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Date: Mon, 30 Mar 2009 20:46:17 -0700
From: "Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To: dgilbert@...erlog.com
Cc: LKML <linux-kernel@...r.kernel.org>,
linux-scsi <linux-scsi@...r.kernel.org>,
Brad Fennell <wavebender@...mail.com>,
Jason Hodges <jasonahodges@...il.com>,
Rafiu Fakunle <rafiu@...nfiler.com>
Subject: Re: Subject: [PATCH] [Target_Core_Mod]: Add EVPD 0x83 NAA
Registered Extended Assigned identifer support
On Sun, 2009-03-29 at 12:09 -0400, Douglas Gilbert wrote:
> Nicholas A. Bellinger wrote:
> > Greetings all,
> >
> > This patch adds emulation for EVPD 0x83 NAA identifier type (0x3) Registered
> > Extended Assigned format (0x6) from spc4r17 section 7.7.3.6.5. The WWN value
> > is based on the emulated Unit Serial Number supplied via ConfigFS into
> > /sys/kernel/config/target/core/$HBA/$DEV/wwn/evpd_unit_serial for a
> > given storage object.
>
> Nicholas,
> May I suggest:
> s/evpd_unit_serial/vpd_unit_serial/
>
> The "E" in EVPD stands for "enable" and should be used to
> refer to bit 0, byte 1 in the SCSI INQUIRY command block
> (cdb). So together with the page code field (byte 2 of the
> cdb) that forms a so-called "non-standard" INQUIRY requesting
> a VPD page. I think all other usages should prefer "VPD"
> or "vpd" (for "vital product data").
>
> My sg3_utils package is partially responsible for the misuse
> of EVPD and I have been slowly converting such instances
> to VPD (hopefully I just stamped out the final ones).
>
Hi Doug,
I always assumed the "E" meant Extended wrt SPC, but after looking at
spc4r17 I noticed that only page code 0x86 (and not 0x83) actually
refers to the Extended VPD page.
This sounds like a good suggestion to me, and I will go ahead and make
the change. Thank you for your input!
--nab
> Doug Gilbert
>
> > This patch expects evpd_unit_serial to be in hex. The first 24 bytes of
> > evpd_unit_serial is then encoded in binary hex starting at the
> > VENDOR_SPECIFIC_IDENTIFIER (36-bit) and VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
> > (64-bit) fields of the NAA identifier.
> >
> > This patch also uses the OpenFabrics OUI (001405) for the IEEE Company ID
> > field of the NAA identifier. Note that the NAA (0x3) identifer is a requirement
> > for logical unit WWN on certain iSCSI capable cluster clients.
> >
> > These patches are made against lio-core-2.6.git/master and tested on
> > v2.6.29 x86 32-bit HVM using sg_inq from sg3_utils. The lio-core-2.6.git tree
> > can be found at:
> >
> > http://git.kernel.org/?p=linux/kernel/git/nab/lio-core-2.6.git;a=summary
> >
> > Here is what it looks like:
> >
> > *) Set WWN value to target_core_mod/IBLOCK exported Linux LVM blockdevice
> >
> > echo a97e4ce21c0711de829b000c2943d57b > $TARGET/iblock_0/lvm_test0/wwn/evpd_unit_serial
> >
> > *) From target_core_mod side kernel buffer
> >
> > IBLOCK: Created bio_set() for major/minor: 254:2
> > iblock: Using SPC3_PERSISTENT_RESERVATIONS emulation
> > iblock: Enabling ALUA Emulation for SPC-3 device
> > iblock: Adding to default ALUA LU Group: core/alua/lu_gps/default_lu_gp
> > CORE_iBLOCK[0] - Activating Device with TCQ: 0 at Major: 254 Minor 2
> > Vendor: LIO-ORG Model: IBLOCK Revision: 3.0
> > Type: Direct-Access ANSI SCSI revision: 05
> > T10 EVPD Unit Serial Number: a97e4ce21c0711de829b000c2943d57b
> > T10 EVPD Page Length: 72
> > T10 EVPD Identifer Length: 16
> > T10 EVPD Identifier Association: addressed logical unit
> > T10 EVPD Identifier Type: NAA
> > T10 EVPD Binary Device Identifier: 36001405a97e4ce21c0711de829b000c2
> >
> > *) From Open/iSCSI initiator side using sg_inq
> >
> > initiator#~# sg_inq -p 0x83 -v /dev/sde
> > VPD INQUIRY: Device Identification page
> > inquiry cdb: 12 01 83 00 fc 00
> > Designation descriptor number 1, descriptor length: 20
> > id_type: NAA, code_set: Binary
> > associated with the addressed logical unit
> > NAA 6, IEEE Company_id: 0x1405
> > Vendor Specific Identifier: 0xa97e4ce21
> > Vendor Specific Identifier Extension: 0xc0711de829b000c2
> > [0x6001405a97e4ce21c0711de829b000c2]
> > Designation descriptor number 2, descriptor length: 52
> > id_type: T10 vendor identification, code_set: ASCII
> > associated with the addressed logical unit
> > vendor id: LIO-ORG
> > vendor specific: IBLOCK:a97e4ce21c0711de829b000c2943d57b
> > Designation descriptor number 3, descriptor length: 8
> > transport: Internet SCSI (iSCSI)
> > id_type: Relative target port, code_set: Binary
> > associated with the target port
> > Relative target port: 0x2
> > Designation descriptor number 4, descriptor length: 8
> > transport: Internet SCSI (iSCSI)
> > id_type: Target port group, code_set: Binary
> > associated with the target port
> > Target port group: 0x0
> > Designation descriptor number 5, descriptor length: 8
> > id_type: Logical unit group, code_set: Binary
> > associated with the addressed logical unit
> > Logical unit group: 0x0
> > Designation descriptor number 6, descriptor length: 72
> > transport: Internet SCSI (iSCSI)
> > id_type: SCSI name string, code_set: UTF-8
> > associated with the target port
> > SCSI name string:
> > iqn.2003-01.org.linux-iscsi.target.i686:sn.cff3eedbd2fd,t,0x0001
> >
> > Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>
> > ---
> > drivers/lio-core/target_core_transport.c | 117 +++++++++++++++++++++++++-----
> > 1 files changed, 100 insertions(+), 17 deletions(-)
> >
> > diff --git a/drivers/lio-core/target_core_transport.c b/drivers/lio-core/target_core_transport.c
> > index 4132da1..e8879a9 100644
> > --- a/drivers/lio-core/target_core_transport.c
> > +++ b/drivers/lio-core/target_core_transport.c
> > @@ -4142,6 +4142,33 @@ static inline void transport_get_maps(se_cmd_t *cmd)
> > cmd->transport_unmap_SG_segments = &transport_generic_unmap_SG_segments;
> > }
> >
> > +static unsigned char asciihex_to_binaryhex(unsigned char val[2])
> > +{
> > + unsigned char result = 0;
> > + /*
> > + * MSB
> > + */
> > + if ((val[0] >= 'a') && (val[0] <= 'f'))
> > + result = ((val[0] - 'a' + 10) & 0xf) << 4;
> > + else
> > + if ((val[0] >= 'A') && (val[0] <= 'F'))
> > + result = ((val[0] - 'A' + 10) & 0xf) << 4;
> > + else /* digit */
> > + result = ((val[0] - '0') & 0xf) << 4;
> > + /*
> > + * LSB
> > + */
> > + if ((val[1] >= 'a') && (val[1] <= 'f'))
> > + result |= ((val[1] - 'a' + 10) & 0xf);
> > + else
> > + if ((val[1] >= 'A') && (val[1] <= 'F'))
> > + result |= ((val[1] - 'A' + 10) & 0xf);
> > + else /* digit */
> > + result |= ((val[1] - '0') & 0xf);
> > +
> > + return result;
> > +}
> > +
> > extern int transport_generic_emulate_inquiry(
> > se_cmd_t *cmd,
> > unsigned char type,
> > @@ -4157,10 +4184,11 @@ extern int transport_generic_emulate_inquiry(
> > t10_alua_tg_pt_gp_member_t *tg_pt_gp_mem;
> > unsigned char *buf = (unsigned char *) T_TASK(cmd)->t_task_buf;
> > unsigned char *cdb = T_TASK(cmd)->t_task_cdb;
> > - unsigned char *iqn_sn;
> > + unsigned char *iqn_sn, binary, binary_new;
> > u32 prod_len, iqn_sn_len, se_location_len;
> > u32 unit_serial_len, off = 0;
> > - u16 len = 0;
> > + int i;
> > + u16 len = 0, id_len;
> >
> > /*
> > * Make sure we at least have 8 bytes of INQUIRY response payload
> > @@ -4256,10 +4284,61 @@ extern int transport_generic_emulate_inquiry(
> > * DESIGNATOR TYPEs see spc4r17 Table 459.
> > */
> > buf[1] = 0x83;
> > + off = 4;
> > + /*
> > + * NAA IEEE Registered Extended Assigned designator format,
> > + * see spc4r17 section 7.7.3.6.5
> > + *
> > + * We depend upon a target_core_mod/ConfigFS provided
> > + * /sys/kernel/config/target/core/$HBA/$DEV/wwn/evpd_unit_serial
> > + * value in order to return the NAA id.
> > + */
> > + if (!(dev->se_sub_dev->su_dev_flags &
> > + SDF_EMULATED_EVPD_UNIT_SERIAL))
> > + goto check_t10_vend_desc;
> > + if ((off + 20) > cmd->data_length)
> > + goto check_t10_vend_desc;
> > + /* CODE SET == Binary */
> > + buf[off++] = 0x1;
> > + /* Set ASSOICATION == addressed logical unit: 0)b */
> > + buf[off] = 0x00;
> > + /* Identifier/Designator type == NAA identifier */
> > + buf[off++] = 0x3;
> > + off++;
> > + /* Identifier/Designator length */
> > + buf[off++] = 0x10;
> > + /*
> > + * Start NAA IEEE Registered Extended Identifier/Designator
> > + */
> > + buf[off++] = (0x6 << 4);
> > + /*
> > + * Use OpenFabrics IEEE Company ID: 00 14 05
> > + */
> > + buf[off++] = 0x01;
> > + buf[off++] = 0x40;
> > + buf[off] = (0x5 << 4);
> > + /*
> > + * Return ConfigFS Unit Serial Number information for
> > + * VENDOR_SPECIFIC_IDENTIFIER and
> > + * VENDOR_SPECIFIC_IDENTIFIER_EXTENTION
> > + */
> > + binary = asciihex_to_binaryhex(
> > + &DEV_T10_WWN(dev)->unit_serial[0]);
> > + buf[off++] |= (binary & 0xf0) >> 4;
> > + for (i = 0; i < 24; i += 2) {
> > + binary_new = asciihex_to_binaryhex(
> > + &DEV_T10_WWN(dev)->unit_serial[i+2]);
> > + buf[off] = (binary & 0x0f) << 4;
> > + buf[off++] |= (binary_new & 0xf0) >> 4;
> > + binary = binary_new;
> > + }
> > + len = 20;
> > + off = (len + 4);
> > +check_t10_vend_desc:
> > /*
> > * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
> > */
> > - len += 8; /* For Vendor field */
> > + id_len = 8; /* For Vendor field */
> > prod_len = 4; /* For EVPD Header */
> > prod_len += 8; /* For Vendor field */
> > prod_len += strlen(prod);
> > @@ -4271,12 +4350,14 @@ extern int transport_generic_emulate_inquiry(
> > strlen(&DEV_T10_WWN(dev)->unit_serial[0]);
> > unit_serial_len++; /* For NULL Terminator */
> >
> > - if (((len + 4) + (prod_len + unit_serial_len)) >
> > + if ((len + (id_len + 4) +
> > + (prod_len + unit_serial_len)) >
> > cmd->data_length) {
> > len += (prod_len + unit_serial_len);
> > goto check_port;
> > }
> > - len += sprintf((unsigned char *)&buf[16], "%s:%s", prod,
> > + id_len += sprintf((unsigned char *)&buf[off+12],
> > + "%s:%s", prod,
> > &DEV_T10_WWN(dev)->unit_serial[0]);
> > } else {
> > iqn_sn = transport_get_iqn_sn();
> > @@ -4285,24 +4366,26 @@ extern int transport_generic_emulate_inquiry(
> > se_location_len = strlen(se_location);
> > se_location_len++; /* For NULL Terminator */
> >
> > - if (((len + 4) + (prod_len + iqn_sn_len +
> > + if ((len + (id_len + 4) + (prod_len + iqn_sn_len +
> > se_location_len)) > cmd->data_length) {
> > len += (prod_len + iqn_sn_len +
> > se_location_len);
> > goto check_port;
> > }
> > - len += sprintf((unsigned char *)&buf[16], "%s:%s:%s",
> > - prod, iqn_sn, se_location);
> > + id_len += sprintf((unsigned char *)&buf[off+12],
> > + "%s:%s:%s", prod, iqn_sn, se_location);
> > }
> > - buf[4] = 0x2; /* ASCII */
> > - buf[5] = 0x1; /* T10 Vendor ID */
> > - buf[6] = 0x0;
> > - memcpy((unsigned char *)&buf[8], "LIO-ORG", 8);
> > -
> > - len++; /* Extra Byte for NULL Terminator */
> > - buf[7] = len; /* Identifier Length */
> > - len += 4; /* Header size for Designation descriptor */
> > - off = (len + 4);
> > + buf[off] = 0x2; /* ASCII */
> > + buf[off+1] = 0x1; /* T10 Vendor ID */
> > + buf[off+2] = 0x0;
> > + memcpy((unsigned char *)&buf[off+4], "LIO-ORG", 8);
> > + /* Extra Byte for NULL Terminator */
> > + id_len++;
> > + /* Identifier Length */
> > + buf[off+3] = id_len;
> > + /* Header size for Designation descriptor */
> > + len += (id_len + 4);
> > + off += (id_len + 4);
> > /*
> > * se_port_t is only set for INQUIRY EVPD=1 through $FABRIC_MOD
> > */
>
>
--
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