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net/smc: delete link processing as SMC server 

Add smc_llc_process_srv_delete_link() to process a DELETE_LINK request
as SMC server. 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 request LLC message and wait for the response.
No matter if a response was received, clear the deleted link 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 14:38:49 +02:00 committed by David S. Miller
parent 9c4168789c
commit 08ae27ddfb
1 changed files with 72 additions and 0 deletions
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72
net/smc/smc_llc.c
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@ -1187,6 +1187,76 @@ static void smc_llc_process_cli_delete_link(struct smc_link_group *lgr)
kfree(qentry);
}
static void smc_llc_process_srv_delete_link(struct smc_link_group *lgr)
{
struct smc_llc_msg_del_link *del_llc;
struct smc_link *lnk, *lnk_del;
struct smc_llc_qentry *qentry;
int active_links;
int i;
mutex_lock(&lgr->llc_conf_mutex);
qentry = smc_llc_flow_qentry_clr(&lgr->llc_flow_lcl);
lnk = qentry->link;
del_llc = &qentry->msg.delete_link;
if (qentry->msg.delete_link.hd.flags & SMC_LLC_FLAG_DEL_LINK_ALL) {
/* delete entire lgr */
smc_lgr_terminate_sched(lgr);
goto out;
}
/* delete single link */
lnk_del = NULL;
for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
if (lgr->lnk[i].link_id == del_llc->link_num) {
lnk_del = &lgr->lnk[i];
break;
}
}
if (!lnk_del)
goto out; /* asymmetric link already deleted */
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);
}
if (!list_empty(&lgr->list)) {
/* qentry is either a request from peer (send it back to
* initiate the DELETE_LINK processing), or a locally
* enqueued DELETE_LINK request (forward it)
*/
if (!smc_llc_send_message(lnk, &qentry->msg)) {
struct smc_llc_msg_del_link *del_llc_resp;
struct smc_llc_qentry *qentry2;
qentry2 = smc_llc_wait(lgr, lnk, SMC_LLC_WAIT_TIME,
SMC_LLC_DELETE_LINK);
if (!qentry2) {
} else {
del_llc_resp = &qentry2->msg.delete_link;
smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
}
}
}
smcr_link_clear(lnk_del);
active_links = smc_llc_active_link_count(lgr);
if (active_links == 1) {
lgr->type = SMC_LGR_SINGLE;
} else if (!active_links) {
lgr->type = SMC_LGR_NONE;
smc_lgr_terminate_sched(lgr);
}
if (lgr->type == SMC_LGR_SINGLE && !list_empty(&lgr->list)) {
/* trigger setup of asymm alt link */
/* tbd: call smc_llc_srv_add_link_local(lnk); */
}
out:
mutex_unlock(&lgr->llc_conf_mutex);
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,
@ -1200,6 +1270,8 @@ static void smc_llc_delete_link_work(struct work_struct *work)
if (lgr->role == SMC_CLNT)
smc_llc_process_cli_delete_link(lgr);
else
smc_llc_process_srv_delete_link(lgr);
out:
smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
}