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Date: Thu, 3 Oct 2019 07:37:52 +0200
From: Jiri Pirko <jiri@...nulli.us>
To: Jakub Kicinski <jakub.kicinski@...ronome.com>
Cc: netdev@...r.kernel.org, davem@...emloft.net, idosch@...lanox.com,
dsahern@...il.com, tariqt@...lanox.com, saeedm@...lanox.com,
kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org, shuah@...nel.org,
mlxsw@...lanox.com
Subject: Re: [patch net-next v2 11/15] netdevsim: implement proper devlink
reload
Thu, Oct 03, 2019 at 02:38:12AM CEST, jakub.kicinski@...ronome.com wrote:
>On Wed, 2 Oct 2019 18:12:27 +0200, Jiri Pirko wrote:
>> From: Jiri Pirko <jiri@...lanox.com>
>>
>> During devlink reload, all driver objects should be reinstantiated with
>> the exception of devlink instance and devlink resources and params.
>> Move existing devlink_resource_size_get() calls into fib_create() just
>> before fib notifier is registered. Also, make sure that extack is
>> propagated down to fib_notifier_register() call.
>>
>> Signed-off-by: Jiri Pirko <jiri@...lanox.com>
>> ---
>> v1->v2:
>> - don't reinstantiate debugfs during reload.
>> ---
>> drivers/net/netdevsim/dev.c | 160 +++++++++++++++++-------------
>> drivers/net/netdevsim/fib.c | 53 +++++-----
>> drivers/net/netdevsim/netdevsim.h | 8 +-
>> 3 files changed, 124 insertions(+), 97 deletions(-)
>>
>> diff --git a/drivers/net/netdevsim/dev.c b/drivers/net/netdevsim/dev.c
>> index 3cc101aee991..c04312359e4f 100644
>> --- a/drivers/net/netdevsim/dev.c
>> +++ b/drivers/net/netdevsim/dev.c
>> @@ -469,37 +469,28 @@ static void nsim_dev_traps_exit(struct devlink *devlink)
>> kfree(nsim_dev->trap_data);
>> }
>>
>> +static struct nsim_dev *
>> +nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev, struct nsim_dev *nsim_dev,
>> + struct netlink_ext_ack *extack);
>> +static void nsim_dev_destroy(struct nsim_dev *nsim_dev, bool reload);
>> +
>> static int nsim_dev_reload_down(struct devlink *devlink,
>> struct netlink_ext_ack *extack)
>> {
>> + struct nsim_dev *nsim_dev = devlink_priv(devlink);
>> +
>> + nsim_dev_destroy(nsim_dev, true);
>> return 0;
>> }
>>
>> static int nsim_dev_reload_up(struct devlink *devlink,
>> struct netlink_ext_ack *extack)
>> +
>
>Stray new line.
Oups.
>
>> {
>> struct nsim_dev *nsim_dev = devlink_priv(devlink);
>> - enum nsim_resource_id res_ids[] = {
>> - NSIM_RESOURCE_IPV4_FIB, NSIM_RESOURCE_IPV4_FIB_RULES,
>> - NSIM_RESOURCE_IPV6_FIB, NSIM_RESOURCE_IPV6_FIB_RULES
>> - };
>> - int i;
>>
>> - for (i = 0; i < ARRAY_SIZE(res_ids); ++i) {
>> - int err;
>> - u64 val;
>> -
>> - err = devlink_resource_size_get(devlink, res_ids[i], &val);
>> - if (!err) {
>> - err = nsim_fib_set_max(nsim_dev->fib_data,
>> - res_ids[i], val, extack);
>> - if (err)
>> - return err;
>> - }
>> - }
>> - nsim_devlink_param_load_driverinit_values(devlink);
>> -
>> - return 0;
>> + nsim_dev = nsim_dev_create(nsim_dev->nsim_bus_dev, nsim_dev, extack);
>> + return PTR_ERR_OR_ZERO(nsim_dev);
>> }
>>
>> #define NSIM_DEV_FLASH_SIZE 500000
>> @@ -688,15 +679,21 @@ static int nsim_dev_port_add_all(struct nsim_dev *nsim_dev,
>> }
>>
>> static struct nsim_dev *
>> -nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev)
>> +nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev, struct nsim_dev *nsim_dev,
>> + struct netlink_ext_ack *extack)
>> {
>> - struct nsim_dev *nsim_dev;
>> + bool reload = !!nsim_dev;
>> struct devlink *devlink;
>> int err;
>>
>> - devlink = devlink_alloc(&nsim_dev_devlink_ops, sizeof(*nsim_dev));
>> - if (!devlink)
>> - return ERR_PTR(-ENOMEM);
>> + if (!reload) {
>> + devlink = devlink_alloc(&nsim_dev_devlink_ops,
>> + sizeof(*nsim_dev));
>> + if (!devlink)
>> + return ERR_PTR(-ENOMEM);
>> + } else {
>> + devlink = priv_to_devlink(nsim_dev);
>> + }
>> nsim_dev = devlink_priv(devlink);
>> nsim_dev->nsim_bus_dev = nsim_bus_dev;
>> nsim_dev->switch_id.id_len = sizeof(nsim_dev->switch_id.id);
>> @@ -704,28 +701,35 @@ nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev)
>> INIT_LIST_HEAD(&nsim_dev->port_list);
>> mutex_init(&nsim_dev->port_list_lock);
>> nsim_dev->fw_update_status = true;
>> - nsim_dev->max_macs = NSIM_DEV_MAX_MACS_DEFAULT;
>> - nsim_dev->test1 = NSIM_DEV_TEST1_DEFAULT;
>>
>> - err = nsim_dev_resources_register(devlink);
>> - if (err)
>> - goto err_devlink_free;
>> + if (!reload) {
>> + err = nsim_dev_resources_register(devlink);
>> + if (err)
>> + goto err_devlink_free;
>> + }
>>
>> - nsim_dev->fib_data = nsim_fib_create(devlink);
>> + nsim_dev->fib_data = nsim_fib_create(devlink, extack);
>> if (IS_ERR(nsim_dev->fib_data)) {
>> err = PTR_ERR(nsim_dev->fib_data);
>> goto err_resources_unregister;
>> }
>>
>> - err = devlink_register(devlink, &nsim_bus_dev->dev);
>> - if (err)
>> - goto err_fib_destroy;
>> + if (!reload) {
>> + nsim_dev->max_macs = NSIM_DEV_MAX_MACS_DEFAULT;
>> + nsim_dev->test1 = NSIM_DEV_TEST1_DEFAULT;
>>
>> - err = devlink_params_register(devlink, nsim_devlink_params,
>> - ARRAY_SIZE(nsim_devlink_params));
>> - if (err)
>> - goto err_dl_unregister;
>> - nsim_devlink_set_params_init_values(nsim_dev, devlink);
>> + err = devlink_register(devlink, &nsim_bus_dev->dev);
>> + if (err)
>> + goto err_fib_destroy;
>> +
>> + err = devlink_params_register(devlink, nsim_devlink_params,
>> + ARRAY_SIZE(nsim_devlink_params));
>> + if (err)
>> + goto err_dl_unregister;
>> + nsim_devlink_set_params_init_values(nsim_dev, devlink);
>> + } else {
>> + nsim_devlink_param_load_driverinit_values(devlink);
>> + }
>>
>> err = nsim_dev_dummy_region_init(nsim_dev, devlink);
>> if (err)
>> @@ -735,66 +739,86 @@ nsim_dev_create(struct nsim_bus_dev *nsim_bus_dev)
>> if (err)
>> goto err_dummy_region_exit;
>>
>> - err = nsim_dev_debugfs_init(nsim_dev);
>> - if (err)
>> - goto err_traps_exit;
>> + if (!reload) {
>> + err = nsim_dev_debugfs_init(nsim_dev);
>> + if (err)
>> + goto err_traps_exit;
>>
>> - err = nsim_bpf_dev_init(nsim_dev);
>> - if (err)
>> - goto err_debugfs_exit;
>> + err = nsim_bpf_dev_init(nsim_dev);
>> + if (err)
>> + goto err_debugfs_exit;
>> + }
>>
>> err = nsim_dev_port_add_all(nsim_dev, nsim_bus_dev->port_count);
>> if (err)
>> goto err_bpf_dev_exit;
>>
>> - devlink_params_publish(devlink);
>> + if (reload)
>> + devlink_params_publish(devlink);
>>
>> return nsim_dev;
>>
>> err_bpf_dev_exit:
>> - nsim_bpf_dev_exit(nsim_dev);
>> + if (!reload) {
>> + nsim_bpf_dev_exit(nsim_dev);
>> err_debugfs_exit:
>> - nsim_dev_debugfs_exit(nsim_dev);
>> + nsim_dev_debugfs_exit(nsim_dev);
>> + }
>> err_traps_exit:
>> nsim_dev_traps_exit(devlink);
>> 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));
>> + if (!reload) {
>> + devlink_params_unregister(devlink, nsim_devlink_params,
>> + ARRAY_SIZE(nsim_devlink_params));
>> err_dl_unregister:
>> - devlink_unregister(devlink);
>> + devlink_unregister(devlink);
>> + }
>> err_fib_destroy:
>> nsim_fib_destroy(devlink, nsim_dev->fib_data);
>> err_resources_unregister:
>> - devlink_resources_unregister(devlink, NULL);
>> + if (!reload) {
>> + devlink_resources_unregister(devlink, NULL);
>> err_devlink_free:
>> - devlink_free(devlink);
>> + devlink_free(devlink);
>> + }
>> return ERR_PTR(err);
>
>All this if (reload) code looks pretty ugly :/
>
>I'd say create function should create, and destroy destroy, rather than
>do only half of the job based on some extra parameter :(
Okay. I wanted to avoid duplication. Will do.
>
>> }
>>
>> -static void nsim_dev_destroy(struct nsim_dev *nsim_dev)
>> +static void nsim_dev_destroy(struct nsim_dev *nsim_dev, bool reload)
>> {
>> struct devlink *devlink = priv_to_devlink(nsim_dev);
>>
>> - nsim_dev_port_del_all(nsim_dev);
>> - nsim_bpf_dev_exit(nsim_dev);
>> - nsim_dev_debugfs_exit(nsim_dev);
>> - nsim_dev_traps_exit(devlink);
>> - nsim_dev_dummy_region_exit(nsim_dev);
>> - devlink_params_unregister(devlink, nsim_devlink_params,
>> - ARRAY_SIZE(nsim_devlink_params));
>> - devlink_unregister(devlink);
>> - nsim_fib_destroy(devlink, nsim_dev->fib_data);
>> - devlink_resources_unregister(devlink, NULL);
>> - mutex_destroy(&nsim_dev->port_list_lock);
>> - devlink_free(devlink);
>> + if (!devlink_is_reload_failed(devlink))
>> + nsim_dev_port_del_all(nsim_dev);
>> + if (!reload) {
>> + nsim_bpf_dev_exit(nsim_dev);
>> + nsim_dev_debugfs_exit(nsim_dev);
>> + }
>> + if (!devlink_is_reload_failed(devlink)) {
>> + nsim_dev_traps_exit(devlink);
>> + nsim_dev_dummy_region_exit(nsim_dev);
>> + mutex_destroy(&nsim_dev->port_list_lock);
>> + }
>> + if (!reload) {
>> + devlink_params_unregister(devlink, nsim_devlink_params,
>> + ARRAY_SIZE(nsim_devlink_params));
>> + devlink_unregister(devlink);
>> + }
>> + if (!devlink_is_reload_failed(devlink))
>> + nsim_fib_destroy(devlink, nsim_dev->fib_data);
>> + if (!reload) {
>> + devlink_resources_unregister(devlink, NULL);
>> + mutex_destroy(&nsim_dev->port_list_lock);
>> + devlink_free(devlink);
>> + }
>> }
>>
>> int nsim_dev_probe(struct nsim_bus_dev *nsim_bus_dev)
>> {
>> struct nsim_dev *nsim_dev;
>>
>> - nsim_dev = nsim_dev_create(nsim_bus_dev);
>> + nsim_dev = nsim_dev_create(nsim_bus_dev, NULL, NULL);
>> if (IS_ERR(nsim_dev))
>> return PTR_ERR(nsim_dev);
>> dev_set_drvdata(&nsim_bus_dev->dev, nsim_dev);
>> @@ -806,7 +830,7 @@ void nsim_dev_remove(struct nsim_bus_dev *nsim_bus_dev)
>> {
>> struct nsim_dev *nsim_dev = dev_get_drvdata(&nsim_bus_dev->dev);
>>
>> - nsim_dev_destroy(nsim_dev);
>> + nsim_dev_destroy(nsim_dev, false);
>> }
>>
>> static struct nsim_dev_port *
>> diff --git a/drivers/net/netdevsim/fib.c b/drivers/net/netdevsim/fib.c
>> index d2aeac0f4c2c..fdc682f3a09a 100644
>> --- a/drivers/net/netdevsim/fib.c
>> +++ b/drivers/net/netdevsim/fib.c
>> @@ -63,12 +63,10 @@ u64 nsim_fib_get_val(struct nsim_fib_data *fib_data,
>> return max ? entry->max : entry->num;
>> }
>>
>> -int nsim_fib_set_max(struct nsim_fib_data *fib_data,
>> - enum nsim_resource_id res_id, u64 val,
>> - struct netlink_ext_ack *extack)
>> +static void nsim_fib_set_max(struct nsim_fib_data *fib_data,
>> + enum nsim_resource_id res_id, u64 val)
>> {
>> struct nsim_fib_entry *entry;
>> - int err = 0;
>>
>> switch (res_id) {
>> case NSIM_RESOURCE_IPV4_FIB:
>> @@ -84,20 +82,10 @@ int nsim_fib_set_max(struct nsim_fib_data *fib_data,
>> entry = &fib_data->ipv6.rules;
>> break;
>> default:
>> - return 0;
>> - }
>> -
>> - /* not allowing a new max to be less than curren occupancy
>> - * --> no means of evicting entries
>> - */
>> - if (val < entry->num) {
>> - NL_SET_ERR_MSG_MOD(extack, "New size is less than current occupancy");
>> - err = -EINVAL;
>> - } else {
>> - entry->max = val;
>> + WARN_ON(1);
>> + return;
>> }
>> -
>> - return err;
>> + entry->max = val;
>> }
>>
>> static int nsim_fib_rule_account(struct nsim_fib_entry *entry, bool add,
>> @@ -239,7 +227,28 @@ static u64 nsim_fib_ipv6_rules_res_occ_get(void *priv)
>> return nsim_fib_get_val(data, NSIM_RESOURCE_IPV6_FIB_RULES, false);
>> }
>>
>> -struct nsim_fib_data *nsim_fib_create(struct devlink *devlink)
>> +static void nsim_fib_set_max_all(struct nsim_fib_data *data,
>> + struct devlink *devlink)
>> +{
>> + enum nsim_resource_id res_ids[] = {
>> + NSIM_RESOURCE_IPV4_FIB, NSIM_RESOURCE_IPV4_FIB_RULES,
>> + NSIM_RESOURCE_IPV6_FIB, NSIM_RESOURCE_IPV6_FIB_RULES
>> + };
>> + int i;
>> +
>> + for (i = 0; i < ARRAY_SIZE(res_ids); i++) {
>> + int err;
>> + u64 val;
>> +
>> + err = devlink_resource_size_get(devlink, res_ids[i], &val);
>> + if (err)
>> + val = (u64) -1;
>> + nsim_fib_set_max(data, res_ids[i], val);
>> + }
>> +}
>> +
>> +struct nsim_fib_data *nsim_fib_create(struct devlink *devlink,
>> + struct netlink_ext_ack *extack)
>> {
>> struct nsim_fib_data *data;
>> int err;
>> @@ -248,15 +257,11 @@ struct nsim_fib_data *nsim_fib_create(struct devlink *devlink)
>> if (!data)
>> return ERR_PTR(-ENOMEM);
>>
>> - data->ipv4.fib.max = (u64)-1;
>> - data->ipv4.rules.max = (u64)-1;
>> -
>> - data->ipv6.fib.max = (u64)-1;
>> - data->ipv6.rules.max = (u64)-1;
>> + nsim_fib_set_max_all(data, devlink);
>>
>> data->fib_nb.notifier_call = nsim_fib_event_nb;
>> err = register_fib_notifier(&init_net, &data->fib_nb,
>> - nsim_fib_dump_inconsistent, NULL);
>> + nsim_fib_dump_inconsistent, extack);
>> if (err) {
>> pr_err("Failed to register fib notifier\n");
>> goto err_out;
>> diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h
>> index ac506cf253b6..702d951fe160 100644
>> --- a/drivers/net/netdevsim/netdevsim.h
>> +++ b/drivers/net/netdevsim/netdevsim.h
>> @@ -173,13 +173,11 @@ int nsim_dev_port_add(struct nsim_bus_dev *nsim_bus_dev,
>> int nsim_dev_port_del(struct nsim_bus_dev *nsim_bus_dev,
>> unsigned int port_index);
>>
>> -struct nsim_fib_data *nsim_fib_create(struct devlink *devlink);
>> -void nsim_fib_destroy(struct devlink *devlink, struct nsim_fib_data *data);
>> +struct nsim_fib_data *nsim_fib_create(struct devlink *devlink,
>> + struct netlink_ext_ack *extack);
>> +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);
>> -int nsim_fib_set_max(struct nsim_fib_data *fib_data,
>> - enum nsim_resource_id res_id, u64 val,
>> - struct netlink_ext_ack *extack);
>>
>> #if IS_ENABLED(CONFIG_XFRM_OFFLOAD)
>> void nsim_ipsec_init(struct netdevsim *ns);
>
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