The qp priv rcd pointer doesn't match the context being used for verbs
causing issues when 9B and kdeth packets are processed by different
receive contexts and hence different CPUs.

When running on different CPUs the following panic can occur:

 WARNING: CPU: 3 PID: 2584 at lib/list_debug.c:59 __list_del_entry+0xa1/0xd0
 list_del corruption. prev->next should be ffff9a7ac31f7a30, but was ffff9a7c3bc89230
 CPU: 3 PID: 2584 Comm: z_wr_iss Kdump: loaded Tainted: P           OE  ------------   3.10.0-862.2.3.el7_lustre.x86_64 #1
 Call Trace:
  <IRQ>  [<ffffffffb7b0d78e>] dump_stack+0x19/0x1b
  [<ffffffffb74916d8>] __warn+0xd8/0x100
  [<ffffffffb749175f>] warn_slowpath_fmt+0x5f/0x80
  [<ffffffffb7768671>] __list_del_entry+0xa1/0xd0
  [<ffffffffc0c7a945>] process_rcv_qp_work+0xb5/0x160 [hfi1]
  [<ffffffffc0c7bc2b>] handle_receive_interrupt_nodma_rtail+0x20b/0x2b0 [hfi1]
  [<ffffffffc0c70683>] receive_context_interrupt+0x23/0x40 [hfi1]
  [<ffffffffb7540a94>] __handle_irq_event_percpu+0x44/0x1c0
  [<ffffffffb7540c42>] handle_irq_event_percpu+0x32/0x80
  [<ffffffffb7540ccc>] handle_irq_event+0x3c/0x60
  [<ffffffffb7543a1f>] handle_edge_irq+0x7f/0x150
  [<ffffffffb742d504>] handle_irq+0xe4/0x1a0
  [<ffffffffb7b23f7d>] do_IRQ+0x4d/0xf0
  [<ffffffffb7b16362>] common_interrupt+0x162/0x162
  <EOI>  [<ffffffffb775a326>] ? memcpy+0x6/0x110
  [<ffffffffc109210d>] ? abd_copy_from_buf_off_cb+0x1d/0x30 [zfs]
  [<ffffffffc10920f0>] ? abd_copy_to_buf_off_cb+0x30/0x30 [zfs]
  [<ffffffffc1093257>] abd_iterate_func+0x97/0x120 [zfs]
  [<ffffffffc10934d9>] abd_copy_from_buf_off+0x39/0x60 [zfs]
  [<ffffffffc109b828>] arc_write_ready+0x178/0x300 [zfs]
  [<ffffffffb7b11032>] ? mutex_lock+0x12/0x2f
  [<ffffffffb7b11032>] ? mutex_lock+0x12/0x2f
  [<ffffffffc1164d05>] zio_ready+0x65/0x3d0 [zfs]
  [<ffffffffc04d725e>] ? tsd_get_by_thread+0x2e/0x50 [spl]
  [<ffffffffc04d1318>] ? taskq_member+0x18/0x30 [spl]
  [<ffffffffc115ef22>] zio_execute+0xa2/0x100 [zfs]
  [<ffffffffc04d1d2c>] taskq_thread+0x2ac/0x4f0 [spl]
  [<ffffffffb74cee80>] ? wake_up_state+0x20/0x20
  [<ffffffffc115ee80>] ? zio_taskq_member.isra.7.constprop.10+0x80/0x80 [zfs]
  [<ffffffffc04d1a80>] ? taskq_thread_spawn+0x60/0x60 [spl]
  [<ffffffffb74bae31>] kthread+0xd1/0xe0
  [<ffffffffb74bad60>] ? insert_kthread_work+0x40/0x40
  [<ffffffffb7b1f5f7>] ret_from_fork_nospec_begin+0x21/0x21
  [<ffffffffb74bad60>] ? insert_kthread_work+0x40/0x40

Fix by reading the map entry in the same manner as the hardware so that
the kdeth and verbs contexts match.

Cc: <stable@vger.kernel.org>
Fixes: 5190f052 ("IB/hfi1: Allow the driver to initialize QP priv struct")
Reviewed-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>