[PATCH v2] examples/qos_sched: fix bad bit shift operation

[PATCH v2] examples/qos_sched: fix bad bit shift operation

[Michal Jastrzebski]

Fix issue reported by Coverity.
Date: Thu, 21 Apr 2016 13:47:33 +0200
Message-Id: <1461239256-8104-2-git-send-email-michalx.k.jastrzebski@intel.com>
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In-Reply-To: <1461239256-8104-1-git-send-email-michalx.k.jastrzebski@intel.com>
References: <1461239256-8104-1-git-send-email-michalx.k.jastrzebski@intel.com>

From: Slawomir Mrozowicz <slawomirx.mrozowicz@intel.com>

Coverity ID 30690: Bad bit shift operation
large_shift: In expression 1ULL << i, left shifting by more than 63 bits
has undefined behavior. The shift amount, i, is as much as 127.

Fixes: de3cfa2c9823 ("sched: initial import")

Signed-off-by: Slawomir Mrozowicz <slawomirx.mrozowicz@intel.com>
---
 examples/qos_sched/args.c | 84 +++++++++++++++++++++++++++++------------------
 1 file changed, 52 insertions(+), 32 deletions(-)

diff --git a/examples/qos_sched/args.c b/examples/qos_sched/args.c
index 3e7fd08..cd077ba 100644
--- a/examples/qos_sched/args.c
+++ b/examples/qos_sched/args.c
@@ -53,7 +53,7 @@
 
 static uint32_t app_master_core = 1;
 static uint32_t app_numa_mask;
-static uint64_t app_used_core_mask = 0;
+static int app_used_core_mask[RTE_MAX_LCORE];
 static uint64_t app_used_port_mask = 0;
 static uint64_t app_used_rx_port_mask = 0;
 static uint64_t app_used_tx_port_mask = 0;
@@ -115,22 +115,23 @@ static inline int str_is(const char *str, const char *is)
 	return strcmp(str, is) == 0;
 }
 
-/* returns core mask used by DPDK */
-static uint64_t
-app_eal_core_mask(void)
+/* compare used core with eal configuration,
+	returns:
+		1 if equal
+		0 if differ */
+static int
+app_eal_core_check(void)
 {
-	uint32_t i;
-	uint64_t cm = 0;
+	uint16_t i;
+	int ret = 1;
 	struct rte_config *cfg = rte_eal_get_configuration();
 
-	for (i = 0; i < RTE_MAX_LCORE; i++) {
-		if (cfg->lcore_role[i] == ROLE_RTE)
-			cm |= (1ULL << i);
+	for (i = 0; i < RTE_MAX_LCORE && ret; i++) {
+		if ((cfg->lcore_role[i] == ROLE_RTE) != app_used_core_mask[i])
+			ret = 0;
 	}
 
-	cm |= (1ULL << cfg->master_lcore);
-
-	return cm;
+	return ret;
 }
 
 
@@ -292,14 +293,9 @@ app_parse_flow_conf(const char *conf_str)
 	app_used_tx_port_mask |= mask;
 	app_used_port_mask |= mask;
 
-	mask = 1lu << pconf->rx_core;
-	app_used_core_mask |= mask;
-
-	mask = 1lu << pconf->wt_core;
-	app_used_core_mask |= mask;
-
-	mask = 1lu << pconf->tx_core;
-	app_used_core_mask |= mask;
+	app_used_core_mask[pconf->rx_core] = 1;
+	app_used_core_mask[pconf->wt_core] = 1;
+	app_used_core_mask[pconf->tx_core] = 1;
 
 	nb_pfc++;
 
@@ -335,7 +331,7 @@ app_parse_args(int argc, char **argv)
 	int option_index;
 	const char *optname;
 	char *prgname = argv[0];
-	uint32_t i, nb_lcores;
+	uint16_t i, j, k, nb_lcores;
 
 	static struct option lgopts[] = {
 		{ "pfc", 1, 0, 0 },
@@ -349,6 +345,9 @@ app_parse_args(int argc, char **argv)
 		{ NULL,  0, 0, 0 }
 	};
 
+	for (i = 0; i < RTE_MAX_LCORE; i++)
+		app_used_core_mask[i] = 0;
+
 	/* initialize EAL first */
 	ret = rte_eal_init(argc, argv);
 	if (ret < 0)
@@ -436,19 +435,40 @@ app_parse_args(int argc, char **argv)
 	}
 
 	/* check master core index validity */
-	for(i = 0; i <= app_master_core; i++) {
-		if (app_used_core_mask & (1u << app_master_core)) {
-			RTE_LOG(ERR, APP, "Master core index is not configured properly\n");
-			app_usage(prgname);
-			return -1;
-		}
+	if (app_used_core_mask[app_master_core] == 1) {
+		RTE_LOG(ERR, APP,
+			"Master core index is not configured properly\n");
+		app_usage(prgname);
+		return -1;
 	}
-	app_used_core_mask |= 1u << app_master_core;
+	app_used_core_mask[app_master_core] = 1;
+
+	if ((app_eal_core_check() == 0) ||
+		(app_master_core != rte_get_master_lcore())) {
+
+		char used_hexstr[RTE_MAX_LCORE/4+1];
+		char conf_hexstr[RTE_MAX_LCORE/4+1];
+		int used_byte, conf_byte;
+		struct rte_config *cfg = rte_eal_get_configuration();
+
+		for (i = 0; i < RTE_MAX_LCORE/4; i++) {
+			used_byte = 0;
+			conf_byte = 0;
+			for (j = 0; j < 3; j++) {
+				k = 4 * (RTE_MAX_LCORE/4 - i - 1) + j;
+				used_byte += app_used_core_mask[k] << j;
+				conf_byte +=
+					((cfg->lcore_role[k] ==
+					ROLE_RTE)?1:0) << j;
+			}
+			sprintf(&used_hexstr[i], "%1x", used_byte);
+			sprintf(&conf_hexstr[i], "%1x", used_byte);
+		}
+
+		RTE_LOG(ERR, APP, "EAL core mask not configured properly\n");
+		RTE_LOG(ERR, APP, "  must be   : %s\n", used_hexstr);
+		RTE_LOG(ERR, APP, "  instead of: %s\n", conf_hexstr);
 
-	if ((app_used_core_mask != app_eal_core_mask()) ||
-			(app_master_core != rte_get_master_lcore())) {
-		RTE_LOG(ERR, APP, "EAL core mask not configured properly, must be %" PRIx64
-				" instead of %" PRIx64 "\n" , app_used_core_mask, app_eal_core_mask());
 		return -1;
 	}
 
-- 
1.9.1