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>
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@ -1187,6 +1187,76 @@ out:
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kfree(qentry);
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}
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static void smc_llc_process_srv_delete_link(struct smc_link_group *lgr)
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{
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struct smc_llc_msg_del_link *del_llc;
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struct smc_link *lnk, *lnk_del;
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struct smc_llc_qentry *qentry;
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int active_links;
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int i;
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mutex_lock(&lgr->llc_conf_mutex);
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qentry = smc_llc_flow_qentry_clr(&lgr->llc_flow_lcl);
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lnk = qentry->link;
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del_llc = &qentry->msg.delete_link;
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if (qentry->msg.delete_link.hd.flags & SMC_LLC_FLAG_DEL_LINK_ALL) {
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/* delete entire lgr */
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smc_lgr_terminate_sched(lgr);
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goto out;
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}
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/* delete single link */
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lnk_del = NULL;
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for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
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if (lgr->lnk[i].link_id == del_llc->link_num) {
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lnk_del = &lgr->lnk[i];
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break;
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}
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}
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if (!lnk_del)
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goto out; /* asymmetric link already deleted */
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if (smc_link_downing(&lnk_del->state)) {
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/* tbd: call smc_switch_conns(lgr, lnk_del, false); */
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smc_wr_tx_wait_no_pending_sends(lnk_del);
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}
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if (!list_empty(&lgr->list)) {
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/* qentry is either a request from peer (send it back to
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* initiate the DELETE_LINK processing), or a locally
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* enqueued DELETE_LINK request (forward it)
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*/
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if (!smc_llc_send_message(lnk, &qentry->msg)) {
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struct smc_llc_msg_del_link *del_llc_resp;
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struct smc_llc_qentry *qentry2;
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qentry2 = smc_llc_wait(lgr, lnk, SMC_LLC_WAIT_TIME,
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SMC_LLC_DELETE_LINK);
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if (!qentry2) {
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} else {
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del_llc_resp = &qentry2->msg.delete_link;
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smc_llc_flow_qentry_del(&lgr->llc_flow_lcl);
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}
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}
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}
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smcr_link_clear(lnk_del);
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active_links = smc_llc_active_link_count(lgr);
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if (active_links == 1) {
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lgr->type = SMC_LGR_SINGLE;
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} else if (!active_links) {
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lgr->type = SMC_LGR_NONE;
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smc_lgr_terminate_sched(lgr);
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}
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if (lgr->type == SMC_LGR_SINGLE && !list_empty(&lgr->list)) {
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/* trigger setup of asymm alt link */
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/* tbd: call smc_llc_srv_add_link_local(lnk); */
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}
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out:
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mutex_unlock(&lgr->llc_conf_mutex);
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kfree(qentry);
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}
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static void smc_llc_delete_link_work(struct work_struct *work)
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{
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struct smc_link_group *lgr = container_of(work, struct smc_link_group,
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@ -1200,6 +1270,8 @@ static void smc_llc_delete_link_work(struct work_struct *work)
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if (lgr->role == SMC_CLNT)
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smc_llc_process_cli_delete_link(lgr);
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else
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smc_llc_process_srv_delete_link(lgr);
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out:
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smc_llc_flow_stop(lgr, &lgr->llc_flow_lcl);
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}
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