IB/hfi1: Fix alloc failure with larger txqueuelen

The following allocation with large txqueuelen will result in the
following warning:

  Call Trace:
   __alloc_pages_nodemask+0x283/0x2c0
   kmalloc_large_node+0x3c/0xa0
   __kmalloc_node+0x22a/0x2f0
   hfi1_ipoib_txreq_init+0x19f/0x330 [hfi1]
   hfi1_ipoib_setup_rn+0xd3/0x1a0 [hfi1]
   rdma_init_netdev+0x5a/0x80 [ib_core]
   ipoib_intf_init+0x6c/0x350 [ib_ipoib]
   ipoib_intf_alloc+0x5c/0xc0 [ib_ipoib]
   ipoib_add_one+0xbe/0x300 [ib_ipoib]
   add_client_context+0x12c/0x1a0 [ib_core]
   ib_register_client+0x147/0x190 [ib_core]
   ipoib_init_module+0xdd/0x132 [ib_ipoib]
   do_one_initcall+0x46/0x1c3
   do_init_module+0x5a/0x220
   load_module+0x14c5/0x17f0
   __do_sys_init_module+0x13b/0x180
   do_syscall_64+0x5b/0x1a0
   entry_SYSCALL_64_after_hwframe+0x65/0xca

For ipoib, the txqueuelen is modified with the module parameter
send_queue_size.

Fix by changing to use kv versions of the same allocator to handle the
large allocations.  The allocation embeds a hdr struct that is dma mapped.
Change that struct to a pointer to a kzalloced struct.

Cc: stable@vger.kernel.org
Fixes: d99dc602 ("IB/hfi1: Add functions to transmit datagram ipoib packets")
Link: https://lore.kernel.org/r/1642287756-182313-3-git-send-email-mike.marciniszyn@cornelisnetworks.com


Reviewed-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>