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  1. 18 Oct, 2007 4 commits
  3. 16 Oct, 2007 4 commits
    • Anton Blanchard's avatar
      IPoIB: Use round_jiffies() for ah_reap_task · 69fc507a
      Anton Blanchard authored 
      Use round_jiffies() to align the 1 second ah_reap_task with other work
and potentially save power by sleeping cores for longer.
Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
      69fc507a
    • Sean Hefty's avatar
      RDMA/cma: Fix deadlock destroying listen requests · d02d1f53
      Sean Hefty authored 
      Deadlock condition reported by Kanoj Sarcar <kanoj@netxen.com>.
The deadlock occurs when a connection request arrives at the same
time that a wildcard listen is being destroyed.

A wildcard listen maintains per device listen requests for each
RDMA device in the system.  The per device listens are automatically
added and removed when RDMA devices are inserted or removed from
the system.

When a wildcard listen is destroyed, rdma_destroy_id() acquires
the rdma_cm's device mutex ('lock') to protect against hot-plug
events adding or removing per device listens.  It then tries to
destroy the per device listens by calling ib_destroy_cm_id() or
iw_destroy_cm_id().  It does this while holding the device mutex.

However, if the underlying iw/ib CM reports a connection request
while this is occurring, the rdma_cm callback function will try
to acquire the same device mutex.  Since we're in a callback,
the ib_destroy_cm_id() or iw_destroy_cm_id() calls will block until
their callback thread returns, but the callback is blocked waiting for
the device mutex.

Fix this by re-working how per device listens are destroyed.  Use
rdma_destroy_id(), which avoids the deadlock, in place of
cma_destroy_listen().  Additional synchronization is added to handle
device hot-plug events and ensure that the id is not destroyed twice.
Signed-off-by: default avatarSean Hefty <sean.hefty@intel.com>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
      d02d1f53
    • Sean Hefty's avatar
      RDMA/cma: Add locking around QP accesses · c5483388
      Sean Hefty authored 
      If a user allocates a QP on an rdma_cm_id, the rdma_cm will automatically
transition the QP through its states (RTR, RTS, error, etc.)  While the
QP state transitions are occurring, the QP itself must remain valid.
Provide locking around the QP pointer to prevent its destruction while
accessing the pointer.

This fixes an issue reported by Olaf Kirch from Oracle that resulted in
a system crash:

"An incoming connection arrives and we decide to tear down the nascent
 connection.  The remote ends decides to do the same.  We start to shut
 down the connection, and call rdma_destroy_qp on our cm_id. ... Now
 apparently a 'connect reject' message comes in from the other host,
 and cma_ib_handler() is called with an event of IB_CM_REJ_RECEIVED.
 It calls cma_modify_qp_err, which for some odd reason tries to modify
 the exact same QP we just destroyed."
Signed-off-by: default avatarSean Hefty <sean.hefty@intel.com>
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
      c5483388
    • Roland Dreier's avatar
      IB/mthca: Avoid alignment traps when writing doorbells · ab8403c4
      Roland Dreier authored 
      Architectures such as ia64 see alignment traps when doing a 64-bit 
read from __be32 doorbell[2] arrays to do doorbell writes in 
mthca_write64().  Fix this by just passing the two halves of the 
doorbell value into mthca_write64().  This actually improves the 
generated code by allowing the compiler to see what's going on better.
Signed-off-by: default avatarRoland Dreier <rolandd@cisco.com>
      ab8403c4
  5. 15 Oct, 2007 1 commit
  7. 14 Oct, 2007 31 commits
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