nvmecontrol: Implement telemetry-log command.

This produces the same data as the Linux nvme-cli 'nvme telemetry-log'
command. It extracts the telemetry log from drive. This is a variable
length log, so we read the first page and find out how much of the log
to grab. There's 3 levels of details available, and we grab the level of
detail specified on the command line.

Sponsored by:		Netflix

sbin/nvmecontrol/Makefile

@@ -26,6 +26,7 @@ SRCS+=	reset.c
 SRCS+=	resv.c
 SRCS+=	sanitize.c
 SRCS+=  selftest.c
+SRCS+=	telemetry.c
 CFLAGS+= -I${SRCTOP}/lib/libnvmf
 MAN=	nvmecontrol.8
 LDFLAGS+= -rdynamic

sbin/nvmecontrol/nvmecontrol.8

@@ -33,7 +33,7 @@
 .\"
 .\" Author: Jim Harris <jimharris@FreeBSD.org>
 .\"
-.Dd May 3, 2024
+.Dd May 10, 2024
 .Dt NVMECONTROL 8
 .Os
 .Sh NAME
@@ -243,6 +243,11 @@
 .Op Fl Q Ar entries
 .Aq Ar device-id
 .Aq Ar address
+.Nm
+.Ic telemetry-log
+.Fl O Ar output-file
+.Op Fl d Ar data-area
+.Aq Ar device-id
 .Sh DESCRIPTION
 NVM Express (NVMe) is a storage protocol standard for SSDs and other
 high-speed storage devices over PCI Express as well as remote storage
@@ -806,6 +811,17 @@ The flags have the same meaning for the new association as described above
 for the
 .Cm connect
 command.
+.Ss telemetry-log
+Extract the telemetry log associated with 
+.Ar device-id ,
+using the specified parameters:
+.Bl -tag -width 6n
+.It Fl O Ar output-file
+Output file for the data.
+This parameter is mandatory.
+.It Fl d Ar data-area
+The data area is either 1, 2 or 3.
+.El
 .Sh DEVICE NAMES
 Where
 .Aq Ar namespace-id

sbin/nvmecontrol/telemetry.c

@@ -0,0 +1,182 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (C) 2024 Netflix, Inc
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/param.h>
+#include <sys/ioccom.h>
+
+#include <ctype.h>
+#include <err.h>
+#include <fcntl.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sysexits.h>
+#include <unistd.h>
+#include <sys/endian.h>
+
+#include "nvmecontrol.h"
+
+/* Tables for command line parsing */
+
+static cmd_fn_t telemetry_log;
+
+#define NONE 0xffffffffu
+static struct options {
+	const char *outfn;
+	const char *dev;
+	uint8_t da;
+} opt = {
+	.outfn = NULL,
+	.dev = NULL,
+	.da = 3,
+};
+
+static const struct opts telemetry_log_opts[] = {
+#define OPT(l, s, t, opt, addr, desc) { l, s, t, &opt.addr, desc }
+	OPT("output-file", 'O', arg_string, opt, outfn,
+	    "output file for telemetry data"),
+	OPT("data-area", 'd', arg_uint8, opt, da,
+	    "output file for telemetry data"),
+	{ NULL, 0, arg_none, NULL, NULL }
+};
+#undef OPT
+
+static const struct args telemetry_log_args[] = {
+	{ arg_string, &opt.dev, "<controller id|namespace id>" },
+	{ arg_none, NULL, NULL },
+};
+
+static struct cmd telemetry_log_cmd = {
+	.name = "telemetry-log",
+	.fn = telemetry_log,
+	.descr = "Retrieves telemetry log pages from drive",
+	.ctx_size = sizeof(opt),
+	.opts = telemetry_log_opts,
+	.args = telemetry_log_args,
+};
+
+CMD_COMMAND(telemetry_log_cmd);
+
+/* End of tables for command line parsing */
+
+/*
+ * Note: Even though this is a logpage, it's variable size and tricky
+ * to get with some weird options, so it's its own command.
+ */
+
+static void
+telemetry_log(const struct cmd *f, int argc, char *argv[])
+{
+	int				fd, fdout;
+	char				*path;
+	uint32_t			nsid;
+	uint64_t			size;
+	uint64_t			off;
+	uint32_t			chunk;
+	struct nvme_controller_data	cdata;
+	bool				can_telemetry;
+	struct nvme_telemetry_log_page  tlp, buf;
+
+	if (arg_parse(argc, argv, f))
+		return;
+	if (opt.da < 1 || opt.da > 3)
+		errx(EX_USAGE, "Data area %d is not in the range 1-3\n", opt.da);
+	if (opt.outfn == NULL)
+		errx(EX_USAGE, "No output file specified");
+
+	open_dev(opt.dev, &fd, 0, 1);
+	get_nsid(fd, &path, &nsid);
+	if (nsid == 0) {
+		nsid = NVME_GLOBAL_NAMESPACE_TAG;
+	} else {
+		close(fd);
+		open_dev(path, &fd, 0, 1);
+	}
+	free(path);
+
+	if (read_controller_data(fd, &cdata))
+		errx(EX_IOERR, "Identify request failed");
+
+	can_telemetry = NVMEV(NVME_CTRLR_DATA_LPA_TELEMETRY, cdata.lpa);
+	if (!can_telemetry)
+		errx(EX_UNAVAILABLE, "Drive does not support telemetry");
+	if (nsid != NVME_GLOBAL_NAMESPACE_TAG)
+		errx(EX_UNAVAILABLE, "Cannot operate on namespace");
+
+	fdout = open(opt.outfn, O_WRONLY | O_CREAT, 0664);
+	if (fdout == -1)
+		err(EX_IOERR, "Can't create %s", opt.outfn);
+
+	/* Read the log page */
+	size = sizeof(tlp);
+	off = 0;
+	read_logpage(fd, NVME_LOG_TELEMETRY_HOST_INITIATED, nsid, 0, 0, 0,
+	    off, 0, 0, 0, &tlp, size);
+	switch(opt.da) {
+	case 1:
+		size = letoh(tlp.da1_last);
+		break;
+	case 2:
+		size = letoh(tlp.da2_last);
+		break;
+	case 3:
+		size = letoh(tlp.da3_last);
+		break;
+	default:
+		errx(EX_USAGE, "Impossible data area %d", opt.da);
+	}
+	size = (size + 1) * 512; /* The count of additional pages */
+	chunk = 4096;
+
+	printf("Extracting %llu bytes\n", (unsigned long long)size);
+	do {
+		if (chunk > size)
+			chunk = size;
+		read_logpage(fd, NVME_LOG_TELEMETRY_HOST_INITIATED, nsid, 0, 0, 0,
+		    off, 0, 0, 0, &buf, chunk);
+		if (off == 0) {
+			/*
+			 * Sanity check to make sure that the generation number
+			 * didn't change between the two reads.
+			 */
+			if (tlp.hi_gen != buf.hi_gen)
+				warnx(
+				    "Generation number changed from %d to %d",
+				    tlp.hi_gen, buf.hi_gen);
+		}
+		if (write(fdout, &buf, chunk) != chunk)
+			err(EX_IOERR, "Error writing %s", opt.outfn);
+		off += chunk;
+		size -= chunk;
+	} while (size > 0);
+
+	close(fdout);
+	close(fd);
+	exit(0);
+}