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netdevsim: Add max_vfs to bus_dev

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Currently there is no limit to the number of VFs netdevsim can enable.
In a real systems this value exist and used by the driver.
Fore example, some features might need to consider this value when
allocating memory.

Expose max_vfs variable to debugfs as configurable resource. If are VFs
configured (num_vfs != 0) then changing of max_vfs not allowed.

Co-developed-by: Yuval Avnery <yuvalav@nvidia.com>
Signed-off-by: Yuval Avnery <yuvalav@nvidia.com>
Signed-off-by: Dmytro Linkin <dlinkin@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmytro Linkin
2021-06-02 15:17:14 +03:00
committed by David S. Miller
parent 53c7bb5530
commit d395381909
3 changed files with 112 additions and 8 deletions
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10
drivers/net/netdevsim/netdevsim.h
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@@ -212,6 +212,7 @@ struct nsim_dev {
struct dentry *ddir;
struct dentry *ports_ddir;
struct dentry *take_snapshot;
struct dentry *max_vfs;
struct bpf_offload_dev *bpf_dev;
bool bpf_bind_accept;
bool bpf_bind_verifier_accept;
@@ -269,6 +270,13 @@ void nsim_fib_destroy(struct devlink *devlink, struct nsim_fib_data *fib_data);
u64 nsim_fib_get_val(struct nsim_fib_data *fib_data,
enum nsim_resource_id res_id, bool max);
ssize_t nsim_bus_dev_max_vfs_read(struct file *file,
char __user *data,
size_t count, loff_t *ppos);
ssize_t nsim_bus_dev_max_vfs_write(struct file *file,
const char __user *data,
size_t count, loff_t *ppos);
#if IS_ENABLED(CONFIG_XFRM_OFFLOAD)
void nsim_ipsec_init(struct netdevsim *ns);
void nsim_ipsec_teardown(struct netdevsim *ns);
@@ -308,7 +316,9 @@ struct nsim_bus_dev {
struct net *initial_net; /* Purpose of this is to carry net pointer
* during the probe time only.
*/
unsigned int max_vfs;
unsigned int num_vfs;
struct mutex vfs_lock; /* Protects vfconfigs */
struct nsim_vf_config *vfconfigs;
/* Lock for devlink->reload_enabled in netdevsim module */
struct mutex nsim_bus_reload_lock;