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Date: Wed, 29 May 2019 11:17:19 +0000
From: Leon Romanovsky <leonro@...lanox.com>
To: Doug Ledford <dledford@...hat.com>,
Jason Gunthorpe <jgg@...lanox.com>
CC: RDMA mailing list <linux-rdma@...r.kernel.org>,
Majd Dibbiny <majd@...lanox.com>,
Mark Zhang <markz@...lanox.com>,
Saeed Mahameed <saeedm@...lanox.com>,
linux-netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH rdma-next v2 13/17] RDMA/core: Get sum value of all
counters when perform a sysfs stat read
On Mon, Apr 29, 2019 at 11:34:49AM +0300, Leon Romanovsky wrote:
> From: Mark Zhang <markz@...lanox.com>
>
> Since a QP can only be bound to one counter, then if it is bound to a
> separate counter, for backward compatibility purpose, the statistic
> value must be:
> * stat of default counter
> + stat of all running allocated counters
> + stat of all deallocated counters (history stats)
>
> Signed-off-by: Mark Zhang <markz@...lanox.com>
> Reviewed-by: Majd Dibbiny <majd@...lanox.com>
> Signed-off-by: Leon Romanovsky <leonro@...lanox.com>
> ---
> drivers/infiniband/core/counters.c | 99 +++++++++++++++++++++++++++++-
> drivers/infiniband/core/device.c | 8 ++-
> drivers/infiniband/core/sysfs.c | 10 ++-
> include/rdma/rdma_counter.h | 5 +-
> 4 files changed, 113 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/infiniband/core/counters.c b/drivers/infiniband/core/counters.c
> index 36cd9eca1e46..f598b1cdb241 100644
> --- a/drivers/infiniband/core/counters.c
> +++ b/drivers/infiniband/core/counters.c
> @@ -146,6 +146,20 @@ static int __rdma_counter_bind_qp(struct rdma_counter *counter,
> return ret;
> }
>
> +static void counter_history_stat_update(const struct rdma_counter *counter)
> +{
> + struct ib_device *dev = counter->device;
> + struct rdma_port_counter *port_counter;
> + int i;
> +
> + port_counter = &dev->port_data[counter->port].port_counter;
> + if (!port_counter->hstats)
> + return;
> +
> + for (i = 0; i < counter->stats->num_counters; i++)
> + port_counter->hstats->value[i] += counter->stats->value[i];
> +}
> +
> static int __rdma_counter_unbind_qp(struct ib_qp *qp, bool force)
> {
> struct rdma_counter *counter = qp->counter;
> @@ -285,8 +299,10 @@ int rdma_counter_unbind_qp(struct ib_qp *qp, bool force)
> return ret;
>
> rdma_restrack_put(&counter->res);
> - if (atomic_dec_and_test(&counter->usecnt))
> + if (atomic_dec_and_test(&counter->usecnt)) {
> + counter_history_stat_update(counter);
> rdma_counter_dealloc(counter);
> + }
>
> return 0;
> }
> @@ -307,21 +323,98 @@ int rdma_counter_query_stats(struct rdma_counter *counter)
> return ret;
> }
>
> -void rdma_counter_init(struct ib_device *dev)
> +static u64 get_running_counters_hwstat_sum(struct ib_device *dev,
> + u8 port, u32 index)
> +{
> + struct rdma_restrack_entry *res;
> + struct rdma_restrack_root *rt;
> + struct rdma_counter *counter;
> + unsigned long id = 0;
> + u64 sum = 0;
> +
> + rt = &dev->res[RDMA_RESTRACK_COUNTER];
> + xa_lock(&rt->xa);
> + xa_for_each(&rt->xa, id, res) {
> + if (!rdma_restrack_get(res))
> + continue;
> +
> + counter = container_of(res, struct rdma_counter, res);
> + if ((counter->device != dev) || (counter->port != port))
> + goto next;
> +
> + if (rdma_counter_query_stats(counter))
> + goto next;
> +
> + sum += counter->stats->value[index];
> +next:
> + rdma_restrack_put(res);
> + }
> +
> + xa_unlock(&rt->xa);
> + return sum;
> +}
> +
> +/**
> + * rdma_counter_get_hwstat_value() - Get the sum value of all counters on a
> + * specific port, including the running ones and history data
> + */
> +u64 rdma_counter_get_hwstat_value(struct ib_device *dev, u8 port, u32 index)
> +{
> + struct rdma_port_counter *port_counter;
> + u64 sum;
> +
> + if (!rdma_is_port_valid(dev, port))
> + return -EINVAL;
> +
> + port_counter = &dev->port_data[port].port_counter;
> + if (index >= port_counter->hstats->num_counters)
> + return -EINVAL;
> +
> + sum = get_running_counters_hwstat_sum(dev, port, index);
> + sum += port_counter->hstats->value[index];
> +
> + return sum;
This function is wrong, it can't return negative value (error) while
return type is declared as u64.
> +}
> +
> +int rdma_counter_init(struct ib_device *dev)
> {
> struct rdma_port_counter *port_counter;
> u32 port;
>
> if (!dev->ops.alloc_hw_stats)
> - return;
> + return 0;
>
> rdma_for_each_port(dev, port) {
> port_counter = &dev->port_data[port].port_counter;
> port_counter->mode.mode = RDMA_COUNTER_MODE_NONE;
> mutex_init(&port_counter->lock);
> +
> + port_counter->hstats = dev->ops.alloc_hw_stats(dev, port);
> + if (!port_counter->hstats)
> + goto fail;
> }
> +
> + return 0;
> +
> +fail:
> + rdma_for_each_port(dev, port) {
> + port_counter = &dev->port_data[port].port_counter;
> + kfree(port_counter->hstats);
> + }
> +
> + return -ENOMEM;
> }
>
> void rdma_counter_cleanup(struct ib_device *dev)
> {
> + struct rdma_port_counter *port_counter;
> + u32 port;
> +
> + if (!dev->ops.alloc_hw_stats)
> + return;
> +
> + rdma_for_each_port(dev, port) {
> + port_counter = &dev->port_data[port].port_counter;
> + kfree(port_counter->hstats);
> + }
> }
> diff --git a/drivers/infiniband/core/device.c b/drivers/infiniband/core/device.c
> index c56ffc61ab1e..8ae4906a60e7 100644
> --- a/drivers/infiniband/core/device.c
> +++ b/drivers/infiniband/core/device.c
> @@ -1255,7 +1255,11 @@ int ib_register_device(struct ib_device *device, const char *name)
> goto dev_cleanup;
> }
>
> - rdma_counter_init(device);
> + ret = rdma_counter_init(device);
> + if (ret) {
> + dev_warn(&device->dev, "Couldn't initialize counter\n");
> + goto sysfs_cleanup;
> + }
>
> ret = enable_device_and_get(device);
> if (ret) {
> @@ -1283,6 +1287,8 @@ int ib_register_device(struct ib_device *device, const char *name)
>
> return 0;
>
> +sysfs_cleanup:
> + ib_device_unregister_sysfs(device);
> dev_cleanup:
> device_del(&device->dev);
> cg_cleanup:
> diff --git a/drivers/infiniband/core/sysfs.c b/drivers/infiniband/core/sysfs.c
> index 2fe89754e592..8d1cf1bbb5f5 100644
> --- a/drivers/infiniband/core/sysfs.c
> +++ b/drivers/infiniband/core/sysfs.c
> @@ -43,6 +43,7 @@
> #include <rdma/ib_mad.h>
> #include <rdma/ib_pma.h>
> #include <rdma/ib_cache.h>
> +#include <rdma/rdma_counter.h>
>
> struct ib_port;
>
> @@ -795,9 +796,12 @@ static int update_hw_stats(struct ib_device *dev, struct rdma_hw_stats *stats,
> return 0;
> }
>
> -static ssize_t print_hw_stat(struct rdma_hw_stats *stats, int index, char *buf)
> +static ssize_t print_hw_stat(struct ib_device *dev, int port_num,
> + struct rdma_hw_stats *stats, int index, char *buf)
> {
> - return sprintf(buf, "%llu\n", stats->value[index]);
> + u64 v = rdma_counter_get_hwstat_value(dev, port_num, index);
> +
> + return sprintf(buf, "%llu\n", stats->value[index] + v);
> }
>
> static ssize_t show_hw_stats(struct kobject *kobj, struct attribute *attr,
> @@ -823,7 +827,7 @@ static ssize_t show_hw_stats(struct kobject *kobj, struct attribute *attr,
> ret = update_hw_stats(dev, stats, hsa->port_num, hsa->index);
> if (ret)
> goto unlock;
> - ret = print_hw_stat(stats, hsa->index, buf);
> + ret = print_hw_stat(dev, hsa->port_num, stats, hsa->index, buf);
> unlock:
> mutex_unlock(&stats->lock);
>
> diff --git a/include/rdma/rdma_counter.h b/include/rdma/rdma_counter.h
> index 4bc62909a638..5ad86ae67cc5 100644
> --- a/include/rdma/rdma_counter.h
> +++ b/include/rdma/rdma_counter.h
> @@ -27,6 +27,7 @@ struct rdma_counter_mode {
>
> struct rdma_port_counter {
> struct rdma_counter_mode mode;
> + struct rdma_hw_stats *hstats;
> struct mutex lock;
> };
>
> @@ -41,13 +42,13 @@ struct rdma_counter {
> u8 port;
> };
>
> -void rdma_counter_init(struct ib_device *dev);
> +int rdma_counter_init(struct ib_device *dev);
> void rdma_counter_cleanup(struct ib_device *dev);
> int rdma_counter_set_auto_mode(struct ib_device *dev, u8 port,
> bool on, enum rdma_nl_counter_mask mask);
> int rdma_counter_bind_qp_auto(struct ib_qp *qp, u8 port);
> int rdma_counter_unbind_qp(struct ib_qp *qp, bool force);
> -
> int rdma_counter_query_stats(struct rdma_counter *counter);
> +u64 rdma_counter_get_hwstat_value(struct ib_device *dev, u8 port, u32 index);
>
> #endif /* _RDMA_COUNTER_H_ */
> --
> 2.20.1
>
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