[dpdk-dev] [PATCH v2 1/2] eal: add uevent api for hot plug

[Thomas Monjalon]

Hi,

This is an interesting step for hotplug in DPDK.

28/06/2017 13:07, Jeff Guo:
> +       netlink_fd = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);

It is monitoring the whole system...

> +int
> +rte_uevent_get(int fd, struct rte_uevent *uevent)
> +{
> +       int ret;
> +       char buf[RTE_UEVENT_MSG_LEN];
> +
> +       memset(uevent, 0, sizeof(struct rte_uevent));
> +       memset(buf, 0, RTE_UEVENT_MSG_LEN);
> +
> +       ret = recv(fd, buf, RTE_UEVENT_MSG_LEN - 1, MSG_DONTWAIT);

... and it is read from this function called by one driver.
It cannot work without a global dispatch.

It must be a global mechanism, probably a service core.
The question is also to know whether it should be a mandatory
service in DPDK or an optional helper?