Re: [PATCH net-next v3 2/2] netcons: Add udp send fail statistics to netconsole

Hello Maksym,

Thanks for the patch, it is looking good. A few nits:

On Thu, Sep 12, 2024 at 10:28:52AM -0700, Maksym Kutsevol wrote:

+/**
+ * netpoll_send_udp_count_errs - Wrapper for netpoll_send_udp that counts errors
+ * @nt: target to send message to
+ * @msg: message to send
+ * @len: length of message
+ *
+ * Calls netpoll_send_udp and classifies the return value. If an error
+ * occurred it increments statistics in nt->stats accordingly.
+ * Only calls netpoll_send_udp if CONFIG_NETCONSOLE_DYNAMIC is disabled.
+ */
+static void netpoll_send_udp_count_errs(struct netconsole_target *nt, const char *msg, int len)
+{
+	int result = netpoll_send_udp(&nt->np, msg, len);

Would you get a "variable defined but not used" type of eror if
CONFIG_NETCONSOLE_DYNAMIC is disabled?

+
+	if (IS_ENABLED(CONFIG_NETCONSOLE_DYNAMIC)) {
+		if (result == NET_XMIT_DROP) {
+			u64_stats_update_begin(&nt->stats.syncp);
+			u64_stats_inc(&nt->stats.xmit_drop_count);
+			u64_stats_update_end(&nt->stats.syncp);
+		} else if (result == -ENOMEM) {
+			u64_stats_update_begin(&nt->stats.syncp);
+			u64_stats_inc(&nt->stats.enomem_count);
+			u64_stats_update_end(&nt->stats.syncp);
+		}
+	}

Would this look better?

	if (IS_ENABLED(CONFIG_NETCONSOLE_DYNAMIC)) {
		u64_stats_update_begin(&nt->stats.syncp);

		if (result == NET_XMIT_DROP)
			u64_stats_inc(&nt->stats.xmit_drop_count);
		else if (result == -ENOMEM)
			u64_stats_inc(&nt->stats.enomem_count);
		else
			WARN_ONCE(true, "invalid result: %d\n", result)

		u64_stats_update_end(&nt->stats.syncp);
	}

Thanks
--breno