nvme: add latency parameter for passthru commands

Signed-off-by: Gollu Appalanaidu <anaidu.gollu@samsung.com>

diff --git a/nvme.c b/nvme.c
index 1666ba55d69cd5e10a7fdcf04d0c71e3f9d1543a..c2b34d00d0f7796906024dc5a7c659c099a99ba8 100644 (file)
--- a/nvme.c
+++ b/nvme.c
@@ -5446,11 +5446,14 @@ static int passthru(int argc, char **argv, int ioctl_cmd, uint8_t cmd_type,
        const char *re = "set dataflow direction to receive";
        const char *wr = "set dataflow direction to send";
        const char *prefill = "prefill buffers with known byte-value, default 0";
+       const char *latency = "output latency statistics";
+
        void *data = NULL, *metadata = NULL;
        int err = 0, wfd = STDIN_FILENO, fd;
        __u32 result;
        bool huge;
        const char *cmd_name = NULL;
+       struct timeval start_time, end_time;
 
        struct config {
                __u8  opcode;
@@ -5475,6 +5478,7 @@ static int passthru(int argc, char **argv, int ioctl_cmd, uint8_t cmd_type,
                int   read;
                int   write;
                __u8  prefill;
+               int   latency;
        };
 
        struct config cfg = {
@@ -5520,6 +5524,7 @@ static int passthru(int argc, char **argv, int ioctl_cmd, uint8_t cmd_type,
                OPT_FLAG("dry-run",      'd', &cfg.dry_run,      dry),
                OPT_FLAG("read",         'r', &cfg.read,         re),
                OPT_FLAG("write",        'w', &cfg.write,        wr),
+               OPT_FLAG("latency",      'T', &cfg.latency,      latency),
                OPT_END()
        };
 
@@ -5599,17 +5604,27 @@ static int passthru(int argc, char **argv, int ioctl_cmd, uint8_t cmd_type,
        if (cfg.dry_run)
                goto free_data;
 
+       gettimeofday(&start_time, NULL);
+
        err = nvme_passthru(fd, ioctl_cmd, cfg.opcode, cfg.flags, cfg.rsvd,
                                cfg.namespace_id, cfg.cdw2, cfg.cdw3, cfg.cdw10,
                                cfg.cdw11, cfg.cdw12, cfg.cdw13, cfg.cdw14, cfg.cdw15,
                                cfg.data_len, data, cfg.metadata_len, metadata,
                                cfg.timeout, &result);
+
+       gettimeofday(&end_time, NULL);
+       cmd_name = nvme_cmd_to_string(cmd_type, cfg.opcode);
+       if (cfg.latency)
+               printf("%s Command %s latency: %llu us\n",
+                       cmd_type ? "Admin": "IO",
+                       strcmp(cmd_name, "Unknown") ? cmd_name: "Vendor Specific",
+                       elapsed_utime(start_time, end_time));
+
        if (err < 0)
                perror("passthru");
        else if (err)
                nvme_show_status(err);
        else  {
-               cmd_name = nvme_cmd_to_string(cmd_type, cfg.opcode);
                fprintf(stderr, "%s Command %s is Success and result: 0x%08x\n",
                                cmd_type ? "Admin": "IO",
                                strcmp(cmd_name, "Unknown") ? cmd_name: "Vendor Specific",