IB/srp: Support SRP rev. 10 targets
There has been a change in the format of port identifiers between
revision 10 of the SRP specification and the current revision 16A.
Revision 10 specifies port identifier format as
lower 8 bytes : GUID upper 8 bytes : Extension
Whereas revision 16A specifies it as
lower 8 bytes : Extension upper 8 bytes : GUID
There are older targets (e.g. SilverStorm Virtual Fibre Channel
Bridge) which conform to revision 10 of the SRP specification.
The I/O class of revision 10 is 0xFF00 and the I/O class of revision
16A is 0x0100.
For supporting older targets, this patch:
1) Adds a new optional target creation parameter "io_class". Default
value of io_class is 0x0100 (i.e. revision 16A)
2) Uses the correct port identifier format for targets with IO class
of 0xFF00 (i.e. conforming to revision 10)
Signed-off-by: Ramachandra K <rkuchimanchi@silverstorm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index f1401e1..e7fa8b6 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -321,7 +321,29 @@
req->priv.req_it_iu_len = cpu_to_be32(srp_max_iu_len);
req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
SRP_BUF_FORMAT_INDIRECT);
- memcpy(req->priv.initiator_port_id, target->srp_host->initiator_port_id, 16);
+ /*
+ * In the published SRP specification (draft rev. 16a), the
+ * port identifier format is 8 bytes of ID extension followed
+ * by 8 bytes of GUID. Older drafts put the two halves in the
+ * opposite order, so that the GUID comes first.
+ *
+ * Targets conforming to these obsolete drafts can be
+ * recognized by the I/O Class they report.
+ */
+ if (target->io_class == SRP_REV10_IB_IO_CLASS) {
+ memcpy(req->priv.initiator_port_id,
+ target->srp_host->initiator_port_id + 8, 8);
+ memcpy(req->priv.initiator_port_id + 8,
+ target->srp_host->initiator_port_id, 8);
+ memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
+ memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
+ } else {
+ memcpy(req->priv.initiator_port_id,
+ target->srp_host->initiator_port_id, 16);
+ memcpy(req->priv.target_port_id, &target->id_ext, 8);
+ memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
+ }
+
/*
* Topspin/Cisco SRP targets will reject our login unless we
* zero out the first 8 bytes of our initiator port ID. The
@@ -334,8 +356,6 @@
(unsigned long long) be64_to_cpu(target->ioc_guid));
memset(req->priv.initiator_port_id, 0, 8);
}
- memcpy(req->priv.target_port_id, &target->id_ext, 8);
- memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
status = ib_send_cm_req(target->cm_id, &req->param);
@@ -1511,6 +1531,7 @@
SRP_OPT_SERVICE_ID = 1 << 4,
SRP_OPT_MAX_SECT = 1 << 5,
SRP_OPT_MAX_CMD_PER_LUN = 1 << 6,
+ SRP_OPT_IO_CLASS = 1 << 7,
SRP_OPT_ALL = (SRP_OPT_ID_EXT |
SRP_OPT_IOC_GUID |
SRP_OPT_DGID |
@@ -1526,6 +1547,7 @@
{ SRP_OPT_SERVICE_ID, "service_id=%s" },
{ SRP_OPT_MAX_SECT, "max_sect=%d" },
{ SRP_OPT_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
+ { SRP_OPT_IO_CLASS, "io_class=%x" },
{ SRP_OPT_ERR, NULL }
};
@@ -1610,6 +1632,21 @@
target->scsi_host->cmd_per_lun = min(token, SRP_SQ_SIZE);
break;
+ case SRP_OPT_IO_CLASS:
+ if (match_hex(args, &token)) {
+ printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p);
+ goto out;
+ }
+ if (token != SRP_REV10_IB_IO_CLASS &&
+ token != SRP_REV16A_IB_IO_CLASS) {
+ printk(KERN_WARNING PFX "unknown IO class parameter value"
+ " %x specified (use %x or %x).\n",
+ token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
+ goto out;
+ }
+ target->io_class = token;
+ break;
+
default:
printk(KERN_WARNING PFX "unknown parameter or missing value "
"'%s' in target creation request\n", p);
@@ -1652,6 +1689,7 @@
target = host_to_target(target_host);
memset(target, 0, sizeof *target);
+ target->io_class = SRP_REV16A_IB_IO_CLASS;
target->scsi_host = target_host;
target->srp_host = host;