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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Martin Wilck <mwilck@suse.com>
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Date: Thu, 17 Feb 2022 17:22:32 +0100
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Subject: [PATCH] libmultipath: enable linear ordering of bus/proto tuple
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We categorized protocols by bus/proto_id, while we only differentiate
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protocol IDs for SCSI. Allow transforming this into a linear sequence
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of bus/protocol IDs by having non-SCSI first, and follwing up with
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the different SCSI protocols.
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Signed-off-by: Martin Wilck <mwilck@suse.com>
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Reviewed-by: Benjamin Marzinski <bmarzins@redhat.com>
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Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>
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---
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libmultipath/structs.c | 10 ++++++++++
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libmultipath/structs.h | 14 ++++++++++++--
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2 files changed, 22 insertions(+), 2 deletions(-)
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diff --git a/libmultipath/structs.c b/libmultipath/structs.c
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index dda9884c..aaf85297 100644
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--- a/libmultipath/structs.c
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+++ b/libmultipath/structs.c
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@@ -722,3 +722,13 @@ out:
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return 0;
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}
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+
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+unsigned int bus_protocol_id(const struct path *pp) {
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+ if (!pp || pp->bus < 0 || pp->bus > SYSFS_BUS_SCSI)
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+ return SYSFS_BUS_UNDEF;
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+ if (pp->bus != SYSFS_BUS_SCSI)
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+ return pp->bus;
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+ if ((int)pp->sg_id.proto_id < 0 || pp->sg_id.proto_id > SCSI_PROTOCOL_UNSPEC)
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+ return SYSFS_BUS_UNDEF;
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+ return SYSFS_BUS_SCSI + pp->sg_id.proto_id;
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+}
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diff --git a/libmultipath/structs.h b/libmultipath/structs.h
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index a5dbad5b..5e29ae38 100644
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--- a/libmultipath/structs.h
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+++ b/libmultipath/structs.h
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@@ -57,12 +57,13 @@ enum failback_mode {
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FAILBACK_FOLLOWOVER
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};
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+/* SYSFS_BUS_SCSI should be last, see bus_protocol_id() */
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enum sysfs_buses {
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SYSFS_BUS_UNDEF,
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- SYSFS_BUS_SCSI,
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SYSFS_BUS_CCW,
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SYSFS_BUS_CCISS,
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SYSFS_BUS_NVME,
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+ SYSFS_BUS_SCSI,
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};
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enum pathstates {
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@@ -190,9 +191,18 @@ enum scsi_protocol {
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SCSI_PROTOCOL_SAS = 6,
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SCSI_PROTOCOL_ADT = 7, /* Media Changers */
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SCSI_PROTOCOL_ATA = 8,
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- SCSI_PROTOCOL_UNSPEC = 0xf, /* No specific protocol */
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+ SCSI_PROTOCOL_USB = 9, /* USB Attached SCSI (UAS), and others */
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+ SCSI_PROTOCOL_UNSPEC = 0xa, /* No specific protocol */
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};
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+/*
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+ * Linear ordering of bus/protocol
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+ * This assumes that SYSFS_BUS_SCSI is last in enum sysfs_buses
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+ * SCSI is the only bus type for which we distinguish protocols.
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+ */
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+#define LAST_BUS_PROTOCOL_ID (SYSFS_BUS_SCSI + SCSI_PROTOCOL_UNSPEC)
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+unsigned int bus_protocol_id(const struct path *pp);
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+
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enum no_undef_states {
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NU_NO = -1,
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NU_UNDEF = 0,
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