linux-kernel - [PATCH 5.19 0624/1157] scsi: qla2xxx: edif: Reduce N2N thrashing at app

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Date:   Mon, 15 Aug 2022 19:59:40 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Himanshu Madhani <himanshu.madhani@...cle.com>,
        Quinn Tran <qutran@...vell.com>,
        Nilesh Javali <njavali@...vell.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.19 0624/1157] scsi: qla2xxx: edif: Reduce N2N thrashing at app_start time

From: Quinn Tran <qutran@...vell.com>

[ Upstream commit 37be3f9d6993a721bc019f03c97ea0fe66319997 ]

For N2N + remote WWPN is bigger than local adapter, remote adapter will
login to local adapter while authentication application is not running.
When authentication application starts, the current session in FW needs to
to be invalidated.

Make sure the old session is torn down before triggering a relogin.

Link: https://lore.kernel.org/r/20220608115849.16693-9-njavali@marvell.com
Fixes: 4de067e5df12 ("scsi: qla2xxx: edif: Add N2N support for EDIF")
Reviewed-by: Himanshu Madhani <himanshu.madhani@...cle.com>
Signed-off-by: Quinn Tran <qutran@...vell.com>
Signed-off-by: Nilesh Javali <njavali@...vell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/qla2xxx/qla_edif.c | 47 ++++++++++++++++++++++++---------
 1 file changed, 34 insertions(+), 13 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_edif.c b/drivers/scsi/qla2xxx/qla_edif.c
index 7239439120c0..ee8931392ce2 100644
--- a/drivers/scsi/qla2xxx/qla_edif.c
+++ b/drivers/scsi/qla2xxx/qla_edif.c
@@ -517,11 +517,28 @@ qla_edif_app_start(scsi_qla_host_t *vha, struct bsg_job *bsg_job)
 		list_for_each_entry_safe(fcport, tf, &vha->vp_fcports, list)
 			fcport->n2n_link_reset_cnt = 0;
 
-		if (vha->hw->flags.n2n_fw_acc_sec)
-			set_bit(N2N_LINK_RESET, &vha->dpc_flags);
-		else
+		if (vha->hw->flags.n2n_fw_acc_sec) {
+			list_for_each_entry_safe(fcport, tf, &vha->vp_fcports, list)
+				qla_edif_sa_ctl_init(vha, fcport);
+
+			/*
+			 * While authentication app was not running, remote device
+			 * could still try to login with this local port.  Let's
+			 * clear the state and try again.
+			 */
+			qla2x00_wait_for_sess_deletion(vha);
+
+			/* bounce the link to get the other guy to relogin */
+			if (!vha->hw->flags.n2n_bigger) {
+				set_bit(N2N_LINK_RESET, &vha->dpc_flags);
+				qla2xxx_wake_dpc(vha);
+			}
+		} else {
+			qla2x00_wait_for_hba_online(vha);
 			set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
-		qla2xxx_wake_dpc(vha);
+			qla2xxx_wake_dpc(vha);
+			qla2x00_wait_for_hba_online(vha);
+		}
 	} else {
 		list_for_each_entry_safe(fcport, tf, &vha->vp_fcports, list) {
 			ql_dbg(ql_dbg_edif, vha, 0x2058,
@@ -920,17 +937,21 @@ qla_edif_app_getfcinfo(scsi_qla_host_t *vha, struct bsg_job *bsg_job)
 			if (tdid.b24 != 0 && tdid.b24 != fcport->d_id.b24)
 				continue;
 
-			if (fcport->scan_state != QLA_FCPORT_FOUND)
-				continue;
+			if (!N2N_TOPO(vha->hw)) {
+				if (fcport->scan_state != QLA_FCPORT_FOUND)
+					continue;
 
-			if (fcport->port_type == FCT_UNKNOWN && !fcport->fc4_features)
-				rval = qla24xx_async_gffid(vha, fcport, true);
+				if (fcport->port_type == FCT_UNKNOWN &&
+				    !fcport->fc4_features)
+					rval = qla24xx_async_gffid(vha, fcport,
+								   true);
 
-			if (!rval &&
-			    !(fcport->fc4_features & FC4_FF_TARGET ||
-			      fcport->port_type &
-			      (FCT_TARGET | FCT_NVME_TARGET)))
-				continue;
+				if (!rval &&
+				    !(fcport->fc4_features & FC4_FF_TARGET ||
+				      fcport->port_type &
+				      (FCT_TARGET | FCT_NVME_TARGET)))
+					continue;
+			}
 
 			rval = 0;
 
-- 
2.35.1