target: Add DIF related base definitions

This patch adds DIF related definitions to target_core_base.h
that includes enums for target_prot_op + target_prot_type +
target_prot_version + target_guard_type + target_pi_error.

Also included is struct se_dif_v1_tuple, along with changes
to struct se_cmd, struct se_dev_attrib, and struct se_device.

Also, add new se_subsystem_api->[init,format,free]_prot() callers
used by target core code to setup backend specific protection
information after the device has been configured.

Enums taken from Sagi Grimberg's original patch.

v2 changes:
  - Drop guard_type related definitions
  - Update target_prot_op + target_prot_ho definitions (Sagi)
  - Drop SCF_PROT + pi_prot_version flag
  - Add se_subsystem_api->format_prot() (Sagi)
  - Add hw_pi_prot_type device attribute

Cc: Martin K. Petersen <martin.petersen@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Hannes Reinecke <hare@suse.de>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/include/target/target_core_backend.h b/include/target/target_core_backend.h
index 39e0114..0dc2745 100644 (file)
--- a/include/target/target_core_backend.h
+++ b/include/target/target_core_backend.h
@@ -41,6 +41,9 @@ struct se_subsystem_api {
        unsigned int (*get_io_opt)(struct se_device *);
        unsigned char *(*get_sense_buffer)(struct se_cmd *);
        bool (*get_write_cache)(struct se_device *);
+       int (*init_prot)(struct se_device *);
+       int (*format_prot)(struct se_device *);
+       void (*free_prot)(struct se_device *);
 };
 
 struct sbc_ops {

diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index dd87ab4..d98048b 100644 (file)
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -435,6 +435,34 @@ struct se_tmr_req {
        struct list_head        tmr_list;
 };
 
+enum target_prot_op {
+       TARGET_PROT_NORMAL = 0,
+       TARGET_PROT_DIN_INSERT,
+       TARGET_PROT_DOUT_INSERT,
+       TARGET_PROT_DIN_STRIP,
+       TARGET_PROT_DOUT_STRIP,
+       TARGET_PROT_DIN_PASS,
+       TARGET_PROT_DOUT_PASS,
+};
+
+enum target_prot_ho {
+       PROT_SEPERATED,
+       PROT_INTERLEAVED,
+};
+
+enum target_prot_type {
+       TARGET_DIF_TYPE0_PROT,
+       TARGET_DIF_TYPE1_PROT,
+       TARGET_DIF_TYPE2_PROT,
+       TARGET_DIF_TYPE3_PROT,
+};
+
+struct se_dif_v1_tuple {
+       __be16                  guard_tag;
+       __be16                  app_tag;
+       __be32                  ref_tag;
+};
+
 struct se_cmd {
        /* SAM response code being sent to initiator */
        u8                      scsi_status;
@@ -519,6 +547,17 @@ struct se_cmd {
 
        /* Used for lun->lun_ref counting */
        bool                    lun_ref_active;
+
+       /* DIF related members */
+       enum target_prot_op     prot_op;
+       enum target_prot_type   prot_type;
+       u32                     prot_length;
+       u32                     reftag_seed;
+       struct scatterlist      *t_prot_sg;
+       unsigned int            t_prot_nents;
+       enum target_prot_ho     prot_handover;
+       sense_reason_t          pi_err;
+       u32                     block_num;
 };
 
 struct se_ua {
@@ -629,6 +668,9 @@ struct se_dev_attrib {
        int             emulate_tpws;
        int             emulate_caw;
        int             emulate_3pc;
+       int             pi_prot_format;
+       enum target_prot_type pi_prot_type;
+       enum target_prot_type hw_pi_prot_type;
        int             enforce_pr_isids;
        int             is_nonrot;
        int             emulate_rest_reord;
@@ -759,6 +801,8 @@ struct se_device {
        /* Linked list for struct se_hba struct se_device list */
        struct list_head        dev_list;
        struct se_lun           xcopy_lun;
+       /* Protection Information */
+       int                     prot_length;
 };
 
 struct se_hba {