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Release 4.11 drivers/infiniband/sw/rxe/rxe_comp.c

/*
 * Copyright (c) 2016 Mellanox Technologies Ltd. All rights reserved.
 * Copyright (c) 2015 System Fabric Works, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     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.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

#include <linux/skbuff.h>

#include "rxe.h"
#include "rxe_loc.h"
#include "rxe_queue.h"
#include "rxe_task.h"


enum comp_state {
	
COMPST_GET_ACK,
	
COMPST_GET_WQE,
	
COMPST_COMP_WQE,
	
COMPST_COMP_ACK,
	
COMPST_CHECK_PSN,
	
COMPST_CHECK_ACK,
	
COMPST_READ,
	
COMPST_ATOMIC,
	
COMPST_WRITE_SEND,
	
COMPST_UPDATE_COMP,
	
COMPST_ERROR_RETRY,
	
COMPST_RNR_RETRY,
	
COMPST_ERROR,
	
COMPST_EXIT, /* We have an issue, and we want to rerun the completer */
	
COMPST_DONE, /* The completer finished successflly */
};


static char *comp_state_name[] =  {
	[COMPST_GET_ACK]		= "GET ACK",
	[COMPST_GET_WQE]		= "GET WQE",
	[COMPST_COMP_WQE]		= "COMP WQE",
	[COMPST_COMP_ACK]		= "COMP ACK",
	[COMPST_CHECK_PSN]		= "CHECK PSN",
	[COMPST_CHECK_ACK]		= "CHECK ACK",
	[COMPST_READ]			= "READ",
	[COMPST_ATOMIC]			= "ATOMIC",
	[COMPST_WRITE_SEND]		= "WRITE/SEND",
	[COMPST_UPDATE_COMP]		= "UPDATE COMP",
	[COMPST_ERROR_RETRY]		= "ERROR RETRY",
	[COMPST_RNR_RETRY]		= "RNR RETRY",
	[COMPST_ERROR]			= "ERROR",
	[COMPST_EXIT]			= "EXIT",
	[COMPST_DONE]			= "DONE",
};


static unsigned long rnrnak_usec[32] = {
	[IB_RNR_TIMER_655_36] = 655360,
	[IB_RNR_TIMER_000_01] = 10,
	[IB_RNR_TIMER_000_02] = 20,
	[IB_RNR_TIMER_000_03] = 30,
	[IB_RNR_TIMER_000_04] = 40,
	[IB_RNR_TIMER_000_06] = 60,
	[IB_RNR_TIMER_000_08] = 80,
	[IB_RNR_TIMER_000_12] = 120,
	[IB_RNR_TIMER_000_16] = 160,
	[IB_RNR_TIMER_000_24] = 240,
	[IB_RNR_TIMER_000_32] = 320,
	[IB_RNR_TIMER_000_48] = 480,
	[IB_RNR_TIMER_000_64] = 640,
	[IB_RNR_TIMER_000_96] = 960,
	[IB_RNR_TIMER_001_28] = 1280,
	[IB_RNR_TIMER_001_92] = 1920,
	[IB_RNR_TIMER_002_56] = 2560,
	[IB_RNR_TIMER_003_84] = 3840,
	[IB_RNR_TIMER_005_12] = 5120,
	[IB_RNR_TIMER_007_68] = 7680,
	[IB_RNR_TIMER_010_24] = 10240,
	[IB_RNR_TIMER_015_36] = 15360,
	[IB_RNR_TIMER_020_48] = 20480,
	[IB_RNR_TIMER_030_72] = 30720,
	[IB_RNR_TIMER_040_96] = 40960,
	[IB_RNR_TIMER_061_44] = 61410,
	[IB_RNR_TIMER_081_92] = 81920,
	[IB_RNR_TIMER_122_88] = 122880,
	[IB_RNR_TIMER_163_84] = 163840,
	[IB_RNR_TIMER_245_76] = 245760,
	[IB_RNR_TIMER_327_68] = 327680,
	[IB_RNR_TIMER_491_52] = 491520,
};


static inline unsigned long rnrnak_jiffies(u8 timeout) { return max_t(unsigned long, usecs_to_jiffies(rnrnak_usec[timeout]), 1); }

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static enum ib_wc_opcode wr_to_wc_opcode(enum ib_wr_opcode opcode) { switch (opcode) { case IB_WR_RDMA_WRITE: return IB_WC_RDMA_WRITE; case IB_WR_RDMA_WRITE_WITH_IMM: return IB_WC_RDMA_WRITE; case IB_WR_SEND: return IB_WC_SEND; case IB_WR_SEND_WITH_IMM: return IB_WC_SEND; case IB_WR_RDMA_READ: return IB_WC_RDMA_READ; case IB_WR_ATOMIC_CMP_AND_SWP: return IB_WC_COMP_SWAP; case IB_WR_ATOMIC_FETCH_AND_ADD: return IB_WC_FETCH_ADD; case IB_WR_LSO: return IB_WC_LSO; case IB_WR_SEND_WITH_INV: return IB_WC_SEND; case IB_WR_RDMA_READ_WITH_INV: return IB_WC_RDMA_READ; case IB_WR_LOCAL_INV: return IB_WC_LOCAL_INV; case IB_WR_REG_MR: return IB_WC_REG_MR; default: return 0xff; } }

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void retransmit_timer(unsigned long data) { struct rxe_qp *qp = (struct rxe_qp *)data; if (qp->valid) { qp->comp.timeout = 1; rxe_run_task(&qp->comp.task, 1); } }

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void rxe_comp_queue_pkt(struct rxe_dev *rxe, struct rxe_qp *qp, struct sk_buff *skb) { int must_sched; skb_queue_tail(&qp->resp_pkts, skb); must_sched = skb_queue_len(&qp->resp_pkts) > 1; rxe_run_task(&qp->comp.task, must_sched); }

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static inline enum comp_state get_wqe(struct rxe_qp *qp, struct rxe_pkt_info *pkt, struct rxe_send_wqe **wqe_p) { struct rxe_send_wqe *wqe; /* we come here whether or not we found a response packet to see if * there are any posted WQEs */ wqe = queue_head(qp->sq.queue); *wqe_p = wqe; /* no WQE or requester has not started it yet */ if (!wqe || wqe->state == wqe_state_posted) return pkt ? COMPST_DONE : COMPST_EXIT; /* WQE does not require an ack */ if (wqe->state == wqe_state_done) return COMPST_COMP_WQE; /* WQE caused an error */ if (wqe->state == wqe_state_error) return COMPST_ERROR; /* we have a WQE, if we also have an ack check its PSN */ return pkt ? COMPST_CHECK_PSN : COMPST_EXIT; }

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static inline void reset_retry_counters(struct rxe_qp *qp) { qp->comp.retry_cnt = qp->attr.retry_cnt; qp->comp.rnr_retry = qp->attr.rnr_retry; }

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static inline enum comp_state check_psn(struct rxe_qp *qp, struct rxe_pkt_info *pkt, struct rxe_send_wqe *wqe) { s32 diff; /* check to see if response is past the oldest WQE. if it is, complete * send/write or error read/atomic */ diff = psn_compare(pkt->psn, wqe->last_psn); if (diff > 0) { if (wqe->state == wqe_state_pending) { if (wqe->mask & WR_ATOMIC_OR_READ_MASK) return COMPST_ERROR_RETRY; reset_retry_counters(qp); return COMPST_COMP_WQE; } else { return COMPST_DONE; } } /* compare response packet to expected response */ diff = psn_compare(pkt->psn, qp->comp.psn); if (diff < 0) { /* response is most likely a retried packet if it matches an * uncompleted WQE go complete it else ignore it */ if (pkt->psn == wqe->last_psn) return COMPST_COMP_ACK; else return COMPST_DONE; } else if ((diff > 0) && (wqe->mask & WR_ATOMIC_OR_READ_MASK)) { return COMPST_DONE; } else { return COMPST_CHECK_ACK; } }

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static inline enum comp_state check_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, struct rxe_send_wqe *wqe) { unsigned int mask = pkt->mask; u8 syn; /* Check the sequence only */ switch (qp->comp.opcode) { case -1: /* Will catch all *_ONLY cases. */ if (!(mask & RXE_START_MASK)) return COMPST_ERROR; break; case IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST: case IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE: if (pkt->opcode != IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE && pkt->opcode != IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST) { return COMPST_ERROR; } break; default: WARN_ON_ONCE(1); } /* Check operation validity. */ switch (pkt->opcode) { case IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST: case IB_OPCODE_RC_RDMA_READ_RESPONSE_LAST: case IB_OPCODE_RC_RDMA_READ_RESPONSE_ONLY: syn = aeth_syn(pkt); if ((syn & AETH_TYPE_MASK) != AETH_ACK) return COMPST_ERROR; /* Fall through (IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE * doesn't have an AETH) */ case IB_OPCODE_RC_RDMA_READ_RESPONSE_MIDDLE: if (wqe->wr.opcode != IB_WR_RDMA_READ && wqe->wr.opcode != IB_WR_RDMA_READ_WITH_INV) { return COMPST_ERROR; } reset_retry_counters(qp); return COMPST_READ; case IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE: syn = aeth_syn(pkt); if ((syn & AETH_TYPE_MASK) != AETH_ACK) return COMPST_ERROR; if (wqe->wr.opcode != IB_WR_ATOMIC_CMP_AND_SWP && wqe->wr.opcode != IB_WR_ATOMIC_FETCH_AND_ADD) return COMPST_ERROR; reset_retry_counters(qp); return COMPST_ATOMIC; case IB_OPCODE_RC_ACKNOWLEDGE: syn = aeth_syn(pkt); switch (syn & AETH_TYPE_MASK) { case AETH_ACK: reset_retry_counters(qp); return COMPST_WRITE_SEND; case AETH_RNR_NAK: return COMPST_RNR_RETRY; case AETH_NAK: switch (syn) { case AETH_NAK_PSN_SEQ_ERROR: /* a nak implicitly acks all packets with psns * before */ if (psn_compare(pkt->psn, qp->comp.psn) > 0) { qp->comp.psn = pkt->psn; if (qp->req.wait_psn) { qp->req.wait_psn = 0; rxe_run_task(&qp->req.task, 1); } } return COMPST_ERROR_RETRY; case AETH_NAK_INVALID_REQ: wqe->status = IB_WC_REM_INV_REQ_ERR; return COMPST_ERROR; case AETH_NAK_REM_ACC_ERR: wqe->status = IB_WC_REM_ACCESS_ERR; return COMPST_ERROR; case AETH_NAK_REM_OP_ERR: wqe->status = IB_WC_REM_OP_ERR; return COMPST_ERROR; default: pr_warn("unexpected nak %x\n", syn); wqe->status = IB_WC_REM_OP_ERR; return COMPST_ERROR; } default: return COMPST_ERROR; } break; default: pr_warn("unexpected opcode\n"); } return COMPST_ERROR; }

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static inline enum comp_state do_read(struct rxe_qp *qp, struct rxe_pkt_info *pkt, struct rxe_send_wqe *wqe) { struct rxe_dev *rxe = to_rdev(qp->ibqp.device); int ret; ret = copy_data(rxe, qp->pd, IB_ACCESS_LOCAL_WRITE, &wqe->dma, payload_addr(pkt), payload_size(pkt), to_mem_obj, NULL); if (ret) return COMPST_ERROR; if (wqe->dma.resid == 0 && (pkt->mask & RXE_END_MASK)) return COMPST_COMP_ACK; else return COMPST_UPDATE_COMP; }

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static inline enum comp_state do_atomic(struct rxe_qp *qp, struct rxe_pkt_info *pkt, struct rxe_send_wqe *wqe) { struct rxe_dev *rxe = to_rdev(qp->ibqp.device); int ret; u64 atomic_orig = atmack_orig(pkt); ret = copy_data(rxe, qp->pd, IB_ACCESS_LOCAL_WRITE, &wqe->dma, &atomic_orig, sizeof(u64), to_mem_obj, NULL); if (ret) return COMPST_ERROR; else return COMPST_COMP_ACK; }

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static void make_send_cqe(struct rxe_qp *qp, struct rxe_send_wqe *wqe, struct rxe_cqe *cqe) { memset(cqe, 0, sizeof(*cqe)); if (!qp->is_user) { struct ib_wc *wc = &cqe->ibwc; wc->wr_id = wqe->wr.wr_id; wc->status = wqe->status; wc->opcode = wr_to_wc_opcode(wqe->wr.opcode); if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM || wqe->wr.opcode == IB_WR_SEND_WITH_IMM) wc->wc_flags = IB_WC_WITH_IMM; wc->byte_len = wqe->dma.length; wc->qp = &qp->ibqp; } else { struct ib_uverbs_wc *uwc = &cqe->uibwc; uwc->wr_id = wqe->wr.wr_id; uwc->status = wqe->status; uwc->opcode = wr_to_wc_opcode(wqe->wr.opcode); if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM || wqe->wr.opcode == IB_WR_SEND_WITH_IMM) uwc->wc_flags = IB_WC_WITH_IMM; uwc->byte_len = wqe->dma.length; uwc->qp_num = qp->ibqp.qp_num; } }

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/* * IBA Spec. Section 10.7.3.1 SIGNALED COMPLETIONS * ---------8<---------8<------------- * ...Note that if a completion error occurs, a Work Completion * will always be generated, even if the signaling * indicator requests an Unsignaled Completion. * ---------8<---------8<------------- */
static void do_complete(struct rxe_qp *qp, struct rxe_send_wqe *wqe) { struct rxe_cqe cqe; if ((qp->sq_sig_type == IB_SIGNAL_ALL_WR) || (wqe->wr.send_flags & IB_SEND_SIGNALED) || wqe->status != IB_WC_SUCCESS) { make_send_cqe(qp, wqe, &cqe); advance_consumer(qp->sq.queue); rxe_cq_post(qp->scq, &cqe, 0); } else { advance_consumer(qp->sq.queue); } /* * we completed something so let req run again * if it is trying to fence */ if (qp->req.wait_fence) { qp->req.wait_fence = 0; rxe_run_task(&qp->req.task, 1); } }

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static inline enum comp_state complete_ack(struct rxe_qp *qp, struct rxe_pkt_info *pkt, struct rxe_send_wqe *wqe) { unsigned long flags; if (wqe->has_rd_atomic) { wqe->has_rd_atomic = 0; atomic_inc(&qp->req.rd_atomic); if (qp->req.need_rd_atomic) { qp->comp.timeout_retry = 0; qp->req.need_rd_atomic = 0; rxe_run_task(&qp->req.task, 1); } } if (unlikely(qp->req.state == QP_STATE_DRAIN)) { /* state_lock used by requester & completer */ spin_lock_irqsave(&qp->state_lock, flags); if ((qp->req.state == QP_STATE_DRAIN) && (qp->comp.psn == qp->req.psn)) { qp->req.state = QP_STATE_DRAINED; spin_unlock_irqrestore(&qp->state_lock, flags); if (qp->ibqp.event_handler) { struct ib_event ev; ev.device = qp->ibqp.device; ev.element.qp = &qp->ibqp; ev.event = IB_EVENT_SQ_DRAINED; qp->ibqp.event_handler(&ev, qp->ibqp.qp_context); } } else { spin_unlock_irqrestore(&qp->state_lock, flags); } } do_complete(qp, wqe); if (psn_compare(pkt->psn, qp->comp.psn) >= 0) return COMPST_UPDATE_COMP; else return COMPST_DONE; }

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static inline enum comp_state complete_wqe(struct rxe_qp *qp, struct rxe_pkt_info *pkt, struct rxe_send_wqe *wqe) { qp->comp.opcode = -1; if (pkt) { if (psn_compare(pkt->psn, qp->comp.psn) >= 0) qp->comp.psn = (pkt->psn + 1) & BTH_PSN_MASK; if (qp->req.wait_psn) { qp->req.wait_psn = 0; rxe_run_task(&qp->req.task, 1); } } do_complete(qp, wqe); return COMPST_GET_WQE; }

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static void rxe_drain_resp_pkts(struct rxe_qp *qp, bool notify) { struct sk_buff *skb; struct rxe_send_wqe *wqe; while ((skb = skb_dequeue(&qp->resp_pkts))) { rxe_drop_ref(qp); kfree_skb(skb); } while ((wqe = queue_head(qp->sq.queue))) { if (notify) { wqe->status = IB_WC_WR_FLUSH_ERR; do_complete(qp, wqe); } else { advance_consumer(qp->sq.queue); } } }

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int rxe_completer(void *arg) { struct rxe_qp *qp = (struct rxe_qp *)arg; struct rxe_send_wqe *wqe = wqe; struct sk_buff *skb = NULL; struct rxe_pkt_info *pkt = NULL; enum comp_state state; rxe_add_ref(qp); if (!qp->valid || qp->req.state == QP_STATE_ERROR || qp->req.state == QP_STATE_RESET) { rxe_drain_resp_pkts(qp, qp->valid && qp->req.state == QP_STATE_ERROR); goto exit; } if (qp->comp.timeout) { qp->comp.timeout_retry = 1; qp->comp.timeout = 0; } else { qp->comp.timeout_retry = 0; } if (qp->req.need_retry) goto exit; state = COMPST_GET_ACK; while (1) { pr_debug("qp#%d state = %s\n", qp_num(qp), comp_state_name[state]); switch (state) { case COMPST_GET_ACK: skb = skb_dequeue(&qp->resp_pkts); if (skb) { pkt = SKB_TO_PKT(skb); qp->comp.timeout_retry = 0; } state = COMPST_GET_WQE; break; case COMPST_GET_WQE: state = get_wqe(qp, pkt, &wqe); break; case COMPST_CHECK_PSN: state = check_psn(qp, pkt, wqe); break; case COMPST_CHECK_ACK: state = check_ack(qp, pkt, wqe); break; case COMPST_READ: state = do_read(qp, pkt, wqe); break; case COMPST_ATOMIC: state = do_atomic(qp, pkt, wqe); break; case COMPST_WRITE_SEND: if (wqe->state == wqe_state_pending && wqe->last_psn == pkt->psn) state = COMPST_COMP_ACK; else state = COMPST_UPDATE_COMP; break; case COMPST_COMP_ACK: state = complete_ack(qp, pkt, wqe); break; case COMPST_COMP_WQE: state = complete_wqe(qp, pkt, wqe); break; case COMPST_UPDATE_COMP: if (pkt->mask & RXE_END_MASK) qp->comp.opcode = -1; else qp->comp.opcode = pkt->opcode; if (psn_compare(pkt->psn, qp->comp.psn) >= 0) qp->comp.psn = (pkt->psn + 1) & BTH_PSN_MASK; if (qp->req.wait_psn) { qp->req.wait_psn = 0; rxe_run_task(&qp->req.task, 1); } state = COMPST_DONE; break; case COMPST_DONE: if (pkt) { rxe_drop_ref(pkt->qp); kfree_skb(skb); skb = NULL; } goto done; case COMPST_EXIT: if (qp->comp.timeout_retry && wqe) { state = COMPST_ERROR_RETRY; break; } /* re reset the timeout counter if * (1) QP is type RC * (2) the QP is alive * (3) there is a packet sent by the requester that * might be acked (we still might get spurious * timeouts but try to keep them as few as possible) * (4) the timeout parameter is set */ if ((qp_type(qp) == IB_QPT_RC) && (qp->req.state == QP_STATE_READY) && (psn_compare(qp->req.psn, qp->comp.psn) > 0) && qp->qp_timeout_jiffies) mod_timer(&qp->retrans_timer, jiffies + qp->qp_timeout_jiffies); WARN_ON_ONCE(skb); goto exit; case COMPST_ERROR_RETRY: /* we come here if the retry timer fired and we did * not receive a response packet. try to retry the send * queue if that makes sense and the limits have not * been exceeded. remember that some timeouts are * spurious since we do not reset the timer but kick * it down the road or let it expire */ /* there is nothing to retry in this case */ if (!wqe || (wqe->state == wqe_state_posted)) { WARN_ON_ONCE(skb); goto exit; } if (qp->comp.retry_cnt > 0) { if (qp->comp.retry_cnt != 7) qp->comp.retry_cnt--; /* no point in retrying if we have already * seen the last ack that the requester could * have caused */ if (psn_compare(qp->req.psn, qp->comp.psn) > 0) { /* tell the requester to retry the * send send queue next time around */ qp->req.need_retry = 1; rxe_run_task(&qp->req.task, 1); } if (pkt) { rxe_drop_ref(pkt->qp); kfree_skb(skb); skb = NULL; } WARN_ON_ONCE(skb); goto exit; } else { wqe->status = IB_WC_RETRY_EXC_ERR; state = COMPST_ERROR; } break; case COMPST_RNR_RETRY: if (qp->comp.rnr_retry > 0) { if (qp->comp.rnr_retry != 7) qp->comp.rnr_retry--; qp->req.need_retry = 1; pr_debug("qp#%d set rnr nak timer\n", qp_num(qp)); mod_timer(&qp->rnr_nak_timer, jiffies + rnrnak_jiffies(aeth_syn(pkt) & ~AETH_TYPE_MASK)); rxe_drop_ref(pkt->qp); kfree_skb(skb); skb = NULL; goto exit; } else { wqe->status = IB_WC_RNR_RETRY_EXC_ERR; state = COMPST_ERROR; } break; case COMPST_ERROR: WARN_ON_ONCE(wqe->status == IB_WC_SUCCESS); do_complete(qp, wqe); rxe_qp_error(qp); if (pkt) { rxe_drop_ref(pkt->qp); kfree_skb(skb); skb = NULL; } WARN_ON_ONCE(skb); goto exit; } } exit: /* we come here if we are done with processing and want the task to * exit from the loop calling us */ WARN_ON_ONCE(skb); rxe_drop_ref(qp); return -EAGAIN; done: /* we come here if we have processed a packet we want the task to call * us again to see if there is anything else to do */ WARN_ON_ONCE(skb); rxe_drop_ref(qp); return 0; }

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