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From: Justin Iurman <justin.iurman@uliege.be>
To: David Ahern <dsahern@gmail.com>
Cc: netdev@vger.kernel.org, stephen@networkplumber.org
Subject: Re: [PATCH iproute2-next v2 1/3] Add, show, link, remove IOAM namespaces and schemas
Date: Thu, 29 Jul 2021 11:51:35 +0200 (CEST)	[thread overview]
Message-ID: <506325411.28069607.1627552295593.JavaMail.zimbra@uliege.be> (raw)
In-Reply-To: <54514656-7e71-6071-a5b2-d6aa8eed6275@gmail.com>

Hi David,

>> +static void print_schema(struct rtattr *attrs[])
>> +{
>> +	__u8 data[IOAM6_MAX_SCHEMA_DATA_LEN + 1];
>> +	int len;
>> +
>> +	print_uint(PRINT_ANY, "schema", "schema %u",
>> +		   rta_getattr_u32(attrs[IOAM6_ATTR_SC_ID]));
>> +
>> +	if (attrs[IOAM6_ATTR_NS_ID])
>> +		print_uint(PRINT_ANY, "namespace", " [namespace %u]",
>> +			   rta_getattr_u16(attrs[IOAM6_ATTR_NS_ID]));
>> +
>> +	len = RTA_PAYLOAD(attrs[IOAM6_ATTR_SC_DATA]);
>> +	memcpy(data, RTA_DATA(attrs[IOAM6_ATTR_SC_DATA]), len);
>> +	data[len] = '\0';
>> +
>> +	print_string(PRINT_ANY, "data", ", data \"%s\"", (const char *)data);
> 
> The attribute descriptions shows this as binary data, not a string.

Indeed. Maybe should I print it as hex... What do you think is more appropriate for this?


>> +static int ioam6_do_cmd(void)
>> +{
>> +	IOAM6_REQUEST(req, 1036, opts.cmd, NLM_F_REQUEST);
>> +	int dump = 0;
>> +
>> +	if (genl_family < 0) {
>> +		if (rtnl_open_byproto(&grth, 0, NETLINK_GENERIC) < 0) {
>> +			fprintf(stderr, "Cannot open generic netlink socket\n");
>> +			exit(1);
>> +		}
>> +		genl_family = genl_resolve_family(&grth, IOAM6_GENL_NAME);
> 
> The above 2 calls can be done with genl_init_handle.

Didn't know that one, thx for the pointer.


>> +int do_ioam6(int argc, char **argv)
>> +{
>> +	bool maybe_wide = false;
>> +
>> +	if (argc < 1 || matches(*argv, "help") == 0)
>> +		usage();
>> +
>> +	memset(&opts, 0, sizeof(opts));
>> +
>> +	if (matches(*argv, "namespace") == 0) {
> 
> matches has been shown to be quite frail. Convenient for shorthand
> typing commands, but frail in the big picture. We should stop using it -
> especially for new commands.

Sure. What do you suggest as an alternative?

  reply	other threads:[~2021-07-29  9:51 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-24 17:21 [PATCH iproute2-next v2 0/3] Provide support for IOAM Justin Iurman
2021-07-24 17:21 ` [PATCH iproute2-next v2 1/3] Add, show, link, remove IOAM namespaces and schemas Justin Iurman
2021-07-29  2:41   ` David Ahern
2021-07-29  9:51     ` Justin Iurman [this message]
2021-07-29 14:32       ` David Ahern
2021-07-29 16:41         ` Justin Iurman
2021-07-30 14:39           ` David Ahern
2021-08-11  3:47             ` Stephen Hemminger
2021-08-11  3:46   ` Stephen Hemminger
2021-07-24 17:21 ` [PATCH iproute2-next v2 2/3] New IOAM6 encap type for routes Justin Iurman
2021-07-27 13:42   ` Justin Iurman
2021-07-29  2:44     ` David Ahern
2021-07-24 17:21 ` [PATCH iproute2-next v2 3/3] IOAM man8 Justin Iurman

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