netdev - [PATCH ethtool-next v3] netlink: tsinfo: add statistics support

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Message-ID: <20240508042418.42260-1-rrameshbabu@nvidia.com>
Date: Tue,  7 May 2024 21:24:12 -0700
From: Rahul Rameshbabu <rrameshbabu@...dia.com>
To: netdev@...r.kernel.org
Cc: cjubran@...dia.com,
	cratiu@...dia.com,
	davem@...emloft.net,
	edumazet@...gle.com,
	gal@...dia.com,
	jacob.e.keller@...el.com,
	kuba@...nel.org,
	mkubecek@...e.cz,
	pabeni@...hat.com,
	rrameshbabu@...dia.com,
	saeedm@...dia.com,
	tariqt@...dia.com,
	vadim.fedorenko@...ux.dev,
	wintera@...ux.ibm.com
Subject: [PATCH ethtool-next v3] netlink: tsinfo: add statistics support

If stats flag is present, report back statistics for tsinfo if the netlink
response body contains statistics information.

Link: https://lore.kernel.org/netdev/20240403212931.128541-1-rrameshbabu@nvidia.com/
Signed-off-by: Rahul Rameshbabu <rrameshbabu@...dia.com>
Reviewed-by: Carolina Jubran <cjubran@...dia.com>
Reviewed-by: Cosmin Ratiu <cratiu@...dia.com>
---

Notes:
    Changes:
    
      v1->v2:
        - Refactored logic based on a suggestion from Jakub Kicinski
          <kuba@...nel.org>.
      v2->v3:
        - Dropped previous uapi header update by rebasing the next branch with
          the latest changes.
    
    Links:
    
      - https://lore.kernel.org/netdev/20240417203836.113377-1-rrameshbabu@nvidia.com/
      - https://lore.kernel.org/netdev/20240416203723.104062-1-rrameshbabu@nvidia.com/

 netlink/tsinfo.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 64 insertions(+), 1 deletion(-)

diff --git a/netlink/tsinfo.c b/netlink/tsinfo.c
index c6571ff..4df4141 100644
--- a/netlink/tsinfo.c
+++ b/netlink/tsinfo.c
@@ -5,6 +5,7 @@
  */
 
 #include <errno.h>
+#include <inttypes.h>
 #include <string.h>
 #include <stdio.h>
 
@@ -15,6 +16,60 @@
 
 /* TSINFO_GET */
 
+static int tsinfo_show_stats(const struct nlattr *nest)
+{
+	const struct nlattr *tb[ETHTOOL_A_TS_STAT_MAX + 1] = {};
+	DECLARE_ATTR_TB_INFO(tb);
+	static const struct {
+		unsigned int attr;
+		char *name;
+	} stats[] = {
+		{ ETHTOOL_A_TS_STAT_TX_PKTS, "tx_pkts" },
+		{ ETHTOOL_A_TS_STAT_TX_LOST, "tx_lost" },
+		{ ETHTOOL_A_TS_STAT_TX_ERR, "tx_err" },
+	};
+	bool header = false;
+	unsigned int i;
+	__u64 val;
+	int ret;
+
+	ret = mnl_attr_parse_nested(nest, attr_cb, &tb_info);
+	if (ret < 0)
+		return ret;
+
+	open_json_object("statistics");
+	for (i = 0; i < ARRAY_SIZE(stats); i++) {
+		char fmt[64];
+
+		if (!tb[stats[i].attr])
+			continue;
+
+		if (!header && !is_json_context()) {
+			printf("Statistics:\n");
+			header = true;
+		}
+
+		if (!mnl_attr_validate(tb[stats[i].attr], MNL_TYPE_U32)) {
+			val = mnl_attr_get_u32(tb[stats[i].attr]);
+		} else if (!mnl_attr_validate(tb[stats[i].attr], MNL_TYPE_U64)) {
+			val = mnl_attr_get_u64(tb[stats[i].attr]);
+		} else {
+			fprintf(stderr, "malformed netlink message (statistic)\n");
+			goto err_close_stats;
+		}
+
+		snprintf(fmt, sizeof(fmt), "  %s: %%" PRIu64 "\n", stats[i].name);
+		print_u64(PRINT_ANY, stats[i].name, fmt, val);
+	}
+	close_json_object();
+
+	return 0;
+
+err_close_stats:
+	close_json_object();
+	return -1;
+}
+
 static void tsinfo_dump_cb(unsigned int idx, const char *name, bool val,
 			   void *data __maybe_unused)
 {
@@ -99,6 +154,12 @@ int tsinfo_reply_cb(const struct nlmsghdr *nlhdr, void *data)
 	if (ret < 0)
 		return err_ret;
 
+	if (tb[ETHTOOL_A_TSINFO_STATS]) {
+		ret = tsinfo_show_stats(tb[ETHTOOL_A_TSINFO_STATS]);
+		if (ret < 0)
+			return err_ret;
+	}
+
 	return MNL_CB_OK;
 }
 
@@ -106,6 +167,7 @@ int nl_tsinfo(struct cmd_context *ctx)
 {
 	struct nl_context *nlctx = ctx->nlctx;
 	struct nl_socket *nlsk = nlctx->ethnl_socket;
+	u32 flags;
 	int ret;
 
 	if (netlink_cmd_check(ctx, ETHTOOL_MSG_TSINFO_GET, true))
@@ -116,8 +178,9 @@ int nl_tsinfo(struct cmd_context *ctx)
 		return 1;
 	}
 
+	flags = get_stats_flag(nlctx, ETHTOOL_MSG_TSINFO_GET, ETHTOOL_A_TSINFO_HEADER);
 	ret = nlsock_prep_get_request(nlsk, ETHTOOL_MSG_TSINFO_GET,
-				      ETHTOOL_A_TSINFO_HEADER, 0);
+				      ETHTOOL_A_TSINFO_HEADER, flags);
 	if (ret < 0)
 		return ret;
 	return nlsock_send_get_request(nlsk, tsinfo_reply_cb);
-- 
2.42.0