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linux-sg2042/drivers/infiniband/core/iwpm_util.c

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/*
* Copyright (c) 2014 Chelsio, Inc. All rights reserved.
* Copyright (c) 2014 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 "iwpm_util.h"
#define IWPM_MAPINFO_HASH_SIZE 512
#define IWPM_MAPINFO_HASH_MASK (IWPM_MAPINFO_HASH_SIZE - 1)
#define IWPM_REMINFO_HASH_SIZE 64
#define IWPM_REMINFO_HASH_MASK (IWPM_REMINFO_HASH_SIZE - 1)
#define IWPM_MSG_SIZE 512
static LIST_HEAD(iwpm_nlmsg_req_list);
static DEFINE_SPINLOCK(iwpm_nlmsg_req_lock);
static struct hlist_head *iwpm_hash_bucket;
static DEFINE_SPINLOCK(iwpm_mapinfo_lock);
static struct hlist_head *iwpm_reminfo_bucket;
static DEFINE_SPINLOCK(iwpm_reminfo_lock);
static DEFINE_MUTEX(iwpm_admin_lock);
static struct iwpm_admin_data iwpm_admin;
/**
* iwpm_init - Allocate resources for the iwarp port mapper
* @nl_client: The index of the netlink client
*
* Should be called when network interface goes up.
*/
int iwpm_init(u8 nl_client)
{
int ret = 0;
mutex_lock(&iwpm_admin_lock);
if (atomic_read(&iwpm_admin.refcount) == 0) {
iwpm_hash_bucket = kcalloc(IWPM_MAPINFO_HASH_SIZE,
sizeof(struct hlist_head),
GFP_KERNEL);
if (!iwpm_hash_bucket) {
ret = -ENOMEM;
goto init_exit;
}
iwpm_reminfo_bucket = kcalloc(IWPM_REMINFO_HASH_SIZE,
sizeof(struct hlist_head),
GFP_KERNEL);
if (!iwpm_reminfo_bucket) {
kfree(iwpm_hash_bucket);
ret = -ENOMEM;
goto init_exit;
}
}
atomic_inc(&iwpm_admin.refcount);
init_exit:
mutex_unlock(&iwpm_admin_lock);
if (!ret) {
iwpm_set_valid(nl_client, 1);
iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
pr_debug("%s: Mapinfo and reminfo tables are created\n",
__func__);
}
return ret;
}
static void free_hash_bucket(void);
static void free_reminfo_bucket(void);
/**
* iwpm_exit - Deallocate resources for the iwarp port mapper
* @nl_client: The index of the netlink client
*
* Should be called when network interface goes down.
*/
int iwpm_exit(u8 nl_client)
{
if (!iwpm_valid_client(nl_client))
return -EINVAL;
mutex_lock(&iwpm_admin_lock);
if (atomic_read(&iwpm_admin.refcount) == 0) {
mutex_unlock(&iwpm_admin_lock);
pr_err("%s Incorrect usage - negative refcount\n", __func__);
return -EINVAL;
}
if (atomic_dec_and_test(&iwpm_admin.refcount)) {
free_hash_bucket();
free_reminfo_bucket();
pr_debug("%s: Resources are destroyed\n", __func__);
}
mutex_unlock(&iwpm_admin_lock);
iwpm_set_valid(nl_client, 0);
iwpm_set_registration(nl_client, IWPM_REG_UNDEF);
return 0;
}
static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage *,
struct sockaddr_storage *);
/**
* iwpm_create_mapinfo - Store local and mapped IPv4/IPv6 address
* info in a hash table
* @local_addr: Local ip/tcp address
* @mapped_addr: Mapped local ip/tcp address
* @nl_client: The index of the netlink client
* @map_flags: IWPM mapping flags
*/
int iwpm_create_mapinfo(struct sockaddr_storage *local_sockaddr,
struct sockaddr_storage *mapped_sockaddr,
u8 nl_client, u32 map_flags)
{
struct hlist_head *hash_bucket_head = NULL;
struct iwpm_mapping_info *map_info;
unsigned long flags;
int ret = -EINVAL;
if (!iwpm_valid_client(nl_client))
return ret;
map_info = kzalloc(sizeof(struct iwpm_mapping_info), GFP_KERNEL);
if (!map_info)
return -ENOMEM;
memcpy(&map_info->local_sockaddr, local_sockaddr,
sizeof(struct sockaddr_storage));
memcpy(&map_info->mapped_sockaddr, mapped_sockaddr,
sizeof(struct sockaddr_storage));
map_info->nl_client = nl_client;
map_info->map_flags = map_flags;
spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
if (iwpm_hash_bucket) {
hash_bucket_head = get_mapinfo_hash_bucket(
&map_info->local_sockaddr,
&map_info->mapped_sockaddr);
if (hash_bucket_head) {
hlist_add_head(&map_info->hlist_node, hash_bucket_head);
ret = 0;
}
}
spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
if (!hash_bucket_head)
kfree(map_info);
return ret;
}
/**
* iwpm_remove_mapinfo - Remove local and mapped IPv4/IPv6 address
* info from the hash table
* @local_addr: Local ip/tcp address
* @mapped_local_addr: Mapped local ip/tcp address
*
* Returns err code if mapping info is not found in the hash table,
* otherwise returns 0
*/
int iwpm_remove_mapinfo(struct sockaddr_storage *local_sockaddr,
struct sockaddr_storage *mapped_local_addr)
{
struct hlist_node *tmp_hlist_node;
struct hlist_head *hash_bucket_head;
struct iwpm_mapping_info *map_info = NULL;
unsigned long flags;
int ret = -EINVAL;
spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
if (iwpm_hash_bucket) {
hash_bucket_head = get_mapinfo_hash_bucket(
local_sockaddr,
mapped_local_addr);
if (!hash_bucket_head)
goto remove_mapinfo_exit;
hlist_for_each_entry_safe(map_info, tmp_hlist_node,
hash_bucket_head, hlist_node) {
if (!iwpm_compare_sockaddr(&map_info->mapped_sockaddr,
mapped_local_addr)) {
hlist_del_init(&map_info->hlist_node);
kfree(map_info);
ret = 0;
break;
}
}
}
remove_mapinfo_exit:
spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
return ret;
}
static void free_hash_bucket(void)
{
struct hlist_node *tmp_hlist_node;
struct iwpm_mapping_info *map_info;
unsigned long flags;
int i;
/* remove all the mapinfo data from the list */
spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
hlist_for_each_entry_safe(map_info, tmp_hlist_node,
&iwpm_hash_bucket[i], hlist_node) {
hlist_del_init(&map_info->hlist_node);
kfree(map_info);
}
}
/* free the hash list */
kfree(iwpm_hash_bucket);
iwpm_hash_bucket = NULL;
spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
}
static void free_reminfo_bucket(void)
{
struct hlist_node *tmp_hlist_node;
struct iwpm_remote_info *rem_info;
unsigned long flags;
int i;
/* remove all the remote info from the list */
spin_lock_irqsave(&iwpm_reminfo_lock, flags);
for (i = 0; i < IWPM_REMINFO_HASH_SIZE; i++) {
hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
&iwpm_reminfo_bucket[i], hlist_node) {
hlist_del_init(&rem_info->hlist_node);
kfree(rem_info);
}
}
/* free the hash list */
kfree(iwpm_reminfo_bucket);
iwpm_reminfo_bucket = NULL;
spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
}
static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage *,
struct sockaddr_storage *);
void iwpm_add_remote_info(struct iwpm_remote_info *rem_info)
{
struct hlist_head *hash_bucket_head;
unsigned long flags;
spin_lock_irqsave(&iwpm_reminfo_lock, flags);
if (iwpm_reminfo_bucket) {
hash_bucket_head = get_reminfo_hash_bucket(
&rem_info->mapped_loc_sockaddr,
&rem_info->mapped_rem_sockaddr);
if (hash_bucket_head)
hlist_add_head(&rem_info->hlist_node, hash_bucket_head);
}
spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
}
/**
* iwpm_get_remote_info - Get the remote connecting peer address info
*
* @mapped_loc_addr: Mapped local address of the listening peer
* @mapped_rem_addr: Mapped remote address of the connecting peer
* @remote_addr: To store the remote address of the connecting peer
* @nl_client: The index of the netlink client
*
* The remote address info is retrieved and provided to the client in
* the remote_addr. After that it is removed from the hash table
*/
int iwpm_get_remote_info(struct sockaddr_storage *mapped_loc_addr,
struct sockaddr_storage *mapped_rem_addr,
struct sockaddr_storage *remote_addr,
u8 nl_client)
{
struct hlist_node *tmp_hlist_node;
struct hlist_head *hash_bucket_head;
struct iwpm_remote_info *rem_info = NULL;
unsigned long flags;
int ret = -EINVAL;
if (!iwpm_valid_client(nl_client)) {
pr_info("%s: Invalid client = %d\n", __func__, nl_client);
return ret;
}
spin_lock_irqsave(&iwpm_reminfo_lock, flags);
if (iwpm_reminfo_bucket) {
hash_bucket_head = get_reminfo_hash_bucket(
mapped_loc_addr,
mapped_rem_addr);
if (!hash_bucket_head)
goto get_remote_info_exit;
hlist_for_each_entry_safe(rem_info, tmp_hlist_node,
hash_bucket_head, hlist_node) {
if (!iwpm_compare_sockaddr(&rem_info->mapped_loc_sockaddr,
mapped_loc_addr) &&
!iwpm_compare_sockaddr(&rem_info->mapped_rem_sockaddr,
mapped_rem_addr)) {
memcpy(remote_addr, &rem_info->remote_sockaddr,
sizeof(struct sockaddr_storage));
iwpm_print_sockaddr(remote_addr,
"get_remote_info: Remote sockaddr:");
hlist_del_init(&rem_info->hlist_node);
kfree(rem_info);
ret = 0;
break;
}
}
}
get_remote_info_exit:
spin_unlock_irqrestore(&iwpm_reminfo_lock, flags);
return ret;
}
struct iwpm_nlmsg_request *iwpm_get_nlmsg_request(__u32 nlmsg_seq,
u8 nl_client, gfp_t gfp)
{
struct iwpm_nlmsg_request *nlmsg_request = NULL;
unsigned long flags;
nlmsg_request = kzalloc(sizeof(struct iwpm_nlmsg_request), gfp);
if (!nlmsg_request)
return NULL;
spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
list_add_tail(&nlmsg_request->inprocess_list, &iwpm_nlmsg_req_list);
spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
kref_init(&nlmsg_request->kref);
kref_get(&nlmsg_request->kref);
nlmsg_request->nlmsg_seq = nlmsg_seq;
nlmsg_request->nl_client = nl_client;
nlmsg_request->request_done = 0;
nlmsg_request->err_code = 0;
sema_init(&nlmsg_request->sem, 1);
down(&nlmsg_request->sem);
return nlmsg_request;
}
void iwpm_free_nlmsg_request(struct kref *kref)
{
struct iwpm_nlmsg_request *nlmsg_request;
unsigned long flags;
nlmsg_request = container_of(kref, struct iwpm_nlmsg_request, kref);
spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
list_del_init(&nlmsg_request->inprocess_list);
spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
if (!nlmsg_request->request_done)
pr_debug("%s Freeing incomplete nlmsg request (seq = %u).\n",
__func__, nlmsg_request->nlmsg_seq);
kfree(nlmsg_request);
}
struct iwpm_nlmsg_request *iwpm_find_nlmsg_request(__u32 echo_seq)
{
struct iwpm_nlmsg_request *nlmsg_request;
struct iwpm_nlmsg_request *found_request = NULL;
unsigned long flags;
spin_lock_irqsave(&iwpm_nlmsg_req_lock, flags);
list_for_each_entry(nlmsg_request, &iwpm_nlmsg_req_list,
inprocess_list) {
if (nlmsg_request->nlmsg_seq == echo_seq) {
found_request = nlmsg_request;
kref_get(&nlmsg_request->kref);
break;
}
}
spin_unlock_irqrestore(&iwpm_nlmsg_req_lock, flags);
return found_request;
}
int iwpm_wait_complete_req(struct iwpm_nlmsg_request *nlmsg_request)
{
int ret;
ret = down_timeout(&nlmsg_request->sem, IWPM_NL_TIMEOUT);
if (ret) {
ret = -EINVAL;
pr_info("%s: Timeout %d sec for netlink request (seq = %u)\n",
__func__, (IWPM_NL_TIMEOUT/HZ), nlmsg_request->nlmsg_seq);
} else {
ret = nlmsg_request->err_code;
}
kref_put(&nlmsg_request->kref, iwpm_free_nlmsg_request);
return ret;
}
int iwpm_get_nlmsg_seq(void)
{
return atomic_inc_return(&iwpm_admin.nlmsg_seq);
}
int iwpm_valid_client(u8 nl_client)
{
return iwpm_admin.client_list[nl_client];
}
void iwpm_set_valid(u8 nl_client, int valid)
{
iwpm_admin.client_list[nl_client] = valid;
}
/* valid client */
u32 iwpm_get_registration(u8 nl_client)
{
return iwpm_admin.reg_list[nl_client];
}
/* valid client */
void iwpm_set_registration(u8 nl_client, u32 reg)
{
iwpm_admin.reg_list[nl_client] = reg;
}
/* valid client */
u32 iwpm_check_registration(u8 nl_client, u32 reg)
{
return (iwpm_get_registration(nl_client) & reg);
}
int iwpm_compare_sockaddr(struct sockaddr_storage *a_sockaddr,
struct sockaddr_storage *b_sockaddr)
{
if (a_sockaddr->ss_family != b_sockaddr->ss_family)
return 1;
if (a_sockaddr->ss_family == AF_INET) {
struct sockaddr_in *a4_sockaddr =
(struct sockaddr_in *)a_sockaddr;
struct sockaddr_in *b4_sockaddr =
(struct sockaddr_in *)b_sockaddr;
if (!memcmp(&a4_sockaddr->sin_addr,
&b4_sockaddr->sin_addr, sizeof(struct in_addr))
&& a4_sockaddr->sin_port == b4_sockaddr->sin_port)
return 0;
} else if (a_sockaddr->ss_family == AF_INET6) {
struct sockaddr_in6 *a6_sockaddr =
(struct sockaddr_in6 *)a_sockaddr;
struct sockaddr_in6 *b6_sockaddr =
(struct sockaddr_in6 *)b_sockaddr;
if (!memcmp(&a6_sockaddr->sin6_addr,
&b6_sockaddr->sin6_addr, sizeof(struct in6_addr))
&& a6_sockaddr->sin6_port == b6_sockaddr->sin6_port)
return 0;
} else {
pr_err("%s: Invalid sockaddr family\n", __func__);
}
return 1;
}
struct sk_buff *iwpm_create_nlmsg(u32 nl_op, struct nlmsghdr **nlh,
int nl_client)
{
struct sk_buff *skb = NULL;
skb = dev_alloc_skb(IWPM_MSG_SIZE);
if (!skb)
goto create_nlmsg_exit;
if (!(ibnl_put_msg(skb, nlh, 0, 0, nl_client, nl_op,
NLM_F_REQUEST))) {
pr_warn("%s: Unable to put the nlmsg header\n", __func__);
dev_kfree_skb(skb);
skb = NULL;
}
create_nlmsg_exit:
return skb;
}
int iwpm_parse_nlmsg(struct netlink_callback *cb, int policy_max,
const struct nla_policy *nlmsg_policy,
struct nlattr *nltb[], const char *msg_type)
{
int nlh_len = 0;
int ret;
const char *err_str = "";
ret = nlmsg_validate_deprecated(cb->nlh, nlh_len, policy_max - 1,
nlmsg_policy, NULL);
if (ret) {
err_str = "Invalid attribute";
goto parse_nlmsg_error;
}
ret = nlmsg_parse_deprecated(cb->nlh, nlh_len, nltb, policy_max - 1,
nlmsg_policy, NULL);
if (ret) {
err_str = "Unable to parse the nlmsg";
goto parse_nlmsg_error;
}
ret = iwpm_validate_nlmsg_attr(nltb, policy_max);
if (ret) {
err_str = "Invalid NULL attribute";
goto parse_nlmsg_error;
}
return 0;
parse_nlmsg_error:
pr_warn("%s: %s (msg type %s ret = %d)\n",
__func__, err_str, msg_type, ret);
return ret;
}
void iwpm_print_sockaddr(struct sockaddr_storage *sockaddr, char *msg)
{
struct sockaddr_in6 *sockaddr_v6;
struct sockaddr_in *sockaddr_v4;
switch (sockaddr->ss_family) {
case AF_INET:
sockaddr_v4 = (struct sockaddr_in *)sockaddr;
pr_debug("%s IPV4 %pI4: %u(0x%04X)\n",
msg, &sockaddr_v4->sin_addr,
ntohs(sockaddr_v4->sin_port),
ntohs(sockaddr_v4->sin_port));
break;
case AF_INET6:
sockaddr_v6 = (struct sockaddr_in6 *)sockaddr;
pr_debug("%s IPV6 %pI6: %u(0x%04X)\n",
msg, &sockaddr_v6->sin6_addr,
ntohs(sockaddr_v6->sin6_port),
ntohs(sockaddr_v6->sin6_port));
break;
default:
break;
}
}
static u32 iwpm_ipv6_jhash(struct sockaddr_in6 *ipv6_sockaddr)
{
u32 ipv6_hash = jhash(&ipv6_sockaddr->sin6_addr, sizeof(struct in6_addr), 0);
u32 hash = jhash_2words(ipv6_hash, (__force u32) ipv6_sockaddr->sin6_port, 0);
return hash;
}
static u32 iwpm_ipv4_jhash(struct sockaddr_in *ipv4_sockaddr)
{
u32 ipv4_hash = jhash(&ipv4_sockaddr->sin_addr, sizeof(struct in_addr), 0);
u32 hash = jhash_2words(ipv4_hash, (__force u32) ipv4_sockaddr->sin_port, 0);
return hash;
}
static int get_hash_bucket(struct sockaddr_storage *a_sockaddr,
struct sockaddr_storage *b_sockaddr, u32 *hash)
{
u32 a_hash, b_hash;
if (a_sockaddr->ss_family == AF_INET) {
a_hash = iwpm_ipv4_jhash((struct sockaddr_in *) a_sockaddr);
b_hash = iwpm_ipv4_jhash((struct sockaddr_in *) b_sockaddr);
} else if (a_sockaddr->ss_family == AF_INET6) {
a_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) a_sockaddr);
b_hash = iwpm_ipv6_jhash((struct sockaddr_in6 *) b_sockaddr);
} else {
pr_err("%s: Invalid sockaddr family\n", __func__);
return -EINVAL;
}
if (a_hash == b_hash) /* if port mapper isn't available */
*hash = a_hash;
else
*hash = jhash_2words(a_hash, b_hash, 0);
return 0;
}
static struct hlist_head *get_mapinfo_hash_bucket(struct sockaddr_storage
*local_sockaddr, struct sockaddr_storage
*mapped_sockaddr)
{
u32 hash;
int ret;
ret = get_hash_bucket(local_sockaddr, mapped_sockaddr, &hash);
if (ret)
return NULL;
return &iwpm_hash_bucket[hash & IWPM_MAPINFO_HASH_MASK];
}
static struct hlist_head *get_reminfo_hash_bucket(struct sockaddr_storage
*mapped_loc_sockaddr, struct sockaddr_storage
*mapped_rem_sockaddr)
{
u32 hash;
int ret;
ret = get_hash_bucket(mapped_loc_sockaddr, mapped_rem_sockaddr, &hash);
if (ret)
return NULL;
return &iwpm_reminfo_bucket[hash & IWPM_REMINFO_HASH_MASK];
}
static int send_mapinfo_num(u32 mapping_num, u8 nl_client, int iwpm_pid)
{
struct sk_buff *skb = NULL;
struct nlmsghdr *nlh;
u32 msg_seq;
const char *err_str = "";
int ret = -EINVAL;
skb = iwpm_create_nlmsg(RDMA_NL_IWPM_MAPINFO_NUM, &nlh, nl_client);
if (!skb) {
err_str = "Unable to create a nlmsg";
goto mapinfo_num_error;
}
nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
msg_seq = 0;
err_str = "Unable to put attribute of mapinfo number nlmsg";
ret = ibnl_put_attr(skb, nlh, sizeof(u32), &msg_seq, IWPM_NLA_MAPINFO_SEQ);
if (ret)
goto mapinfo_num_error;
ret = ibnl_put_attr(skb, nlh, sizeof(u32),
&mapping_num, IWPM_NLA_MAPINFO_SEND_NUM);
if (ret)
goto mapinfo_num_error;
nlmsg_end(skb, nlh);
ret = rdma_nl_unicast(&init_net, skb, iwpm_pid);
if (ret) {
skb = NULL;
err_str = "Unable to send a nlmsg";
goto mapinfo_num_error;
}
pr_debug("%s: Sent mapping number = %d\n", __func__, mapping_num);
return 0;
mapinfo_num_error:
pr_info("%s: %s\n", __func__, err_str);
dev_kfree_skb(skb);
return ret;
}
static int send_nlmsg_done(struct sk_buff *skb, u8 nl_client, int iwpm_pid)
{
struct nlmsghdr *nlh = NULL;
int ret = 0;
if (!skb)
return ret;
if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
pr_warn("%s Unable to put NLMSG_DONE\n", __func__);
dev_kfree_skb(skb);
return -ENOMEM;
}
nlh->nlmsg_type = NLMSG_DONE;
ret = rdma_nl_unicast(&init_net, skb, iwpm_pid);
if (ret)
pr_warn("%s Unable to send a nlmsg\n", __func__);
return ret;
}
int iwpm_send_mapinfo(u8 nl_client, int iwpm_pid)
{
struct iwpm_mapping_info *map_info;
struct sk_buff *skb = NULL;
struct nlmsghdr *nlh;
int skb_num = 0, mapping_num = 0;
int i = 0, nlmsg_bytes = 0;
unsigned long flags;
const char *err_str = "";
int ret;
skb = dev_alloc_skb(NLMSG_GOODSIZE);
if (!skb) {
ret = -ENOMEM;
err_str = "Unable to allocate skb";
goto send_mapping_info_exit;
}
skb_num++;
spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
ret = -EINVAL;
for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
hlist_for_each_entry(map_info, &iwpm_hash_bucket[i],
hlist_node) {
if (map_info->nl_client != nl_client)
continue;
nlh = NULL;
if (!(ibnl_put_msg(skb, &nlh, 0, 0, nl_client,
RDMA_NL_IWPM_MAPINFO, NLM_F_MULTI))) {
ret = -ENOMEM;
err_str = "Unable to put the nlmsg header";
goto send_mapping_info_unlock;
}
err_str = "Unable to put attribute of the nlmsg";
ret = ibnl_put_attr(skb, nlh,
sizeof(struct sockaddr_storage),
&map_info->local_sockaddr,
IWPM_NLA_MAPINFO_LOCAL_ADDR);
if (ret)
goto send_mapping_info_unlock;
ret = ibnl_put_attr(skb, nlh,
sizeof(struct sockaddr_storage),
&map_info->mapped_sockaddr,
IWPM_NLA_MAPINFO_MAPPED_ADDR);
if (ret)
goto send_mapping_info_unlock;
if (iwpm_ulib_version > IWPM_UABI_VERSION_MIN) {
ret = ibnl_put_attr(skb, nlh, sizeof(u32),
&map_info->map_flags,
IWPM_NLA_MAPINFO_FLAGS);
if (ret)
goto send_mapping_info_unlock;
}
nlmsg_end(skb, nlh);
iwpm_print_sockaddr(&map_info->local_sockaddr,
"send_mapping_info: Local sockaddr:");
iwpm_print_sockaddr(&map_info->mapped_sockaddr,
"send_mapping_info: Mapped local sockaddr:");
mapping_num++;
nlmsg_bytes += nlh->nlmsg_len;
/* check if all mappings can fit in one skb */
if (NLMSG_GOODSIZE - nlmsg_bytes < nlh->nlmsg_len * 2) {
/* and leave room for NLMSG_DONE */
nlmsg_bytes = 0;
skb_num++;
spin_unlock_irqrestore(&iwpm_mapinfo_lock,
flags);
/* send the skb */
ret = send_nlmsg_done(skb, nl_client, iwpm_pid);
skb = NULL;
if (ret) {
err_str = "Unable to send map info";
goto send_mapping_info_exit;
}
if (skb_num == IWPM_MAPINFO_SKB_COUNT) {
ret = -ENOMEM;
err_str = "Insufficient skbs for map info";
goto send_mapping_info_exit;
}
skb = dev_alloc_skb(NLMSG_GOODSIZE);
if (!skb) {
ret = -ENOMEM;
err_str = "Unable to allocate skb";
goto send_mapping_info_exit;
}
spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
}
}
}
send_mapping_info_unlock:
spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
send_mapping_info_exit:
if (ret) {
pr_warn("%s: %s (ret = %d)\n", __func__, err_str, ret);
dev_kfree_skb(skb);
return ret;
}
send_nlmsg_done(skb, nl_client, iwpm_pid);
return send_mapinfo_num(mapping_num, nl_client, iwpm_pid);
}
int iwpm_mapinfo_available(void)
{
unsigned long flags;
int full_bucket = 0, i = 0;
spin_lock_irqsave(&iwpm_mapinfo_lock, flags);
if (iwpm_hash_bucket) {
for (i = 0; i < IWPM_MAPINFO_HASH_SIZE; i++) {
if (!hlist_empty(&iwpm_hash_bucket[i])) {
full_bucket = 1;
break;
}
}
}
spin_unlock_irqrestore(&iwpm_mapinfo_lock, flags);
return full_bucket;
}
int iwpm_send_hello(u8 nl_client, int iwpm_pid, u16 abi_version)
{
struct sk_buff *skb = NULL;
struct nlmsghdr *nlh;
const char *err_str = "";
int ret = -EINVAL;
skb = iwpm_create_nlmsg(RDMA_NL_IWPM_HELLO, &nlh, nl_client);
if (!skb) {
err_str = "Unable to create a nlmsg";
goto hello_num_error;
}
nlh->nlmsg_seq = iwpm_get_nlmsg_seq();
err_str = "Unable to put attribute of abi_version into nlmsg";
ret = ibnl_put_attr(skb, nlh, sizeof(u16), &abi_version,
IWPM_NLA_HELLO_ABI_VERSION);
if (ret)
goto hello_num_error;
nlmsg_end(skb, nlh);
ret = rdma_nl_unicast(&init_net, skb, iwpm_pid);
if (ret) {
skb = NULL;
err_str = "Unable to send a nlmsg";
goto hello_num_error;
}
pr_debug("%s: Sent hello abi_version = %u\n", __func__, abi_version);
return 0;
hello_num_error:
pr_info("%s: %s\n", __func__, err_str);
dev_kfree_skb(skb);
return ret;
}
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