app/testpmd: replace hardcoded min mbuf number with macro

[ upstream commit 57d91f5b8dc589226a307560bd36181ac7a6b7df ]

Add macro MIN_TOTAL_NUM_MBUFS (1024) to indicate
what the value of total-num-mbufs should bigger than.

Fixes: c879881 ("app/testpmd: add --total-num-mbufs option")

Signed-off-by: Mingxia Liu <mingxia.liu@intel.com>
Acked-by: Yuying Zhang <yuying.zhang@intel.com>
Acked-by: Ferruh Yigit <ferruh.yigit@xilinx.com>

app/test-pmd/parameters.c

@@ -873,11 +873,12 @@ launch_args_parse(int argc, char** argv)
 			}
 			if (!strcmp(lgopts[opt_idx].name, "total-num-mbufs")) {
 				n = atoi(optarg);
-				if (n > 1024)
+				if (n > MIN_TOTAL_NUM_MBUFS)
 					param_total_num_mbufs = (unsigned)n;
 				else
 					rte_exit(EXIT_FAILURE,
-						 "total-num-mbufs should be > 1024\n");
+						 "total-num-mbufs should be > %d\n",
+						 MIN_TOTAL_NUM_MBUFS);
 			}
 			if (!strcmp(lgopts[opt_idx].name, "max-pkt-len")) {
 				n = atoi(optarg);

app/test-pmd/testpmd.h

@@ -53,6 +53,8 @@
 #define NUMA_NO_CONFIG 0xFF
 #define UMA_NO_CONFIG  0xFF
 
+#define MIN_TOTAL_NUM_MBUFS 1024
+
 typedef uint8_t  lcoreid_t;
 typedef uint16_t portid_t;
 typedef uint16_t queueid_t;