iscsi: Resolve iscsi_proto.h naming conflicts with drivers/target/iscsi

This patch renames the following iscsi_proto.h structures to avoid
namespace issues with drivers/target/iscsi/iscsi_target_core.h:

*) struct iscsi_cmd -> struct iscsi_scsi_req
*) struct iscsi_cmd_rsp -> struct iscsi_scsi_rsp
*) struct iscsi_login -> struct iscsi_login_req

This patch includes useful ISCSI_FLAG_LOGIN_[CURRENT,NEXT]_STAGE*,
and ISCSI_FLAG_SNACK_TYPE_* definitions used by iscsi_target_mod, and
fixes the incorrect definition of struct iscsi_snack to following
RFC-3720 Section 10.16. SNACK Request.

Also, this patch updates libiscsi, iSER, be2iscsi, and bn2xi to
use the updated structure definitions in a handful of locations.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>

1 files changed, 22 insertions, 8 deletions

diff --git a/include/scsi/iscsi_proto.h b/include/scsi/iscsi_proto.h
index dd0a52cea95a..a9c9058ffc60 100644
--- a/include/scsi/iscsi_proto.h
+++ b/include/scsi/iscsi_proto.h
@@ -116,7 +116,7 @@ struct iscsi_ahs_hdr {
 #define ISCSI_CDB_SIZE                  16
 
 /* iSCSI PDU Header */
-struct iscsi_cmd {
+struct iscsi_scsi_req {
         uint8_t opcode;
         uint8_t flags;
         __be16 rsvd2;
@@ -161,7 +161,7 @@ struct iscsi_ecdb_ahdr {
 };
 
 /* SCSI Response Header */
-struct iscsi_cmd_rsp {
+struct iscsi_scsi_rsp {
         uint8_t opcode;
         uint8_t flags;
         uint8_t response;
@@ -406,7 +406,7 @@ struct iscsi_text_rsp {
 };
 
 /* Login Header */
-struct iscsi_login {
+struct iscsi_login_req {
         uint8_t opcode;
         uint8_t flags;
         uint8_t max_version;    /* Max. version supported */
@@ -427,7 +427,13 @@ struct iscsi_login {
 #define ISCSI_FLAG_LOGIN_TRANSIT                0x80
 #define ISCSI_FLAG_LOGIN_CONTINUE               0x40
 #define ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK     0x0C    /* 2 bits */
+#define ISCSI_FLAG_LOGIN_CURRENT_STAGE1         0x04
+#define ISCSI_FLAG_LOGIN_CURRENT_STAGE2         0x08
+#define ISCSI_FLAG_LOGIN_CURRENT_STAGE3         0x0C
 #define ISCSI_FLAG_LOGIN_NEXT_STAGE_MASK        0x03    /* 2 bits */
+#define ISCSI_FLAG_LOGIN_NEXT_STAGE1            0x01
+#define ISCSI_FLAG_LOGIN_NEXT_STAGE2            0x02
+#define ISCSI_FLAG_LOGIN_NEXT_STAGE3            0x03
 
 #define ISCSI_LOGIN_CURRENT_STAGE(flags) \
         ((flags & ISCSI_FLAG_LOGIN_CURRENT_STAGE_MASK) >> 2)
@@ -550,17 +556,25 @@ struct iscsi_logout_rsp {
 struct iscsi_snack {
         uint8_t opcode;
         uint8_t flags;
-        uint8_t rsvd2[14];
+        uint8_t rsvd2[2];
+        uint8_t hlength;
+        uint8_t dlength[3];
+        uint8_t lun[8];
         itt_t    itt;
+        __be32  ttt;
+        uint8_t rsvd3[4];
+        __be32  exp_statsn;
+        uint8_t rsvd4[8];
         __be32  begrun;
         __be32  runlength;
-        __be32  exp_statsn;
-        __be32  rsvd3;
-        __be32  exp_datasn;
-        uint8_t rsvd6[8];
 };
 
 /* SNACK PDU flags */
+#define ISCSI_FLAG_SNACK_TYPE_DATA              0
+#define ISCSI_FLAG_SNACK_TYPE_R2T               0
+#define ISCSI_FLAG_SNACK_TYPE_STATUS            1
+#define ISCSI_FLAG_SNACK_TYPE_DATA_ACK          2
+#define ISCSI_FLAG_SNACK_TYPE_RDATA             3
 #define ISCSI_FLAG_SNACK_TYPE_MASK      0x0F    /* 4 bits */
 
 /* Reject Message Header */