[SCSI] bfa: Add support for max target ports discovery

- Changes to avoid discovering NPIV port as remote port by the other
  NPIV ports created on same physical port when all the NPIV ports are
  part of the same zone in a fabric.
- Provided mechanism to support maximum number of target ports for a
  given initiator port (physical port + NPIV ports) irrespective of the
  way in which the initiator and target ports are zoned in the fabric.
- Introduced module_parameter max_rport_logins to restrict number of
  remote ports discovery which includes target and initiator remote ports.

Signed-off-by: Vijaya Mohan Guvva <vmohan@brocade.com>
Signed-off-by: Krishna Gudipati <kgudipat@brocade.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 45 insertions, 1 deletions

diff --git a/drivers/scsi/bfa/bfa_fcs_lport.c b/drivers/scsi/bfa/bfa_fcs_lport.c
index d4a4d534843..3b75f6fb2de 100644
--- a/drivers/scsi/bfa/bfa_fcs_lport.c
+++ b/drivers/scsi/bfa/bfa_fcs_lport.c
@@ -4691,6 +4691,10 @@ bfa_fcs_lport_ns_process_gidft_pids(struct bfa_fcs_lport_s *port, u32 *pid_buf,
         struct fcgs_gidft_resp_s *gidft_entry;
         struct bfa_fcs_rport_s *rport;
         u32        ii;
+        struct bfa_fcs_fabric_s *fabric = port->fabric;
+        struct bfa_fcs_vport_s *vport;
+        struct list_head *qe;
+        u8 found = 0;
 
         for (ii = 0; ii < n_pids; ii++) {
                 gidft_entry = (struct fcgs_gidft_resp_s *) &pid_buf[ii];
@@ -4699,6 +4703,29 @@ bfa_fcs_lport_ns_process_gidft_pids(struct bfa_fcs_lport_s *port, u32 *pid_buf,
                         continue;
 
                 /*
+                 * Ignore PID if it is of base port
+                 * (Avoid vports discovering base port as remote port)
+                 */
+                if (gidft_entry->pid == fabric->bport.pid)
+                        continue;
+
+                /*
+                 * Ignore PID if it is of vport created on the same base port
+                 * (Avoid vport discovering every other vport created on the
+                 * same port as remote port)
+                 */
+                list_for_each(qe, &fabric->vport_q) {
+                        vport = (struct bfa_fcs_vport_s *) qe;
+                        if (vport->lport.pid == gidft_entry->pid)
+                                found = 1;
+                }
+
+                if (found) {
+                        found = 0;
+                        continue;
+                }
+
+                /*
                  * Check if this rport already exists
                  */
                 rport = bfa_fcs_lport_get_rport_by_pid(port, gidft_entry->pid);
@@ -4765,7 +4792,8 @@ bfa_fcs_lport_ns_query(struct bfa_fcs_lport_s *port)
         struct bfa_fcs_lport_ns_s *ns = BFA_FCS_GET_NS_FROM_PORT(port);
 
         bfa_trc(port->fcs, port->pid);
-        bfa_sm_send_event(ns, NSSM_EVENT_NS_QUERY);
+        if (bfa_sm_cmp_state(ns, bfa_fcs_lport_ns_sm_online))
+                bfa_sm_send_event(ns, NSSM_EVENT_NS_QUERY);
 }
 
 static void
@@ -5183,10 +5211,26 @@ static void
 bfa_fcs_lport_scn_portid_rscn(struct bfa_fcs_lport_s *port, u32 rpid)
 {
         struct bfa_fcs_rport_s *rport;
+        struct bfa_fcs_fabric_s *fabric = port->fabric;
+        struct bfa_fcs_vport_s *vport;
+        struct list_head *qe;
 
         bfa_trc(port->fcs, rpid);
 
         /*
+         * Ignore PID if it is of base port or of vports created on the
+         * same base port. It is to avoid vports discovering base port or
+         * other vports created on same base port as remote port
+         */
+        if (rpid == fabric->bport.pid)
+                return;
+
+        list_for_each(qe, &fabric->vport_q) {
+                vport = (struct bfa_fcs_vport_s *) qe;
+                if (vport->lport.pid == rpid)
+                        return;
+        }
+        /*
          * If this is an unknown device, then it just came online.
          * Otherwise let rport handle the RSCN event.
          */