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net/smc: introduce link group termination worker 

Use a worker for link group termination to guarantee process context.

Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
This commit is contained in:
Ursula Braun 2019-10-21 16:13:14 +02:00 committed by Jakub Kicinski
parent 2a0674fffb
commit f528ba24a8
4 changed files with 22 additions and 6 deletions
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9
net/smc/smc_core.c
View File

@ -219,6 +219,14 @@ static void smc_lgr_free_work(struct work_struct *work)
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);
}
/* create a new SMC link group */
static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
{
@ -258,6 +266,7 @@ static int smc_lgr_create(struct smc_sock *smc, struct smc_init_info *ini)
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 */

7
net/smc/smc_core.h
View File

@ -202,6 +202,7 @@ struct smc_link_group {
u8 id[SMC_LGR_ID_SIZE]; /* unique lgr id */
struct delayed_work free_work; /* delayed freeing of an lgr */
struct work_struct terminate_work; /* abnormal lgr termination */
u8 sync_err : 1; /* lgr no longer fits to peer */
u8 terminating : 1;/* lgr is terminating */
u8 freefast : 1; /* free worker scheduled fast */
@ -282,6 +283,12 @@ static inline struct smc_connection *smc_lgr_find_conn(
return res;
}
static inline void smc_lgr_terminate_sched(struct smc_link_group *lgr)
{
if (!lgr->terminating)
schedule_work(&lgr->terminate_work);
}
struct smc_sock;
struct smc_clc_msg_accept_confirm;
struct smc_clc_msg_local;

2
net/smc/smc_llc.c
View File

@ -475,7 +475,7 @@ static void smc_llc_rx_delete_link(struct smc_link *link,
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);
smc_lgr_terminate_sched(lgr);
}
}

10
net/smc/smc_wr.c
View File

@ -101,7 +101,7 @@ static inline void smc_wr_tx_process_cqe(struct ib_wc *wc)
clear_bit(i, link->wr_tx_mask);
}
/* terminate connections of this link group abnormally */
smc_lgr_terminate(smc_get_lgr(link));
smc_lgr_terminate_sched(smc_get_lgr(link));
}
if (pnd_snd.handler)
pnd_snd.handler(&pnd_snd.priv, link, wc->status);
@ -191,7 +191,7 @@ int smc_wr_tx_get_free_slot(struct smc_link *link,
SMC_WR_TX_WAIT_FREE_SLOT_TIME);
if (!rc) {
/* timeout - terminate connections */
smc_lgr_terminate(smc_get_lgr(link));
smc_lgr_terminate_sched(smc_get_lgr(link));
return -EPIPE;
}
if (idx == link->wr_tx_cnt)
@ -247,7 +247,7 @@ int smc_wr_tx_send(struct smc_link *link, struct smc_wr_tx_pend_priv *priv)
rc = ib_post_send(link->roce_qp, &link->wr_tx_ibs[pend->idx], NULL);
if (rc) {
smc_wr_tx_put_slot(link, priv);
smc_lgr_terminate(smc_get_lgr(link));
smc_lgr_terminate_sched(smc_get_lgr(link));
}
return rc;
}
@ -272,7 +272,7 @@ int smc_wr_reg_send(struct smc_link *link, struct ib_mr *mr)
SMC_WR_REG_MR_WAIT_TIME);
if (!rc) {
/* timeout - terminate connections */
smc_lgr_terminate(smc_get_lgr(link));
smc_lgr_terminate_sched(smc_get_lgr(link));
return -EPIPE;
}
if (rc == -ERESTARTSYS)
@ -373,7 +373,7 @@ static inline void smc_wr_rx_process_cqes(struct ib_wc wc[], int num)
/* terminate connections of this link group
* abnormally
*/
smc_lgr_terminate(smc_get_lgr(link));
smc_lgr_terminate_sched(smc_get_lgr(link));
break;
default:
smc_wr_rx_post(link); /* refill WR RX */