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authorJames Smart <jsmart2021@gmail.com>2021-05-14 22:55:57 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2021-05-22 06:23:28 +0300
commit3e49af9393c6e59d579de13333514fc9660a0e92 (patch)
treee12ac2a194baa2e8a1f2a738ddc21258e2b88957 /drivers/scsi/lpfc/lpfc_attr.c
parent5aa615d195f1e142c662cb2253f057c9baec7531 (diff)
downloadlinux-3e49af9393c6e59d579de13333514fc9660a0e92.tar.xz
scsi: lpfc: Add a option to enable interlocked ABTS before job completion
Default behavior for the driver, when aborting an I/O, is to terminate the I/O with the adapter. The adapter will initiate an ABTS to terminate the exchange on the link and mark the exchange is terminated so that no further use of the sgl or any traffic for the exchange is worked on. Completion on the Abort is then posted to the driver, which as the I/O is terminated can complete the I/O to the OS. This completion may occur prior to the ABTS handshake completing on the wire. The ABTS handshake can take a long time to complete with timeouts and retries reaching 60+ seconds. Note: if retries fail, LOGO occurs. Some devices want to ensure that the ABTS handshake fully completes (this device has fully ack'd it) before the I/O completion is posted back to the OS, where a failed I/O may be retried via a different path. To support this behavior, an option was added to the driver to change I/O completion from the Abort cmd completion to the Exchange termination (aka ABTS) completion. Link: https://lore.kernel.org/r/20210514195559.119853-10-jsmart2021@gmail.com Co-developed-by: Justin Tee <justin.tee@broadcom.com> Signed-off-by: Justin Tee <justin.tee@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/lpfc/lpfc_attr.c')
-rw-r--r--drivers/scsi/lpfc/lpfc_attr.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/scsi/lpfc/lpfc_attr.c b/drivers/scsi/lpfc/lpfc_attr.c
index 0975a8b252a0..c5e96cb904c8 100644
--- a/drivers/scsi/lpfc/lpfc_attr.c
+++ b/drivers/scsi/lpfc/lpfc_attr.c
@@ -3449,6 +3449,15 @@ LPFC_ATTR_R(fcf_failover_policy, 1, 1, 2,
"FCF Fast failover=1 Priority failover=2");
/*
+ * lpfc_fcp_wait_abts_rsp: Modifies criteria for reporting completion of
+ * aborted IO.
+ * The range is [0,1]. Default value is 0
+ * 0, IO completes after ABTS issued (default).
+ * 1, IO completes after receipt of ABTS response or timeout.
+ */
+LPFC_ATTR_R(fcp_wait_abts_rsp, 0, 0, 1, "Wait for FCP ABTS completion");
+
+/*
# lpfc_enable_rrq: Track XRI/OXID reuse after IO failures
# 0x0 = disabled, XRI/OXID use not tracked.
# 0x1 = XRI/OXID reuse is timed with ratov, RRQ sent.
@@ -6205,6 +6214,7 @@ struct device_attribute *lpfc_hba_attrs[] = {
&dev_attr_lpfc_enable_npiv,
&dev_attr_lpfc_fcf_failover_policy,
&dev_attr_lpfc_enable_rrq,
+ &dev_attr_lpfc_fcp_wait_abts_rsp,
&dev_attr_nport_evt_cnt,
&dev_attr_board_mode,
&dev_attr_max_vpi,
@@ -7332,6 +7342,7 @@ lpfc_get_cfgparam(struct lpfc_hba *phba)
lpfc_enable_npiv_init(phba, lpfc_enable_npiv);
lpfc_fcf_failover_policy_init(phba, lpfc_fcf_failover_policy);
lpfc_enable_rrq_init(phba, lpfc_enable_rrq);
+ lpfc_fcp_wait_abts_rsp_init(phba, lpfc_fcp_wait_abts_rsp);
lpfc_fdmi_on_init(phba, lpfc_fdmi_on);
lpfc_enable_SmartSAN_init(phba, lpfc_enable_SmartSAN);
lpfc_use_msi_init(phba, lpfc_use_msi);