examples/nvme: export DPDK single file descriptor memory segments as input parameter

Similar with existing virtio user driver, we need to enable "--single-file-segments"
option in DPDK as the target only support limited number of memory regions, for
coming vfio-user feature, the requirement is same, so here we enable the option
with identify&perf tools in advance.

Change-Id: I83d78b403a8c1ec0c76a5bf21aac6bed109931c3
Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/4612
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Community-CI: Mellanox Build Bot
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>

examples/nvme/identify/identify.c

@@ -91,6 +91,8 @@ static int g_shm_id = -1;
 
 static int g_dpdk_mem = 0;
 
+static bool g_dpdk_mem_single_seg = false;
+
 static int g_master_core = 0;
 
 static char g_core_mask[16] = "0x1";
@@ -1776,6 +1778,7 @@ usage(const char *program_name)
 	printf(" -i         shared memory group ID\n");
 	printf(" -p         core number in decimal to run this application which started from 0\n");
 	printf(" -d         DPDK huge memory size in MB\n");
+	printf(" -g         use single file descriptor for DPDK memory segments\n");
 	printf(" -x         print hex dump of raw data\n");
 	printf(" -v         verbose (enable warnings)\n");
 	printf(" -V         enumerate VMD\n");
@@ -1790,7 +1793,7 @@ parse_args(int argc, char **argv)
 	spdk_nvme_trid_populate_transport(&g_trid, SPDK_NVME_TRANSPORT_PCIE);
 	snprintf(g_trid.subnqn, sizeof(g_trid.subnqn), "%s", SPDK_NVMF_DISCOVERY_NQN);
 
-	while ((op = getopt(argc, argv, "d:i:p:r:xHL:V")) != -1) {
+	while ((op = getopt(argc, argv, "d:gi:p:r:xHL:V")) != -1) {
 		switch (op) {
 		case 'd':
 			g_dpdk_mem = spdk_strtol(optarg, 10);
@@ -1799,6 +1802,9 @@ parse_args(int argc, char **argv)
 				return g_dpdk_mem;
 			}
 			break;
+		case 'g':
+			g_dpdk_mem_single_seg = true;
+			break;
 		case 'i':
 			g_shm_id = spdk_strtol(optarg, 10);
 			if (g_shm_id < 0) {
@@ -1883,6 +1889,7 @@ int main(int argc, char **argv)
 	opts.mem_channel = 1;
 	opts.master_core = g_master_core;
 	opts.core_mask = g_core_mask;
+	opts.hugepage_single_segments = g_dpdk_mem_single_seg;
 	if (g_trid.trtype != SPDK_NVME_TRANSPORT_PCIE) {
 		opts.no_pci = true;
 	}

examples/nvme/perf/perf.c

@@ -241,6 +241,7 @@ static int g_time_in_sec;
 static int g_warmup_time_in_sec;
 static uint32_t g_max_completions;
 static int g_dpdk_mem;
+static bool g_dpdk_mem_single_seg = false;
 static int g_shm_id = -1;
 static uint32_t g_disable_sq_cmb;
 static bool g_use_uring;
@@ -1404,6 +1405,7 @@ static void usage(char *program_name)
 	printf("\t          -e 'PRACT=1,PRCHK=GUARD'\n");
 	printf("\t[-k keep alive timeout period in millisecond]\n");
 	printf("\t[-s DPDK huge memory size in MB.]\n");
+	printf("\t[-g use single file descriptor for DPDK memory segments]\n");
 	printf("\t[-C max completions per poll]\n");
 	printf("\t\t(default: 0 - unlimited)\n");
 	printf("\t[-i shared memory group ID]\n");
@@ -1807,7 +1809,7 @@ parse_args(int argc, char **argv)
 	long int val;
 	int rc;
 
-	while ((op = getopt(argc, argv, "a:c:e:i:lo:q:r:k:s:t:w:z:A:C:DGHILM:NP:RS:T:U:VZ:")) != -1) {
+	while ((op = getopt(argc, argv, "a:c:e:gi:lo:q:r:k:s:t:w:z:A:C:DGHILM:NP:RS:T:U:VZ:")) != -1) {
 		switch (op) {
 		case 'a':
 		case 'A':
@@ -1882,6 +1884,9 @@ parse_args(int argc, char **argv)
 				return 1;
 			}
 			break;
+		case 'g':
+			g_dpdk_mem_single_seg = true;
+			break;
 		case 'l':
 			g_latency_ssd_tracking_enable = true;
 			break;
@@ -2285,6 +2290,7 @@ int main(int argc, char **argv)
 	if (g_dpdk_mem) {
 		opts.mem_size = g_dpdk_mem;
 	}
+	opts.hugepage_single_segments = g_dpdk_mem_single_seg;
 	if (g_no_pci) {
 		opts.no_pci = g_no_pci;
 	}