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RDMA/nldev: provide detailed CM_ID information
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Implement RDMA nldev netlink interface to get detailed CM_ID information.

Because cm_id's are attached to rdma devices in various work queue
contexts, the pid and task information at restrak_add() time is sometimes
not useful.  For example, an nvme/f host connection cm_id ends up being
bound to a device in a work queue context and the resulting pid at attach
time no longer exists after connection setup.  So instead we mark all
cm_id's created via the rdma_ucm as "user", and all others as "kernel".
This required tweaking the restrack code a little.  It also required
wrapping some rdma_cm functions to allow passing the module name string.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
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Steve Wise authored and Doug Ledford committed Mar 8, 2018
1 parent a3b641a commit 0031398
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Showing 8 changed files with 205 additions and 43 deletions.
61 changes: 40 additions & 21 deletions drivers/infiniband/core/cma.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -466,6 +466,8 @@ static void _cma_attach_to_dev(struct rdma_id_private *id_priv,
id_priv->id.route.addr.dev_addr.transport =
rdma_node_get_transport(cma_dev->device->node_type);
list_add_tail(&id_priv->list, &cma_dev->id_list);
id_priv->res.type = RDMA_RESTRACK_CM_ID;
rdma_restrack_add(&id_priv->res);
}

static void cma_attach_to_dev(struct rdma_id_private *id_priv,
Expand Down Expand Up @@ -738,18 +740,21 @@ static void cma_deref_id(struct rdma_id_private *id_priv)
complete(&id_priv->comp);
}

struct rdma_cm_id *rdma_create_id(struct net *net,
rdma_cm_event_handler event_handler,
void *context, enum rdma_port_space ps,
enum ib_qp_type qp_type)
struct rdma_cm_id *__rdma_create_id(struct net *net,
rdma_cm_event_handler event_handler,
void *context, enum rdma_port_space ps,
enum ib_qp_type qp_type, const char *caller)
{
struct rdma_id_private *id_priv;

id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
if (!id_priv)
return ERR_PTR(-ENOMEM);

id_priv->owner = task_pid_nr(current);
if (caller)
id_priv->res.kern_name = caller;
else
rdma_restrack_set_task(&id_priv->res, current);
id_priv->state = RDMA_CM_IDLE;
id_priv->id.context = context;
id_priv->id.event_handler = event_handler;
Expand All @@ -769,7 +774,7 @@ struct rdma_cm_id *rdma_create_id(struct net *net,

return &id_priv->id;
}
EXPORT_SYMBOL(rdma_create_id);
EXPORT_SYMBOL(__rdma_create_id);

static int cma_init_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
{
Expand Down Expand Up @@ -1629,6 +1634,7 @@ void rdma_destroy_id(struct rdma_cm_id *id)
mutex_unlock(&id_priv->handler_mutex);

if (id_priv->cma_dev) {
rdma_restrack_del(&id_priv->res);
if (rdma_cap_ib_cm(id_priv->id.device, 1)) {
if (id_priv->cm_id.ib)
ib_destroy_cm_id(id_priv->cm_id.ib);
Expand Down Expand Up @@ -1778,6 +1784,7 @@ static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
struct ib_cm_event *ib_event,
struct net_device *net_dev)
{
struct rdma_id_private *listen_id_priv;
struct rdma_id_private *id_priv;
struct rdma_cm_id *id;
struct rdma_route *rt;
Expand All @@ -1787,9 +1794,11 @@ static struct rdma_id_private *cma_new_conn_id(struct rdma_cm_id *listen_id,
ib_event->param.req_rcvd.primary_path->service_id;
int ret;

id = rdma_create_id(listen_id->route.addr.dev_addr.net,
listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
id = __rdma_create_id(listen_id->route.addr.dev_addr.net,
listen_id->event_handler, listen_id->context,
listen_id->ps, ib_event->param.req_rcvd.qp_type);
listen_id->ps, ib_event->param.req_rcvd.qp_type,
listen_id_priv->res.kern_name);
if (IS_ERR(id))
return NULL;

Expand Down Expand Up @@ -1838,14 +1847,17 @@ static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id,
struct ib_cm_event *ib_event,
struct net_device *net_dev)
{
struct rdma_id_private *listen_id_priv;
struct rdma_id_private *id_priv;
struct rdma_cm_id *id;
const sa_family_t ss_family = listen_id->route.addr.src_addr.ss_family;
struct net *net = listen_id->route.addr.dev_addr.net;
int ret;

id = rdma_create_id(net, listen_id->event_handler, listen_id->context,
listen_id->ps, IB_QPT_UD);
listen_id_priv = container_of(listen_id, struct rdma_id_private, id);
id = __rdma_create_id(net, listen_id->event_handler, listen_id->context,
listen_id->ps, IB_QPT_UD,
listen_id_priv->res.kern_name);
if (IS_ERR(id))
return NULL;

Expand Down Expand Up @@ -2111,10 +2123,11 @@ static int iw_conn_req_handler(struct iw_cm_id *cm_id,
goto out;

/* Create a new RDMA id for the new IW CM ID */
new_cm_id = rdma_create_id(listen_id->id.route.addr.dev_addr.net,
listen_id->id.event_handler,
listen_id->id.context,
RDMA_PS_TCP, IB_QPT_RC);
new_cm_id = __rdma_create_id(listen_id->id.route.addr.dev_addr.net,
listen_id->id.event_handler,
listen_id->id.context,
RDMA_PS_TCP, IB_QPT_RC,
listen_id->res.kern_name);
if (IS_ERR(new_cm_id)) {
ret = -ENOMEM;
goto out;
Expand Down Expand Up @@ -2239,8 +2252,8 @@ static void cma_listen_on_dev(struct rdma_id_private *id_priv,
if (cma_family(id_priv) == AF_IB && !rdma_cap_ib_cm(cma_dev->device, 1))
return;

id = rdma_create_id(net, cma_listen_handler, id_priv, id_priv->id.ps,
id_priv->id.qp_type);
id = __rdma_create_id(net, cma_listen_handler, id_priv, id_priv->id.ps,
id_priv->id.qp_type, id_priv->res.kern_name);
if (IS_ERR(id))
return;

Expand Down Expand Up @@ -3348,8 +3361,10 @@ int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)

return 0;
err2:
if (id_priv->cma_dev)
if (id_priv->cma_dev) {
rdma_restrack_del(&id_priv->res);
cma_release_dev(id_priv);
}
err1:
cma_comp_exch(id_priv, RDMA_CM_ADDR_BOUND, RDMA_CM_IDLE);
return ret;
Expand Down Expand Up @@ -3732,14 +3747,18 @@ static int cma_send_sidr_rep(struct rdma_id_private *id_priv,
return ib_send_cm_sidr_rep(id_priv->cm_id.ib, &rep);
}

int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
int __rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param,
const char *caller)
{
struct rdma_id_private *id_priv;
int ret;

id_priv = container_of(id, struct rdma_id_private, id);

id_priv->owner = task_pid_nr(current);
if (caller)
id_priv->res.kern_name = caller;
else
rdma_restrack_set_task(&id_priv->res, current);

if (!cma_comp(id_priv, RDMA_CM_CONNECT))
return -EINVAL;
Expand Down Expand Up @@ -3779,7 +3798,7 @@ int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
rdma_reject(id, NULL, 0);
return ret;
}
EXPORT_SYMBOL(rdma_accept);
EXPORT_SYMBOL(__rdma_accept);

int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event)
{
Expand Down Expand Up @@ -4457,7 +4476,7 @@ static int cma_get_id_stats(struct sk_buff *skb, struct netlink_callback *cb)
RDMA_NL_RDMA_CM_ATTR_DST_ADDR))
goto out;

id_stats->pid = id_priv->owner;
id_stats->pid = task_pid_vnr(id_priv->res.task);
id_stats->port_space = id->ps;
id_stats->cm_state = id_priv->state;
id_stats->qp_num = id_priv->qp_num;
Expand Down
6 changes: 5 additions & 1 deletion drivers/infiniband/core/cma_priv.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -67,13 +67,17 @@ struct rdma_id_private {
u32 seq_num;
u32 qkey;
u32 qp_num;
pid_t owner;
u32 options;
u8 srq;
u8 tos;
bool tos_set;
u8 reuseaddr;
u8 afonly;
enum ib_gid_type gid_type;

/*
* Internal to RDMA/core, don't use in the drivers
*/
struct rdma_restrack_entry res;
};
#endif /* _CMA_PRIV_H */
107 changes: 98 additions & 9 deletions drivers/infiniband/core/nldev.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -34,9 +34,11 @@
#include <linux/pid.h>
#include <linux/pid_namespace.h>
#include <net/netlink.h>
#include <rdma/rdma_cm.h>
#include <rdma/rdma_netlink.h>

#include "core_priv.h"
#include "cma_priv.h"

static const struct nla_policy nldev_policy[RDMA_NLDEV_ATTR_MAX] = {
[RDMA_NLDEV_ATTR_DEV_INDEX] = { .type = NLA_U32 },
Expand Down Expand Up @@ -71,6 +73,13 @@ static const struct nla_policy nldev_policy[RDMA_NLDEV_ATTR_MAX] = {
[RDMA_NLDEV_ATTR_RES_PID] = { .type = NLA_U32 },
[RDMA_NLDEV_ATTR_RES_KERN_NAME] = { .type = NLA_NUL_STRING,
.len = TASK_COMM_LEN },
[RDMA_NLDEV_ATTR_RES_CM_ID] = { .type = NLA_NESTED },
[RDMA_NLDEV_ATTR_RES_CM_ID_ENTRY] = { .type = NLA_NESTED },
[RDMA_NLDEV_ATTR_RES_PS] = { .type = NLA_U32 },
[RDMA_NLDEV_ATTR_RES_SRC_ADDR] = {
.len = sizeof(struct __kernel_sockaddr_storage) },
[RDMA_NLDEV_ATTR_RES_DST_ADDR] = {
.len = sizeof(struct __kernel_sockaddr_storage) },
};

static int fill_nldev_handle(struct sk_buff *msg, struct ib_device *device)
Expand Down Expand Up @@ -182,6 +191,7 @@ static int fill_res_info(struct sk_buff *msg, struct ib_device *device)
[RDMA_RESTRACK_PD] = "pd",
[RDMA_RESTRACK_CQ] = "cq",
[RDMA_RESTRACK_QP] = "qp",
[RDMA_RESTRACK_CM_ID] = "cm_id",
};

struct rdma_restrack_root *res = &device->res;
Expand Down Expand Up @@ -212,6 +222,25 @@ static int fill_res_info(struct sk_buff *msg, struct ib_device *device)
return ret;
}

static int fill_res_name_pid(struct sk_buff *msg,
struct rdma_restrack_entry *res)
{
/*
* For user resources, user is should read /proc/PID/comm to get the
* name of the task file.
*/
if (rdma_is_kernel_res(res)) {
if (nla_put_string(msg, RDMA_NLDEV_ATTR_RES_KERN_NAME,
res->kern_name))
return -EMSGSIZE;
} else {
if (nla_put_u32(msg, RDMA_NLDEV_ATTR_RES_PID,
task_pid_vnr(res->task)))
return -EMSGSIZE;
}
return 0;
}

static int fill_res_qp_entry(struct sk_buff *msg, struct netlink_callback *cb,
struct rdma_restrack_entry *res, uint32_t port)
{
Expand Down Expand Up @@ -262,19 +291,65 @@ static int fill_res_qp_entry(struct sk_buff *msg, struct netlink_callback *cb,
if (nla_put_u8(msg, RDMA_NLDEV_ATTR_RES_STATE, qp_attr.qp_state))
goto err;

/*
* Existence of task means that it is user QP and netlink
* user is invited to go and read /proc/PID/comm to get name
* of the task file and res->task_com should be NULL.
*/
if (rdma_is_kernel_res(res)) {
if (nla_put_string(msg, RDMA_NLDEV_ATTR_RES_KERN_NAME, res->kern_name))
if (fill_res_name_pid(msg, res))
goto err;

nla_nest_end(msg, entry_attr);
return 0;

err:
nla_nest_cancel(msg, entry_attr);
out:
return -EMSGSIZE;
}

static int fill_res_cm_id_entry(struct sk_buff *msg,
struct netlink_callback *cb,
struct rdma_restrack_entry *res, uint32_t port)
{
struct rdma_id_private *id_priv =
container_of(res, struct rdma_id_private, res);
struct rdma_cm_id *cm_id = &id_priv->id;
struct nlattr *entry_attr;

if (port && port != cm_id->port_num)
return 0;

entry_attr = nla_nest_start(msg, RDMA_NLDEV_ATTR_RES_CM_ID_ENTRY);
if (!entry_attr)
goto out;

if (cm_id->port_num &&
nla_put_u32(msg, RDMA_NLDEV_ATTR_PORT_INDEX, cm_id->port_num))
goto err;

if (id_priv->qp_num) {
if (nla_put_u32(msg, RDMA_NLDEV_ATTR_RES_LQPN, id_priv->qp_num))
goto err;
} else {
if (nla_put_u32(msg, RDMA_NLDEV_ATTR_RES_PID, task_pid_vnr(res->task)))
if (nla_put_u8(msg, RDMA_NLDEV_ATTR_RES_TYPE, cm_id->qp_type))
goto err;
}

if (nla_put_u32(msg, RDMA_NLDEV_ATTR_RES_PS, cm_id->ps))
goto err;

if (nla_put_u8(msg, RDMA_NLDEV_ATTR_RES_STATE, id_priv->state))
goto err;

if (cm_id->route.addr.src_addr.ss_family &&
nla_put(msg, RDMA_NLDEV_ATTR_RES_SRC_ADDR,
sizeof(cm_id->route.addr.src_addr),
&cm_id->route.addr.src_addr))
goto err;
if (cm_id->route.addr.dst_addr.ss_family &&
nla_put(msg, RDMA_NLDEV_ATTR_RES_DST_ADDR,
sizeof(cm_id->route.addr.dst_addr),
&cm_id->route.addr.dst_addr))
goto err;

if (fill_res_name_pid(msg, res))
goto err;

nla_nest_end(msg, entry_attr);
return 0;

Expand Down Expand Up @@ -571,6 +646,11 @@ static const struct nldev_fill_res_entry fill_entries[RDMA_RESTRACK_MAX] = {
.nldev_cmd = RDMA_NLDEV_CMD_RES_QP_GET,
.nldev_attr = RDMA_NLDEV_ATTR_RES_QP,
},
[RDMA_RESTRACK_CM_ID] = {
.fill_res_func = fill_res_cm_id_entry,
.nldev_cmd = RDMA_NLDEV_CMD_RES_CM_ID_GET,
.nldev_attr = RDMA_NLDEV_ATTR_RES_CM_ID,
},
};

static int res_get_common_dumpit(struct sk_buff *skb,
Expand Down Expand Up @@ -713,6 +793,12 @@ static int nldev_res_get_qp_dumpit(struct sk_buff *skb,
return res_get_common_dumpit(skb, cb, RDMA_RESTRACK_QP);
}

static int nldev_res_get_cm_id_dumpit(struct sk_buff *skb,
struct netlink_callback *cb)
{
return res_get_common_dumpit(skb, cb, RDMA_RESTRACK_CM_ID);
}

static const struct rdma_nl_cbs nldev_cb_table[RDMA_NLDEV_NUM_OPS] = {
[RDMA_NLDEV_CMD_GET] = {
.doit = nldev_get_doit,
Expand All @@ -739,6 +825,9 @@ static const struct rdma_nl_cbs nldev_cb_table[RDMA_NLDEV_NUM_OPS] = {
* too.
*/
},
[RDMA_NLDEV_CMD_RES_CM_ID_GET] = {
.dump = nldev_res_get_cm_id_dumpit,
},
};

void __init nldev_init(void)
Expand Down
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