for (i = qp->r_head_ack_queue; ; i = p) { if (i == qp->s_tail_ack_queue)
s = false; if (i)
p = i - 1; else
p = rvt_size_atomic(ib_to_rvt(qp->ibqp.device)); if (p == qp->r_head_ack_queue) {
e = NULL; break;
}
e = &qp->s_ack_queue[p]; if (!e->opcode) {
e = NULL; break;
} if (cmp_psn(psn, e->psn) >= 0) { if (p == qp->s_tail_ack_queue &&
cmp_psn(psn, e->lpsn) <= 0)
s = false; break;
}
} if (prev)
*prev = p; if (prev_ack)
*prev_ack = i; if (scheduled)
*scheduled = s; return e;
}
/** * make_rc_ack - construct a response packet (ACK, NAK, or RDMA read) * @dev: the device for this QP * @qp: a pointer to the QP * @ohdr: a pointer to the IB header being constructed * @ps: the xmit packet state * * Return 1 if constructed; otherwise, return 0. * Note that we are in the responder's side of the QP context. * Note the QP s_lock must be held.
*/ staticint make_rc_ack(struct hfi1_ibdev *dev, struct rvt_qp *qp, struct ib_other_headers *ohdr, struct hfi1_pkt_state *ps)
{ struct rvt_ack_entry *e;
u32 hwords, hdrlen;
u32 len = 0;
u32 bth0 = 0, bth2 = 0;
u32 bth1 = qp->remote_qpn | (HFI1_CAP_IS_KSET(OPFN) << IB_BTHE_E_SHIFT); int middle = 0;
u32 pmtu = qp->pmtu; struct hfi1_qp_priv *qpriv = qp->priv; bool last_pkt;
u32 delta;
u8 next = qp->s_tail_ack_queue; struct tid_rdma_request *req;
trace_hfi1_rsp_make_rc_ack(qp, 0);
lockdep_assert_held(&qp->s_lock); /* Don't send an ACK if we aren't supposed to. */ if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) goto bail;
if (qpriv->hdr_type == HFI1_PKT_TYPE_9B) /* header size in 32-bit words LRH+BTH = (8+12)/4. */
hwords = 5; else /* header size in 32-bit words 16B LRH+BTH = (16+12)/4. */
hwords = 7;
switch (qp->s_ack_state) { case OP(RDMA_READ_RESPONSE_LAST): case OP(RDMA_READ_RESPONSE_ONLY):
e = &qp->s_ack_queue[qp->s_tail_ack_queue];
release_rdma_sge_mr(e);
fallthrough; case OP(ATOMIC_ACKNOWLEDGE): /* * We can increment the tail pointer now that the last * response has been sent instead of only being * constructed.
*/ if (++next > rvt_size_atomic(&dev->rdi))
next = 0; /* * Only advance the s_acked_ack_queue pointer if there * have been no TID RDMA requests.
*/
e = &qp->s_ack_queue[qp->s_tail_ack_queue]; if (e->opcode != TID_OP(WRITE_REQ) &&
qp->s_acked_ack_queue == qp->s_tail_ack_queue)
qp->s_acked_ack_queue = next;
qp->s_tail_ack_queue = next;
trace_hfi1_rsp_make_rc_ack(qp, e->psn);
fallthrough; case OP(SEND_ONLY): case OP(ACKNOWLEDGE): /* Check for no next entry in the queue. */ if (qp->r_head_ack_queue == qp->s_tail_ack_queue) { if (qp->s_flags & RVT_S_ACK_PENDING) goto normal; goto bail;
}
e = &qp->s_ack_queue[qp->s_tail_ack_queue]; /* Check for tid write fence */ if ((qpriv->s_flags & HFI1_R_TID_WAIT_INTERLCK) ||
hfi1_tid_rdma_ack_interlock(qp, e)) {
iowait_set_flag(&qpriv->s_iowait, IOWAIT_PENDING_IB); goto bail;
} if (e->opcode == OP(RDMA_READ_REQUEST)) { /* * If a RDMA read response is being resent and * we haven't seen the duplicate request yet, * then stop sending the remaining responses the * responder has seen until the requester re-sends it.
*/
len = e->rdma_sge.sge_length; if (len && !e->rdma_sge.mr) { if (qp->s_acked_ack_queue ==
qp->s_tail_ack_queue)
qp->s_acked_ack_queue =
qp->r_head_ack_queue;
qp->s_tail_ack_queue = qp->r_head_ack_queue; goto bail;
} /* Copy SGE state in case we need to resend */
ps->s_txreq->mr = e->rdma_sge.mr; if (ps->s_txreq->mr)
rvt_get_mr(ps->s_txreq->mr);
qp->s_ack_rdma_sge.sge = e->rdma_sge;
qp->s_ack_rdma_sge.num_sge = 1;
ps->s_txreq->ss = &qp->s_ack_rdma_sge; if (len > pmtu) {
len = pmtu;
qp->s_ack_state = OP(RDMA_READ_RESPONSE_FIRST);
} else {
qp->s_ack_state = OP(RDMA_READ_RESPONSE_ONLY);
e->sent = 1;
}
ohdr->u.aeth = rvt_compute_aeth(qp);
hwords++;
qp->s_ack_rdma_psn = e->psn;
bth2 = mask_psn(qp->s_ack_rdma_psn++);
} elseif (e->opcode == TID_OP(WRITE_REQ)) { /* * If a TID RDMA WRITE RESP is being resent, we have to * wait for the actual request. All requests that are to * be resent will have their state set to * TID_REQUEST_RESEND. When the new request arrives, the * state will be changed to TID_REQUEST_RESEND_ACTIVE.
*/
req = ack_to_tid_req(e); if (req->state == TID_REQUEST_RESEND ||
req->state == TID_REQUEST_INIT_RESEND) goto bail;
qp->s_ack_state = TID_OP(WRITE_RESP);
qp->s_ack_rdma_psn = mask_psn(e->psn + req->cur_seg); goto write_resp;
} elseif (e->opcode == TID_OP(READ_REQ)) { /* * If a TID RDMA read response is being resent and * we haven't seen the duplicate request yet, * then stop sending the remaining responses the * responder has seen until the requester re-sends it.
*/
len = e->rdma_sge.sge_length; if (len && !e->rdma_sge.mr) { if (qp->s_acked_ack_queue ==
qp->s_tail_ack_queue)
qp->s_acked_ack_queue =
qp->r_head_ack_queue;
qp->s_tail_ack_queue = qp->r_head_ack_queue; goto bail;
} /* Copy SGE state in case we need to resend */
ps->s_txreq->mr = e->rdma_sge.mr; if (ps->s_txreq->mr)
rvt_get_mr(ps->s_txreq->mr);
qp->s_ack_rdma_sge.sge = e->rdma_sge;
qp->s_ack_rdma_sge.num_sge = 1;
qp->s_ack_state = TID_OP(READ_RESP); goto read_resp;
} else { /* COMPARE_SWAP or FETCH_ADD */
ps->s_txreq->ss = NULL;
len = 0;
qp->s_ack_state = OP(ATOMIC_ACKNOWLEDGE);
ohdr->u.at.aeth = rvt_compute_aeth(qp);
ib_u64_put(e->atomic_data, &ohdr->u.at.atomic_ack_eth);
hwords += sizeof(ohdr->u.at) / sizeof(u32);
bth2 = mask_psn(e->psn);
e->sent = 1;
}
trace_hfi1_tid_write_rsp_make_rc_ack(qp);
bth0 = qp->s_ack_state << 24; break;
case OP(RDMA_READ_RESPONSE_FIRST):
qp->s_ack_state = OP(RDMA_READ_RESPONSE_MIDDLE);
fallthrough; case OP(RDMA_READ_RESPONSE_MIDDLE):
ps->s_txreq->ss = &qp->s_ack_rdma_sge;
ps->s_txreq->mr = qp->s_ack_rdma_sge.sge.mr; if (ps->s_txreq->mr)
rvt_get_mr(ps->s_txreq->mr);
len = qp->s_ack_rdma_sge.sge.sge_length; if (len > pmtu) {
len = pmtu;
middle = HFI1_CAP_IS_KSET(SDMA_AHG);
} else {
ohdr->u.aeth = rvt_compute_aeth(qp);
hwords++;
qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST);
e = &qp->s_ack_queue[qp->s_tail_ack_queue];
e->sent = 1;
}
bth0 = qp->s_ack_state << 24;
bth2 = mask_psn(qp->s_ack_rdma_psn++); break;
case TID_OP(WRITE_RESP):
write_resp: /* * 1. Check if RVT_S_ACK_PENDING is set. If yes, * goto normal. * 2. Attempt to allocate TID resources. * 3. Remove RVT_S_RESP_PENDING flags from s_flags * 4. If resources not available: * 4.1 Set RVT_S_WAIT_TID_SPACE * 4.2 Queue QP on RCD TID queue * 4.3 Put QP on iowait list. * 4.4 Build IB RNR NAK with appropriate timeout value * 4.5 Return indication progress made. * 5. If resources are available: * 5.1 Program HW flow CSRs * 5.2 Build TID RDMA WRITE RESP packet * 5.3 If more resources needed, do 2.1 - 2.3. * 5.4 Wake up next QP on RCD TID queue. * 5.5 Return indication progress made.
*/
e = &qp->s_ack_queue[qp->s_tail_ack_queue];
req = ack_to_tid_req(e);
/* * Send scheduled RNR NAK's. RNR NAK's need to be sent at * segment boundaries, not at request boundaries. Don't change * s_ack_state because we are still in the middle of a request
*/ if (qpriv->rnr_nak_state == TID_RNR_NAK_SEND &&
qp->s_tail_ack_queue == qpriv->r_tid_alloc &&
req->cur_seg == req->alloc_seg) {
qpriv->rnr_nak_state = TID_RNR_NAK_SENT; goto normal_no_state;
}
bth2 = mask_psn(qp->s_ack_rdma_psn);
hdrlen = hfi1_build_tid_rdma_write_resp(qp, e, ohdr, &bth1,
bth2, &len,
&ps->s_txreq->ss); if (!hdrlen) return 0;
e->sent = 1; /* Do not free e->rdma_sge until all data are received */
qp->s_ack_state = OP(ATOMIC_ACKNOWLEDGE); break;
case TID_OP(READ_RESP):
read_resp:
e = &qp->s_ack_queue[qp->s_tail_ack_queue];
ps->s_txreq->ss = &qp->s_ack_rdma_sge;
delta = hfi1_build_tid_rdma_read_resp(qp, e, ohdr, &bth0,
&bth1, &bth2, &len,
&last_pkt); if (delta == 0) goto error_qp;
hwords += delta; if (last_pkt) {
e->sent = 1; /* * Increment qp->s_tail_ack_queue through s_ack_state * transition.
*/
qp->s_ack_state = OP(RDMA_READ_RESPONSE_LAST);
} break; case TID_OP(READ_REQ): goto bail;
default:
normal: /* * Send a regular ACK. * Set the s_ack_state so we wait until after sending * the ACK before setting s_ack_state to ACKNOWLEDGE * (see above).
*/
qp->s_ack_state = OP(SEND_ONLY);
normal_no_state: if (qp->s_nak_state)
ohdr->u.aeth =
cpu_to_be32((qp->r_msn & IB_MSN_MASK) |
(qp->s_nak_state <<
IB_AETH_CREDIT_SHIFT)); else
ohdr->u.aeth = rvt_compute_aeth(qp);
hwords++;
len = 0;
bth0 = OP(ACKNOWLEDGE) << 24;
bth2 = mask_psn(qp->s_ack_psn);
qp->s_flags &= ~RVT_S_ACK_PENDING;
ps->s_txreq->txreq.flags |= SDMA_TXREQ_F_VIP;
ps->s_txreq->ss = NULL;
}
qp->s_rdma_ack_cnt++;
ps->s_txreq->sde = qpriv->s_sde;
ps->s_txreq->s_cur_size = len;
ps->s_txreq->hdr_dwords = hwords;
hfi1_make_ruc_header(qp, ohdr, bth0, bth1, bth2, middle, ps); return 1;
error_qp:
spin_unlock_irqrestore(&qp->s_lock, ps->flags);
spin_lock_irqsave(&qp->r_lock, ps->flags);
spin_lock(&qp->s_lock);
rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR);
spin_unlock(&qp->s_lock);
spin_unlock_irqrestore(&qp->r_lock, ps->flags);
spin_lock_irqsave(&qp->s_lock, ps->flags);
bail:
qp->s_ack_state = OP(ACKNOWLEDGE); /* * Ensure s_rdma_ack_cnt changes are committed prior to resetting * RVT_S_RESP_PENDING
*/
smp_wmb();
qp->s_flags &= ~(RVT_S_RESP_PENDING
| RVT_S_ACK_PENDING
| HFI1_S_AHG_VALID); return 0;
}
/** * hfi1_make_rc_req - construct a request packet (SEND, RDMA r/w, ATOMIC) * @qp: a pointer to the QP * @ps: the current packet state * * Assumes s_lock is held. * * Return 1 if constructed; otherwise, return 0.
*/ int hfi1_make_rc_req(struct rvt_qp *qp, struct hfi1_pkt_state *ps)
{ struct hfi1_qp_priv *priv = qp->priv; struct hfi1_ibdev *dev = to_idev(qp->ibqp.device); struct ib_other_headers *ohdr; struct rvt_sge_state *ss = NULL; struct rvt_swqe *wqe; struct hfi1_swqe_priv *wpriv; struct tid_rdma_request *req = NULL; /* header size in 32-bit words LRH+BTH = (8+12)/4. */
u32 hwords = 5;
u32 len = 0;
u32 bth0 = 0, bth2 = 0;
u32 bth1 = qp->remote_qpn | (HFI1_CAP_IS_KSET(OPFN) << IB_BTHE_E_SHIFT);
u32 pmtu = qp->pmtu; char newreq; int middle = 0; int delta; struct tid_rdma_flow *flow = NULL; struct tid_rdma_params *remote;
trace_hfi1_sender_make_rc_req(qp);
lockdep_assert_held(&qp->s_lock);
ps->s_txreq = get_txreq(ps->dev, qp); if (!ps->s_txreq) goto bail_no_tx;
if (priv->hdr_type == HFI1_PKT_TYPE_9B) { /* header size in 32-bit words LRH+BTH = (8+12)/4. */
hwords = 5; if (rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH)
ohdr = &ps->s_txreq->phdr.hdr.ibh.u.l.oth; else
ohdr = &ps->s_txreq->phdr.hdr.ibh.u.oth;
} else { /* header size in 32-bit words 16B LRH+BTH = (16+12)/4. */
hwords = 7; if ((rdma_ah_get_ah_flags(&qp->remote_ah_attr) & IB_AH_GRH) &&
(hfi1_check_mcast(rdma_ah_get_dlid(&qp->remote_ah_attr))))
ohdr = &ps->s_txreq->phdr.hdr.opah.u.l.oth; else
ohdr = &ps->s_txreq->phdr.hdr.opah.u.oth;
}
/* Sending responses has higher priority over sending requests. */ if ((qp->s_flags & RVT_S_RESP_PENDING) &&
make_rc_ack(dev, qp, ohdr, ps)) return 1;
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 (qp->s_flags & (RVT_S_WAIT_RNR | RVT_S_WAIT_ACK | HFI1_S_WAIT_HALT)) goto bail;
/* Send a request. */
wqe = rvt_get_swqe_ptr(qp, qp->s_cur);
check_s_state: switch (qp->s_state) { default: if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_NEXT_SEND_OK)) goto bail; /* * Resend an old request or start a new one. * * We keep track of the current SWQE so that * we don't reset the "furthest progress" state * if we need to back up.
*/
newreq = 0; if (qp->s_cur == qp->s_tail) { /* Check if send work queue is empty. */ if (qp->s_tail == READ_ONCE(qp->s_head)) {
clear_ahg(qp); goto bail;
} /* * If a fence is requested, wait for previous * RDMA read and atomic operations to finish. * However, there is no need to guard against * TID RDMA READ after TID RDMA READ.
*/ if ((wqe->wr.send_flags & IB_SEND_FENCE) &&
qp->s_num_rd_atomic &&
(wqe->wr.opcode != IB_WR_TID_RDMA_READ ||
priv->pending_tid_r_segs < qp->s_num_rd_atomic)) {
qp->s_flags |= RVT_S_WAIT_FENCE; goto bail;
} /* * Local operations are processed immediately * after all prior requests have completed
*/ if (wqe->wr.opcode == IB_WR_REG_MR ||
wqe->wr.opcode == IB_WR_LOCAL_INV) { int local_ops = 0; int err = 0;
if (qp->s_last != qp->s_cur) goto bail; if (++qp->s_cur == qp->s_size)
qp->s_cur = 0; if (++qp->s_tail == qp->s_size)
qp->s_tail = 0; if (!(wqe->wr.send_flags &
RVT_SEND_COMPLETION_ONLY)) {
err = rvt_invalidate_rkey(
qp,
wqe->wr.ex.invalidate_rkey);
local_ops = 1;
}
rvt_send_complete(qp, wqe,
err ? IB_WC_LOC_PROT_ERR
: IB_WC_SUCCESS); if (local_ops)
atomic_dec(&qp->local_ops_pending); goto done_free_tx;
}
newreq = 1;
qp->s_psn = wqe->psn;
} /* * Note that we have to be careful not to modify the * original work request since we may need to resend * it.
*/
len = wqe->length;
ss = &qp->s_sge;
bth2 = mask_psn(qp->s_psn);
/* * Interlock between various IB requests and TID RDMA * if necessary.
*/ if ((priv->s_flags & HFI1_S_TID_WAIT_INTERLCK) ||
hfi1_tid_rdma_wqe_interlock(qp, wqe)) goto bail;
switch (wqe->wr.opcode) { case IB_WR_SEND: case IB_WR_SEND_WITH_IMM: case IB_WR_SEND_WITH_INV: /* If no credit, return. */ if (!rvt_rc_credit_avail(qp, wqe)) goto bail; if (len > pmtu) {
qp->s_state = OP(SEND_FIRST);
len = pmtu; break;
} if (wqe->wr.opcode == IB_WR_SEND) {
qp->s_state = OP(SEND_ONLY);
} elseif (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
qp->s_state = OP(SEND_ONLY_WITH_IMMEDIATE); /* Immediate data comes after the BTH */
ohdr->u.imm_data = wqe->wr.ex.imm_data;
hwords += 1;
} else {
qp->s_state = OP(SEND_ONLY_WITH_INVALIDATE); /* Invalidate rkey comes after the BTH */
ohdr->u.ieth = cpu_to_be32(
wqe->wr.ex.invalidate_rkey);
hwords += 1;
} if (wqe->wr.send_flags & IB_SEND_SOLICITED)
bth0 |= IB_BTH_SOLICITED;
bth2 |= IB_BTH_REQ_ACK; if (++qp->s_cur == qp->s_size)
qp->s_cur = 0; break;
case IB_WR_RDMA_WRITE: if (newreq && !(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
qp->s_lsn++; goto no_flow_control; case IB_WR_RDMA_WRITE_WITH_IMM: /* If no credit, return. */ if (!rvt_rc_credit_avail(qp, wqe)) goto bail;
no_flow_control:
put_ib_reth_vaddr(
wqe->rdma_wr.remote_addr,
&ohdr->u.rc.reth);
ohdr->u.rc.reth.rkey =
cpu_to_be32(wqe->rdma_wr.rkey);
ohdr->u.rc.reth.length = cpu_to_be32(len);
hwords += sizeof(struct ib_reth) / sizeof(u32); if (len > pmtu) {
qp->s_state = OP(RDMA_WRITE_FIRST);
len = pmtu; break;
} if (wqe->wr.opcode == IB_WR_RDMA_WRITE) {
qp->s_state = OP(RDMA_WRITE_ONLY);
} else {
qp->s_state =
OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE); /* Immediate data comes after RETH */
ohdr->u.rc.imm_data = wqe->wr.ex.imm_data;
hwords += 1; if (wqe->wr.send_flags & IB_SEND_SOLICITED)
bth0 |= IB_BTH_SOLICITED;
}
bth2 |= IB_BTH_REQ_ACK; if (++qp->s_cur == qp->s_size)
qp->s_cur = 0; break;
case IB_WR_TID_RDMA_WRITE: if (newreq) { /* * Limit the number of TID RDMA WRITE requests.
*/ if (atomic_read(&priv->n_tid_requests) >=
HFI1_TID_RDMA_WRITE_CNT) goto bail;
if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
qp->s_lsn++;
}
/* * The s_tid_cur pointer is advanced to s_cur if * any of the following conditions about the WQE * to which s_ti_cur currently points to are * satisfied: * 1. The request is not a TID RDMA WRITE * request, * 2. The request is in the INACTIVE or * COMPLETE states (TID RDMA READ requests * stay at INACTIVE and TID RDMA WRITE * transition to COMPLETE when done), * 3. The request is in the ACTIVE or SYNC * state and the number of completed * segments is equal to the total segment * count. * (If ACTIVE, the request is waiting for * ACKs. If SYNC, the request has not * received any responses because it's * waiting on a sync point.)
*/ if (__w->wr.opcode != IB_WR_TID_RDMA_WRITE ||
__r->state == TID_REQUEST_INACTIVE ||
__r->state == TID_REQUEST_COMPLETE ||
((__r->state == TID_REQUEST_ACTIVE ||
__r->state == TID_REQUEST_SYNC) &&
__r->comp_seg == __r->total_segs)) { if (priv->s_tid_tail ==
priv->s_tid_cur &&
priv->s_state ==
TID_OP(WRITE_DATA_LAST)) {
priv->s_tid_tail = qp->s_cur;
priv->s_state =
TID_OP(WRITE_RESP);
}
priv->s_tid_cur = qp->s_cur;
} /* * A corner case: when the last TID RDMA WRITE * request was completed, s_tid_head, * s_tid_cur, and s_tid_tail all point to the * same location. Other requests are posted and * s_cur wraps around to the same location, * where a new TID RDMA WRITE is posted. In * this case, none of the indices need to be * updated. However, the priv->s_state should.
*/ if (priv->s_tid_tail == qp->s_cur &&
priv->s_state == TID_OP(WRITE_DATA_LAST))
priv->s_state = TID_OP(WRITE_RESP);
}
req = wqe_to_tid_req(wqe); if (newreq) {
priv->s_tid_head = qp->s_cur;
priv->pending_tid_w_resp += req->total_segs;
atomic_inc(&priv->n_tid_requests);
atomic_dec(&priv->n_requests);
} else {
req->state = TID_REQUEST_RESEND;
req->comp_seg = delta_psn(bth2, wqe->psn); /* * Pull back any segments since we are going * to re-receive them.
*/
req->setup_head = req->clear_tail;
priv->pending_tid_w_resp +=
delta_psn(wqe->lpsn, bth2) + 1;
}
/* * Don't allow more operations to be started * than the QP limits allow. We could get here under * three conditions; (1) It's a new request; (2) We are * sending the second or later segment of a request, * but the qp->s_state is set to OP(RDMA_READ_REQUEST) * when the last segment of a previous request is * received just before this; (3) We are re-sending a * request.
*/ if (qp->s_num_rd_atomic >= qp->s_max_rd_atomic) {
qp->s_flags |= RVT_S_WAIT_RDMAR; goto bail;
} if (newreq) { struct tid_rdma_flow *flow =
&req->flows[req->setup_head];
/* * Set up s_sge as it is needed for TID * allocation. However, if the pages have been * walked and mapped, skip it. An earlier try * has failed to allocate the TID entries.
*/ if (!flow->npagesets) {
qp->s_sge.sge = wqe->sg_list[0];
qp->s_sge.sg_list = wqe->sg_list + 1;
qp->s_sge.num_sge = wqe->wr.num_sge;
qp->s_sge.total_len = wqe->length;
qp->s_len = wqe->length;
req->isge = 0;
req->clear_tail = req->setup_head;
req->flow_idx = req->setup_head;
req->state = TID_REQUEST_ACTIVE;
}
} elseif (delta == 0) { /* Re-send a request */
req->cur_seg = 0;
req->comp_seg = 0;
req->ack_pending = 0;
req->flow_idx = req->clear_tail;
req->state = TID_REQUEST_RESEND;
}
req->s_next_psn = qp->s_psn; /* Read one segment at a time */
len = min_t(u32, req->seg_len,
wqe->length - req->seg_len * req->cur_seg);
delta = hfi1_build_tid_rdma_read_req(qp, wqe, ohdr,
&bth1, &bth2,
&len); if (delta <= 0) { /* Wait for TID space */ goto bail;
} if (newreq && !(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
qp->s_lsn++;
hwords += delta;
ss = &wpriv->ss; /* Check if this is the last segment */ if (req->cur_seg >= req->total_segs &&
++qp->s_cur == qp->s_size)
qp->s_cur = 0; break;
case IB_WR_ATOMIC_CMP_AND_SWP: case IB_WR_ATOMIC_FETCH_AND_ADD: /* * Don't allow more operations to be started * than the QP limits allow.
*/ if (qp->s_num_rd_atomic >=
qp->s_max_rd_atomic) {
qp->s_flags |= RVT_S_WAIT_RDMAR; goto bail;
}
qp->s_num_rd_atomic++;
fallthrough; case IB_WR_OPFN: if (newreq && !(qp->s_flags & RVT_S_UNLIMITED_CREDIT))
qp->s_lsn++; if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
wqe->wr.opcode == IB_WR_OPFN) {
qp->s_state = OP(COMPARE_SWAP);
put_ib_ateth_swap(wqe->atomic_wr.swap,
&ohdr->u.atomic_eth);
put_ib_ateth_compare(wqe->atomic_wr.compare_add,
&ohdr->u.atomic_eth);
} else {
qp->s_state = OP(FETCH_ADD);
put_ib_ateth_swap(wqe->atomic_wr.compare_add,
&ohdr->u.atomic_eth);
put_ib_ateth_compare(0, &ohdr->u.atomic_eth);
}
put_ib_ateth_vaddr(wqe->atomic_wr.remote_addr,
&ohdr->u.atomic_eth);
ohdr->u.atomic_eth.rkey = cpu_to_be32(
wqe->atomic_wr.rkey);
hwords += sizeof(struct ib_atomic_eth) / sizeof(u32);
ss = NULL;
len = 0;
bth2 |= IB_BTH_REQ_ACK; if (++qp->s_cur == qp->s_size)
qp->s_cur = 0; break;
case OP(RDMA_READ_RESPONSE_FIRST): /* * qp->s_state is normally set to the opcode of the * last packet constructed for new requests and therefore * is never set to RDMA read response. * RDMA_READ_RESPONSE_FIRST is used by the ACK processing * thread to indicate a SEND needs to be restarted from an * earlier PSN without interfering with the sending thread. * See restart_rc().
*/
qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu);
fallthrough; case OP(SEND_FIRST):
qp->s_state = OP(SEND_MIDDLE);
fallthrough; case OP(SEND_MIDDLE):
bth2 = mask_psn(qp->s_psn++);
ss = &qp->s_sge;
len = qp->s_len; if (len > pmtu) {
len = pmtu;
middle = HFI1_CAP_IS_KSET(SDMA_AHG); break;
} if (wqe->wr.opcode == IB_WR_SEND) {
qp->s_state = OP(SEND_LAST);
} elseif (wqe->wr.opcode == IB_WR_SEND_WITH_IMM) {
qp->s_state = OP(SEND_LAST_WITH_IMMEDIATE); /* Immediate data comes after the BTH */
ohdr->u.imm_data = wqe->wr.ex.imm_data;
hwords += 1;
} else {
qp->s_state = OP(SEND_LAST_WITH_INVALIDATE); /* invalidate data comes after the BTH */
ohdr->u.ieth = cpu_to_be32(wqe->wr.ex.invalidate_rkey);
hwords += 1;
} if (wqe->wr.send_flags & IB_SEND_SOLICITED)
bth0 |= IB_BTH_SOLICITED;
bth2 |= IB_BTH_REQ_ACK;
qp->s_cur++; if (qp->s_cur >= qp->s_size)
qp->s_cur = 0; break;
case OP(RDMA_READ_RESPONSE_LAST): /* * qp->s_state is normally set to the opcode of the * last packet constructed for new requests and therefore * is never set to RDMA read response. * RDMA_READ_RESPONSE_LAST is used by the ACK processing * thread to indicate a RDMA write needs to be restarted from * an earlier PSN without interfering with the sending thread. * See restart_rc().
*/
qp->s_len = restart_sge(&qp->s_sge, wqe, qp->s_psn, pmtu);
fallthrough; case OP(RDMA_WRITE_FIRST):
qp->s_state = OP(RDMA_WRITE_MIDDLE);
fallthrough; case OP(RDMA_WRITE_MIDDLE):
bth2 = mask_psn(qp->s_psn++);
ss = &qp->s_sge;
len = qp->s_len; if (len > pmtu) {
len = pmtu;
middle = HFI1_CAP_IS_KSET(SDMA_AHG); break;
} if (wqe->wr.opcode == IB_WR_RDMA_WRITE) {
qp->s_state = OP(RDMA_WRITE_LAST);
} else {
qp->s_state = OP(RDMA_WRITE_LAST_WITH_IMMEDIATE); /* Immediate data comes after the BTH */
ohdr->u.imm_data = wqe->wr.ex.imm_data;
hwords += 1; if (wqe->wr.send_flags & IB_SEND_SOLICITED)
bth0 |= IB_BTH_SOLICITED;
}
bth2 |= IB_BTH_REQ_ACK;
qp->s_cur++; if (qp->s_cur >= qp->s_size)
qp->s_cur = 0; break;
case OP(RDMA_READ_RESPONSE_MIDDLE): /* * qp->s_state is normally set to the opcode of the * last packet constructed for new requests and therefore * is never set to RDMA read response. * RDMA_READ_RESPONSE_MIDDLE is used by the ACK processing * thread to indicate a RDMA read needs to be restarted from * an earlier PSN without interfering with the sending thread. * See restart_rc().
*/
len = (delta_psn(qp->s_psn, wqe->psn)) * pmtu;
put_ib_reth_vaddr(
wqe->rdma_wr.remote_addr + len,
&ohdr->u.rc.reth);
ohdr->u.rc.reth.rkey =
cpu_to_be32(wqe->rdma_wr.rkey);
ohdr->u.rc.reth.length = cpu_to_be32(wqe->length - len);
qp->s_state = OP(RDMA_READ_REQUEST);
hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32);
bth2 = mask_psn(qp->s_psn) | IB_BTH_REQ_ACK;
qp->s_psn = wqe->lpsn + 1;
ss = NULL;
len = 0;
qp->s_cur++; if (qp->s_cur == qp->s_size)
qp->s_cur = 0; break;
case TID_OP(WRITE_RESP): /* * This value for s_state is used for restarting a TID RDMA * WRITE request. See comment in OP(RDMA_READ_RESPONSE_MIDDLE * for more).
*/
req = wqe_to_tid_req(wqe);
req->state = TID_REQUEST_RESEND;
rcu_read_lock();
remote = rcu_dereference(priv->tid_rdma.remote);
req->comp_seg = delta_psn(qp->s_psn, wqe->psn);
len = wqe->length - (req->comp_seg * remote->max_len);
rcu_read_unlock();
case TID_OP(READ_RESP): if (wqe->wr.opcode != IB_WR_TID_RDMA_READ) goto bail; /* This is used to restart a TID read request */
req = wqe_to_tid_req(wqe);
wpriv = wqe->priv; /* * Back down. The field qp->s_psn has been set to the psn with * which the request should be restart. It's OK to use division * as this is on the retry path.
*/
req->cur_seg = delta_psn(qp->s_psn, wqe->psn) / priv->pkts_ps;
/* * The following function need to be redefined to return the * status to make sure that we find the flow. At the same * time, we can use the req->state change to check if the * call succeeds or not.
*/
req->state = TID_REQUEST_RESEND;
hfi1_tid_rdma_restart_req(qp, wqe, &bth2); if (req->state != TID_REQUEST_ACTIVE) { /* * Failed to find the flow. Release all allocated tid * resources.
*/
hfi1_kern_exp_rcv_clear_all(req);
hfi1_kern_clear_hw_flow(priv->rcd, qp);
hfi1_trdma_send_complete(qp, wqe, IB_WC_LOC_QP_OP_ERR); goto bail;
}
req->state = TID_REQUEST_RESEND;
len = min_t(u32, req->seg_len,
wqe->length - req->seg_len * req->cur_seg);
flow = &req->flows[req->flow_idx];
len -= flow->sent;
req->s_next_psn = flow->flow_state.ib_lpsn + 1;
delta = hfi1_build_tid_rdma_read_packet(wqe, ohdr, &bth1,
&bth2, &len); if (delta <= 0) { /* Wait for TID space */ goto bail;
}
hwords += delta;
ss = &wpriv->ss; /* Check if this is the last segment */ if (req->cur_seg >= req->total_segs &&
++qp->s_cur == qp->s_size)
qp->s_cur = 0;
qp->s_psn = req->s_next_psn;
trace_hfi1_tid_req_make_req_read(qp, 0, wqe->wr.opcode,
wqe->psn, wqe->lpsn, req); break; case TID_OP(READ_REQ):
req = wqe_to_tid_req(wqe);
delta = cmp_psn(qp->s_psn, wqe->psn); /* * If the current WR is not TID RDMA READ, or this is the start * of a new request, we need to change the qp->s_state so that * the request can be set up properly.
*/ if (wqe->wr.opcode != IB_WR_TID_RDMA_READ || delta == 0 ||
qp->s_cur == qp->s_tail) {
qp->s_state = OP(RDMA_READ_REQUEST); if (delta == 0 || qp->s_cur == qp->s_tail) goto check_s_state; else goto bail;
}
bail_no_tx:
ps->s_txreq = NULL;
qp->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 indicate which work item to wake * up.
*/
iowait_set_flag(&priv->s_iowait, IOWAIT_PENDING_IB); return 0;
}
bth0 = pkey | (OP(ACKNOWLEDGE) << 24); if (qp->s_mig_state == IB_MIG_MIGRATED)
bth0 |= IB_BTH_MIG_REQ;
bth1 = (!!is_fecn) << IB_BECN_SHIFT; /* * Inline ACKs go out without the use of the Verbs send engine, so * we need to set the STL Verbs Extended bit here
*/
bth1 |= HFI1_CAP_IS_KSET(OPFN) << IB_BTHE_E_SHIFT;
hfi1_make_bth_aeth(qp, ohdr, bth0, bth1);
}
/* We support only two types - 9B and 16B for now */ staticconst hfi1_make_rc_ack hfi1_make_rc_ack_tbl[2] = {
[HFI1_PKT_TYPE_9B] = &hfi1_make_rc_ack_9B,
[HFI1_PKT_TYPE_16B] = &hfi1_make_rc_ack_16B
};
/* * hfi1_send_rc_ack - Construct an ACK packet and send it * * This is called from hfi1_rc_rcv() and handle_receive_interrupt(). * Note that RDMA reads and atomics are handled in the * send side QP state and send engine.
*/ void hfi1_send_rc_ack(struct hfi1_packet *packet, bool is_fecn)
{ struct hfi1_ctxtdata *rcd = packet->rcd; struct rvt_qp *qp = packet->qp; struct hfi1_ibport *ibp = rcd_to_iport(rcd); struct hfi1_qp_priv *priv = qp->priv; struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
u8 sc5 = ibp->sl_to_sc[rdma_ah_get_sl(&qp->remote_ah_attr)];
u64 pbc, pbc_flags = 0;
u32 hwords = 0;
u32 nwords = 0;
u32 plen; struct pio_buf *pbuf; struct hfi1_opa_header opa_hdr;
/* clear the defer count */
qp->r_adefered = 0;
/* Don't send ACK or NAK if a RDMA read or atomic is pending. */ if (qp->s_flags & RVT_S_RESP_PENDING) {
hfi1_queue_rc_ack(packet, is_fecn); return;
}
/* Ensure s_rdma_ack_cnt changes are committed */ if (qp->s_rdma_ack_cnt) {
hfi1_queue_rc_ack(packet, is_fecn); return;
}
/* Don't try to send ACKs if the link isn't ACTIVE */ if (driver_lstate(ppd) != IB_PORT_ACTIVE) return;
/* Make the appropriate header */
hfi1_make_rc_ack_tbl[priv->hdr_type](packet, &opa_hdr, sc5, is_fecn,
&pbc_flags, &hwords, &nwords);
plen = 2 /* PBC */ + hwords + nwords;
pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps,
sc_to_vlt(ppd->dd, sc5), plen);
pbuf = sc_buffer_alloc(rcd->sc, plen, NULL, NULL); if (IS_ERR_OR_NULL(pbuf)) { /* * We have no room to send at the moment. Pass * responsibility for sending the ACK to the send engine * so that when enough buffer space becomes available, * the ACK is sent ahead of other outgoing packets.
*/
hfi1_queue_rc_ack(packet, is_fecn); return;
}
trace_ack_output_ibhdr(dd_from_ibdev(qp->ibqp.device),
&opa_hdr, ib_is_sc5(sc5));
/* write the pbc and data */
ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc,
(priv->hdr_type == HFI1_PKT_TYPE_9B ?
(void *)&opa_hdr.ibh :
(void *)&opa_hdr.opah), hwords); return;
}
/** * update_num_rd_atomic - update the qp->s_num_rd_atomic * @qp: the QP * @psn: the packet sequence number to restart at * @wqe: the wqe * * This is called from reset_psn() to update qp->s_num_rd_atomic * for the current wqe. * Called at interrupt level with the QP s_lock held.
*/ staticvoid update_num_rd_atomic(struct rvt_qp *qp, u32 psn, struct rvt_swqe *wqe)
{
u32 opcode = wqe->wr.opcode;
/** * reset_psn - reset the QP state to send starting from PSN * @qp: the QP * @psn: the packet sequence number to restart at * * This is called from hfi1_rc_rcv() to process an incoming RC ACK * for the given QP. * Called at interrupt level with the QP s_lock held.
*/ staticvoid reset_psn(struct rvt_qp *qp, u32 psn)
{
u32 n = qp->s_acked; struct rvt_swqe *wqe = rvt_get_swqe_ptr(qp, n);
u32 opcode; struct hfi1_qp_priv *priv = qp->priv;
/* * If we are starting the request from the beginning, * let the normal send code handle initialization.
*/ if (cmp_psn(psn, wqe->psn) <= 0) {
qp->s_state = OP(SEND_LAST); goto done;
}
update_num_rd_atomic(qp, psn, wqe);
/* Find the work request opcode corresponding to the given PSN. */ for (;;) { int diff;
if (++n == qp->s_size)
n = 0; if (n == qp->s_tail) break;
wqe = rvt_get_swqe_ptr(qp, n);
diff = cmp_psn(psn, wqe->psn); if (diff < 0) { /* Point wqe back to the previous one*/
wqe = rvt_get_swqe_ptr(qp, qp->s_cur); break;
}
qp->s_cur = n; /* * If we are starting the request from the beginning, * let the normal send code handle initialization.
*/ if (diff == 0) {
qp->s_state = OP(SEND_LAST); goto done;
}
/* * Set the state to restart in the middle of a request. * Don't change the s_sge, s_cur_sge, or s_cur_size. * See hfi1_make_rc_req().
*/ switch (opcode) { case IB_WR_SEND: case IB_WR_SEND_WITH_IMM:
qp->s_state = OP(RDMA_READ_RESPONSE_FIRST); break;
case IB_WR_RDMA_WRITE: case IB_WR_RDMA_WRITE_WITH_IMM:
qp->s_state = OP(RDMA_READ_RESPONSE_LAST); break;
case IB_WR_TID_RDMA_WRITE:
qp->s_state = TID_OP(WRITE_RESP); break;
case IB_WR_RDMA_READ:
qp->s_state = OP(RDMA_READ_RESPONSE_MIDDLE); break;
case IB_WR_TID_RDMA_READ:
qp->s_state = TID_OP(READ_RESP); break;
default: /* * This case shouldn't happen since its only * one PSN per req.
*/
qp->s_state = OP(SEND_LAST);
}
done:
priv->s_flags &= ~HFI1_S_TID_WAIT_INTERLCK;
qp->s_psn = psn; /* * Set RVT_S_WAIT_PSN as rc_complete() may start the timer * asynchronously before the send engine can get scheduled. * Doing it in hfi1_make_rc_req() is too late.
*/ if ((cmp_psn(qp->s_psn, qp->s_sending_hpsn) <= 0) &&
(cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) <= 0))
qp->s_flags |= RVT_S_WAIT_PSN;
qp->s_flags &= ~HFI1_S_AHG_VALID;
trace_hfi1_sender_reset_psn(qp);
}
/* * Back up requester to resend the last un-ACKed request. * The QP r_lock and s_lock should be held and interrupts disabled.
*/ void hfi1_restart_rc(struct rvt_qp *qp, u32 psn, int wait)
{ struct hfi1_qp_priv *priv = qp->priv; struct rvt_swqe *wqe = rvt_get_swqe_ptr(qp, qp->s_acked); struct hfi1_ibport *ibp;
lockdep_assert_held(&qp->r_lock);
lockdep_assert_held(&qp->s_lock);
trace_hfi1_sender_restart_rc(qp); if (qp->s_retry == 0) { if (qp->s_mig_state == IB_MIG_ARMED) {
hfi1_migrate_qp(qp);
qp->s_retry = qp->s_retry_cnt;
} elseif (qp->s_last == qp->s_acked) { /* * We need special handling for the OPFN request WQEs as * they are not allowed to generate real user errors
*/ if (wqe->wr.opcode == IB_WR_OPFN) { struct hfi1_ibport *ibp =
to_iport(qp->ibqp.device, qp->port_num); /* * Call opfn_conn_reply() with capcode and * remaining data as 0 to close out the * current request
*/
opfn_conn_reply(qp, priv->opfn.curr);
wqe = do_rc_completion(qp, wqe, ibp);
qp->s_flags &= ~RVT_S_WAIT_ACK;
} else {
trace_hfi1_tid_write_sender_restart_rc(qp, 0); if (wqe->wr.opcode == IB_WR_TID_RDMA_READ) { struct tid_rdma_request *req;
/* * Set qp->s_sending_psn to the next PSN after the given one. * This would be psn+1 except when RDMA reads or TID RDMA ops * are present.
*/ staticvoid reset_sending_psn(struct rvt_qp *qp, u32 psn)
{ struct rvt_swqe *wqe;
u32 n = qp->s_last;
lockdep_assert_held(&qp->s_lock); /* Find the work request corresponding to the given PSN. */ for (;;) {
wqe = rvt_get_swqe_ptr(qp, n); if (cmp_psn(psn, wqe->lpsn) <= 0) { if (wqe->wr.opcode == IB_WR_RDMA_READ ||
wqe->wr.opcode == IB_WR_TID_RDMA_READ ||
wqe->wr.opcode == IB_WR_TID_RDMA_WRITE)
qp->s_sending_psn = wqe->lpsn + 1; else
qp->s_sending_psn = psn + 1; break;
} if (++n == qp->s_size)
n = 0; if (n == qp->s_tail) break;
}
}
/** * hfi1_rc_verbs_aborted - handle abort status * @qp: the QP * @opah: the opa header * * This code modifies both ACK bit in BTH[2] * and the s_flags to go into send one mode. * * This serves to throttle the send engine to only * send a single packet in the likely case the * a link has gone down.
*/ void hfi1_rc_verbs_aborted(struct rvt_qp *qp, struct hfi1_opa_header *opah)
{ struct ib_other_headers *ohdr = hfi1_get_rc_ohdr(opah);
u8 opcode = ib_bth_get_opcode(ohdr);
u32 psn;
psn = ib_bth_get_psn(ohdr); /* * Don't attempt to reset the sending PSN for packets in the * KDETH PSN space since the PSN does not match anything.
*/ if (opcode != TID_OP(WRITE_DATA) &&
opcode != TID_OP(WRITE_DATA_LAST) &&
opcode != TID_OP(ACK) && opcode != TID_OP(RESYNC))
reset_sending_psn(qp, psn);
/* Handle TID RDMA WRITE packets differently */ if (opcode >= TID_OP(WRITE_REQ) &&
opcode <= TID_OP(WRITE_DATA_LAST)) {
head = priv->s_tid_head;
tail = priv->s_tid_cur; /* * s_tid_cur is set to s_tid_head in the case, where * a new TID RDMA request is being started and all * previous ones have been completed. * Therefore, we need to do a secondary check in order * to properly determine whether we should start the * RC timer.
*/
wqe = rvt_get_swqe_ptr(qp, tail);
req = wqe_to_tid_req(wqe); if (head == tail && req->comp_seg < req->total_segs) { if (tail == 0)
tail = qp->s_size - 1; else
tail -= 1;
}
} else {
head = qp->s_tail;
tail = qp->s_acked;
}
/* * Start timer after a packet requesting an ACK has been sent and * there are still requests that haven't been acked.
*/ if ((psn & IB_BTH_REQ_ACK) && tail != head &&
opcode != TID_OP(WRITE_DATA) && opcode != TID_OP(WRITE_DATA_LAST) &&
opcode != TID_OP(RESYNC) &&
!(qp->s_flags &
(RVT_S_TIMER | RVT_S_WAIT_RNR | RVT_S_WAIT_PSN)) &&
(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) { if (opcode == TID_OP(READ_REQ))
rvt_add_retry_timer_ext(qp, priv->timeout_shift); else
rvt_add_retry_timer(qp);
}
/* Start TID RDMA ACK timer */ if ((opcode == TID_OP(WRITE_DATA) ||
opcode == TID_OP(WRITE_DATA_LAST) ||
opcode == TID_OP(RESYNC)) &&
(psn & IB_BTH_REQ_ACK) &&
!(priv->s_flags & HFI1_S_TID_RETRY_TIMER) &&
(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) { /* * The TID RDMA ACK packet could be received before this * function is called. Therefore, add the timer only if TID * RDMA ACK packets are actually pending.
*/
wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
req = wqe_to_tid_req(wqe); if (wqe->wr.opcode == IB_WR_TID_RDMA_WRITE &&
req->ack_seg < req->cur_seg)
hfi1_add_tid_retry_timer(qp);
}
while (qp->s_last != qp->s_acked) {
wqe = rvt_get_swqe_ptr(qp, qp->s_last); if (cmp_psn(wqe->lpsn, qp->s_sending_psn) >= 0 &&
cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) <= 0) break;
trdma_clean_swqe(qp, wqe);
trace_hfi1_qp_send_completion(qp, wqe, qp->s_last);
rvt_qp_complete_swqe(qp,
wqe,
ib_hfi1_wc_opcode[wqe->wr.opcode],
IB_WC_SUCCESS);
} /* * If we were waiting for sends to complete before re-sending, * and they are now complete, restart sending.
*/
trace_hfi1_sendcomplete(qp, psn); if (qp->s_flags & RVT_S_WAIT_PSN &&
cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) > 0) {
qp->s_flags &= ~RVT_S_WAIT_PSN;
qp->s_sending_psn = qp->s_psn;
qp->s_sending_hpsn = qp->s_psn - 1;
hfi1_schedule_send(qp);
}
}
/* * Generate a SWQE completion. * This is similar to hfi1_send_complete but has to check to be sure * that the SGEs are not being referenced if the SWQE is being resent.
*/ struct rvt_swqe *do_rc_completion(struct rvt_qp *qp, struct rvt_swqe *wqe, struct hfi1_ibport *ibp)
{ struct hfi1_qp_priv *priv = qp->priv;
lockdep_assert_held(&qp->s_lock); /* * Don't decrement refcount and don't generate a * completion if the SWQE is being resent until the send * is finished.
*/
trace_hfi1_rc_completion(qp, wqe->lpsn); if (cmp_psn(wqe->lpsn, qp->s_sending_psn) < 0 ||
cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) > 0) {
trdma_clean_swqe(qp, wqe);
trace_hfi1_qp_send_completion(qp, wqe, qp->s_last);
rvt_qp_complete_swqe(qp,
wqe,
ib_hfi1_wc_opcode[wqe->wr.opcode],
IB_WC_SUCCESS);
} else { struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
this_cpu_inc(*ibp->rvp.rc_delayed_comp); /* * If send progress not running attempt to progress * SDMA queue.
*/ if (ppd->dd->flags & HFI1_HAS_SEND_DMA) { struct sdma_engine *engine;
u8 sl = rdma_ah_get_sl(&qp->remote_ah_attr);
u8 sc5;
/* For now use sc to find engine */
sc5 = ibp->sl_to_sc[sl];
engine = qp_to_sdma_engine(qp, sc5);
sdma_engine_progress_schedule(engine);
}
}
qp->s_retry = qp->s_retry_cnt; /* * Don't update the last PSN if the request being completed is * a TID RDMA WRITE request. * Completion of the TID RDMA WRITE requests are done by the * TID RDMA ACKs and as such could be for a request that has * already been ACKed as far as the IB state machine is * concerned.
*/ if (wqe->wr.opcode != IB_WR_TID_RDMA_WRITE)
update_last_psn(qp, wqe->lpsn);
/* * If we are completing a request which is in the process of * being resent, we can stop re-sending it since we know the * responder has already seen it.
*/ if (qp->s_acked == qp->s_cur) { if (++qp->s_cur >= qp->s_size)
qp->s_cur = 0;
qp->s_acked = qp->s_cur;
wqe = rvt_get_swqe_ptr(qp, qp->s_cur); if (qp->s_acked != qp->s_tail) {
qp->s_state = OP(SEND_LAST);
qp->s_psn = wqe->psn;
}
} else { if (++qp->s_acked >= qp->s_size)
qp->s_acked = 0; if (qp->state == IB_QPS_SQD && qp->s_acked == qp->s_cur)
qp->s_draining = 0;
wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
} if (priv->s_flags & HFI1_S_TID_WAIT_INTERLCK) {
priv->s_flags &= ~HFI1_S_TID_WAIT_INTERLCK;
hfi1_schedule_send(qp);
} return wqe;
}
/** * update_qp_retry_state - Update qp retry state. * @qp: the QP * @psn: the packet sequence number of the TID RDMA WRITE RESP. * @spsn: The start psn for the given TID RDMA WRITE swqe. * @lpsn: The last psn for the given TID RDMA WRITE swqe. * * This function is called to update the qp retry state upon * receiving a TID WRITE RESP after the qp is scheduled to retry * a request.
*/ staticvoid update_qp_retry_state(struct rvt_qp *qp, u32 psn, u32 spsn,
u32 lpsn)
{ struct hfi1_qp_priv *qpriv = qp->priv;
qp->s_psn = psn + 1; /* * If this is the first TID RDMA WRITE RESP packet for the current * request, change the s_state so that the retry will be processed * correctly. Similarly, if this is the last TID RDMA WRITE RESP * packet, change the s_state and advance the s_cur.
*/ if (cmp_psn(psn, lpsn) >= 0) {
qp->s_cur = qpriv->s_tid_cur + 1; if (qp->s_cur >= qp->s_size)
qp->s_cur = 0;
qp->s_state = TID_OP(WRITE_REQ);
} elseif (!cmp_psn(psn, spsn)) {
qp->s_cur = qpriv->s_tid_cur;
qp->s_state = TID_OP(WRITE_RESP);
}
}
/* * do_rc_ack - process an incoming RC ACK * @qp: the QP the ACK came in on * @psn: the packet sequence number of the ACK * @opcode: the opcode of the request that resulted in the ACK * * This is called from rc_rcv_resp() to process an incoming RC ACK * for the given QP. * May be called at interrupt level, with the QP s_lock held. * Returns 1 if OK, 0 if current operation should be aborted (NAK).
*/ int do_rc_ack(struct rvt_qp *qp, u32 aeth, u32 psn, int opcode,
u64 val, struct hfi1_ctxtdata *rcd)
{ struct hfi1_ibport *ibp; enum ib_wc_status status; struct hfi1_qp_priv *qpriv = qp->priv; struct rvt_swqe *wqe; int ret = 0;
u32 ack_psn; int diff; struct rvt_dev_info *rdi;
lockdep_assert_held(&qp->s_lock); /* * Note that NAKs implicitly ACK outstanding SEND and RDMA write * requests and implicitly NAK RDMA read and atomic requests issued * before the NAK'ed request. The MSN won't include the NAK'ed * request but will include an ACK'ed request(s).
*/
ack_psn = psn; if (aeth >> IB_AETH_NAK_SHIFT)
ack_psn--;
wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
ibp = rcd_to_iport(rcd);
/* * The MSN might be for a later WQE than the PSN indicates so * only complete WQEs that the PSN finishes.
*/ while ((diff = delta_psn(ack_psn, wqe->lpsn)) >= 0) { /* * RDMA_READ_RESPONSE_ONLY is a special case since * we want to generate completion events for everything * before the RDMA read, copy the data, then generate * the completion for the read.
*/ if (wqe->wr.opcode == IB_WR_RDMA_READ &&
opcode == OP(RDMA_READ_RESPONSE_ONLY) &&
diff == 0) {
ret = 1; goto bail_stop;
} /* * If this request is a RDMA read or atomic, and the ACK is * for a later operation, this ACK NAKs the RDMA read or * atomic. In other words, only a RDMA_READ_LAST or ONLY * can ACK a RDMA read and likewise for atomic ops. Note * that the NAK case can only happen if relaxed ordering is * used and requests are sent after an RDMA read or atomic * is sent but before the response is received.
*/ if ((wqe->wr.opcode == IB_WR_RDMA_READ &&
(opcode != OP(RDMA_READ_RESPONSE_LAST) || diff != 0)) ||
(wqe->wr.opcode == IB_WR_TID_RDMA_READ &&
(opcode != TID_OP(READ_RESP) || diff != 0)) ||
((wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) &&
(opcode != OP(ATOMIC_ACKNOWLEDGE) || diff != 0)) ||
(wqe->wr.opcode == IB_WR_TID_RDMA_WRITE &&
(delta_psn(psn, qp->s_last_psn) != 1))) {
set_restart_qp(qp, rcd); /* * No need to process the ACK/NAK since we are * restarting an earlier request.
*/ goto bail_stop;
} if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP ||
wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) {
u64 *vaddr = wqe->sg_list[0].vaddr;
*vaddr = val;
} if (wqe->wr.opcode == IB_WR_OPFN)
opfn_conn_reply(qp, val);
/* * TID RDMA WRITE requests will be completed by the TID RDMA * ACK packet handler (see tid_rdma.c).
*/ if (wqe->wr.opcode == IB_WR_TID_RDMA_WRITE) break;
if (qpriv->s_tid_cur != HFI1_QP_WQE_INVALID)
__w = rvt_get_swqe_ptr(qp, qpriv->s_tid_cur);
/* * Stop timers if we've received all of the TID RDMA * WRITE * responses.
*/ if (__w && __w->wr.opcode == IB_WR_TID_RDMA_WRITE &&
opcode == TID_OP(WRITE_RESP)) { /* * Normally, the loop above would correctly * process all WQEs from s_acked onward and * either complete them or check for correct * PSN sequencing. * However, for TID RDMA, due to pipelining, * the response may not be for the request at * s_acked so the above look would just be * skipped. This does not allow for checking * the PSN sequencing. It has to be done * separately.
*/ if (cmp_psn(psn, qp->s_last_psn + 1)) {
set_restart_qp(qp, rcd); goto bail_stop;
} /* * If the psn is being resent, stop the * resending.
*/ if (qp->s_cur != qp->s_tail &&
cmp_psn(qp->s_psn, psn) <= 0)
update_qp_retry_state(qp, psn,
__w->psn,
__w->lpsn); elseif (--qpriv->pending_tid_w_resp)
rvt_mod_retry_timer(qp); else
rvt_stop_rc_timers(qp);
} else { /* * We are expecting more ACKs so * mod the retry timer.
*/
rvt_mod_retry_timer(qp); /* * We can stop re-sending the earlier packets * and continue with the next packet the * receiver wants.
*/ if (cmp_psn(qp->s_psn, psn) <= 0)
reset_psn(qp, psn + 1);
}
} else { /* No more acks - kill all timers */
rvt_stop_rc_timers(qp); if (cmp_psn(qp->s_psn, psn) <= 0) {
qp->s_state = OP(SEND_LAST);
qp->s_psn = psn + 1;
}
} if (qp->s_flags & RVT_S_WAIT_ACK) {
qp->s_flags &= ~RVT_S_WAIT_ACK;
hfi1_schedule_send(qp);
}
rvt_get_credit(qp, aeth);
qp->s_rnr_retry = qp->s_rnr_retry_cnt;
qp->s_retry = qp->s_retry_cnt; /* * If the current request is a TID RDMA WRITE request and the * response is not a TID RDMA WRITE RESP packet, s_last_psn * can't be advanced.
*/ if (wqe->wr.opcode == IB_WR_TID_RDMA_WRITE &&
opcode != TID_OP(WRITE_RESP) &&
cmp_psn(psn, wqe->psn) >= 0) return 1;
update_last_psn(qp, psn); return 1;
case 1: /* RNR NAK */
ibp->rvp.n_rnr_naks++; if (qp->s_acked == qp->s_tail) goto bail_stop; if (qp->s_flags & RVT_S_WAIT_RNR) goto bail_stop;
rdi = ib_to_rvt(qp->ibqp.device); if (!(rdi->post_parms[wqe->wr.opcode].flags &
RVT_OPERATION_IGN_RNR_CNT)) { if (qp->s_rnr_retry == 0) {
status = IB_WC_RNR_RETRY_EXC_ERR; goto class_b;
} if (qp->s_rnr_retry_cnt < 7 && qp->s_rnr_retry_cnt > 0)
qp->s_rnr_retry--;
}
/* * The last valid PSN is the previous PSN. For TID RDMA WRITE * request, s_last_psn should be incremented only when a TID * RDMA WRITE RESP is received to avoid skipping lost TID RDMA * WRITE RESP packets.
*/ if (wqe->wr.opcode == IB_WR_TID_RDMA_WRITE) {
reset_psn(qp, qp->s_last_psn + 1);
} else {
update_last_psn(qp, psn - 1);
reset_psn(qp, psn);
}
case 3: /* NAK */ if (qp->s_acked == qp->s_tail) goto bail_stop; /* The last valid PSN is the previous PSN. */
update_last_psn(qp, psn - 1); switch ((aeth >> IB_AETH_CREDIT_SHIFT) &
IB_AETH_CREDIT_MASK) { case 0: /* PSN sequence error */
ibp->rvp.n_seq_naks++; /* * Back up to the responder's expected PSN. * Note that we might get a NAK in the middle of an * RDMA READ response which terminates the RDMA * READ.
*/
hfi1_restart_rc(qp, psn, 0);
hfi1_schedule_send(qp); break;
case 1: /* Invalid Request */
status = IB_WC_REM_INV_REQ_ERR;
ibp->rvp.n_other_naks++; goto class_b;
case 2: /* Remote Access Error */
status = IB_WC_REM_ACCESS_ERR;
ibp->rvp.n_other_naks++; goto class_b;
case 3: /* Remote Operation Error */
status = IB_WC_REM_OP_ERR;
ibp->rvp.n_other_naks++;
class_b: if (qp->s_last == qp->s_acked) { if (wqe->wr.opcode == IB_WR_TID_RDMA_READ)
hfi1_kern_read_tid_flow_free(qp);
/* * We have seen an out of sequence RDMA read middle or last packet. * This ACKs SENDs and RDMA writes up to the first RDMA read or atomic SWQE.
*/ staticvoid rdma_seq_err(struct rvt_qp *qp, struct hfi1_ibport *ibp, u32 psn, struct hfi1_ctxtdata *rcd)
{ struct rvt_swqe *wqe;
lockdep_assert_held(&qp->s_lock); /* Remove QP from retry timer */
rvt_stop_rc_timers(qp);
wqe = rvt_get_swqe_ptr(qp, qp->s_acked);
--> --------------------
--> maximum size reached
--> --------------------
Messung V0.5
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