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Date: Thu, 10 Oct 2019 10:09:17 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, ayal@...lanox.com,
moshe@...lanox.com, eranbe@...lanox.com, mlxsw@...lanox.com
Subject: Re: [patch net-next 3/4] netdevsim: implement couple of testing
devlink health reporters
Thu, Oct 10, 2019 at 05:53:51AM CEST, jakub.kicinski@...ronome.com wrote:
>On Wed, 9 Oct 2019 13:04:44 +0200, Jiri Pirko wrote:
>> From: Jiri Pirko <jiri@...lanox.com>
>>
>> Implement "empty" and "dummy" reporters. The first one is really simple
>> and does nothing. The other one has debugfs files to trigger breakage
>> and it is able to do recovery. The ops also implement dummy fmsg
>> content.
>>
>> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
>
>> diff --git a/drivers/net/netdevsim/health.c b/drivers/net/netdevsim/health.c
>> new file mode 100644
>> index 000000000000..088ae8fd89fc
>> --- /dev/null
>> +++ b/drivers/net/netdevsim/health.c
>
>> +static int
>> +nsim_dev_dummy_reporter_recover(struct devlink_health_reporter *reporter,
>> + void *priv_ctx,
>> + struct netlink_ext_ack *extack)
>> +{
>> + struct nsim_dev_health *health = devlink_health_reporter_priv(reporter);
>> + struct nsim_dev_dummy_reporter_ctx *ctx = priv_ctx;
>> +
>> + if (health->fail_recover) {
>> + /* For testing purposes, user set debugfs fail_recover
>> + * value to true. Fail right away.
>> + */
>> + NL_SET_ERR_MSG_MOD(extack, "User setup the recover to fail for testing purposes");
>> + return -EINVAL;
>> + }
>> + if (ctx) {
>> + health->recovered_break_msg = kstrdup(ctx->break_msg,
>
>Can't there already be a message there? wouldn't this leak it?
It would. Will fix.
>
>> + GFP_KERNEL);
>> + if (!health->recovered_break_msg)
>> + return -ENOMEM;
>> + }
>> + return 0;
>> +}
>
>> +static ssize_t nsim_dev_health_break_write(struct file *file,
>> + const char __user *data,
>> + size_t count, loff_t *ppos)
>> +{
>> + struct nsim_dev_health *health = file->private_data;
>> + struct nsim_dev_dummy_reporter_ctx ctx;
>> + char *break_msg;
>> + int err;
>> +
>> + break_msg = kmalloc(count + 1, GFP_KERNEL);
>> + if (!break_msg)
>> + return -ENOMEM;
>> +
>> + if (copy_from_user(break_msg, data, count)) {
>> + err = -EFAULT;
>> + goto out;
>> + }
>> + break_msg[count] = '\0';
>> + if (break_msg[count - 1] == '\n')
>> + break_msg[count - 1] = '\0';
>> +
>> + ctx.break_msg = break_msg;
>> + err = devlink_health_report(health->dummy_reporter, break_msg, &ctx);
>> + if (err)
>> + goto out;
>> +
>> +out:
>> + kfree(break_msg);
>> + return err ? err : count;
>
>nit: ?: works here, like you used below
Ok.
>
>> +}
>> +
>> +static const struct file_operations nsim_dev_health_break_fops = {
>> + .open = simple_open,
>> + .write = nsim_dev_health_break_write,
>> + .llseek = generic_file_llseek,
>> +};
>> +
>> +int nsim_dev_health_init(struct nsim_dev *nsim_dev, struct devlink *devlink)
>> +{
>> + struct nsim_dev_health *health = &nsim_dev->health;
>> + int err;
>> +
>> + health->empty_reporter =
>> + devlink_health_reporter_create(devlink,
>> + &nsim_dev_empty_reporter_ops,
>> + 0, false, health);
>> + if (IS_ERR(health->empty_reporter))
>> + return PTR_ERR(health->empty_reporter);
>> +
>> + health->dummy_reporter =
>> + devlink_health_reporter_create(devlink,
>> + &nsim_dev_dummy_reporter_ops,
>> + 0, false, health);
>> + if (IS_ERR(health->dummy_reporter)) {
>> + err = PTR_ERR(health->dummy_reporter);
>> + goto err_empty_reporter_destroy;
>> + }
>> +
>> + health->ddir = debugfs_create_dir("health", nsim_dev->ddir);
>> + if (IS_ERR_OR_NULL(health->ddir))
>> + return PTR_ERR_OR_ZERO(health->ddir) ?: -EINVAL;
>
>goto err_dummy_reporter_destroy?
Right.
>
>> + health->recovered_break_msg = NULL;
>> + debugfs_create_file("break_health", 0200, health->ddir, health,
>> + &nsim_dev_health_break_fops);
>> + health->binary_len = 16;
>> + debugfs_create_u32("binary_len", 0600, health->ddir,
>> + &health->binary_len);
>> + health->fail_recover = false;
>> + debugfs_create_bool("fail_recover", 0600, health->ddir,
>> + &health->fail_recover);
>> + return 0;
>> +
>> +err_empty_reporter_destroy:
>> + devlink_health_reporter_destroy(health->empty_reporter);
>> + return err;
>> +}
>> +
>> +void nsim_dev_health_exit(struct nsim_dev *nsim_dev)
>> +{
>> + struct nsim_dev_health *health = &nsim_dev->health;
>> +
>> + debugfs_remove_recursive(health->ddir);
>> + kfree(health->recovered_break_msg);
>> + devlink_health_reporter_destroy(health->dummy_reporter);
>> + devlink_health_reporter_destroy(health->empty_reporter);
>> +}
>> diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
>> index 24358385d869..657cbae50293 100644
>> --- a/drivers/net/netdevsim/netdevsim.h
>> +++ b/drivers/net/netdevsim/netdevsim.h
>> @@ -18,6 +18,7 @@
>> #include <linux/list.h>
>> #include <linux/netdevice.h>
>> #include <linux/u64_stats_sync.h>
>> +#include <linux/debugfs.h>
>
>I don't think this include is needed? Forward declaration of
>struct dentry, should be sufficient, if needed, no?
Right.
>
>> #include <net/devlink.h>
>> #include <net/xdp.h>
>>
>> @@ -134,6 +135,18 @@ enum nsim_resource_id {
>> NSIM_RESOURCE_IPV6_FIB_RULES,
>> };
>>
>> +struct nsim_dev_health {
>> + struct devlink_health_reporter *empty_reporter;
>> + struct devlink_health_reporter *dummy_reporter;
>> + struct dentry *ddir;
>> + char *recovered_break_msg;
>> + u32 binary_len;
>> + bool fail_recover;
>> +};
>> +
>> +int nsim_dev_health_init(struct nsim_dev *nsim_dev, struct devlink *devlink);
>> +void nsim_dev_health_exit(struct nsim_dev *nsim_dev);
>> +
>> struct nsim_dev_port {
>> struct list_head list;
>> struct devlink_port devlink_port;
>> @@ -164,6 +177,7 @@ struct nsim_dev {
>> bool dont_allow_reload;
>> bool fail_reload;
>> struct devlink_region *dummy_region;
>> + struct nsim_dev_health health;
>> };
>>
>> static inline struct net *nsim_dev_net(struct nsim_dev *nsim_dev)
>
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