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

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: NMike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: NSebastian Sanchez <sebastian.sanchez@intel.com>
Signed-off-by: NDennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: NJason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/hfi1/rc.c

@@ -2035,7 +2035,6 @@ void hfi1_rc_rcv(struct hfi1_packet *packet)
 	struct rvt_qp *qp = packet->qp;
 	struct hfi1_ibport *ibp = rcd_to_iport(rcd);
 	struct ib_other_headers *ohdr = packet->ohdr;
-	u32 bth0 = be32_to_cpu(ohdr->bth[0]);
 	u32 opcode = packet->opcode;
 	u32 hdrsize = packet->hlen;
 	u32 psn = ib_bth_get_psn(packet->ohdr);
@@ -2233,7 +2232,7 @@ void hfi1_rc_rcv(struct hfi1_packet *packet)
 		wc.port_num = 0;
 		/* Signal completion event if the solicited bit is set. */
 		rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
-			     (bth0 & IB_BTH_SOLICITED) != 0);
+			     ib_bth_is_solicited(ohdr));
 		break;
 
 	case OP(RDMA_WRITE_ONLY):

drivers/infiniband/hw/hfi1/uc.c

@@ -478,8 +478,7 @@ void hfi1_uc_rcv(struct hfi1_packet *packet)
 		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):

drivers/infiniband/hw/hfi1/ud.c

@@ -1045,8 +1045,7 @@ void hfi1_ud_rcv(struct hfi1_packet *packet)
 	wc.port_num = qp->port_num;
 	/* 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));
 	return;
 
 drop:

drivers/infiniband/hw/qib/qib_rc.c

@@ -1916,8 +1916,7 @@ void qib_rc_rcv(struct qib_ctxtdata *rcd, struct ib_header *hdr,
 		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):

drivers/infiniband/hw/qib/qib_uc.c

@@ -403,8 +403,7 @@ void qib_uc_rcv(struct qib_ibport *ibp, struct ib_header *hdr,
 		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):

drivers/infiniband/hw/qib/qib_ud.c

@@ -581,8 +581,7 @@ void qib_ud_rcv(struct qib_ibport *ibp, struct ib_header *hdr,
 	wc.port_num = qp->port_num;
 	/* 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));
 	return;
 
 drop:

include/rdma/ib_hdrs.h

@@ -331,4 +331,8 @@ static inline u8 ib_bth_get_tver(struct ib_other_headers *ohdr)
 		    IB_BTH_TVER_MASK);
 }
 
+static inline bool ib_bth_is_solicited(struct ib_other_headers *ohdr)
+{
+	return ohdr->bth[0] & cpu_to_be32(IB_BTH_SOLICITED);
+}
 #endif                          /* IB_HDRS_H */