[dpdk-dev] [PATCH v7 01/14] eal: do not panic on cpu detection

[Aaron Conole <aconole@redhat.com>]

There may be no way to gracefully recover, but the application
should be notified that a failure happened, rather than completely
aborting.  This allows the user to proceed with a "slow-path" type
solution.

After this change, the EAL CPU NUMA node resolution step can no longer
emit an rte_panic.  This aligns with the code in rte_eal_init, which
expects failures to return an error code.

Signed-off-by: Aaron Conole <aconole@redhat.com>
---
 lib/librte_eal/bsdapp/eal/eal.c          | 14 ++++++++++++--
 lib/librte_eal/common/eal_common_lcore.c |  7 ++++---
 lib/librte_eal/linuxapp/eal/eal.c        | 14 ++++++++++++--
 3 files changed, 28 insertions(+), 7 deletions(-)

diff --git a/lib/librte_eal/bsdapp/eal/eal.c b/lib/librte_eal/bsdapp/eal/eal.c
index ee7c9de..12df127 100644
--- a/lib/librte_eal/bsdapp/eal/eal.c
+++ b/lib/librte_eal/bsdapp/eal/eal.c
@@ -56,6 +56,7 @@
 #include <rte_launch.h>
 #include <rte_eal.h>
 #include <rte_eal_memconfig.h>
+#include <rte_errno.h>
 #include <rte_per_lcore.h>
 #include <rte_lcore.h>
 #include <rte_log.h>
@@ -487,6 +488,12 @@ rte_eal_iopl_init(void)
 	return 0;
 }
 
+static void rte_eal_init_alert(const char *msg)
+{
+	fprintf(stderr, "EAL: FATAL: %s\n", msg);
+	RTE_LOG(ERR, EAL, "%s\n", msg);
+}
+
 /* Launch threads, called at application init(). */
 int
 rte_eal_init(int argc, char **argv)
@@ -510,8 +517,11 @@ rte_eal_init(int argc, char **argv)
 	/* set log level as early as possible */
 	rte_set_log_level(internal_config.log_level);
 
-	if (rte_eal_cpu_init() < 0)
-		rte_panic("Cannot detect lcores\n");
+	if (rte_eal_cpu_init() < 0) {
+		rte_eal_init_alert("Cannot detect lcores.");
+		rte_errno = ENOTSUP;
+		return -1;
+	}
 
 	fctret = eal_parse_args(argc, argv);
 	if (fctret < 0)
diff --git a/lib/librte_eal/common/eal_common_lcore.c b/lib/librte_eal/common/eal_common_lcore.c
index 2cd4132..84fa0cb 100644
--- a/lib/librte_eal/common/eal_common_lcore.c
+++ b/lib/librte_eal/common/eal_common_lcore.c
@@ -83,16 +83,17 @@ rte_eal_cpu_init(void)
 		config->lcore_role[lcore_id] = ROLE_RTE;
 		lcore_config[lcore_id].core_id = eal_cpu_core_id(lcore_id);
 		lcore_config[lcore_id].socket_id = eal_cpu_socket_id(lcore_id);
-		if (lcore_config[lcore_id].socket_id >= RTE_MAX_NUMA_NODES)
+		if (lcore_config[lcore_id].socket_id >= RTE_MAX_NUMA_NODES) {
 #ifdef RTE_EAL_ALLOW_INV_SOCKET_ID
 			lcore_config[lcore_id].socket_id = 0;
 #else
-			rte_panic("Socket ID (%u) is greater than "
+			RTE_LOG(ERR, EAL, "Socket ID (%u) is greater than "
 				"RTE_MAX_NUMA_NODES (%d)\n",
 				lcore_config[lcore_id].socket_id,
 				RTE_MAX_NUMA_NODES);
+			return -1;
 #endif
-
+		}
 		RTE_LOG(DEBUG, EAL, "Detected lcore %u as "
 				"core %u on socket %u\n",
 				lcore_id, lcore_config[lcore_id].core_id,
diff --git a/lib/librte_eal/linuxapp/eal/eal.c b/lib/librte_eal/linuxapp/eal/eal.c
index bf6b818..81692e7 100644
--- a/lib/librte_eal/linuxapp/eal/eal.c
+++ b/lib/librte_eal/linuxapp/eal/eal.c
@@ -61,6 +61,7 @@
 #include <rte_launch.h>
 #include <rte_eal.h>
 #include <rte_eal_memconfig.h>
+#include <rte_errno.h>
 #include <rte_per_lcore.h>
 #include <rte_lcore.h>
 #include <rte_log.h>
@@ -740,6 +741,12 @@ static int rte_eal_vfio_setup(void)
 }
 #endif
 
+static void rte_eal_init_alert(const char *msg)
+{
+	fprintf(stderr, "EAL: FATAL: %s\n", msg);
+	RTE_LOG(ERR, EAL, "%s\n", msg);
+}
+
 /* Launch threads, called at application init(). */
 int
 rte_eal_init(int argc, char **argv)
@@ -767,8 +774,11 @@ rte_eal_init(int argc, char **argv)
 	/* set log level as early as possible */
 	rte_set_log_level(internal_config.log_level);
 
-	if (rte_eal_cpu_init() < 0)
-		rte_panic("Cannot detect lcores\n");
+	if (rte_eal_cpu_init() < 0) {
+		rte_eal_init_alert("Cannot detect lcores.");
+		rte_errno = ENOTSUP;
+		return -1;
+	}
 
 	fctret = eal_parse_args(argc, argv);
 	if (fctret < 0)
-- 
2.9.3