[dpdk-dev] [PATCH v3 09/10] eal: add EAL argument for setting thread priority

[Narcisa Ana Maria Vasile <navasile@linux.microsoft.com>]

From: Narcisa Vasile <navasile@microsoft.com>

Allow the user to choose the thread priority through an EAL
command line argument.

The user can select the thread priority to be either 'normal'
or 'critical':
--thread-prio normal
--thread-prio realtime

Signed-off-by: Narcisa Vasile <navasile@microsoft.com>
---
 lib/librte_eal/common/eal_common_options.c | 28 +++++++++++++++++++++-
 lib/librte_eal/common/eal_internal_cfg.h   |  2 ++
 lib/librte_eal/common/eal_options.h        |  2 ++
 3 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/lib/librte_eal/common/eal_common_options.c b/lib/librte_eal/common/eal_common_options.c
index 622c7bc42..287a89a75 100644
--- a/lib/librte_eal/common/eal_common_options.c
+++ b/lib/librte_eal/common/eal_common_options.c
@@ -106,6 +106,7 @@ eal_long_options[] = {
 	{OPT_TELEMETRY,         0, NULL, OPT_TELEMETRY_NUM        },
 	{OPT_NO_TELEMETRY,      0, NULL, OPT_NO_TELEMETRY_NUM     },
 	{OPT_FORCE_MAX_SIMD_BITWIDTH, 1, NULL, OPT_FORCE_MAX_SIMD_BITWIDTH_NUM},
+	{OPT_THREAD_PRIORITY,   1, NULL, OPT_THREAD_PRIORITY_NUM},
 
 	/* legacy options that will be removed in future */
 	{OPT_PCI_BLACKLIST,     1, NULL, OPT_PCI_BLACKLIST_NUM    },
@@ -1383,6 +1384,24 @@ eal_parse_simd_bitwidth(const char *arg)
 	return 0;
 }
 
+static int
+eal_parse_thread_priority(const char *arg)
+{
+	struct internal_config *internal_conf =
+		eal_get_internal_configuration();
+	enum rte_thread_priority priority;
+
+	if (!strncmp("normal", arg, sizeof("normal")))
+		priority = RTE_THREAD_PRIORITY_NORMAL;
+	else if (!strncmp("realtime", arg, sizeof("realtime")))
+		priority = RTE_THREAD_PRIORITY_REALTIME_CRITICAL;
+	else
+		return -1;
+
+	internal_conf->thread_priority = priority;
+	return 0;
+}
+
 static int
 eal_parse_base_virtaddr(const char *arg)
 {
@@ -1796,7 +1815,13 @@ eal_parse_common_option(int opt, const char *optarg,
 			return -1;
 		}
 		break;
-
+	case OPT_THREAD_PRIORITY_NUM:
+		if (eal_parse_thread_priority(optarg) < 0) {
+			RTE_LOG(ERR, EAL, "invalid parameter for --"
+					OPT_THREAD_PRIORITY "\n");
+			return -1;
+		}
+		break;
 	/* don't know what to do, leave this to caller */
 	default:
 		return 1;
@@ -2059,6 +2084,7 @@ eal_common_usage(void)
 	       "                      (can be used multiple times)\n"
 	       "  --"OPT_VMWARE_TSC_MAP"    Use VMware TSC map instead of native RDTSC\n"
 	       "  --"OPT_PROC_TYPE"         Type of this process (primary|secondary|auto)\n"
+	       "  --"OPT_THREAD_PRIORITY"   Set threads priority (normal|realtime)\n"
 #ifndef RTE_EXEC_ENV_WINDOWS
 	       "  --"OPT_SYSLOG"            Set syslog facility\n"
 #endif
diff --git a/lib/librte_eal/common/eal_internal_cfg.h b/lib/librte_eal/common/eal_internal_cfg.h
index 51dbe86e2..7ab1d0008 100644
--- a/lib/librte_eal/common/eal_internal_cfg.h
+++ b/lib/librte_eal/common/eal_internal_cfg.h
@@ -93,6 +93,8 @@ struct internal_config {
 	unsigned int no_telemetry; /**< true to disable Telemetry */
 	struct simd_bitwidth max_simd_bitwidth;
 	/**< max simd bitwidth path to use */
+	enum rte_thread_priority thread_priority;
+	/**< thread priority to configure */
 };
 
 void eal_reset_internal_config(struct internal_config *internal_cfg);
diff --git a/lib/librte_eal/common/eal_options.h b/lib/librte_eal/common/eal_options.h
index 7b348e707..9f5b209f6 100644
--- a/lib/librte_eal/common/eal_options.h
+++ b/lib/librte_eal/common/eal_options.h
@@ -93,6 +93,8 @@ enum {
 	OPT_NO_TELEMETRY_NUM,
 #define OPT_FORCE_MAX_SIMD_BITWIDTH  "force-max-simd-bitwidth"
 	OPT_FORCE_MAX_SIMD_BITWIDTH_NUM,
+#define OPT_THREAD_PRIORITY          "thread-prio"
+	OPT_THREAD_PRIORITY_NUM,
 
 	/* legacy option that will be removed in future */
 #define OPT_PCI_BLACKLIST     "pci-blacklist"
-- 
2.30.0.vfs.0.2