From: Andrew Rybchenko <arybchenko@solarflare.com>
To: Thomas Monjalon <thomas@monjalon.net>, <dev@dpdk.org>
Cc: Matan Azrad <matan@mellanox.com>
Subject: Re: [dpdk-dev] [PATCH v2 10/11] net/failsafe: fix sub-device ownership race
Date: Thu, 10 May 2018 14:15:44 +0300 [thread overview]
Message-ID: <6fd5308e-9566-b220-7ec9-175d82a4aded@solarflare.com> (raw)
In-Reply-To: <20180509224313.27289-11-thomas@monjalon.net>
On 05/10/2018 01:43 AM, Thomas Monjalon wrote:
> From: Matan Azrad <matan@mellanox.com>
>
> There is time between the sub-device port probing by the sub-device PMD
> to the sub-device port ownership taking by a fail-safe port.
>
> In this time, the port is available for the application usage. For
> example, the port will be exposed to the applications which use
> RTE_ETH_FOREACH_DEV iterator.
>
> Thus, ownership unaware applications may manage the port in this time
> what may cause a lot of problematic behaviors in the fail-safe
> sub-device initialization.
>
> Register to the ethdev NEW event to take the sub-device port ownership
> before it becomes exposed to the application.
>
> Fixes: a46f8d584eb8 ("net/failsafe: add fail-safe PMD")
> Cc: stable@dpdk.org
>
> Signed-off-by: Matan Azrad <matan@mellanox.com>
> Acked-by: Gaetan Rivet <gaetan.rivet@6wind.com>
> ---
> drivers/net/failsafe/failsafe.c | 22 ++++++++++---
> drivers/net/failsafe/failsafe_eal.c | 56 ++++++++++++++++++++++-----------
> drivers/net/failsafe/failsafe_ether.c | 23 ++++++++++++++
> drivers/net/failsafe/failsafe_private.h | 4 +++
> 4 files changed, 82 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/net/failsafe/failsafe.c b/drivers/net/failsafe/failsafe.c
> index fc989c4f5..c9d128de3 100644
> --- a/drivers/net/failsafe/failsafe.c
> +++ b/drivers/net/failsafe/failsafe.c
> @@ -204,16 +204,25 @@ fs_eth_dev_create(struct rte_vdev_device *vdev)
> }
> snprintf(priv->my_owner.name, sizeof(priv->my_owner.name),
> FAILSAFE_OWNER_NAME);
> + DEBUG("Failsafe port %u owner info: %s_%016"PRIX64, dev->data->port_id,
> + priv->my_owner.name, priv->my_owner.id);
> + ret = rte_eth_dev_callback_register(RTE_ETH_ALL, RTE_ETH_EVENT_NEW,
> + failsafe_eth_new_event_callback,
> + dev);
> + if (ret) {
> + ERROR("Failed to register NEW callback");
> + goto free_args;
> + }
> ret = failsafe_eal_init(dev);
> if (ret)
> - goto free_args;
> + goto unregister_new_callback;
> ret = fs_mutex_init(priv);
> if (ret)
> - goto free_args;
> + goto unregister_new_callback;
> ret = failsafe_hotplug_alarm_install(dev);
> if (ret) {
> ERROR("Could not set up plug-in event detection");
> - goto free_args;
> + goto unregister_new_callback;
> }
> mac = &dev->data->mac_addrs[0];
> if (mac_from_arg) {
> @@ -226,7 +235,7 @@ fs_eth_dev_create(struct rte_vdev_device *vdev)
> mac);
> if (ret) {
> ERROR("Failed to set default MAC address");
> - goto free_args;
> + goto unregister_new_callback;
It will fail to apply on next-net since there is cancel_alarm there now.
So, this hunk should be simply skipped.
> }
> }
> } else {
> @@ -261,6 +270,9 @@ fs_eth_dev_create(struct rte_vdev_device *vdev)
> };
> rte_eth_dev_probing_finish(dev);
> return 0;
> +unregister_new_callback:
> + rte_eth_dev_callback_unregister(RTE_ETH_ALL, RTE_ETH_EVENT_NEW,
> + failsafe_eth_new_event_callback, dev);
There is cancel_alarm here in next-net.
> free_args:
> failsafe_args_free(dev);
> free_subs:
> @@ -280,6 +292,8 @@ fs_rte_eth_free(const char *name)
> dev = rte_eth_dev_allocated(name);
> if (dev == NULL)
> return -ENODEV;
> + rte_eth_dev_callback_unregister(RTE_ETH_ALL, RTE_ETH_EVENT_NEW,
> + failsafe_eth_new_event_callback, dev);
> ret = failsafe_eal_uninit(dev);
> if (ret)
> ERROR("Error while uninitializing sub-EAL");
> diff --git a/drivers/net/failsafe/failsafe_eal.c b/drivers/net/failsafe/failsafe_eal.c
> index ce767703f..5672f3961 100644
> --- a/drivers/net/failsafe/failsafe_eal.c
> +++ b/drivers/net/failsafe/failsafe_eal.c
> @@ -18,8 +18,9 @@ fs_ethdev_portid_get(const char *name, uint16_t *port_id)
> return -EINVAL;
> }
> len = strlen(name);
> - RTE_ETH_FOREACH_DEV(pid) {
> - if (!strncmp(name, rte_eth_devices[pid].device->name, len)) {
> + for (pid = 0; pid < RTE_MAX_ETHPORTS; pid++) {
> + if (rte_eth_dev_is_valid_port(pid) &&
> + !strncmp(name, rte_eth_devices[pid].device->name, len)) {
> *port_id = pid;
> return 0;
> }
> @@ -41,6 +42,8 @@ fs_bus_init(struct rte_eth_dev *dev)
> continue;
> da = &sdev->devargs;
> if (fs_ethdev_portid_get(da->name, &pid) != 0) {
> + struct rte_eth_dev_owner pid_owner;
> +
> ret = rte_eal_hotplug_add(da->bus->name,
> da->name,
> da->args);
> @@ -55,12 +58,26 @@ fs_bus_init(struct rte_eth_dev *dev)
> ERROR("sub_device %d init went wrong", i);
> return -ENODEV;
> }
> + /*
> + * The NEW callback tried to take ownership, check
> + * whether it succeed or didn't.
> + */
> + rte_eth_dev_owner_get(pid, &pid_owner);
> + if (pid_owner.id != PRIV(dev)->my_owner.id) {
> + INFO("sub_device %d owner(%s_%016"PRIX64") is not my,"
> + " owner(%s_%016"PRIX64"), will try again later",
Frankly speaking I don't understand what and why will change later.
> + i, pid_owner.name, pid_owner.id,
> + PRIV(dev)->my_owner.name,
> + PRIV(dev)->my_owner.id);
> + continue;
> + }
> } else {
> + /* The sub-device port was found. */
> char devstr[DEVARGS_MAXLEN] = "";
> struct rte_devargs *probed_da =
> rte_eth_devices[pid].device->devargs;
>
> - /* Take control of device probed by EAL options. */
> + /* Take control of probed device. */
> free(da->args);
> memset(da, 0, sizeof(*da));
> if (probed_da != NULL)
> @@ -77,22 +94,23 @@ fs_bus_init(struct rte_eth_dev *dev)
> }
> INFO("Taking control of a probed sub device"
> " %d named %s", i, da->name);
> - }
> - ret = rte_eth_dev_owner_set(pid, &PRIV(dev)->my_owner);
> - if (ret < 0) {
> - INFO("sub_device %d owner set failed (%s),"
> - " will try again later", i, strerror(-ret));
> - continue;
> - } else if (strncmp(rte_eth_devices[pid].device->name, da->name,
> - strlen(da->name)) != 0) {
> - /*
> - * The device probably was removed and its port id was
> - * reallocated before ownership set.
> - */
> - rte_eth_dev_owner_unset(pid, PRIV(dev)->my_owner.id);
> - INFO("sub_device %d was probably removed before taking"
> - " ownership, will try again later", i);
> - continue;
> + ret = rte_eth_dev_owner_set(pid, &PRIV(dev)->my_owner);
> + if (ret < 0) {
> + INFO("sub_device %d owner set failed (%s), "
> + "will try again later", i, strerror(-ret));
> + continue;
> + } else if (strncmp(rte_eth_devices[pid].device->name,
> + da->name, strlen(da->name)) != 0) {
> + /*
> + * The device probably was removed and its port
> + * id was reallocated before ownership set.
> + */
> + rte_eth_dev_owner_unset(pid,
> + PRIV(dev)->my_owner.id);
> + INFO("sub_device %d was removed before taking"
> + " ownership, will try again later", i);
> + continue;
> + }
> }
> ETH(sdev) = &rte_eth_devices[pid];
> SUB_ID(sdev) = i;
> diff --git a/drivers/net/failsafe/failsafe_ether.c b/drivers/net/failsafe/failsafe_ether.c
> index b414a7884..ebce87841 100644
> --- a/drivers/net/failsafe/failsafe_ether.c
> +++ b/drivers/net/failsafe/failsafe_ether.c
> @@ -463,3 +463,26 @@ failsafe_eth_lsc_event_callback(uint16_t port_id __rte_unused,
> else
> return 0;
> }
> +
> +/* Take sub-device ownership before it becomes exposed to the application. */
> +int
> +failsafe_eth_new_event_callback(uint16_t port_id,
> + enum rte_eth_event_type event __rte_unused,
> + void *cb_arg, void *out __rte_unused)
> +{
> + struct rte_eth_dev *fs_dev = cb_arg;
> + struct sub_device *sdev;
> + struct rte_eth_dev *dev = &rte_eth_devices[port_id];
> + size_t len = strlen(dev->device->name);
> + uint8_t i;
> +
> + FOREACH_SUBDEV_STATE(sdev, i, fs_dev, DEV_PARSED) {
> + if (sdev->state >= DEV_PROBED)
> + continue;
> + if (strncmp(sdev->devargs.name, dev->device->name, len) != 0)
Shouldn't we ensure that name is exact match instead of checking
sdev->devargs.name prefix only.
> + continue;
> + rte_eth_dev_owner_set(port_id, &PRIV(fs_dev)->my_owner);
I think return value should be processed here.
If we really ignore it, it should be explained why.
> + break;
> + }
> + return 0;
> +}
> diff --git a/drivers/net/failsafe/failsafe_private.h b/drivers/net/failsafe/failsafe_private.h
> index b54f8e336..cd8e0b8c9 100644
> --- a/drivers/net/failsafe/failsafe_private.h
> +++ b/drivers/net/failsafe/failsafe_private.h
> @@ -220,6 +220,10 @@ int failsafe_eth_rmv_event_callback(uint16_t port_id,
> int failsafe_eth_lsc_event_callback(uint16_t port_id,
> enum rte_eth_event_type event,
> void *cb_arg, void *out);
> +int
> +failsafe_eth_new_event_callback(uint16_t port_id,
> + enum rte_eth_event_type event,
> + void *cb_arg, void *out);
Return value type and function name should be on the same line in
accordance with style used in this file. Just to be consistent.
[...]
next prev parent reply other threads:[~2018-05-10 11:15 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-09 9:43 [dpdk-dev] [PATCH 00/11] ethdev: fix race conditions in iterator and notifications Thomas Monjalon
2018-05-09 9:43 ` [dpdk-dev] [PATCH 01/11] ethdev: fix debug log of owner id Thomas Monjalon
2018-05-09 17:53 ` [dpdk-dev] [dpdk-stable] " Ferruh Yigit
2018-05-09 9:43 ` [dpdk-dev] [PATCH 02/11] net/failsafe: fix sub-device visibility Thomas Monjalon
2018-05-09 12:13 ` Gaëtan Rivet
2018-05-09 12:21 ` Thomas Monjalon
2018-05-09 9:43 ` [dpdk-dev] [PATCH 03/11] ethdev: add doxygen comments for each state Thomas Monjalon
2018-05-09 17:54 ` Ferruh Yigit
2018-05-09 9:43 ` [dpdk-dev] [PATCH 04/11] drivers/net: use higher level of probing helper for PCI Thomas Monjalon
2018-05-09 17:54 ` Ferruh Yigit
2018-05-09 9:43 ` [dpdk-dev] [PATCH 05/11] ethdev: add probing finish function Thomas Monjalon
2018-05-10 20:18 ` Stephen Hemminger
2018-05-10 21:49 ` Thomas Monjalon
2018-05-09 9:43 ` [dpdk-dev] [PATCH 06/11] ethdev: allow ownership operations on unused port Thomas Monjalon
2018-05-09 18:00 ` Ferruh Yigit
2018-05-09 19:05 ` Thomas Monjalon
2018-05-10 20:26 ` Stephen Hemminger
2018-05-10 21:53 ` Thomas Monjalon
2018-05-09 9:43 ` [dpdk-dev] [PATCH 07/11] ethdev: add lock to port allocation check Thomas Monjalon
2018-05-09 12:21 ` Gaëtan Rivet
2018-05-09 12:25 ` Thomas Monjalon
2018-05-10 20:35 ` Stephen Hemminger
2018-05-10 22:13 ` Thomas Monjalon
2018-05-10 23:47 ` Thomas Monjalon
2018-05-10 20:33 ` Stephen Hemminger
2018-05-10 22:10 ` Thomas Monjalon
2018-05-10 22:29 ` Stephen Hemminger
2018-05-09 9:43 ` [dpdk-dev] [PATCH 08/11] ethdev: fix port visibility before initialization Thomas Monjalon
2018-05-09 18:03 ` [dpdk-dev] [dpdk-stable] " Ferruh Yigit
2018-05-09 19:08 ` Thomas Monjalon
2018-05-10 20:40 ` [dpdk-dev] " Stephen Hemminger
2018-05-10 22:18 ` Thomas Monjalon
2018-05-09 9:43 ` [dpdk-dev] [PATCH 09/11] ethdev: fix port probing notification Thomas Monjalon
2018-05-09 18:07 ` [dpdk-dev] [dpdk-stable] " Ferruh Yigit
2018-05-09 19:13 ` Thomas Monjalon
2018-05-09 9:43 ` [dpdk-dev] [PATCH 10/11] net/failsafe: fix sub-device ownership race Thomas Monjalon
2018-05-09 12:41 ` Gaëtan Rivet
2018-05-09 13:01 ` Matan Azrad
2018-05-09 13:30 ` Gaëtan Rivet
2018-05-09 13:43 ` Thomas Monjalon
2018-05-09 14:03 ` Gaëtan Rivet
2018-05-09 21:59 ` [dpdk-dev] [dpdk-stable] " Thomas Monjalon
2018-05-09 13:26 ` [dpdk-dev] " Thomas Monjalon
2018-05-09 9:43 ` [dpdk-dev] [PATCH 11/11] ethdev: fix port removal notification timing Thomas Monjalon
2018-05-09 18:07 ` [dpdk-dev] [dpdk-stable] " Ferruh Yigit
2018-05-09 22:43 ` [dpdk-dev] [PATCH v2 00/11] ethdev: fix race conditions in iterator and notifications Thomas Monjalon
2018-05-09 22:43 ` [dpdk-dev] [PATCH v2 01/11] ethdev: fix debug log of owner id Thomas Monjalon
2018-05-10 9:49 ` Andrew Rybchenko
2018-05-09 22:43 ` [dpdk-dev] [PATCH v2 02/11] net/failsafe: fix sub-device visibility Thomas Monjalon
2018-05-10 9:55 ` Andrew Rybchenko
2018-05-09 22:43 ` [dpdk-dev] [PATCH v2 03/11] ethdev: add doxygen comments for each state Thomas Monjalon
2018-05-10 9:56 ` Andrew Rybchenko
2018-05-09 22:43 ` [dpdk-dev] [PATCH v2 04/11] drivers/net: use higher level of probing helper for PCI Thomas Monjalon
2018-05-10 10:03 ` Andrew Rybchenko
2018-05-09 22:43 ` [dpdk-dev] [PATCH v2 05/11] ethdev: add probing finish function Thomas Monjalon
2018-05-10 10:37 ` Andrew Rybchenko
2018-05-10 10:54 ` Thomas Monjalon
2018-05-10 11:24 ` Andrew Rybchenko
2018-05-09 22:43 ` [dpdk-dev] [PATCH v2 06/11] ethdev: allow ownership operations on unused port Thomas Monjalon
2018-05-10 10:41 ` Andrew Rybchenko
2018-05-09 22:43 ` [dpdk-dev] [PATCH v2 07/11] ethdev: add lock to port allocation check Thomas Monjalon
2018-05-10 10:44 ` Andrew Rybchenko
2018-05-09 22:43 ` [dpdk-dev] [PATCH v2 08/11] ethdev: fix port visibility before initialization Thomas Monjalon
2018-05-10 10:52 ` Andrew Rybchenko
2018-05-09 22:43 ` [dpdk-dev] [PATCH v2 09/11] ethdev: fix port probing notification Thomas Monjalon
2018-05-10 10:53 ` Andrew Rybchenko
2018-05-09 22:43 ` [dpdk-dev] [PATCH v2 10/11] net/failsafe: fix sub-device ownership race Thomas Monjalon
2018-05-10 11:15 ` Andrew Rybchenko [this message]
2018-05-10 12:03 ` Matan Azrad
2018-05-09 22:43 ` [dpdk-dev] [PATCH v2 11/11] ethdev: fix port removal notification timing Thomas Monjalon
2018-05-10 11:17 ` Andrew Rybchenko
2018-05-10 11:19 ` [dpdk-dev] [PATCH v2 00/11] ethdev: fix race conditions in iterator and notifications Andrew Rybchenko
2018-05-10 16:23 ` Gaëtan Rivet
2018-05-10 22:27 ` [dpdk-dev] [PATCH " Stephen Hemminger
2018-05-10 23:58 ` [dpdk-dev] [PATCH v3 " Thomas Monjalon
2018-05-10 23:58 ` [dpdk-dev] [PATCH v3 01/11] ethdev: fix debug log of owner id Thomas Monjalon
2018-05-10 23:58 ` [dpdk-dev] [PATCH v3 02/11] net/failsafe: fix sub-device visibility Thomas Monjalon
2018-05-10 23:58 ` [dpdk-dev] [PATCH v3 03/11] ethdev: add doxygen comments for each state Thomas Monjalon
2018-05-10 23:58 ` [dpdk-dev] [PATCH v3 04/11] drivers/net: use higher level of probing helper for PCI Thomas Monjalon
2018-05-10 23:58 ` [dpdk-dev] [PATCH v3 05/11] ethdev: add probing finish function Thomas Monjalon
2018-05-23 10:09 ` Ferruh Yigit
2018-05-23 10:14 ` Thomas Monjalon
2018-05-10 23:58 ` [dpdk-dev] [PATCH v3 06/11] ethdev: allow ownership operations on unused port Thomas Monjalon
2018-05-10 23:58 ` [dpdk-dev] [PATCH v3 07/11] ethdev: add lock to port allocation check Thomas Monjalon
2018-05-10 23:58 ` [dpdk-dev] [PATCH v3 08/11] ethdev: fix port visibility before initialization Thomas Monjalon
2018-05-10 23:58 ` [dpdk-dev] [PATCH v3 09/11] ethdev: fix port probing notification Thomas Monjalon
2018-05-10 23:58 ` [dpdk-dev] [PATCH v3 10/11] net/failsafe: fix sub-device ownership race Thomas Monjalon
2018-05-10 23:58 ` [dpdk-dev] [PATCH v3 11/11] ethdev: fix port removal notification timing Thomas Monjalon
2018-05-11 1:14 ` [dpdk-dev] [PATCH v3 00/11] ethdev: fix race conditions in iterator and notifications Ferruh Yigit
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