[dpdk-dev] add one option memory-only for those secondary PRBs

diff --git a/lib/librte_eal/common/eal_common_options.c b/lib/librte_eal/common/eal_common_options.c
old mode 100644
new mode 100755
index e2810ab..5ab4b87
--- a/lib/librte_eal/common/eal_common_options.c
+++ b/lib/librte_eal/common/eal_common_options.c
@@ -85,6 +85,7 @@  eal_long_options[] = {
 	{OPT_XEN_DOM0, 0, 0, OPT_XEN_DOM0_NUM},
 	{OPT_CREATE_UIO_DEV, 1, NULL, OPT_CREATE_UIO_DEV_NUM},
 	{OPT_VFIO_INTR, 1, NULL, OPT_VFIO_INTR_NUM},
+    {OPT_MEMORY_ONLY, 0, NULL, OPT_MEMORY_ONLY_NUM},
 	{0, 0, 0, 0}
 };
 
@@ -126,6 +127,7 @@  eal_reset_internal_config(struct internal_config *internal_cfg)
 	internal_cfg->no_hpet = 1;
 #endif
 	internal_cfg->vmware_tsc_map = 0;
+    internal_cfg->memory_only= 0;
 }
 
 /*
@@ -454,6 +456,10 @@  eal_parse_common_option(int opt, const char *optarg,
 		conf->process_type = eal_parse_proc_type(optarg);
 		break;
 
+	case OPT_MEMORY_ONLY_NUM:
+		conf->memory_only= 1;
+		break;
+
 	case OPT_MASTER_LCORE_NUM:
 		if (eal_parse_master_lcore(optarg) < 0) {
 			RTE_LOG(ERR, EAL, "invalid parameter for --"
@@ -525,9 +531,9 @@  eal_check_common_options(struct internal_config *internal_cfg)
 {
 	struct rte_config *cfg = rte_eal_get_configuration();
 
-	if (!lcores_parsed) {
-		RTE_LOG(ERR, EAL, "CPU cores must be enabled with options "
-			"-c or -l\n");
+	if (!lcores_parsed && !(internal_cfg->process_type == RTE_PROC_SECONDARY&& internal_cfg->memory_only) ) {
+		RTE_LOG(ERR, EAL, "For those processes without memory-only option, CPU cores "
+            "must be enabled with options -c or -l\n");
 		return -1;
 	}
 	if (cfg->lcore_role[cfg->master_lcore] != ROLE_RTE) {
@@ -545,6 +551,11 @@  eal_check_common_options(struct internal_config *internal_cfg)
 			"specified\n");
 		return -1;
 	}
+	if ( internal_cfg->process_type != RTE_PROC_SECONDARY &&
+			internal_cfg->memory_only) {
+		RTE_LOG(ERR, EAL, "only secondary processes can specify memory-only option.\n");
+		return -1;
+	}
 	if (index(internal_cfg->hugefile_prefix, '%') != NULL) {
 		RTE_LOG(ERR, EAL, "Invalid char, '%%', in --"OPT_FILE_PREFIX" "
 			"option\n");
@@ -590,6 +601,7 @@  eal_common_usage(void)
 	       "  --"OPT_SYSLOG"     : set syslog facility\n"
 	       "  --"OPT_LOG_LEVEL"  : set default log level\n"
 	       "  --"OPT_PROC_TYPE"  : type of this process\n"
+           "  --"OPT_MEMORY_ONLY": only use shared memory, valid only for secondary process."
 	       "  --"OPT_PCI_BLACKLIST", -b: add a PCI device in black list.\n"
 	       "               Prevent EAL from using this PCI device. The argument\n"
 	       "               format is <domain:bus:devid.func>.\n"
diff --git a/lib/librte_eal/common/eal_internal_cfg.h b/lib/librte_eal/common/eal_internal_cfg.h
old mode 100644
new mode 100755
index aac6abf..68b982c
--- a/lib/librte_eal/common/eal_internal_cfg.h
+++ b/lib/librte_eal/common/eal_internal_cfg.h
@@ -85,6 +85,7 @@  struct internal_config {
 
 	unsigned num_hugepage_sizes;      /**< how many sizes on this system */
 	struct hugepage_info hugepage_info[MAX_HUGEPAGE_SIZES];
+    volatile unsigned memory_only;    /**<wheter the seconday process only need shared momory only or not */
 };
 extern struct internal_config internal_config; /**< Global EAL configuration. */
 
diff --git a/lib/librte_eal/common/eal_options.h b/lib/librte_eal/common/eal_options.h
old mode 100644
new mode 100755
index e476f8d..6ddff1b
--- a/lib/librte_eal/common/eal_options.h
+++ b/lib/librte_eal/common/eal_options.h
@@ -76,7 +76,9 @@  enum {
 #define OPT_CREATE_UIO_DEV "create-uio-dev"
 	OPT_CREATE_UIO_DEV_NUM,
 #define OPT_VFIO_INTR    "vfio-intr"
-	OPT_VFIO_INTR_NUM,
+        OPT_VFIO_INTR_NUM,
+#define OPT_MEMORY_ONLY  "memory-only"
+        OPT_MEMORY_ONLY_NUM,
 	OPT_LONG_MAX_NUM
 };
 
diff --git a/lib/librte_eal/linuxapp/eal/eal.c b/lib/librte_eal/linuxapp/eal/eal.c
old mode 100644
new mode 100755
index 89f3b5e..a03e511
--- a/lib/librte_eal/linuxapp/eal/eal.c
+++ b/lib/librte_eal/linuxapp/eal/eal.c
@@ -752,14 +752,16 @@  rte_eal_init(int argc, char **argv)
 
 	rte_config_init();
 
-	if (rte_eal_pci_init() < 0)
-		rte_panic("Cannot init PCI\n");
+    /*with memory-only option, we need not cpu affinity, pci device, alarm, external devices, interrupt, etc. */
+    if( !internal_config.memory_only ){
+    	if (rte_eal_pci_init() < 0)
+    		rte_panic("Cannot init PCI\n");
 
 #ifdef RTE_LIBRTE_IVSHMEM
 	if (rte_eal_ivshmem_init() < 0)
 		rte_panic("Cannot init IVSHMEM\n");
 #endif
-
+    }
 	if (rte_eal_memory_init() < 0)
 		rte_panic("Cannot init memory\n");
 
@@ -772,73 +774,73 @@  rte_eal_init(int argc, char **argv)
 	if (rte_eal_tailqs_init() < 0)
 		rte_panic("Cannot init tail queues for objects\n");
 
-#ifdef RTE_LIBRTE_IVSHMEM
-	if (rte_eal_ivshmem_obj_init() < 0)
-		rte_panic("Cannot init IVSHMEM objects\n");
-#endif
-
 	if (rte_eal_log_init(logid, internal_config.syslog_facility) < 0)
 		rte_panic("Cannot init logs\n");
 
-	if (rte_eal_alarm_init() < 0)
-		rte_panic("Cannot init interrupt-handling thread\n");
-
-	if (rte_eal_intr_init() < 0)
-		rte_panic("Cannot init interrupt-handling thread\n");
-
-	if (rte_eal_timer_init() < 0)
-		rte_panic("Cannot init HPET or TSC timers\n");
-
-	eal_check_mem_on_local_socket();
-
-	rte_eal_mcfg_complete();
-
-	TAILQ_FOREACH(solib, &solib_list, next) {
-		RTE_LOG(INFO, EAL, "open shared lib %s\n", solib->name);
-		solib->lib_handle = dlopen(solib->name, RTLD_NOW);
-		if (solib->lib_handle == NULL)
-			RTE_LOG(WARNING, EAL, "%s\n", dlerror());
-	}
-
-	eal_thread_init_master(rte_config.master_lcore);
-
-	RTE_LOG(DEBUG, EAL, "Master core %u is ready (tid=%x)\n",
-		rte_config.master_lcore, (int)thread_id);
-
-	if (rte_eal_dev_init() < 0)
-		rte_panic("Cannot init pmd devices\n");
-
-	RTE_LCORE_FOREACH_SLAVE(i) {
-
-		/*
-		 * create communication pipes between master thread
-		 * and children
-		 */
-		if (pipe(lcore_config[i].pipe_master2slave) < 0)
-			rte_panic("Cannot create pipe\n");
-		if (pipe(lcore_config[i].pipe_slave2master) < 0)
-			rte_panic("Cannot create pipe\n");
-
-		lcore_config[i].state = WAIT;
-
-		/* create a thread for each lcore */
-		ret = pthread_create(&lcore_config[i].thread_id, NULL,
-				     eal_thread_loop, NULL);
-		if (ret != 0)
-			rte_panic("Cannot create thread\n");
-	}
-
-	/*
-	 * Launch a dummy function on all slave lcores, so that master lcore
-	 * knows they are all ready when this function returns.
-	 */
-	rte_eal_mp_remote_launch(sync_func, NULL, SKIP_MASTER);
-	rte_eal_mp_wait_lcore();
-
-	/* Probe & Initialize PCI devices */
-	if (rte_eal_pci_probe())
-		rte_panic("Cannot probe PCI\n");
-
+    if( !internal_config.memory_only ){
+#ifdef RTE_LIBRTE_IVSHMEM
+        if (rte_eal_ivshmem_obj_init() < 0)
+            rte_panic("Cannot init IVSHMEM objects\n");
+#endif        
+        if (rte_eal_alarm_init() < 0)
+    		rte_panic("Cannot init interrupt-handling thread\n");
+
+    	if (rte_eal_intr_init() < 0)
+    		rte_panic("Cannot init interrupt-handling thread\n");
+
+    	if (rte_eal_timer_init() < 0)
+    		rte_panic("Cannot init HPET or TSC timers\n");
+
+    	eal_check_mem_on_local_socket();
+
+    	rte_eal_mcfg_complete();
+
+    	TAILQ_FOREACH(solib, &solib_list, next) {
+    		RTE_LOG(INFO, EAL, "open shared lib %s\n", solib->name);
+    		solib->lib_handle = dlopen(solib->name, RTLD_NOW);
+    		if (solib->lib_handle == NULL)
+    			RTE_LOG(WARNING, EAL, "%s\n", dlerror());
+    	}
+
+    	eal_thread_init_master(rte_config.master_lcore);
+
+    	RTE_LOG(DEBUG, EAL, "Master core %u is ready (tid=%x)\n",
+    		rte_config.master_lcore, (int)thread_id);
+
+    	if (rte_eal_dev_init() < 0)
+    		rte_panic("Cannot init pmd devices\n");
+
+    	RTE_LCORE_FOREACH_SLAVE(i) {
+
+    		/*
+        		 * create communication pipes between master thread
+        		 * and children
+        		 */
+    		if (pipe(lcore_config[i].pipe_master2slave) < 0)
+    			rte_panic("Cannot create pipe\n");
+    		if (pipe(lcore_config[i].pipe_slave2master) < 0)
+    			rte_panic("Cannot create pipe\n");
+
+    		lcore_config[i].state = WAIT;
+
+    		/* create a thread for each lcore */
+    		ret = pthread_create(&lcore_config[i].thread_id, NULL,
+    				     eal_thread_loop, NULL);
+    		if (ret != 0)
+    			rte_panic("Cannot create thread\n");
+    	}
+
+    	/*
+        	 * Launch a dummy function on all slave lcores, so that master lcore
+        	 * knows they are all ready when this function returns.
+        	 */
+        	rte_eal_mp_remote_launch(sync_func, NULL, SKIP_MASTER);
+        	rte_eal_mp_wait_lcore();
+
+    	/* Probe & Initialize PCI devices */
+    	if (rte_eal_pci_probe())
+    		rte_panic("Cannot probe PCI\n");
+    }
 	return fctret;
 }
 
@@ -859,3 +861,4 @@  int rte_eal_has_hugepages(void)
 {
 	return ! internal_config.no_hugetlbfs;
 }
+