From: Jon Derrick <jonathan.derrick@intel.com> To: axboe@fb.com Cc: linux-nvme@lists.infradead.org, linux-scsi@vger.kernel.org, keith.busch@intel.com, hch@infradead.org, sagi@grimberg.me, Jon Derrick <jonathan.derrick@intel.com> Subject: [PATCH] nvme-scsi: Use correct byte ordering for eui64 in Dev ID VPD Date: Tue, 25 Apr 2017 14:18:09 -0600 [thread overview] Message-ID: <20170425201809.1683-1-jonathan.derrick@intel.com> (raw) NVME specifies an EUI64/NGUID in little-endian format, while SCSI specifies that the Device Identification VPD use big-endian for EUI formats. The current code copies this bytestream directly from the Identification Namespace page, meaning we just need to reverse the bytestream when passing it on to the VPD. This results in the correct values being parsed by sg-tools, eg: $ sg_inq -e -p 0x83 /dev/nvme1n1 -vvv open /dev/nvme1n1 with flags=0x800 VPD INQUIRY: Device Identification page inquiry cdb: 12 01 83 00 fc 00 duration=0 ms Designation descriptor number 1, descriptor length: 20 designator_type: EUI-64 based, code_set: Binary associated with the addressed logical unit EUI-64 based 16 byte identifier Identifier extension: 0x100000001 IEEE Company_id: 0x5cd2e4 Vendor Specific Extension Identifier: 0x0 [0x00000001000000015cd2e40000000000] Signed-off-by: Jon Derrick <jonathan.derrick@intel.com> --- drivers/nvme/host/scsi.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/nvme/host/scsi.c b/drivers/nvme/host/scsi.c index f49ae27..8f94e77 100644 --- a/drivers/nvme/host/scsi.c +++ b/drivers/nvme/host/scsi.c @@ -598,6 +598,7 @@ static int nvme_fill_device_id_eui64(struct nvme_ns *ns, struct sg_io_hdr *hdr, int nvme_sc, res; size_t len; void *eui; + int i; nvme_sc = nvme_identify_ns(ns->ctrl, ns->ns_id, &id_ns); res = nvme_trans_status_code(hdr, nvme_sc); @@ -628,7 +629,8 @@ static int nvme_fill_device_id_eui64(struct nvme_ns *ns, struct sg_io_hdr *hdr, inq_response[5] = 0x02; /* PIV=0b | Asso=00b | Designator Type=2h */ inq_response[6] = 0x00; /* Rsvd */ inq_response[7] = len; /* Designator Length */ - memcpy(&inq_response[8], eui, len); + for (i = 0; i < len; i++) + inq_response[8 + i] = ((char *)eui)[len - (i + 1)]; res = nvme_trans_copy_to_user(hdr, inq_response, alloc_len); out_free_id: -- 2.9.3
WARNING: multiple messages have this Message-ID (diff)
From: jonathan.derrick@intel.com (Jon Derrick) Subject: [PATCH] nvme-scsi: Use correct byte ordering for eui64 in Dev ID VPD Date: Tue, 25 Apr 2017 14:18:09 -0600 [thread overview] Message-ID: <20170425201809.1683-1-jonathan.derrick@intel.com> (raw) NVME specifies an EUI64/NGUID in little-endian format, while SCSI specifies that the Device Identification VPD use big-endian for EUI formats. The current code copies this bytestream directly from the Identification Namespace page, meaning we just need to reverse the bytestream when passing it on to the VPD. This results in the correct values being parsed by sg-tools, eg: $ sg_inq -e -p 0x83 /dev/nvme1n1 -vvv open /dev/nvme1n1 with flags=0x800 VPD INQUIRY: Device Identification page inquiry cdb: 12 01 83 00 fc 00 duration=0 ms Designation descriptor number 1, descriptor length: 20 designator_type: EUI-64 based, code_set: Binary associated with the addressed logical unit EUI-64 based 16 byte identifier Identifier extension: 0x100000001 IEEE Company_id: 0x5cd2e4 Vendor Specific Extension Identifier: 0x0 [0x00000001000000015cd2e40000000000] Signed-off-by: Jon Derrick <jonathan.derrick at intel.com> --- drivers/nvme/host/scsi.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/nvme/host/scsi.c b/drivers/nvme/host/scsi.c index f49ae27..8f94e77 100644 --- a/drivers/nvme/host/scsi.c +++ b/drivers/nvme/host/scsi.c @@ -598,6 +598,7 @@ static int nvme_fill_device_id_eui64(struct nvme_ns *ns, struct sg_io_hdr *hdr, int nvme_sc, res; size_t len; void *eui; + int i; nvme_sc = nvme_identify_ns(ns->ctrl, ns->ns_id, &id_ns); res = nvme_trans_status_code(hdr, nvme_sc); @@ -628,7 +629,8 @@ static int nvme_fill_device_id_eui64(struct nvme_ns *ns, struct sg_io_hdr *hdr, inq_response[5] = 0x02; /* PIV=0b | Asso=00b | Designator Type=2h */ inq_response[6] = 0x00; /* Rsvd */ inq_response[7] = len; /* Designator Length */ - memcpy(&inq_response[8], eui, len); + for (i = 0; i < len; i++) + inq_response[8 + i] = ((char *)eui)[len - (i + 1)]; res = nvme_trans_copy_to_user(hdr, inq_response, alloc_len); out_free_id: -- 2.9.3
next reply other threads:[~2017-04-25 20:21 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-04-25 20:18 Jon Derrick [this message] 2017-04-25 20:18 ` [PATCH] nvme-scsi: Use correct byte ordering for eui64 in Dev ID VPD Jon Derrick 2017-04-25 20:55 ` Jon Derrick 2017-04-25 20:55 ` Jon Derrick 2017-04-26 7:22 ` Christoph Hellwig 2017-04-26 7:22 ` Christoph Hellwig
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