git: 7e321b97917d - stable/13 - cam(4): Limit search for disks in SES enclosure by single bus

The branch stable/13 has been updated by mav:

URL: https://cgit.FreeBSD.org/src/commit/?id=7e321b97917dce5274972a6bc5eee94c6ad4cfc4

commit 7e321b97917dce5274972a6bc5eee94c6ad4cfc4
Author:     Alexander Motin <mav@FreeBSD.org>
AuthorDate: 2021-10-05 19:01:16 +0000
Commit:     Alexander Motin <mav@FreeBSD.org>
CommitDate: 2021-10-19 15:06:52 +0000

    cam(4): Limit search for disks in SES enclosure by single bus
    
    At least for SAS that we only support now disks are typically
    connected to the same bus as the enclosure.  Limiting the search
    scope makes it much faster on systems with multiple buses and
    thousands of disks.
    
    Reviewed by:    imp
    MFC after:      2 weeks
    Sponsored by:   iXsystems, Inc.
    Differential Revision:  https://reviews.freebsd.org/D32305
    
    (cherry picked from commit 730ea72c706ef8e025616772cfd86fd89ed3d42e)
---
 sys/cam/scsi/scsi_enc_ses.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sys/cam/scsi/scsi_enc_ses.c b/sys/cam/scsi/scsi_enc_ses.c
index 014fe9fcd525..d20f3dec4e52 100644
--- a/sys/cam/scsi/scsi_enc_ses.c
+++ b/sys/cam/scsi/scsi_enc_ses.c
@@ -374,6 +374,10 @@ typedef struct ses_softc {
 	ses_control_reqlist_t	ses_pending_requests;
 } ses_softc_t;
 
+static int ses_search_globally = 0;
+SYSCTL_INT(_kern_cam_enc, OID_AUTO, search_globally, CTLFLAG_RWTUN,
+           &ses_search_globally, 0, "Search for disks on other buses");
+
 /**
  * \brief Reset a SES iterator to just before the first element
  *        in the configuration.
@@ -890,6 +894,10 @@ ses_path_iter_devid_callback(enc_softc_t *enc, enc_element_t *elem,
 	  + devid->length;
 	memcpy(device_pattern->data.devid_pat.id, devid,
 	       device_pattern->data.devid_pat.id_len);
+	if (!ses_search_globally) {
+		device_pattern->flags |= DEV_MATCH_PATH;
+		device_pattern->path_id = xpt_path_path_id(enc->periph->path);
+	}
 
 	memset(&cdm, 0, sizeof(cdm));
 	if (xpt_create_path(&cdm.ccb_h.path, /*periph*/NULL,