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smc_core.c
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// SPDX-License-Identifier: GPL-2.0
/*
* Shared Memory Communications over RDMA (SMC-R) and RoCE
*
* Basic Transport Functions exploiting Infiniband API
*
* Copyright IBM Corp. 2016
*
* Author(s): Ursula Braun <[email protected]>
*/
#include <linux/socket.h>
#include <linux/if_vlan.h>
#include <linux/random.h>
#include <linux/workqueue.h>
#include <linux/wait.h>
#include <linux/reboot.h>
#include <linux/mutex.h>
#include <linux/list.h>
#include <linux/smc.h>
#include <net/tcp.h>
#include <net/sock.h>
#include <rdma/ib_verbs.h>
#include <rdma/ib_cache.h>
#include "smc.h"
#include "smc_clc.h"
#include "smc_core.h"
#include "smc_ib.h"
#include "smc_wr.h"
#include "smc_llc.h"
#include "smc_cdc.h"
#include "smc_close.h"
#include "smc_ism.h"
#include "smc_netlink.h"
#define SMC_LGR_NUM_INCR 256
#define SMC_LGR_FREE_DELAY_SERV (600 * HZ)
#define SMC_LGR_FREE_DELAY_CLNT (SMC_LGR_FREE_DELAY_SERV + 10 * HZ)
struct smc_lgr_list smc_lgr_list = { /* established link groups */
.lock = __SPIN_LOCK_UNLOCKED(smc_lgr_list.lock),
.list = LIST_HEAD_INIT(smc_lgr_list.list),
.num = 0,
};
static atomic_t lgr_cnt = ATOMIC_INIT(0); /* number of existing link groups */
static DECLARE_WAIT_QUEUE_HEAD(lgrs_deleted);
static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
struct smc_buf_desc *buf_desc);
static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft);
static void smc_link_down_work(struct work_struct *work);
/* return head of link group list and its lock for a given link group */
static inline struct list_head *smc_lgr_list_head(struct smc_link_group *lgr,
spinlock_t **lgr_lock)
{
if (lgr->is_smcd) {
*lgr_lock = &lgr->smcd->lgr_lock;
return &lgr->smcd->lgr_list;
}
*lgr_lock = &smc_lgr_list.lock;
return &smc_lgr_list.list;
}
static void smc_ibdev_cnt_inc(struct smc_link *lnk)
{
atomic_inc(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]);
}
static void smc_ibdev_cnt_dec(struct smc_link *lnk)
{
atomic_dec(&lnk->smcibdev->lnk_cnt_by_port[lnk->ibport - 1]);
}
static void smc_lgr_schedule_free_work(struct smc_link_group *lgr)
{
/* client link group creation always follows the server link group
* creation. For client use a somewhat higher removal delay time,
* otherwise there is a risk of out-of-sync link groups.
*/
if (!lgr->freeing) {
mod_delayed_work(system_wq, &lgr->free_work,
(!lgr->is_smcd && lgr->role == SMC_CLNT) ?
SMC_LGR_FREE_DELAY_CLNT :
SMC_LGR_FREE_DELAY_SERV);
}
}
/* Register connection's alert token in our lookup structure.
* To use rbtrees we have to implement our own insert core.
* Requires @conns_lock
* @smc connection to register
* Returns 0 on success, != otherwise.
*/
static void smc_lgr_add_alert_token(struct smc_connection *conn)
{
struct rb_node **link, *parent = NULL;
u32 token = conn->alert_token_local;
link = &conn->lgr->conns_all.rb_node;
while (*link) {
struct smc_connection *cur = rb_entry(*link,
struct smc_connection, alert_node);
parent = *link;
if (cur->alert_token_local > token)
link = &parent->rb_left;
else
link = &parent->rb_right;
}
/* Put the new node there */
rb_link_node(&conn->alert_node, parent, link);
rb_insert_color(&conn->alert_node, &conn->lgr->conns_all);
}
/* assign an SMC-R link to the connection */
static int smcr_lgr_conn_assign_link(struct smc_connection *conn, bool first)
{
enum smc_link_state expected = first ? SMC_LNK_ACTIVATING :
SMC_LNK_ACTIVE;
int i, j;
/* do link balancing */
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
struct smc_link *lnk = &conn->lgr->lnk[i];
if (lnk->state != expected || lnk->link_is_asym)
continue;
if (conn->lgr->role == SMC_CLNT) {
conn->lnk = lnk; /* temporary, SMC server assigns link*/
break;
}
if (conn->lgr->conns_num % 2) {
for (j = i + 1; j < SMC_LINKS_PER_LGR_MAX; j++) {
struct smc_link *lnk2;
lnk2 = &conn->lgr->lnk[j];
if (lnk2->state == expected &&
!lnk2->link_is_asym) {
conn->lnk = lnk2;
break;
}
}
}
if (!conn->lnk)
conn->lnk = lnk;
break;
}
if (!conn->lnk)
return SMC_CLC_DECL_NOACTLINK;
atomic_inc(&conn->lnk->conn_cnt);
return 0;
}
/* Register connection in link group by assigning an alert token
* registered in a search tree.
* Requires @conns_lock
* Note that '0' is a reserved value and not assigned.
*/
static int smc_lgr_register_conn(struct smc_connection *conn, bool first)
{
struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
static atomic_t nexttoken = ATOMIC_INIT(0);
int rc;
if (!conn->lgr->is_smcd) {
rc = smcr_lgr_conn_assign_link(conn, first);
if (rc)
return rc;
}
/* find a new alert_token_local value not yet used by some connection
* in this link group
*/
sock_hold(&smc->sk); /* sock_put in smc_lgr_unregister_conn() */
while (!conn->alert_token_local) {
conn->alert_token_local = atomic_inc_return(&nexttoken);
if (smc_lgr_find_conn(conn->alert_token_local, conn->lgr))
conn->alert_token_local = 0;
}
smc_lgr_add_alert_token(conn);
conn->lgr->conns_num++;
return 0;
}
/* Unregister connection and reset the alert token of the given connection<
*/
static void __smc_lgr_unregister_conn(struct smc_connection *conn)
{
struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
struct smc_link_group *lgr = conn->lgr;
rb_erase(&conn->alert_node, &lgr->conns_all);
if (conn->lnk)
atomic_dec(&conn->lnk->conn_cnt);
lgr->conns_num--;
conn->alert_token_local = 0;
sock_put(&smc->sk); /* sock_hold in smc_lgr_register_conn() */
}
/* Unregister connection from lgr
*/
static void smc_lgr_unregister_conn(struct smc_connection *conn)
{
struct smc_link_group *lgr = conn->lgr;
if (!lgr)
return;
write_lock_bh(&lgr->conns_lock);
if (conn->alert_token_local) {
__smc_lgr_unregister_conn(conn);
}
write_unlock_bh(&lgr->conns_lock);
conn->lgr = NULL;
}
int smc_nl_get_sys_info(struct sk_buff *skb, struct netlink_callback *cb)
{
struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
char hostname[SMC_MAX_HOSTNAME_LEN + 1];
char smc_seid[SMC_MAX_EID_LEN + 1];
struct smcd_dev *smcd_dev;
struct nlattr *attrs;
u8 *seid = NULL;
u8 *host = NULL;
void *nlh;
nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
&smc_gen_nl_family, NLM_F_MULTI,
SMC_NETLINK_GET_SYS_INFO);
if (!nlh)
goto errmsg;
if (cb_ctx->pos[0])
goto errout;
attrs = nla_nest_start(skb, SMC_GEN_SYS_INFO);
if (!attrs)
goto errout;
if (nla_put_u8(skb, SMC_NLA_SYS_VER, SMC_V2))
goto errattr;
if (nla_put_u8(skb, SMC_NLA_SYS_REL, SMC_RELEASE))
goto errattr;
if (nla_put_u8(skb, SMC_NLA_SYS_IS_ISM_V2, smc_ism_is_v2_capable()))
goto errattr;
smc_clc_get_hostname(&host);
if (host) {
memcpy(hostname, host, SMC_MAX_HOSTNAME_LEN);
hostname[SMC_MAX_HOSTNAME_LEN] = 0;
if (nla_put_string(skb, SMC_NLA_SYS_LOCAL_HOST, hostname))
goto errattr;
}
mutex_lock(&smcd_dev_list.mutex);
smcd_dev = list_first_entry_or_null(&smcd_dev_list.list,
struct smcd_dev, list);
if (smcd_dev)
smc_ism_get_system_eid(smcd_dev, &seid);
mutex_unlock(&smcd_dev_list.mutex);
if (seid && smc_ism_is_v2_capable()) {
memcpy(smc_seid, seid, SMC_MAX_EID_LEN);
smc_seid[SMC_MAX_EID_LEN] = 0;
if (nla_put_string(skb, SMC_NLA_SYS_SEID, smc_seid))
goto errattr;
}
nla_nest_end(skb, attrs);
genlmsg_end(skb, nlh);
cb_ctx->pos[0] = 1;
return skb->len;
errattr:
nla_nest_cancel(skb, attrs);
errout:
genlmsg_cancel(skb, nlh);
errmsg:
return skb->len;
}
static int smc_nl_fill_lgr(struct smc_link_group *lgr,
struct sk_buff *skb,
struct netlink_callback *cb)
{
char smc_target[SMC_MAX_PNETID_LEN + 1];
struct nlattr *attrs;
attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCR);
if (!attrs)
goto errout;
if (nla_put_u32(skb, SMC_NLA_LGR_R_ID, *((u32 *)&lgr->id)))
goto errattr;
if (nla_put_u32(skb, SMC_NLA_LGR_R_CONNS_NUM, lgr->conns_num))
goto errattr;
if (nla_put_u8(skb, SMC_NLA_LGR_R_ROLE, lgr->role))
goto errattr;
if (nla_put_u8(skb, SMC_NLA_LGR_R_TYPE, lgr->type))
goto errattr;
if (nla_put_u8(skb, SMC_NLA_LGR_R_VLAN_ID, lgr->vlan_id))
goto errattr;
memcpy(smc_target, lgr->pnet_id, SMC_MAX_PNETID_LEN);
smc_target[SMC_MAX_PNETID_LEN] = 0;
if (nla_put_string(skb, SMC_NLA_LGR_R_PNETID, smc_target))
goto errattr;
nla_nest_end(skb, attrs);
return 0;
errattr:
nla_nest_cancel(skb, attrs);
errout:
return -EMSGSIZE;
}
static int smc_nl_fill_lgr_link(struct smc_link_group *lgr,
struct smc_link *link,
struct sk_buff *skb,
struct netlink_callback *cb)
{
char smc_ibname[IB_DEVICE_NAME_MAX];
u8 smc_gid_target[41];
struct nlattr *attrs;
u32 link_uid = 0;
void *nlh;
nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
&smc_gen_nl_family, NLM_F_MULTI,
SMC_NETLINK_GET_LINK_SMCR);
if (!nlh)
goto errmsg;
attrs = nla_nest_start(skb, SMC_GEN_LINK_SMCR);
if (!attrs)
goto errout;
if (nla_put_u8(skb, SMC_NLA_LINK_ID, link->link_id))
goto errattr;
if (nla_put_u32(skb, SMC_NLA_LINK_STATE, link->state))
goto errattr;
if (nla_put_u32(skb, SMC_NLA_LINK_CONN_CNT,
atomic_read(&link->conn_cnt)))
goto errattr;
if (nla_put_u8(skb, SMC_NLA_LINK_IB_PORT, link->ibport))
goto errattr;
if (nla_put_u32(skb, SMC_NLA_LINK_NET_DEV, link->ndev_ifidx))
goto errattr;
snprintf(smc_ibname, sizeof(smc_ibname), "%s", link->ibname);
if (nla_put_string(skb, SMC_NLA_LINK_IB_DEV, smc_ibname))
goto errattr;
memcpy(&link_uid, link->link_uid, sizeof(link_uid));
if (nla_put_u32(skb, SMC_NLA_LINK_UID, link_uid))
goto errattr;
memcpy(&link_uid, link->peer_link_uid, sizeof(link_uid));
if (nla_put_u32(skb, SMC_NLA_LINK_PEER_UID, link_uid))
goto errattr;
memset(smc_gid_target, 0, sizeof(smc_gid_target));
smc_gid_be16_convert(smc_gid_target, link->gid);
if (nla_put_string(skb, SMC_NLA_LINK_GID, smc_gid_target))
goto errattr;
memset(smc_gid_target, 0, sizeof(smc_gid_target));
smc_gid_be16_convert(smc_gid_target, link->peer_gid);
if (nla_put_string(skb, SMC_NLA_LINK_PEER_GID, smc_gid_target))
goto errattr;
nla_nest_end(skb, attrs);
genlmsg_end(skb, nlh);
return 0;
errattr:
nla_nest_cancel(skb, attrs);
errout:
genlmsg_cancel(skb, nlh);
errmsg:
return -EMSGSIZE;
}
static int smc_nl_handle_lgr(struct smc_link_group *lgr,
struct sk_buff *skb,
struct netlink_callback *cb,
bool list_links)
{
void *nlh;
int i;
nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
&smc_gen_nl_family, NLM_F_MULTI,
SMC_NETLINK_GET_LGR_SMCR);
if (!nlh)
goto errmsg;
if (smc_nl_fill_lgr(lgr, skb, cb))
goto errout;
genlmsg_end(skb, nlh);
if (!list_links)
goto out;
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
if (!smc_link_usable(&lgr->lnk[i]))
continue;
if (smc_nl_fill_lgr_link(lgr, &lgr->lnk[i], skb, cb))
goto errout;
}
out:
return 0;
errout:
genlmsg_cancel(skb, nlh);
errmsg:
return -EMSGSIZE;
}
static void smc_nl_fill_lgr_list(struct smc_lgr_list *smc_lgr,
struct sk_buff *skb,
struct netlink_callback *cb,
bool list_links)
{
struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
struct smc_link_group *lgr;
int snum = cb_ctx->pos[0];
int num = 0;
spin_lock_bh(&smc_lgr->lock);
list_for_each_entry(lgr, &smc_lgr->list, list) {
if (num < snum)
goto next;
if (smc_nl_handle_lgr(lgr, skb, cb, list_links))
goto errout;
next:
num++;
}
errout:
spin_unlock_bh(&smc_lgr->lock);
cb_ctx->pos[0] = num;
}
static int smc_nl_fill_smcd_lgr(struct smc_link_group *lgr,
struct sk_buff *skb,
struct netlink_callback *cb)
{
char smc_host[SMC_MAX_HOSTNAME_LEN + 1];
char smc_pnet[SMC_MAX_PNETID_LEN + 1];
char smc_eid[SMC_MAX_EID_LEN + 1];
struct nlattr *v2_attrs;
struct nlattr *attrs;
void *nlh;
nlh = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
&smc_gen_nl_family, NLM_F_MULTI,
SMC_NETLINK_GET_LGR_SMCD);
if (!nlh)
goto errmsg;
attrs = nla_nest_start(skb, SMC_GEN_LGR_SMCD);
if (!attrs)
goto errout;
if (nla_put_u32(skb, SMC_NLA_LGR_D_ID, *((u32 *)&lgr->id)))
goto errattr;
if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_GID, lgr->smcd->local_gid,
SMC_NLA_LGR_D_PAD))
goto errattr;
if (nla_put_u64_64bit(skb, SMC_NLA_LGR_D_PEER_GID, lgr->peer_gid,
SMC_NLA_LGR_D_PAD))
goto errattr;
if (nla_put_u8(skb, SMC_NLA_LGR_D_VLAN_ID, lgr->vlan_id))
goto errattr;
if (nla_put_u32(skb, SMC_NLA_LGR_D_CONNS_NUM, lgr->conns_num))
goto errattr;
if (nla_put_u32(skb, SMC_NLA_LGR_D_CHID, smc_ism_get_chid(lgr->smcd)))
goto errattr;
memcpy(smc_pnet, lgr->smcd->pnetid, SMC_MAX_PNETID_LEN);
smc_pnet[SMC_MAX_PNETID_LEN] = 0;
if (nla_put_string(skb, SMC_NLA_LGR_D_PNETID, smc_pnet))
goto errattr;
v2_attrs = nla_nest_start(skb, SMC_NLA_LGR_V2);
if (!v2_attrs)
goto errattr;
if (nla_put_u8(skb, SMC_NLA_LGR_V2_VER, lgr->smc_version))
goto errv2attr;
if (nla_put_u8(skb, SMC_NLA_LGR_V2_REL, lgr->peer_smc_release))
goto errv2attr;
if (nla_put_u8(skb, SMC_NLA_LGR_V2_OS, lgr->peer_os))
goto errv2attr;
memcpy(smc_host, lgr->peer_hostname, SMC_MAX_HOSTNAME_LEN);
smc_host[SMC_MAX_HOSTNAME_LEN] = 0;
if (nla_put_string(skb, SMC_NLA_LGR_V2_PEER_HOST, smc_host))
goto errv2attr;
memcpy(smc_eid, lgr->negotiated_eid, SMC_MAX_EID_LEN);
smc_eid[SMC_MAX_EID_LEN] = 0;
if (nla_put_string(skb, SMC_NLA_LGR_V2_NEG_EID, smc_eid))
goto errv2attr;
nla_nest_end(skb, v2_attrs);
nla_nest_end(skb, attrs);
genlmsg_end(skb, nlh);
return 0;
errv2attr:
nla_nest_cancel(skb, v2_attrs);
errattr:
nla_nest_cancel(skb, attrs);
errout:
genlmsg_cancel(skb, nlh);
errmsg:
return -EMSGSIZE;
}
static int smc_nl_handle_smcd_lgr(struct smcd_dev *dev,
struct sk_buff *skb,
struct netlink_callback *cb)
{
struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
struct smc_link_group *lgr;
int snum = cb_ctx->pos[1];
int rc = 0, num = 0;
spin_lock_bh(&dev->lgr_lock);
list_for_each_entry(lgr, &dev->lgr_list, list) {
if (!lgr->is_smcd)
continue;
if (num < snum)
goto next;
rc = smc_nl_fill_smcd_lgr(lgr, skb, cb);
if (rc)
goto errout;
next:
num++;
}
errout:
spin_unlock_bh(&dev->lgr_lock);
cb_ctx->pos[1] = num;
return rc;
}
static int smc_nl_fill_smcd_dev(struct smcd_dev_list *dev_list,
struct sk_buff *skb,
struct netlink_callback *cb)
{
struct smc_nl_dmp_ctx *cb_ctx = smc_nl_dmp_ctx(cb);
struct smcd_dev *smcd_dev;
int snum = cb_ctx->pos[0];
int rc = 0, num = 0;
mutex_lock(&dev_list->mutex);
list_for_each_entry(smcd_dev, &dev_list->list, list) {
if (list_empty(&smcd_dev->lgr_list))
continue;
if (num < snum)
goto next;
rc = smc_nl_handle_smcd_lgr(smcd_dev, skb, cb);
if (rc)
goto errout;
next:
num++;
}
errout:
mutex_unlock(&dev_list->mutex);
cb_ctx->pos[0] = num;
return rc;
}
int smcr_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
{
bool list_links = false;
smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);
return skb->len;
}
int smcr_nl_get_link(struct sk_buff *skb, struct netlink_callback *cb)
{
bool list_links = true;
smc_nl_fill_lgr_list(&smc_lgr_list, skb, cb, list_links);
return skb->len;
}
int smcd_nl_get_lgr(struct sk_buff *skb, struct netlink_callback *cb)
{
smc_nl_fill_smcd_dev(&smcd_dev_list, skb, cb);
return skb->len;
}
void smc_lgr_cleanup_early(struct smc_connection *conn)
{
struct smc_link_group *lgr = conn->lgr;
struct list_head *lgr_list;
spinlock_t *lgr_lock;
if (!lgr)
return;
smc_conn_free(conn);
lgr_list = smc_lgr_list_head(lgr, &lgr_lock);
spin_lock_bh(lgr_lock);
/* do not use this link group for new connections */
if (!list_empty(lgr_list))
list_del_init(lgr_list);
spin_unlock_bh(lgr_lock);
__smc_lgr_terminate(lgr, true);
}
static void smcr_lgr_link_deactivate_all(struct smc_link_group *lgr)
{
int i;
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
struct smc_link *lnk = &lgr->lnk[i];
if (smc_link_usable(lnk))
lnk->state = SMC_LNK_INACTIVE;
}
wake_up_all(&lgr->llc_msg_waiter);
wake_up_all(&lgr->llc_flow_waiter);
}
static void smc_lgr_free(struct smc_link_group *lgr);
static void smc_lgr_free_work(struct work_struct *work)
{
struct smc_link_group *lgr = container_of(to_delayed_work(work),
struct smc_link_group,
free_work);
spinlock_t *lgr_lock;
bool conns;
smc_lgr_list_head(lgr, &lgr_lock);
spin_lock_bh(lgr_lock);
if (lgr->freeing) {
spin_unlock_bh(lgr_lock);
return;
}
read_lock_bh(&lgr->conns_lock);
conns = RB_EMPTY_ROOT(&lgr->conns_all);
read_unlock_bh(&lgr->conns_lock);
if (!conns) { /* number of lgr connections is no longer zero */
spin_unlock_bh(lgr_lock);
return;
}
list_del_init(&lgr->list); /* remove from smc_lgr_list */
lgr->freeing = 1; /* this instance does the freeing, no new schedule */
spin_unlock_bh(lgr_lock);
cancel_delayed_work(&lgr->free_work);
if (!lgr->is_smcd && !lgr->terminating)
smc_llc_send_link_delete_all(lgr, true,
SMC_LLC_DEL_PROG_INIT_TERM);
if (lgr->is_smcd && !lgr->terminating)
smc_ism_signal_shutdown(lgr);
if (!lgr->is_smcd)
smcr_lgr_link_deactivate_all(lgr);
smc_lgr_free(lgr);
}
static void smc_lgr_terminate_work(struct work_struct *work)
{
struct smc_link_group *lgr = container_of(work, struct smc_link_group,
terminate_work);
__smc_lgr_terminate(lgr, true);
}
/* return next unique link id for the lgr */
static u8 smcr_next_link_id(struct smc_link_group *lgr)
{
u8 link_id;
int i;
while (1) {
link_id = ++lgr->next_link_id;
if (!link_id) /* skip zero as link_id */
link_id = ++lgr->next_link_id;
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
if (smc_link_usable(&lgr->lnk[i]) &&
lgr->lnk[i].link_id == link_id)
continue;
}
break;
}
return link_id;
}
static void smcr_copy_dev_info_to_link(struct smc_link *link)
{
struct smc_ib_device *smcibdev = link->smcibdev;
snprintf(link->ibname, sizeof(link->ibname), "%s",
smcibdev->ibdev->name);
link->ndev_ifidx = smcibdev->ndev_ifidx[link->ibport - 1];
}
int smcr_link_init(struct smc_link_group *lgr, struct smc_link *lnk,
u8 link_idx, struct smc_init_info *ini)
{
u8 rndvec[3];
int rc;
get_device(&ini->ib_dev->ibdev->dev);
atomic_inc(&ini->ib_dev->lnk_cnt);
lnk->link_id = smcr_next_link_id(lgr);
lnk->lgr = lgr;
lnk->link_idx = link_idx;
lnk->smcibdev = ini->ib_dev;
lnk->ibport = ini->ib_port;
smc_ibdev_cnt_inc(lnk);
smcr_copy_dev_info_to_link(lnk);
lnk->path_mtu = ini->ib_dev->pattr[ini->ib_port - 1].active_mtu;
atomic_set(&lnk->conn_cnt, 0);
smc_llc_link_set_uid(lnk);
INIT_WORK(&lnk->link_down_wrk, smc_link_down_work);
if (!ini->ib_dev->initialized) {
rc = (int)smc_ib_setup_per_ibdev(ini->ib_dev);
if (rc)
goto out;
}
get_random_bytes(rndvec, sizeof(rndvec));
lnk->psn_initial = rndvec[0] + (rndvec[1] << 8) +
(rndvec[2] << 16);
rc = smc_ib_determine_gid(lnk->smcibdev, lnk->ibport,
ini->vlan_id, lnk->gid, &lnk->sgid_index);
if (rc)
goto out;
rc = smc_llc_link_init(lnk);
if (rc)
goto out;
rc = smc_wr_alloc_link_mem(lnk);
if (rc)
goto clear_llc_lnk;
rc = smc_ib_create_protection_domain(lnk);
if (rc)
goto free_link_mem;
rc = smc_ib_create_queue_pair(lnk);
if (rc)
goto dealloc_pd;
rc = smc_wr_create_link(lnk);
if (rc)
goto destroy_qp;
lnk->state = SMC_LNK_ACTIVATING;
return 0;
destroy_qp:
smc_ib_destroy_queue_pair(lnk);
dealloc_pd:
smc_ib_dealloc_protection_domain(lnk);
free_link_mem:
smc_wr_free_link_mem(lnk);
clear_llc_lnk:
smc_llc_link_clear(lnk, false);
out:
smc_ibdev_cnt_dec(lnk);
put_device(&ini->ib_dev->ibdev->dev);
memset(lnk, 0, sizeof(struct smc_link));
lnk->state = SMC_LNK_UNUSED;
if (!atomic_dec_return(&ini->ib_dev->lnk_cnt))
wake_up(&ini->ib_dev->lnks_deleted);
return rc;
}
/* create a new SMC link group */
static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
{
struct smc_link_group *lgr;
struct list_head *lgr_list;
struct smc_link *lnk;
spinlock_t *lgr_lock;
u8 link_idx;
int rc = 0;
int i;
if (ini->is_smcd && ini->vlan_id) {
if (smc_ism_get_vlan(ini->ism_dev[ini->ism_selected],
ini->vlan_id)) {
rc = SMC_CLC_DECL_ISMVLANERR;
goto out;
}
}
lgr = kzalloc(sizeof(*lgr), GFP_KERNEL);
if (!lgr) {
rc = SMC_CLC_DECL_MEM;
goto ism_put_vlan;
}
lgr->tx_wq = alloc_workqueue("smc_tx_wq-%*phN", 0, 0,
SMC_LGR_ID_SIZE, &lgr->id);
if (!lgr->tx_wq) {
rc = -ENOMEM;
goto free_lgr;
}
lgr->is_smcd = ini->is_smcd;
lgr->sync_err = 0;
lgr->terminating = 0;
lgr->freeing = 0;
lgr->vlan_id = ini->vlan_id;
mutex_init(&lgr->sndbufs_lock);
mutex_init(&lgr->rmbs_lock);
rwlock_init(&lgr->conns_lock);
for (i = 0; i < SMC_RMBE_SIZES; i++) {
INIT_LIST_HEAD(&lgr->sndbufs[i]);
INIT_LIST_HEAD(&lgr->rmbs[i]);
}
lgr->next_link_id = 0;
smc_lgr_list.num += SMC_LGR_NUM_INCR;
memcpy(&lgr->id, (u8 *)&smc_lgr_list.num, SMC_LGR_ID_SIZE);
INIT_DELAYED_WORK(&lgr->free_work, smc_lgr_free_work);
INIT_WORK(&lgr->terminate_work, smc_lgr_terminate_work);
lgr->conns_all = RB_ROOT;
if (ini->is_smcd) {
/* SMC-D specific settings */
get_device(&ini->ism_dev[ini->ism_selected]->dev);
lgr->peer_gid = ini->ism_peer_gid[ini->ism_selected];
lgr->smcd = ini->ism_dev[ini->ism_selected];
lgr_list = &ini->ism_dev[ini->ism_selected]->lgr_list;
lgr_lock = &lgr->smcd->lgr_lock;
lgr->smc_version = ini->smcd_version;
lgr->peer_shutdown = 0;
atomic_inc(&ini->ism_dev[ini->ism_selected]->lgr_cnt);
} else {
/* SMC-R specific settings */
lgr->role = smc->listen_smc ? SMC_SERV : SMC_CLNT;
memcpy(lgr->peer_systemid, ini->ib_lcl->id_for_peer,
SMC_SYSTEMID_LEN);
memcpy(lgr->pnet_id, ini->ib_dev->pnetid[ini->ib_port - 1],
SMC_MAX_PNETID_LEN);
smc_llc_lgr_init(lgr, smc);
link_idx = SMC_SINGLE_LINK;
lnk = &lgr->lnk[link_idx];
rc = smcr_link_init(lgr, lnk, link_idx, ini);
if (rc)
goto free_wq;
lgr_list = &smc_lgr_list.list;
lgr_lock = &smc_lgr_list.lock;
atomic_inc(&lgr_cnt);
}
smc->conn.lgr = lgr;
spin_lock_bh(lgr_lock);
list_add_tail(&lgr->list, lgr_list);
spin_unlock_bh(lgr_lock);
return 0;
free_wq:
destroy_workqueue(lgr->tx_wq);
free_lgr:
kfree(lgr);
ism_put_vlan:
if (ini->is_smcd && ini->vlan_id)
smc_ism_put_vlan(ini->ism_dev[ini->ism_selected], ini->vlan_id);
out:
if (rc < 0) {
if (rc == -ENOMEM)
rc = SMC_CLC_DECL_MEM;
else
rc = SMC_CLC_DECL_INTERR;
}
return rc;
}
static int smc_write_space(struct smc_connection *conn)
{
int buffer_len = conn->peer_rmbe_size;
union smc_host_cursor prod;
union smc_host_cursor cons;
int space;
smc_curs_copy(&prod, &conn->local_tx_ctrl.prod, conn);
smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
/* determine rx_buf space */
space = buffer_len - smc_curs_diff(buffer_len, &cons, &prod);
return space;
}
static int smc_switch_cursor(struct smc_sock *smc, struct smc_cdc_tx_pend *pend,
struct smc_wr_buf *wr_buf)
{
struct smc_connection *conn = &smc->conn;
union smc_host_cursor cons, fin;
int rc = 0;
int diff;
smc_curs_copy(&conn->tx_curs_sent, &conn->tx_curs_fin, conn);
smc_curs_copy(&fin, &conn->local_tx_ctrl_fin, conn);
/* set prod cursor to old state, enforce tx_rdma_writes() */
smc_curs_copy(&conn->local_tx_ctrl.prod, &fin, conn);
smc_curs_copy(&cons, &conn->local_rx_ctrl.cons, conn);
if (smc_curs_comp(conn->peer_rmbe_size, &cons, &fin) < 0) {
/* cons cursor advanced more than fin, and prod was set
* fin above, so now prod is smaller than cons. Fix that.
*/
diff = smc_curs_diff(conn->peer_rmbe_size, &fin, &cons);
smc_curs_add(conn->sndbuf_desc->len,
&conn->tx_curs_sent, diff);
smc_curs_add(conn->sndbuf_desc->len,
&conn->tx_curs_fin, diff);
smp_mb__before_atomic();
atomic_add(diff, &conn->sndbuf_space);
smp_mb__after_atomic();
smc_curs_add(conn->peer_rmbe_size,
&conn->local_tx_ctrl.prod, diff);
smc_curs_add(conn->peer_rmbe_size,
&conn->local_tx_ctrl_fin, diff);
}
/* recalculate, value is used by tx_rdma_writes() */
atomic_set(&smc->conn.peer_rmbe_space, smc_write_space(conn));
if (smc->sk.sk_state != SMC_INIT &&
smc->sk.sk_state != SMC_CLOSED) {
rc = smcr_cdc_msg_send_validation(conn, pend, wr_buf);
if (!rc) {
queue_delayed_work(conn->lgr->tx_wq, &conn->tx_work, 0);
smc->sk.sk_data_ready(&smc->sk);
}
} else {
smc_wr_tx_put_slot(conn->lnk,
(struct smc_wr_tx_pend_priv *)pend);
}
return rc;
}
static void smc_switch_link_and_count(struct smc_connection *conn,
struct smc_link *to_lnk)
{
atomic_dec(&conn->lnk->conn_cnt);
conn->lnk = to_lnk;
atomic_inc(&conn->lnk->conn_cnt);
}
struct smc_link *smc_switch_conns(struct smc_link_group *lgr,
struct smc_link *from_lnk, bool is_dev_err)
{
struct smc_link *to_lnk = NULL;
struct smc_cdc_tx_pend *pend;
struct smc_connection *conn;
struct smc_wr_buf *wr_buf;
struct smc_sock *smc;
struct rb_node *node;
int i, rc = 0;
/* link is inactive, wake up tx waiters */
smc_wr_wakeup_tx_wait(from_lnk);
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
if (!smc_link_active(&lgr->lnk[i]) || i == from_lnk->link_idx)
continue;
if (is_dev_err && from_lnk->smcibdev == lgr->lnk[i].smcibdev &&
from_lnk->ibport == lgr->lnk[i].ibport) {
continue;
}
to_lnk = &lgr->lnk[i];
break;
}
if (!to_lnk) {
smc_lgr_terminate_sched(lgr);
return NULL;
}
again:
read_lock_bh(&lgr->conns_lock);
for (node = rb_first(&lgr->conns_all); node; node = rb_next(node)) {
conn = rb_entry(node, struct smc_connection, alert_node);
if (conn->lnk != from_lnk)
continue;
smc = container_of(conn, struct smc_sock, conn);
/* conn->lnk not yet set in SMC_INIT state */
if (smc->sk.sk_state == SMC_INIT)
continue;
if (smc->sk.sk_state == SMC_CLOSED ||
smc->sk.sk_state == SMC_PEERCLOSEWAIT1 ||
smc->sk.sk_state == SMC_PEERCLOSEWAIT2 ||
smc->sk.sk_state == SMC_APPFINCLOSEWAIT ||
smc->sk.sk_state == SMC_APPCLOSEWAIT1 ||
smc->sk.sk_state == SMC_APPCLOSEWAIT2 ||
smc->sk.sk_state == SMC_PEERFINCLOSEWAIT ||
smc->sk.sk_state == SMC_PEERABORTWAIT ||
smc->sk.sk_state == SMC_PROCESSABORT) {
spin_lock_bh(&conn->send_lock);
smc_switch_link_and_count(conn, to_lnk);
spin_unlock_bh(&conn->send_lock);
continue;
}
sock_hold(&smc->sk);
read_unlock_bh(&lgr->conns_lock);
/* pre-fetch buffer outside of send_lock, might sleep */
rc = smc_cdc_get_free_slot(conn, to_lnk, &wr_buf, NULL, &pend);
if (rc) {
smcr_link_down_cond_sched(to_lnk);
return NULL;
}
/* avoid race with smcr_tx_sndbuf_nonempty() */
spin_lock_bh(&conn->send_lock);
smc_switch_link_and_count(conn, to_lnk);
rc = smc_switch_cursor(smc, pend, wr_buf);
spin_unlock_bh(&conn->send_lock);
sock_put(&smc->sk);
if (rc) {
smcr_link_down_cond_sched(to_lnk);
return NULL;
}
goto again;
}
read_unlock_bh(&lgr->conns_lock);
return to_lnk;