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Date: Thu, 24 Jan 2019 07:45:05 +0000
From: Eran Ben Elisha <eranbe@...lanox.com>
To: Jiri Pirko <jiri@...nulli.us>
CC: "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
Jiri Pirko <jiri@...lanox.com>,
"David S. Miller" <davem@...emloft.net>,
Saeed Mahameed <saeedm@...lanox.com>,
Moshe Shemesh <moshe@...lanox.com>
Subject: Re: [PATCH net-next 3/7] devlink: move devlink health reporter to use
devlink msg API
On 1/23/2019 4:42 PM, Jiri Pirko wrote:
> Tue, Jan 22, 2019 at 04:57:20PM CET, eranbe@...lanox.com wrote:
>> Move devlink reporter diagnose and dump operations to use the new msg API.
>> Redefine the signature of diagnose and dump operations and move the mlx5e
>> reporter to use it with the new format.
>>
>> Signed-off-by: Eran Ben Elisha <eranbe@...lanox.com>
>> Reviewed-by: Moshe Shemesh <moshe@...lanox.com>
>> ---
>> .../mellanox/mlx5/core/en/reporter_tx.c | 1 +
>> include/net/devlink.h | 9 +-
>> net/core/devlink.c | 95 +++++--------------
>> 3 files changed, 28 insertions(+), 77 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
>> index fc92850c214a..7238cda670ba 100644
>> --- a/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
>> +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/reporter_tx.c
>> @@ -264,6 +264,7 @@ static int mlx5e_tx_reporter_diagnose(struct devlink_health_reporter *reporter,
>> static const struct devlink_health_reporter_ops mlx5_tx_reporter_ops = {
>> .name = "TX",
>> .recover = mlx5e_tx_reporter_recover,
>> + .diagnose = mlx5e_tx_reporter_diagnose,
>
> Unrelated to this patch.
ack.
>
>
>> };
>>
>> #define MLX5_REPORTER_TX_GRACEFUL_PERIOD 500
>> diff --git a/include/net/devlink.h b/include/net/devlink.h
>> index fe323e9b14e1..d66de8b80cc2 100644
>> --- a/include/net/devlink.h
>> +++ b/include/net/devlink.h
>> @@ -442,17 +442,12 @@ struct devlink_health_reporter;
>>
>> struct devlink_health_reporter_ops {
>> char *name;
>> - unsigned int dump_size;
>> - unsigned int diagnose_size;
>> int (*recover)(struct devlink_health_reporter *reporter,
>> void *priv_ctx);
>> int (*dump)(struct devlink_health_reporter *reporter,
>> - struct devlink_health_buffer **buffers_array,
>> - unsigned int buffer_size, unsigned int num_buffers,
>> - void *priv_ctx);
>> + struct devlink_msg_ctx *msg_ctx, void *priv_ctx);
>> int (*diagnose)(struct devlink_health_reporter *reporter,
>> - struct devlink_health_buffer **buffers_array,
>> - unsigned int buffer_size, unsigned int num_buffers);
>> + struct devlink_msg_ctx *msg_ctx);
>> };
>>
>> struct devlink_ops {
>> diff --git a/net/core/devlink.c b/net/core/devlink.c
>> index 57ca096849b3..347b638e6f32 100644
>> --- a/net/core/devlink.c
>> +++ b/net/core/devlink.c
>> @@ -4555,10 +4555,8 @@ static int devlink_msg_snd(struct genl_info *info,
>>
>> struct devlink_health_reporter {
>> struct list_head list;
>> - struct devlink_health_buffer **dump_buffers_array;
>> + struct devlink_msg_ctx *dump_msg_ctx;
>> struct mutex dump_lock; /* lock parallel read/write from dump buffers */
>> - struct devlink_health_buffer **diagnose_buffers_array;
>> - struct mutex diagnose_lock; /* lock parallel read/write from diagnose buffers */
>
> Howcome you don't need the mutex anymore?
Now, as data is allocated on the fly while diagnose_doit(), no need to
store the diagnose over the reporter anymore. So no need for any mutex
locking in order to prepare and send it.
>
>
>> void *priv;
>> const struct devlink_health_reporter_ops *ops;
>> struct devlink *devlink;
>> @@ -4619,9 +4617,7 @@ devlink_health_reporter_create(struct devlink *devlink,
>> goto unlock;
>> }
>>
>> - if (WARN_ON(ops->dump && !ops->dump_size) ||
>> - WARN_ON(ops->diagnose && !ops->diagnose_size) ||
>> - WARN_ON(auto_recover && !ops->recover) ||
>> + if (WARN_ON(auto_recover && !ops->recover) ||
>> WARN_ON(graceful_period && !ops->recover)) {
>> reporter = ERR_PTR(-EINVAL);
>> goto unlock;
>> @@ -4633,31 +4629,8 @@ devlink_health_reporter_create(struct devlink *devlink,
>> goto unlock;
>> }
>>
>> - if (ops->dump) {
>> - reporter->dump_buffers_array =
>> - devlink_health_buffers_create(ops->dump_size);
>> - if (!reporter->dump_buffers_array) {
>> - kfree(reporter);
>> - reporter = ERR_PTR(-ENOMEM);
>> - goto unlock;
>> - }
>> - }
>> -
>> - if (ops->diagnose) {
>> - reporter->diagnose_buffers_array =
>> - devlink_health_buffers_create(ops->diagnose_size);
>> - if (!reporter->diagnose_buffers_array) {
>> - devlink_health_buffers_destroy(reporter->dump_buffers_array,
>> - DEVLINK_HEALTH_SIZE_TO_BUFFERS(ops->dump_size));
>> - kfree(reporter);
>> - reporter = ERR_PTR(-ENOMEM);
>> - goto unlock;
>> - }
>> - }
>> -
>> list_add_tail(&reporter->list, &devlink->reporter_list);
>> mutex_init(&reporter->dump_lock);
>> - mutex_init(&reporter->diagnose_lock);
>>
>> reporter->priv = priv;
>> reporter->ops = ops;
>> @@ -4680,10 +4653,8 @@ devlink_health_reporter_destroy(struct devlink_health_reporter *reporter)
>> {
>> mutex_lock(&reporter->devlink->lock);
>> list_del(&reporter->list);
>> - devlink_health_buffers_destroy(reporter->dump_buffers_array,
>> - DEVLINK_HEALTH_SIZE_TO_BUFFERS(reporter->ops->dump_size));
>> - devlink_health_buffers_destroy(reporter->diagnose_buffers_array,
>> - DEVLINK_HEALTH_SIZE_TO_BUFFERS(reporter->ops->diagnose_size));
>> + if (reporter->dump_msg_ctx)
>> + devlink_msg_ctx_free(reporter->dump_msg_ctx);
>> kfree(reporter);
>> mutex_unlock(&reporter->devlink->lock);
>> }
>> @@ -4720,12 +4691,15 @@ static int devlink_health_do_dump(struct devlink_health_reporter *reporter,
>> if (reporter->dump_avail)
>> return 0;
>>
>> - devlink_health_buffers_reset(reporter->dump_buffers_array,
>> - DEVLINK_HEALTH_SIZE_TO_BUFFERS(reporter->ops->dump_size));
>> - err = reporter->ops->dump(reporter, reporter->dump_buffers_array,
>> - DEVLINK_HEALTH_BUFFER_SIZE,
>> - DEVLINK_HEALTH_SIZE_TO_BUFFERS(reporter->ops->dump_size),
>> - priv_ctx);
>> + reporter->dump_msg_ctx = devlink_msg_ctx_alloc();
>> + if (IS_ERR_OR_NULL(reporter->dump_msg_ctx)) {
>> + err = PTR_ERR(reporter->dump_msg_ctx);
>> + reporter->dump_msg_ctx = NULL;
>> + return err;
>> + }
>> +
>> + err = reporter->ops->dump(reporter, reporter->dump_msg_ctx,
>> + priv_ctx);
>> if (!err) {
>> reporter->dump_avail = true;
>> reporter->dump_ts = jiffies;
>> @@ -4960,7 +4934,7 @@ static int devlink_nl_cmd_health_reporter_diagnose_doit(struct sk_buff *skb,
>> {
>> struct devlink *devlink = info->user_ptr[0];
>> struct devlink_health_reporter *reporter;
>> - u64 num_of_buffers;
>> + struct devlink_msg_ctx *msg_ctx;
>> int err;
>>
>> reporter = devlink_health_reporter_get_from_info(devlink, info);
>> @@ -4970,32 +4944,19 @@ static int devlink_nl_cmd_health_reporter_diagnose_doit(struct sk_buff *skb,
>> if (!reporter->ops->diagnose)
>> return -EOPNOTSUPP;
>>
>> - num_of_buffers =
>> - DEVLINK_HEALTH_SIZE_TO_BUFFERS(reporter->ops->diagnose_size);
>> + msg_ctx = devlink_msg_ctx_alloc();
>> + if (IS_ERR_OR_NULL(msg_ctx))
>> + return PTR_ERR(msg_ctx);
>>
>> - mutex_lock(&reporter->diagnose_lock);
>> - devlink_health_buffers_reset(reporter->diagnose_buffers_array,
>> - num_of_buffers);
>> -
>> - err = reporter->ops->diagnose(reporter,
>> - reporter->diagnose_buffers_array,
>> - DEVLINK_HEALTH_BUFFER_SIZE,
>> - num_of_buffers);
>> + err = reporter->ops->diagnose(reporter, msg_ctx);
>
> So this is not needed to be in reporter now? Why it was needed before?
see reply above.
>
>
>
>> if (err)
>> goto out;
>>
>> - err = devlink_health_buffer_snd(info,
>> - DEVLINK_CMD_HEALTH_REPORTER_DIAGNOSE,
>> - 0, reporter->diagnose_buffers_array,
>> - num_of_buffers);
>> - if (err)
>> - goto out;
>> -
>> - mutex_unlock(&reporter->diagnose_lock);
>> - return 0;
>> + err = devlink_msg_snd(info, DEVLINK_CMD_HEALTH_REPORTER_DIAGNOSE,
>> + 0, msg_ctx);
>>
>> out:
>> - mutex_unlock(&reporter->diagnose_lock);
>> + devlink_msg_ctx_free(msg_ctx);
>> return err;
>> }
>>
>> @@ -5004,8 +4965,8 @@ devlink_health_dump_clear(struct devlink_health_reporter *reporter)
>> {
>> reporter->dump_avail = false;
>> reporter->dump_ts = 0;
>> - devlink_health_buffers_reset(reporter->dump_buffers_array,
>> - DEVLINK_HEALTH_SIZE_TO_BUFFERS(reporter->ops->dump_size));
>> + devlink_msg_ctx_free(reporter->dump_msg_ctx);
>> + reporter->dump_msg_ctx = NULL;
>> }
>>
>> static int devlink_nl_cmd_health_reporter_dump_get_doit(struct sk_buff *skb,
>> @@ -5013,7 +4974,6 @@ static int devlink_nl_cmd_health_reporter_dump_get_doit(struct sk_buff *skb,
>> {
>> struct devlink *devlink = info->user_ptr[0];
>> struct devlink_health_reporter *reporter;
>> - u64 num_of_buffers;
>> int err;
>>
>> reporter = devlink_health_reporter_get_from_info(devlink, info);
>> @@ -5023,18 +4983,13 @@ static int devlink_nl_cmd_health_reporter_dump_get_doit(struct sk_buff *skb,
>> if (!reporter->ops->dump)
>> return -EOPNOTSUPP;
>>
>> - num_of_buffers =
>> - DEVLINK_HEALTH_SIZE_TO_BUFFERS(reporter->ops->dump_size);
>> -
>> mutex_lock(&reporter->dump_lock);
>> err = devlink_health_do_dump(reporter, NULL);
>> if (err)
>> goto out;
>>
>> - err = devlink_health_buffer_snd(info,
>> - DEVLINK_CMD_HEALTH_REPORTER_DUMP_GET,
>> - 0, reporter->dump_buffers_array,
>> - num_of_buffers);
>> + err = devlink_msg_snd(info, DEVLINK_CMD_HEALTH_REPORTER_DUMP_GET,
>> + 0, reporter->dump_msg_ctx);
>>
>> out:
>> mutex_unlock(&reporter->dump_lock);
>> --
>> 2.17.1
>>
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