[SCSI] libfcoe, fcoe: libfcoe NPIV support

The FIP code in libfcoe needed several changes to support NPIV

1) dst_src_addr needs to be managed per-n_port-ID for FPMA fabrics with NPIV
   enabled.  Managing the MAC address is now handled in fcoe, with some slight
   changes to update_mac() and a new get_src_addr() function pointer.

2) The libfc elsct_send() hook is used to setup FCoE specific response
   handlers for FIP encapsulated ELS exchanges.  This lets the FCoE specific
   handling know which VN_Port the exchange is for, and doesn't require
   tracking OX_IDs.  It might be possible to roll back to the full FIP frame
   in these, but for now I've just stashed the contents of the MAC address
   descriptor in the skb context block for later use.  Also, because
   fcoe_elsct_send() just passes control on to fc_elsct_send(), all transmits
   still come through the normal frame_send() path.

3) The NPIV changes added a mutex hold in the keep alive sending, the lport
   mutex is protecting the vport list.  We can't take a mutex from a timer,
   so move the FIP keep alive logic to the link work struct.

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, 6 insertions, 3 deletions

diff --git a/drivers/scsi/libfc/fc_elsct.c b/drivers/scsi/libfc/fc_elsct.c
index 92984587ff4d..aae54fe3b299 100644
--- a/drivers/scsi/libfc/fc_elsct.c
+++ b/drivers/scsi/libfc/fc_elsct.c
@@ -31,7 +31,7 @@
 /*
  * fc_elsct_send - sends ELS/CT frame
  */
-static struct fc_seq *fc_elsct_send(struct fc_lport *lport,
+struct fc_seq *fc_elsct_send(struct fc_lport *lport,
                                     u32 did,
                                     struct fc_frame *fp,
                                     unsigned int op,
@@ -63,6 +63,7 @@ static struct fc_seq *fc_elsct_send(struct fc_lport *lport,
 
         return lport->tt.exch_seq_send(lport, fp, resp, NULL, arg, timer_msec);
 }
+EXPORT_SYMBOL(fc_elsct_send);
 
 int fc_elsct_init(struct fc_lport *lport)
 {
diff --git a/drivers/scsi/libfc/fc_lport.c b/drivers/scsi/libfc/fc_lport.c
index ccba67ca68a1..807f5b3e4efe 100644
--- a/drivers/scsi/libfc/fc_lport.c
+++ b/drivers/scsi/libfc/fc_lport.c
@@ -1320,7 +1320,7 @@ static void fc_lport_timeout(struct work_struct *work)
  * held, but it will lock, call an _enter_* function or fc_lport_error
  * and then unlock the lport.
  */
-static void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
+void fc_lport_logo_resp(struct fc_seq *sp, struct fc_frame *fp,
                                void *lp_arg)
 {
         struct fc_lport *lport = lp_arg;
@@ -1357,6 +1357,7 @@ out:
 err:
         mutex_unlock(&lport->lp_mutex);
 }
+EXPORT_SYMBOL(fc_lport_logo_resp);
 
 /**
  * fc_rport_enter_logo() - Logout of the fabric
@@ -1397,7 +1398,7 @@ static void fc_lport_enter_logo(struct fc_lport *lport)
  * held, but it will lock, call an _enter_* function or fc_lport_error
  * and then unlock the lport.
  */
-static void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
+void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
                                 void *lp_arg)
 {
         struct fc_lport *lport = lp_arg;
@@ -1480,6 +1481,7 @@ out:
 err:
         mutex_unlock(&lport->lp_mutex);
 }
+EXPORT_SYMBOL(fc_lport_flogi_resp);
 
 /**
  * fc_rport_enter_flogi() - Send a FLOGI request to the fabric manager