[SCSI] libfc, libfcoe: FDISC ELS for NPIV

Add FDISC ELS handling to libfc and libfcoe, treat it the same as FLOGI where
appropriate.

Add checking for NPIV support in the FLOGI LS_ACC service parameters.

Signed-off-by: Chris Leech <christopher.leech@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

2 files changed, 32 insertions, 1 deletions

diff --git a/include/scsi/fc/fc_els.h b/include/scsi/fc/fc_els.h
index 195ca014d3ce..b0872afe2d30 100644
--- a/include/scsi/fc/fc_els.h
+++ b/include/scsi/fc/fc_els.h
@@ -248,10 +248,12 @@ struct fc_els_csp {
 /*
  * sp_features
  */
-#define FC_SP_FT_CIRO   0x8000  /* continuously increasing rel. off. */
+#define FC_SP_FT_NPIV   0x8000  /* multiple N_Port_ID support (FLOGI) */
+#define FC_SP_FT_CIRO   0x8000  /* continuously increasing rel off (PLOGI) */
 #define FC_SP_FT_CLAD   0x8000  /* clean address (in FLOGI LS_ACC) */
 #define FC_SP_FT_RAND   0x4000  /* random relative offset */
 #define FC_SP_FT_VAL    0x2000  /* valid vendor version level */
+#define FC_SP_FT_NPIV_ACC       0x2000  /* NPIV assignment (FLOGI LS_ACC) */
 #define FC_SP_FT_FPORT  0x1000  /* F port (1) vs. N port (0) */
 #define FC_SP_FT_ABB    0x0800  /* alternate BB_credit management */
 #define FC_SP_FT_EDTR   0x0400  /* E_D_TOV Resolution is nanoseconds */
diff --git a/include/scsi/fc_encode.h b/include/scsi/fc_encode.h
index 27dad703824f..c93ca3ece1a0 100644
--- a/include/scsi/fc_encode.h
+++ b/include/scsi/fc_encode.h
@@ -198,6 +198,31 @@ static inline void fc_flogi_fill(struct fc_lport *lport, struct fc_frame *fp)
         sp->sp_bb_data = htons((u16) lport->mfs);
         cp = &flogi->fl_cssp[3 - 1];    /* class 3 parameters */
         cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
+        if (lport->does_npiv)
+                sp->sp_features = htons(FC_SP_FT_NPIV);
+}
+
+/**
+ * fc_fdisc_fill - Fill in a fdisc request frame.
+ */
+static inline void fc_fdisc_fill(struct fc_lport *lport, struct fc_frame *fp)
+{
+        struct fc_els_csp *sp;
+        struct fc_els_cssp *cp;
+        struct fc_els_flogi *fdisc;
+
+        fdisc = fc_frame_payload_get(fp, sizeof(*fdisc));
+        memset(fdisc, 0, sizeof(*fdisc));
+        fdisc->fl_cmd = (u8) ELS_FDISC;
+        put_unaligned_be64(lport->wwpn, &fdisc->fl_wwpn);
+        put_unaligned_be64(lport->wwnn, &fdisc->fl_wwnn);
+        sp = &fdisc->fl_csp;
+        sp->sp_hi_ver = 0x20;
+        sp->sp_lo_ver = 0x20;
+        sp->sp_bb_cred = htons(10);     /* this gets set by gateway */
+        sp->sp_bb_data = htons((u16) lport->mfs);
+        cp = &fdisc->fl_cssp[3 - 1];    /* class 3 parameters */
+        cp->cp_class = htons(FC_CPC_VALID | FC_CPC_SEQ);
 }
 
 /**
@@ -296,6 +321,10 @@ static inline int fc_els_fill(struct fc_lport *lport,
                 fc_flogi_fill(lport, fp);
                 break;
 
+        case ELS_FDISC:
+                fc_fdisc_fill(lport, fp);
+                break;
+
         case ELS_LOGO:
                 fc_logo_fill(lport, fp);
                 break;