On 05/10/2018 01:43 AM, Thomas Monjalon wrote:
From: Matan Azrad <ma...@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: sta...@dpdk.org
Signed-off-by: Matan Azrad <ma...@mellanox.com>
Acked-by: Gaetan Rivet <gaetan.ri...@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.
[...]
