![Mustafa Ismail](/assets/img/avatar_default.png)
During connection establishment with a large number of connections, it is possible that the connection requests might fail. Adding flow control prevents this failure. Change ibnl_unicast to use blocking to enable flow control. Signed-off-by: Mustafa Ismail <mustafa.ismail@intel.com> Signed-off-by: Faisal Latif <faisal.latif@intel.com> Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
275 lines
6.6 KiB
C
275 lines
6.6 KiB
C
/*
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* Copyright (c) 2010 Voltaire Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#define pr_fmt(fmt) "%s:%s: " fmt, KBUILD_MODNAME, __func__
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#include <linux/export.h>
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#include <net/netlink.h>
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#include <net/net_namespace.h>
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#include <net/sock.h>
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#include <rdma/rdma_netlink.h>
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struct ibnl_client {
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struct list_head list;
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int index;
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int nops;
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const struct ibnl_client_cbs *cb_table;
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};
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static DEFINE_MUTEX(ibnl_mutex);
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static struct sock *nls;
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static LIST_HEAD(client_list);
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int ibnl_chk_listeners(unsigned int group)
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{
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if (netlink_has_listeners(nls, group) == 0)
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return -1;
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return 0;
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}
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EXPORT_SYMBOL(ibnl_chk_listeners);
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int ibnl_add_client(int index, int nops,
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const struct ibnl_client_cbs cb_table[])
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{
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struct ibnl_client *cur;
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struct ibnl_client *nl_client;
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nl_client = kmalloc(sizeof *nl_client, GFP_KERNEL);
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if (!nl_client)
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return -ENOMEM;
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nl_client->index = index;
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nl_client->nops = nops;
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nl_client->cb_table = cb_table;
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mutex_lock(&ibnl_mutex);
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list_for_each_entry(cur, &client_list, list) {
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if (cur->index == index) {
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pr_warn("Client for %d already exists\n", index);
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mutex_unlock(&ibnl_mutex);
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kfree(nl_client);
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return -EINVAL;
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}
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}
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list_add_tail(&nl_client->list, &client_list);
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mutex_unlock(&ibnl_mutex);
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return 0;
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}
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EXPORT_SYMBOL(ibnl_add_client);
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int ibnl_remove_client(int index)
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{
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struct ibnl_client *cur, *next;
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mutex_lock(&ibnl_mutex);
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list_for_each_entry_safe(cur, next, &client_list, list) {
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if (cur->index == index) {
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list_del(&(cur->list));
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mutex_unlock(&ibnl_mutex);
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kfree(cur);
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return 0;
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}
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}
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pr_warn("Can't remove callback for client idx %d. Not found\n", index);
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mutex_unlock(&ibnl_mutex);
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return -EINVAL;
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}
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EXPORT_SYMBOL(ibnl_remove_client);
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void *ibnl_put_msg(struct sk_buff *skb, struct nlmsghdr **nlh, int seq,
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int len, int client, int op, int flags)
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{
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unsigned char *prev_tail;
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prev_tail = skb_tail_pointer(skb);
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*nlh = nlmsg_put(skb, 0, seq, RDMA_NL_GET_TYPE(client, op),
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len, flags);
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if (!*nlh)
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goto out_nlmsg_trim;
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(*nlh)->nlmsg_len = skb_tail_pointer(skb) - prev_tail;
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return nlmsg_data(*nlh);
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out_nlmsg_trim:
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nlmsg_trim(skb, prev_tail);
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return NULL;
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}
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EXPORT_SYMBOL(ibnl_put_msg);
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int ibnl_put_attr(struct sk_buff *skb, struct nlmsghdr *nlh,
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int len, void *data, int type)
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{
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unsigned char *prev_tail;
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prev_tail = skb_tail_pointer(skb);
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if (nla_put(skb, type, len, data))
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goto nla_put_failure;
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nlh->nlmsg_len += skb_tail_pointer(skb) - prev_tail;
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return 0;
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nla_put_failure:
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nlmsg_trim(skb, prev_tail - nlh->nlmsg_len);
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return -EMSGSIZE;
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}
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EXPORT_SYMBOL(ibnl_put_attr);
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static int ibnl_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
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{
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struct ibnl_client *client;
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int type = nlh->nlmsg_type;
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int index = RDMA_NL_GET_CLIENT(type);
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unsigned int op = RDMA_NL_GET_OP(type);
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list_for_each_entry(client, &client_list, list) {
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if (client->index == index) {
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if (op >= client->nops || !client->cb_table[op].dump)
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return -EINVAL;
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/*
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* For response or local service set_timeout request,
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* there is no need to use netlink_dump_start.
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*/
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if (!(nlh->nlmsg_flags & NLM_F_REQUEST) ||
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(index == RDMA_NL_LS &&
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op == RDMA_NL_LS_OP_SET_TIMEOUT)) {
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struct netlink_callback cb = {
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.skb = skb,
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.nlh = nlh,
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.dump = client->cb_table[op].dump,
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.module = client->cb_table[op].module,
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};
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return cb.dump(skb, &cb);
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}
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{
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struct netlink_dump_control c = {
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.dump = client->cb_table[op].dump,
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.module = client->cb_table[op].module,
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};
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return netlink_dump_start(nls, skb, nlh, &c);
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}
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}
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}
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pr_info("Index %d wasn't found in client list\n", index);
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return -EINVAL;
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}
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static void ibnl_rcv_reply_skb(struct sk_buff *skb)
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{
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struct nlmsghdr *nlh;
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int msglen;
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/*
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* Process responses until there is no more message or the first
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* request. Generally speaking, it is not recommended to mix responses
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* with requests.
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*/
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while (skb->len >= nlmsg_total_size(0)) {
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nlh = nlmsg_hdr(skb);
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if (nlh->nlmsg_len < NLMSG_HDRLEN || skb->len < nlh->nlmsg_len)
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return;
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/* Handle response only */
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if (nlh->nlmsg_flags & NLM_F_REQUEST)
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return;
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ibnl_rcv_msg(skb, nlh);
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msglen = NLMSG_ALIGN(nlh->nlmsg_len);
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if (msglen > skb->len)
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msglen = skb->len;
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skb_pull(skb, msglen);
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}
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}
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static void ibnl_rcv(struct sk_buff *skb)
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{
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mutex_lock(&ibnl_mutex);
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ibnl_rcv_reply_skb(skb);
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netlink_rcv_skb(skb, &ibnl_rcv_msg);
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mutex_unlock(&ibnl_mutex);
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}
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int ibnl_unicast(struct sk_buff *skb, struct nlmsghdr *nlh,
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__u32 pid)
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{
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int err;
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err = netlink_unicast(nls, skb, pid, 0);
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return (err < 0) ? err : 0;
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}
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EXPORT_SYMBOL(ibnl_unicast);
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int ibnl_multicast(struct sk_buff *skb, struct nlmsghdr *nlh,
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unsigned int group, gfp_t flags)
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{
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return nlmsg_multicast(nls, skb, 0, group, flags);
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}
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EXPORT_SYMBOL(ibnl_multicast);
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int __init ibnl_init(void)
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{
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struct netlink_kernel_cfg cfg = {
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.input = ibnl_rcv,
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};
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nls = netlink_kernel_create(&init_net, NETLINK_RDMA, &cfg);
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if (!nls) {
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pr_warn("Failed to create netlink socket\n");
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return -ENOMEM;
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}
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nls->sk_sndtimeo = 10 * HZ;
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return 0;
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}
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void ibnl_cleanup(void)
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{
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struct ibnl_client *cur, *next;
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mutex_lock(&ibnl_mutex);
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list_for_each_entry_safe(cur, next, &client_list, list) {
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list_del(&(cur->list));
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kfree(cur);
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}
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mutex_unlock(&ibnl_mutex);
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netlink_kernel_release(nls);
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}
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