diff options
Diffstat (limited to 'drivers/staging/rdma/hfi1/rc.c')
| -rw-r--r-- | drivers/staging/rdma/hfi1/rc.c | 2580 |
1 files changed, 0 insertions, 2580 deletions
diff --git a/drivers/staging/rdma/hfi1/rc.c b/drivers/staging/rdma/hfi1/rc.c deleted file mode 100644 index 792f15eb8efe..000000000000 --- a/drivers/staging/rdma/hfi1/rc.c +++ /dev/null @@ -1,2580 +0,0 @@ -/* - * Copyright(c) 2015, 2016 Intel Corporation. - * - * This file is provided under a dual BSD/GPLv2 license. When using or - * redistributing this file, you may do so under either license. - * - * GPL LICENSE SUMMARY - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of version 2 of the GNU General Public License as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * BSD LICENSE - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * - Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * - Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * - Neither the name of Intel Corporation nor the names of its - * contributors may be used to endorse or promote products derived - * from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR - * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT - * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, - * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT - * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE - * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - * - */ - -#include <linux/io.h> -#include <rdma/rdma_vt.h> -#include <rdma/rdmavt_qp.h> - -#include "hfi.h" -#include "qp.h" -#include "verbs_txreq.h" -#include "trace.h" - -/* cut down ridiculously long IB macro names */ -#define OP(x) IB_OPCODE_RC_##x - -/** - * hfi1_add_retry_timer - add/start a retry timer - * @qp - the QP - * - * add a retry timer on the QP - */ -static inline void hfi1_add_retry_timer(struct rvt_qp *qp) -{ - struct ib_qp *ibqp = &qp->ibqp; - struct rvt_dev_info *rdi = ib_to_rvt(ibqp->device); - - qp->s_flags |= RVT_S_TIMER; - /* 4.096 usec. * (1 << qp->timeout) */ - qp->s_timer.expires = jiffies + qp->timeout_jiffies + - rdi->busy_jiffies; - add_timer(&qp->s_timer); -} - -/** - * hfi1_add_rnr_timer - add/start an rnr timer - * @qp - the QP - * @to - timeout in usecs - * - * add an rnr timer on the QP - */ -void hfi1_add_rnr_timer(struct rvt_qp *qp, u32 to) -{ - struct hfi1_qp_priv *priv = qp->priv; - - qp->s_flags |= RVT_S_WAIT_RNR; - qp->s_timer.expires = jiffies + usecs_to_jiffies(to); - add_timer(&priv->s_rnr_timer); -} - -/** - * hfi1_mod_retry_timer - mod a retry timer - * @qp - the QP - * - * Modify a potentially already running retry - * timer - */ -static inline void hfi1_mod_retry_timer(struct rvt_qp *qp) -{ - struct ib_qp *ibqp = &qp->ibqp; - struct rvt_dev_info *rdi = ib_to_rvt(ibqp->device); - - qp->s_flags |= RVT_S_TIMER; - /* 4.096 usec. * (1 << qp->timeout) */ - mod_timer(&qp->s_timer, jiffies + qp->timeout_jiffies + - rdi->busy_jiffies); -} - -/** - * hfi1_stop_retry_timer - stop a retry timer - * @qp - the QP - * - * stop a retry timer and return if the timer - * had been pending. - */ -static inline int hfi1_stop_retry_timer(struct rvt_qp *qp) -{ - int rval = 0; - - /* Remove QP from retry */ - if (qp->s_flags & RVT_S_TIMER) { - qp->s_flags &= ~RVT_S_TIMER; - rval = del_timer(&qp->s_timer); - } - return rval; -} - -/** - * hfi1_stop_rc_timers - stop all timers - * @qp - the QP - * - * stop any pending timers - */ -void hfi1_stop_rc_timers(struct rvt_qp *qp) -{ - struct hfi1_qp_priv *priv = qp->priv; - - /* Remove QP from all timers */ - if (qp->s_flags & (RVT_S_TIMER | RVT_S_WAIT_RNR)) { - qp->s_flags &= ~(RVT_S_TIMER | RVT_S_WAIT_RNR); - del_timer(&qp->s_timer); - del_timer(&priv->s_rnr_timer); - } -} - -/** - * hfi1_stop_rnr_timer - stop an rnr timer - * @qp - the QP - * - * stop an rnr timer and return if the timer - * had been pending. - */ -static inline int hfi1_stop_rnr_timer(struct rvt_qp *qp) -{ - int rval = 0; - struct hfi1_qp_priv *priv = qp->priv; - - /* Remove QP from rnr timer */ - if (qp->s_flags & RVT_S_WAIT_RNR) { - qp->s_flags &= ~RVT_S_WAIT_RNR; - rval = del_timer(&priv->s_rnr_timer); - } - return rval; -} - -/** - * hfi1_del_timers_sync - wait for any timeout routines to exit - * @qp - the QP - */ -void hfi1_del_timers_sync(struct rvt_qp *qp) -{ - struct hfi1_qp_priv *priv = qp->priv; - - del_timer_sync(&qp->s_timer); - del_timer_sync(&priv->s_rnr_timer); -} - -/* only opcode mask for adaptive pio */ -const u32 rc_only_opcode = - BIT(OP(SEND_ONLY) & 0x1f) | - BIT(OP(SEND_ONLY_WITH_IMMEDIATE & 0x1f)) | - BIT(OP(RDMA_WRITE_ONLY & 0x1f)) | - BIT(OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE & 0x1f)) | - BIT(OP(RDMA_READ_REQUEST & 0x1f)) | - BIT(OP(ACKNOWLEDGE & 0x1f)) | - BIT(OP(ATOMIC_ACKNOWLEDGE & 0x1f)) | - BIT(OP(COMPARE_SWAP & 0x1f)) | - BIT(OP(FETCH_ADD & 0x1f)); - -static u32 restart_sge(struct rvt_sge_state *ss, struct rvt_swqe *wqe, - u32 psn, u32 pmtu) -{ - u32 len; - - len = delta_psn(psn, wqe->psn) * pmtu; - ss->sge = wqe->sg_list[0]; - ss->sg_list = wqe->sg_list + 1; - ss->num_sge = wqe->wr.num_sge; - ss->total_len = wqe->length; - hfi1_skip_sge(ss, len, 0); - return wqe->length - len; -} - -/** - * 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. - */ -static int make_rc_ack(struct hfi1_ibdev *dev, struct rvt_qp *qp, - struct hfi1_other_headers *ohdr, - struct hfi1_pkt_state *ps) -{ - struct rvt_ack_entry *e; - u32 hwords; - u32 len; - u32 bth0; - u32 bth2; - int middle = 0; - u32 pmtu = qp->pmtu; - struct hfi1_qp_priv *priv = qp->priv; - - /* Don't send an ACK if we aren't supposed to. */ - if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) - goto bail; - - /* header size in 32-bit words LRH+BTH = (8+12)/4. */ - hwords = 5; - - 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]; - if (e->rdma_sge.mr) { - rvt_put_mr(e->rdma_sge.mr); - e->rdma_sge.mr = NULL; - } - /* 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 (++qp->s_tail_ack_queue > HFI1_MAX_RDMA_ATOMIC) - qp->s_tail_ack_queue = 0; - /* 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]; - 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) { - 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_cur_sge = &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 = hfi1_compute_aeth(qp); - hwords++; - qp->s_ack_rdma_psn = e->psn; - bth2 = mask_psn(qp->s_ack_rdma_psn++); - } else { - /* COMPARE_SWAP or FETCH_ADD */ - qp->s_cur_sge = NULL; - len = 0; - qp->s_ack_state = OP(ATOMIC_ACKNOWLEDGE); - ohdr->u.at.aeth = hfi1_compute_aeth(qp); - ohdr->u.at.atomic_ack_eth[0] = - cpu_to_be32(e->atomic_data >> 32); - ohdr->u.at.atomic_ack_eth[1] = - cpu_to_be32(e->atomic_data); - hwords += sizeof(ohdr->u.at) / sizeof(u32); - bth2 = mask_psn(e->psn); - e->sent = 1; - } - 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): - qp->s_cur_sge = &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 = hfi1_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; - - 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); - qp->s_flags &= ~RVT_S_ACK_PENDING; - qp->s_cur_sge = NULL; - if (qp->s_nak_state) - ohdr->u.aeth = - cpu_to_be32((qp->r_msn & HFI1_MSN_MASK) | - (qp->s_nak_state << - HFI1_AETH_CREDIT_SHIFT)); - else - ohdr->u.aeth = hfi1_compute_aeth(qp); - hwords++; - len = 0; - bth0 = OP(ACKNOWLEDGE) << 24; - bth2 = mask_psn(qp->s_ack_psn); - } - qp->s_rdma_ack_cnt++; - qp->s_hdrwords = hwords; - ps->s_txreq->sde = priv->s_sde; - qp->s_cur_size = len; - hfi1_make_ruc_header(qp, ohdr, bth0, bth2, middle, ps); - /* pbc */ - ps->s_txreq->hdr_dwords = qp->s_hdrwords + 2; - return 1; - -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 - | RVT_S_AHG_VALID); - return 0; -} - -/** - * hfi1_make_rc_req - construct a request packet (SEND, RDMA r/w, ATOMIC) - * @qp: a pointer to the QP - * - * 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 hfi1_other_headers *ohdr; - struct rvt_sge_state *ss; - struct rvt_swqe *wqe; - /* header size in 32-bit words LRH+BTH = (8+12)/4. */ - u32 hwords = 5; - u32 len; - u32 bth0 = 0; - u32 bth2; - u32 pmtu = qp->pmtu; - char newreq; - int middle = 0; - int delta; - - ps->s_txreq = get_txreq(ps->dev, qp); - if (IS_ERR(ps->s_txreq)) - goto bail_no_tx; - - ohdr = &ps->s_txreq->phdr.hdr.u.oth; - if (qp->remote_ah_attr.ah_flags & IB_AH_GRH) - ohdr = &ps->s_txreq->phdr.hdr.u.l.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. */ - smp_read_barrier_depends(); /* see post_one_send() */ - if (qp->s_last == ACCESS_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_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)) - goto bail; - - if (cmp_psn(qp->s_psn, qp->s_sending_hpsn) <= 0) { - if (cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) <= 0) { - qp->s_flags |= RVT_S_WAIT_PSN; - goto bail; - } - qp->s_sending_psn = qp->s_psn; - qp->s_sending_hpsn = qp->s_psn - 1; - } - - /* Send a request. */ - wqe = rvt_get_swqe_ptr(qp, qp->s_cur); - 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 == qp->s_head) { - clear_ahg(qp); - goto bail; - } - /* - * If a fence is requested, wait for previous - * RDMA read and atomic operations to finish. - */ - if ((wqe->wr.send_flags & IB_SEND_FENCE) && - qp->s_num_rd_atomic) { - qp->s_flags |= RVT_S_WAIT_FENCE; - goto bail; - } - 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); - switch (wqe->wr.opcode) { - case IB_WR_SEND: - case IB_WR_SEND_WITH_IMM: - /* If no credit, return. */ - if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT) && - cmp_msn(wqe->ssn, qp->s_lsn + 1) > 0) { - qp->s_flags |= RVT_S_WAIT_SSN_CREDIT; - 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); - } else { - 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; - } - 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++; - /* FALLTHROUGH */ - case IB_WR_RDMA_WRITE_WITH_IMM: - /* If no credit, return. */ - if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT) && - cmp_msn(wqe->ssn, qp->s_lsn + 1) > 0) { - qp->s_flags |= RVT_S_WAIT_SSN_CREDIT; - goto bail; - } - ohdr->u.rc.reth.vaddr = - cpu_to_be64(wqe->rdma_wr.remote_addr); - 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_RDMA_READ: - /* - * Don't allow more operations to be started - * than the QP limits allow. - */ - if (newreq) { - 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++; - if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) - qp->s_lsn++; - } - ohdr->u.rc.reth.vaddr = - cpu_to_be64(wqe->rdma_wr.remote_addr); - ohdr->u.rc.reth.rkey = - cpu_to_be32(wqe->rdma_wr.rkey); - ohdr->u.rc.reth.length = cpu_to_be32(len); - qp->s_state = OP(RDMA_READ_REQUEST); - hwords += sizeof(ohdr->u.rc.reth) / sizeof(u32); - ss = NULL; - len = 0; - bth2 |= IB_BTH_REQ_ACK; - if (++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 (newreq) { - 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++; - if (!(qp->s_flags & RVT_S_UNLIMITED_CREDIT)) - qp->s_lsn++; - } - if (wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP) { - qp->s_state = OP(COMPARE_SWAP); - ohdr->u.atomic_eth.swap_data = cpu_to_be64( - wqe->atomic_wr.swap); - ohdr->u.atomic_eth.compare_data = cpu_to_be64( - wqe->atomic_wr.compare_add); - } else { - qp->s_state = OP(FETCH_ADD); - ohdr->u.atomic_eth.swap_data = cpu_to_be64( - wqe->atomic_wr.compare_add); - ohdr->u.atomic_eth.compare_data = 0; - } - ohdr->u.atomic_eth.vaddr[0] = cpu_to_be32( - wqe->atomic_wr.remote_addr >> 32); - ohdr->u.atomic_eth.vaddr[1] = cpu_to_be32( - wqe->atomic_wr.remote_addr); - 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; - - default: - goto bail; - } - 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; - if (newreq) { - qp->s_tail++; - if (qp->s_tail >= qp->s_size) - qp->s_tail = 0; - } - if (wqe->wr.opcode == IB_WR_RDMA_READ) - qp->s_psn = wqe->lpsn + 1; - else - qp->s_psn++; - 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); - } else { - 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; - } - 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; - ohdr->u.rc.reth.vaddr = - cpu_to_be64(wqe->rdma_wr.remote_addr + len); - 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; - } - qp->s_sending_hpsn = bth2; - delta = delta_psn(bth2, wqe->psn); - if (delta && delta % HFI1_PSN_CREDIT == 0) - bth2 |= IB_BTH_REQ_ACK; - if (qp->s_flags & RVT_S_SEND_ONE) { - qp->s_flags &= ~RVT_S_SEND_ONE; - qp->s_flags |= RVT_S_WAIT_ACK; - bth2 |= IB_BTH_REQ_ACK; - } - qp->s_len -= len; - qp->s_hdrwords = hwords; - ps->s_txreq->sde = priv->s_sde; - qp->s_cur_sge = ss; - qp->s_cur_size = len; - hfi1_make_ruc_header( - qp, - ohdr, - bth0 | (qp->s_state << 24), - bth2, - middle, - ps); - /* pbc */ - ps->s_txreq->hdr_dwords = qp->s_hdrwords + 2; - 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; - qp->s_flags &= ~RVT_S_BUSY; - qp->s_hdrwords = 0; - return 0; -} - -/** - * hfi1_send_rc_ack - Construct an ACK packet and send it - * @qp: a pointer to the QP - * - * 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 tasklet. - */ -void hfi1_send_rc_ack(struct hfi1_ctxtdata *rcd, struct rvt_qp *qp, - int is_fecn) -{ - struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); - struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); - u64 pbc, pbc_flags = 0; - u16 lrh0; - u16 sc5; - u32 bth0; - u32 hwords; - u32 vl, plen; - struct send_context *sc; - struct pio_buf *pbuf; - struct hfi1_ib_header hdr; - struct hfi1_other_headers *ohdr; - unsigned long flags; - - /* Don't send ACK or NAK if a RDMA read or atomic is pending. */ - if (qp->s_flags & RVT_S_RESP_PENDING) - goto queue_ack; - - /* Ensure s_rdma_ack_cnt changes are committed */ - smp_read_barrier_depends(); - if (qp->s_rdma_ack_cnt) - goto queue_ack; - - /* Construct the header */ - /* header size in 32-bit words LRH+BTH+AETH = (8+12+4)/4 */ - hwords = 6; - if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { - hwords += hfi1_make_grh(ibp, &hdr.u.l.grh, - &qp->remote_ah_attr.grh, hwords, 0); - ohdr = &hdr.u.l.oth; - lrh0 = HFI1_LRH_GRH; - } else { - ohdr = &hdr.u.oth; - lrh0 = HFI1_LRH_BTH; - } - /* read pkey_index w/o lock (its atomic) */ - bth0 = hfi1_get_pkey(ibp, qp->s_pkey_index) | (OP(ACKNOWLEDGE) << 24); - if (qp->s_mig_state == IB_MIG_MIGRATED) - bth0 |= IB_BTH_MIG_REQ; - if (qp->r_nak_state) - ohdr->u.aeth = cpu_to_be32((qp->r_msn & HFI1_MSN_MASK) | - (qp->r_nak_state << - HFI1_AETH_CREDIT_SHIFT)); - else - ohdr->u.aeth = hfi1_compute_aeth(qp); - sc5 = ibp->sl_to_sc[qp->remote_ah_attr.sl]; - /* set PBC_DC_INFO bit (aka SC[4]) in pbc_flags */ - pbc_flags |= ((!!(sc5 & 0x10)) << PBC_DC_INFO_SHIFT); - lrh0 |= (sc5 & 0xf) << 12 | (qp->remote_ah_attr.sl & 0xf) << 4; - hdr.lrh[0] = cpu_to_be16(lrh0); - hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); - hdr.lrh[2] = cpu_to_be16(hwords + SIZE_OF_CRC); - hdr.lrh[3] = cpu_to_be16(ppd->lid | qp->remote_ah_attr.src_path_bits); - ohdr->bth[0] = cpu_to_be32(bth0); - ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); - ohdr->bth[1] |= cpu_to_be32((!!is_fecn) << HFI1_BECN_SHIFT); - ohdr->bth[2] = cpu_to_be32(mask_psn(qp->r_ack_psn)); - - /* Don't try to send ACKs if the link isn't ACTIVE */ - if (driver_lstate(ppd) != IB_PORT_ACTIVE) - return; - - sc = rcd->sc; - plen = 2 /* PBC */ + hwords; - vl = sc_to_vlt(ppd->dd, sc5); - pbc = create_pbc(ppd, pbc_flags, qp->srate_mbps, vl, plen); - - pbuf = sc_buffer_alloc(sc, plen, NULL, NULL); - if (!pbuf) { - /* - * We have no room to send at the moment. Pass - * responsibility for sending the ACK to the send tasklet - * so that when enough buffer space becomes available, - * the ACK is sent ahead of other outgoing packets. - */ - goto queue_ack; - } - - trace_ack_output_ibhdr(dd_from_ibdev(qp->ibqp.device), &hdr); - - /* write the pbc and data */ - ppd->dd->pio_inline_send(ppd->dd, pbuf, pbc, &hdr, hwords); - - return; - -queue_ack: - this_cpu_inc(*ibp->rvp.rc_qacks); - spin_lock_irqsave(&qp->s_lock, flags); - qp->s_flags |= RVT_S_ACK_PENDING | RVT_S_RESP_PENDING; - qp->s_nak_state = qp->r_nak_state; - qp->s_ack_psn = qp->r_ack_psn; - if (is_fecn) - qp->s_flags |= RVT_S_ECN; - - /* Schedule the send tasklet. */ - hfi1_schedule_send(qp); - spin_unlock_irqrestore(&qp->s_lock, flags); -} - -/** - * 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. - */ -static void 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; - - qp->s_cur = n; - - /* - * 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; - } - - /* Find the work request opcode corresponding to the given PSN. */ - opcode = wqe->wr.opcode; - 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) - 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; - } - opcode = wqe->wr.opcode; - } - - /* - * 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_RDMA_READ: - qp->s_state = OP(RDMA_READ_RESPONSE_MIDDLE); - break; - - default: - /* - * This case shouldn't happen since its only - * one PSN per req. - */ - qp->s_state = OP(SEND_LAST); - } -done: - qp->s_psn = psn; - /* - * Set RVT_S_WAIT_PSN as rc_complete() may start the timer - * asynchronously before the send tasklet 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 &= ~RVT_S_AHG_VALID; -} - -/* - * Back up requester to resend the last un-ACKed request. - * The QP r_lock and s_lock should be held and interrupts disabled. - */ -static void restart_rc(struct rvt_qp *qp, u32 psn, int wait) -{ - struct rvt_swqe *wqe = rvt_get_swqe_ptr(qp, qp->s_acked); - struct hfi1_ibport *ibp; - - if (qp->s_retry == 0) { - if (qp->s_mig_state == IB_MIG_ARMED) { - hfi1_migrate_qp(qp); - qp->s_retry = qp->s_retry_cnt; - } else if (qp->s_last == qp->s_acked) { - hfi1_send_complete(qp, wqe, IB_WC_RETRY_EXC_ERR); - rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR); - return; - } else { /* need to handle delayed completion */ - return; - } - } else { - qp->s_retry--; - } - - ibp = to_iport(qp->ibqp.device, qp->port_num); - if (wqe->wr.opcode == IB_WR_RDMA_READ) - ibp->rvp.n_rc_resends++; - else - ibp->rvp.n_rc_resends += delta_psn(qp->s_psn, psn); - - qp->s_flags &= ~(RVT_S_WAIT_FENCE | RVT_S_WAIT_RDMAR | - RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_PSN | - RVT_S_WAIT_ACK); - if (wait) - qp->s_flags |= RVT_S_SEND_ONE; - reset_psn(qp, psn); -} - -/* - * This is called from s_timer for missing responses. - */ -void hfi1_rc_timeout(unsigned long arg) -{ - struct rvt_qp *qp = (struct rvt_qp *)arg; - struct hfi1_ibport *ibp; - unsigned long flags; - - spin_lock_irqsave(&qp->r_lock, flags); - spin_lock(&qp->s_lock); - if (qp->s_flags & RVT_S_TIMER) { - ibp = to_iport(qp->ibqp.device, qp->port_num); - ibp->rvp.n_rc_timeouts++; - qp->s_flags &= ~RVT_S_TIMER; - del_timer(&qp->s_timer); - trace_hfi1_rc_timeout(qp, qp->s_last_psn + 1); - restart_rc(qp, qp->s_last_psn + 1, 1); - hfi1_schedule_send(qp); - } - spin_unlock(&qp->s_lock); - spin_unlock_irqrestore(&qp->r_lock, flags); -} - -/* - * This is called from s_timer for RNR timeouts. - */ -void hfi1_rc_rnr_retry(unsigned long arg) -{ - struct rvt_qp *qp = (struct rvt_qp *)arg; - unsigned long flags; - - spin_lock_irqsave(&qp->s_lock, flags); - hfi1_stop_rnr_timer(qp); - hfi1_schedule_send(qp); - spin_unlock_irqrestore(&qp->s_lock, flags); -} - -/* - * Set qp->s_sending_psn to the next PSN after the given one. - * This would be psn+1 except when RDMA reads are present. - */ -static void reset_sending_psn(struct rvt_qp *qp, u32 psn) -{ - struct rvt_swqe *wqe; - u32 n = qp->s_last; - - /* 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) - 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; - } -} - -/* - * This should be called with the QP s_lock held and interrupts disabled. - */ -void hfi1_rc_send_complete(struct rvt_qp *qp, struct hfi1_ib_header *hdr) -{ - struct hfi1_other_headers *ohdr; - struct rvt_swqe *wqe; - struct ib_wc wc; - unsigned i; - u32 opcode; - u32 psn; - - if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_OR_FLUSH_SEND)) - return; - - /* Find out where the BTH is */ - if ((be16_to_cpu(hdr->lrh[0]) & 3) == HFI1_LRH_BTH) - ohdr = &hdr->u.oth; - else - ohdr = &hdr->u.l.oth; - - opcode = be32_to_cpu(ohdr->bth[0]) >> 24; - if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) && - opcode <= OP(ATOMIC_ACKNOWLEDGE)) { - WARN_ON(!qp->s_rdma_ack_cnt); - qp->s_rdma_ack_cnt--; - return; - } - - psn = be32_to_cpu(ohdr->bth[2]); - reset_sending_psn(qp, psn); - - /* - * 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) && qp->s_acked != qp->s_tail && - !(qp->s_flags & - (RVT_S_TIMER | RVT_S_WAIT_RNR | RVT_S_WAIT_PSN)) && - (ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK)) - hfi1_add_retry_timer(qp); - - while (qp->s_last != qp->s_acked) { - u32 s_last; - - 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; - s_last = qp->s_last; - if (++s_last >= qp->s_size) - s_last = 0; - qp->s_last = s_last; - /* see post_send() */ - barrier(); - for (i = 0; i < wqe->wr.num_sge; i++) { - struct rvt_sge *sge = &wqe->sg_list[i]; - - rvt_put_mr(sge->mr); - } - /* Post a send completion queue entry if requested. */ - if (!(qp->s_flags & RVT_S_SIGNAL_REQ_WR) || - (wqe->wr.send_flags & IB_SEND_SIGNALED)) { - memset(&wc, 0, sizeof(wc)); - wc.wr_id = wqe->wr.wr_id; - wc.status = IB_WC_SUCCESS; - wc.opcode = ib_hfi1_wc_opcode[wqe->wr.opcode]; - wc.byte_len = wqe->length; - wc.qp = &qp->ibqp; - rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.send_cq), &wc, 0); - } - } - /* - * If we were waiting for sends to complete before re-sending, - * and they are now complete, restart sending. - */ - trace_hfi1_rc_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); - } -} - -static inline void update_last_psn(struct rvt_qp *qp, u32 psn) -{ - qp->s_last_psn = psn; -} - -/* - * 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. - */ -static struct rvt_swqe *do_rc_completion(struct rvt_qp *qp, - struct rvt_swqe *wqe, - struct hfi1_ibport *ibp) -{ - struct ib_wc wc; - unsigned i; - - /* - * Don't decrement refcount and don't generate a - * completion if the SWQE is being resent until the send - * is finished. - */ - if (cmp_psn(wqe->lpsn, qp->s_sending_psn) < 0 || - cmp_psn(qp->s_sending_psn, qp->s_sending_hpsn) > 0) { - u32 s_last; - - for (i = 0; i < wqe->wr.num_sge; i++) { - struct rvt_sge *sge = &wqe->sg_list[i]; - - rvt_put_mr(sge->mr); - } - s_last = qp->s_last; - if (++s_last >= qp->s_size) - s_last = 0; - qp->s_last = s_last; - /* see post_send() */ - barrier(); - /* Post a send completion queue entry if requested. */ - if (!(qp->s_flags & RVT_S_SIGNAL_REQ_WR) || - (wqe->wr.send_flags & IB_SEND_SIGNALED)) { - memset(&wc, 0, sizeof(wc)); - wc.wr_id = wqe->wr.wr_id; - wc.status = IB_WC_SUCCESS; - wc.opcode = ib_hfi1_wc_opcode[wqe->wr.opcode]; - wc.byte_len = wqe->length; - wc.qp = &qp->ibqp; - rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.send_cq), &wc, 0); - } - } 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 sc5; - - /* For now use sc to find engine */ - sc5 = ibp->sl_to_sc[qp->remote_ah_attr.sl]; - engine = qp_to_sdma_engine(qp, sc5); - sdma_engine_progress_schedule(engine); - } - } - - qp->s_retry = qp->s_retry_cnt; - 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); - } - return wqe; -} - -/** - * 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). - */ -static 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 rvt_swqe *wqe; - int ret = 0; - u32 ack_psn; - int diff; - unsigned long to; - - /* - * 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 >> 29) - ack_psn--; - wqe = rvt_get_swqe_ptr(qp, qp->s_acked); - ibp = to_iport(qp->ibqp.device, qp->port_num); - - /* - * 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_ATOMIC_CMP_AND_SWP || - wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) && - (opcode != OP(ATOMIC_ACKNOWLEDGE) || diff != 0))) { - /* Retry this request. */ - if (!(qp->r_flags & RVT_R_RDMAR_SEQ)) { - qp->r_flags |= RVT_R_RDMAR_SEQ; - restart_rc(qp, qp->s_last_psn + 1, 0); - if (list_empty(&qp->rspwait)) { - qp->r_flags |= RVT_R_RSP_SEND; - atomic_inc(&qp->refcount); - list_add_tail(&qp->rspwait, - &rcd->qp_wait_list); - } - } - /* - * 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 (qp->s_num_rd_atomic && - (wqe->wr.opcode == IB_WR_RDMA_READ || - wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || - wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD)) { - qp->s_num_rd_atomic--; - /* Restart sending task if fence is complete */ - if ((qp->s_flags & RVT_S_WAIT_FENCE) && - !qp->s_num_rd_atomic) { - qp->s_flags &= ~(RVT_S_WAIT_FENCE | - RVT_S_WAIT_ACK); - hfi1_schedule_send(qp); - } else if (qp->s_flags & RVT_S_WAIT_RDMAR) { - qp->s_flags &= ~(RVT_S_WAIT_RDMAR | - RVT_S_WAIT_ACK); - hfi1_schedule_send(qp); - } - } - wqe = do_rc_completion(qp, wqe, ibp); - if (qp->s_acked == qp->s_tail) - break; - } - - switch (aeth >> 29) { - case 0: /* ACK */ - this_cpu_inc(*ibp->rvp.rc_acks); - if (qp->s_acked != qp->s_tail) { - /* - * We are expecting more ACKs so - * mod the retry timer. - */ - hfi1_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 */ - hfi1_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); - } - hfi1_get_credit(qp, aeth); - qp->s_rnr_retry = qp->s_rnr_retry_cnt; - qp->s_retry = qp->s_retry_cnt; - 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; - 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--; - - /* The last valid PSN is the previous PSN. */ - update_last_psn(qp, psn - 1); - - ibp->rvp.n_rc_resends += delta_psn(qp->s_psn, psn); - - reset_psn(qp, psn); - - qp->s_flags &= ~(RVT_S_WAIT_SSN_CREDIT | RVT_S_WAIT_ACK); - hfi1_stop_rc_timers(qp); - to = - ib_hfi1_rnr_table[(aeth >> HFI1_AETH_CREDIT_SHIFT) & - HFI1_AETH_CREDIT_MASK]; - hfi1_add_rnr_timer(qp, to); - return 0; - - 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 >> HFI1_AETH_CREDIT_SHIFT) & - HFI1_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. - */ - 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) { - hfi1_send_complete(qp, wqe, status); - rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR); - } - break; - - default: - /* Ignore other reserved NAK error codes */ - goto reserved; - } - qp->s_retry = qp->s_retry_cnt; - qp->s_rnr_retry = qp->s_rnr_retry_cnt; - goto bail_stop; - - default: /* 2: reserved */ -reserved: - /* Ignore reserved NAK codes. */ - goto bail_stop; - } - /* cannot be reached */ -bail_stop: - hfi1_stop_rc_timers(qp); - return ret; -} - -/* - * 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. - */ -static void rdma_seq_err(struct rvt_qp *qp, struct hfi1_ibport *ibp, u32 psn, - struct hfi1_ctxtdata *rcd) -{ - struct rvt_swqe *wqe; - - /* Remove QP from retry timer */ - hfi1_stop_rc_timers(qp); - - wqe = rvt_get_swqe_ptr(qp, qp->s_acked); - - while (cmp_psn(psn, wqe->lpsn) > 0) { - if (wqe->wr.opcode == IB_WR_RDMA_READ || - wqe->wr.opcode == IB_WR_ATOMIC_CMP_AND_SWP || - wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) - break; - wqe = do_rc_completion(qp, wqe, ibp); - } - - ibp->rvp.n_rdma_seq++; - qp->r_flags |= RVT_R_RDMAR_SEQ; - restart_rc(qp, qp->s_last_psn + 1, 0); - if (list_empty(&qp->rspwait)) { - qp->r_flags |= RVT_R_RSP_SEND; - atomic_inc(&qp->refcount); - list_add_tail(&qp->rspwait, &rcd->qp_wait_list); - } -} - -/** - * rc_rcv_resp - process an incoming RC response packet - * @ibp: the port this packet came in on - * @ohdr: the other headers for this packet - * @data: the packet data - * @tlen: the packet length - * @qp: the QP for this packet - * @opcode: the opcode for this packet - * @psn: the packet sequence number for this packet - * @hdrsize: the header length - * @pmtu: the path MTU - * - * This is called from hfi1_rc_rcv() to process an incoming RC response - * packet for the given QP. - * Called at interrupt level. - */ -static void rc_rcv_resp(struct hfi1_ibport *ibp, - struct hfi1_other_headers *ohdr, - void *data, u32 tlen, struct rvt_qp *qp, - u32 opcode, u32 psn, u32 hdrsize, u32 pmtu, - struct hfi1_ctxtdata *rcd) -{ - struct rvt_swqe *wqe; - enum ib_wc_status status; - unsigned long flags; - int diff; - u32 pad; - u32 aeth; - u64 val; - - spin_lock_irqsave(&qp->s_lock, flags); - - trace_hfi1_rc_ack(qp, psn); - - /* Ignore invalid responses. */ - smp_read_barrier_depends(); /* see post_one_send */ - if (cmp_psn(psn, ACCESS_ONCE(qp->s_next_psn)) >= 0) - goto ack_done; - - /* Ignore duplicate responses. */ - diff = cmp_psn(psn, qp->s_last_psn); - if (unlikely(diff <= 0)) { - /* Update credits for "ghost" ACKs */ - if (diff == 0 && opcode == OP(ACKNOWLEDGE)) { - aeth = be32_to_cpu(ohdr->u.aeth); - if ((aeth >> 29) == 0) - hfi1_get_credit(qp, aeth); - } - goto ack_done; - } - - /* - * Skip everything other than the PSN we expect, if we are waiting - * for a reply to a restarted RDMA read or atomic op. - */ - if (qp->r_flags & RVT_R_RDMAR_SEQ) { - if (cmp_psn(psn, qp->s_last_psn + 1) != 0) - goto ack_done; - qp->r_flags &= ~RVT_R_RDMAR_SEQ; - } - - if (unlikely(qp->s_acked == qp->s_tail)) - goto ack_done; - wqe = rvt_get_swqe_ptr(qp, qp->s_acked); - status = IB_WC_SUCCESS; - - switch (opcode) { - case OP(ACKNOWLEDGE): - case OP(ATOMIC_ACKNOWLEDGE): - case OP(RDMA_READ_RESPONSE_FIRST): - aeth = be32_to_cpu(ohdr->u.aeth); - if (opcode == OP(ATOMIC_ACKNOWLEDGE)) { - __be32 *p = ohdr->u.at.atomic_ack_eth; - - val = ((u64)be32_to_cpu(p[0]) << 32) | - be32_to_cpu(p[1]); - } else { - val = 0; - } - if (!do_rc_ack(qp, aeth, psn, opcode, val, rcd) || - opcode != OP(RDMA_READ_RESPONSE_FIRST)) - goto ack_done; - wqe = rvt_get_swqe_ptr(qp, qp->s_acked); - if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) - goto ack_op_err; - /* - * If this is a response to a resent RDMA read, we - * have to be careful to copy the data to the right - * location. - */ - qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, - wqe, psn, pmtu); - goto read_middle; - - case OP(RDMA_READ_RESPONSE_MIDDLE): - /* no AETH, no ACK */ - if (unlikely(cmp_psn(psn, qp->s_last_psn + 1))) - goto ack_seq_err; - if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) - goto ack_op_err; -read_middle: - if (unlikely(tlen != (hdrsize + pmtu + 4))) - goto ack_len_err; - if (unlikely(pmtu >= qp->s_rdma_read_len)) - goto ack_len_err; - - /* - * We got a response so update the timeout. - * 4.096 usec. * (1 << qp->timeout) - */ - qp->s_flags |= RVT_S_TIMER; - mod_timer(&qp->s_timer, jiffies + qp->timeout_jiffies); - if (qp->s_flags & RVT_S_WAIT_ACK) { - qp->s_flags &= ~RVT_S_WAIT_ACK; - hfi1_schedule_send(qp); - } - - if (opcode == OP(RDMA_READ_RESPONSE_MIDDLE)) - qp->s_retry = qp->s_retry_cnt; - - /* - * Update the RDMA receive state but do the copy w/o - * holding the locks and blocking interrupts. - */ - qp->s_rdma_read_len -= pmtu; - update_last_psn(qp, psn); - spin_unlock_irqrestore(&qp->s_lock, flags); - hfi1_copy_sge(&qp->s_rdma_read_sge, data, pmtu, 0, 0); - goto bail; - - case OP(RDMA_READ_RESPONSE_ONLY): - aeth = be32_to_cpu(ohdr->u.aeth); - if (!do_rc_ack(qp, aeth, psn, opcode, 0, rcd)) - goto ack_done; - /* Get the number of bytes the message was padded by. */ - pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; - /* - * Check that the data size is >= 0 && <= pmtu. - * Remember to account for ICRC (4). - */ - if (unlikely(tlen < (hdrsize + pad + 4))) - goto ack_len_err; - /* - * If this is a response to a resent RDMA read, we - * have to be careful to copy the data to the right - * location. - */ - wqe = rvt_get_swqe_ptr(qp, qp->s_acked); - qp->s_rdma_read_len = restart_sge(&qp->s_rdma_read_sge, - wqe, psn, pmtu); - goto read_last; - - case OP(RDMA_READ_RESPONSE_LAST): - /* ACKs READ req. */ - if (unlikely(cmp_psn(psn, qp->s_last_psn + 1))) - goto ack_seq_err; - if (unlikely(wqe->wr.opcode != IB_WR_RDMA_READ)) - goto ack_op_err; - /* Get the number of bytes the message was padded by. */ - pad = (be32_to_cpu(ohdr->bth[0]) >> 20) & 3; - /* - * Check that the data size is >= 1 && <= pmtu. - * Remember to account for ICRC (4). - */ - if (unlikely(tlen <= (hdrsize + pad + 4))) - goto ack_len_err; -read_last: - tlen -= hdrsize + pad + 4; - if (unlikely(tlen != qp->s_rdma_read_len)) - goto ack_len_err; - aeth = be32_to_cpu(ohdr->u.aeth); - hfi1_copy_sge(&qp->s_rdma_read_sge, data, tlen, 0, 0); - WARN_ON(qp->s_rdma_read_sge.num_sge); - (void)do_rc_ack(qp, aeth, psn, - OP(RDMA_READ_RESPONSE_LAST), 0, rcd); - goto ack_done; - } - -ack_op_err: - status = IB_WC_LOC_QP_OP_ERR; - goto ack_err; - -ack_seq_err: - rdma_seq_err(qp, ibp, psn, rcd); - goto ack_done; - -ack_len_err: - status = IB_WC_LOC_LEN_ERR; -ack_err: - if (qp->s_last == qp->s_acked) { - hfi1_send_complete(qp, wqe, status); - rvt_error_qp(qp, IB_WC_WR_FLUSH_ERR); - } -ack_done: - spin_unlock_irqrestore(&qp->s_lock, flags); -bail: - return; -} - -static inline void rc_defered_ack(struct hfi1_ctxtdata *rcd, - struct rvt_qp *qp) -{ - if (list_empty(&qp->rspwait)) { - qp->r_flags |= RVT_R_RSP_NAK; - atomic_inc(&qp->refcount); - list_add_tail(&qp->rspwait, &rcd->qp_wait_list); - } -} - -static inline void rc_cancel_ack(struct rvt_qp *qp) -{ - struct hfi1_qp_priv *priv = qp->priv; - - priv->r_adefered = 0; - if (list_empty(&qp->rspwait)) - return; - list_del_init(&qp->rspwait); - qp->r_flags &= ~RVT_R_RSP_NAK; - if (atomic_dec_and_test(&qp->refcount)) - wake_up(&qp->wait); -} - -/** - * rc_rcv_error - process an incoming duplicate or error RC packet - * @ohdr: the other headers for this packet - * @data: the packet data - * @qp: the QP for this packet - * @opcode: the opcode for this packet - * @psn: the packet sequence number for this packet - * @diff: the difference between the PSN and the expected PSN - * - * This is called from hfi1_rc_rcv() to process an unexpected - * incoming RC packet for the given QP. - * Called at interrupt level. - * Return 1 if no more processing is needed; otherwise return 0 to - * schedule a response to be sent. - */ -static noinline int rc_rcv_error(struct hfi1_other_headers *ohdr, void *data, - struct rvt_qp *qp, u32 opcode, u32 psn, - int diff, struct hfi1_ctxtdata *rcd) -{ - struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); - struct rvt_ack_entry *e; - unsigned long flags; - u8 i, prev; - int old_req; - - trace_hfi1_rc_rcv_error(qp, psn); - if (diff > 0) { - /* - * Packet sequence error. - * A NAK will ACK earlier sends and RDMA writes. - * Don't queue the NAK if we already sent one. - */ - if (!qp->r_nak_state) { - ibp->rvp.n_rc_seqnak++; - qp->r_nak_state = IB_NAK_PSN_ERROR; - /* Use the expected PSN. */ - qp->r_ack_psn = qp->r_psn; - /* - * Wait to send the sequence NAK until all packets - * in the receive queue have been processed. - * Otherwise, we end up propagating congestion. - */ - rc_defered_ack(rcd, qp); - } - goto done; - } - - /* - * Handle a duplicate request. Don't re-execute SEND, RDMA - * write or atomic op. Don't NAK errors, just silently drop - * the duplicate request. Note that r_sge, r_len, and - * r_rcv_len may be in use so don't modify them. - * - * We are supposed to ACK the earliest duplicate PSN but we - * can coalesce an outstanding duplicate ACK. We have to - * send the earliest so that RDMA reads can be restarted at - * the requester's expected PSN. - * - * First, find where this duplicate PSN falls within the - * ACKs previously sent. - * old_req is true if there is an older response that is scheduled - * to be sent before sending this one. - */ - e = NULL; - old_req = 1; - ibp->rvp.n_rc_dupreq++; - - spin_lock_irqsave(&qp->s_lock, flags); - - for (i = qp->r_head_ack_queue; ; i = prev) { - if (i == qp->s_tail_ack_queue) - old_req = 0; - if (i) - prev = i - 1; - else - prev = HFI1_MAX_RDMA_ATOMIC; - if (prev == qp->r_head_ack_queue) { - e = NULL; - break; - } - e = &qp->s_ack_queue[prev]; - if (!e->opcode) { - e = NULL; - break; - } - if (cmp_psn(psn, e->psn) >= 0) { - if (prev == qp->s_tail_ack_queue && - cmp_psn(psn, e->lpsn) <= 0) - old_req = 0; - break; - } - } - switch (opcode) { - case OP(RDMA_READ_REQUEST): { - struct ib_reth *reth; - u32 offset; - u32 len; - - /* - * If we didn't find the RDMA read request in the ack queue, - * we can ignore this request. - */ - if (!e || e->opcode != OP(RDMA_READ_REQUEST)) - goto unlock_done; - /* RETH comes after BTH */ - reth = &ohdr->u.rc.reth; - /* - * Address range must be a subset of the original - * request and start on pmtu boundaries. - * We reuse the old ack_queue slot since the requester - * should not back up and request an earlier PSN for the - * same request. - */ - offset = delta_psn(psn, e->psn) * qp->pmtu; - len = be32_to_cpu(reth->length); - if (unlikely(offset + len != e->rdma_sge.sge_length)) - goto unlock_done; - if (e->rdma_sge.mr) { - rvt_put_mr(e->rdma_sge.mr); - e->rdma_sge.mr = NULL; - } - if (len != 0) { - u32 rkey = be32_to_cpu(reth->rkey); - u64 vaddr = be64_to_cpu(reth->vaddr); - int ok; - - ok = rvt_rkey_ok(qp, &e->rdma_sge, len, vaddr, rkey, - IB_ACCESS_REMOTE_READ); - if (unlikely(!ok)) - goto unlock_done; - } else { - e->rdma_sge.vaddr = NULL; - e->rdma_sge.length = 0; - e->rdma_sge.sge_length = 0; - } - e->psn = psn; - if (old_req) - goto unlock_done; - qp->s_tail_ack_queue = prev; - break; - } - - case OP(COMPARE_SWAP): - case OP(FETCH_ADD): { - /* - * If we didn't find the atomic request in the ack queue - * or the send tasklet is already backed up to send an - * earlier entry, we can ignore this request. - */ - if (!e || e->opcode != (u8)opcode || old_req) - goto unlock_done; - qp->s_tail_ack_queue = prev; - break; - } - - default: - /* - * Ignore this operation if it doesn't request an ACK - * or an earlier RDMA read or atomic is going to be resent. - */ - if (!(psn & IB_BTH_REQ_ACK) || old_req) - goto unlock_done; - /* - * Resend the most recent ACK if this request is - * after all the previous RDMA reads and atomics. - */ - if (i == qp->r_head_ack_queue) { - spin_unlock_irqrestore(&qp->s_lock, flags); - qp->r_nak_state = 0; - qp->r_ack_psn = qp->r_psn - 1; - goto send_ack; - } - - /* - * Resend the RDMA read or atomic op which - * ACKs this duplicate request. - */ - qp->s_tail_ack_queue = i; - break; - } - qp->s_ack_state = OP(ACKNOWLEDGE); - qp->s_flags |= RVT_S_RESP_PENDING; - qp->r_nak_state = 0; - hfi1_schedule_send(qp); - -unlock_done: - spin_unlock_irqrestore(&qp->s_lock, flags); -done: - return 1; - -send_ack: - return 0; -} - -void hfi1_rc_error(struct rvt_qp *qp, enum ib_wc_status err) -{ - unsigned long flags; - int lastwqe; - - spin_lock_irqsave(&qp->s_lock, flags); - lastwqe = rvt_error_qp(qp, err); - spin_unlock_irqrestore(&qp->s_lock, flags); - - if (lastwqe) { - struct ib_event ev; - - ev.device = qp->ibqp.device; - ev.element.qp = &qp->ibqp; - ev.event = IB_EVENT_QP_LAST_WQE_REACHED; - qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); - } -} - -static inline void update_ack_queue(struct rvt_qp *qp, unsigned n) -{ - unsigned next; - - next = n + 1; - if (next > HFI1_MAX_RDMA_ATOMIC) - next = 0; - qp->s_tail_ack_queue = next; - qp->s_ack_state = OP(ACKNOWLEDGE); -} - -static void log_cca_event(struct hfi1_pportdata *ppd, u8 sl, u32 rlid, - u32 lqpn, u32 rqpn, u8 svc_type) -{ - struct opa_hfi1_cong_log_event_internal *cc_event; - unsigned long flags; - - if (sl >= OPA_MAX_SLS) - return; - - spin_lock_irqsave(&ppd->cc_log_lock, flags); - - ppd->threshold_cong_event_map[sl / 8] |= 1 << (sl % 8); - ppd->threshold_event_counter++; - - cc_event = &ppd->cc_events[ppd->cc_log_idx++]; - if (ppd->cc_log_idx == OPA_CONG_LOG_ELEMS) - ppd->cc_log_idx = 0; - cc_event->lqpn = lqpn & RVT_QPN_MASK; - cc_event->rqpn = rqpn & RVT_QPN_MASK; - cc_event->sl = sl; - cc_event->svc_type = svc_type; - cc_event->rlid = rlid; - /* keep timestamp in units of 1.024 usec */ - cc_event->timestamp = ktime_to_ns(ktime_get()) / 1024; - - spin_unlock_irqrestore(&ppd->cc_log_lock, flags); -} - -void process_becn(struct hfi1_pportdata *ppd, u8 sl, u16 rlid, u32 lqpn, - u32 rqpn, u8 svc_type) -{ - struct cca_timer *cca_timer; - u16 ccti, ccti_incr, ccti_timer, ccti_limit; - u8 trigger_threshold; - struct cc_state *cc_state; - unsigned long flags; - - if (sl >= OPA_MAX_SLS) - return; - - cc_state = get_cc_state(ppd); - - if (!cc_state) - return; - - /* - * 1) increase CCTI (for this SL) - * 2) select IPG (i.e., call set_link_ipg()) - * 3) start timer - */ - ccti_limit = cc_state->cct.ccti_limit; - ccti_incr = cc_state->cong_setting.entries[sl].ccti_increase; - ccti_timer = cc_state->cong_setting.entries[sl].ccti_timer; - trigger_threshold = - cc_state->cong_setting.entries[sl].trigger_threshold; - - spin_lock_irqsave(&ppd->cca_timer_lock, flags); - - cca_timer = &ppd->cca_timer[sl]; - if (cca_timer->ccti < ccti_limit) { - if (cca_timer->ccti + ccti_incr <= ccti_limit) - cca_timer->ccti += ccti_incr; - else - cca_timer->ccti = ccti_limit; - set_link_ipg(ppd); - } - - ccti = cca_timer->ccti; - - if (!hrtimer_active(&cca_timer->hrtimer)) { - /* ccti_timer is in units of 1.024 usec */ - unsigned long nsec = 1024 * ccti_timer; - - hrtimer_start(&cca_timer->hrtimer, ns_to_ktime(nsec), - HRTIMER_MODE_REL); - } - - spin_unlock_irqrestore(&ppd->cca_timer_lock, flags); - - if ((trigger_threshold != 0) && (ccti >= trigger_threshold)) - log_cca_event(ppd, sl, rlid, lqpn, rqpn, svc_type); -} - -/** - * hfi1_rc_rcv - process an incoming RC packet - * @rcd: the context pointer - * @hdr: the header of this packet - * @rcv_flags: flags relevant to rcv processing - * @data: the packet data - * @tlen: the packet length - * @qp: the QP for this packet - * - * This is called from qp_rcv() to process an incoming RC packet - * for the given QP. - * May be called at interrupt level. - */ -void hfi1_rc_rcv(struct hfi1_packet *packet) -{ - struct hfi1_ctxtdata *rcd = packet->rcd; - struct hfi1_ib_header *hdr = packet->hdr; - u32 rcv_flags = packet->rcv_flags; - void *data = packet->ebuf; - u32 tlen = packet->tlen; - struct rvt_qp *qp = packet->qp; - struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); - struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); - struct hfi1_other_headers *ohdr = packet->ohdr; - u32 bth0, opcode; - u32 hdrsize = packet->hlen; - u32 psn; - u32 pad; - struct ib_wc wc; - u32 pmtu = qp->pmtu; - int diff; - struct ib_reth *reth; - unsigned long flags; - u32 bth1; - int ret, is_fecn = 0; - int copy_last = 0; - - bth0 = be32_to_cpu(ohdr->bth[0]); - if (hfi1_ruc_check_hdr(ibp, hdr, rcv_flags & HFI1_HAS_GRH, qp, bth0)) - return; - - bth1 = be32_to_cpu(ohdr->bth[1]); - if (unlikely(bth1 & (HFI1_BECN_SMASK | HFI1_FECN_SMASK))) { - if (bth1 & HFI1_BECN_SMASK) { - u16 rlid = qp->remote_ah_attr.dlid; - u32 lqpn, rqpn; - - lqpn = qp->ibqp.qp_num; - rqpn = qp->remote_qpn; - process_becn( - ppd, - qp->remote_ah_attr.sl, - rlid, lqpn, rqpn, - IB_CC_SVCTYPE_RC); - } - is_fecn = bth1 & HFI1_FECN_SMASK; - } - - psn = be32_to_cpu(ohdr->bth[2]); - opcode = (bth0 >> 24) & 0xff; - - /* - * Process responses (ACKs) before anything else. Note that the - * packet sequence number will be for something in the send work - * queue rather than the expected receive packet sequence number. - * In other words, this QP is the requester. - */ - if (opcode >= OP(RDMA_READ_RESPONSE_FIRST) && - opcode <= OP(ATOMIC_ACKNOWLEDGE)) { - rc_rcv_resp(ibp, ohdr, data, tlen, qp, opcode, psn, - hdrsize, pmtu, rcd); - if (is_fecn) - goto send_ack; - return; - } - - /* Compute 24 bits worth of difference. */ - diff = delta_psn(psn, qp->r_psn); - if (unlikely(diff)) { - if (rc_rcv_error(ohdr, data, qp, opcode, psn, diff, rcd)) - return; - goto send_ack; - } - - /* Check for opcode sequence errors. */ - switch (qp->r_state) { - case OP(SEND_FIRST): - case OP(SEND_MIDDLE): - if (opcode == OP(SEND_MIDDLE) || - opcode == OP(SEND_LAST) || - opcode == OP(SEND_LAST_WITH_IMMEDIATE)) - break; - goto nack_inv; - - case OP(RDMA_WRITE_FIRST): - case OP(RDMA_WRITE_MIDDLE): - if (opcode == OP(RDMA_WRITE_MIDDLE) || - opcode == OP(RDMA_WRITE_LAST) || - opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) - break; - goto nack_inv; - - default: - if (opcode == OP(SEND_MIDDLE) || - opcode == OP(SEND_LAST) || - opcode == OP(SEND_LAST_WITH_IMMEDIATE) || - opcode == OP(RDMA_WRITE_MIDDLE) || - opcode == OP(RDMA_WRITE_LAST) || - opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE)) - goto nack_inv; - /* - * Note that it is up to the requester to not send a new - * RDMA read or atomic operation before receiving an ACK - * for the previous operation. - */ - break; - } - - if (qp->state == IB_QPS_RTR && !(qp->r_flags & RVT_R_COMM_EST)) - qp_comm_est(qp); - - /* OK, process the packet. */ - switch (opcode) { - case OP(SEND_FIRST): - ret = hfi1_rvt_get_rwqe(qp, 0); - if (ret < 0) - goto nack_op_err; - if (!ret) - goto rnr_nak; - qp->r_rcv_len = 0; - /* FALLTHROUGH */ - case OP(SEND_MIDDLE): - case OP(RDMA_WRITE_MIDDLE): -send_middle: - /* Check for invalid length PMTU or posted rwqe len. */ - if (unlikely(tlen != (hdrsize + pmtu + 4))) - goto nack_inv; - qp->r_rcv_len += pmtu; - if (unlikely(qp->r_rcv_len > qp->r_len)) - goto nack_inv; - hfi1_copy_sge(&qp->r_sge, data, pmtu, 1, 0); - break; - - case OP(RDMA_WRITE_LAST_WITH_IMMEDIATE): - /* consume RWQE */ - ret = hfi1_rvt_get_rwqe(qp, 1); - if (ret < 0) - goto nack_op_err; - if (!ret) - goto rnr_nak; - goto send_last_imm; - - case OP(SEND_ONLY): - case OP(SEND_ONLY_WITH_IMMEDIATE): - ret = hfi1_rvt_get_rwqe(qp, 0); - if (ret < 0) - goto nack_op_err; - if (!ret) - goto rnr_nak; - qp->r_rcv_len = 0; - if (opcode == OP(SEND_ONLY)) - 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; - wc.wc_flags = IB_WC_WITH_IMM; - goto send_last; - case OP(RDMA_WRITE_LAST): - copy_last = ibpd_to_rvtpd(qp->ibqp.pd)->user; - /* fall through */ - case OP(SEND_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 = (bth0 >> 20) & 3; - /* Check for invalid length. */ - /* LAST len should be >= 1 */ - if (unlikely(tlen < (hdrsize + pad + 4))) - goto nack_inv; - /* Don't count the CRC. */ - tlen -= (hdrsize + pad + 4); - wc.byte_len = tlen + qp->r_rcv_len; - if (unlikely(wc.byte_len > qp->r_len)) - goto nack_inv; - hfi1_copy_sge(&qp->r_sge, data, tlen, 1, copy_last); - rvt_put_ss(&qp->r_sge); - qp->r_msn++; - if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags)) - break; - wc.wr_id = qp->r_wr_id; - wc.status = IB_WC_SUCCESS; - if (opcode == OP(RDMA_WRITE_LAST_WITH_IMMEDIATE) || - opcode == OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE)) - wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; - else - wc.opcode = IB_WC_RECV; - wc.qp = &qp->ibqp; - wc.src_qp = qp->remote_qpn; - wc.slid = qp->remote_ah_attr.dlid; - /* - * It seems that IB mandates the presence of an SL in a - * work completion only for the UD transport (see section - * 11.4.2 of IBTA Vol. 1). - * - * However, the way the SL is chosen below is consistent - * with the way that IB/qib works and is trying avoid - * introducing incompatibilities. - * - * See also OPA Vol. 1, section 9.7.6, and table 9-17. - */ - 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; - /* 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); - break; - - case OP(RDMA_WRITE_ONLY): - copy_last = 1; - /* fall through */ - case OP(RDMA_WRITE_FIRST): - case OP(RDMA_WRITE_ONLY_WITH_IMMEDIATE): - if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE))) - goto nack_inv; - /* consume RWQE */ - reth = &ohdr->u.rc.reth; - qp->r_len = be32_to_cpu(reth->length); - qp->r_rcv_len = 0; - qp->r_sge.sg_list = NULL; - if (qp->r_len != 0) { - u32 rkey = be32_to_cpu(reth->rkey); - u64 vaddr = be64_to_cpu(reth->vaddr); - int ok; - - /* Check rkey & NAK */ - ok = rvt_rkey_ok(qp, &qp->r_sge.sge, qp->r_len, vaddr, - rkey, IB_ACCESS_REMOTE_WRITE); - if (unlikely(!ok)) - goto nack_acc; - qp->r_sge.num_sge = 1; - } else { - qp->r_sge.num_sge = 0; - qp->r_sge.sge.mr = NULL; - qp->r_sge.sge.vaddr = NULL; - qp->r_sge.sge.length = 0; - qp->r_sge.sge.sge_length = 0; - } - if (opcode == OP(RDMA_WRITE_FIRST)) - goto send_middle; - else if (opcode == OP(RDMA_WRITE_ONLY)) - goto no_immediate_data; - ret = hfi1_rvt_get_rwqe(qp, 1); - if (ret < 0) - goto nack_op_err; - if (!ret) - goto rnr_nak; - wc.ex.imm_data = ohdr->u.rc.imm_data; - wc.wc_flags = IB_WC_WITH_IMM; - goto send_last; - - case OP(RDMA_READ_REQUEST): { - struct rvt_ack_entry *e; - u32 len; - u8 next; - - if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ))) - goto nack_inv; - next = qp->r_head_ack_queue + 1; - /* s_ack_queue is size HFI1_MAX_RDMA_ATOMIC+1 so use > not >= */ - if (next > HFI1_MAX_RDMA_ATOMIC) - next = 0; - spin_lock_irqsave(&qp->s_lock, flags); - if (unlikely(next == qp->s_tail_ack_queue)) { - if (!qp->s_ack_queue[next].sent) - goto nack_inv_unlck; - update_ack_queue(qp, next); - } - e = &qp->s_ack_queue[qp->r_head_ack_queue]; - if (e->opcode == OP(RDMA_READ_REQUEST) && e->rdma_sge.mr) { - rvt_put_mr(e->rdma_sge.mr); - e->rdma_sge.mr = NULL; - } - reth = &ohdr->u.rc.reth; - len = be32_to_cpu(reth->length); - if (len) { - u32 rkey = be32_to_cpu(reth->rkey); - u64 vaddr = be64_to_cpu(reth->vaddr); - int ok; - - /* Check rkey & NAK */ - ok = rvt_rkey_ok(qp, &e->rdma_sge, len, vaddr, - rkey, IB_ACCESS_REMOTE_READ); - if (unlikely(!ok)) - goto nack_acc_unlck; - /* - * Update the next expected PSN. We add 1 later - * below, so only add the remainder here. - */ - if (len > pmtu) - qp->r_psn += (len - 1) / pmtu; - } else { - e->rdma_sge.mr = NULL; - e->rdma_sge.vaddr = NULL; - e->rdma_sge.length = 0; - e->rdma_sge.sge_length = 0; - } - e->opcode = opcode; - e->sent = 0; - e->psn = psn; - e->lpsn = qp->r_psn; - /* - * We need to increment the MSN here instead of when we - * finish sending the result since a duplicate request would - * increment it more than once. - */ - qp->r_msn++; - qp->r_psn++; - qp->r_state = opcode; - qp->r_nak_state = 0; - qp->r_head_ack_queue = next; - - /* Schedule the send tasklet. */ - qp->s_flags |= RVT_S_RESP_PENDING; - hfi1_schedule_send(qp); - - spin_unlock_irqrestore(&qp->s_lock, flags); - if (is_fecn) - goto send_ack; - return; - } - - case OP(COMPARE_SWAP): - case OP(FETCH_ADD): { - struct ib_atomic_eth *ateth; - struct rvt_ack_entry *e; - u64 vaddr; - atomic64_t *maddr; - u64 sdata; - u32 rkey; - u8 next; - - if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC))) - goto nack_inv; - next = qp->r_head_ack_queue + 1; - if (next > HFI1_MAX_RDMA_ATOMIC) - next = 0; - spin_lock_irqsave(&qp->s_lock, flags); - if (unlikely(next == qp->s_tail_ack_queue)) { - if (!qp->s_ack_queue[next].sent) - goto nack_inv_unlck; - update_ack_queue(qp, next); - } - e = &qp->s_ack_queue[qp->r_head_ack_queue]; - if (e->opcode == OP(RDMA_READ_REQUEST) && e->rdma_sge.mr) { - rvt_put_mr(e->rdma_sge.mr); - e->rdma_sge.mr = NULL; - } - ateth = &ohdr->u.atomic_eth; - vaddr = ((u64)be32_to_cpu(ateth->vaddr[0]) << 32) | - be32_to_cpu(ateth->vaddr[1]); - if (unlikely(vaddr & (sizeof(u64) - 1))) - goto nack_inv_unlck; - rkey = be32_to_cpu(ateth->rkey); - /* Check rkey & NAK */ - if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64), - vaddr, rkey, - IB_ACCESS_REMOTE_ATOMIC))) - goto nack_acc_unlck; - /* Perform atomic OP and save result. */ - maddr = (atomic64_t *)qp->r_sge.sge.vaddr; - sdata = be64_to_cpu(ateth->swap_data); - e->atomic_data = (opcode == OP(FETCH_ADD)) ? - (u64)atomic64_add_return(sdata, maddr) - sdata : - (u64)cmpxchg((u64 *)qp->r_sge.sge.vaddr, - be64_to_cpu(ateth->compare_data), - sdata); - rvt_put_mr(qp->r_sge.sge.mr); - qp->r_sge.num_sge = 0; - e->opcode = opcode; - e->sent = 0; - e->psn = psn; - e->lpsn = psn; - qp->r_msn++; - qp->r_psn++; - qp->r_state = opcode; - qp->r_nak_state = 0; - qp->r_head_ack_queue = next; - - /* Schedule the send tasklet. */ - qp->s_flags |= RVT_S_RESP_PENDING; - hfi1_schedule_send(qp); - - spin_unlock_irqrestore(&qp->s_lock, flags); - if (is_fecn) - goto send_ack; - return; - } - - default: - /* NAK unknown opcodes. */ - goto nack_inv; - } - qp->r_psn++; - qp->r_state = opcode; - qp->r_ack_psn = psn; - qp->r_nak_state = 0; - /* Send an ACK if requested or required. */ - if (psn & IB_BTH_REQ_ACK) { - struct hfi1_qp_priv *priv = qp->priv; - - if (packet->numpkt == 0) { - rc_cancel_ack(qp); - goto send_ack; - } - if (priv->r_adefered >= HFI1_PSN_CREDIT) { - rc_cancel_ack(qp); - goto send_ack; - } - if (unlikely(is_fecn)) { - rc_cancel_ack(qp); - goto send_ack; - } - priv->r_adefered++; - rc_defered_ack(rcd, qp); - } - return; - -rnr_nak: - qp->r_nak_state = qp->r_min_rnr_timer | IB_RNR_NAK; - qp->r_ack_psn = qp->r_psn; - /* Queue RNR NAK for later */ - rc_defered_ack(rcd, qp); - return; - -nack_op_err: - hfi1_rc_error(qp, IB_WC_LOC_QP_OP_ERR); - qp->r_nak_state = IB_NAK_REMOTE_OPERATIONAL_ERROR; - qp->r_ack_psn = qp->r_psn; - /* Queue NAK for later */ - rc_defered_ack(rcd, qp); - return; - -nack_inv_unlck: - spin_unlock_irqrestore(&qp->s_lock, flags); -nack_inv: - hfi1_rc_error(qp, IB_WC_LOC_QP_OP_ERR); - qp->r_nak_state = IB_NAK_INVALID_REQUEST; - qp->r_ack_psn = qp->r_psn; - /* Queue NAK for later */ - rc_defered_ack(rcd, qp); - return; - -nack_acc_unlck: - spin_unlock_irqrestore(&qp->s_lock, flags); -nack_acc: - hfi1_rc_error(qp, IB_WC_LOC_PROT_ERR); - qp->r_nak_state = IB_NAK_REMOTE_ACCESS_ERROR; - qp->r_ack_psn = qp->r_psn; -send_ack: - hfi1_send_rc_ack(rcd, qp, is_fecn); -} - -void hfi1_rc_hdrerr( - struct hfi1_ctxtdata *rcd, - struct hfi1_ib_header *hdr, - u32 rcv_flags, - struct rvt_qp *qp) -{ - int has_grh = rcv_flags & HFI1_HAS_GRH; - struct hfi1_other_headers *ohdr; - struct hfi1_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num); - int diff; - u32 opcode; - u32 psn, bth0; - - /* Check for GRH */ - ohdr = &hdr->u.oth; - if (has_grh) - ohdr = &hdr->u.l.oth; - - bth0 = be32_to_cpu(ohdr->bth[0]); - if (hfi1_ruc_check_hdr(ibp, hdr, has_grh, qp, bth0)) - return; - - psn = be32_to_cpu(ohdr->bth[2]); - opcode = (bth0 >> 24) & 0xff; - - /* Only deal with RDMA Writes for now */ - if (opcode < IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST) { - diff = delta_psn(psn, qp->r_psn); - if (!qp->r_nak_state && diff >= 0) { - ibp->rvp.n_rc_seqnak++; - qp->r_nak_state = IB_NAK_PSN_ERROR; - /* Use the expected PSN. */ - qp->r_ack_psn = qp->r_psn; - /* - * Wait to send the sequence - * NAK until all packets - * in the receive queue have - * been processed. - * Otherwise, we end up - * propagating congestion. - */ - rc_defered_ack(rcd, qp); - } /* Out of sequence NAK */ - } /* QP Request NAKs */ -} |