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af_smc.c
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af_smc.c
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// SPDX-License-Identifier: GPL-2.0-only
/*
* Shared Memory Communications over RDMA (SMC-R) and RoCE
*
* AF_SMC protocol family socket handler keeping the AF_INET sock address type
* applies to SOCK_STREAM sockets only
* offers an alternative communication option for TCP-protocol sockets
* applicable with RoCE-cards only
*
* Initial restrictions:
* - support for alternate links postponed
*
* Copyright IBM Corp. 2016, 2018
*
* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
* based on prototype from Frank Blaschka
*/
#define KMSG_COMPONENT "smc"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
#include <linux/module.h>
#include <linux/socket.h>
#include <linux/workqueue.h>
#include <linux/in.h>
#include <linux/sched/signal.h>
#include <linux/if_vlan.h>
#include <linux/rcupdate_wait.h>
#include <linux/ctype.h>
#include <net/sock.h>
#include <net/tcp.h>
#include <net/smc.h>
#include <asm/ioctls.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include "smc_netns.h"
#include "smc.h"
#include "smc_clc.h"
#include "smc_llc.h"
#include "smc_cdc.h"
#include "smc_core.h"
#include "smc_ib.h"
#include "smc_ism.h"
#include "smc_pnet.h"
#include "smc_netlink.h"
#include "smc_tx.h"
#include "smc_rx.h"
#include "smc_close.h"
#include "smc_stats.h"
static DEFINE_MUTEX(smc_server_lgr_pending); /* serialize link group
* creation on server
*/
static DEFINE_MUTEX(smc_client_lgr_pending); /* serialize link group
* creation on client
*/
struct workqueue_struct *smc_hs_wq; /* wq for handshake work */
struct workqueue_struct *smc_close_wq; /* wq for close work */
static void smc_tcp_listen_work(struct work_struct *);
static void smc_connect_work(struct work_struct *);
static void smc_set_keepalive(struct sock *sk, int val)
{
struct smc_sock *smc = smc_sk(sk);
smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
}
static struct smc_hashinfo smc_v4_hashinfo = {
.lock = __RW_LOCK_UNLOCKED(smc_v4_hashinfo.lock),
};
static struct smc_hashinfo smc_v6_hashinfo = {
.lock = __RW_LOCK_UNLOCKED(smc_v6_hashinfo.lock),
};
int smc_hash_sk(struct sock *sk)
{
struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
struct hlist_head *head;
head = &h->ht;
write_lock_bh(&h->lock);
sk_add_node(sk, head);
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
write_unlock_bh(&h->lock);
return 0;
}
EXPORT_SYMBOL_GPL(smc_hash_sk);
void smc_unhash_sk(struct sock *sk)
{
struct smc_hashinfo *h = sk->sk_prot->h.smc_hash;
write_lock_bh(&h->lock);
if (sk_del_node_init(sk))
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
write_unlock_bh(&h->lock);
}
EXPORT_SYMBOL_GPL(smc_unhash_sk);
struct proto smc_proto = {
.name = "SMC",
.owner = THIS_MODULE,
.keepalive = smc_set_keepalive,
.hash = smc_hash_sk,
.unhash = smc_unhash_sk,
.obj_size = sizeof(struct smc_sock),
.h.smc_hash = &smc_v4_hashinfo,
.slab_flags = SLAB_TYPESAFE_BY_RCU,
};
EXPORT_SYMBOL_GPL(smc_proto);
struct proto smc_proto6 = {
.name = "SMC6",
.owner = THIS_MODULE,
.keepalive = smc_set_keepalive,
.hash = smc_hash_sk,
.unhash = smc_unhash_sk,
.obj_size = sizeof(struct smc_sock),
.h.smc_hash = &smc_v6_hashinfo,
.slab_flags = SLAB_TYPESAFE_BY_RCU,
};
EXPORT_SYMBOL_GPL(smc_proto6);
static void smc_restore_fallback_changes(struct smc_sock *smc)
{
if (smc->clcsock->file) { /* non-accepted sockets have no file yet */
smc->clcsock->file->private_data = smc->sk.sk_socket;
smc->clcsock->file = NULL;
}
}
static int __smc_release(struct smc_sock *smc)
{
struct sock *sk = &smc->sk;
int rc = 0;
if (!smc->use_fallback) {
rc = smc_close_active(smc);
sock_set_flag(sk, SOCK_DEAD);
sk->sk_shutdown |= SHUTDOWN_MASK;
} else {
if (sk->sk_state != SMC_CLOSED) {
if (sk->sk_state != SMC_LISTEN &&
sk->sk_state != SMC_INIT)
sock_put(sk); /* passive closing */
if (sk->sk_state == SMC_LISTEN) {
/* wake up clcsock accept */
rc = kernel_sock_shutdown(smc->clcsock,
SHUT_RDWR);
}
sk->sk_state = SMC_CLOSED;
sk->sk_state_change(sk);
}
smc_restore_fallback_changes(smc);
}
sk->sk_prot->unhash(sk);
if (sk->sk_state == SMC_CLOSED) {
if (smc->clcsock) {
release_sock(sk);
smc_clcsock_release(smc);
lock_sock(sk);
}
if (!smc->use_fallback)
smc_conn_free(&smc->conn);
}
return rc;
}
static int smc_release(struct socket *sock)
{
struct sock *sk = sock->sk;
struct smc_sock *smc;
int old_state, rc = 0;
if (!sk)
goto out;
sock_hold(sk); /* sock_put below */
smc = smc_sk(sk);
old_state = sk->sk_state;
/* cleanup for a dangling non-blocking connect */
if (smc->connect_nonblock && old_state == SMC_INIT)
tcp_abort(smc->clcsock->sk, ECONNABORTED);
if (cancel_work_sync(&smc->connect_work))
sock_put(&smc->sk); /* sock_hold in smc_connect for passive closing */
if (sk->sk_state == SMC_LISTEN)
/* smc_close_non_accepted() is called and acquires
* sock lock for child sockets again
*/
lock_sock_nested(sk, SINGLE_DEPTH_NESTING);
else
lock_sock(sk);
if (old_state == SMC_INIT && sk->sk_state == SMC_ACTIVE &&
!smc->use_fallback)
smc_close_active_abort(smc);
rc = __smc_release(smc);
/* detach socket */
sock_orphan(sk);
sock->sk = NULL;
release_sock(sk);
sock_put(sk); /* sock_hold above */
sock_put(sk); /* final sock_put */
out:
return rc;
}
static void smc_destruct(struct sock *sk)
{
if (sk->sk_state != SMC_CLOSED)
return;
if (!sock_flag(sk, SOCK_DEAD))
return;
sk_refcnt_debug_dec(sk);
}
static struct sock *smc_sock_alloc(struct net *net, struct socket *sock,
int protocol)
{
struct smc_sock *smc;
struct proto *prot;
struct sock *sk;
prot = (protocol == SMCPROTO_SMC6) ? &smc_proto6 : &smc_proto;
sk = sk_alloc(net, PF_SMC, GFP_KERNEL, prot, 0);
if (!sk)
return NULL;
sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
sk->sk_state = SMC_INIT;
sk->sk_destruct = smc_destruct;
sk->sk_protocol = protocol;
smc = smc_sk(sk);
INIT_WORK(&smc->tcp_listen_work, smc_tcp_listen_work);
INIT_WORK(&smc->connect_work, smc_connect_work);
INIT_DELAYED_WORK(&smc->conn.tx_work, smc_tx_work);
INIT_LIST_HEAD(&smc->accept_q);
spin_lock_init(&smc->accept_q_lock);
spin_lock_init(&smc->conn.send_lock);
sk->sk_prot->hash(sk);
sk_refcnt_debug_inc(sk);
mutex_init(&smc->clcsock_release_lock);
return sk;
}
static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
int addr_len)
{
struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
struct sock *sk = sock->sk;
struct smc_sock *smc;
int rc;
smc = smc_sk(sk);
/* replicate tests from inet_bind(), to be safe wrt. future changes */
rc = -EINVAL;
if (addr_len < sizeof(struct sockaddr_in))
goto out;
rc = -EAFNOSUPPORT;
if (addr->sin_family != AF_INET &&
addr->sin_family != AF_INET6 &&
addr->sin_family != AF_UNSPEC)
goto out;
/* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
if (addr->sin_family == AF_UNSPEC &&
addr->sin_addr.s_addr != htonl(INADDR_ANY))
goto out;
lock_sock(sk);
/* Check if socket is already active */
rc = -EINVAL;
if (sk->sk_state != SMC_INIT || smc->connect_nonblock)
goto out_rel;
smc->clcsock->sk->sk_reuse = sk->sk_reuse;
rc = kernel_bind(smc->clcsock, uaddr, addr_len);
out_rel:
release_sock(sk);
out:
return rc;
}
static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
unsigned long mask)
{
/* options we don't get control via setsockopt for */
nsk->sk_type = osk->sk_type;
nsk->sk_sndbuf = osk->sk_sndbuf;
nsk->sk_rcvbuf = osk->sk_rcvbuf;
nsk->sk_sndtimeo = osk->sk_sndtimeo;
nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
nsk->sk_mark = osk->sk_mark;
nsk->sk_priority = osk->sk_priority;
nsk->sk_rcvlowat = osk->sk_rcvlowat;
nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
nsk->sk_err = osk->sk_err;
nsk->sk_flags &= ~mask;
nsk->sk_flags |= osk->sk_flags & mask;
}
#define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
(1UL << SOCK_KEEPOPEN) | \
(1UL << SOCK_LINGER) | \
(1UL << SOCK_BROADCAST) | \
(1UL << SOCK_TIMESTAMP) | \
(1UL << SOCK_DBG) | \
(1UL << SOCK_RCVTSTAMP) | \
(1UL << SOCK_RCVTSTAMPNS) | \
(1UL << SOCK_LOCALROUTE) | \
(1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
(1UL << SOCK_RXQ_OVFL) | \
(1UL << SOCK_WIFI_STATUS) | \
(1UL << SOCK_NOFCS) | \
(1UL << SOCK_FILTER_LOCKED) | \
(1UL << SOCK_TSTAMP_NEW))
/* copy only relevant settings and flags of SOL_SOCKET level from smc to
* clc socket (since smc is not called for these options from net/core)
*/
static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
{
smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
}
#define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
(1UL << SOCK_KEEPOPEN) | \
(1UL << SOCK_LINGER) | \
(1UL << SOCK_DBG))
/* copy only settings and flags relevant for smc from clc to smc socket */
static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
{
smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
}
/* register the new rmb on all links */
static int smcr_lgr_reg_rmbs(struct smc_link *link,
struct smc_buf_desc *rmb_desc)
{
struct smc_link_group *lgr = link->lgr;
int i, rc = 0;
rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
if (rc)
return rc;
/* protect against parallel smc_llc_cli_rkey_exchange() and
* parallel smcr_link_reg_rmb()
*/
mutex_lock(&lgr->llc_conf_mutex);
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
if (!smc_link_active(&lgr->lnk[i]))
continue;
rc = smcr_link_reg_rmb(&lgr->lnk[i], rmb_desc);
if (rc)
goto out;
}
/* exchange confirm_rkey msg with peer */
rc = smc_llc_do_confirm_rkey(link, rmb_desc);
if (rc) {
rc = -EFAULT;
goto out;
}
rmb_desc->is_conf_rkey = true;
out:
mutex_unlock(&lgr->llc_conf_mutex);
smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
return rc;
}
static int smcr_clnt_conf_first_link(struct smc_sock *smc)
{
struct smc_link *link = smc->conn.lnk;
struct smc_llc_qentry *qentry;
int rc;
/* receive CONFIRM LINK request from server over RoCE fabric */
qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
SMC_LLC_CONFIRM_LINK);
if (!qentry) {
struct smc_clc_msg_decline dclc;
rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
return rc == -EAGAIN ? SMC_CLC_DECL_TIMEOUT_CL : rc;
}
smc_llc_save_peer_uid(qentry);
rc = smc_llc_eval_conf_link(qentry, SMC_LLC_REQ);
smc_llc_flow_qentry_del(&link->lgr->llc_flow_lcl);
if (rc)
return SMC_CLC_DECL_RMBE_EC;
rc = smc_ib_modify_qp_rts(link);
if (rc)
return SMC_CLC_DECL_ERR_RDYLNK;
smc_wr_remember_qp_attr(link);
if (smcr_link_reg_rmb(link, smc->conn.rmb_desc))
return SMC_CLC_DECL_ERR_REGRMB;
/* confirm_rkey is implicit on 1st contact */
smc->conn.rmb_desc->is_conf_rkey = true;
/* send CONFIRM LINK response over RoCE fabric */
rc = smc_llc_send_confirm_link(link, SMC_LLC_RESP);
if (rc < 0)
return SMC_CLC_DECL_TIMEOUT_CL;
smc_llc_link_active(link);
smcr_lgr_set_type(link->lgr, SMC_LGR_SINGLE);
/* optional 2nd link, receive ADD LINK request from server */
qentry = smc_llc_wait(link->lgr, NULL, SMC_LLC_WAIT_TIME,
SMC_LLC_ADD_LINK);
if (!qentry) {
struct smc_clc_msg_decline dclc;
rc = smc_clc_wait_msg(smc, &dclc, sizeof(dclc),
SMC_CLC_DECLINE, CLC_WAIT_TIME_SHORT);
if (rc == -EAGAIN)
rc = 0; /* no DECLINE received, go with one link */
return rc;
}
smc_llc_flow_qentry_clr(&link->lgr->llc_flow_lcl);
smc_llc_cli_add_link(link, qentry);
return 0;
}
static void smcr_conn_save_peer_info(struct smc_sock *smc,
struct smc_clc_msg_accept_confirm *clc)
{
int bufsize = smc_uncompress_bufsize(clc->r0.rmbe_size);
smc->conn.peer_rmbe_idx = clc->r0.rmbe_idx;
smc->conn.local_tx_ctrl.token = ntohl(clc->r0.rmbe_alert_token);
smc->conn.peer_rmbe_size = bufsize;
atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
smc->conn.tx_off = bufsize * (smc->conn.peer_rmbe_idx - 1);
}
static bool smc_isascii(char *hostname)
{
int i;
for (i = 0; i < SMC_MAX_HOSTNAME_LEN; i++)
if (!isascii(hostname[i]))
return false;
return true;
}
static void smcd_conn_save_peer_info(struct smc_sock *smc,
struct smc_clc_msg_accept_confirm *clc)
{
int bufsize = smc_uncompress_bufsize(clc->d0.dmbe_size);
smc->conn.peer_rmbe_idx = clc->d0.dmbe_idx;
smc->conn.peer_token = clc->d0.token;
/* msg header takes up space in the buffer */
smc->conn.peer_rmbe_size = bufsize - sizeof(struct smcd_cdc_msg);
atomic_set(&smc->conn.peer_rmbe_space, smc->conn.peer_rmbe_size);
smc->conn.tx_off = bufsize * smc->conn.peer_rmbe_idx;
if (clc->hdr.version > SMC_V1 &&
(clc->hdr.typev2 & SMC_FIRST_CONTACT_MASK)) {
struct smc_clc_msg_accept_confirm_v2 *clc_v2 =
(struct smc_clc_msg_accept_confirm_v2 *)clc;
struct smc_clc_first_contact_ext *fce =
(struct smc_clc_first_contact_ext *)
(((u8 *)clc_v2) + sizeof(*clc_v2));
memcpy(smc->conn.lgr->negotiated_eid, clc_v2->eid,
SMC_MAX_EID_LEN);
smc->conn.lgr->peer_os = fce->os_type;
smc->conn.lgr->peer_smc_release = fce->release;
if (smc_isascii(fce->hostname))
memcpy(smc->conn.lgr->peer_hostname, fce->hostname,
SMC_MAX_HOSTNAME_LEN);
}
}
static void smc_conn_save_peer_info(struct smc_sock *smc,
struct smc_clc_msg_accept_confirm *clc)
{
if (smc->conn.lgr->is_smcd)
smcd_conn_save_peer_info(smc, clc);
else
smcr_conn_save_peer_info(smc, clc);
}
static void smc_link_save_peer_info(struct smc_link *link,
struct smc_clc_msg_accept_confirm *clc)
{
link->peer_qpn = ntoh24(clc->r0.qpn);
memcpy(link->peer_gid, clc->r0.lcl.gid, SMC_GID_SIZE);
memcpy(link->peer_mac, clc->r0.lcl.mac, sizeof(link->peer_mac));
link->peer_psn = ntoh24(clc->r0.psn);
link->peer_mtu = clc->r0.qp_mtu;
}
static void smc_stat_inc_fback_rsn_cnt(struct smc_sock *smc,
struct smc_stats_fback *fback_arr)
{
int cnt;
for (cnt = 0; cnt < SMC_MAX_FBACK_RSN_CNT; cnt++) {
if (fback_arr[cnt].fback_code == smc->fallback_rsn) {
fback_arr[cnt].count++;
break;
}
if (!fback_arr[cnt].fback_code) {
fback_arr[cnt].fback_code = smc->fallback_rsn;
fback_arr[cnt].count++;
break;
}
}
}
static void smc_stat_fallback(struct smc_sock *smc)
{
struct net *net = sock_net(&smc->sk);
mutex_lock(&net->smc.mutex_fback_rsn);
if (smc->listen_smc) {
smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->srv);
net->smc.fback_rsn->srv_fback_cnt++;
} else {
smc_stat_inc_fback_rsn_cnt(smc, net->smc.fback_rsn->clnt);
net->smc.fback_rsn->clnt_fback_cnt++;
}
mutex_unlock(&net->smc.mutex_fback_rsn);
}
/* must be called under rcu read lock */
static void smc_fback_wakeup_waitqueue(struct smc_sock *smc, void *key)
{
struct socket_wq *wq;
__poll_t flags;
wq = rcu_dereference(smc->sk.sk_wq);
if (!skwq_has_sleeper(wq))
return;
/* wake up smc sk->sk_wq */
if (!key) {
/* sk_state_change */
wake_up_interruptible_all(&wq->wait);
} else {
flags = key_to_poll(key);
if (flags & (EPOLLIN | EPOLLOUT))
/* sk_data_ready or sk_write_space */
wake_up_interruptible_sync_poll(&wq->wait, flags);
else if (flags & EPOLLERR)
/* sk_error_report */
wake_up_interruptible_poll(&wq->wait, flags);
}
}
static int smc_fback_mark_woken(wait_queue_entry_t *wait,
unsigned int mode, int sync, void *key)
{
struct smc_mark_woken *mark =
container_of(wait, struct smc_mark_woken, wait_entry);
mark->woken = true;
mark->key = key;
return 0;
}
static void smc_fback_forward_wakeup(struct smc_sock *smc, struct sock *clcsk,
void (*clcsock_callback)(struct sock *sk))
{
struct smc_mark_woken mark = { .woken = false };
struct socket_wq *wq;
init_waitqueue_func_entry(&mark.wait_entry,
smc_fback_mark_woken);
rcu_read_lock();
wq = rcu_dereference(clcsk->sk_wq);
if (!wq)
goto out;
add_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
clcsock_callback(clcsk);
remove_wait_queue(sk_sleep(clcsk), &mark.wait_entry);
if (mark.woken)
smc_fback_wakeup_waitqueue(smc, mark.key);
out:
rcu_read_unlock();
}
static void smc_fback_state_change(struct sock *clcsk)
{
struct smc_sock *smc =
smc_clcsock_user_data(clcsk);
if (!smc)
return;
smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_state_change);
}
static void smc_fback_data_ready(struct sock *clcsk)
{
struct smc_sock *smc =
smc_clcsock_user_data(clcsk);
if (!smc)
return;
smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_data_ready);
}
static void smc_fback_write_space(struct sock *clcsk)
{
struct smc_sock *smc =
smc_clcsock_user_data(clcsk);
if (!smc)
return;
smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_write_space);
}
static void smc_fback_error_report(struct sock *clcsk)
{
struct smc_sock *smc =
smc_clcsock_user_data(clcsk);
if (!smc)
return;
smc_fback_forward_wakeup(smc, clcsk, smc->clcsk_error_report);
}
static int smc_switch_to_fallback(struct smc_sock *smc, int reason_code)
{
struct sock *clcsk;
int rc = 0;
mutex_lock(&smc->clcsock_release_lock);
if (!smc->clcsock) {
rc = -EBADF;
goto out;
}
clcsk = smc->clcsock->sk;
if (smc->use_fallback)
goto out;
smc->use_fallback = true;
smc->fallback_rsn = reason_code;
smc_stat_fallback(smc);
if (smc->sk.sk_socket && smc->sk.sk_socket->file) {
smc->clcsock->file = smc->sk.sk_socket->file;
smc->clcsock->file->private_data = smc->clcsock;
smc->clcsock->wq.fasync_list =
smc->sk.sk_socket->wq.fasync_list;
/* There might be some wait entries remaining
* in smc sk->sk_wq and they should be woken up
* as clcsock's wait queue is woken up.
*/
smc->clcsk_state_change = clcsk->sk_state_change;
smc->clcsk_data_ready = clcsk->sk_data_ready;
smc->clcsk_write_space = clcsk->sk_write_space;
smc->clcsk_error_report = clcsk->sk_error_report;
clcsk->sk_state_change = smc_fback_state_change;
clcsk->sk_data_ready = smc_fback_data_ready;
clcsk->sk_write_space = smc_fback_write_space;
clcsk->sk_error_report = smc_fback_error_report;
smc->clcsock->sk->sk_user_data =
(void *)((uintptr_t)smc | SK_USER_DATA_NOCOPY);
}
out:
mutex_unlock(&smc->clcsock_release_lock);
return rc;
}
/* fall back during connect */
static int smc_connect_fallback(struct smc_sock *smc, int reason_code)
{
struct net *net = sock_net(&smc->sk);
int rc = 0;
rc = smc_switch_to_fallback(smc, reason_code);
if (rc) { /* fallback fails */
this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
if (smc->sk.sk_state == SMC_INIT)
sock_put(&smc->sk); /* passive closing */
return rc;
}
smc_copy_sock_settings_to_clc(smc);
smc->connect_nonblock = 0;
if (smc->sk.sk_state == SMC_INIT)
smc->sk.sk_state = SMC_ACTIVE;
return 0;
}
/* decline and fall back during connect */
static int smc_connect_decline_fallback(struct smc_sock *smc, int reason_code,
u8 version)
{
struct net *net = sock_net(&smc->sk);
int rc;
if (reason_code < 0) { /* error, fallback is not possible */
this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
if (smc->sk.sk_state == SMC_INIT)
sock_put(&smc->sk); /* passive closing */
return reason_code;
}
if (reason_code != SMC_CLC_DECL_PEERDECL) {
rc = smc_clc_send_decline(smc, reason_code, version);
if (rc < 0) {
this_cpu_inc(net->smc.smc_stats->clnt_hshake_err_cnt);
if (smc->sk.sk_state == SMC_INIT)
sock_put(&smc->sk); /* passive closing */
return rc;
}
}
return smc_connect_fallback(smc, reason_code);
}
static void smc_conn_abort(struct smc_sock *smc, int local_first)
{
struct smc_connection *conn = &smc->conn;
struct smc_link_group *lgr = conn->lgr;
smc_conn_free(conn);
if (local_first)
smc_lgr_cleanup_early(lgr);
}
/* check if there is a rdma device available for this connection. */
/* called for connect and listen */
static int smc_find_rdma_device(struct smc_sock *smc, struct smc_init_info *ini)
{
/* PNET table look up: search active ib_device and port
* within same PNETID that also contains the ethernet device
* used for the internal TCP socket
*/
smc_pnet_find_roce_resource(smc->clcsock->sk, ini);
if (!ini->ib_dev)
return SMC_CLC_DECL_NOSMCRDEV;
return 0;
}
/* check if there is an ISM device available for this connection. */
/* called for connect and listen */
static int smc_find_ism_device(struct smc_sock *smc, struct smc_init_info *ini)
{
/* Find ISM device with same PNETID as connecting interface */
smc_pnet_find_ism_resource(smc->clcsock->sk, ini);
if (!ini->ism_dev[0])
return SMC_CLC_DECL_NOSMCDDEV;
else
ini->ism_chid[0] = smc_ism_get_chid(ini->ism_dev[0]);
return 0;
}
/* is chid unique for the ism devices that are already determined? */
static bool smc_find_ism_v2_is_unique_chid(u16 chid, struct smc_init_info *ini,
int cnt)
{
int i = (!ini->ism_dev[0]) ? 1 : 0;
for (; i < cnt; i++)
if (ini->ism_chid[i] == chid)
return false;
return true;
}
/* determine possible V2 ISM devices (either without PNETID or with PNETID plus
* PNETID matching net_device)
*/
static int smc_find_ism_v2_device_clnt(struct smc_sock *smc,
struct smc_init_info *ini)
{
int rc = SMC_CLC_DECL_NOSMCDDEV;
struct smcd_dev *smcd;
int i = 1;
u16 chid;
if (smcd_indicated(ini->smc_type_v1))
rc = 0; /* already initialized for V1 */
mutex_lock(&smcd_dev_list.mutex);
list_for_each_entry(smcd, &smcd_dev_list.list, list) {
if (smcd->going_away || smcd == ini->ism_dev[0])
continue;
chid = smc_ism_get_chid(smcd);
if (!smc_find_ism_v2_is_unique_chid(chid, ini, i))
continue;
if (!smc_pnet_is_pnetid_set(smcd->pnetid) ||
smc_pnet_is_ndev_pnetid(sock_net(&smc->sk), smcd->pnetid)) {
ini->ism_dev[i] = smcd;
ini->ism_chid[i] = chid;
ini->is_smcd = true;
rc = 0;
i++;
if (i > SMC_MAX_ISM_DEVS)
break;
}
}
mutex_unlock(&smcd_dev_list.mutex);
ini->ism_offered_cnt = i - 1;
if (!ini->ism_dev[0] && !ini->ism_dev[1])
ini->smcd_version = 0;
return rc;
}
/* Check for VLAN ID and register it on ISM device just for CLC handshake */
static int smc_connect_ism_vlan_setup(struct smc_sock *smc,
struct smc_init_info *ini)
{
if (ini->vlan_id && smc_ism_get_vlan(ini->ism_dev[0], ini->vlan_id))
return SMC_CLC_DECL_ISMVLANERR;
return 0;
}
static int smc_find_proposal_devices(struct smc_sock *smc,
struct smc_init_info *ini)
{
int rc = 0;
/* check if there is an ism device available */
if (ini->smcd_version & SMC_V1) {
if (smc_find_ism_device(smc, ini) ||
smc_connect_ism_vlan_setup(smc, ini)) {
if (ini->smc_type_v1 == SMC_TYPE_B)
ini->smc_type_v1 = SMC_TYPE_R;
else
ini->smc_type_v1 = SMC_TYPE_N;
} /* else ISM V1 is supported for this connection */
if (smc_find_rdma_device(smc, ini)) {
if (ini->smc_type_v1 == SMC_TYPE_B)
ini->smc_type_v1 = SMC_TYPE_D;
else
ini->smc_type_v1 = SMC_TYPE_N;
} /* else RDMA is supported for this connection */
}
if (smc_ism_is_v2_capable() && smc_find_ism_v2_device_clnt(smc, ini))
ini->smc_type_v2 = SMC_TYPE_N;
/* if neither ISM nor RDMA are supported, fallback */
if (!smcr_indicated(ini->smc_type_v1) &&
ini->smc_type_v1 == SMC_TYPE_N && ini->smc_type_v2 == SMC_TYPE_N)
rc = SMC_CLC_DECL_NOSMCDEV;
return rc;
}
/* cleanup temporary VLAN ID registration used for CLC handshake. If ISM is
* used, the VLAN ID will be registered again during the connection setup.
*/
static int smc_connect_ism_vlan_cleanup(struct smc_sock *smc,
struct smc_init_info *ini)
{
if (!smcd_indicated(ini->smc_type_v1))
return 0;
if (ini->vlan_id && smc_ism_put_vlan(ini->ism_dev[0], ini->vlan_id))
return SMC_CLC_DECL_CNFERR;
return 0;
}
#define SMC_CLC_MAX_ACCEPT_LEN \
(sizeof(struct smc_clc_msg_accept_confirm_v2) + \
sizeof(struct smc_clc_first_contact_ext) + \
sizeof(struct smc_clc_msg_trail))
/* CLC handshake during connect */
static int smc_connect_clc(struct smc_sock *smc,
struct smc_clc_msg_accept_confirm_v2 *aclc2,
struct smc_init_info *ini)
{
int rc = 0;
/* do inband token exchange */
rc = smc_clc_send_proposal(smc, ini);
if (rc)
return rc;
/* receive SMC Accept CLC message */
return smc_clc_wait_msg(smc, aclc2, SMC_CLC_MAX_ACCEPT_LEN,
SMC_CLC_ACCEPT, CLC_WAIT_TIME);
}
/* setup for RDMA connection of client */
static int smc_connect_rdma(struct smc_sock *smc,
struct smc_clc_msg_accept_confirm *aclc,
struct smc_init_info *ini)
{
int i, reason_code = 0;
struct smc_link *link;
ini->is_smcd = false;
ini->ib_lcl = &aclc->r0.lcl;
ini->ib_clcqpn = ntoh24(aclc->r0.qpn);
ini->first_contact_peer = aclc->hdr.typev2 & SMC_FIRST_CONTACT_MASK;
mutex_lock(&smc_client_lgr_pending);
reason_code = smc_conn_create(smc, ini);
if (reason_code) {
mutex_unlock(&smc_client_lgr_pending);
return reason_code;
}
smc_conn_save_peer_info(smc, aclc);
if (ini->first_contact_local) {
link = smc->conn.lnk;
} else {
/* set link that was assigned by server */
link = NULL;
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
struct smc_link *l = &smc->conn.lgr->lnk[i];
if (l->peer_qpn == ntoh24(aclc->r0.qpn) &&
!memcmp(l->peer_gid, &aclc->r0.lcl.gid,
SMC_GID_SIZE) &&
!memcmp(l->peer_mac, &aclc->r0.lcl.mac,
sizeof(l->peer_mac))) {
link = l;
break;
}
}
if (!link) {
reason_code = SMC_CLC_DECL_NOSRVLINK;
goto connect_abort;
}
smc_switch_link_and_count(&smc->conn, link);
}
/* create send buffer and rmb */
if (smc_buf_create(smc, false)) {
reason_code = SMC_CLC_DECL_MEM;
goto connect_abort;
}
if (ini->first_contact_local)
smc_link_save_peer_info(link, aclc);
if (smc_rmb_rtoken_handling(&smc->conn, link, aclc)) {
reason_code = SMC_CLC_DECL_ERR_RTOK;
goto connect_abort;
}
smc_close_init(smc);
smc_rx_init(smc);
if (ini->first_contact_local) {
if (smc_ib_ready_link(link)) {
reason_code = SMC_CLC_DECL_ERR_RDYLNK;
goto connect_abort;
}
} else {
if (smcr_lgr_reg_rmbs(link, smc->conn.rmb_desc)) {
reason_code = SMC_CLC_DECL_ERR_REGRMB;
goto connect_abort;
}
}
smc_rmb_sync_sg_for_device(&smc->conn);
reason_code = smc_clc_send_confirm(smc, ini->first_contact_local,
SMC_V1);
if (reason_code)
goto connect_abort;
smc_tx_init(smc);
if (ini->first_contact_local) {
/* QP confirmation over RoCE fabric */
smc_llc_flow_initiate(link->lgr, SMC_LLC_FLOW_ADD_LINK);
reason_code = smcr_clnt_conf_first_link(smc);
smc_llc_flow_stop(link->lgr, &link->lgr->llc_flow_lcl);
if (reason_code)
goto connect_abort;
}
mutex_unlock(&smc_client_lgr_pending);