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IB/srp: Support SRP rev. 10 targets

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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>
This commit is contained in:
Ramachandra K 2006-06-17 20:37:38 -07:00 committed by Roland Dreier
parent 73c0996b1c
commit 0c0450db31
2 changed files with 42 additions and 3 deletions
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44
drivers/infiniband/ulp/srp/ib_srp.c
View File

@ -321,7 +321,29 @@ static int srp_send_req(struct srp_target_port *target)
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 @@ static int srp_send_req(struct srp_target_port *target)
(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 @@ enum {
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 @@ static match_table_t srp_opt_tokens = {
{ 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 @@ static int srp_parse_options(const char *buf, struct srp_target_port *target)
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 @@ static ssize_t srp_create_target(struct class_device *class_dev,
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;

1
drivers/infiniband/ulp/srp/ib_srp.h
View File

@ -122,6 +122,7 @@ struct srp_target_port {
__be64 id_ext;
__be64 ioc_guid;
__be64 service_id;
u16 io_class;
struct srp_host *srp_host;
struct Scsi_Host *scsi_host;
char target_name[32];