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To: Thomas Monjalon <thomas@monjalon.net>, dev@dpdk.org
Cc: stable@dpdk.org, Matan Azrad <matan@mellanox.com>
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From: Ferruh Yigit <ferruh.yigit@intel.com>
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Message-ID: <d7cc0e37-29d9-7793-1386-c556e1358793@intel.com>
Date: Wed, 9 May 2018 19:03:10 +0100
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Subject: Re: [dpdk-stable] [PATCH 08/11] ethdev: fix port visibility before
initialization
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On 5/9/2018 10:43 AM, Thomas Monjalon wrote:
> The port was set to the state ATTACHED during allocation.
> The consequence was to iterate over ports which are not initialized.
>
> The state ATTACHED is now set as the last step of probing.
>
> The uniqueness of port name is now checked before the availability
> of a port id for allocation (order reversed).
>
> As the state is not set on allocation anymore, it is also not checked
> in the function telling whether a port is allocated or not.
> The name of the port is set on allocation, so it is enough as a check.
>
> Fixes: 5588909af21b ("ethdev: add device iterator")
> Cc: stable@dpdk.org
>
> Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
> Signed-off-by: Matan Azrad <matan@mellanox.com>
> ---
> lib/librte_ethdev/rte_ethdev.c | 18 +++++++++---------
> lib/librte_ethdev/rte_ethdev_driver.h | 2 ++
> 2 files changed, 11 insertions(+), 9 deletions(-)
>
> diff --git a/lib/librte_ethdev/rte_ethdev.c b/lib/librte_ethdev/rte_ethdev.c
> index 357be2dca..91cd0db11 100644
> --- a/lib/librte_ethdev/rte_ethdev.c
> +++ b/lib/librte_ethdev/rte_ethdev.c
> @@ -233,7 +233,7 @@ rte_eth_dev_allocated_lock_free(const char *name)
> unsigned i;
>
> for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
> - if ((rte_eth_devices[i].state == RTE_ETH_DEV_ATTACHED) &&
> + if (rte_eth_devices[i].data != NULL &&
> strcmp(rte_eth_devices[i].data->name, name) == 0)
> return &rte_eth_devices[i];
> }
> @@ -278,7 +278,6 @@ eth_dev_get(uint16_t port_id)
> struct rte_eth_dev *eth_dev = &rte_eth_devices[port_id];
>
> eth_dev->data = &rte_eth_dev_shared_data->data[port_id];
> - eth_dev->state = RTE_ETH_DEV_ATTACHED;
>
> eth_dev_last_created_port = port_id;
>
> @@ -296,16 +295,15 @@ rte_eth_dev_allocate(const char *name)
> /* Synchronize port creation between primary and secondary threads. */
> rte_spinlock_lock(&rte_eth_dev_shared_data->ownership_lock);
>
> - port_id = rte_eth_dev_find_free_port();
> - if (port_id == RTE_MAX_ETHPORTS) {
> - ethdev_log(ERR, "Reached maximum number of Ethernet ports");
> + if (rte_eth_dev_allocated_lock_free(name) != NULL) {
> + ethdev_log(ERR, "Ethernet device with name %s already allocated",
> + name);
> goto unlock;
> }
>
> - if (rte_eth_dev_allocated_lock_free(name) != NULL) {
> - ethdev_log(ERR,
> - "Ethernet Device with name %s already allocated!",
> - name);
> + port_id = rte_eth_dev_find_free_port();
> + if (port_id == RTE_MAX_ETHPORTS) {
> + ethdev_log(ERR, "Reached maximum number of Ethernet ports");
> goto unlock;
> }
>
> @@ -3387,6 +3385,8 @@ rte_eth_dev_probing_finish(struct rte_eth_dev *dev)
> {
> if (dev == NULL)
> return;
> +
> + dev->state = RTE_ETH_DEV_ATTACHED;
Aren't ethdev allocation and probe in different levels? Why not make ethdev
allocation self sufficient but tie it to the device probe() ?
> }
>
> int
> diff --git a/lib/librte_ethdev/rte_ethdev_driver.h b/lib/librte_ethdev/rte_ethdev_driver.h
> index 3821f0b1d..3640dff68 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 state is set as RTE_ETH_DEV_ATTACHED.
> + *
> * @param dev
> * New ethdev port.
> */
>