[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, 29 insertions, 0 deletions

diff --git a/drivers/scsi/libfc/fc_exch.c b/drivers/scsi/libfc/fc_exch.c
index ee6031e24c14..751a485685d9 100644
--- a/drivers/scsi/libfc/fc_exch.c
+++ b/drivers/scsi/libfc/fc_exch.c
@@ -1134,6 +1134,15 @@ static void fc_exch_recv_req(struct fc_lport *lp, struct fc_exch_mgr *mp,
         u32 f_ctl;
         enum fc_pf_rjt_reason reject;
 
+        /* We can have the wrong fc_lport at this point with NPIV, which is a
+         * problem now that we know a new exchange needs to be allocated
+         */
+        lp = fc_vport_id_lookup(lp, ntoh24(fh->fh_d_id));
+        if (!lp) {
+                fc_frame_free(fp);
+                return;
+        }
+
         fr_seq(fp) = NULL;
         reject = fc_seq_lookup_recip(lp, mp, fp);
         if (reject == FC_RJT_NONE) {
@@ -1900,6 +1909,26 @@ void fc_exch_mgr_del(struct fc_exch_mgr_anchor *ema)
 }
 EXPORT_SYMBOL(fc_exch_mgr_del);
 
+/**
+ * fc_exch_mgr_list_clone() - share all exchange manager objects
+ * @src: source lport to clone exchange managers from
+ * @dst: new lport that takes references to all the exchange managers
+ */
+int fc_exch_mgr_list_clone(struct fc_lport *src, struct fc_lport *dst)
+{
+        struct fc_exch_mgr_anchor *ema, *tmp;
+
+        list_for_each_entry(ema, &src->ema_list, ema_list) {
+                if (!fc_exch_mgr_add(dst, ema->mp, ema->match))
+                        goto err;
+        }
+        return 0;
+err:
+        list_for_each_entry_safe(ema, tmp, &dst->ema_list, ema_list)
+                fc_exch_mgr_del(ema);
+        return -ENOMEM;
+}
+
 struct fc_exch_mgr *fc_exch_mgr_alloc(struct fc_lport *lp,
                                       enum fc_class class,
                                       u16 min_xid, u16 max_xid,