linux-kernel - [PATCH AUTOSEL 6.1 38/42] scsi: lpfc: Add ELS_RSP cmd to the list of WQEs to flush in lpfc_els_flush

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Message-ID: <20241004182718.3673735-38-sashal@kernel.org>
Date: Fri,  4 Oct 2024 14:26:49 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Justin Tee <justin.tee@...adcom.com>,
	"Martin K . Petersen" <martin.petersen@...cle.com>,
	Sasha Levin <sashal@...nel.org>,
	james.smart@...adcom.com,
	dick.kennedy@...adcom.com,
	James.Bottomley@...senPartnership.com,
	linux-scsi@...r.kernel.org
Subject: [PATCH AUTOSEL 6.1 38/42] scsi: lpfc: Add ELS_RSP cmd to the list of WQEs to flush in lpfc_els_flush_cmd()

From: Justin Tee <justin.tee@...adcom.com>

[ Upstream commit 93bcc5f3984bf4f51da1529700aec351872dbfff ]

During HBA stress testing, a spam of received PLOGIs exposes a resource
recovery bug causing leakage of lpfc_sqlq entries from the global
phba->sli4_hba.lpfc_els_sgl_list.

The issue is in lpfc_els_flush_cmd(), where the driver attempts to recover
outstanding ELS sgls when walking the txcmplq.  Only CMD_ELS_REQUEST64_CRs
and CMD_GEN_REQUEST64_CRs are added to the abort and cancel lists.  A check
for CMD_XMIT_ELS_RSP64_WQE is missing in order to recover LS_ACC usages of
the phba->sli4_hba.lpfc_els_sgl_list too.

Fix by adding CMD_XMIT_ELS_RSP64_WQE as part of the txcmplq walk when
adding WQEs to the abort and cancel list in lpfc_els_flush_cmd().  Also,
update naming convention from CRs to WQEs.

Signed-off-by: Justin Tee <justin.tee@...adcom.com>
Link: https://lore.kernel.org/r/20240912232447.45607-2-justintee8345@gmail.com
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/lpfc/lpfc_els.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/lpfc/lpfc_els.c b/drivers/scsi/lpfc/lpfc_els.c
index 05764008f6e70..0b1a81ac24765 100644
--- a/drivers/scsi/lpfc/lpfc_els.c
+++ b/drivers/scsi/lpfc/lpfc_els.c
@@ -9450,11 +9450,12 @@ lpfc_els_flush_cmd(struct lpfc_vport *vport)
 		if (piocb->cmd_flag & LPFC_DRIVER_ABORTED && !mbx_tmo_err)
 			continue;
 
-		/* On the ELS ring we can have ELS_REQUESTs or
-		 * GEN_REQUESTs waiting for a response.
+		/* On the ELS ring we can have ELS_REQUESTs, ELS_RSPs,
+		 * or GEN_REQUESTs waiting for a CQE response.
 		 */
 		ulp_command = get_job_cmnd(phba, piocb);
-		if (ulp_command == CMD_ELS_REQUEST64_CR) {
+		if (ulp_command == CMD_ELS_REQUEST64_WQE ||
+		    ulp_command == CMD_XMIT_ELS_RSP64_WQE) {
 			list_add_tail(&piocb->dlist, &abort_list);
 
 			/* If the link is down when flushing ELS commands
-- 
2.43.0