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net/smc: llc_del_link_work and use the LLC flow for delete link

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Introduce a work that is scheduled when a new DELETE_LINK LLC request is
received. The work will call either the SMC client or SMC server
DELETE_LINK processing.
And use the LLC flow framework to process incoming DELETE_LINK LLC
messages, scheduling the llc_del_link_work for those events.
With these changes smc_lgr_forget() is only called by one function and
can be migrated into smc_lgr_cleanup_early().

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Karsten Graul 2020-05-03 14:38:47 +02:00 committed by David S. Miller
parent c9a5d24303
commit 9ec6bf19ec
3 changed files with 45 additions and 34 deletions
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22
net/smc/smc_core.c
View file

@ -193,12 +193,19 @@ static void smc_lgr_unregister_conn(struct smc_connection *conn)
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);
smc_lgr_forget(lgr);
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);
}
@ -653,19 +660,6 @@ static void smc_lgr_free(struct smc_link_group *lgr)
kfree(lgr);
}
void smc_lgr_forget(struct smc_link_group *lgr)
{
struct list_head *lgr_list;
spinlock_t *lgr_lock;
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);
}
static void smcd_unregister_all_dmbs(struct smc_link_group *lgr)
{
int i;

2
net/smc/smc_core.h
View file

@ -254,6 +254,7 @@ struct smc_link_group {
struct mutex llc_conf_mutex;
/* protects lgr reconfig. */
struct work_struct llc_add_link_work;
struct work_struct llc_del_link_work;
struct work_struct llc_event_work;
/* llc event worker */
wait_queue_head_t llc_waiter;
@ -343,7 +344,6 @@ struct smc_sock;
struct smc_clc_msg_accept_confirm;
struct smc_clc_msg_local;
void smc_lgr_forget(struct smc_link_group *lgr);
void smc_lgr_cleanup_early(struct smc_connection *conn);
void smc_lgr_terminate_sched(struct smc_link_group *lgr);
void smcr_port_add(struct smc_ib_device *smcibdev, u8 ibport);

55
net/smc/smc_llc.c
View file

@ -1118,22 +1118,18 @@ out:
smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
}
static void smc_llc_rx_delete_link(struct smc_link *link,
struct smc_llc_msg_del_link *llc)
static void smc_llc_delete_link_work(struct work_struct *work)
{
struct smc_link_group *lgr = smc_get_lgr(link);
struct smc_link_group *lgr = container_of(work, struct smc_link_group,
llc_del_link_work);
smc_lgr_forget(lgr);
if (lgr->role == SMC_SERV) {
/* client asks to delete this link, send request */
smc_llc_send_delete_link(link, 0, SMC_LLC_REQ, true,
SMC_LLC_DEL_PROG_INIT_TERM);
} else {
/* server requests to delete this link, send response */
smc_llc_send_delete_link(link, 0, SMC_LLC_RESP, true,
SMC_LLC_DEL_PROG_INIT_TERM);
if (list_empty(&lgr->list)) {
/* link group is terminating */
smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
goto out;
}
smcr_link_down_cond(link);
out:
smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
}
/* process a confirm_rkey request from peer, remote flow */
@ -1255,8 +1251,30 @@ static void smc_llc_event_handler(struct smc_llc_qentry *qentry)
}
break;
case SMC_LLC_DELETE_LINK:
smc_llc_rx_delete_link(link, &llc->delete_link);
break;
if (lgr->role == SMC_CLNT) {
/* server requests to delete this link, send response */
if (lgr->llc_flow_lcl.type != SMC_LLC_FLOW_NONE) {
/* DEL LINK REQ during ADD LINK SEQ */
smc_llc_flow_qentry_set(&lgr->llc_flow_lcl,
qentry);
wake_up_interruptible(&lgr->llc_waiter);
} else if (smc_llc_flow_start(&lgr->llc_flow_lcl,
qentry)) {
schedule_work(&lgr->llc_del_link_work);
}
} else {
if (lgr->llc_flow_lcl.type == SMC_LLC_FLOW_ADD_LINK &&
!lgr->llc_flow_lcl.qentry) {
/* DEL LINK REQ during ADD LINK SEQ */
smc_llc_flow_qentry_set(&lgr->llc_flow_lcl,
qentry);
wake_up_interruptible(&lgr->llc_waiter);
} else if (smc_llc_flow_start(&lgr->llc_flow_lcl,
qentry)) {
schedule_work(&lgr->llc_del_link_work);
}
}
return;
case SMC_LLC_CONFIRM_RKEY:
/* new request from remote, assign to remote flow */
if (smc_llc_flow_start(&lgr->llc_flow_rmt, qentry)) {
@ -1325,6 +1343,7 @@ static void smc_llc_rx_response(struct smc_link *link,
complete(&link->llc_testlink_resp);
break;
case SMC_LLC_ADD_LINK:
case SMC_LLC_DELETE_LINK:
case SMC_LLC_CONFIRM_LINK:
case SMC_LLC_ADD_LINK_CONT:
case SMC_LLC_CONFIRM_RKEY:
@ -1333,10 +1352,6 @@ static void smc_llc_rx_response(struct smc_link *link,
smc_llc_flow_qentry_set(&link->lgr->llc_flow_lcl, qentry);
wake_up_interruptible(&link->lgr->llc_waiter);
return;
case SMC_LLC_DELETE_LINK:
if (link->lgr->role == SMC_SERV)
smc_lgr_schedule_free_work_fast(link->lgr);
break;
case SMC_LLC_CONFIRM_RKEY_CONT:
/* not used because max links is 3 */
break;
@ -1424,6 +1439,7 @@ void smc_llc_lgr_init(struct smc_link_group *lgr, struct smc_sock *smc)
INIT_WORK(&lgr->llc_event_work, smc_llc_event_work);
INIT_WORK(&lgr->llc_add_link_work, smc_llc_add_link_work);
INIT_WORK(&lgr->llc_del_link_work, smc_llc_delete_link_work);
INIT_LIST_HEAD(&lgr->llc_event_q);
spin_lock_init(&lgr->llc_event_q_lock);
spin_lock_init(&lgr->llc_flow_lock);
@ -1439,6 +1455,7 @@ void smc_llc_lgr_clear(struct smc_link_group *lgr)
wake_up_interruptible_all(&lgr->llc_waiter);
cancel_work_sync(&lgr->llc_event_work);
cancel_work_sync(&lgr->llc_add_link_work);
cancel_work_sync(&lgr->llc_del_link_work);
if (lgr->delayed_event) {
kfree(lgr->delayed_event);
lgr->delayed_event = NULL;