[dpdk-dev] [PATCH v14 1/6] ethdev: add function to release port in secondary process
Andrew Rybchenko
arybchenko at solarflare.com
Sun Aug 12 13:05:03 CEST 2018
On 10.08.2018 03:42, Qi Zhang wrote:
> Add driver API rte_eth_release_port_secondary to support the
> case when an ethdev need to be detached on a secondary process.
> Local state is set to unused and shared data will not be reset
> so the primary process can still use it.
>
> Signed-off-by: Qi Zhang <qi.z.zhang at intel.com>
> ---
> lib/librte_ethdev/rte_ethdev.c | 21 ++++++++++++++++++---
> lib/librte_ethdev/rte_ethdev_driver.h | 16 +++++++++++++++-
> lib/librte_ethdev/rte_ethdev_pci.h | 9 +++++++--
> lib/librte_ethdev/rte_ethdev_version.map | 7 +++++++
> 4 files changed, 47 insertions(+), 6 deletions(-)
>
> diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
> index 4c3202505..c653bf5fa 100644
> --- a/lib/librte_ethdev/rte_ethdev.c
> +++ b/lib/librte_ethdev/rte_ethdev.c
<...>
> @@ -3532,10 +3544,13 @@ rte_eth_dev_destroy(struct rte_eth_dev *ethdev,
> return ret;
> }
>
> - if (rte_eal_process_type() == RTE_PROC_PRIMARY)
> - rte_free(ethdev->data->dev_private);
> + if (rte_eal_process_type() != RTE_PROC_PRIMARY)
> + return rte_eth_dev_release_port_secondary(ethdev);
>
> - ethdev->data->dev_private = NULL;
> + if (ethdev->data->dev_private != NULL) {
The check is not necessary, rte_free() perfectly works with NULL.
> + rte_free(ethdev->data->dev_private);
> + ethdev->data->dev_private = NULL;
> + }
>
> return rte_eth_dev_release_port(ethdev);
> }
> diff --git a/lib/librte_ethdev/rte_ethdev_driver.h b/lib/librte_ethdev/rte_ethdev_driver.h
> index c6d9bc1a3..8fe82d2ab 100644
> --- a/lib/librte_ethdev/rte_ethdev_driver.h
> +++ b/lib/librte_ethdev/rte_ethdev_driver.h
> @@ -61,7 +61,7 @@ struct rte_eth_dev *rte_eth_dev_attach_secondary(const char *name);
> * Release the specified ethdev port.
> *
> * @param eth_dev
> - * The *eth_dev* pointer is the address of the *rte_eth_dev* structure.
> + * Device to be detached.
> * @return
> * - 0 on success, negative on error
> */
> @@ -69,6 +69,20 @@ int rte_eth_dev_release_port(struct rte_eth_dev *eth_dev);
>
> /**
> * @internal
> + * Release the specified ethdev port in the local process.
> + * Only set ethdev state to unused, but not reset shared data since
> + * it assume other processes is still using it. typically it is
> + * called by a secondary process.
> + *
> + * @param eth_dev
> + * Device to be detached.
> + * @return
> + * - 0 on success, negative on error
> + */
> +int rte_eth_dev_release_port_secondary(struct rte_eth_dev *eth_dev);
> +
> +/**
> + * @internal
> * Release device queues and clear its configuration to force the user
> * application to reconfigure it. It is for internal use only.
> *
> diff --git a/lib/librte_ethdev/rte_ethdev_pci.h b/lib/librte_ethdev/rte_ethdev_pci.h
> index f652596f4..c22022e4f 100644
> --- a/lib/librte_ethdev/rte_ethdev_pci.h
> +++ b/lib/librte_ethdev/rte_ethdev_pci.h
> @@ -135,9 +135,14 @@ rte_eth_dev_pci_allocate(struct rte_pci_device *dev, size_t private_data_size)
> static inline void
> rte_eth_dev_pci_release(struct rte_eth_dev *eth_dev)
> {@@ -359,6 +359,18 @@ rte_eth_dev_attach_secondary(const char *name)
> }
>
> int
> +rte_eth_dev_release_port_secondary(struct rte_eth_dev *eth_dev)
> +{
> + if (eth_dev == NULL)
> + return -EINVAL;
> +
> + _rte_eth_dev_callback_process(eth_dev, RTE_ETH_EVENT_DESTROY, NULL);
> + eth_dev->state = RTE_ETH_DEV_UNUSED;
> +
> + return 0;
> +}
> +
> +int
> rte_eth_dev_release_port(struct rte_eth_dev *eth_dev)
> {
> if (eth_dev == NULL)
>
>
> - if (rte_eal_process_type() == RTE_PROC_PRIMARY)
> - rte_free(eth_dev->data->dev_private);
> + if (rte_eal_process_type() != RTE_PROC_PRIMARY) {
> + eth_dev->device = NULL;
> + eth_dev->intr_handle = NULL;
> + rte_eth_dev_release_port_secondary(eth_dev);
Is return missing here. Below comment pretends that it is primary
process code.
> + }
>
> + /* primary process */
> + rte_free(eth_dev->data->dev_private);
> eth_dev->data->dev_private = NULL;
>
> /*
> diff --git a/lib/librte_ethdev/rte_ethdev_version.map b/lib/librte_ethdev/rte_ethdev_version.map
> index 38f117f01..acc407f86 100644
> --- a/lib/librte_ethdev/rte_ethdev_version.map
> +++ b/lib/librte_ethdev/rte_ethdev_version.map
> @@ -220,6 +220,13 @@ DPDK_18.08 {
>
> } DPDK_18.05;
>
> +DPDK_18.11 {
> + global:
> +
> + rte_eth_dev_release_port_secondary;
> +
> +} DPDK_18.08;
> +
> EXPERIMENTAL {
> global:
>
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