net/smc: take link down instead of terminating the link group

Use the introduced link down processing in all places where the link
group is terminated and take down the affected link only.
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>

net/smc/smc_core.c

@@ -884,11 +884,8 @@ void smc_smcr_terminate_all(struct smc_ib_device *smcibdev)
 	} else {
 		list_for_each_entry_safe(lgr, lg, &smc_lgr_list.list, list) {
 			for (i = 0; i < SMC_LINKS_PER_LGR_MAX; i++) {
-				if (lgr->lnk[i].smcibdev == smcibdev) {
-					list_move(&lgr->list, &lgr_free_list);
-					lgr->freeing = 1;
-					break;
-				}
+				if (lgr->lnk[i].smcibdev == smcibdev)
+					smcr_link_down_cond_sched(&lgr->lnk[i]);
 			}
 		}
 	}

net/smc/smc_llc.c

@@ -556,7 +556,7 @@ static void smc_llc_rx_delete_link(struct smc_link *link,
 		smc_llc_send_delete_link(link, 0, SMC_LLC_RESP, true,
 					 SMC_LLC_DEL_PROG_INIT_TERM);
 	}
-	smc_lgr_terminate_sched(lgr);
+	smcr_link_down_cond(link);
 }
 
 /* process a confirm_rkey request from peer, remote flow */
@@ -831,7 +831,7 @@ static void smc_llc_testlink_work(struct work_struct *work)
 	if (link->state != SMC_LNK_ACTIVE)
 		return;		/* link state changed */
 	if (rc <= 0) {
-		smc_lgr_terminate_sched(smc_get_lgr(link));
+		smcr_link_down_cond_sched(link);
 		return;
 	}
 	next_interval = link->llc_testlink_time;

net/smc/smc_tx.c

@@ -283,7 +283,7 @@ static int smc_tx_rdma_write(struct smc_connection *conn, int peer_rmbe_offset,
 	rdma_wr->rkey = lgr->rtokens[conn->rtoken_idx][link->link_idx].rkey;
 	rc = ib_post_send(link->roce_qp, &rdma_wr->wr, NULL);
 	if (rc)
-		smc_lgr_terminate_sched(lgr);
+		smcr_link_down_cond_sched(link);
 	return rc;
 }
 

net/smc/smc_wr.c

@@ -120,8 +120,8 @@ static inline void smc_wr_tx_process_cqe(struct ib_wc *wc)
 			       sizeof(link->wr_tx_bufs[i]));
 			clear_bit(i, link->wr_tx_mask);
 		}
-		/* terminate connections of this link group abnormally */
-		smc_lgr_terminate_sched(smc_get_lgr(link));
+		/* terminate link */
+		smcr_link_down_cond_sched(link);
 	}
 	if (pnd_snd.handler)
 		pnd_snd.handler(&pnd_snd.priv, link, wc->status);
@@ -212,8 +212,8 @@ int smc_wr_tx_get_free_slot(struct smc_link *link,
 			(smc_wr_tx_get_free_slot_index(link, &idx) != -EBUSY),
 			SMC_WR_TX_WAIT_FREE_SLOT_TIME);
 		if (!rc) {
-			/* timeout - terminate connections */
-			smc_lgr_terminate_sched(lgr);
+			/* timeout - terminate link */
+			smcr_link_down_cond_sched(link);
 			return -EPIPE;
 		}
 		if (idx == link->wr_tx_cnt)
@@ -270,7 +270,7 @@ 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_sched(smc_get_lgr(link));
+		smcr_link_down_cond_sched(link);
 	}
 	return rc;
 }
@@ -294,8 +294,8 @@ int smc_wr_reg_send(struct smc_link *link, struct ib_mr *mr)
 					      (link->wr_reg_state != POSTED),
 					      SMC_WR_REG_MR_WAIT_TIME);
 	if (!rc) {
-		/* timeout - terminate connections */
-		smc_lgr_terminate_sched(smc_get_lgr(link));
+		/* timeout - terminate link */
+		smcr_link_down_cond_sched(link);
 		return -EPIPE;
 	}
 	if (rc == -ERESTARTSYS)
@@ -393,10 +393,7 @@ static inline void smc_wr_rx_process_cqes(struct ib_wc wc[], int num)
 			case IB_WC_RETRY_EXC_ERR:
 			case IB_WC_RNR_RETRY_EXC_ERR:
 			case IB_WC_WR_FLUSH_ERR:
-				/* terminate connections of this link group
-				 * abnormally
-				 */
-				smc_lgr_terminate_sched(smc_get_lgr(link));
+				smcr_link_down_cond_sched(link);
 				break;
 			default:
 				smc_wr_rx_post(link); /* refill WR RX */