drivers/target/target_core_spc.c

Source file repositories/reference/linux-study-clean/drivers/target/target_core_spc.c

File Facts

System
Linux kernel
Corpus path
drivers/target/target_core_spc.c
Extension
.c
Size
71466 bytes
Lines
2565
Domain
Driver Families
Bucket
drivers/target
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

if (next) {
			next = false;
			buf[off++] |= val;
		} else {
			next = true;
			buf[off] = val << 4;
		}
	}
}

/*
 * Device identification VPD, for a complete list of
 * DESIGNATOR TYPEs see spc4r17 Table 459.
 */
sense_reason_t
spc_emulate_evpd_83(struct se_cmd *cmd, unsigned char *buf)
{
	struct se_device *dev = cmd->se_dev;
	struct se_lun *lun = cmd->se_lun;
	struct se_portal_group *tpg = NULL;
	struct t10_alua_lu_gp_member *lu_gp_mem;
	struct t10_alua_tg_pt_gp *tg_pt_gp;
	unsigned char *prod = &dev->t10_wwn.model[0];
	u32 off = 0;
	u16 len = 0, id_len;

	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/vpd_unit_serial
	 * value in order to return the NAA id.
	 */
	if (!(dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL))
		goto check_t10_vend_desc;

	/* CODE SET == Binary */
	buf[off++] = 0x1;

	/* Set ASSOCIATION == addressed logical unit: 0)b */
	buf[off] = 0x00;

	/* Identifier/Designator type == NAA identifier */
	buf[off++] |= 0x3;
	off++;

	/* Identifier/Designator length */
	buf[off++] = 0x10;

	/* NAA IEEE Registered Extended designator */
	spc_gen_naa_6h_vendor_specific(dev, &buf[off]);

	len = 20;
	off = (len + 4);

check_t10_vend_desc:
	/*
	 * T10 Vendor Identifier Page, see spc4r17 section 7.7.3.4
	 */
	id_len = 8; /* For Vendor field */

	if (dev->dev_flags & DF_EMULATED_VPD_UNIT_SERIAL)
		id_len += sprintf(&buf[off+12], "%s:%s", prod,
				&dev->t10_wwn.unit_serial[0]);
	buf[off] = 0x2; /* ASCII */
	buf[off+1] = 0x1; /* T10 Vendor ID */
	buf[off+2] = 0x0;
	/* left align Vendor ID and pad with spaces */
	memset(&buf[off+4], 0x20, INQUIRY_VENDOR_LEN);
	memcpy(&buf[off+4], dev->t10_wwn.vendor,
	       strnlen(dev->t10_wwn.vendor, INQUIRY_VENDOR_LEN));
	/* 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);

	if (1) {
		struct t10_alua_lu_gp *lu_gp;
		u32 padding, scsi_name_len, scsi_target_len;
		u16 lu_gp_id = 0;
		u16 tg_pt_gp_id = 0;
		u16 tpgt;

		tpg = lun->lun_tpg;

Annotation

Implementation Notes