1. 10 Sep, 2009 15 commits
  2. 05 Sep, 2009 3 commits
    • Vasu Dev's avatar
      [SCSI] fcoe, libfc: fully makes use of per cpu exch pool and then removes em_lock · b2f0091f
      Vasu Dev authored
      
      
      1. Updates fcoe_rcv() to queue incoming frames to the fcoe per
         cpu thread on which this frame's exch was originated and simply
         use current cpu for request exch not originated by initiator.
         It is redundant to add this code under CONFIG_SMP, so removes
         CONFIG_SMP uses around this code.
      
      2. Updates fc_exch_em_alloc, fc_exch_delete, fc_exch_find to use
         per cpu exch pools, here fc_exch_delete is rename of older
         fc_exch_mgr_delete_ep since ep/exch are now deleted in pools
         of EM and so brief new name is sufficient and better name.
      
         Updates these functions to map exch id to their index into exch
         pool using fc_cpu_mask, fc_cpu_order and EM min_xid.
         This mapping is as per detailed explanation about this in
         last patch and basically this is just as lower fc_cpu_mask
         bits of exch id as cpu number and upper bit sum of EM min_xid
         and exch index in pool.
      
         Uses pool next_index to keep track of exch allocation from
         pool along with pool_max_index as upper bound of exches array
         in pool.
      
      3. Adds exch pool ptr to fc_exch to free exch to its pool in
         fc_exch_delete.
      
      4. Updates fc_exch_mgr_reset to reset all exch pools of an EM,
         this required adding fc_exch_pool_reset func to reset exches
         in pool and then have fc_exch_mgr_reset call fc_exch_pool_reset
         for each pool within each EM for a lport.
      
      5. Removes no longer needed exches array, em_lock, next_xid, and
         total_exches from struct fc_exch_mgr, these are not needed after
         use of per cpu exch pool, also removes not used max_read,
         last_read from struct fc_exch_mgr.
      
      6. Updates locking notes for exch pool lock with fc_exch lock and
         uses pool lock in exch allocation, lookup and reset.
      Signed-off-by: default avatarVasu Dev <vasu.dev@intel.com>
      Signed-off-by: default avatarRobert Love <robert.w.love@intel.com>
      Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
      b2f0091f
    • Vasu Dev's avatar
      [SCSI] fcoe, libfc: adds per cpu exch pool within exchange manager(EM) · e4bc50be
      Vasu Dev authored
      
      
      Adds per cpu exch pool for these reasons:-
      
       1. Currently an EM instance is shared across all cpus to manage
          all exches for all cpus. This required em_lock across all
          cpus for an exch alloc, free, lookup and reset each frame
          and that made em_lock expensive, so instead having per cpu
          exch pool with their own per cpu pool lock will likely reduce
          locking contention in fast path for an exch alloc, free and
          lookup.
      
       2. Per cpu exch pool will likely improve cache hit ratio since
          all frames of an exch will be processed on the same cpu on
          which exch originated.
      
      This patch is only prep work to help in keeping complexity of next
      patch low, so this patch only sets up per cpu exch pool and related
      helper funcs to be used by next patch. The next patch fully makes
      use of per cpu exch pool in all code paths ie. tx, rx and reset.
      
      Divides per EM exch id range equally across all cpus to setup per
      cpu exch pool. This division is such that lower bits of exch id
      carries cpu number info on which exch originated, later a simple
      bitwise AND operation on exch id of incoming frame with fc_cpu_mask
      retrieves cpu number info to direct all frames to same cpu on which
      exch originated. This required a global fc_cpu_mask and fc_cpu_order
      initialized to max possible cpus number nr_cpu_ids rounded up to 2's
      power, this will be used in mapping exch id and exch ptr array
      index in pool during exch allocation, find or reset code paths.
      
      Adds a check in fc_exch_mgr_alloc() to ensure specified min_xid
      lower bits are zero since these bits are used to carry cpu info.
      
      Adds and initializes struct fc_exch_pool with all required fields
      to manage exches in pool.
      
      Allocates per cpu struct fc_exch_pool with memory for exches array
      for range of exches per pool. The exches array memory is followed
      by struct fc_exch_pool.
      
      Adds fc_exch_ptr_get/set() helper functions to get/set exch ptr in
      pool exches array at specified array index.
      
      Increases default FCOE_MAX_XID to 0x0FFF from 0x07EF, so that more
      exches are available per cpu after above described exch id range
      division across all cpus to each pool.
      Signed-off-by: default avatarVasu Dev <vasu.dev@intel.com>
      Signed-off-by: default avatarRobert Love <robert.w.love@intel.com>
      Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
      e4bc50be
    • Mike Christie's avatar
      [SCSI] iscsi_tcp: add new conn error to indicate tcp conn closed · d1af8a32
      Mike Christie authored
      
      
      If a target closed the connection, we will detect it in the
      state_changed or data_ready callout. This adds a new conn
      error value to use for this problem, so it is not confused
      with when the initiator throws a conn error and drops
      the connection.
      Signed-off-by: default avatarMike Christie <michaelc@cs.wisc.edu>
      Signed-off-by: default avatarJames Bottomley <James.Bottomley@suse.de>
      d1af8a32
  3. 22 Aug, 2009 10 commits
  4. 21 Jun, 2009 3 commits
  5. 15 Jun, 2009 1 commit
  6. 12 Jun, 2009 1 commit
    • James Smart's avatar
      [SCSI] FC Pass Thru support · 9e4f5e29
      James Smart authored
      Attached is the ELS/CT pass-thru patch for the FC Transport. The patch
      creates a generic framework that lays on top of bsg and the SGIO v4 ioctl
      in order to pass transaction requests to LLDD's.
      
      The interface supports the following operations:
        On an fc_host basis:
          Request login to the specified N_Port_ID, creating an fc_rport.
          Request logout of the specified N_Port_ID, deleting an fc_rport
          Send ELS request to specified N_Port_ID w/o requiring a login, and
            wait for ELS response.
          Send CT request to specified N_Port_ID and wait for CT response.
            Login is required, but LLDD is allowed to manage login and decide
            whether it stays in place after the request is satisfied.
          Vendor-Unique request. Allows a LLDD-specific request to be passed
            to the LLDD, and the passing of a response back to the application.
        On an fc_rport basis:
          Send ELS request to nport and wait for ELS response.
          Send CT request to nport and wait for CT response.
      
      The patch also exports several headers from include/scsi such that
      they can be available to user-space applications:
        include/scsi/scsi.h
        include/scsi/scsi_netlink.h
        include/scsi/scsi_netlink_fc.h
        include/scsi/scsi_bsg_fc.h
      
      For further information, refer to the last RFC:
      http://marc.info/?l=linux-scsi&m=123436574018579&w=2
      
      
      
      Note: Documentation is still spotty and will be added later.
      
      [bharrosh@panasas.com: update for new block API]
      Signed-off-by: default avatarJames Smart <james.smart@emulex.com>
      Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
      9e4f5e29
  7. 10 Jun, 2009 6 commits
  8. 09 Jun, 2009 1 commit