From: Shreyansh Jain <shreyansh.jain@nxp.com>
To: Ben Walker <benjamin.walker@intel.com>
Cc: dev@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] pci: Don't call probe callback if driver already loaded.
Date: Wed, 2 Nov 2016 14:59:27 +0530 [thread overview]
Message-ID: <07a79e86-fadc-a702-28be-883f0b736964@nxp.com> (raw)
In-Reply-To: <1477432240-20406-1-git-send-email-benjamin.walker@intel.com>
On 10/26/2016 3:20 AM, Ben Walker wrote:
> If the user asks to probe multiple times, the probe
> callback should only be called on devices that don't have
> a driver already loaded.
>
> This is useful if a driver is registered after the
> execution of a program has started and the list of devices
> needs to be re-scanned.
>
> Signed-off-by: Ben Walker <benjamin.walker@intel.com>
> ---
> lib/librte_eal/common/eal_common_pci.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/lib/librte_eal/common/eal_common_pci.c b/lib/librte_eal/common/eal_common_pci.c
> index 638cd86..971ad20 100644
> --- a/lib/librte_eal/common/eal_common_pci.c
> +++ b/lib/librte_eal/common/eal_common_pci.c
> @@ -289,6 +289,10 @@ pci_probe_all_drivers(struct rte_pci_device *dev)
> if (dev == NULL)
> return -1;
>
> + /* Check if a driver is already loaded */
> + if (dev->driver != NULL)
> + return 0;
> +
In case if it is required to change the driver assigned to a device, would it mean application relies on detach(dev)->new-driver-plugged-in->attach(dev) sequence?
To me, the above change sounds fine. Though, I am not aware if there is even a use case for changing driver assigned to a device. detach()->attach() should be able to work in those cases, I think.
> TAILQ_FOREACH(dr, &pci_driver_list, next) {
> rc = rte_eal_pci_probe_one_driver(dr, dev);
> if (rc < 0)
>
-
Shreyansh
next prev parent reply other threads:[~2016-11-02 9:29 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-10-25 21:50 Ben Walker
2016-10-27 13:28 ` David Marchand
2016-10-27 13:30 ` David Marchand
2016-11-02 9:29 ` Shreyansh Jain [this message]
2016-11-06 21:59 ` Thomas Monjalon
2016-11-07 9:02 ` David Marchand
2016-11-07 9:03 ` [dpdk-dev] [PATCH] pci: do not mark device as taken when probe fails David Marchand
2016-11-07 13:42 ` Thomas Monjalon
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