From 4418f862d675011a242a4e687d74ea107e6a40ed Mon Sep 17 00:00:00 2001 From: Jiri Pirko Date: Thu, 15 Aug 2019 15:46:33 +0200 Subject: [PATCH] netdevsim: implement support for devlink region and snapshots Implement dummy region of size 32K and allow user to create snapshots or random data using debugfs file trigger. Signed-off-by: Jiri Pirko Reviewed-by: Jakub Kicinski Signed-off-by: David S. Miller --- drivers/net/netdevsim/dev.c | 63 ++++++++++++++++++++++++++++++- drivers/net/netdevsim/netdevsim.h | 1 + 2 files changed, 63 insertions(+), 1 deletion(-) diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c index 08ca59fc189b..a570da406d1d 100644 --- a/drivers/net/netdevsim/dev.c +++ b/drivers/net/netdevsim/dev.c @@ -27,6 +27,41 @@ static struct dentry *nsim_dev_ddir; +#define NSIM_DEV_DUMMY_REGION_SIZE (1024 * 32) + +static ssize_t nsim_dev_take_snapshot_write(struct file *file, + const char __user *data, + size_t count, loff_t *ppos) +{ + struct nsim_dev *nsim_dev = file->private_data; + void *dummy_data; + int err; + u32 id; + + dummy_data = kmalloc(NSIM_DEV_DUMMY_REGION_SIZE, GFP_KERNEL); + if (!dummy_data) + return -ENOMEM; + + get_random_bytes(dummy_data, NSIM_DEV_DUMMY_REGION_SIZE); + + id = devlink_region_shapshot_id_get(priv_to_devlink(nsim_dev)); + err = devlink_region_snapshot_create(nsim_dev->dummy_region, + dummy_data, id, kfree); + if (err) { + pr_err("Failed to create region snapshot\n"); + kfree(dummy_data); + return err; + } + + return count; +} + +static const struct file_operations nsim_dev_take_snapshot_fops = { + .open = simple_open, + .write = nsim_dev_take_snapshot_write, + .llseek = generic_file_llseek, +}; + static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev) { char dev_ddir_name[16]; @@ -44,6 +79,8 @@ static int nsim_dev_debugfs_init(struct nsim_dev *nsim_dev) &nsim_dev->max_macs); debugfs_create_bool("test1", 0600, nsim_dev->ddir, &nsim_dev->test1); + debugfs_create_file("take_snapshot", 0200, nsim_dev->ddir, nsim_dev, + &nsim_dev_take_snapshot_fops); return 0; } @@ -248,6 +285,23 @@ static void nsim_devlink_param_load_driverinit_values(struct devlink *devlink) nsim_dev->test1 = saved_value.vbool; } +#define NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX 16 + +static int nsim_dev_dummy_region_init(struct nsim_dev *nsim_dev, + struct devlink *devlink) +{ + nsim_dev->dummy_region = + devlink_region_create(devlink, "dummy", + NSIM_DEV_DUMMY_REGION_SNAPSHOT_MAX, + NSIM_DEV_DUMMY_REGION_SIZE); + return PTR_ERR_OR_ZERO(nsim_dev->dummy_region); +} + +static void nsim_dev_dummy_region_exit(struct nsim_dev *nsim_dev) +{ + devlink_region_destroy(nsim_dev->dummy_region); +} + static int nsim_dev_reload(struct devlink *devlink, struct netlink_ext_ack *extack) { @@ -363,10 +417,14 @@ nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev, unsigned int port_count) goto err_dl_unregister; nsim_devlink_set_params_init_values(nsim_dev, devlink); - err = nsim_dev_debugfs_init(nsim_dev); + err = nsim_dev_dummy_region_init(nsim_dev, devlink); if (err) goto err_params_unregister; + err = nsim_dev_debugfs_init(nsim_dev); + if (err) + goto err_dummy_region_exit; + err = nsim_bpf_dev_init(nsim_dev); if (err) goto err_debugfs_exit; @@ -376,6 +434,8 @@ nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev, unsigned int port_count) err_debugfs_exit: nsim_dev_debugfs_exit(nsim_dev); +err_dummy_region_exit: + nsim_dev_dummy_region_exit(nsim_dev); err_params_unregister: devlink_params_unregister(devlink, nsim_devlink_params, ARRAY_SIZE(nsim_devlink_params)); @@ -396,6 +456,7 @@ static void nsim_dev_destroy(struct nsim_dev *nsim_dev) nsim_bpf_dev_exit(nsim_dev); nsim_dev_debugfs_exit(nsim_dev); + nsim_dev_dummy_region_exit(nsim_dev); devlink_params_unregister(devlink, nsim_devlink_params, ARRAY_SIZE(nsim_devlink_params)); devlink_unregister(devlink); diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h index 95751a817508..4c758c6919f5 100644 --- a/drivers/net/netdevsim/netdevsim.h +++ b/drivers/net/netdevsim/netdevsim.h @@ -160,6 +160,7 @@ struct nsim_dev { bool fw_update_status; u32 max_macs; bool test1; + struct devlink_region *dummy_region; }; int nsim_dev_init(void); -- 2.30.2