[dpdk-dev] [PATCH 04/13] eal: introduce driver type
Shreyansh Jain
shreyansh.jain at nxp.com
Tue Dec 20 08:16:17 CET 2016
On Tuesday 20 December 2016 03:29 AM, Stephen Hemminger wrote:
> Since multiple buses and device types need to be supported.
> Provide type field in driver.
> ---
> lib/librte_eal/common/include/rte_dev.h | 15 ++++++++++++---
> lib/librte_eal/common/include/rte_pci.h | 1 +
> lib/librte_eal/common/include/rte_vdev.h | 1 +
> 3 files changed, 14 insertions(+), 3 deletions(-)
>
> diff --git a/lib/librte_eal/common/include/rte_dev.h b/lib/librte_eal/common/include/rte_dev.h
> index e5471a22..3f4e26e6 100644
> --- a/lib/librte_eal/common/include/rte_dev.h
> +++ b/lib/librte_eal/common/include/rte_dev.h
> @@ -144,12 +144,21 @@ void rte_eal_device_insert(struct rte_device *dev);
> void rte_eal_device_remove(struct rte_device *dev);
>
> /**
> + * Type of device driver
> + */
> +enum rte_driver_type {
> + PMD_VIRTUAL,
> + PMD_PCI,
> +};
So the expectation is that if a new device type is introduced (anything
other than virtual or PCI), this enum is expanded?
Broadly, we have two possible ways being discussed on ML for device
relationship with PMD/APIs:
1. the way you have done: each device belongs to a particular type (enum
rte_driver_type) and based on its type, operations would be performed on
it (using conditional operators, for example). We continue to have a
common device list containing all type of devices.
2. disassociating the device (rte_device) completely from its type and
basing it on a Bus type. So, we have separate buses for each device type
and hence no need for separation of logic based on device type.
I think implementation similar to (1) existed before it was removed in
6751f6de.
I have an (obvious) inclination towards (2) because that helps plugging
in more drivers/device types without expecting the contributor to change
the EAL - however trivial the change is.
> +
> +/**
> * A structure describing a device driver.
> */
> struct rte_driver {
> TAILQ_ENTRY(rte_driver) next; /**< Next in list. */
> - const char *name; /**< Driver name. */
> - const char *alias; /**< Driver alias. */
> + const char *name; /**< Driver name. */
> + const char *alias; /**< Driver alias. */
> + enum rte_driver_type type; /**< Driver type. */
> };
>
> /**
> @@ -243,4 +252,4 @@ __attribute__((used)) = str
> }
> #endif
>
> -#endif /* _RTE_VDEV_H_ */
> +#endif /* _RTE_DEV_H_ */
> diff --git a/lib/librte_eal/common/include/rte_pci.h b/lib/librte_eal/common/include/rte_pci.h
> index 9ce88472..d377d539 100644
> --- a/lib/librte_eal/common/include/rte_pci.h
> +++ b/lib/librte_eal/common/include/rte_pci.h
> @@ -492,6 +492,7 @@ RTE_INIT(pciinitfn_ ##nm); \
> static void pciinitfn_ ##nm(void) \
> {\
> (pci_drv).driver.name = RTE_STR(nm);\
> + (pci_drv).driver.type = PMD_PCI; \
> rte_eal_pci_register(&pci_drv); \
> } \
> RTE_PMD_EXPORT_NAME(nm, __COUNTER__)
> diff --git a/lib/librte_eal/common/include/rte_vdev.h b/lib/librte_eal/common/include/rte_vdev.h
> index 784e837d..98fb5bb5 100644
> --- a/lib/librte_eal/common/include/rte_vdev.h
> +++ b/lib/librte_eal/common/include/rte_vdev.h
> @@ -88,6 +88,7 @@ static void vdrvinitfn_ ##vdrv(void)\
> {\
> (vdrv).driver.name = RTE_STR(nm);\
> (vdrv).driver.alias = vdrvinit_ ## nm ## _alias;\
> + (vdrv).driver.type = PMD_VIRTUAL;\
> rte_eal_vdrv_register(&vdrv);\
> } \
> RTE_PMD_EXPORT_NAME(nm, __COUNTER__)
>
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