[SCSI] libfc: update fc_host mfs along with updating lport->mfs

Currently fc_host mfs is not getting updated in
case its changed during FLOGI and that leaves fc_host
to show its initial old value in sysfs, so instead
have fc_host mfs updated along with updating lport mfs
during FLOGI.

Also in case of bad mfs during flogi, error out
instead of continuing with flogi.

[ Changes made by Robert Love: condition to '>=' and
  added printing of lport->mfs in DBG statement. FLOGI
  resp processing failed without being able to compare
  FCoE MFS 2112 against an incoming MFS of 2112 ]

Signed-off-by: Vasu Dev <vasu.dev@intel.com>
Tested-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/drivers/scsi/libfc/fc_lport.c b/drivers/scsi/libfc/fc_lport.c
index 9a0b2a9caad6..4f7ef76aa795 100644
--- a/drivers/scsi/libfc/fc_lport.c
+++ b/drivers/scsi/libfc/fc_lport.c
@@ -1743,8 +1743,16 @@ void fc_lport_flogi_resp(struct fc_seq *sp, struct fc_frame *fp,
         mfs = ntohs(flp->fl_csp.sp_bb_data) &
                 FC_SP_BB_DATA_MASK;
         if (mfs >= FC_SP_MIN_MAX_PAYLOAD &&
-            mfs < lport->mfs)
+            mfs <= lport->mfs) {
                 lport->mfs = mfs;
+                fc_host_maxframe_size(lport->host) = mfs;
+        } else {
+                FC_LPORT_DBG(lport, "FLOGI bad mfs:%hu response, "
+                             "lport->mfs:%hu\n", mfs, lport->mfs);
+                fc_lport_error(lport, fp);
+                goto err;
+        }
+
         csp_flags = ntohs(flp->fl_csp.sp_features);
         r_a_tov = ntohl(flp->fl_csp.sp_r_a_tov);
         e_d_tov = ntohl(flp->fl_csp.sp_e_d_tov);