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IB/hfi1: Compute BTH only for RDMA_WRITE_LAST/SEND_LAST packet

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In hfi1_rc_rcv(), BTH is computed for all packets received.
However, it's only used for packets received with opcodes
RDMA_WRITE_LAST and SEND_LAST, and it is a costly operation.

Compute BTH only in the RDMA_WRITE_LAST/SEND_LAST code path
and let the compiler handle endianness conversion for bitwise
operations.

Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Sebastian Sanchez <sebastian.sanchez@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Sebastian Sanchez
2018-02-01 10:46:15 -08:00
committed by Jason Gunthorpe
parent 9636258f10
commit f150e2736f
7 changed files with 10 additions and 12 deletions
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3
drivers/infiniband/hw/qib/qib_rc.c
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@@ -1916,8 +1916,7 @@ send_last:
wc.port_num = 0;
/* Signal completion event if the solicited bit is set. */
rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
(ohdr->bth[0] &
cpu_to_be32(IB_BTH_SOLICITED)) != 0);
ib_bth_is_solicited(ohdr));
break;
case OP(RDMA_WRITE_FIRST):