[PATCH WIP/RFC v2 6/6] nvme-rdma: use ib_client API to detect device removal
Christoph Hellwig
hch at lst.de
Tue Aug 30 00:06:14 PDT 2016
> +static void nvme_rdma_add_one(struct ib_device *ib_device);
> +static void nvme_rdma_remove_one(struct ib_device *ib_device,
> + void *client_data);
Can we avoid the forward declarations?
> +static void nvme_rdma_add_one(struct ib_device *ib_device)
> +{
> + /* devices are added dynamically as targets use them */
> +}
Is the add callback mandatory in the core? Would be nice if we could
fix that up in an incremental patch.
> +static void nvme_rdma_remove_one(struct ib_device *ib_device, void *client_data)
> +{
> + struct nvme_rdma_ctrl *ctrl, *tmp;
> +
> + pr_info("Removing resources for device %s\n", ib_device->name);
> +
> + mutex_lock(&nvme_rdma_ctrl_mutex);
> + list_for_each_entry_safe(ctrl, tmp, &nvme_rdma_ctrl_list, list) {
> + int delete_ctrl;
> +
> + if (ctrl->device->dev != ib_device)
> + continue;
Also not important for now, but we probably should move to a per-device
list here if we move forward with this approach.
> + mutex_unlock(&nvme_rdma_ctrl_mutex);
After unlocking nvme_rdma_ctrl_mutex we will need to restart the
list walk, as others might have changed the list (e.g. for a different
device). Maybe we should do the per-device list from the start to
simplify this loop.
> @@ -2052,6 +2060,7 @@ static void __exit nvme_rdma_cleanup_module(void)
> __nvme_rdma_del_ctrl(ctrl);
> mutex_unlock(&nvme_rdma_ctrl_mutex);
>
> + ib_unregister_client(&nvme_rdma_ib_client);
We shouldn't need the deletion loop above because now ib_unregister_client
takes care of that, right?
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