netdev - Re: [PATCH iproute2 2/2] netem: add 64bit rates support

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Date:	Wed, 15 Jan 2014 07:56:07 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Yang Yingliang <yangyingliang@...wei.com>
Cc:	stephen@...workplumber.org, netdev@...r.kernel.org
Subject: Re: [PATCH iproute2 2/2] netem: add 64bit rates support

On Wed, 2014-01-15 at 17:42 +0800, Yang Yingliang wrote:
> netem support 64bit rates start from linux-3.13.
> Add 64bit rates support in tc tools.
> 
> tc qdisc show dev eth0
> qdisc netem 1: dev eth4 root refcnt 2 limit 1000 rate 35Gbit
> 
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
>  tc/q_netem.c | 29 ++++++++++++++++++++++++-----
>  1 file changed, 24 insertions(+), 5 deletions(-)
> 
> diff --git a/tc/q_netem.c b/tc/q_netem.c
> index 9dd8712..1312eb5 100644
> --- a/tc/q_netem.c
> +++ b/tc/q_netem.c
> @@ -183,6 +183,7 @@ static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv,
>  	__s16 *dist_data = NULL;
>  	__u16 loss_type = NETEM_LOSS_UNSPEC;
>  	int present[__TCA_NETEM_MAX];
> +	__u64 rate64 = 0;
>  
>  	memset(&cor, 0, sizeof(cor));
>  	memset(&reorder, 0, sizeof(reorder));
> @@ -391,7 +392,7 @@ static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv,
>  		} else if (matches(*argv, "rate") == 0) {
>  			++present[TCA_NETEM_RATE];
>  			NEXT_ARG();
> -			if (get_rate(&rate.rate, *argv)) {
> +			if (get_rate64(&rate64, *argv)) {
>  				explain1("rate");
>  				return -1;
>  			}
> @@ -496,9 +497,18 @@ static int netem_parse_opt(struct qdisc_util *qu, int argc, char **argv,
>  		addattr_nest_end(n, start);
>  	}
>  
> -	if (present[TCA_NETEM_RATE] &&
> -	    addattr_l(n, 1024, TCA_NETEM_RATE, &rate, sizeof(rate)) < 0)
> -		return -1;
> +	if (present[TCA_NETEM_RATE]) {
> +		if (rate64 >= (1ULL << 32)) {
> +			if (addattr_l(n, 1024,
> +				      TCA_NETEM_RATE64, &rate64, sizeof(rate64)) < 0)
> +				return -1;
> +			rate.rate = ~0U;
> +		} else {
> +			rate.rate = rate64;
> +		}
> +		if (addattr_l(n, 1024, TCA_NETEM_RATE, &rate, sizeof(rate)) < 0)
> +			return -1;
> +	}
>  
>  	if (dist_data) {
>  		if (addattr_l(n, MAX_DIST * sizeof(dist_data[0]),
> @@ -522,6 +532,7 @@ static int netem_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
>  	struct tc_netem_qopt qopt;
>  	const struct tc_netem_rate *rate = NULL;
>  	int len = RTA_PAYLOAD(opt) - sizeof(qopt);
> +	__u64 *rate64 = NULL;

__u64 rate64 = 0;

>  	SPRINT_BUF(b1);
>  
>  	if (opt == NULL)
> @@ -572,6 +583,11 @@ static int netem_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
>  				return -1;
>  			ecn = RTA_DATA(tb[TCA_NETEM_ECN]);
>  		}
> +		if (tb[TCA_NETEM_RATE64]) {
> +			if (RTA_PAYLOAD(tb[TCA_NETEM_RATE64]) < sizeof(*rate64))
> +				return -1;
> +			rate64 = RTA_DATA(tb[TCA_NETEM_RATE64]);

rate64 = rta_getattr_u64(tb[TCA_NETEM_RATE64]);

> +		}
>  	}
>  
>  	fprintf(f, "limit %d", qopt.limit);
> @@ -632,7 +648,10 @@ static int netem_print_opt(struct qdisc_util *qu, FILE *f, struct rtattr *opt)
>  	}
>  
>  	if (rate && rate->rate) {
> -		fprintf(f, " rate %s", sprint_rate(rate->rate, b1));
> +		if (rate64)
> +			fprintf(f, " rate %s", sprint_rate(rate64, b1));
> +		else
> +			fprintf(f, " rate %s", sprint_rate(rate->rate, b1));
>  		if (rate->packet_overhead)
>  			fprintf(f, " packetoverhead %d", rate->packet_overhead);
>  		if (rate->cell_size)


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