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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 <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"
#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)
#define SMC_LGR_FREE_DELAY_FAST (8 * HZ)
static 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_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 && !lgr->freefast) {
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);
}
}
void smc_lgr_schedule_free_work_fast(struct smc_link_group *lgr)
{
if (!lgr->freeing && !lgr->freefast) {
lgr->freefast = 1;
mod_delayed_work(system_wq, &lgr->free_work,
SMC_LGR_FREE_DELAY_FAST);
}
}
/* 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;
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);
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;
}
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_schedule_free_work_fast(lgr);
}
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;
}
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;
lnk->path_mtu = ini->ib_dev->pattr[ini->ib_port - 1].active_mtu;
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:
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->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->is_smcd = ini->is_smcd;
lgr->sync_err = 0;
lgr->terminating = 0;
lgr->freefast = 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->dev);
lgr->peer_gid = ini->ism_gid;
lgr->smcd = ini->ism_dev;
lgr_list = &ini->ism_dev->lgr_list;
lgr_lock = &lgr->smcd->lgr_lock;
lgr->peer_shutdown = 0;
atomic_inc(&ini->ism_dev->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_lgr;
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_lgr:
kfree(lgr);
ism_put_vlan:
if (ini->is_smcd && ini->vlan_id)
smc_ism_put_vlan(ini->ism_dev, 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) {
schedule_delayed_work(&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;
}
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);
conn->lnk = 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);
conn->lnk = 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;
}
static void smcr_buf_unuse(struct smc_buf_desc *rmb_desc,
struct smc_link_group *lgr)
{
int rc;
if (rmb_desc->is_conf_rkey && !list_empty(&lgr->list)) {
/* unregister rmb with peer */
rc = smc_llc_flow_initiate(lgr, SMC_LLC_FLOW_RKEY);
if (!rc) {
/* protect against smc_llc_cli_rkey_exchange() */
mutex_lock(&lgr->llc_conf_mutex);
smc_llc_do_delete_rkey(lgr, rmb_desc);
rmb_desc->is_conf_rkey = false;
mutex_unlock(&lgr->llc_conf_mutex);
smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
}
}
if (rmb_desc->is_reg_err) {
/* buf registration failed, reuse not possible */
mutex_lock(&lgr->rmbs_lock);
list_del(&rmb_desc->list);
mutex_unlock(&lgr->rmbs_lock);
smc_buf_free(lgr, true, rmb_desc);
} else {
rmb_desc->used = 0;
}
}
static void smc_buf_unuse(struct smc_connection *conn,
struct smc_link_group *lgr)
{
if (conn->sndbuf_desc)
conn->sndbuf_desc->used = 0;
if (conn->rmb_desc && lgr->is_smcd)
conn->rmb_desc->used = 0;
else if (conn->rmb_desc)
smcr_buf_unuse(conn->rmb_desc, lgr);
}
/* remove a finished connection from its link group */
void smc_conn_free(struct smc_connection *conn)
{
struct smc_link_group *lgr = conn->lgr;
if (!lgr)
return;
if (lgr->is_smcd) {
if (!list_empty(&lgr->list))
smc_ism_unset_conn(conn);
tasklet_kill(&conn->rx_tsklet);
} else {
smc_cdc_tx_dismiss_slots(conn);
if (current_work() != &conn->abort_work)
cancel_work_sync(&conn->abort_work);
}
if (!list_empty(&lgr->list)) {
smc_lgr_unregister_conn(conn);
smc_buf_unuse(conn, lgr); /* allow buffer reuse */
}
if (!lgr->conns_num)
smc_lgr_schedule_free_work(lgr);
}
/* unregister a link from a buf_desc */
static void smcr_buf_unmap_link(struct smc_buf_desc *buf_desc, bool is_rmb,
struct smc_link *lnk)
{
if (is_rmb)
buf_desc->is_reg_mr[lnk->link_idx] = false;
if (!buf_desc->is_map_ib[lnk->link_idx])
return;
if (is_rmb) {
if (buf_desc->mr_rx[lnk->link_idx]) {
smc_ib_put_memory_region(
buf_desc->mr_rx[lnk->link_idx]);
buf_desc->mr_rx[lnk->link_idx] = NULL;
}
smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_FROM_DEVICE);
} else {
smc_ib_buf_unmap_sg(lnk, buf_desc, DMA_TO_DEVICE);
}
sg_free_table(&buf_desc->sgt[lnk->link_idx]);
buf_desc->is_map_ib[lnk->link_idx] = false;
}
/* unmap all buffers of lgr for a deleted link */
static void smcr_buf_unmap_lgr(struct smc_link *lnk)
{
struct smc_link_group *lgr = lnk->lgr;
struct smc_buf_desc *buf_desc, *bf;
int i;
for (i = 0; i < SMC_RMBE_SIZES; i++) {
mutex_lock(&lgr->rmbs_lock);
list_for_each_entry_safe(buf_desc, bf, &lgr->rmbs[i], list)
smcr_buf_unmap_link(buf_desc, true, lnk);
mutex_unlock(&lgr->rmbs_lock);
mutex_lock(&lgr->sndbufs_lock);
list_for_each_entry_safe(buf_desc, bf, &lgr->sndbufs[i],
list)
smcr_buf_unmap_link(buf_desc, false, lnk);
mutex_unlock(&lgr->sndbufs_lock);
}
}
static void smcr_rtoken_clear_link(struct smc_link *lnk)
{
struct smc_link_group *lgr = lnk->lgr;
int i;
for (i = 0; i < SMC_RMBS_PER_LGR_MAX; i++) {
lgr->rtokens[i][lnk->link_idx].rkey = 0;
lgr->rtokens[i][lnk->link_idx].dma_addr = 0;
}
}
/* must be called under lgr->llc_conf_mutex lock */
void smcr_link_clear(struct smc_link *lnk, bool log)
{
struct smc_ib_device *smcibdev;
if (!lnk->lgr || lnk->state == SMC_LNK_UNUSED)
return;
lnk->peer_qpn = 0;
smc_llc_link_clear(lnk, log);
smcr_buf_unmap_lgr(lnk);
smcr_rtoken_clear_link(lnk);
smc_ib_modify_qp_reset(lnk);
smc_wr_free_link(lnk);
smc_ib_destroy_queue_pair(lnk);
smc_ib_dealloc_protection_domain(lnk);
smc_wr_free_link_mem(lnk);
put_device(&lnk->smcibdev->ibdev->dev);
smcibdev = lnk->smcibdev;
memset(lnk, 0, sizeof(struct smc_link));
lnk->state = SMC_LNK_UNUSED;
if (!atomic_dec_return(&smcibdev->lnk_cnt))
wake_up(&smcibdev->lnks_deleted);
}
static void smcr_buf_free(struct smc_link_group *lgr, bool is_rmb,
struct smc_buf_desc *buf_desc)
{
int i;
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++)
smcr_buf_unmap_link(buf_desc, is_rmb, &lgr->lnk[i]);
if (buf_desc->pages)
__free_pages(buf_desc->pages, buf_desc->order);
kfree(buf_desc);
}
static void smcd_buf_free(struct smc_link_group *lgr, bool is_dmb,
struct smc_buf_desc *buf_desc)
{
if (is_dmb) {
/* restore original buf len */
buf_desc->len += sizeof(struct smcd_cdc_msg);
smc_ism_unregister_dmb(lgr->smcd, buf_desc);
} else {
kfree(buf_desc->cpu_addr);
}
kfree(buf_desc);
}
static void smc_buf_free(struct smc_link_group *lgr, bool is_rmb,
struct smc_buf_desc *buf_desc)
{
if (lgr->is_smcd)
smcd_buf_free(lgr, is_rmb, buf_desc);
else
smcr_buf_free(lgr, is_rmb, buf_desc);
}
static void __smc_lgr_free_bufs(struct smc_link_group *lgr, bool is_rmb)
{
struct smc_buf_desc *buf_desc, *bf_desc;
struct list_head *buf_list;
int i;
for (i = 0; i < SMC_RMBE_SIZES; i++) {
if (is_rmb)
buf_list = &lgr->rmbs[i];
else
buf_list = &lgr->sndbufs[i];
list_for_each_entry_safe(buf_desc, bf_desc, buf_list,
list) {
list_del(&buf_desc->list);
smc_buf_free(lgr, is_rmb, buf_desc);
}
}
}
static void smc_lgr_free_bufs(struct smc_link_group *lgr)
{
/* free send buffers */
__smc_lgr_free_bufs(lgr, false);
/* free rmbs */
__smc_lgr_free_bufs(lgr, true);
}
/* remove a link group */
static void smc_lgr_free(struct smc_link_group *lgr)
{
int i;
if (!lgr->is_smcd) {
mutex_lock(&lgr->llc_conf_mutex);
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
if (lgr->lnk[i].state != SMC_LNK_UNUSED)
smcr_link_clear(&lgr->lnk[i], false);
}
mutex_unlock(&lgr->llc_conf_mutex);
smc_llc_lgr_clear(lgr);
}
smc_lgr_free_bufs(lgr);
if (lgr->is_smcd) {
if (!lgr->terminating) {
smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
put_device(&lgr->smcd->dev);
}
if (!atomic_dec_return(&lgr->smcd->lgr_cnt))
wake_up(&lgr->smcd->lgrs_deleted);
} else {
if (!atomic_dec_return(&lgr_cnt))
wake_up(&lgrs_deleted);
}
kfree(lgr);
}
static void smcd_unregister_all_dmbs(struct smc_link_group *lgr)
{
int i;
for (i = 0; i < SMC_RMBE_SIZES; i++) {
struct smc_buf_desc *buf_desc;
list_for_each_entry(buf_desc, &lgr->rmbs[i], list) {
buf_desc->len += sizeof(struct smcd_cdc_msg);
smc_ism_unregister_dmb(lgr->smcd, buf_desc);
}
}
}
static void smc_sk_wake_ups(struct smc_sock *smc)
{
smc->sk.sk_write_space(&smc->sk);
smc->sk.sk_data_ready(&smc->sk);
smc->sk.sk_state_change(&smc->sk);
}
/* kill a connection */
static void smc_conn_kill(struct smc_connection *conn, bool soft)
{
struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
if (conn->lgr->is_smcd && conn->lgr->peer_shutdown)
conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
else
smc_close_abort(conn);
conn->killed = 1;
smc->sk.sk_err = ECONNABORTED;
smc_sk_wake_ups(smc);
if (conn->lgr->is_smcd) {
smc_ism_unset_conn(conn);
if (soft)
tasklet_kill(&conn->rx_tsklet);
else
tasklet_unlock_wait(&conn->rx_tsklet);
} else {
smc_cdc_tx_dismiss_slots(conn);
}
smc_lgr_unregister_conn(conn);
smc_close_active_abort(smc);
}
static void smc_lgr_cleanup(struct smc_link_group *lgr)
{
if (lgr->is_smcd) {
smc_ism_signal_shutdown(lgr);
smcd_unregister_all_dmbs(lgr);
smc_ism_put_vlan(lgr->smcd, lgr->vlan_id);
put_device(&lgr->smcd->dev);
} else {
u32 rsn = lgr->llc_termination_rsn;
if (!rsn)
rsn = SMC_LLC_DEL_PROG_INIT_TERM;
smc_llc_send_link_delete_all(lgr, false, rsn);
smcr_lgr_link_deactivate_all(lgr);
}
}
/* terminate link group
* @soft: true if link group shutdown can take its time
* false if immediate link group shutdown is required
*/
static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft)
{
struct smc_connection *conn;
struct smc_sock *smc;
struct rb_node *node;
if (lgr->terminating)
return; /* lgr already terminating */
/* cancel free_work sync, will terminate when lgr->freeing is set */
cancel_delayed_work_sync(&lgr->free_work);
lgr->terminating = 1;
/* kill remaining link group connections */
read_lock_bh(&lgr->conns_lock);
node = rb_first(&lgr->conns_all);
while (node) {
read_unlock_bh(&lgr->conns_lock);
conn = rb_entry(node, struct smc_connection, alert_node);
smc = container_of(conn, struct smc_sock, conn);
sock_hold(&smc->sk); /* sock_put below */
lock_sock(&smc->sk);
smc_conn_kill(conn, soft);
release_sock(&smc->sk);
sock_put(&smc->sk); /* sock_hold above */
read_lock_bh(&lgr->conns_lock);
node = rb_first(&lgr->conns_all);
}
read_unlock_bh(&lgr->conns_lock);
smc_lgr_cleanup(lgr);
smc_lgr_free(lgr);
}
/* unlink link group and schedule termination */
void smc_lgr_terminate_sched(struct smc_link_group *lgr)
{
spinlock_t *lgr_lock;
smc_lgr_list_head(lgr, &lgr_lock);
spin_lock_bh(lgr_lock);
if (list_empty(&lgr->list) || lgr->terminating || lgr->freeing) {
spin_unlock_bh(lgr_lock);
return; /* lgr already terminating */
}
list_del_init(&lgr->list);
lgr->freeing = 1;
spin_unlock_bh(lgr_lock);
schedule_work(&lgr->terminate_work);
}
/* Called when peer lgr shutdown (regularly or abnormally) is received */
void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short vlan)
{
struct smc_link_group *lgr, *l;
LIST_HEAD(lgr_free_list);
/* run common cleanup function and build free list */
spin_lock_bh(&dev->lgr_lock);
list_for_each_entry_safe(lgr, l, &dev->lgr_list, list) {
if ((!peer_gid || lgr->peer_gid == peer_gid) &&
(vlan == VLAN_VID_MASK || lgr->vlan_id == vlan)) {
if (peer_gid) /* peer triggered termination */
lgr->peer_shutdown = 1;
list_move(&lgr->list, &lgr_free_list);
lgr->freeing = 1;
}
}
spin_unlock_bh(&dev->lgr_lock);
/* cancel the regular free workers and actually free lgrs */
list_for_each_entry_safe(lgr, l, &lgr_free_list, list) {
list_del_init(&lgr->list);
schedule_work(&lgr->terminate_work);
}
}
/* Called when an SMCD device is removed or the smc module is unloaded */
void smc_smcd_terminate_all(struct smcd_dev *smcd)
{
struct smc_link_group *lgr, *lg;
LIST_HEAD(lgr_free_list);
spin_lock_bh(&smcd->lgr_lock);
list_splice_init(&smcd->lgr_list, &lgr_free_list);
list_for_each_entry(lgr, &lgr_free_list, list)
lgr->freeing = 1;
spin_unlock_bh(&smcd->lgr_lock);
list_for_each_entry_safe(lgr, lg, &lgr_free_list, list) {
list_del_init(&lgr->list);
__smc_lgr_terminate(lgr, false);
}
if (atomic_read(&smcd->lgr_cnt))