iflib_link_state_change
iflib_link_state_change(ctx, LINK_STATE_UP,
iflib_link_state_change(ctx, LINK_STATE_DOWN, 0);
iflib_link_state_change(ctx, LINK_STATE_UP,
iflib_link_state_change(ctx, LINK_STATE_DOWN, 0);
iflib_link_state_change(ctx, LINK_STATE_UP, speed);
iflib_link_state_change(ctx, LINK_STATE_DOWN, speed);
void iflib_link_state_change(if_ctx_t ctx, int linkstate, uint64_t baudrate);