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@@ -32,6 +32,7 @@
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*/
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#include "ipath_verbs.h"
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+#include "ips_common.h"
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/*
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* Convert the AETH RNR timeout code into the number of milliseconds.
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@@ -188,7 +189,6 @@ bail:
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/**
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* ipath_ruc_loopback - handle UC and RC lookback requests
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* @sqp: the loopback QP
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- * @wc: the work completion entry
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*
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* This is called from ipath_do_uc_send() or ipath_do_rc_send() to
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* forward a WQE addressed to the same HCA.
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@@ -197,13 +197,14 @@ bail:
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* receive interrupts since this is a connected protocol and all packets
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* will pass through here.
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*/
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-void ipath_ruc_loopback(struct ipath_qp *sqp, struct ib_wc *wc)
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+static void ipath_ruc_loopback(struct ipath_qp *sqp)
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{
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struct ipath_ibdev *dev = to_idev(sqp->ibqp.device);
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struct ipath_qp *qp;
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struct ipath_swqe *wqe;
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struct ipath_sge *sge;
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unsigned long flags;
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+ struct ib_wc wc;
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u64 sdata;
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qp = ipath_lookup_qpn(&dev->qp_table, sqp->remote_qpn);
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@@ -234,8 +235,8 @@ again:
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wqe = get_swqe_ptr(sqp, sqp->s_last);
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spin_unlock_irqrestore(&sqp->s_lock, flags);
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- wc->wc_flags = 0;
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- wc->imm_data = 0;
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+ wc.wc_flags = 0;
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+ wc.imm_data = 0;
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sqp->s_sge.sge = wqe->sg_list[0];
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sqp->s_sge.sg_list = wqe->sg_list + 1;
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@@ -243,8 +244,8 @@ again:
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sqp->s_len = wqe->length;
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switch (wqe->wr.opcode) {
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case IB_WR_SEND_WITH_IMM:
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- wc->wc_flags = IB_WC_WITH_IMM;
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- wc->imm_data = wqe->wr.imm_data;
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+ wc.wc_flags = IB_WC_WITH_IMM;
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+ wc.imm_data = wqe->wr.imm_data;
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/* FALLTHROUGH */
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case IB_WR_SEND:
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spin_lock_irqsave(&qp->r_rq.lock, flags);
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@@ -255,7 +256,7 @@ again:
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if (qp->ibqp.qp_type == IB_QPT_UC)
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goto send_comp;
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if (sqp->s_rnr_retry == 0) {
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- wc->status = IB_WC_RNR_RETRY_EXC_ERR;
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+ wc.status = IB_WC_RNR_RETRY_EXC_ERR;
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goto err;
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}
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if (sqp->s_rnr_retry_cnt < 7)
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@@ -270,8 +271,8 @@ again:
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break;
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case IB_WR_RDMA_WRITE_WITH_IMM:
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- wc->wc_flags = IB_WC_WITH_IMM;
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- wc->imm_data = wqe->wr.imm_data;
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+ wc.wc_flags = IB_WC_WITH_IMM;
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+ wc.imm_data = wqe->wr.imm_data;
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spin_lock_irqsave(&qp->r_rq.lock, flags);
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if (!ipath_get_rwqe(qp, 1))
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goto rnr_nak;
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@@ -285,20 +286,20 @@ again:
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wqe->wr.wr.rdma.rkey,
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IB_ACCESS_REMOTE_WRITE))) {
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acc_err:
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- wc->status = IB_WC_REM_ACCESS_ERR;
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+ wc.status = IB_WC_REM_ACCESS_ERR;
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err:
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- wc->wr_id = wqe->wr.wr_id;
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- wc->opcode = ib_ipath_wc_opcode[wqe->wr.opcode];
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- wc->vendor_err = 0;
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- wc->byte_len = 0;
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- wc->qp_num = sqp->ibqp.qp_num;
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- wc->src_qp = sqp->remote_qpn;
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- wc->pkey_index = 0;
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- wc->slid = sqp->remote_ah_attr.dlid;
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- wc->sl = sqp->remote_ah_attr.sl;
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- wc->dlid_path_bits = 0;
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- wc->port_num = 0;
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- ipath_sqerror_qp(sqp, wc);
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+ wc.wr_id = wqe->wr.wr_id;
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+ wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode];
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+ wc.vendor_err = 0;
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+ wc.byte_len = 0;
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+ wc.qp_num = sqp->ibqp.qp_num;
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+ wc.src_qp = sqp->remote_qpn;
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+ wc.pkey_index = 0;
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+ wc.slid = sqp->remote_ah_attr.dlid;
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+ wc.sl = sqp->remote_ah_attr.sl;
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+ wc.dlid_path_bits = 0;
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+ wc.port_num = 0;
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+ ipath_sqerror_qp(sqp, &wc);
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goto done;
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}
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break;
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@@ -374,22 +375,22 @@ again:
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goto send_comp;
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if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM)
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- wc->opcode = IB_WC_RECV_RDMA_WITH_IMM;
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+ wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
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else
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- wc->opcode = IB_WC_RECV;
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- wc->wr_id = qp->r_wr_id;
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- wc->status = IB_WC_SUCCESS;
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- wc->vendor_err = 0;
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- wc->byte_len = wqe->length;
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- wc->qp_num = qp->ibqp.qp_num;
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- wc->src_qp = qp->remote_qpn;
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+ wc.opcode = IB_WC_RECV;
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+ wc.wr_id = qp->r_wr_id;
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+ wc.status = IB_WC_SUCCESS;
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+ wc.vendor_err = 0;
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+ wc.byte_len = wqe->length;
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+ wc.qp_num = qp->ibqp.qp_num;
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+ wc.src_qp = qp->remote_qpn;
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/* XXX do we know which pkey matched? Only needed for GSI. */
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- wc->pkey_index = 0;
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- wc->slid = qp->remote_ah_attr.dlid;
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- wc->sl = qp->remote_ah_attr.sl;
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- wc->dlid_path_bits = 0;
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+ wc.pkey_index = 0;
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+ wc.slid = qp->remote_ah_attr.dlid;
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+ wc.sl = qp->remote_ah_attr.sl;
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+ wc.dlid_path_bits = 0;
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/* Signal completion event if the solicited bit is set. */
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- ipath_cq_enter(to_icq(qp->ibqp.recv_cq), wc,
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+ ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc,
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wqe->wr.send_flags & IB_SEND_SOLICITED);
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send_comp:
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@@ -397,19 +398,19 @@ send_comp:
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if (!test_bit(IPATH_S_SIGNAL_REQ_WR, &sqp->s_flags) ||
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(wqe->wr.send_flags & IB_SEND_SIGNALED)) {
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- wc->wr_id = wqe->wr.wr_id;
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- wc->status = IB_WC_SUCCESS;
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- wc->opcode = ib_ipath_wc_opcode[wqe->wr.opcode];
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- wc->vendor_err = 0;
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- wc->byte_len = wqe->length;
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- wc->qp_num = sqp->ibqp.qp_num;
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- wc->src_qp = 0;
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- wc->pkey_index = 0;
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- wc->slid = 0;
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- wc->sl = 0;
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- wc->dlid_path_bits = 0;
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- wc->port_num = 0;
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- ipath_cq_enter(to_icq(sqp->ibqp.send_cq), wc, 0);
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+ wc.wr_id = wqe->wr.wr_id;
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+ wc.status = IB_WC_SUCCESS;
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+ wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode];
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+ wc.vendor_err = 0;
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+ wc.byte_len = wqe->length;
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+ wc.qp_num = sqp->ibqp.qp_num;
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+ wc.src_qp = 0;
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+ wc.pkey_index = 0;
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+ wc.slid = 0;
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+ wc.sl = 0;
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+ wc.dlid_path_bits = 0;
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+ wc.port_num = 0;
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+ ipath_cq_enter(to_icq(sqp->ibqp.send_cq), &wc, 0);
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}
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/* Update s_last now that we are finished with the SWQE */
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@@ -455,11 +456,11 @@ void ipath_no_bufs_available(struct ipath_qp *qp, struct ipath_ibdev *dev)
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}
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/**
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- * ipath_post_rc_send - post RC and UC sends
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+ * ipath_post_ruc_send - post RC and UC sends
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* @qp: the QP to post on
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* @wr: the work request to send
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*/
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-int ipath_post_rc_send(struct ipath_qp *qp, struct ib_send_wr *wr)
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+int ipath_post_ruc_send(struct ipath_qp *qp, struct ib_send_wr *wr)
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{
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struct ipath_swqe *wqe;
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unsigned long flags;
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@@ -534,13 +535,149 @@ int ipath_post_rc_send(struct ipath_qp *qp, struct ib_send_wr *wr)
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qp->s_head = next;
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spin_unlock_irqrestore(&qp->s_lock, flags);
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- if (qp->ibqp.qp_type == IB_QPT_UC)
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- ipath_do_uc_send((unsigned long) qp);
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- else
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- ipath_do_rc_send((unsigned long) qp);
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+ ipath_do_ruc_send((unsigned long) qp);
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ret = 0;
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bail:
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return ret;
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}
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+
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+/**
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+ * ipath_make_grh - construct a GRH header
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+ * @dev: a pointer to the ipath device
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+ * @hdr: a pointer to the GRH header being constructed
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+ * @grh: the global route address to send to
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+ * @hwords: the number of 32 bit words of header being sent
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+ * @nwords: the number of 32 bit words of data being sent
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+ *
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+ * Return the size of the header in 32 bit words.
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+ */
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+u32 ipath_make_grh(struct ipath_ibdev *dev, struct ib_grh *hdr,
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+ struct ib_global_route *grh, u32 hwords, u32 nwords)
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+{
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+ hdr->version_tclass_flow =
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+ cpu_to_be32((6 << 28) |
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+ (grh->traffic_class << 20) |
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+ grh->flow_label);
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+ hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2);
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+ /* next_hdr is defined by C8-7 in ch. 8.4.1 */
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+ hdr->next_hdr = 0x1B;
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+ hdr->hop_limit = grh->hop_limit;
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+ /* The SGID is 32-bit aligned. */
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+ hdr->sgid.global.subnet_prefix = dev->gid_prefix;
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+ hdr->sgid.global.interface_id = ipath_layer_get_guid(dev->dd);
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+ hdr->dgid = grh->dgid;
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+
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+ /* GRH header size in 32-bit words. */
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+ return sizeof(struct ib_grh) / sizeof(u32);
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+}
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+
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+/**
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+ * ipath_do_ruc_send - perform a send on an RC or UC QP
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+ * @data: contains a pointer to the QP
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+ *
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+ * Process entries in the send work queue until credit or queue is
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+ * exhausted. Only allow one CPU to send a packet per QP (tasklet).
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+ * Otherwise, after we drop the QP s_lock, two threads could send
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+ * packets out of order.
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+ */
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+void ipath_do_ruc_send(unsigned long data)
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+{
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+ struct ipath_qp *qp = (struct ipath_qp *)data;
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+ struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
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+ unsigned long flags;
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+ u16 lrh0;
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+ u32 nwords;
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+ u32 extra_bytes;
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+ u32 bth0;
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+ u32 bth2;
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+ u32 pmtu = ib_mtu_enum_to_int(qp->path_mtu);
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+ struct ipath_other_headers *ohdr;
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+
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+ if (test_and_set_bit(IPATH_S_BUSY, &qp->s_flags))
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+ goto bail;
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+
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+ if (unlikely(qp->remote_ah_attr.dlid ==
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+ ipath_layer_get_lid(dev->dd))) {
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+ ipath_ruc_loopback(qp);
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+ goto clear;
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+ }
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+
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+ ohdr = &qp->s_hdr.u.oth;
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+ if (qp->remote_ah_attr.ah_flags & IB_AH_GRH)
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+ ohdr = &qp->s_hdr.u.l.oth;
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+
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+again:
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+ /* Check for a constructed packet to be sent. */
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+ if (qp->s_hdrwords != 0) {
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+ /*
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+ * If no PIO bufs are available, return. An interrupt will
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+ * call ipath_ib_piobufavail() when one is available.
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+ */
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+ if (ipath_verbs_send(dev->dd, qp->s_hdrwords,
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+ (u32 *) &qp->s_hdr, qp->s_cur_size,
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+ qp->s_cur_sge)) {
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+ ipath_no_bufs_available(qp, dev);
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+ goto bail;
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+ }
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+ dev->n_unicast_xmit++;
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+ /* Record that we sent the packet and s_hdr is empty. */
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+ qp->s_hdrwords = 0;
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+ }
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+
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+ /*
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+ * The lock is needed to synchronize between setting
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+ * qp->s_ack_state, resend timer, and post_send().
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+ */
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+ spin_lock_irqsave(&qp->s_lock, flags);
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+
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+ /* Sending responses has higher priority over sending requests. */
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+ if (qp->s_ack_state != IB_OPCODE_RC_ACKNOWLEDGE &&
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+ (bth0 = ipath_make_rc_ack(qp, ohdr, pmtu)) != 0)
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+ bth2 = qp->s_ack_psn++ & IPS_PSN_MASK;
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+ else if (!((qp->ibqp.qp_type == IB_QPT_RC) ?
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+ ipath_make_rc_req(qp, ohdr, pmtu, &bth0, &bth2) :
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+ ipath_make_uc_req(qp, ohdr, pmtu, &bth0, &bth2))) {
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+ /*
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+ * Clear the busy bit before unlocking to avoid races with
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+ * adding new work queue items and then failing to process
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+ * them.
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+ */
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+ clear_bit(IPATH_S_BUSY, &qp->s_flags);
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+ spin_unlock_irqrestore(&qp->s_lock, flags);
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+ goto bail;
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+ }
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+
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+ spin_unlock_irqrestore(&qp->s_lock, flags);
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+
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+ /* Construct the header. */
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+ extra_bytes = (4 - qp->s_cur_size) & 3;
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+ nwords = (qp->s_cur_size + extra_bytes) >> 2;
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+ lrh0 = IPS_LRH_BTH;
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+ if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) {
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+ qp->s_hdrwords += ipath_make_grh(dev, &qp->s_hdr.u.l.grh,
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+ &qp->remote_ah_attr.grh,
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+ qp->s_hdrwords, nwords);
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+ lrh0 = IPS_LRH_GRH;
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+ }
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+ lrh0 |= qp->remote_ah_attr.sl << 4;
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+ qp->s_hdr.lrh[0] = cpu_to_be16(lrh0);
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+ qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid);
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+ qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords +
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+ SIZE_OF_CRC);
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+ qp->s_hdr.lrh[3] = cpu_to_be16(ipath_layer_get_lid(dev->dd));
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+ bth0 |= ipath_layer_get_pkey(dev->dd, qp->s_pkey_index);
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+ bth0 |= extra_bytes << 20;
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+ ohdr->bth[0] = cpu_to_be32(bth0);
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+ ohdr->bth[1] = cpu_to_be32(qp->remote_qpn);
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+ ohdr->bth[2] = cpu_to_be32(bth2);
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+
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+ /* Check for more work to do. */
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+ goto again;
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+
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+clear:
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+ clear_bit(IPATH_S_BUSY, &qp->s_flags);
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+bail:
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+ return;
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+}
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Bryan O'Sullivan