linux-kernel - [PATCH v2 1/3] scsi: qla2xxx: Drop starvation counter on success

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Message-ID: <20241009111654.4697-2-a.kovaleva@yadro.com>
Date: Wed, 9 Oct 2024 14:16:52 +0300
From: Anastasia Kovaleva <a.kovaleva@...ro.com>
To: <target-devel@...r.kernel.org>
CC: <njavali@...vell.com>, <GR-QLogic-Storage-Upstream@...vell.com>,
	<James.Bottomley@...senPartnership.com>, <martin.petersen@...cle.com>,
	<bvanassche@....org>, <quinn.tran@...ium.com>, <himanshu.madhani@...ium.com>,
	<linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux@...ro.com>, <hare@...e.de>, <stable@...r.kernel.org>
Subject: [PATCH v2 1/3] scsi: qla2xxx: Drop starvation counter on success

Long-lived sessions under high load can accumulate a starvation counter,
and the current implementation does not allow this counter to be reset
during an active session.

If HBA sends correct ATIO IOCB, then it has enough resources to process
commands and we should not call ISP recovery.

Cc: stable@...r.kernel.org
Fixes: ead038556f64 ("qla2xxx: Add Dual mode support in the driver")
Signed-off-by: Anastasia Kovaleva <a.kovaleva@...ro.com>
Reviewed-by: Dmitry Bogdanov <d.bogdanov@...ro.com>
---
 drivers/scsi/qla2xxx/qla_isr.c    | 4 ++++
 drivers/scsi/qla2xxx/qla_target.c | 6 ++++++
 2 files changed, 10 insertions(+)

diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index fe98c76e9be3..5234ce0985e0 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -1959,6 +1959,10 @@ qla2x00_async_event(scsi_qla_host_t *vha, struct rsp_que *rsp, uint16_t *mb)
 		ql_dbg(ql_dbg_async, vha, 0x5091, "Transceiver Removal\n");
 		break;
 
+	case MBA_REJECTED_FCP_CMD:
+		ql_dbg(ql_dbg_async, vha, 0x5092, "LS_RJT was sent. No resources to process the ELS request.\n");
+		break;
+
 	default:
 		ql_dbg(ql_dbg_async, vha, 0x5057,
 		    "Unknown AEN:%04x %04x %04x %04x\n",
diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
index d7551b1443e4..bc6b014eb422 100644
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -6826,6 +6826,12 @@ qlt_24xx_process_atio_queue(struct scsi_qla_host *vha, uint8_t ha_locked)
 			qlt_send_term_exchange(ha->base_qpair, NULL, pkt,
 			    ha_locked, 0);
 		} else {
+			/*
+			 * If we get correct ATIO, then HBA had enough memory
+			 * to proceed without reset.
+			 */
+			WRITE_ONCE(&vha->hw->exch_starvation, 0);
+
 			qlt_24xx_atio_pkt_all_vps(vha,
 			    (struct atio_from_isp *)pkt, ha_locked);
 		}
-- 
2.40.1