[dpdk-dev] Questions about rte_eth_link_speed_to_str API
Min Hu (Connor)
humin29 at huawei.com
Tue Sep 14 15:04:28 CEST 2021
Thanks Stephen,
While I think this option is more clear and simple:
+const char *
+rte_eth_link_speed_to_str(uint32_t link_speed)
+{
+#define SPEED_STRING_LEN 16
+ static char name[SPEED_STRING_LEN];
+
+ if (link_speed == ETH_SPEED_NUM_NONE)
+ return "None";
+ if (link_speed == ETH_SPEED_NUM_UNKNOWN)
+ return "Unknown";
+ if (link_speed < ETH_SPEED_NUM_1G) {
+ snprintf(name, sizeof(name), "%u Mbps", link_speed);
+ } else if (link_speed % ETH_SPEED_NUM_1G != 0){
+ snprintf(name, sizeof(name), "%.1f Gbps",
+ (double)link_speed / ETH_SPEED_NUM_1G);
+ } else {
+ snprintf(name, sizeof(name), "%u Gbps",
+ link_speed / ETH_SPEED_NUM_1G);
+ }
+
+ return (const char *)name;
+}
How about any others' opinions, thanks.
在 2021/9/14 14:59, Stephen Hemminger 写道:
> On Tue, 14 Sep 2021 11:25:44 +0800
> "Min Hu (Connor)" <humin29 at huawei.com> wrote:
>
>> Thanks Thomas,
>> I am not sure if we need to print combined slaves speed.
>> How about others' opinion ? @all
>>
>> BTW, If yes, one possible option may be like that:
>> +const char *
>> +rte_eth_link_speed_to_str(uint32_t link_speed)
>> +{
>> + char name[16];
>> +
>> + if (link_speed == ETH_SPEED_NUM_NONE)
>> + return "None";
>> + if (link_speed == ETH_SPEED_NUM_NONE)
>> + return "Unknown";
>> + if (link_speed < ETH_SPEED_NUM_1G) {
>> + snprintf(name, sizeof(name), "%u Mbps", link_speed);
>> + } else {
>> + snprintf(name, sizeof(name), "%u Mbps",
>> + link_speed / ETH_SPEED_NUM_1G);
>> + }
>> +
>> + return name;
>> +}
>>
>> But the float value is difficult to handle, like 2.5 Gbps for show. Any
>> advices?
>>
>> 在 2021/9/13 18:26, Thomas Monjalon 写道:
>>> 13/09/2021 10:45, Min Hu (Connor):
>>>> Hi all,
>>>> I have questions about rte_eth_link_speed_to_str API.
>>>> The API converts link speed to string for display, But it only
>>>> supports the following speeds, like that:
>>>> case ETH_SPEED_NUM_NONE: return "None";
>>>> case ETH_SPEED_NUM_10M: return "10 Mbps";
>>>> case ETH_SPEED_NUM_100M: return "100 Mbps";
>>>> case ETH_SPEED_NUM_1G: return "1 Gbps";
>>>> case ETH_SPEED_NUM_2_5G: return "2.5 Gbps";
>>>> case ETH_SPEED_NUM_5G: return "5 Gbps";
>>>> case ETH_SPEED_NUM_10G: return "10 Gbps";
>>>> case ETH_SPEED_NUM_20G: return "20 Gbps";
>>>> case ETH_SPEED_NUM_25G: return "25 Gbps";
>>>> case ETH_SPEED_NUM_40G: return "40 Gbps";
>>>> case ETH_SPEED_NUM_50G: return "50 Gbps";
>>>> case ETH_SPEED_NUM_56G: return "56 Gbps";
>>>> case ETH_SPEED_NUM_100G: return "100 Gbps";
>>>> case ETH_SPEED_NUM_200G: return "200 Gbps";
>>>> case ETH_SPEED_NUM_UNKNOWN: return "Unknown";
>>>> default: return "Invalid";
>>>>
>>>> In some cases, like bonding, for example, three slaves which
>>>> link speed are 10Gbps, so link speed of bonding port will be
>>>> 30Gbps, but it shows "Invalid".
>>>>
>>>> Is this reasonable? any comments will be welcome.
>>>
>>> Is it meaningful to print combined slaves speed?
>>> If yes, we can do better then this fixed switch/case logic,
>>> it shouldn't be too hard given it is a standard uint32_t value.
>>>
>>>
>>> .
>>>
>
> Since all the values are encoded numerically do some math.
> This is what iproute2 has evolved to doing..
>
>
> int print_color_rate(bool use_iec, enum output_type type, enum color_attr color,
> const char *key, const char *fmt, unsigned long long rate)
> {
> unsigned long kilo = use_iec ? 1024 : 1000;
> const char *str = use_iec ? "i" : "";
> static char *units[5] = {"", "K", "M", "G", "T"};
> char *buf;
> int rc;
> int i;
>
> if (_IS_JSON_CONTEXT(type))
> return print_color_lluint(type, color, key, "%llu", rate);
>
> rate <<= 3; /* bytes/sec -> bits/sec */
>
> for (i = 0; i < ARRAY_SIZE(units) - 1; i++) {
> if (rate < kilo)
> break;
> if (((rate % kilo) != 0) && rate < 1000*kilo)
> break;
> rate /= kilo;
> }
>
> rc = asprintf(&buf, "%.0f%s%sbit", (double)rate, units[i],
> i > 0 ? str : "");
> if (rc < 0)
> return -1;
>
> rc = print_color_string(type, color, key, fmt, buf);
> free(buf);
> }
>
>
> .
>
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