[dpdk-dev] [PATCH v3 4/4] vfio: enable vfio hotplug by req notifier handler
Burakov, Anatoly
anatoly.burakov at intel.com
Tue Oct 2 16:15:00 CEST 2018
On 02-Oct-18 1:58 PM, Jeff Guo wrote:
> When device is be hot-unplugged, the vfio kernel module will sent req
> notifier to request user space to release the allocated resources at
> first. After that, vfio kernel module will detect the device disappear,
> and then delete the device in kernel.
>
> This patch aim to add req notifier processing to enable hotplug for vfio.
> By enable the req notifier monitoring and register the notifier callback,
> when device be hot-unplugged, the hot-unplug handler will be called to
> process hotplug for vfio.
>
> Signed-off-by: Jeff Guo <jia.guo at intel.com>
> ---
> v3->v2:
> change some code style and typo.
> ---
<snip>
> +/* enable notifier (only enable req now) */
> +static int
> +pci_vfio_enable_notifier(struct rte_pci_device *dev, int vfio_dev_fd)
> +{
> + int ret;
> + int fd = -1;
> +
> + /* set up an eventfd for req notifier */
> + fd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
> + if (fd < 0) {
> + RTE_LOG(ERR, EAL, "Cannot set up eventfd, error %i (%s)\n",
> + errno, strerror(errno));
> + return -1;
> + }
> +
> + dev->req_notifier_handler.fd = fd;
> + dev->req_notifier_handler.type = RTE_INTR_HANDLE_VFIO_REQ;
> + dev->req_notifier_handler.vfio_dev_fd = vfio_dev_fd;
> + ret = rte_intr_callback_register(&dev->req_notifier_handler,
> + pci_vfio_req_handler,
> + (void *)&dev->device);
> + if (ret) {
> + RTE_LOG(ERR, EAL, "Fail to register req notifier handler.\n");
> + goto error;
At this point (and further down as well), if we go to error, we've
already modified the req_notifier_handler data. Do we need to overwrite
it? Maybe just do these operations on a local struct, and then do a
memcpy into dev->req_notifier_handler on success?
--
Thanks,
Anatoly
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