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path: root/drivers/infiniband/hw/hfi1/tid_rdma.c
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Diffstat (limited to 'drivers/infiniband/hw/hfi1/tid_rdma.c')
-rw-r--r--drivers/infiniband/hw/hfi1/tid_rdma.c211
1 files changed, 211 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/hfi1/tid_rdma.c b/drivers/infiniband/hw/hfi1/tid_rdma.c
index cb6321b0d2c9..44c5c0010888 100644
--- a/drivers/infiniband/hw/hfi1/tid_rdma.c
+++ b/drivers/infiniband/hw/hfi1/tid_rdma.c
@@ -331,6 +331,7 @@ int hfi1_qp_priv_init(struct rvt_dev_info *rdi, struct rvt_qp *qp,
qpriv->r_tid_tail = HFI1_QP_WQE_INVALID;
qpriv->r_tid_ack = HFI1_QP_WQE_INVALID;
qpriv->r_tid_alloc = HFI1_QP_WQE_INVALID;
+ atomic_set(&qpriv->n_requests, 0);
atomic_set(&qpriv->n_tid_requests, 0);
timer_setup(&qpriv->s_tid_timer, hfi1_tid_timeout, 0);
timer_setup(&qpriv->s_tid_retry_timer, hfi1_tid_retry_timeout, 0);
@@ -4803,3 +4804,213 @@ void hfi1_rc_rcv_tid_rdma_resync(struct hfi1_packet *packet)
bail:
spin_unlock_irqrestore(&qp->s_lock, flags);
}
+
+/*
+ * Call this function when the last TID RDMA WRITE DATA packet for a request
+ * is built.
+ */
+static void update_tid_tail(struct rvt_qp *qp)
+ __must_hold(&qp->s_lock)
+{
+ struct hfi1_qp_priv *priv = qp->priv;
+ u32 i;
+ struct rvt_swqe *wqe;
+
+ lockdep_assert_held(&qp->s_lock);
+ /* Can't move beyond s_tid_cur */
+ if (priv->s_tid_tail == priv->s_tid_cur)
+ return;
+ for (i = priv->s_tid_tail + 1; ; i++) {
+ if (i == qp->s_size)
+ i = 0;
+
+ if (i == priv->s_tid_cur)
+ break;
+ wqe = rvt_get_swqe_ptr(qp, i);
+ if (wqe->wr.opcode == IB_WR_TID_RDMA_WRITE)
+ break;
+ }
+ priv->s_tid_tail = i;
+ priv->s_state = TID_OP(WRITE_RESP);
+}
+
+int hfi1_make_tid_rdma_pkt(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
+ __must_hold(&qp->s_lock)
+{
+ struct hfi1_qp_priv *priv = qp->priv;
+ struct rvt_swqe *wqe;
+ u32 bth1 = 0, bth2 = 0, hwords = 5, len, middle = 0;
+ struct ib_other_headers *ohdr;
+ struct rvt_sge_state *ss = &qp->s_sge;
+ struct rvt_ack_entry *e = &qp->s_ack_queue[qp->s_tail_ack_queue];
+ struct tid_rdma_request *req = ack_to_tid_req(e);
+ bool last = false;
+ u8 opcode = TID_OP(WRITE_DATA);
+
+ lockdep_assert_held(&qp->s_lock);
+ /*
+ * Prioritize the sending of the requests and responses over the
+ * sending of the TID RDMA data packets.
+ */
+ if (((atomic_read(&priv->n_tid_requests) < HFI1_TID_RDMA_WRITE_CNT) &&
+ atomic_read(&priv->n_requests) &&
+ !(qp->s_flags & (RVT_S_BUSY | RVT_S_WAIT_ACK |
+ HFI1_S_ANY_WAIT_IO))) ||
+ (e->opcode == TID_OP(WRITE_REQ) && req->cur_seg < req->alloc_seg &&
+ !(qp->s_flags & (RVT_S_BUSY | HFI1_S_ANY_WAIT_IO)))) {
+ struct iowait_work *iowork;
+
+ iowork = iowait_get_ib_work(&priv->s_iowait);
+ ps->s_txreq = get_waiting_verbs_txreq(iowork);
+ if (ps->s_txreq || hfi1_make_rc_req(qp, ps)) {
+ priv->s_flags |= HFI1_S_TID_BUSY_SET;
+ return 1;
+ }
+ }
+
+ ps->s_txreq = get_txreq(ps->dev, qp);
+ if (!ps->s_txreq)
+ goto bail_no_tx;
+
+ ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth;
+
+ if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_SEND_OK)) {
+ if (!(ib_rvt_state_ops[qp->state] & RVT_FLUSH_SEND))
+ goto bail;
+ /* We are in the error state, flush the work request. */
+ if (qp->s_last == READ_ONCE(qp->s_head))
+ goto bail;
+ /* If DMAs are in progress, we can't flush immediately. */
+ if (iowait_sdma_pending(&priv->s_iowait)) {
+ qp->s_flags |= RVT_S_WAIT_DMA;
+ goto bail;
+ }
+ clear_ahg(qp);
+ wqe = rvt_get_swqe_ptr(qp, qp->s_last);
+ hfi1_trdma_send_complete(qp, wqe, qp->s_last != qp->s_acked ?
+ IB_WC_SUCCESS : IB_WC_WR_FLUSH_ERR);
+ /* will get called again */
+ goto done_free_tx;
+ }
+
+ if (priv->s_flags & RVT_S_WAIT_ACK)
+ goto bail;
+
+ /* Check whether there is anything to do. */
+ if (priv->s_tid_tail == HFI1_QP_WQE_INVALID)
+ goto bail;
+ wqe = rvt_get_swqe_ptr(qp, priv->s_tid_tail);
+ req = wqe_to_tid_req(wqe);
+ switch (priv->s_state) {
+ case TID_OP(WRITE_REQ):
+ case TID_OP(WRITE_RESP):
+ priv->tid_ss.sge = wqe->sg_list[0];
+ priv->tid_ss.sg_list = wqe->sg_list + 1;
+ priv->tid_ss.num_sge = wqe->wr.num_sge;
+ priv->tid_ss.total_len = wqe->length;
+
+ if (priv->s_state == TID_OP(WRITE_REQ))
+ hfi1_tid_rdma_restart_req(qp, wqe, &bth2);
+ priv->s_state = TID_OP(WRITE_DATA);
+ /* fall through */
+
+ case TID_OP(WRITE_DATA):
+ /*
+ * 1. Check whether TID RDMA WRITE RESP available.
+ * 2. If no:
+ * 2.1 If have more segments and no TID RDMA WRITE RESP,
+ * set HFI1_S_WAIT_TID_RESP
+ * 2.2 Return indicating no progress made.
+ * 3. If yes:
+ * 3.1 Build TID RDMA WRITE DATA packet.
+ * 3.2 If last packet in segment:
+ * 3.2.1 Change KDETH header bits
+ * 3.2.2 Advance RESP pointers.
+ * 3.3 Return indicating progress made.
+ */
+ wqe = rvt_get_swqe_ptr(qp, priv->s_tid_tail);
+ req = wqe_to_tid_req(wqe);
+ len = wqe->length;
+
+ if (!req->comp_seg || req->cur_seg == req->comp_seg)
+ goto bail;
+
+ last = hfi1_build_tid_rdma_packet(wqe, ohdr, &bth1, &bth2,
+ &len);
+
+ if (last) {
+ /* move pointer to next flow */
+ req->clear_tail = CIRC_NEXT(req->clear_tail,
+ MAX_FLOWS);
+ if (++req->cur_seg < req->total_segs) {
+ if (!CIRC_CNT(req->setup_head, req->clear_tail,
+ MAX_FLOWS))
+ qp->s_flags |= HFI1_S_WAIT_TID_RESP;
+ } else {
+ priv->s_state = TID_OP(WRITE_DATA_LAST);
+ opcode = TID_OP(WRITE_DATA_LAST);
+
+ /* Advance the s_tid_tail now */
+ update_tid_tail(qp);
+ }
+ }
+ hwords += sizeof(ohdr->u.tid_rdma.w_data) / sizeof(u32);
+ ss = &priv->tid_ss;
+ break;
+
+ case TID_OP(RESYNC):
+ /* Use generation from the most recently received response */
+ wqe = rvt_get_swqe_ptr(qp, priv->s_tid_cur);
+ req = wqe_to_tid_req(wqe);
+ /* If no responses for this WQE look at the previous one */
+ if (!req->comp_seg) {
+ wqe = rvt_get_swqe_ptr(qp,
+ (!priv->s_tid_cur ? qp->s_size :
+ priv->s_tid_cur) - 1);
+ req = wqe_to_tid_req(wqe);
+ }
+ hwords += hfi1_build_tid_rdma_resync(qp, wqe, ohdr, &bth1,
+ &bth2,
+ CIRC_PREV(req->setup_head,
+ MAX_FLOWS));
+ ss = NULL;
+ len = 0;
+ opcode = TID_OP(RESYNC);
+ break;
+
+ default:
+ goto bail;
+ }
+ if (priv->s_flags & RVT_S_SEND_ONE) {
+ priv->s_flags &= ~RVT_S_SEND_ONE;
+ priv->s_flags |= RVT_S_WAIT_ACK;
+ bth2 |= IB_BTH_REQ_ACK;
+ }
+ qp->s_len -= len;
+ ps->s_txreq->hdr_dwords = hwords;
+ ps->s_txreq->sde = priv->s_sde;
+ ps->s_txreq->ss = ss;
+ ps->s_txreq->s_cur_size = len;
+ hfi1_make_ruc_header(qp, ohdr, (opcode << 24), bth1, bth2,
+ middle, ps);
+ return 1;
+done_free_tx:
+ hfi1_put_txreq(ps->s_txreq);
+ ps->s_txreq = NULL;
+ return 1;
+
+bail:
+ hfi1_put_txreq(ps->s_txreq);
+bail_no_tx:
+ ps->s_txreq = NULL;
+ priv->s_flags &= ~RVT_S_BUSY;
+ /*
+ * If we didn't get a txreq, the QP will be woken up later to try
+ * again, set the flags to the the wake up which work item to wake
+ * up.
+ * (A better algorithm should be found to do this and generalize the
+ * sleep/wakeup flags.)
+ */
+ iowait_set_flag(&priv->s_iowait, IOWAIT_PENDING_TID);
+ return 0;
+}