[SCSI] libfc: add some generic NPIV support routines to libfc

Adds a function to create a new VN_Port instances, which share the EM
list with the N_Port, VN_Port lookup by fabric ID when responding to a new
request (otherwise the exchange lookup from the N_Ports EM list is trusted to
return an exchange with a cached lport value for the correct VN_Port),
a pointer to a fc_vport structure for VN_Ports, and flags to indicate if an
N_Port supports NPIV and if the switch/fabric allows it.

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>

1 files changed, 20 insertions, 0 deletions

diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
index ed3057b4e78d..2c6d55de8ccd 100644
--- a/include/scsi/libfc.h
+++ b/include/scsi/libfc.h
@@ -640,6 +640,8 @@ struct fc_lport {
         /* Associations */
         struct Scsi_Host        *host;
         struct list_head        ema_list;
+        struct list_head        vports;         /* child vports if N_Port */
+        struct fc_vport         *vport;         /* parent vport if VN_Port */
         struct fc_rport_priv    *dns_rp;
         struct fc_rport_priv    *ptp_rp;
         void                    *scsi_priv;
@@ -664,6 +666,8 @@ struct fc_lport {
         u32                     seq_offload:1;  /* seq offload supported */
         u32                     crc_offload:1;  /* crc offload supported */
         u32                     lro_enabled:1;  /* large receive offload */
+        u32                     does_npiv:1;    /* supports multiple vports */
+        u32                     npiv_enabled:1; /* switch/fabric allows NPIV */
         u32                     mfs;            /* max FC payload size */
         unsigned int            service_params;
         unsigned int            e_d_tov;
@@ -753,6 +757,7 @@ libfc_host_alloc(struct scsi_host_template *sht, int priv_size)
         lport = shost_priv(shost);
         lport->host = shost;
         INIT_LIST_HEAD(&lport->ema_list);
+        INIT_LIST_HEAD(&lport->vports);
         return lport;
 }
 
@@ -805,6 +810,15 @@ int fc_lport_reset(struct fc_lport *);
  */
 int fc_set_mfs(struct fc_lport *lp, u32 mfs);
 
+/*
+ * Allocate a new lport struct for an NPIV VN_Port
+ */
+struct fc_lport *libfc_vport_create(struct fc_vport *vport, int privsize);
+
+/*
+ * Find an NPIV VN_Port by port ID
+ */
+struct fc_lport *fc_vport_id_lookup(struct fc_lport *n_port, u32 port_id);
 
 /*
  * REMOTE PORT LAYER
@@ -912,6 +926,12 @@ struct fc_exch_mgr_anchor *fc_exch_mgr_add(struct fc_lport *lport,
 void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema);
 
 /*
+ * Clone an exchange manager list, getting reference holds for each EM.
+ * This is for use with NPIV and sharing the X_ID space between VN_Ports.
+ */
+int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst);
+
+/*
  * Allocates an Exchange Manager (EM).
  *
  * The EM manages exchanges for their allocation and