target/qla2xxx: Honor max_data_sg_nents I/O transfer limit

[firefly-linux-kernel-4.4.55.git] / include / target / target_core_fabric.h

diff --git a/include/target/target_core_fabric.h b/include/target/target_core_fabric.h
index 69355feabd1d5684f0bf71edbbf82c6be3095711..7fb2557a760e432ffa054f2550acd8e8a9e7085a 100644 (file)
--- a/include/target/target_core_fabric.h
+++ b/include/target/target_core_fabric.h
@@ -5,6 +5,19 @@ struct target_core_fabric_ops {
        struct module *module;
        const char *name;
        size_t node_acl_size;
+       /*
+        * Limits number of scatterlist entries per SCF_SCSI_DATA_CDB payload.
+        * Setting this value tells target-core to enforce this limit, and
+        * report as INQUIRY EVPD=b0 MAXIMUM TRANSFER LENGTH.
+        *
+        * target-core will currently reset se_cmd->data_length to this
+        * maximum size, and set UNDERFLOW residual count if length exceeds
+        * this limit.
+        *
+        * XXX: Not all initiator hosts honor this block-limit EVPD
+        * XXX: Currently assumes single PAGE_SIZE per scatterlist entry
+        */
+       u32 max_data_sg_nents;
        char *(*get_fabric_name)(void);
        char *(*tpg_get_wwn)(struct se_portal_group *);
        u16 (*tpg_get_tag)(struct se_portal_group *);