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net/smc: improve termination processing

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Add helper smcr_lgr_link_deactivate_all() and eliminate duplicate code.
In smc_lgr_free(), clear the smc-r links before smc_lgr_free_bufs() is
called so buffers are already prepared for free. The usage of the soft
parameter in __smc_lgr_terminate() is no longer needed, smc_lgr_free()
can be called directly. smc_lgr_terminate_sched() and
smc_smcd_terminate() set lgr->freeing to indicate that the link group
will be freed soon to avoid unnecessary schedules of the free worker.

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 2020-05-04 14:18:46 +02:00 committed by David S. Miller
parent 3e0c40afce
commit a52bcc919b
1 changed files with 31 additions and 30 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

61
net/smc/smc_core.c
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@ -237,6 +237,19 @@ void smc_lgr_cleanup_early(struct smc_connection *conn)
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_interruptible_all(&lgr->llc_waiter);
}
static void smc_lgr_free(struct smc_link_group *lgr);
static void smc_lgr_free_work(struct work_struct *work)
@ -246,7 +259,6 @@ static void smc_lgr_free_work(struct work_struct *work)
free_work);
spinlock_t *lgr_lock;
bool conns;
int i;
smc_lgr_list_head(lgr, &lgr_lock);
spin_lock_bh(lgr_lock);
@ -271,15 +283,8 @@ static void smc_lgr_free_work(struct work_struct *work)
SMC_LLC_DEL_PROG_INIT_TERM);
if (lgr->is_smcd && !lgr->terminating)
smc_ism_signal_shutdown(lgr);
if (!lgr->is_smcd) {
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_interruptible_all(&lgr->llc_waiter);
}
if (!lgr->is_smcd)
smcr_lgr_link_deactivate_all(lgr);
smc_lgr_free(lgr);
}
@ -802,6 +807,16 @@ 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]);
}
mutex_unlock(&lgr->llc_conf_mutex);
smc_llc_lgr_clear(lgr);
}
smc_lgr_free_bufs(lgr);
if (lgr->is_smcd) {
if (!lgr->terminating) {
@ -811,11 +826,6 @@ static void smc_lgr_free(struct smc_link_group *lgr)
if (!atomic_dec_return(&lgr->smcd->lgr_cnt))
wake_up(&lgr->smcd->lgrs_deleted);
} else {
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
if (lgr->lnk[i].state != SMC_LNK_UNUSED)
smcr_link_clear(&lgr->lnk[i]);
}
smc_llc_lgr_clear(lgr);
if (!atomic_dec_return(&lgr_cnt))
wake_up(&lgrs_deleted);
}
@ -870,8 +880,6 @@ static void smc_conn_kill(struct smc_connection *conn, bool soft)
static void smc_lgr_cleanup(struct smc_link_group *lgr)
{
int i;
if (lgr->is_smcd) {
smc_ism_signal_shutdown(lgr);
smcd_unregister_all_dmbs(lgr);
@ -883,13 +891,7 @@ static void smc_lgr_cleanup(struct smc_link_group *lgr)
if (!rsn)
rsn = SMC_LLC_DEL_PROG_INIT_TERM;
smc_llc_send_link_delete_all(lgr, false, rsn);
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_interruptible_all(&lgr->llc_waiter);
smcr_lgr_link_deactivate_all(lgr);
}
}
@ -905,8 +907,8 @@ static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft)
if (lgr->terminating)
return; /* lgr already terminating */
if (!soft)
cancel_delayed_work_sync(&lgr->free_work);
/* 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 */
@ -926,10 +928,7 @@ static void __smc_lgr_terminate(struct smc_link_group *lgr, bool soft)
}
read_unlock_bh(&lgr->conns_lock);
smc_lgr_cleanup(lgr);
if (soft)
smc_lgr_schedule_free_work_fast(lgr);
else
smc_lgr_free(lgr);
smc_lgr_free(lgr);
}
/* unlink link group and schedule termination */
@ -944,6 +943,7 @@ void smc_lgr_terminate_sched(struct smc_link_group *lgr)
return; /* lgr already terminating */
}
list_del_init(&lgr->list);
lgr->freeing = 1;
spin_unlock_bh(lgr_lock);
schedule_work(&lgr->terminate_work);
}
@ -962,6 +962,7 @@ void smc_smcd_terminate(struct smcd_dev *dev, u64 peer_gid, unsigned short 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);