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net/smc: improve delete link processing 

Send an orderly DELETE LINK request before termination of a link group,
add support for client triggered DELETE LINK processing. And send a
disorderly DELETE LINK before module is unloaded.

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Karsten Graul 2018-07-25 16:35:33 +02:00 committed by David S. Miller
parent 603cc14984
commit 0d18a0cb4b
5 changed files with 68 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

47
net/smc/smc_core.c
View File

@ -30,6 +30,7 @@
#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),
@ -51,6 +52,11 @@ static void smc_lgr_schedule_free_work(struct smc_link_group *lgr)
SMC_LGR_FREE_DELAY_CLNT : SMC_LGR_FREE_DELAY_SERV);
}
void smc_lgr_schedule_free_work_fast(struct smc_link_group *lgr)
{
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
@ -133,6 +139,20 @@ static void smc_lgr_unregister_conn(struct smc_connection *conn)
smc_lgr_schedule_free_work(lgr);
}
/* Send delete link, either as client to request the initiation
* of the DELETE LINK sequence from server; or as server to
* initiate the delete processing. See smc_llc_rx_delete_link().
*/
static int smc_link_send_delete(struct smc_link *lnk)
{
if (lnk->state == SMC_LNK_ACTIVE &&
!smc_llc_send_delete_link(lnk, SMC_LLC_REQ, true)) {
smc_llc_link_deleting(lnk);
return 0;
}
return -ENOTCONN;
}
static void smc_lgr_free_work(struct work_struct *work)
{
struct smc_link_group *lgr = container_of(to_delayed_work(work),
@ -153,10 +173,21 @@ static void smc_lgr_free_work(struct work_struct *work)
list_del_init(&lgr->list); /* remove from smc_lgr_list */
free:
spin_unlock_bh(&smc_lgr_list.lock);
if (!lgr->is_smcd && !lgr->terminating) {
/* try to send del link msg, on error free lgr immediately */
if (!smc_link_send_delete(&lgr->lnk[SMC_SINGLE_LINK])) {
/* reschedule in case we never receive a response */
smc_lgr_schedule_free_work(lgr);
return;
}
}
if (!delayed_work_pending(&lgr->free_work)) {
if (!lgr->is_smcd &&
lgr->lnk[SMC_SINGLE_LINK].state != SMC_LNK_INACTIVE)
smc_llc_link_inactive(&lgr->lnk[SMC_SINGLE_LINK]);
struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK];
if (!lgr->is_smcd && lnk->state != SMC_LNK_INACTIVE)
smc_llc_link_inactive(lnk);
smc_lgr_free(lgr);
}
}
@ -984,8 +1015,14 @@ void smc_core_exit(void)
spin_unlock_bh(&smc_lgr_list.lock);
list_for_each_entry_safe(lgr, lg, &lgr_freeing_list, list) {
list_del_init(&lgr->list);
if (!lgr->is_smcd)
smc_llc_link_inactive(&lgr->lnk[SMC_SINGLE_LINK]);
if (!lgr->is_smcd) {
struct smc_link *lnk = &lgr->lnk[SMC_SINGLE_LINK];
if (lnk->state == SMC_LNK_ACTIVE)
smc_llc_send_delete_link(lnk, SMC_LLC_REQ,
false);
smc_llc_link_inactive(lnk);
}
cancel_delayed_work_sync(&lgr->free_work);
smc_lgr_free(lgr); /* free link group */
}

4
net/smc/smc_core.h
View File

@ -34,7 +34,8 @@ enum smc_lgr_role { /* possible roles of a link group */
enum smc_link_state { /* possible states of a link */
SMC_LNK_INACTIVE, /* link is inactive */
SMC_LNK_ACTIVATING, /* link is being activated */
SMC_LNK_ACTIVE /* link is active */
SMC_LNK_ACTIVE, /* link is active */
SMC_LNK_DELETING, /* link is being deleted */
};
#define SMC_WR_BUF_SIZE 48 /* size of work request buffer */
@ -265,6 +266,7 @@ int smc_conn_create(struct smc_sock *smc, bool is_smcd, int srv_first_contact,
struct smc_clc_msg_local *lcl, struct smcd_dev *smcd,
u64 peer_gid);
void smcd_conn_free(struct smc_connection *conn);
void smc_lgr_schedule_free_work_fast(struct smc_link_group *lgr);
void smc_core_exit(void);
static inline struct smc_link_group *smc_get_lgr(struct smc_link *link)

30
net/smc/smc_llc.c
View File

@ -278,7 +278,7 @@ int smc_llc_send_add_link(struct smc_link *link, u8 mac[], u8 gid[],
/* prepare a delete link message */
static void smc_llc_prep_delete_link(struct smc_llc_msg_del_link *delllc,
struct smc_link *link,
enum smc_llc_reqresp reqresp)
enum smc_llc_reqresp reqresp, bool orderly)
{
memset(delllc, 0, sizeof(*delllc));
delllc->hd.common.type = SMC_LLC_DELETE_LINK;
@ -287,13 +287,14 @@ static void smc_llc_prep_delete_link(struct smc_llc_msg_del_link *delllc,
delllc->hd.flags |= SMC_LLC_FLAG_RESP;
/* DEL_LINK_ALL because only 1 link supported */
delllc->hd.flags |= SMC_LLC_FLAG_DEL_LINK_ALL;
delllc->hd.flags |= SMC_LLC_FLAG_DEL_LINK_ORDERLY;
if (orderly)
delllc->hd.flags |= SMC_LLC_FLAG_DEL_LINK_ORDERLY;
delllc->link_num = link->link_id;
}
/* send DELETE LINK request or response */
int smc_llc_send_delete_link(struct smc_link *link,
enum smc_llc_reqresp reqresp)
enum smc_llc_reqresp reqresp, bool orderly)
{
struct smc_llc_msg_del_link *delllc;
struct smc_wr_tx_pend_priv *pend;
@ -304,7 +305,7 @@ int smc_llc_send_delete_link(struct smc_link *link,
if (rc)
return rc;
delllc = (struct smc_llc_msg_del_link *)wr_buf;
smc_llc_prep_delete_link(delllc, link, reqresp);
smc_llc_prep_delete_link(delllc, link, reqresp, orderly);
/* send llc message */
rc = smc_wr_tx_send(link, pend);
return rc;
@ -438,17 +439,19 @@ static void smc_llc_rx_delete_link(struct smc_link *link,
if (llc->hd.flags & SMC_LLC_FLAG_RESP) {
if (lgr->role == SMC_SERV)
smc_lgr_terminate(lgr);
smc_lgr_schedule_free_work_fast(lgr);
} else {
smc_lgr_forget(lgr);
smc_llc_link_deleting(link);
if (lgr->role == SMC_SERV) {
smc_lgr_forget(lgr);
smc_llc_prep_delete_link(llc, link, SMC_LLC_REQ);
smc_llc_send_message(link, llc, sizeof(*llc));
/* client asks to delete this link, send request */
smc_llc_prep_delete_link(llc, link, SMC_LLC_REQ, true);
} else {
smc_llc_prep_delete_link(llc, link, SMC_LLC_RESP);
smc_llc_send_message(link, llc, sizeof(*llc));
smc_lgr_terminate(lgr);
/* server requests to delete this link, send response */
smc_llc_prep_delete_link(llc, link, SMC_LLC_RESP, true);
}
smc_llc_send_message(link, llc, sizeof(*llc));
smc_lgr_schedule_free_work_fast(lgr);
}
}
@ -622,6 +625,11 @@ void smc_llc_link_active(struct smc_link *link, int testlink_time)
}
}
void smc_llc_link_deleting(struct smc_link *link)
{
link->state = SMC_LNK_DELETING;
}
/* called in tasklet context */
void smc_llc_link_inactive(struct smc_link *link)
{

3
net/smc/smc_llc.h
View File

@ -41,9 +41,10 @@ int smc_llc_send_confirm_link(struct smc_link *lnk,
int smc_llc_send_add_link(struct smc_link *link, u8 mac[], u8 gid[],
enum smc_llc_reqresp reqresp);
int smc_llc_send_delete_link(struct smc_link *link,
enum smc_llc_reqresp reqresp);
enum smc_llc_reqresp reqresp, bool orderly);
int smc_llc_link_init(struct smc_link *link);
void smc_llc_link_active(struct smc_link *link, int testlink_time);
void smc_llc_link_deleting(struct smc_link *link);
void smc_llc_link_inactive(struct smc_link *link);
void smc_llc_link_clear(struct smc_link *link);
int smc_llc_do_confirm_rkey(struct smc_link *link,

7
net/smc/smc_wr.c
View File

@ -182,17 +182,14 @@ int smc_wr_tx_get_free_slot(struct smc_link *link,
if (rc)
return rc;
} else {
struct smc_link_group *lgr;
lgr = smc_get_lgr(link);
rc = wait_event_timeout(
link->wr_tx_wait,
list_empty(&lgr->list) || /* lgr terminated */
link->state == SMC_LNK_INACTIVE ||
(smc_wr_tx_get_free_slot_index(link, &idx) != -EBUSY),
SMC_WR_TX_WAIT_FREE_SLOT_TIME);
if (!rc) {
/* timeout - terminate connections */
smc_lgr_terminate(lgr);
smc_lgr_terminate(smc_get_lgr(link));
return -EPIPE;
}
if (idx == link->wr_tx_cnt)