[SCSI] zfcp: Adapt to new FC_PORTSPEED semantics

Commit a9277e7783651d4e0a849f7988340b1c1cf748a4
"[SCSI] scsi_transport_fc: Getting FC Port Speed in sync with FC-GS"
changed the semantics of FC_PORTSPEED defines to
FDMI port attributes of FC-HBA/SM-HBA
which is different from the previous bit reversed
Report Port Speed Capabilities (RPSC) ELS of FC-GS/FC-LS.

Zfcp showed "10 Gbit" instead of "4 Gbit" for supported_speeds.
It now uses explicit bit conversion as the other LLDs already
do, in order to be independent of the kernel bit semantics.
See also http://marc.info/?l=linux-scsi&m=134452926830730&w=2

Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com>
Reviewed-by: Martin Peschke <mpeschke@linux.vnet.ibm.com>
Cc: <stable@vger.kernel.org> #3.4+
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 32 insertions, 2 deletions

diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index e1c1efc2c5a0..30436d53d358 100644
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -437,6 +437,34 @@ void zfcp_fsf_req_dismiss_all(struct zfcp_adapter *adapter)
         }
 }
 
+#define ZFCP_FSF_PORTSPEED_1GBIT        (1 <<  0)
+#define ZFCP_FSF_PORTSPEED_2GBIT        (1 <<  1)
+#define ZFCP_FSF_PORTSPEED_4GBIT        (1 <<  2)
+#define ZFCP_FSF_PORTSPEED_10GBIT       (1 <<  3)
+#define ZFCP_FSF_PORTSPEED_8GBIT        (1 <<  4)
+#define ZFCP_FSF_PORTSPEED_16GBIT       (1 <<  5)
+#define ZFCP_FSF_PORTSPEED_NOT_NEGOTIATED (1 << 15)
+
+static u32 zfcp_fsf_convert_portspeed(u32 fsf_speed)
+{
+        u32 fdmi_speed = 0;
+        if (fsf_speed & ZFCP_FSF_PORTSPEED_1GBIT)
+                fdmi_speed |= FC_PORTSPEED_1GBIT;
+        if (fsf_speed & ZFCP_FSF_PORTSPEED_2GBIT)
+                fdmi_speed |= FC_PORTSPEED_2GBIT;
+        if (fsf_speed & ZFCP_FSF_PORTSPEED_4GBIT)
+                fdmi_speed |= FC_PORTSPEED_4GBIT;
+        if (fsf_speed & ZFCP_FSF_PORTSPEED_10GBIT)
+                fdmi_speed |= FC_PORTSPEED_10GBIT;
+        if (fsf_speed & ZFCP_FSF_PORTSPEED_8GBIT)
+                fdmi_speed |= FC_PORTSPEED_8GBIT;
+        if (fsf_speed & ZFCP_FSF_PORTSPEED_16GBIT)
+                fdmi_speed |= FC_PORTSPEED_16GBIT;
+        if (fsf_speed & ZFCP_FSF_PORTSPEED_NOT_NEGOTIATED)
+                fdmi_speed |= FC_PORTSPEED_NOT_NEGOTIATED;
+        return fdmi_speed;
+}
+
 static int zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *req)
 {
         struct fsf_qtcb_bottom_config *bottom = &req->qtcb->bottom.config;
@@ -456,7 +484,8 @@ static int zfcp_fsf_exchange_config_evaluate(struct zfcp_fsf_req *req)
         fc_host_port_name(shost) = nsp->fl_wwpn;
         fc_host_node_name(shost) = nsp->fl_wwnn;
         fc_host_port_id(shost) = ntoh24(bottom->s_id);
-        fc_host_speed(shost) = bottom->fc_link_speed;
+        fc_host_speed(shost) =
+                zfcp_fsf_convert_portspeed(bottom->fc_link_speed);
         fc_host_supported_classes(shost) = FC_COS_CLASS2 | FC_COS_CLASS3;
 
         adapter->hydra_version = bottom->adapter_type;
@@ -580,7 +609,8 @@ static void zfcp_fsf_exchange_port_evaluate(struct zfcp_fsf_req *req)
         } else
                 fc_host_permanent_port_name(shost) = fc_host_port_name(shost);
         fc_host_maxframe_size(shost) = bottom->maximum_frame_size;
-        fc_host_supported_speeds(shost) = bottom->supported_speed;
+        fc_host_supported_speeds(shost) =
+                zfcp_fsf_convert_portspeed(bottom->supported_speed);
         memcpy(fc_host_supported_fc4s(shost), bottom->supported_fc4_types,
                FC_FC4_LIST_SIZE);
         memcpy(fc_host_active_fc4s(shost), bottom->active_fc4_types,