc_shm_name), "%s_m_cons", dev);
+	shm = odp_shm_lookup(ipc_shm_name);
+	odp_shm_free(shm);
+free_m_prod:
+	snprintf(ipc_shm_name, sizeof(ipc_shm_name), "%s_m_prod", dev);
+	shm = odp_shm_lookup(ipc_shm_name);
+	odp_shm_free(shm);
+	return -1;
+}
+
+int ipc_pktio_init(pktio_entry_t *pktio_entry, const char *dev,
+		   odp_pool_t pool)
+{
+	int ret;
+
+	/* if pool is zero we assume that it's slave process connects
+	 * to shared memory already created by main process.
+	 */
+	if (ODP_POOL_INVALID != pool) {
+		pktio_entry->s.type = ODP_PKTIO_TYPE_IPC;
+		ret = _ipc_pktio_init_master(pktio_entry, dev, pool);
+	} else {
+		pktio_entry->s.type = ODP_PKTIO_TYPE_IPC_SLAVE;
+		ret = _ipc_pktio_init_slave(dev, pktio_entry);
+	}
+
+	return ret;
+}
+
+static inline void *_ipc_buffer_map(odp_buffer_hdr_t *buf,
+				    uint32_t offset,
+				    uint32_t *seglen,
+				    uint32_t limit)
+{
+	int seg_index  = offset / buf->segsize;
+	int seg_offset = offset % buf->segsize;
+	void *addr = (char *)buf - buf->ipc_addr_offset[seg_index];
+
+	if (seglen) {
+		uint32_t buf_left = limit - offset;
+		*seglen = seg_offset + buf_left <= buf->segsize ?
+			buf_left : buf->segsize - seg_offset;
+	}
+
+	return (void *)(seg_offset + (uint8_t *)addr);
+}
+
+static inline void *_ipc_packet_map(odp_packet_hdr_t *pkt_hdr,
+				    uint32_t offset, uint32_t *seglen)
+{
+	if (offset > pkt_hdr->frame_len)
+		return NULL;
+
+	return _ipc_buffer_map(&pkt_hdr->buf_hdr,
+			  pkt_hdr->headroom + offset, seglen,
+			  pkt_hdr->headroom + pkt_hdr->frame_len);
+}
+
+int ipc_pktio_recv(pktio_entry_t *pktio_entry,
+		   odp_packet_t pkt_table[], unsigned len)
+{
+	int pkts = 0;
+	int i;
+	odph_ring_t *r;
+	odph_ring_t *r_p;
+	odp_packet_t remote_pkts[PKTIO_IPC_ENTRIES];
+	void **ipcbufs_p = (void *)&remote_pkts;
+
+	if (pktio_entry->s.type == ODP_PKTIO_TYPE_IPC) {
+		r = pktio_entry->s.ipc.s.prod;
+		r_p = pktio_entry->s.ipc.s.cons;
+	} else if (pktio_entry->s.type == ODP_PKTIO_TYPE_IPC_SLAVE) {
+		r = pktio_entry->s.ipc.m.prod;
+		r_p = pktio_entry->s.ipc.m.cons;
+	} else {
+		ODP_ABORT("wrong type: %d\n", pktio_entry->s.type);
+	}
+
+	pkts = odph_ring_mc_dequeue_burst(r, ipcbufs_p, len);
+	if (odp_unlikely(pkts < 0))
+		ODP_ABORT("error to dequeue no packets\n");
+
+	/* fast path */
+	if (odp_likely(0 == pkts))
+		return 0;
+
+	for (i = 0; i < pkts; i++) {
+		odp_pool_t pool;
+		odp_packet_t pkt;
+		odp_packet_hdr_t *phdr;
+		odp_buffer_bits_t handle;
+		int idx; /* Remote packet has coded pool and index.
+			  * We need only index.*/
+		void *pkt_data;
+		void *remote_pkt_data;
+
+		handle.handle = _odp_packet_to_buffer(remote_pkts[i]);
+		idx = handle.index;
+
+		/* Link to packed data. To this line we have Zero-Copy between
+		 * processes, to simplify use packet copy in that version which
+		 * can be removed later with more advance buffer management
+		 * (ref counters).
+		 */
+		/* reverse odp_buf_to_hdr() */
+		phdr = (odp_packet_hdr_t *)(
+				(char *)pktio_entry->s.ipc.pool_mdata_base +
+				(idx * ODP_CACHE_LINE_SIZE));
+
+		/* Allocate new packet. Select*/
+		pool = pktio_entry->s.ipc.pool;
+		if (odp_unlikely(pool == ODP_POOL_INVALID))
+			ODP_ABORT("invalid pool");
+
+		pkt = odp_packet_alloc(pool, phdr->frame_len);
+		if (odp_unlikely(pkt == ODP_PACKET_INVALID)) {
+			/* Original pool might be smaller then
+			*  PKTIO_IPC_ENTRIES. If packet can not be
+			 * allocated from pool at this time,
+			 * simple get in on next recv() call.
+			 */
+			pkts = i - 1;
+			break;
+		}
+
+		/* Copy packet data. */
+		pkt_data = odp_packet_data(pkt);
+		if (odp_unlikely(!pkt_data))
+			ODP_ABORT("unable to map pkt_data ipc_slave %d\n",
+				  (ODP_PKTIO_TYPE_IPC_SLAVE ==
+					pktio_entry->s.type));
+
+		remote_pkt_data =  _ipc_packet_map(phdr, 0, NULL);
+		if (odp_unlikely(!remote_pkt_data))
+			ODP_ABORT("unable to map remote_pkt_data, ipc_slave %d\n",
+				  (ODP_PKTIO_TYPE_IPC_SLAVE ==
+					pktio_entry->s.type));
+
+		/* @todo fix copy packet!!! */
+		memcpy(pkt_data, remote_pkt_data, phdr->frame_len);
+
+		/* Copy packets L2, L3 parsed offsets and size */
+		copy_packet_parser_metadata(phdr, odp_packet_hdr(pkt));
+
+		odp_packet_hdr(pkt)->frame_len = phdr->frame_len;
+		odp_packet_hdr(pkt)->headroom = phdr->headroom;
+		odp_packet_hdr(pkt)->tailroom = phdr->tailroom;
+		pkt_table[i] = pkt;
+	}
+
+	/* Now tell other process that we no longer need that buffers.*/
+	pkts = odph_ring_mp_enqueue_burst(r_p, ipcbufs_p, pkts);
+	if (odp_unlikely(pkts < 0))
+		ODP_ABORT("ipc: odp_ring_mp_enqueue_bulk r_p fail\n");
+
+	return pkts;
+}
+
+int ipc_pktio_send(pktio_entry_t *pktio_entry, odp_packet_t pkt_table[],
+		   unsigned len)
+{
+	odph_ring_t *r;
+	odph_ring_t *r_p;
+	void **rbuf_p;
+	int ret;
+	unsigned i;
+
+	if (pktio_entry->s.type == ODP_PKTIO_TYPE_IPC_SLAVE) {
+		r = pktio_entry->s.ipc.s.prod;
+		r_p = pktio_entry->s.ipc.s.cons;
+	} else if (pktio_entry->s.type == ODP_PKTIO_TYPE_IPC) {
+		r = pktio_entry->s.ipc.m.prod;
+		r_p = pktio_entry->s.ipc.m.cons;
+	} else {
+		ODP_ABORT("wrong type: %d\n", pktio_entry->s.type);
+	}
+
+	/* Free already processed packets, if any */
+	while (1) {
+		odp_packet_t r_p_pkts[PKTIO_IPC_ENTRIES];
+
+		rbuf_p = (void *)&r_p_pkts;
+		ret = odph_ring_mc_dequeue_burst(r_p, rbuf_p,
+						 PKTIO_IPC_ENTRIES);
+		if (0 == ret)
+			break;
+		for (i = 0; i < (unsigned)ret; i++)
+			odp_packet_free(r_p_pkts[i]);
+	}
+
+	/* Prepare packets: calculate offset from address. */
+	for (i = 0; i < len; i++) {
+		int j;
+		odp_packet_t pkt =  pkt_table[i];
+		odp_packet_hdr_t *pkt_hdr = odp_packet_hdr(pkt);
+
+		rbuf_p = (void *)&pkt;
+
+		/* buf_hdr.addr can not be used directly in remote process,
+		 * convert it to offset
+		 */
+		for (j = 0; j < ODP_BUFFER_MAX_SEG; j++)
+			pkt_hdr->buf_hdr.ipc_addr_offset[j] = (char *)pkt_hdr -
+				(char *)pkt_hdr->buf_hdr.addr[j];
+	}
+
+	/* Put packets to ring to be processed in other process. */
+	rbuf_p = (void *)&pkt_table[0];
+	ret = odph_ring_mp_enqueue_burst(r, rbuf_p, len);
+	if (odp_unlikely(ret < 0)) {
+		ODP_ERR("pid %d odp_ring_mp_enqueue_bulk fail, ipc_slave %d, ret %d\n",
+			getpid(),
+			(ODP_PKTIO_TYPE_IPC_SLAVE == pktio_entry->s.type),
+			ret);
+		ODP_ERR("odp_ring_full: %d, odp_ring_count %d, odph_ring_free_count %d\n",
+			odph_ring_full(r), odph_ring_count(r),
+			odph_ring_free_count(r));
+	}
+
+	return ret;
+}
diff --git a/platform/linux-generic/odp_pool.c b/platform/linux-generic/odp_pool.c
index b2f30dc..88997c1 100644
--- a/platform/linux-generic/odp_pool.c
+++ b/platform/linux-generic/odp_pool.c
@@ -222,8 +222,11 @@  odp_pool_t odp_pool_create(const char *name,
 			ODP_ALIGN_ROUNDUP(params->pkt.len, seg_len);
 
 		/* Reject create if pkt.len needs too many segments */
-		if (blk_size / seg_len > ODP_BUFFER_MAX_SEG)
+		if (blk_size / seg_len > ODP_BUFFER_MAX_SEG) {
+			ODP_ERR("ODP_BUFFER_MAX_SEG exceed %d(%d)\n",
+				blk_size / seg_len, ODP_BUFFER_MAX_SEG);
 			return ODP_POOL_INVALID;
+		}
 
 		p_udata_size = params->pkt.uarea_size;
 		udata_stride = ODP_ALIGN_ROUNDUP(p_udata_size,
@@ -244,8 +247,12 @@  odp_pool_t odp_pool_create(const char *name,
 
 	/* Validate requested number of buffers against addressable limits */
 	if (buf_num >
-	    (ODP_BUFFER_MAX_BUFFERS / (buf_stride / ODP_CACHE_LINE_SIZE)))
+	    (ODP_BUFFER_MAX_BUFFERS / (buf_stride / ODP_CACHE_LINE_SIZE))) {
+		ODP_ERR("buf_num %d > then expected %d\n",
+			buf_num, ODP_BUFFER_MAX_BUFFERS /
+			(buf_stride / ODP_CACHE_LINE_SIZE));
 		return ODP_POOL_INVALID;
+	}
 
 	/* Find an unused buffer pool slot and iniitalize it as requested */
 	for (i = 0; i < ODP_CONFIG_POOLS; i++) {
@@ -305,8 +312,12 @@  odp_pool_t odp_pool_create(const char *name,
 			pool->s.pool_base_addr = odp_shm_addr(shm);
 		} else {
 			odp_shm_info_t info;
-			if (odp_shm_info(shm, &info) != 0 ||
-			    info.size < pool->s.pool_size) {
+			int ret;
+
+			ret = odp_shm_info(shm, &info);
+			if (ret != 0 || info.size < pool->s.pool_size) {
+				ODP_ERR("shm info %d, info size %ld, pool size %ld\n",
+					ret, info.size, pool->s.pool_size);
 				POOL_UNLOCK(&pool->s.lock);
 				return ODP_POOL_INVALID;
 			}
@@ -319,6 +330,7 @@  odp_pool_t odp_pool_create(const char *name,
 				    ((size_t)page_addr -
 				     (size_t)pool->s.pool_base_addr)) {
 					POOL_UNLOCK(&pool->s.lock);
+					ODP_ERR("small shm size\n");
 					return ODP_POOL_INVALID;
 				}
 				pool->s.pool_base_addr = page_addr;
diff --git a/platform/linux-generic/odp_shared_memory.c b/platform/linux-generic/odp_shared_memory.c
index ab48dda..5de48d3 100644
--- a/platform/linux-generic/odp_shared_memory.c
+++ b/platform/linux-generic/odp_shared_memory.c
@@ -15,6 +15,7 @@ 
 #include <odp/debug.h>
 #include <odp_debug_internal.h>
 #include <odp_align_internal.h>
+#include <odp_shm_internal.h>
 #include <odp/config.h>
 
 #include <unistd.h>
@@ -189,7 +190,7 @@  odp_shm_t odp_shm_reserve(const char *name, uint64_t size, uint64_t align,
 	int fd = -1;
 	int map_flag = MAP_SHARED;
 	/* If already exists: O_EXCL: error, O_TRUNC: truncate to zero */
-	int oflag = O_RDWR | O_CREAT | O_TRUNC;
+	int oflag = O_RDWR;
 	uint64_t alloc_size;
 	uint64_t page_sz, huge_sz;
 #ifdef MAP_HUGETLB
@@ -207,7 +208,12 @@  odp_shm_t odp_shm_reserve(const char *name, uint64_t size, uint64_t align,
 	alloc_hp_size = (size + align + (huge_sz - 1)) & (-huge_sz);
 #endif
 
-	if (flags & ODP_SHM_PROC) {
+	if (flags & ODP_SHM_PROC)
+		oflag |= O_CREAT | O_TRUNC;
+
+	if (flags & (ODP_SHM_PROC | _ODP_SHM_PROC_NOCREAT)) {
+		need_huge_page = 0;
+
 		/* Creates a file to /dev/shm */
 		fd = shm_open(name, oflag,
 			      S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH);