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Message-Id: <20200701010743.730606-5-andrew@lunn.ch>
Date: Wed, 1 Jul 2020 03:07:41 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Michal Kubecek <mkubecek@...e.cz>
Cc: netdev <netdev@...r.kernel.org>, Chris Healy <cphealy@...il.com>,
Andrew Lunn <andrew@...n.ch>
Subject: [PATCH ethtool v4 4/6] Add --json command line argument parsing
Allow --json to be passed as an option to select JSON output. The
option is handled in the same way as --debug, setting a variable in
the command context, which can then later be used per option to select
JSON outputters.
Signed-off-by: Andrew Lunn <andrew@...n.ch>
v3:
Make use of json_print to simplify the code.
---
ethtool.c | 33 ++++++++++------
internal.h | 4 ++
netlink/cable_test.c | 92 ++++++++++++++++++++++++++++++--------------
3 files changed, 90 insertions(+), 39 deletions(-)
diff --git a/ethtool.c b/ethtool.c
index a6bb9ac..ed132d4 100644
--- a/ethtool.c
+++ b/ethtool.c
@@ -5518,10 +5518,10 @@ static int show_usage(struct cmd_context *ctx maybe_unused)
fprintf(stdout, PACKAGE " version " VERSION "\n");
fprintf(stdout,
"Usage:\n"
- " ethtool [ --debug MASK ] DEVNAME\t"
+ " ethtool [ --debug MASK ][ --json ] DEVNAME\t"
"Display standard information about device\n");
for (i = 0; args[i].opts; i++) {
- fputs(" ethtool [ --debug MASK ] ", stdout);
+ fputs(" ethtool [ --debug MASK ][ --json ] ", stdout);
fprintf(stdout, "%s %s\t%s\n",
args[i].opts,
args[i].no_dev ? "\t" : "DEVNAME",
@@ -5530,6 +5530,7 @@ static int show_usage(struct cmd_context *ctx maybe_unused)
fputs(args[i].xhelp, stdout);
}
nl_monitor_usage();
+ fprintf(stdout, "Not all options support JSON output\n");
return 0;
}
@@ -5768,17 +5769,27 @@ int main(int argc, char **argp)
argp++;
argc--;
- if (*argp && !strcmp(*argp, "--debug")) {
- char *eptr;
+ while (true) {
+ if (*argp && !strcmp(*argp, "--debug")) {
+ char *eptr;
- if (argc < 2)
- exit_bad_args();
- ctx.debug = strtoul(argp[1], &eptr, 0);
- if (!argp[1][0] || *eptr)
- exit_bad_args();
+ if (argc < 2)
+ exit_bad_args();
+ ctx.debug = strtoul(argp[1], &eptr, 0);
+ if (!argp[1][0] || *eptr)
+ exit_bad_args();
- argp += 2;
- argc -= 2;
+ argp += 2;
+ argc -= 2;
+ continue;
+ }
+ if (*argp && !strcmp(*argp, "--json")) {
+ ctx.json = true;
+ argp += 1;
+ argc -= 1;
+ continue;
+ }
+ break;
}
if (*argp && !strcmp(*argp, "--monitor")) {
ctx.argp = ++argp;
diff --git a/internal.h b/internal.h
index edb07bd..45b63b7 100644
--- a/internal.h
+++ b/internal.h
@@ -23,6 +23,9 @@
#include <sys/ioctl.h>
#include <net/if.h>
+#include "json_writer.h"
+#include "json_print.h"
+
#define maybe_unused __attribute__((__unused__))
/* internal for netlink interface */
@@ -221,6 +224,7 @@ struct cmd_context {
int argc; /* number of arguments to the sub-command */
char **argp; /* arguments to the sub-command */
unsigned long debug; /* debugging mask */
+ bool json; /* Output JSON, if supported */
#ifdef ETHTOOL_ENABLE_NETLINK
struct nl_context *nlctx; /* netlink context (opaque) */
#endif
diff --git a/netlink/cable_test.c b/netlink/cable_test.c
index 1672f55..c2b9c97 100644
--- a/netlink/cable_test.c
+++ b/netlink/cable_test.c
@@ -88,7 +88,8 @@ static char *nl_pair2txt(uint8_t pair)
}
}
-static int nl_cable_test_ntf_attr(struct nlattr *evattr)
+static int nl_cable_test_ntf_attr(struct nlattr *evattr,
+ struct nl_context *nlctx)
{
unsigned int cm;
uint16_t code;
@@ -101,29 +102,34 @@ static int nl_cable_test_ntf_attr(struct nlattr *evattr)
if (ret < 0)
return ret;
- printf("Pair: %s, result: %s\n", nl_pair2txt(pair),
- nl_code2txt(code));
+ open_json_object(NULL);
+ print_string(PRINT_ANY, "pair", "%s ", nl_pair2txt(pair));
+ print_string(PRINT_ANY, "code", "code %s\n", nl_code2txt(code));
+ close_json_object();
break;
case ETHTOOL_A_CABLE_NEST_FAULT_LENGTH:
ret = nl_get_cable_test_fault_length(evattr, &pair, &cm);
if (ret < 0)
return ret;
-
- printf("Pair: %s, fault length: %0.2fm\n",
- nl_pair2txt(pair), (float)cm / 100);
+ open_json_object(NULL);
+ print_string(PRINT_ANY, "pair", "%s, ", nl_pair2txt(pair));
+ print_float(PRINT_ANY, "length", "fault length: %0.2fm\n",
+ (float)cm / 100);
+ close_json_object();
break;
}
return 0;
}
-static void cable_test_ntf_nest(const struct nlattr *nest)
+static void cable_test_ntf_nest(const struct nlattr *nest,
+ struct nl_context *nlctx)
{
struct nlattr *pos;
int ret;
mnl_attr_for_each_nested(pos, nest) {
- ret = nl_cable_test_ntf_attr(pos);
+ ret = nl_cable_test_ntf_attr(pos, nlctx);
if (ret < 0)
return;
}
@@ -160,19 +166,21 @@ static int cable_test_ntf_stop_cb(const struct nlmsghdr *nlhdr, void *data)
switch (status) {
case ETHTOOL_A_CABLE_TEST_NTF_STATUS_STARTED:
- printf("Cable test started for device %s.\n",
- nlctx->devname);
+ print_string(PRINT_FP, "status",
+ "Cable test started for device %s.\n",
+ nlctx->devname);
break;
case ETHTOOL_A_CABLE_TEST_NTF_STATUS_COMPLETED:
- printf("Cable test completed for device %s.\n",
- nlctx->devname);
+ print_string(PRINT_FP, "status",
+ "Cable test completed for device %s.\n",
+ nlctx->devname);
break;
default:
break;
}
if (tb[ETHTOOL_A_CABLE_TEST_NTF_NEST])
- cable_test_ntf_nest(tb[ETHTOOL_A_CABLE_TEST_NTF_NEST]);
+ cable_test_ntf_nest(tb[ETHTOOL_A_CABLE_TEST_NTF_NEST], nlctx);
if (status == ETHTOOL_A_CABLE_TEST_NTF_STATUS_COMPLETED) {
if (ctctx)
@@ -261,8 +269,14 @@ int nl_cable_test(struct cmd_context *ctx)
ret = nlsock_sendmsg(nlsk, NULL);
if (ret < 0)
fprintf(stderr, "Cannot start cable test\n");
- else
+ else {
+ new_json_obj(ctx->json);
+
ret = nl_cable_test_process_results(ctx);
+
+ delete_json_obj();
+ }
+
return ret;
}
@@ -325,7 +339,8 @@ static int nl_get_cable_test_tdr_step(const struct nlattr *nest,
return 0;
}
-static int nl_cable_test_tdr_ntf_attr(struct nlattr *evattr)
+static int nl_cable_test_tdr_ntf_attr(struct nlattr *evattr,
+ struct nl_context *nlctx)
{
uint32_t first, last, step;
uint8_t pair;
@@ -340,7 +355,10 @@ static int nl_cable_test_tdr_ntf_attr(struct nlattr *evattr)
if (ret < 0)
return ret;
- printf("Pair: %s, amplitude %4d\n", nl_pair2txt(pair), mV);
+ open_json_object(NULL);
+ print_string(PRINT_ANY, "pair", "%s ", nl_pair2txt(pair));
+ print_uint(PRINT_ANY, "amplitude", "Amplitude %4d\n", mV);
+ close_json_object();
break;
}
case ETHTOOL_A_CABLE_TDR_NEST_PULSE: {
@@ -350,7 +368,9 @@ static int nl_cable_test_tdr_ntf_attr(struct nlattr *evattr)
if (ret < 0)
return ret;
- printf("TDR pulse %dmV\n", mV);
+ open_json_object(NULL);
+ print_uint(PRINT_ANY, "pulse", "TDR Pulse %dmV\n", mV);
+ close_json_object();
break;
}
case ETHTOOL_A_CABLE_TDR_NEST_STEP:
@@ -358,21 +378,27 @@ static int nl_cable_test_tdr_ntf_attr(struct nlattr *evattr)
if (ret < 0)
return ret;
- printf("Step configuration, %.2f-%.2f meters in %.2fm steps\n",
- (float)first / 100, (float)last / 100,
- (float)step / 100);
+ open_json_object(NULL);
+ print_float(PRINT_ANY, "first", "Step configuration: %.2f-",
+ (float)first / 100);
+ print_float(PRINT_ANY, "last", "%.2f meters ",
+ (float)last / 100);
+ print_float(PRINT_ANY, "step", "in %.2fm steps\n",
+ (float)step / 100);
+ close_json_object();
break;
}
return 0;
}
-static void cable_test_tdr_ntf_nest(const struct nlattr *nest)
+static void cable_test_tdr_ntf_nest(const struct nlattr *nest,
+ struct nl_context *nlctx)
{
struct nlattr *pos;
int ret;
mnl_attr_for_each_nested(pos, nest) {
- ret = nl_cable_test_tdr_ntf_attr(pos);
+ ret = nl_cable_test_tdr_ntf_attr(pos, nlctx);
if (ret < 0)
return;
}
@@ -387,6 +413,7 @@ int cable_test_tdr_ntf_stop_cb(const struct nlmsghdr *nlhdr, void *data)
u8 status = ETHTOOL_A_CABLE_TEST_NTF_STATUS_UNSPEC;
struct cable_test_context *ctctx;
struct nl_context *nlctx = data;
+
DECLARE_ATTR_TB_INFO(tb);
bool silent;
int err_ret;
@@ -409,19 +436,22 @@ int cable_test_tdr_ntf_stop_cb(const struct nlmsghdr *nlhdr, void *data)
switch (status) {
case ETHTOOL_A_CABLE_TEST_NTF_STATUS_STARTED:
- printf("Cable test TDR started for device %s.\n",
- nlctx->devname);
+ print_string(PRINT_FP, "status",
+ "Cable test TDR started for device %s.\n",
+ nlctx->devname);
break;
case ETHTOOL_A_CABLE_TEST_NTF_STATUS_COMPLETED:
- printf("Cable test TDR completed for device %s.\n",
- nlctx->devname);
+ print_string(PRINT_FP, "status",
+ "Cable test TDR completed for device %s.\n",
+ nlctx->devname);
break;
default:
break;
}
if (tb[ETHTOOL_A_CABLE_TEST_TDR_NTF_NEST])
- cable_test_tdr_ntf_nest(tb[ETHTOOL_A_CABLE_TEST_TDR_NTF_NEST]);
+ cable_test_tdr_ntf_nest(tb[ETHTOOL_A_CABLE_TEST_TDR_NTF_NEST],
+ nlctx);
if (status == ETHTOOL_A_CABLE_TEST_NTF_STATUS_COMPLETED) {
if (ctctx)
@@ -556,7 +586,13 @@ int nl_cable_test_tdr(struct cmd_context *ctx)
ret = nlsock_sendmsg(nlsk, NULL);
if (ret < 0)
fprintf(stderr, "Cannot start cable test TDR\n");
- else
+ else {
+ new_json_obj(ctx->json);
+
ret = nl_cable_test_tdr_process_results(ctx);
+
+ delete_json_obj();
+ }
+
return ret;
}
--
2.27.0
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