linux/drivers/infiniband/core/counters.c

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// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
/*
* Copyright (c) 2019 Mellanox Technologies. All rights reserved.
*/
#include <rdma/ib_verbs.h>
#include <rdma/rdma_counter.h>
#include "core_priv.h"
#include "restrack.h"
#define ALL_AUTO_MODE_MASKS (RDMA_COUNTER_MASK_QP_TYPE)
static int __counter_set_mode(struct rdma_counter_mode *curr,
enum rdma_nl_counter_mode new_mode,
enum rdma_nl_counter_mask new_mask)
{
if ((new_mode == RDMA_COUNTER_MODE_AUTO) &&
((new_mask & (~ALL_AUTO_MODE_MASKS)) ||
(curr->mode != RDMA_COUNTER_MODE_NONE)))
return -EINVAL;
curr->mode = new_mode;
curr->mask = new_mask;
return 0;
}
/**
* rdma_counter_set_auto_mode() - Turn on/off per-port auto mode
*
* When @on is true, the @mask must be set; When @on is false, it goes
* into manual mode if there's any counter, so that the user is able to
* manually access them.
*/
int rdma_counter_set_auto_mode(struct ib_device *dev, u8 port,
bool on, enum rdma_nl_counter_mask mask)
{
struct rdma_port_counter *port_counter;
int ret;
port_counter = &dev->port_data[port].port_counter;
mutex_lock(&port_counter->lock);
if (on) {
ret = __counter_set_mode(&port_counter->mode,
RDMA_COUNTER_MODE_AUTO, mask);
} else {
if (port_counter->mode.mode != RDMA_COUNTER_MODE_AUTO) {
ret = -EINVAL;
goto out;
}
if (port_counter->num_counters)
ret = __counter_set_mode(&port_counter->mode,
RDMA_COUNTER_MODE_MANUAL, 0);
else
ret = __counter_set_mode(&port_counter->mode,
RDMA_COUNTER_MODE_NONE, 0);
}
out:
mutex_unlock(&port_counter->lock);
return ret;
}
static struct rdma_counter *rdma_counter_alloc(struct ib_device *dev, u8 port,
enum rdma_nl_counter_mode mode)
{
struct rdma_port_counter *port_counter;
struct rdma_counter *counter;
int ret;
if (!dev->ops.counter_dealloc || !dev->ops.counter_alloc_stats)
return NULL;
counter = kzalloc(sizeof(*counter), GFP_KERNEL);
if (!counter)
return NULL;
counter->device = dev;
counter->port = port;
counter->res.type = RDMA_RESTRACK_COUNTER;
counter->stats = dev->ops.counter_alloc_stats(counter);
if (!counter->stats)
goto err_stats;
port_counter = &dev->port_data[port].port_counter;
mutex_lock(&port_counter->lock);
if (mode == RDMA_COUNTER_MODE_MANUAL) {
ret = __counter_set_mode(&port_counter->mode,
RDMA_COUNTER_MODE_MANUAL, 0);
if (ret)
goto err_mode;
}
port_counter->num_counters++;
mutex_unlock(&port_counter->lock);
counter->mode.mode = mode;
kref_init(&counter->kref);
mutex_init(&counter->lock);
return counter;
err_mode:
mutex_unlock(&port_counter->lock);
kfree(counter->stats);
err_stats:
kfree(counter);
return NULL;
}
static void rdma_counter_free(struct rdma_counter *counter)
{
struct rdma_port_counter *port_counter;
port_counter = &counter->device->port_data[counter->port].port_counter;
mutex_lock(&port_counter->lock);
port_counter->num_counters--;
if (!port_counter->num_counters &&
(port_counter->mode.mode == RDMA_COUNTER_MODE_MANUAL))
__counter_set_mode(&port_counter->mode, RDMA_COUNTER_MODE_NONE,
0);
mutex_unlock(&port_counter->lock);
rdma_restrack_del(&counter->res);
kfree(counter->stats);
kfree(counter);
}
static void auto_mode_init_counter(struct rdma_counter *counter,
const struct ib_qp *qp,
enum rdma_nl_counter_mask new_mask)
{
struct auto_mode_param *param = &counter->mode.param;
counter->mode.mode = RDMA_COUNTER_MODE_AUTO;
counter->mode.mask = new_mask;
if (new_mask & RDMA_COUNTER_MASK_QP_TYPE)
param->qp_type = qp->qp_type;
}
static bool auto_mode_match(struct ib_qp *qp, struct rdma_counter *counter,
enum rdma_nl_counter_mask auto_mask)
{
struct auto_mode_param *param = &counter->mode.param;
bool match = true;
if (rdma_is_kernel_res(&counter->res) != rdma_is_kernel_res(&qp->res))
return false;
/* Ensure that counter belong to right PID */
if (!rdma_is_kernel_res(&counter->res) &&
!rdma_is_kernel_res(&qp->res) &&
(task_pid_vnr(counter->res.task) != current->pid))
return false;
if (auto_mask & RDMA_COUNTER_MASK_QP_TYPE)
match &= (param->qp_type == qp->qp_type);
return match;
}
static int __rdma_counter_bind_qp(struct rdma_counter *counter,
struct ib_qp *qp)
{
int ret;
if (qp->counter)
return -EINVAL;
if (!qp->device->ops.counter_bind_qp)
return -EOPNOTSUPP;
mutex_lock(&counter->lock);
ret = qp->device->ops.counter_bind_qp(counter, qp);
mutex_unlock(&counter->lock);
return ret;
}
static int __rdma_counter_unbind_qp(struct ib_qp *qp)
{
struct rdma_counter *counter = qp->counter;
int ret;
if (!qp->device->ops.counter_unbind_qp)
return -EOPNOTSUPP;
mutex_lock(&counter->lock);
ret = qp->device->ops.counter_unbind_qp(qp);
mutex_unlock(&counter->lock);
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];
}
/**
* rdma_get_counter_auto_mode - Find the counter that @qp should be bound
* with in auto mode
*
* Return: The counter (with ref-count increased) if found
*/
static struct rdma_counter *rdma_get_counter_auto_mode(struct ib_qp *qp,
u8 port)
{
struct rdma_port_counter *port_counter;
struct rdma_counter *counter = NULL;
struct ib_device *dev = qp->device;
struct rdma_restrack_entry *res;
struct rdma_restrack_root *rt;
unsigned long id = 0;
port_counter = &dev->port_data[port].port_counter;
rt = &dev->res[RDMA_RESTRACK_COUNTER];
xa_lock(&rt->xa);
xa_for_each(&rt->xa, id, res) {
if (!rdma_is_visible_in_pid_ns(res))
continue;
counter = container_of(res, struct rdma_counter, res);
if ((counter->device != qp->device) || (counter->port != port))
goto next;
if (auto_mode_match(qp, counter, port_counter->mode.mask))
break;
next:
counter = NULL;
}
if (counter && !kref_get_unless_zero(&counter->kref))
counter = NULL;
xa_unlock(&rt->xa);
return counter;
}
static void rdma_counter_res_add(struct rdma_counter *counter,
struct ib_qp *qp)
{
if (rdma_is_kernel_res(&qp->res)) {
rdma_restrack_set_task(&counter->res, qp->res.kern_name);
rdma_restrack_kadd(&counter->res);
} else {
rdma_restrack_attach_task(&counter->res, qp->res.task);
rdma_restrack_uadd(&counter->res);
}
}
static void counter_release(struct kref *kref)
{
struct rdma_counter *counter;
counter = container_of(kref, struct rdma_counter, kref);
counter_history_stat_update(counter);
counter->device->ops.counter_dealloc(counter);
rdma_counter_free(counter);
}
/**
* rdma_counter_bind_qp_auto - Check and bind the QP to a counter base on
* the auto-mode rule
*/
int rdma_counter_bind_qp_auto(struct ib_qp *qp, u8 port)
{
struct rdma_port_counter *port_counter;
struct ib_device *dev = qp->device;
struct rdma_counter *counter;
int ret;
if (!rdma_is_port_valid(dev, port))
return -EINVAL;
port_counter = &dev->port_data[port].port_counter;
if (port_counter->mode.mode != RDMA_COUNTER_MODE_AUTO)
return 0;
counter = rdma_get_counter_auto_mode(qp, port);
if (counter) {
ret = __rdma_counter_bind_qp(counter, qp);
if (ret) {
kref_put(&counter->kref, counter_release);
return ret;
}
} else {
counter = rdma_counter_alloc(dev, port, RDMA_COUNTER_MODE_AUTO);
if (!counter)
return -ENOMEM;
auto_mode_init_counter(counter, qp, port_counter->mode.mask);
ret = __rdma_counter_bind_qp(counter, qp);
if (ret) {
rdma_counter_free(counter);
return ret;
}
rdma_counter_res_add(counter, qp);
}
return 0;
}
/**
* rdma_counter_unbind_qp - Unbind a qp from a counter
* @force:
* true - Decrease the counter ref-count anyway (e.g., qp destroy)
*/
int rdma_counter_unbind_qp(struct ib_qp *qp, bool force)
{
struct rdma_counter *counter = qp->counter;
int ret;
if (!counter)
return -EINVAL;
ret = __rdma_counter_unbind_qp(qp);
if (ret && !force)
return ret;
kref_put(&counter->kref, counter_release);
return 0;
}
int rdma_counter_query_stats(struct rdma_counter *counter)
{
struct ib_device *dev = counter->device;
int ret;
if (!dev->ops.counter_update_stats)
return -EINVAL;
mutex_lock(&counter->lock);
ret = dev->ops.counter_update_stats(counter);
mutex_unlock(&counter->lock);
return ret;
}
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;
xa_unlock(&rt->xa);
counter = container_of(res, struct rdma_counter, res);
if ((counter->device != dev) || (counter->port != port) ||
rdma_counter_query_stats(counter))
goto next;
sum += counter->stats->value[index];
next:
xa_lock(&rt->xa);
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;
port_counter = &dev->port_data[port].port_counter;
if (!port_counter->hstats)
return 0;
sum = get_running_counters_hwstat_sum(dev, port, index);
sum += port_counter->hstats->value[index];
return sum;
}
static struct ib_qp *rdma_counter_get_qp(struct ib_device *dev, u32 qp_num)
{
struct rdma_restrack_entry *res = NULL;
struct ib_qp *qp = NULL;
res = rdma_restrack_get_byid(dev, RDMA_RESTRACK_QP, qp_num);
if (IS_ERR(res))
return NULL;
if (!rdma_is_visible_in_pid_ns(res))
goto err;
qp = container_of(res, struct ib_qp, res);
if (qp->qp_type == IB_QPT_RAW_PACKET && !capable(CAP_NET_RAW))
goto err;
return qp;
err:
rdma_restrack_put(&qp->res);
return NULL;
}
static int rdma_counter_bind_qp_manual(struct rdma_counter *counter,
struct ib_qp *qp)
{
if ((counter->device != qp->device) || (counter->port != qp->port))
return -EINVAL;
return __rdma_counter_bind_qp(counter, qp);
}
static struct rdma_counter *rdma_get_counter_by_id(struct ib_device *dev,
u32 counter_id)
{
struct rdma_restrack_entry *res;
struct rdma_counter *counter;
res = rdma_restrack_get_byid(dev, RDMA_RESTRACK_COUNTER, counter_id);
if (IS_ERR(res))
return NULL;
if (!rdma_is_visible_in_pid_ns(res)) {
rdma_restrack_put(res);
return NULL;
}
counter = container_of(res, struct rdma_counter, res);
kref_get(&counter->kref);
rdma_restrack_put(res);
return counter;
}
/**
* rdma_counter_bind_qpn() - Bind QP @qp_num to counter @counter_id
*/
int rdma_counter_bind_qpn(struct ib_device *dev, u8 port,
u32 qp_num, u32 counter_id)
{
struct rdma_counter *counter;
struct ib_qp *qp;
int ret;
qp = rdma_counter_get_qp(dev, qp_num);
if (!qp)
return -ENOENT;
counter = rdma_get_counter_by_id(dev, counter_id);
if (!counter) {
ret = -ENOENT;
goto err;
}
if (counter->res.task != qp->res.task) {
ret = -EINVAL;
goto err_task;
}
ret = rdma_counter_bind_qp_manual(counter, qp);
if (ret)
goto err_task;
rdma_restrack_put(&qp->res);
return 0;
err_task:
kref_put(&counter->kref, counter_release);
err:
rdma_restrack_put(&qp->res);
return ret;
}
/**
* rdma_counter_bind_qpn_alloc() - Alloc a counter and bind QP @qp_num to it
* The id of new counter is returned in @counter_id
*/
int rdma_counter_bind_qpn_alloc(struct ib_device *dev, u8 port,
u32 qp_num, u32 *counter_id)
{
struct rdma_counter *counter;
struct ib_qp *qp;
int ret;
if (!rdma_is_port_valid(dev, port))
return -EINVAL;
qp = rdma_counter_get_qp(dev, qp_num);
if (!qp)
return -ENOENT;
if (rdma_is_port_valid(dev, qp->port) && (qp->port != port)) {
ret = -EINVAL;
goto err;
}
counter = rdma_counter_alloc(dev, port, RDMA_COUNTER_MODE_MANUAL);
if (!counter) {
ret = -ENOMEM;
goto err;
}
ret = rdma_counter_bind_qp_manual(counter, qp);
if (ret)
goto err_bind;
if (counter_id)
*counter_id = counter->id;
rdma_counter_res_add(counter, qp);
rdma_restrack_put(&qp->res);
return ret;
err_bind:
rdma_counter_free(counter);
err:
rdma_restrack_put(&qp->res);
return ret;
}
/**
* rdma_counter_unbind_qpn() - Unbind QP @qp_num from a counter
*/
int rdma_counter_unbind_qpn(struct ib_device *dev, u8 port,
u32 qp_num, u32 counter_id)
{
struct rdma_port_counter *port_counter;
struct ib_qp *qp;
int ret;
if (!rdma_is_port_valid(dev, port))
return -EINVAL;
qp = rdma_counter_get_qp(dev, qp_num);
if (!qp)
return -ENOENT;
if (rdma_is_port_valid(dev, qp->port) && (qp->port != port)) {
ret = -EINVAL;
goto out;
}
port_counter = &dev->port_data[port].port_counter;
if (!qp->counter || qp->counter->id != counter_id ||
port_counter->mode.mode != RDMA_COUNTER_MODE_MANUAL) {
ret = -EINVAL;
goto out;
}
ret = rdma_counter_unbind_qp(qp, false);
out:
rdma_restrack_put(&qp->res);
return ret;
}
int rdma_counter_get_mode(struct ib_device *dev, u8 port,
enum rdma_nl_counter_mode *mode,
enum rdma_nl_counter_mask *mask)
{
struct rdma_port_counter *port_counter;
port_counter = &dev->port_data[port].port_counter;
*mode = port_counter->mode.mode;
*mask = port_counter->mode.mask;
return 0;
}
void rdma_counter_init(struct ib_device *dev)
{
struct rdma_port_counter *port_counter;
u32 port;
if (!dev->ops.alloc_hw_stats || !dev->port_data)
return;
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;
fail:
rdma_for_each_port(dev, port) {
port_counter = &dev->port_data[port].port_counter;
kfree(port_counter->hstats);
port_counter->hstats = NULL;
}
return;
}
void rdma_counter_release(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);
}
}