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linux/drivers/infiniband/core/sa_query.c

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/*
* Copyright (c) 2004 Topspin Communications. All rights reserved.
* Copyright (c) 2005 Voltaire, Inc. All rights reserved.
* Copyright (c) 2006 Intel Corporation. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/random.h>
#include <linux/spinlock.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/kref.h>
#include <linux/idr.h>
#include <linux/workqueue.h>
#include <uapi/linux/if_ether.h>
#include <rdma/ib_pack.h>
#include <rdma/ib_cache.h>
#include <rdma/rdma_netlink.h>
#include <net/netlink.h>
#include <uapi/rdma/ib_user_sa.h>
#include <rdma/ib_marshall.h>
#include "sa.h"
MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("InfiniBand subnet administration query support");
MODULE_LICENSE("Dual BSD/GPL");
#define IB_SA_LOCAL_SVC_TIMEOUT_MIN 100
#define IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT 2000
#define IB_SA_LOCAL_SVC_TIMEOUT_MAX 200000
static int sa_local_svc_timeout_ms = IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT;
struct ib_sa_sm_ah {
struct ib_ah *ah;
struct kref ref;
u16 pkey_index;
u8 src_path_mask;
};
struct ib_sa_port {
struct ib_mad_agent *agent;
struct ib_sa_sm_ah *sm_ah;
struct work_struct update_task;
spinlock_t ah_lock;
u8 port_num;
};
struct ib_sa_device {
int start_port, end_port;
struct ib_event_handler event_handler;
struct ib_sa_port port[0];
};
struct ib_sa_query {
void (*callback)(struct ib_sa_query *, int, struct ib_sa_mad *);
void (*release)(struct ib_sa_query *);
struct ib_sa_client *client;
struct ib_sa_port *port;
struct ib_mad_send_buf *mad_buf;
struct ib_sa_sm_ah *sm_ah;
int id;
u32 flags;
struct list_head list; /* Local svc request list */
u32 seq; /* Local svc request sequence number */
unsigned long timeout; /* Local svc timeout */
u8 path_use; /* How will the pathrecord be used */
};
#define IB_SA_ENABLE_LOCAL_SERVICE 0x00000001
#define IB_SA_CANCEL 0x00000002
struct ib_sa_service_query {
void (*callback)(int, struct ib_sa_service_rec *, void *);
void *context;
struct ib_sa_query sa_query;
};
struct ib_sa_path_query {
void (*callback)(int, struct ib_sa_path_rec *, void *);
void *context;
struct ib_sa_query sa_query;
};
struct ib_sa_guidinfo_query {
void (*callback)(int, struct ib_sa_guidinfo_rec *, void *);
void *context;
struct ib_sa_query sa_query;
};
struct ib_sa_mcmember_query {
void (*callback)(int, struct ib_sa_mcmember_rec *, void *);
void *context;
struct ib_sa_query sa_query;
};
static LIST_HEAD(ib_nl_request_list);
static DEFINE_SPINLOCK(ib_nl_request_lock);
static atomic_t ib_nl_sa_request_seq;
static struct workqueue_struct *ib_nl_wq;
static struct delayed_work ib_nl_timed_work;
static const struct nla_policy ib_nl_policy[LS_NLA_TYPE_MAX] = {
[LS_NLA_TYPE_PATH_RECORD] = {.type = NLA_BINARY,
.len = sizeof(struct ib_path_rec_data)},
[LS_NLA_TYPE_TIMEOUT] = {.type = NLA_U32},
[LS_NLA_TYPE_SERVICE_ID] = {.type = NLA_U64},
[LS_NLA_TYPE_DGID] = {.type = NLA_BINARY,
.len = sizeof(struct rdma_nla_ls_gid)},
[LS_NLA_TYPE_SGID] = {.type = NLA_BINARY,
.len = sizeof(struct rdma_nla_ls_gid)},
[LS_NLA_TYPE_TCLASS] = {.type = NLA_U8},
[LS_NLA_TYPE_PKEY] = {.type = NLA_U16},
[LS_NLA_TYPE_QOS_CLASS] = {.type = NLA_U16},
};
static void ib_sa_add_one(struct ib_device *device);
static void ib_sa_remove_one(struct ib_device *device, void *client_data);
static struct ib_client sa_client = {
.name = "sa",
.add = ib_sa_add_one,
.remove = ib_sa_remove_one
};
static DEFINE_SPINLOCK(idr_lock);
static DEFINE_IDR(query_idr);
static DEFINE_SPINLOCK(tid_lock);
static u32 tid;
#define PATH_REC_FIELD(field) \
.struct_offset_bytes = offsetof(struct ib_sa_path_rec, field), \
.struct_size_bytes = sizeof ((struct ib_sa_path_rec *) 0)->field, \
.field_name = "sa_path_rec:" #field
static const struct ib_field path_rec_table[] = {
{ PATH_REC_FIELD(service_id),
.offset_words = 0,
.offset_bits = 0,
.size_bits = 64 },
{ PATH_REC_FIELD(dgid),
.offset_words = 2,
.offset_bits = 0,
.size_bits = 128 },
{ PATH_REC_FIELD(sgid),
.offset_words = 6,
.offset_bits = 0,
.size_bits = 128 },
{ PATH_REC_FIELD(dlid),
.offset_words = 10,
.offset_bits = 0,
.size_bits = 16 },
{ PATH_REC_FIELD(slid),
.offset_words = 10,
.offset_bits = 16,
.size_bits = 16 },
{ PATH_REC_FIELD(raw_traffic),
.offset_words = 11,
.offset_bits = 0,
.size_bits = 1 },
{ RESERVED,
.offset_words = 11,
.offset_bits = 1,
.size_bits = 3 },
{ PATH_REC_FIELD(flow_label),
.offset_words = 11,
.offset_bits = 4,
.size_bits = 20 },
{ PATH_REC_FIELD(hop_limit),
.offset_words = 11,
.offset_bits = 24,
.size_bits = 8 },
{ PATH_REC_FIELD(traffic_class),
.offset_words = 12,
.offset_bits = 0,
.size_bits = 8 },
{ PATH_REC_FIELD(reversible),
.offset_words = 12,
.offset_bits = 8,
.size_bits = 1 },
{ PATH_REC_FIELD(numb_path),
.offset_words = 12,
.offset_bits = 9,
.size_bits = 7 },
{ PATH_REC_FIELD(pkey),
.offset_words = 12,
.offset_bits = 16,
.size_bits = 16 },
{ PATH_REC_FIELD(qos_class),
.offset_words = 13,
.offset_bits = 0,
.size_bits = 12 },
{ PATH_REC_FIELD(sl),
.offset_words = 13,
.offset_bits = 12,
.size_bits = 4 },
{ PATH_REC_FIELD(mtu_selector),
.offset_words = 13,
.offset_bits = 16,
.size_bits = 2 },
{ PATH_REC_FIELD(mtu),
.offset_words = 13,
.offset_bits = 18,
.size_bits = 6 },
{ PATH_REC_FIELD(rate_selector),
.offset_words = 13,
.offset_bits = 24,
.size_bits = 2 },
{ PATH_REC_FIELD(rate),
.offset_words = 13,
.offset_bits = 26,
.size_bits = 6 },
{ PATH_REC_FIELD(packet_life_time_selector),
.offset_words = 14,
.offset_bits = 0,
.size_bits = 2 },
{ PATH_REC_FIELD(packet_life_time),
.offset_words = 14,
.offset_bits = 2,
.size_bits = 6 },
{ PATH_REC_FIELD(preference),
.offset_words = 14,
.offset_bits = 8,
.size_bits = 8 },
{ RESERVED,
.offset_words = 14,
.offset_bits = 16,
.size_bits = 48 },
};
#define MCMEMBER_REC_FIELD(field) \
.struct_offset_bytes = offsetof(struct ib_sa_mcmember_rec, field), \
.struct_size_bytes = sizeof ((struct ib_sa_mcmember_rec *) 0)->field, \
.field_name = "sa_mcmember_rec:" #field
static const struct ib_field mcmember_rec_table[] = {
{ MCMEMBER_REC_FIELD(mgid),
.offset_words = 0,
.offset_bits = 0,
.size_bits = 128 },
{ MCMEMBER_REC_FIELD(port_gid),
.offset_words = 4,
.offset_bits = 0,
.size_bits = 128 },
{ MCMEMBER_REC_FIELD(qkey),
.offset_words = 8,
.offset_bits = 0,
.size_bits = 32 },
{ MCMEMBER_REC_FIELD(mlid),
.offset_words = 9,
.offset_bits = 0,
.size_bits = 16 },
{ MCMEMBER_REC_FIELD(mtu_selector),
.offset_words = 9,
.offset_bits = 16,
.size_bits = 2 },
{ MCMEMBER_REC_FIELD(mtu),
.offset_words = 9,
.offset_bits = 18,
.size_bits = 6 },
{ MCMEMBER_REC_FIELD(traffic_class),
.offset_words = 9,
.offset_bits = 24,
.size_bits = 8 },
{ MCMEMBER_REC_FIELD(pkey),
.offset_words = 10,
.offset_bits = 0,
.size_bits = 16 },
{ MCMEMBER_REC_FIELD(rate_selector),
.offset_words = 10,
.offset_bits = 16,
.size_bits = 2 },
{ MCMEMBER_REC_FIELD(rate),
.offset_words = 10,
.offset_bits = 18,
.size_bits = 6 },
{ MCMEMBER_REC_FIELD(packet_life_time_selector),
.offset_words = 10,
.offset_bits = 24,
.size_bits = 2 },
{ MCMEMBER_REC_FIELD(packet_life_time),
.offset_words = 10,
.offset_bits = 26,
.size_bits = 6 },
{ MCMEMBER_REC_FIELD(sl),
.offset_words = 11,
.offset_bits = 0,
.size_bits = 4 },
{ MCMEMBER_REC_FIELD(flow_label),
.offset_words = 11,
.offset_bits = 4,
.size_bits = 20 },
{ MCMEMBER_REC_FIELD(hop_limit),
.offset_words = 11,
.offset_bits = 24,
.size_bits = 8 },
{ MCMEMBER_REC_FIELD(scope),
.offset_words = 12,
.offset_bits = 0,
.size_bits = 4 },
{ MCMEMBER_REC_FIELD(join_state),
.offset_words = 12,
.offset_bits = 4,
.size_bits = 4 },
{ MCMEMBER_REC_FIELD(proxy_join),
.offset_words = 12,
.offset_bits = 8,
.size_bits = 1 },
{ RESERVED,
.offset_words = 12,
.offset_bits = 9,
.size_bits = 23 },
};
#define SERVICE_REC_FIELD(field) \
.struct_offset_bytes = offsetof(struct ib_sa_service_rec, field), \
.struct_size_bytes = sizeof ((struct ib_sa_service_rec *) 0)->field, \
.field_name = "sa_service_rec:" #field
static const struct ib_field service_rec_table[] = {
{ SERVICE_REC_FIELD(id),
.offset_words = 0,
.offset_bits = 0,
.size_bits = 64 },
{ SERVICE_REC_FIELD(gid),
.offset_words = 2,
.offset_bits = 0,
.size_bits = 128 },
{ SERVICE_REC_FIELD(pkey),
.offset_words = 6,
.offset_bits = 0,
.size_bits = 16 },
{ SERVICE_REC_FIELD(lease),
.offset_words = 7,
.offset_bits = 0,
.size_bits = 32 },
{ SERVICE_REC_FIELD(key),
.offset_words = 8,
.offset_bits = 0,
.size_bits = 128 },
{ SERVICE_REC_FIELD(name),
.offset_words = 12,
.offset_bits = 0,
.size_bits = 64*8 },
{ SERVICE_REC_FIELD(data8),
.offset_words = 28,
.offset_bits = 0,
.size_bits = 16*8 },
{ SERVICE_REC_FIELD(data16),
.offset_words = 32,
.offset_bits = 0,
.size_bits = 8*16 },
{ SERVICE_REC_FIELD(data32),
.offset_words = 36,
.offset_bits = 0,
.size_bits = 4*32 },
{ SERVICE_REC_FIELD(data64),
.offset_words = 40,
.offset_bits = 0,
.size_bits = 2*64 },
};
#define GUIDINFO_REC_FIELD(field) \
.struct_offset_bytes = offsetof(struct ib_sa_guidinfo_rec, field), \
.struct_size_bytes = sizeof((struct ib_sa_guidinfo_rec *) 0)->field, \
.field_name = "sa_guidinfo_rec:" #field
static const struct ib_field guidinfo_rec_table[] = {
{ GUIDINFO_REC_FIELD(lid),
.offset_words = 0,
.offset_bits = 0,
.size_bits = 16 },
{ GUIDINFO_REC_FIELD(block_num),
.offset_words = 0,
.offset_bits = 16,
.size_bits = 8 },
{ GUIDINFO_REC_FIELD(res1),
.offset_words = 0,
.offset_bits = 24,
.size_bits = 8 },
{ GUIDINFO_REC_FIELD(res2),
.offset_words = 1,
.offset_bits = 0,
.size_bits = 32 },
{ GUIDINFO_REC_FIELD(guid_info_list),
.offset_words = 2,
.offset_bits = 0,
.size_bits = 512 },
};
static inline void ib_sa_disable_local_svc(struct ib_sa_query *query)
{
query->flags &= ~IB_SA_ENABLE_LOCAL_SERVICE;
}
static inline int ib_sa_query_cancelled(struct ib_sa_query *query)
{
return (query->flags & IB_SA_CANCEL);
}
static void ib_nl_set_path_rec_attrs(struct sk_buff *skb,
struct ib_sa_query *query)
{
struct ib_sa_path_rec *sa_rec = query->mad_buf->context[1];
struct ib_sa_mad *mad = query->mad_buf->mad;
ib_sa_comp_mask comp_mask = mad->sa_hdr.comp_mask;
u16 val16;
u64 val64;
struct rdma_ls_resolve_header *header;
query->mad_buf->context[1] = NULL;
/* Construct the family header first */
header = (struct rdma_ls_resolve_header *)
skb_put(skb, NLMSG_ALIGN(sizeof(*header)));
memcpy(header->device_name, query->port->agent->device->name,
LS_DEVICE_NAME_MAX);
header->port_num = query->port->port_num;
if ((comp_mask & IB_SA_PATH_REC_REVERSIBLE) &&
sa_rec->reversible != 0)
query->path_use = LS_RESOLVE_PATH_USE_GMP;
else
query->path_use = LS_RESOLVE_PATH_USE_UNIDIRECTIONAL;
header->path_use = query->path_use;
/* Now build the attributes */
if (comp_mask & IB_SA_PATH_REC_SERVICE_ID) {
val64 = be64_to_cpu(sa_rec->service_id);
nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SERVICE_ID,
sizeof(val64), &val64);
}
if (comp_mask & IB_SA_PATH_REC_DGID)
nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_DGID,
sizeof(sa_rec->dgid), &sa_rec->dgid);
if (comp_mask & IB_SA_PATH_REC_SGID)
nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SGID,
sizeof(sa_rec->sgid), &sa_rec->sgid);
if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS)
nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_TCLASS,
sizeof(sa_rec->traffic_class), &sa_rec->traffic_class);
if (comp_mask & IB_SA_PATH_REC_PKEY) {
val16 = be16_to_cpu(sa_rec->pkey);
nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_PKEY,
sizeof(val16), &val16);
}
if (comp_mask & IB_SA_PATH_REC_QOS_CLASS) {
val16 = be16_to_cpu(sa_rec->qos_class);
nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_QOS_CLASS,
sizeof(val16), &val16);
}
}
static int ib_nl_get_path_rec_attrs_len(ib_sa_comp_mask comp_mask)
{
int len = 0;
if (comp_mask & IB_SA_PATH_REC_SERVICE_ID)
len += nla_total_size(sizeof(u64));
if (comp_mask & IB_SA_PATH_REC_DGID)
len += nla_total_size(sizeof(struct rdma_nla_ls_gid));
if (comp_mask & IB_SA_PATH_REC_SGID)
len += nla_total_size(sizeof(struct rdma_nla_ls_gid));
if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS)
len += nla_total_size(sizeof(u8));
if (comp_mask & IB_SA_PATH_REC_PKEY)
len += nla_total_size(sizeof(u16));
if (comp_mask & IB_SA_PATH_REC_QOS_CLASS)
len += nla_total_size(sizeof(u16));
/*
* Make sure that at least some of the required comp_mask bits are
* set.
*/
if (WARN_ON(len == 0))
return len;
/* Add the family header */
len += NLMSG_ALIGN(sizeof(struct rdma_ls_resolve_header));
return len;
}
static int ib_nl_send_msg(struct ib_sa_query *query)
{
struct sk_buff *skb = NULL;
struct nlmsghdr *nlh;
void *data;
int ret = 0;
struct ib_sa_mad *mad;
int len;
mad = query->mad_buf->mad;
len = ib_nl_get_path_rec_attrs_len(mad->sa_hdr.comp_mask);
if (len <= 0)
return -EMSGSIZE;
skb = nlmsg_new(len, GFP_KERNEL);
if (!skb)
return -ENOMEM;
/* Put nlmsg header only for now */
data = ibnl_put_msg(skb, &nlh, query->seq, 0, RDMA_NL_LS,
RDMA_NL_LS_OP_RESOLVE, NLM_F_REQUEST);
if (!data) {
kfree_skb(skb);
return -EMSGSIZE;
}
/* Add attributes */
ib_nl_set_path_rec_attrs(skb, query);
/* Repair the nlmsg header length */
nlmsg_end(skb, nlh);
ret = ibnl_multicast(skb, nlh, RDMA_NL_GROUP_LS, GFP_KERNEL);
if (!ret)
ret = len;
else
ret = 0;
return ret;
}
static int ib_nl_make_request(struct ib_sa_query *query)
{
unsigned long flags;
unsigned long delay;
int ret;
INIT_LIST_HEAD(&query->list);
query->seq = (u32)atomic_inc_return(&ib_nl_sa_request_seq);
spin_lock_irqsave(&ib_nl_request_lock, flags);
ret = ib_nl_send_msg(query);
if (ret <= 0) {
ret = -EIO;
goto request_out;
} else {
ret = 0;
}
delay = msecs_to_jiffies(sa_local_svc_timeout_ms);
query->timeout = delay + jiffies;
list_add_tail(&query->list, &ib_nl_request_list);
/* Start the timeout if this is the only request */
if (ib_nl_request_list.next == &query->list)
queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay);
request_out:
spin_unlock_irqrestore(&ib_nl_request_lock, flags);
return ret;
}
static int ib_nl_cancel_request(struct ib_sa_query *query)
{
unsigned long flags;
struct ib_sa_query *wait_query;
int found = 0;
spin_lock_irqsave(&ib_nl_request_lock, flags);
list_for_each_entry(wait_query, &ib_nl_request_list, list) {
/* Let the timeout to take care of the callback */
if (query == wait_query) {
query->flags |= IB_SA_CANCEL;
query->timeout = jiffies;
list_move(&query->list, &ib_nl_request_list);
found = 1;
mod_delayed_work(ib_nl_wq, &ib_nl_timed_work, 1);
break;
}
}
spin_unlock_irqrestore(&ib_nl_request_lock, flags);
return found;
}
static void send_handler(struct ib_mad_agent *agent,
struct ib_mad_send_wc *mad_send_wc);
static void ib_nl_process_good_resolve_rsp(struct ib_sa_query *query,
const struct nlmsghdr *nlh)
{
struct ib_mad_send_wc mad_send_wc;
struct ib_sa_mad *mad = NULL;
const struct nlattr *head, *curr;
struct ib_path_rec_data *rec;
int len, rem;
u32 mask = 0;
int status = -EIO;
if (query->callback) {
head = (const struct nlattr *) nlmsg_data(nlh);
len = nlmsg_len(nlh);
switch (query->path_use) {
case LS_RESOLVE_PATH_USE_UNIDIRECTIONAL:
mask = IB_PATH_PRIMARY | IB_PATH_OUTBOUND;
break;
case LS_RESOLVE_PATH_USE_ALL:
case LS_RESOLVE_PATH_USE_GMP:
default:
mask = IB_PATH_PRIMARY | IB_PATH_GMP |
IB_PATH_BIDIRECTIONAL;
break;
}
nla_for_each_attr(curr, head, len, rem) {
if (curr->nla_type == LS_NLA_TYPE_PATH_RECORD) {
rec = nla_data(curr);
/*
* Get the first one. In the future, we may
* need to get up to 6 pathrecords.
*/
if ((rec->flags & mask) == mask) {
mad = query->mad_buf->mad;
mad->mad_hdr.method |=
IB_MGMT_METHOD_RESP;
memcpy(mad->data, rec->path_rec,
sizeof(rec->path_rec));
status = 0;
break;
}
}
}
query->callback(query, status, mad);
}
mad_send_wc.send_buf = query->mad_buf;
mad_send_wc.status = IB_WC_SUCCESS;
send_handler(query->mad_buf->mad_agent, &mad_send_wc);
}
static void ib_nl_request_timeout(struct work_struct *work)
{
unsigned long flags;
struct ib_sa_query *query;
unsigned long delay;
struct ib_mad_send_wc mad_send_wc;
int ret;
spin_lock_irqsave(&ib_nl_request_lock, flags);
while (!list_empty(&ib_nl_request_list)) {
query = list_entry(ib_nl_request_list.next,
struct ib_sa_query, list);
if (time_after(query->timeout, jiffies)) {
delay = query->timeout - jiffies;
if ((long)delay <= 0)
delay = 1;
queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay);
break;
}
list_del(&query->list);
ib_sa_disable_local_svc(query);
/* Hold the lock to protect against query cancellation */
if (ib_sa_query_cancelled(query))
ret = -1;
else
ret = ib_post_send_mad(query->mad_buf, NULL);
if (ret) {
mad_send_wc.send_buf = query->mad_buf;
mad_send_wc.status = IB_WC_WR_FLUSH_ERR;
spin_unlock_irqrestore(&ib_nl_request_lock, flags);
send_handler(query->port->agent, &mad_send_wc);
spin_lock_irqsave(&ib_nl_request_lock, flags);
}
}
spin_unlock_irqrestore(&ib_nl_request_lock, flags);
}
static int ib_nl_handle_set_timeout(struct sk_buff *skb,
struct netlink_callback *cb)
{
const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh;
int timeout, delta, abs_delta;
const struct nlattr *attr;
unsigned long flags;
struct ib_sa_query *query;
long delay = 0;
struct nlattr *tb[LS_NLA_TYPE_MAX];
int ret;
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
nlmsg_len(nlh), ib_nl_policy);
attr = (const struct nlattr *)tb[LS_NLA_TYPE_TIMEOUT];
if (ret || !attr)
goto settimeout_out;
timeout = *(int *) nla_data(attr);
if (timeout < IB_SA_LOCAL_SVC_TIMEOUT_MIN)
timeout = IB_SA_LOCAL_SVC_TIMEOUT_MIN;
if (timeout > IB_SA_LOCAL_SVC_TIMEOUT_MAX)
timeout = IB_SA_LOCAL_SVC_TIMEOUT_MAX;
delta = timeout - sa_local_svc_timeout_ms;
if (delta < 0)
abs_delta = -delta;
else
abs_delta = delta;
if (delta != 0) {
spin_lock_irqsave(&ib_nl_request_lock, flags);
sa_local_svc_timeout_ms = timeout;
list_for_each_entry(query, &ib_nl_request_list, list) {
if (delta < 0 && abs_delta > query->timeout)
query->timeout = 0;
else
query->timeout += delta;
/* Get the new delay from the first entry */
if (!delay) {
delay = query->timeout - jiffies;
if (delay <= 0)
delay = 1;
}
}
if (delay)
mod_delayed_work(ib_nl_wq, &ib_nl_timed_work,
(unsigned long)delay);
spin_unlock_irqrestore(&ib_nl_request_lock, flags);
}
settimeout_out:
return skb->len;
}
static inline int ib_nl_is_good_resolve_resp(const struct nlmsghdr *nlh)
{
struct nlattr *tb[LS_NLA_TYPE_MAX];
int ret;
if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR)
return 0;
ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh),
nlmsg_len(nlh), ib_nl_policy);
if (ret)
return 0;
return 1;
}
static int ib_nl_handle_resolve_resp(struct sk_buff *skb,
struct netlink_callback *cb)
{
const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh;
unsigned long flags;
struct ib_sa_query *query;
struct ib_mad_send_buf *send_buf;
struct ib_mad_send_wc mad_send_wc;
int found = 0;
int ret;
if (!netlink_capable(skb, CAP_NET_ADMIN))
return -EPERM;
spin_lock_irqsave(&ib_nl_request_lock, flags);
list_for_each_entry(query, &ib_nl_request_list, list) {
/*
* If the query is cancelled, let the timeout routine
* take care of it.
*/
if (nlh->nlmsg_seq == query->seq) {
found = !ib_sa_query_cancelled(query);
if (found)
list_del(&query->list);
break;
}
}
if (!found) {
spin_unlock_irqrestore(&ib_nl_request_lock, flags);
goto resp_out;
}
send_buf = query->mad_buf;
if (!ib_nl_is_good_resolve_resp(nlh)) {
/* if the result is a failure, send out the packet via IB */
ib_sa_disable_local_svc(query);
ret = ib_post_send_mad(query->mad_buf, NULL);
spin_unlock_irqrestore(&ib_nl_request_lock, flags);
if (ret) {
mad_send_wc.send_buf = send_buf;
mad_send_wc.status = IB_WC_GENERAL_ERR;
send_handler(query->port->agent, &mad_send_wc);
}
} else {
spin_unlock_irqrestore(&ib_nl_request_lock, flags);
ib_nl_process_good_resolve_rsp(query, nlh);
}
resp_out:
return skb->len;
}
static struct ibnl_client_cbs ib_sa_cb_table[] = {
[RDMA_NL_LS_OP_RESOLVE] = {
.dump = ib_nl_handle_resolve_resp,
.module = THIS_MODULE },
[RDMA_NL_LS_OP_SET_TIMEOUT] = {
.dump = ib_nl_handle_set_timeout,
.module = THIS_MODULE },
};
static void free_sm_ah(struct kref *kref)
{
struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref);
ib_destroy_ah(sm_ah->ah);
kfree(sm_ah);
}
static void update_sm_ah(struct work_struct *work)
{
struct ib_sa_port *port =
container_of(work, struct ib_sa_port, update_task);
struct ib_sa_sm_ah *new_ah;
struct ib_port_attr port_attr;
struct ib_ah_attr ah_attr;
if (ib_query_port(port->agent->device, port->port_num, &port_attr)) {
printk(KERN_WARNING "Couldn't query port\n");
return;
}
new_ah = kmalloc(sizeof *new_ah, GFP_KERNEL);
if (!new_ah) {
printk(KERN_WARNING "Couldn't allocate new SM AH\n");
return;
}
kref_init(&new_ah->ref);
new_ah->src_path_mask = (1 << port_attr.lmc) - 1;
new_ah->pkey_index = 0;
if (ib_find_pkey(port->agent->device, port->port_num,
IB_DEFAULT_PKEY_FULL, &new_ah->pkey_index))
printk(KERN_ERR "Couldn't find index for default PKey\n");
memset(&ah_attr, 0, sizeof ah_attr);
ah_attr.dlid = port_attr.sm_lid;
ah_attr.sl = port_attr.sm_sl;
ah_attr.port_num = port->port_num;
new_ah->ah = ib_create_ah(port->agent->qp->pd, &ah_attr);
if (IS_ERR(new_ah->ah)) {
printk(KERN_WARNING "Couldn't create new SM AH\n");
kfree(new_ah);
return;
}
spin_lock_irq(&port->ah_lock);
if (port->sm_ah)
kref_put(&port->sm_ah->ref, free_sm_ah);
port->sm_ah = new_ah;
spin_unlock_irq(&port->ah_lock);
}
static void ib_sa_event(struct ib_event_handler *handler, struct ib_event *event)
{
if (event->event == IB_EVENT_PORT_ERR ||
event->event == IB_EVENT_PORT_ACTIVE ||
event->event == IB_EVENT_LID_CHANGE ||
event->event == IB_EVENT_PKEY_CHANGE ||
event->event == IB_EVENT_SM_CHANGE ||
event->event == IB_EVENT_CLIENT_REREGISTER) {
unsigned long flags;
struct ib_sa_device *sa_dev =
container_of(handler, typeof(*sa_dev), event_handler);
struct ib_sa_port *port =
&sa_dev->port[event->element.port_num - sa_dev->start_port];
if (!rdma_cap_ib_sa(handler->device, port->port_num))
return;
spin_lock_irqsave(&port->ah_lock, flags);
if (port->sm_ah)
kref_put(&port->sm_ah->ref, free_sm_ah);
port->sm_ah = NULL;
spin_unlock_irqrestore(&port->ah_lock, flags);
queue_work(ib_wq, &sa_dev->port[event->element.port_num -
sa_dev->start_port].update_task);
}
}
void ib_sa_register_client(struct ib_sa_client *client)
{
atomic_set(&client->users, 1);
init_completion(&client->comp);
}
EXPORT_SYMBOL(ib_sa_register_client);
void ib_sa_unregister_client(struct ib_sa_client *client)
{
ib_sa_client_put(client);
wait_for_completion(&client->comp);
}
EXPORT_SYMBOL(ib_sa_unregister_client);
/**
* ib_sa_cancel_query - try to cancel an SA query
* @id:ID of query to cancel
* @query:query pointer to cancel
*
* Try to cancel an SA query. If the id and query don't match up or
* the query has already completed, nothing is done. Otherwise the
* query is canceled and will complete with a status of -EINTR.
*/
void ib_sa_cancel_query(int id, struct ib_sa_query *query)
{
unsigned long flags;
struct ib_mad_agent *agent;
struct ib_mad_send_buf *mad_buf;
spin_lock_irqsave(&idr_lock, flags);
if (idr_find(&query_idr, id) != query) {
spin_unlock_irqrestore(&idr_lock, flags);
return;
}
agent = query->port->agent;
mad_buf = query->mad_buf;
spin_unlock_irqrestore(&idr_lock, flags);
/*
* If the query is still on the netlink request list, schedule
* it to be cancelled by the timeout routine. Otherwise, it has been
* sent to the MAD layer and has to be cancelled from there.
*/
if (!ib_nl_cancel_request(query))
ib_cancel_mad(agent, mad_buf);
}
EXPORT_SYMBOL(ib_sa_cancel_query);
static u8 get_src_path_mask(struct ib_device *device, u8 port_num)
{
struct ib_sa_device *sa_dev;
struct ib_sa_port *port;
unsigned long flags;
u8 src_path_mask;
sa_dev = ib_get_client_data(device, &sa_client);
if (!sa_dev)
return 0x7f;
port = &sa_dev->port[port_num - sa_dev->start_port];
spin_lock_irqsave(&port->ah_lock, flags);
src_path_mask = port->sm_ah ? port->sm_ah->src_path_mask : 0x7f;
spin_unlock_irqrestore(&port->ah_lock, flags);
return src_path_mask;
}
int ib_init_ah_from_path(struct ib_device *device, u8 port_num,
struct ib_sa_path_rec *rec, struct ib_ah_attr *ah_attr)
{
int ret;
u16 gid_index;
int force_grh;
memset(ah_attr, 0, sizeof *ah_attr);
ah_attr->dlid = be16_to_cpu(rec->dlid);
ah_attr->sl = rec->sl;
ah_attr->src_path_bits = be16_to_cpu(rec->slid) &
get_src_path_mask(device, port_num);
ah_attr->port_num = port_num;
ah_attr->static_rate = rec->rate;
force_grh = rdma_cap_eth_ah(device, port_num);
if (rec->hop_limit > 1 || force_grh) {
struct net_device *ndev = ib_get_ndev_from_path(rec);
ah_attr->ah_flags = IB_AH_GRH;
ah_attr->grh.dgid = rec->dgid;
ret = ib_find_cached_gid(device, &rec->sgid, ndev, &port_num,
&gid_index);
if (ret) {
if (ndev)
dev_put(ndev);
return ret;
}
ah_attr->grh.sgid_index = gid_index;
ah_attr->grh.flow_label = be32_to_cpu(rec->flow_label);
ah_attr->grh.hop_limit = rec->hop_limit;
ah_attr->grh.traffic_class = rec->traffic_class;
if (ndev)
dev_put(ndev);
}
if (force_grh) {
memcpy(ah_attr->dmac, rec->dmac, ETH_ALEN);
}
return 0;
}
EXPORT_SYMBOL(ib_init_ah_from_path);
static int alloc_mad(struct ib_sa_query *query, gfp_t gfp_mask)
{
unsigned long flags;
spin_lock_irqsave(&query->port->ah_lock, flags);
if (!query->port->sm_ah) {
spin_unlock_irqrestore(&query->port->ah_lock, flags);
return -EAGAIN;
}
kref_get(&query->port->sm_ah->ref);
query->sm_ah = query->port->sm_ah;
spin_unlock_irqrestore(&query->port->ah_lock, flags);
query->mad_buf = ib_create_send_mad(query->port->agent, 1,
query->sm_ah->pkey_index,
0, IB_MGMT_SA_HDR, IB_MGMT_SA_DATA,
gfp_mask,
IB_MGMT_BASE_VERSION);
if (IS_ERR(query->mad_buf)) {
kref_put(&query->sm_ah->ref, free_sm_ah);
return -ENOMEM;
}
query->mad_buf->ah = query->sm_ah->ah;
return 0;
}
static void free_mad(struct ib_sa_query *query)
{
ib_free_send_mad(query->mad_buf);
kref_put(&query->sm_ah->ref, free_sm_ah);
}
static void init_mad(struct ib_sa_mad *mad, struct ib_mad_agent *agent)
{
unsigned long flags;
memset(mad, 0, sizeof *mad);
mad->mad_hdr.base_version = IB_MGMT_BASE_VERSION;
mad->mad_hdr.mgmt_class = IB_MGMT_CLASS_SUBN_ADM;
mad->mad_hdr.class_version = IB_SA_CLASS_VERSION;
spin_lock_irqsave(&tid_lock, flags);
mad->mad_hdr.tid =
cpu_to_be64(((u64) agent->hi_tid) << 32 | tid++);
spin_unlock_irqrestore(&tid_lock, flags);
}
static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask)
{
bool preload = gfpflags_allow_blocking(gfp_mask);
unsigned long flags;
int ret, id;
if (preload)
idr_preload(gfp_mask);
spin_lock_irqsave(&idr_lock, flags);
id = idr_alloc(&query_idr, query, 0, 0, GFP_NOWAIT);
spin_unlock_irqrestore(&idr_lock, flags);
if (preload)
idr_preload_end();
if (id < 0)
return id;
query->mad_buf->timeout_ms = timeout_ms;
query->mad_buf->context[0] = query;
query->id = id;
if (query->flags & IB_SA_ENABLE_LOCAL_SERVICE) {
if (!ibnl_chk_listeners(RDMA_NL_GROUP_LS)) {
if (!ib_nl_make_request(query))
return id;
}
ib_sa_disable_local_svc(query);
}
ret = ib_post_send_mad(query->mad_buf, NULL);
if (ret) {
spin_lock_irqsave(&idr_lock, flags);
idr_remove(&query_idr, id);
spin_unlock_irqrestore(&idr_lock, flags);
}
/*
* It's not safe to dereference query any more, because the
* send may already have completed and freed the query in
* another context.
*/
return ret ? ret : id;
}
void ib_sa_unpack_path(void *attribute, struct ib_sa_path_rec *rec)
{
ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table), attribute, rec);
}
EXPORT_SYMBOL(ib_sa_unpack_path);
void ib_sa_pack_path(struct ib_sa_path_rec *rec, void *attribute)
{
ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, attribute);
}
EXPORT_SYMBOL(ib_sa_pack_path);
static void ib_sa_path_rec_callback(struct ib_sa_query *sa_query,
int status,
struct ib_sa_mad *mad)
{
struct ib_sa_path_query *query =
container_of(sa_query, struct ib_sa_path_query, sa_query);
if (mad) {
struct ib_sa_path_rec rec;
ib_unpack(path_rec_table, ARRAY_SIZE(path_rec_table),
mad->data, &rec);
rec.net = NULL;
rec.ifindex = 0;
memset(rec.dmac, 0, ETH_ALEN);
query->callback(status, &rec, query->context);
} else
query->callback(status, NULL, query->context);
}
static void ib_sa_path_rec_release(struct ib_sa_query *sa_query)
{
kfree(container_of(sa_query, struct ib_sa_path_query, sa_query));
}
/**
* ib_sa_path_rec_get - Start a Path get query
* @client:SA client
* @device:device to send query on
* @port_num: port number to send query on
* @rec:Path Record to send in query
* @comp_mask:component mask to send in query
* @timeout_ms:time to wait for response
* @gfp_mask:GFP mask to use for internal allocations
* @callback:function called when query completes, times out or is
* canceled
* @context:opaque user context passed to callback
* @sa_query:query context, used to cancel query
*
* Send a Path Record Get query to the SA to look up a path. The
* callback function will be called when the query completes (or
* fails); status is 0 for a successful response, -EINTR if the query
* is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
* occurred sending the query. The resp parameter of the callback is
* only valid if status is 0.
*
* If the return value of ib_sa_path_rec_get() is negative, it is an
* error code. Otherwise it is a query ID that can be used to cancel
* the query.
*/
int ib_sa_path_rec_get(struct ib_sa_client *client,
struct ib_device *device, u8 port_num,
struct ib_sa_path_rec *rec,
ib_sa_comp_mask comp_mask,
int timeout_ms, gfp_t gfp_mask,
void (*callback)(int status,
struct ib_sa_path_rec *resp,
void *context),
void *context,
struct ib_sa_query **sa_query)
{
struct ib_sa_path_query *query;
struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
struct ib_sa_port *port;
struct ib_mad_agent *agent;
struct ib_sa_mad *mad;
int ret;
if (!sa_dev)
return -ENODEV;
port = &sa_dev->port[port_num - sa_dev->start_port];
agent = port->agent;
query = kzalloc(sizeof(*query), gfp_mask);
if (!query)
return -ENOMEM;
query->sa_query.port = port;
ret = alloc_mad(&query->sa_query, gfp_mask);
if (ret)
goto err1;
ib_sa_client_get(client);
query->sa_query.client = client;
query->callback = callback;
query->context = context;
mad = query->sa_query.mad_buf->mad;
init_mad(mad, agent);
query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
query->sa_query.release = ib_sa_path_rec_release;
mad->mad_hdr.method = IB_MGMT_METHOD_GET;
mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_PATH_REC);
mad->sa_hdr.comp_mask = comp_mask;
ib_pack(path_rec_table, ARRAY_SIZE(path_rec_table), rec, mad->data);
*sa_query = &query->sa_query;
query->sa_query.flags |= IB_SA_ENABLE_LOCAL_SERVICE;
query->sa_query.mad_buf->context[1] = rec;
ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
if (ret < 0)
goto err2;
return ret;
err2:
*sa_query = NULL;
ib_sa_client_put(query->sa_query.client);
free_mad(&query->sa_query);
err1:
kfree(query);
return ret;
}
EXPORT_SYMBOL(ib_sa_path_rec_get);
static void ib_sa_service_rec_callback(struct ib_sa_query *sa_query,
int status,
struct ib_sa_mad *mad)
{
struct ib_sa_service_query *query =
container_of(sa_query, struct ib_sa_service_query, sa_query);
if (mad) {
struct ib_sa_service_rec rec;
ib_unpack(service_rec_table, ARRAY_SIZE(service_rec_table),
mad->data, &rec);
query->callback(status, &rec, query->context);
} else
query->callback(status, NULL, query->context);
}
static void ib_sa_service_rec_release(struct ib_sa_query *sa_query)
{
kfree(container_of(sa_query, struct ib_sa_service_query, sa_query));
}
/**
* ib_sa_service_rec_query - Start Service Record operation
* @client:SA client
* @device:device to send request on
* @port_num: port number to send request on
* @method:SA method - should be get, set, or delete
* @rec:Service Record to send in request
* @comp_mask:component mask to send in request
* @timeout_ms:time to wait for response
* @gfp_mask:GFP mask to use for internal allocations
* @callback:function called when request completes, times out or is
* canceled
* @context:opaque user context passed to callback
* @sa_query:request context, used to cancel request
*
* Send a Service Record set/get/delete to the SA to register,
* unregister or query a service record.
* The callback function will be called when the request completes (or
* fails); status is 0 for a successful response, -EINTR if the query
* is canceled, -ETIMEDOUT is the query timed out, or -EIO if an error
* occurred sending the query. The resp parameter of the callback is
* only valid if status is 0.
*
* If the return value of ib_sa_service_rec_query() is negative, it is an
* error code. Otherwise it is a request ID that can be used to cancel
* the query.
*/
int ib_sa_service_rec_query(struct ib_sa_client *client,
struct ib_device *device, u8 port_num, u8 method,
struct ib_sa_service_rec *rec,
ib_sa_comp_mask comp_mask,
int timeout_ms, gfp_t gfp_mask,
void (*callback)(int status,
struct ib_sa_service_rec *resp,
void *context),
void *context,
struct ib_sa_query **sa_query)
{
struct ib_sa_service_query *query;
struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
struct ib_sa_port *port;
struct ib_mad_agent *agent;
struct ib_sa_mad *mad;
int ret;
if (!sa_dev)
return -ENODEV;
port = &sa_dev->port[port_num - sa_dev->start_port];
agent = port->agent;
if (method != IB_MGMT_METHOD_GET &&
method != IB_MGMT_METHOD_SET &&
method != IB_SA_METHOD_DELETE)
return -EINVAL;
query = kzalloc(sizeof(*query), gfp_mask);
if (!query)
return -ENOMEM;
query->sa_query.port = port;
ret = alloc_mad(&query->sa_query, gfp_mask);
if (ret)
goto err1;
ib_sa_client_get(client);
query->sa_query.client = client;
query->callback = callback;
query->context = context;
mad = query->sa_query.mad_buf->mad;
init_mad(mad, agent);
query->sa_query.callback = callback ? ib_sa_service_rec_callback : NULL;
query->sa_query.release = ib_sa_service_rec_release;
mad->mad_hdr.method = method;
mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_SERVICE_REC);
mad->sa_hdr.comp_mask = comp_mask;
ib_pack(service_rec_table, ARRAY_SIZE(service_rec_table),
rec, mad->data);
*sa_query = &query->sa_query;
ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
if (ret < 0)
goto err2;
return ret;
err2:
*sa_query = NULL;
ib_sa_client_put(query->sa_query.client);
free_mad(&query->sa_query);
err1:
kfree(query);
return ret;
}
EXPORT_SYMBOL(ib_sa_service_rec_query);
static void ib_sa_mcmember_rec_callback(struct ib_sa_query *sa_query,
int status,
struct ib_sa_mad *mad)
{
struct ib_sa_mcmember_query *query =
container_of(sa_query, struct ib_sa_mcmember_query, sa_query);
if (mad) {
struct ib_sa_mcmember_rec rec;
ib_unpack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
mad->data, &rec);
query->callback(status, &rec, query->context);
} else
query->callback(status, NULL, query->context);
}
static void ib_sa_mcmember_rec_release(struct ib_sa_query *sa_query)
{
kfree(container_of(sa_query, struct ib_sa_mcmember_query, sa_query));
}
int ib_sa_mcmember_rec_query(struct ib_sa_client *client,
struct ib_device *device, u8 port_num,
u8 method,
struct ib_sa_mcmember_rec *rec,
ib_sa_comp_mask comp_mask,
int timeout_ms, gfp_t gfp_mask,
void (*callback)(int status,
struct ib_sa_mcmember_rec *resp,
void *context),
void *context,
struct ib_sa_query **sa_query)
{
struct ib_sa_mcmember_query *query;
struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
struct ib_sa_port *port;
struct ib_mad_agent *agent;
struct ib_sa_mad *mad;
int ret;
if (!sa_dev)
return -ENODEV;
port = &sa_dev->port[port_num - sa_dev->start_port];
agent = port->agent;
query = kzalloc(sizeof(*query), gfp_mask);
if (!query)
return -ENOMEM;
query->sa_query.port = port;
ret = alloc_mad(&query->sa_query, gfp_mask);
if (ret)
goto err1;
ib_sa_client_get(client);
query->sa_query.client = client;
query->callback = callback;
query->context = context;
mad = query->sa_query.mad_buf->mad;
init_mad(mad, agent);
query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
query->sa_query.release = ib_sa_mcmember_rec_release;
mad->mad_hdr.method = method;
mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_MC_MEMBER_REC);
mad->sa_hdr.comp_mask = comp_mask;
ib_pack(mcmember_rec_table, ARRAY_SIZE(mcmember_rec_table),
rec, mad->data);
*sa_query = &query->sa_query;
ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
if (ret < 0)
goto err2;
return ret;
err2:
*sa_query = NULL;
ib_sa_client_put(query->sa_query.client);
free_mad(&query->sa_query);
err1:
kfree(query);
return ret;
}
/* Support GuidInfoRecord */
static void ib_sa_guidinfo_rec_callback(struct ib_sa_query *sa_query,
int status,
struct ib_sa_mad *mad)
{
struct ib_sa_guidinfo_query *query =
container_of(sa_query, struct ib_sa_guidinfo_query, sa_query);
if (mad) {
struct ib_sa_guidinfo_rec rec;
ib_unpack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table),
mad->data, &rec);
query->callback(status, &rec, query->context);
} else
query->callback(status, NULL, query->context);
}
static void ib_sa_guidinfo_rec_release(struct ib_sa_query *sa_query)
{
kfree(container_of(sa_query, struct ib_sa_guidinfo_query, sa_query));
}
int ib_sa_guid_info_rec_query(struct ib_sa_client *client,
struct ib_device *device, u8 port_num,
struct ib_sa_guidinfo_rec *rec,
ib_sa_comp_mask comp_mask, u8 method,
int timeout_ms, gfp_t gfp_mask,
void (*callback)(int status,
struct ib_sa_guidinfo_rec *resp,
void *context),
void *context,
struct ib_sa_query **sa_query)
{
struct ib_sa_guidinfo_query *query;
struct ib_sa_device *sa_dev = ib_get_client_data(device, &sa_client);
struct ib_sa_port *port;
struct ib_mad_agent *agent;
struct ib_sa_mad *mad;
int ret;
if (!sa_dev)
return -ENODEV;
if (method != IB_MGMT_METHOD_GET &&
method != IB_MGMT_METHOD_SET &&
method != IB_SA_METHOD_DELETE) {
return -EINVAL;
}
port = &sa_dev->port[port_num - sa_dev->start_port];
agent = port->agent;
query = kzalloc(sizeof(*query), gfp_mask);
if (!query)
return -ENOMEM;
query->sa_query.port = port;
ret = alloc_mad(&query->sa_query, gfp_mask);
if (ret)
goto err1;
ib_sa_client_get(client);
query->sa_query.client = client;
query->callback = callback;
query->context = context;
mad = query->sa_query.mad_buf->mad;
init_mad(mad, agent);
query->sa_query.callback = callback ? ib_sa_guidinfo_rec_callback : NULL;
query->sa_query.release = ib_sa_guidinfo_rec_release;
mad->mad_hdr.method = method;
mad->mad_hdr.attr_id = cpu_to_be16(IB_SA_ATTR_GUID_INFO_REC);
mad->sa_hdr.comp_mask = comp_mask;
ib_pack(guidinfo_rec_table, ARRAY_SIZE(guidinfo_rec_table), rec,
mad->data);
*sa_query = &query->sa_query;
ret = send_mad(&query->sa_query, timeout_ms, gfp_mask);
if (ret < 0)
goto err2;
return ret;
err2:
*sa_query = NULL;
ib_sa_client_put(query->sa_query.client);
free_mad(&query->sa_query);
err1:
kfree(query);
return ret;
}
EXPORT_SYMBOL(ib_sa_guid_info_rec_query);
static void send_handler(struct ib_mad_agent *agent,
struct ib_mad_send_wc *mad_send_wc)
{
struct ib_sa_query *query = mad_send_wc->send_buf->context[0];
unsigned long flags;
if (query->callback)
switch (mad_send_wc->status) {
case IB_WC_SUCCESS:
/* No callback -- already got recv */
break;
case IB_WC_RESP_TIMEOUT_ERR:
query->callback(query, -ETIMEDOUT, NULL);
break;
case IB_WC_WR_FLUSH_ERR:
query->callback(query, -EINTR, NULL);
break;
default:
query->callback(query, -EIO, NULL);
break;
}
spin_lock_irqsave(&idr_lock, flags);
idr_remove(&query_idr, query->id);
spin_unlock_irqrestore(&idr_lock, flags);
free_mad(query);
ib_sa_client_put(query->client);
query->release(query);
}
static void recv_handler(struct ib_mad_agent *mad_agent,
struct ib_mad_recv_wc *mad_recv_wc)
{
struct ib_sa_query *query;
struct ib_mad_send_buf *mad_buf;
mad_buf = (void *) (unsigned long) mad_recv_wc->wc->wr_id;
query = mad_buf->context[0];
if (query->callback) {
if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
query->callback(query,
mad_recv_wc->recv_buf.mad->mad_hdr.status ?
-EINVAL : 0,
(struct ib_sa_mad *) mad_recv_wc->recv_buf.mad);
else
query->callback(query, -EIO, NULL);
}
ib_free_recv_mad(mad_recv_wc);
}
static void ib_sa_add_one(struct ib_device *device)
{
struct ib_sa_device *sa_dev;
int s, e, i;
int count = 0;
s = rdma_start_port(device);
e = rdma_end_port(device);
sa_dev = kzalloc(sizeof *sa_dev +
(e - s + 1) * sizeof (struct ib_sa_port),
GFP_KERNEL);
if (!sa_dev)
return;
sa_dev->start_port = s;
sa_dev->end_port = e;
for (i = 0; i <= e - s; ++i) {
spin_lock_init(&sa_dev->port[i].ah_lock);
if (!rdma_cap_ib_sa(device, i + 1))
continue;
sa_dev->port[i].sm_ah = NULL;
sa_dev->port[i].port_num = i + s;
sa_dev->port[i].agent =
ib_register_mad_agent(device, i + s, IB_QPT_GSI,
NULL, 0, send_handler,
recv_handler, sa_dev, 0);
if (IS_ERR(sa_dev->port[i].agent))
goto err;
INIT_WORK(&sa_dev->port[i].update_task, update_sm_ah);
count++;
}
if (!count)
goto free;
ib_set_client_data(device, &sa_client, sa_dev);
/*
* We register our event handler after everything is set up,
* and then update our cached info after the event handler is
* registered to avoid any problems if a port changes state
* during our initialization.
*/
INIT_IB_EVENT_HANDLER(&sa_dev->event_handler, device, ib_sa_event);
if (ib_register_event_handler(&sa_dev->event_handler))
goto err;
for (i = 0; i <= e - s; ++i) {
if (rdma_cap_ib_sa(device, i + 1))
update_sm_ah(&sa_dev->port[i].update_task);
}
return;
err:
while (--i >= 0) {
if (rdma_cap_ib_sa(device, i + 1))
ib_unregister_mad_agent(sa_dev->port[i].agent);
}
free:
kfree(sa_dev);
return;
}
static void ib_sa_remove_one(struct ib_device *device, void *client_data)
{
struct ib_sa_device *sa_dev = client_data;
int i;
if (!sa_dev)
return;
ib_unregister_event_handler(&sa_dev->event_handler);
flush_workqueue(ib_wq);
for (i = 0; i <= sa_dev->end_port - sa_dev->start_port; ++i) {
if (rdma_cap_ib_sa(device, i + 1)) {
ib_unregister_mad_agent(sa_dev->port[i].agent);
if (sa_dev->port[i].sm_ah)
kref_put(&sa_dev->port[i].sm_ah->ref, free_sm_ah);
}
}
kfree(sa_dev);
}
static int __init ib_sa_init(void)
{
int ret;
get_random_bytes(&tid, sizeof tid);
atomic_set(&ib_nl_sa_request_seq, 0);
ret = ib_register_client(&sa_client);
if (ret) {
printk(KERN_ERR "Couldn't register ib_sa client\n");
goto err1;
}
ret = mcast_init();
if (ret) {
printk(KERN_ERR "Couldn't initialize multicast handling\n");
goto err2;
}
ib_nl_wq = create_singlethread_workqueue("ib_nl_sa_wq");
if (!ib_nl_wq) {
ret = -ENOMEM;
goto err3;
}
if (ibnl_add_client(RDMA_NL_LS, RDMA_NL_LS_NUM_OPS,
ib_sa_cb_table)) {
pr_err("Failed to add netlink callback\n");
ret = -EINVAL;
goto err4;
}
INIT_DELAYED_WORK(&ib_nl_timed_work, ib_nl_request_timeout);
return 0;
err4:
destroy_workqueue(ib_nl_wq);
err3:
mcast_cleanup();
err2:
ib_unregister_client(&sa_client);
err1:
return ret;
}
static void __exit ib_sa_cleanup(void)
{
ibnl_remove_client(RDMA_NL_LS);
cancel_delayed_work(&ib_nl_timed_work);
flush_workqueue(ib_nl_wq);
destroy_workqueue(ib_nl_wq);
mcast_cleanup();
ib_unregister_client(&sa_client);
idr_destroy(&query_idr);
}
module_init(ib_sa_init);
module_exit(ib_sa_cleanup);
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