[dpdk-dev] [PATCH v4 1/4] ethdev: Add API to enable device event handler
Andrew Rybchenko
arybchenko at solarflare.com
Wed Jul 11 10:49:30 CEST 2018
On 10.07.2018 15:51, Jeff Guo wrote:
> Implement a couple of eal device event handler install/uninstall APIs
> in ethdev, it could let PMDs have chance to manage the eal device event,
> such as register device event callback, then monitor and process the
> hotplug event.
I think it is moving in right direction, but my problem with the patch is
that I don't understand what prevents us to make it even more generic.
Right now it looks like that PCI driver flag RTE_PCI_DRV_INTR_RMV is
sufficient and everything else could be done on ethdev layer.
RTE_PCI_DRV_INTR_RMV is mapped to RTE_ETH_DEV_INTR_RMV eth
device flag. The flag may be used as an indication in rte_eth_dev_create()
to register the callback.
May be I'm completely wrong above, but if so, I'd like to understand why
and prefer to see explanations in the patch description.
> Signed-off-by: Jeff Guo <jia.guo at intel.com>
> ---
> v4->v3:
> change to use eal device event handler install api
> ---
> doc/guides/rel_notes/release_18_08.rst | 12 +++++++
> lib/librte_ethdev/rte_ethdev.c | 59 ++++++++++++++++++++++++++++++++++
> lib/librte_ethdev/rte_ethdev_driver.h | 32 ++++++++++++++++++
> 3 files changed, 103 insertions(+)
>
> diff --git a/doc/guides/rel_notes/release_18_08.rst b/doc/guides/rel_notes/release_18_08.rst
> index bc01242..b6482ce 100644
> --- a/doc/guides/rel_notes/release_18_08.rst
> +++ b/doc/guides/rel_notes/release_18_08.rst
> @@ -46,6 +46,18 @@ New Features
> Flow API support has been added to CXGBE Poll Mode Driver to offload
> flows to Chelsio T5/T6 NICs.
>
> +* **Added eal device event process helper in ethdev.**
> +
> + Implement a couple of eal device event handler install/uninstall APIs in
> + ethdev, these helper could let PMDs have chance to manage the eal device
> + event, such as register device event callback, then monitor and process
> + hotplug event.
> +
> + * ``rte_eth_dev_event_handler_install`` for PMDs use to install the device
> + event handler.
> + * ``rte_eth_dev_event_handler_uninstall`` for PMDs use to uninstall the device
> + event handler.
> +
>
> API Changes
> -----------
> diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
> index a9977df..09ea02d 100644
> --- a/lib/librte_ethdev/rte_ethdev.c
> +++ b/lib/librte_ethdev/rte_ethdev.c
> @@ -4518,6 +4518,65 @@ rte_eth_devargs_parse(const char *dargs, struct rte_eth_devargs *eth_da)
> return result;
> }
>
> +static void __rte_experimental
> +eth_dev_event_callback(char *device_name, enum rte_dev_event_type type,
> + void *arg)
> +{
> + struct rte_eth_dev *eth_dev = (struct rte_eth_dev *)arg;
> +
> + switch (type) {
> + case RTE_DEV_EVENT_REMOVE:
> + ethdev_log(INFO, "The device: %s has been removed!\n",
Colon after 'device' above looks strange for me. I'd suggest to remove it.
If so, similar below for ADD.
> + device_name);
> +
> + if (!device_name || !eth_dev)
> + return;
> +
> + if (!(eth_dev->data->dev_flags & RTE_ETH_EVENT_INTR_RMV))
It looks like a typo above. Shouldn't it be RTE_ETH_DEV_INTR_RMV?
> + return;
> +
> + if (!strcmp(device_name, eth_dev->device->name))
> + _rte_eth_dev_callback_process(eth_dev,
> + RTE_ETH_EVENT_INTR_RMV,
> + NULL);
> + break;
> + case RTE_DEV_EVENT_ADD:
> + ethdev_log(INFO, "The device: %s has been added!\n",
> + device_name);
> + break;
> + default:
> + break;
> + }
> +}
> +
> +int __rte_experimental
> +rte_eth_dev_event_handler_install(struct rte_eth_dev *eth_dev)
> +{
> + int result = 0;
> +
> + result = rte_dev_event_callback_register(eth_dev->device->name,
> + eth_dev_event_callback, eth_dev);
> + if (result)
> + RTE_LOG(ERR, EAL, "device event callback register failed for "
> + "device:%s!\n", eth_dev->device->name);
Why ethdev_log() is used above, but here is RTE_LOG with EAL?
Similar question below.
> +
> + return result;
> +}
> +
> +int __rte_experimental
> +rte_eth_dev_event_handler_uninstall(struct rte_eth_dev *eth_dev)
> +{
> + int result = 0;
> +
> + result = rte_dev_event_callback_unregister(eth_dev->device->name,
> + eth_dev_event_callback, eth_dev);
> + if (result)
> + RTE_LOG(ERR, EAL, "device event callback unregister failed for"
> + " device:%s!\n", eth_dev->device->name);
> +
> + return result;
> +}
> +
> RTE_INIT(ethdev_init_log);
> static void
> ethdev_init_log(void)
<...>
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