• Kiran Patil's avatar
    [SCSI] libfc: Enhancement to RPORT state machine applicable only for VN2VN mode · 48058481
    Kiran Patil authored
    
    
    Problem: Existing RPORT state machine continues witg FLOGI/PLOGI
    process only after it receices beacon from other end. Once claiming
    stage is over (either clain notify or clain repose), beacon is sent
    and state machine enters into operational mode where it initiates the
    rlogin process (FLOGI/PLOGI) to the peer but before this rlogin is
    initiated, exitsing implementation checks if it received beacon from
    other end, it beacon is not received yet, rlogin process is not
    initiated. Other end initiates FLOGI but peer end keeps on rejecting
    FLOGI, hence after 3 retries other end deletes associated rport, then
    sends a beacon. Once the beacon is received, peer end now initiates
    rlogin to the peer end but since associated rport is deleted FLOGI is
    neither accepted nor the reject response send out because rport is
    deleted. Hence unable to proceed withg FLOGI/PLOGI process and fails
    to establish VN2VN connection.
    
    Fix: VN2VN spec is not standard yet but based on exitsing collateral
    on T11, it appears that, both end shall send beacon and enter into
    'operational mode' without explictly waiting for beacon from other
    end. Fix is to allow the RPORT login process as long as respective
    RPORT is created (as part of claim notification / claim response) even
    though state of RPORT is INIT. Means don't wait for beacon from peer
    end, if peer end initiates FLOGI (means peer end exist and
    responding).
    
    Notes: This patch is preparing the FCoE stack for target wrt
    offload. This is generic patch and harmless even if applied on storage
    initiator because 'else if' condition of function 'fcoe_oem_found'
    shall evaluate to TRUE only for targets.
    
    Dependencies: None
    Signed-off-by: default avatarKiran Patil <kiran.patil@intel.com>
    Signed-off-by: default avatarRobert Love <robert.w.love@intel.com>
    Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
    48058481
fc_rport.c 54.2 KB