diff options
| author | Mike Marciniszyn <mike.marciniszyn@qlogic.com> | 2011-09-23 13:16:29 -0400 |
|---|---|---|
| committer | Roland Dreier <roland@purestorage.com> | 2011-10-21 09:38:49 -0700 |
| commit | 2fc109c890f7d9620cfed8d439be071a8b2a8bbd (patch) | |
| tree | 4d00e76ae4ea129a68321993bdb4190b3c7bca02 | |
| parent | 53ab1c6498371723c31b18400fab10a902a15a63 (diff) | |
IB/qib: Optimize RC/UC code by IB operation
The memset for zeroing work completions had been unconditional.
This patch removes the memset and moves the zeroing into the work
completion with a more explicit field by field set. With this patch,
non-ONLY/non-LAST packets will avoid the overhead since they will not
generate a completion.
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@qlogic.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
| -rw-r--r-- | drivers/infiniband/hw/qib/qib_rc.c | 19 | ||||
| -rw-r--r-- | drivers/infiniband/hw/qib/qib_uc.c | 14 |
2 files changed, 24 insertions, 9 deletions
diff --git a/drivers/infiniband/hw/qib/qib_rc.c b/drivers/infiniband/hw/qib/qib_rc.c index eca0c41f1226..5c1c49b299f1 100644 --- a/drivers/infiniband/hw/qib/qib_rc.c +++ b/drivers/infiniband/hw/qib/qib_rc.c @@ -1955,8 +1955,6 @@ void qib_rc_rcv(struct qib_ctxtdata *rcd, struct qib_ib_header *hdr, break; } - memset(&wc, 0, sizeof wc); - if (qp->state == IB_QPS_RTR && !(qp->r_flags & QIB_R_COMM_EST)) { qp->r_flags |= QIB_R_COMM_EST; if (qp->ibqp.event_handler) { @@ -2009,16 +2007,19 @@ send_middle: goto rnr_nak; qp->r_rcv_len = 0; if (opcode == OP(SEND_ONLY)) - goto send_last; - /* FALLTHROUGH */ + goto no_immediate_data; + /* FALLTHROUGH for SEND_ONLY_WITH_IMMEDIATE */ case OP(SEND_LAST_WITH_IMMEDIATE): send_last_imm: wc.ex.imm_data = ohdr->u.imm_data; hdrsize += 4; wc.wc_flags = IB_WC_WITH_IMM; - /* FALLTHROUGH */ + goto send_last; case OP(SEND_LAST): case OP(RDMA_WRITE_LAST): +no_immediate_data: + wc.wc_flags = 0; + wc.ex.imm_data = 0; send_last: /* Get the number of bytes the message was padded by. */ pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; @@ -2051,6 +2052,12 @@ send_last: wc.src_qp = qp->remote_qpn; wc.slid = qp->remote_ah_attr.dlid; wc.sl = qp->remote_ah_attr.sl; + /* zero fields that are N/A */ + wc.vendor_err = 0; + wc.pkey_index = 0; + wc.dlid_path_bits = 0; + wc.port_num = 0; + wc.csum_ok = 0; /* Signal completion event if the solicited bit is set. */ qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, (ohdr->bth[0] & @@ -2089,7 +2096,7 @@ send_last: if (opcode == OP(RDMA_WRITE_FIRST)) goto send_middle; else if (opcode == OP(RDMA_WRITE_ONLY)) - goto send_last; + goto no_immediate_data; ret = qib_get_rwqe(qp, 1); if (ret < 0) goto nack_op_err; diff --git a/drivers/infiniband/hw/qib/qib_uc.c b/drivers/infiniband/hw/qib/qib_uc.c index 32ccf3c824ca..d31f33a99887 100644 --- a/drivers/infiniband/hw/qib/qib_uc.c +++ b/drivers/infiniband/hw/qib/qib_uc.c @@ -270,7 +270,6 @@ void qib_uc_rcv(struct qib_ibport *ibp, struct qib_ib_header *hdr, psn = be32_to_cpu(ohdr->bth[2]); opcode >>= 24; - memset(&wc, 0, sizeof wc); /* Compare the PSN verses the expected PSN. */ if (unlikely(qib_cmp24(psn, qp->r_psn) != 0)) { @@ -370,7 +369,7 @@ send_first: } qp->r_rcv_len = 0; if (opcode == OP(SEND_ONLY)) - goto send_last; + goto no_immediate_data; else if (opcode == OP(SEND_ONLY_WITH_IMMEDIATE)) goto send_last_imm; /* FALLTHROUGH */ @@ -389,8 +388,11 @@ send_last_imm: wc.ex.imm_data = ohdr->u.imm_data; hdrsize += 4; wc.wc_flags = IB_WC_WITH_IMM; - /* FALLTHROUGH */ + goto send_last; case OP(SEND_LAST): +no_immediate_data: + wc.ex.imm_data = 0; + wc.wc_flags = 0; send_last: /* Get the number of bytes the message was padded by. */ pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; @@ -418,6 +420,12 @@ last_imm: wc.src_qp = qp->remote_qpn; wc.slid = qp->remote_ah_attr.dlid; wc.sl = qp->remote_ah_attr.sl; + /* zero fields that are N/A */ + wc.vendor_err = 0; + wc.pkey_index = 0; + wc.dlid_path_bits = 0; + wc.port_num = 0; + wc.csum_ok = 0; /* Signal completion event if the solicited bit is set. */ qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, (ohdr->bth[0] & |