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From: Ferruh Yigit <ferruh.yigit@intel.com>
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Message-ID: <050d4b36-a6d5-5044-3462-e751642ea1ff@intel.com>
Date: Wed, 9 May 2018 19:07:09 +0100
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Subject: Re: [dpdk-dev] [dpdk-stable] [PATCH 09/11] ethdev: fix port probing
notification
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On 5/9/2018 10:43 AM, Thomas Monjalon wrote:
> The new device was notified as soon as it was allocated.
> It leads to use a device which is not yet initialized.
>
> The notification must be published after the initialization is done
> by the PMD, but before the state is changed, in order to let
> notified entities taking ownership before general availability.
>
> Fixes: 29aa41e36de7 ("ethdev: add notifications for probing and removal")
> Cc: stable@dpdk.org
>
> Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
> ---
> lib/librte_ethdev/rte_ethdev.c | 5 ++---
> lib/librte_ethdev/rte_ethdev_driver.h | 2 ++
> 2 files changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
> index 91cd0db11..e1209bb2a 100644
> --- a/lib/librte_ethdev/rte_ethdev.c
> +++ b/lib/librte_ethdev/rte_ethdev.c
> @@ -315,9 +315,6 @@ rte_eth_dev_allocate(const char *name)
> unlock:
> rte_spinlock_unlock(&rte_eth_dev_shared_data->ownership_lock);
>
> - if (eth_dev != NULL)
> - _rte_eth_dev_callback_process(eth_dev, RTE_ETH_EVENT_NEW, NULL);
> -
> return eth_dev;
> }
>
> @@ -3386,6 +3383,8 @@ rte_eth_dev_probing_finish(struct rte_eth_dev *dev)
> if (dev == NULL)
> return;
>
> + _rte_eth_dev_callback_process(dev, RTE_ETH_EVENT_NEW, NULL);
> +
Technically we can have as many ethdev created as we want in probe() right?
Doesn't have to be a one to one mapping there, having user event in
rte_eth_dev_allocate() guaranties each ethdev created sends the event.
But when you moved this into probe() now one event sent for event, same comment
for previous one, I don't think it is good idea to tie ethdev allocation with
probe()
> dev->state = RTE_ETH_DEV_ATTACHED;
> }
>
> diff --git a/lib/librte_ethdev/rte_ethdev_driver.h b/lib/librte_ethdev/rte_ethdev_driver.h
> index 3640dff68..c9c825e3f 100644
> --- a/lib/librte_ethdev/rte_ethdev_driver.h
> +++ b/lib/librte_ethdev/rte_ethdev_driver.h
> @@ -106,6 +106,8 @@ int _rte_eth_dev_callback_process(struct rte_eth_dev *dev,
> * This is the last step of device probing.
> * It must be called after a port is allocated and initialized successfully.
> *
> + * The notification RTE_ETH_EVENT_NEW is sent to other entities
> + * (libraries and applications).
> * The state is set as RTE_ETH_DEV_ATTACHED.
> *
> * @param dev
>