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net/smc: delete link processing as SMC client 

Add smc_llc_process_cli_delete_link() to process a DELETE_LINK request
as SMC client. When the request is to delete ALL links then terminate
the whole link group. If not, find the link to delete by its link_id,
send the DELETE_LINK response LLC message and then clear the deleted
link. Finally determine and update the link group state.

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 14:38:48 +02:00 committed by David S. Miller
parent 9ec6bf19ec
commit 9c4168789c
1 changed files with 72 additions and 0 deletions
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72
net/smc/smc_llc.c
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@ -863,6 +863,18 @@ static void smc_llc_process_cli_add_link(struct smc_link_group *lgr)
mutex_unlock(&lgr->llc_conf_mutex);
}
static int smc_llc_active_link_count(struct smc_link_group *lgr)
{
int i, link_count = 0;
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
if (!smc_link_usable(&lgr->lnk[i]))
continue;
link_count++;
}
return link_count;
}
/* find the asymmetric link when 3 links are established */
static struct smc_link *smc_llc_find_asym_link(struct smc_link_group *lgr)
{
@ -1118,6 +1130,63 @@ static void smc_llc_add_link_work(struct work_struct *work)
smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
}
static void smc_llc_process_cli_delete_link(struct smc_link_group *lgr)
{
struct smc_link *lnk_del = NULL, *lnk_asym, *lnk;
struct smc_llc_msg_del_link *del_llc;
struct smc_llc_qentry *qentry;
int active_links;
int lnk_idx;
qentry = smc_llc_flow_qentry_clr(&lgr->llc_flow_lcl);
lnk = qentry->link;
del_llc = &qentry->msg.delete_link;
if (del_llc->hd.flags & SMC_LLC_FLAG_DEL_LINK_ALL) {
smc_lgr_terminate_sched(lgr);
goto out;
}
mutex_lock(&lgr->llc_conf_mutex);
/* delete single link */
for (lnk_idx = 0; lnk_idx < SMC_LINKS_PER_LGR_MAX; lnk_idx++) {
if (lgr->lnk[lnk_idx].link_id != del_llc->link_num)
continue;
lnk_del = &lgr->lnk[lnk_idx];
break;
}
del_llc->hd.flags |= SMC_LLC_FLAG_RESP;
if (!lnk_del) {
/* link was not found */
del_llc->reason = htonl(SMC_LLC_DEL_NOLNK);
smc_llc_send_message(lnk, &qentry->msg);
goto out_unlock;
}
lnk_asym = smc_llc_find_asym_link(lgr);
del_llc->reason = 0;
smc_llc_send_message(lnk, &qentry->msg); /* response */
if (smc_link_downing(&lnk_del->state)) {
/* tbd: call smc_switch_conns(lgr, lnk_del, false); */
smc_wr_tx_wait_no_pending_sends(lnk_del);
}
smcr_link_clear(lnk_del);
active_links = smc_llc_active_link_count(lgr);
if (lnk_del == lnk_asym) {
/* expected deletion of asym link, don't change lgr state */
} else if (active_links == 1) {
lgr->type = SMC_LGR_SINGLE;
} else if (!active_links) {
lgr->type = SMC_LGR_NONE;
smc_lgr_terminate_sched(lgr);
}
out_unlock:
mutex_unlock(&lgr->llc_conf_mutex);
out:
kfree(qentry);
}
static void smc_llc_delete_link_work(struct work_struct *work)
{
struct smc_link_group *lgr = container_of(work, struct smc_link_group,
@ -1128,6 +1197,9 @@ static void smc_llc_delete_link_work(struct work_struct *work)
smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
goto out;
}
if (lgr->role == SMC_CLNT)
smc_llc_process_cli_delete_link(lgr);
out:
smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
}