[dpdk-dev] [PATCH v6 1/2] eal: add uevent monitor for hot plug

Guo, Jia jia.guo at intel.com
Mon Dec 25 09:30:46 CET 2017



On 11/2/2017 5:41 AM, Stephen Hemminger wrote:
> On Thu,  2 Nov 2017 04:16:44 +0800
> Jeff Guo <jia.guo at intel.com> wrote:
>
>> +
>> +static int
>> +dev_uev_parse(const char *buf, struct rte_eal_uevent *event)
>> +{
>> +	char action[RTE_EAL_UEVENT_MSG_LEN];
>> +	char subsystem[RTE_EAL_UEVENT_MSG_LEN];
>> +	char dev_path[RTE_EAL_UEVENT_MSG_LEN];
>> +	char pci_slot_name[RTE_EAL_UEVENT_MSG_LEN];
>> +	int i = 0;
>> +
>> +	memset(action, 0, RTE_EAL_UEVENT_MSG_LEN);
>> +	memset(subsystem, 0, RTE_EAL_UEVENT_MSG_LEN);
>> +	memset(dev_path, 0, RTE_EAL_UEVENT_MSG_LEN);
>> +	memset(pci_slot_name, 0, RTE_EAL_UEVENT_MSG_LEN);
>> +
>> +	while (i < RTE_EAL_UEVENT_MSG_LEN) {
> Might be simpler, safer, clearer to use rte_strsplit here.
>
> And then have a table of fields rather than open coding the parsing.
>
i think your  point must be make sense , but it hardly use rte_strsplit 
here , because the tokens which need to parse is splited by '\0', even 
more multi adjacent '\0' in the buf witch come from the uevent massage.
>> f+		for (; i < RTE_EAL_UEVENT_MSG_LEN; i++) {
>> +			if (*buf)
>> +				break;
>> +			buf++;
>> +		}
>> +		if (!strncmp(buf, "libudev", 7)) {
>> +			buf += 7;
>> +			i += 7;
>> +			event->group = UEV_MONITOR_UDEV;
>> +		}
>> +		if (!strncmp(buf, "ACTION=", 7)) {
>> +			buf += 7;
>> +			i += 7;
>> +			snprintf(action, sizeof(action), "%s", buf);
>> +		} else if (!strncmp(buf, "DEVPATH=", 8)) {
>> +			buf += 8;
>> +			i += 8;
>> +			snprintf(dev_path, sizeof(dev_path), "%s", buf);
>> +		} else if (!strncmp(buf, "SUBSYSTEM=", 10)) {
>> +			buf += 10;
>> +			i += 10;
>> +			snprintf(subsystem, sizeof(subsystem), "%s", buf);
>> +		} else if (!strncmp(buf, "PCI_SLOT_NAME=", 14)) {
>> +			buf += 14;
>> +			i += 14;
>> +			snprintf(pci_slot_name, sizeof(subsystem), "%s", buf);
>> +		}
>> +		for (; i < RTE_EAL_UEVENT_MSG_LEN; i++) {
>> +			if (*buf == '\0')
>> +				break;
>> +			buf++;
>> +		}
>> +	}
>> +
>> +	if (!strncmp(subsystem, "pci", 3))
>> +		event->subsystem = UEV_SUBSYSTEM_PCI;
>> +	if (!strncmp(action, "add", 3))
>> +		event->type = RTE_EAL_DEV_EVENT_ADD;
>> +	if (!strncmp(action, "remove", 6))
>> +		event->type = RTE_EAL_DEV_EVENT_REMOVE;
>> +	event->devname = pci_slot_name;
>> +
>> +	return 0;
> Function always returns 0, why is it not void?



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