| /* |
| * Copyright (c) 2006, 2007 QLogic Corporation. All rights reserved. |
| * Copyright (c) 2005, 2006 PathScale, 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/spinlock.h> |
| |
| #include "ipath_verbs.h" |
| #include "ipath_kernel.h" |
| |
| /* |
| * Convert the AETH RNR timeout code into the number of milliseconds. |
| */ |
| const u32 ib_ipath_rnr_table[32] = { |
| 656, /* 0 */ |
| 1, /* 1 */ |
| 1, /* 2 */ |
| 1, /* 3 */ |
| 1, /* 4 */ |
| 1, /* 5 */ |
| 1, /* 6 */ |
| 1, /* 7 */ |
| 1, /* 8 */ |
| 1, /* 9 */ |
| 1, /* A */ |
| 1, /* B */ |
| 1, /* C */ |
| 1, /* D */ |
| 2, /* E */ |
| 2, /* F */ |
| 3, /* 10 */ |
| 4, /* 11 */ |
| 6, /* 12 */ |
| 8, /* 13 */ |
| 11, /* 14 */ |
| 16, /* 15 */ |
| 21, /* 16 */ |
| 31, /* 17 */ |
| 41, /* 18 */ |
| 62, /* 19 */ |
| 82, /* 1A */ |
| 123, /* 1B */ |
| 164, /* 1C */ |
| 246, /* 1D */ |
| 328, /* 1E */ |
| 492 /* 1F */ |
| }; |
| |
| /** |
| * ipath_insert_rnr_queue - put QP on the RNR timeout list for the device |
| * @qp: the QP |
| * |
| * XXX Use a simple list for now. We might need a priority |
| * queue if we have lots of QPs waiting for RNR timeouts |
| * but that should be rare. |
| */ |
| void ipath_insert_rnr_queue(struct ipath_qp *qp) |
| { |
| struct ipath_ibdev *dev = to_idev(qp->ibqp.device); |
| unsigned long flags; |
| |
| spin_lock_irqsave(&dev->pending_lock, flags); |
| if (list_empty(&dev->rnrwait)) |
| list_add(&qp->timerwait, &dev->rnrwait); |
| else { |
| struct list_head *l = &dev->rnrwait; |
| struct ipath_qp *nqp = list_entry(l->next, struct ipath_qp, |
| timerwait); |
| |
| while (qp->s_rnr_timeout >= nqp->s_rnr_timeout) { |
| qp->s_rnr_timeout -= nqp->s_rnr_timeout; |
| l = l->next; |
| if (l->next == &dev->rnrwait) { |
| nqp = NULL; |
| break; |
| } |
| nqp = list_entry(l->next, struct ipath_qp, |
| timerwait); |
| } |
| if (nqp) |
| nqp->s_rnr_timeout -= qp->s_rnr_timeout; |
| list_add(&qp->timerwait, l); |
| } |
| spin_unlock_irqrestore(&dev->pending_lock, flags); |
| } |
| |
| /** |
| * ipath_init_sge - Validate a RWQE and fill in the SGE state |
| * @qp: the QP |
| * |
| * Return 1 if OK. |
| */ |
| int ipath_init_sge(struct ipath_qp *qp, struct ipath_rwqe *wqe, |
| u32 *lengthp, struct ipath_sge_state *ss) |
| { |
| int i, j, ret; |
| struct ib_wc wc; |
| |
| *lengthp = 0; |
| for (i = j = 0; i < wqe->num_sge; i++) { |
| if (wqe->sg_list[i].length == 0) |
| continue; |
| /* Check LKEY */ |
| if (!ipath_lkey_ok(qp, j ? &ss->sg_list[j - 1] : &ss->sge, |
| &wqe->sg_list[i], IB_ACCESS_LOCAL_WRITE)) |
| goto bad_lkey; |
| *lengthp += wqe->sg_list[i].length; |
| j++; |
| } |
| ss->num_sge = j; |
| ret = 1; |
| goto bail; |
| |
| bad_lkey: |
| wc.wr_id = wqe->wr_id; |
| wc.status = IB_WC_LOC_PROT_ERR; |
| wc.opcode = IB_WC_RECV; |
| wc.vendor_err = 0; |
| wc.byte_len = 0; |
| wc.imm_data = 0; |
| wc.qp = &qp->ibqp; |
| wc.src_qp = 0; |
| wc.wc_flags = 0; |
| wc.pkey_index = 0; |
| wc.slid = 0; |
| wc.sl = 0; |
| wc.dlid_path_bits = 0; |
| wc.port_num = 0; |
| /* Signal solicited completion event. */ |
| ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1); |
| ret = 0; |
| bail: |
| return ret; |
| } |
| |
| /** |
| * ipath_get_rwqe - copy the next RWQE into the QP's RWQE |
| * @qp: the QP |
| * @wr_id_only: update wr_id only, not SGEs |
| * |
| * Return 0 if no RWQE is available, otherwise return 1. |
| * |
| * Can be called from interrupt level. |
| */ |
| int ipath_get_rwqe(struct ipath_qp *qp, int wr_id_only) |
| { |
| unsigned long flags; |
| struct ipath_rq *rq; |
| struct ipath_rwq *wq; |
| struct ipath_srq *srq; |
| struct ipath_rwqe *wqe; |
| void (*handler)(struct ib_event *, void *); |
| u32 tail; |
| int ret; |
| |
| qp->r_sge.sg_list = qp->r_sg_list; |
| |
| if (qp->ibqp.srq) { |
| srq = to_isrq(qp->ibqp.srq); |
| handler = srq->ibsrq.event_handler; |
| rq = &srq->rq; |
| } else { |
| srq = NULL; |
| handler = NULL; |
| rq = &qp->r_rq; |
| } |
| |
| spin_lock_irqsave(&rq->lock, flags); |
| wq = rq->wq; |
| tail = wq->tail; |
| /* Validate tail before using it since it is user writable. */ |
| if (tail >= rq->size) |
| tail = 0; |
| do { |
| if (unlikely(tail == wq->head)) { |
| spin_unlock_irqrestore(&rq->lock, flags); |
| ret = 0; |
| goto bail; |
| } |
| /* Make sure entry is read after head index is read. */ |
| smp_rmb(); |
| wqe = get_rwqe_ptr(rq, tail); |
| if (++tail >= rq->size) |
| tail = 0; |
| } while (!wr_id_only && !ipath_init_sge(qp, wqe, &qp->r_len, |
| &qp->r_sge)); |
| qp->r_wr_id = wqe->wr_id; |
| wq->tail = tail; |
| |
| ret = 1; |
| qp->r_wrid_valid = 1; |
| if (handler) { |
| u32 n; |
| |
| /* |
| * validate head pointer value and compute |
| * the number of remaining WQEs. |
| */ |
| n = wq->head; |
| if (n >= rq->size) |
| n = 0; |
| if (n < tail) |
| n += rq->size - tail; |
| else |
| n -= tail; |
| if (n < srq->limit) { |
| struct ib_event ev; |
| |
| srq->limit = 0; |
| spin_unlock_irqrestore(&rq->lock, flags); |
| ev.device = qp->ibqp.device; |
| ev.element.srq = qp->ibqp.srq; |
| ev.event = IB_EVENT_SRQ_LIMIT_REACHED; |
| handler(&ev, srq->ibsrq.srq_context); |
| goto bail; |
| } |
| } |
| spin_unlock_irqrestore(&rq->lock, flags); |
| |
| bail: |
| return ret; |
| } |
| |
| /** |
| * ipath_ruc_loopback - handle UC and RC lookback requests |
| * @sqp: the sending QP |
| * |
| * This is called from ipath_do_send() to |
| * forward a WQE addressed to the same HCA. |
| * Note that although we are single threaded due to the tasklet, we still |
| * have to protect against post_send(). We don't have to worry about |
| * receive interrupts since this is a connected protocol and all packets |
| * will pass through here. |
| */ |
| static void ipath_ruc_loopback(struct ipath_qp *sqp) |
| { |
| struct ipath_ibdev *dev = to_idev(sqp->ibqp.device); |
| struct ipath_qp *qp; |
| struct ipath_swqe *wqe; |
| struct ipath_sge *sge; |
| unsigned long flags; |
| struct ib_wc wc; |
| u64 sdata; |
| atomic64_t *maddr; |
| |
| qp = ipath_lookup_qpn(&dev->qp_table, sqp->remote_qpn); |
| if (!qp) { |
| dev->n_pkt_drops++; |
| return; |
| } |
| |
| again: |
| spin_lock_irqsave(&sqp->s_lock, flags); |
| |
| if (!(ib_ipath_state_ops[sqp->state] & IPATH_PROCESS_SEND_OK) || |
| sqp->s_rnr_timeout) { |
| spin_unlock_irqrestore(&sqp->s_lock, flags); |
| goto done; |
| } |
| |
| /* Get the next send request. */ |
| if (sqp->s_last == sqp->s_head) { |
| /* Send work queue is empty. */ |
| spin_unlock_irqrestore(&sqp->s_lock, flags); |
| goto done; |
| } |
| |
| /* |
| * We can rely on the entry not changing without the s_lock |
| * being held until we update s_last. |
| */ |
| wqe = get_swqe_ptr(sqp, sqp->s_last); |
| spin_unlock_irqrestore(&sqp->s_lock, flags); |
| |
| wc.wc_flags = 0; |
| wc.imm_data = 0; |
| |
| sqp->s_sge.sge = wqe->sg_list[0]; |
| sqp->s_sge.sg_list = wqe->sg_list + 1; |
| sqp->s_sge.num_sge = wqe->wr.num_sge; |
| sqp->s_len = wqe->length; |
| switch (wqe->wr.opcode) { |
| case IB_WR_SEND_WITH_IMM: |
| wc.wc_flags = IB_WC_WITH_IMM; |
| wc.imm_data = wqe->wr.imm_data; |
| /* FALLTHROUGH */ |
| case IB_WR_SEND: |
| if (!ipath_get_rwqe(qp, 0)) { |
| rnr_nak: |
| /* Handle RNR NAK */ |
| if (qp->ibqp.qp_type == IB_QPT_UC) |
| goto send_comp; |
| if (sqp->s_rnr_retry == 0) { |
| wc.status = IB_WC_RNR_RETRY_EXC_ERR; |
| goto err; |
| } |
| if (sqp->s_rnr_retry_cnt < 7) |
| sqp->s_rnr_retry--; |
| dev->n_rnr_naks++; |
| sqp->s_rnr_timeout = |
| ib_ipath_rnr_table[qp->r_min_rnr_timer]; |
| ipath_insert_rnr_queue(sqp); |
| goto done; |
| } |
| break; |
| |
| case IB_WR_RDMA_WRITE_WITH_IMM: |
| if (unlikely(!(qp->qp_access_flags & |
| IB_ACCESS_REMOTE_WRITE))) { |
| wc.status = IB_WC_REM_INV_REQ_ERR; |
| goto err; |
| } |
| wc.wc_flags = IB_WC_WITH_IMM; |
| wc.imm_data = wqe->wr.imm_data; |
| if (!ipath_get_rwqe(qp, 1)) |
| goto rnr_nak; |
| /* FALLTHROUGH */ |
| case IB_WR_RDMA_WRITE: |
| if (unlikely(!(qp->qp_access_flags & |
| IB_ACCESS_REMOTE_WRITE))) { |
| wc.status = IB_WC_REM_INV_REQ_ERR; |
| goto err; |
| } |
| if (wqe->length == 0) |
| break; |
| if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, wqe->length, |
| wqe->wr.wr.rdma.remote_addr, |
| wqe->wr.wr.rdma.rkey, |
| IB_ACCESS_REMOTE_WRITE))) { |
| acc_err: |
| wc.status = IB_WC_REM_ACCESS_ERR; |
| err: |
| wc.wr_id = wqe->wr.wr_id; |
| wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode]; |
| wc.vendor_err = 0; |
| wc.byte_len = 0; |
| wc.qp = &sqp->ibqp; |
| wc.src_qp = sqp->remote_qpn; |
| wc.pkey_index = 0; |
| wc.slid = sqp->remote_ah_attr.dlid; |
| wc.sl = sqp->remote_ah_attr.sl; |
| wc.dlid_path_bits = 0; |
| wc.port_num = 0; |
| spin_lock_irqsave(&sqp->s_lock, flags); |
| ipath_sqerror_qp(sqp, &wc); |
| spin_unlock_irqrestore(&sqp->s_lock, flags); |
| goto done; |
| } |
| break; |
| |
| case IB_WR_RDMA_READ: |
| if (unlikely(!(qp->qp_access_flags & |
| IB_ACCESS_REMOTE_READ))) { |
| wc.status = IB_WC_REM_INV_REQ_ERR; |
| goto err; |
| } |
| if (unlikely(!ipath_rkey_ok(qp, &sqp->s_sge, wqe->length, |
| wqe->wr.wr.rdma.remote_addr, |
| wqe->wr.wr.rdma.rkey, |
| IB_ACCESS_REMOTE_READ))) |
| goto acc_err; |
| qp->r_sge.sge = wqe->sg_list[0]; |
| qp->r_sge.sg_list = wqe->sg_list + 1; |
| qp->r_sge.num_sge = wqe->wr.num_sge; |
| break; |
| |
| case IB_WR_ATOMIC_CMP_AND_SWP: |
| case IB_WR_ATOMIC_FETCH_AND_ADD: |
| if (unlikely(!(qp->qp_access_flags & |
| IB_ACCESS_REMOTE_ATOMIC))) { |
| wc.status = IB_WC_REM_INV_REQ_ERR; |
| goto err; |
| } |
| if (unlikely(!ipath_rkey_ok(qp, &qp->r_sge, sizeof(u64), |
| wqe->wr.wr.atomic.remote_addr, |
| wqe->wr.wr.atomic.rkey, |
| IB_ACCESS_REMOTE_ATOMIC))) |
| goto acc_err; |
| /* Perform atomic OP and save result. */ |
| maddr = (atomic64_t *) qp->r_sge.sge.vaddr; |
| sdata = wqe->wr.wr.atomic.compare_add; |
| *(u64 *) sqp->s_sge.sge.vaddr = |
| (wqe->wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ? |
| (u64) atomic64_add_return(sdata, maddr) - sdata : |
| (u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr, |
| sdata, wqe->wr.wr.atomic.swap); |
| goto send_comp; |
| |
| default: |
| goto done; |
| } |
| |
| sge = &sqp->s_sge.sge; |
| while (sqp->s_len) { |
| u32 len = sqp->s_len; |
| |
| if (len > sge->length) |
| len = sge->length; |
| if (len > sge->sge_length) |
| len = sge->sge_length; |
| BUG_ON(len == 0); |
| ipath_copy_sge(&qp->r_sge, sge->vaddr, len); |
| sge->vaddr += len; |
| sge->length -= len; |
| sge->sge_length -= len; |
| if (sge->sge_length == 0) { |
| if (--sqp->s_sge.num_sge) |
| *sge = *sqp->s_sge.sg_list++; |
| } else if (sge->length == 0 && sge->mr != NULL) { |
| if (++sge->n >= IPATH_SEGSZ) { |
| if (++sge->m >= sge->mr->mapsz) |
| break; |
| sge->n = 0; |
| } |
| sge->vaddr = |
| sge->mr->map[sge->m]->segs[sge->n].vaddr; |
| sge->length = |
| sge->mr->map[sge->m]->segs[sge->n].length; |
| } |
| sqp->s_len -= len; |
| } |
| |
| if (wqe->wr.opcode == IB_WR_RDMA_WRITE || |
| wqe->wr.opcode == IB_WR_RDMA_READ) |
| goto send_comp; |
| |
| if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM) |
| wc.opcode = IB_WC_RECV_RDMA_WITH_IMM; |
| else |
| wc.opcode = IB_WC_RECV; |
| wc.wr_id = qp->r_wr_id; |
| wc.status = IB_WC_SUCCESS; |
| wc.vendor_err = 0; |
| wc.byte_len = wqe->length; |
| wc.qp = &qp->ibqp; |
| wc.src_qp = qp->remote_qpn; |
| wc.pkey_index = 0; |
| wc.slid = qp->remote_ah_attr.dlid; |
| wc.sl = qp->remote_ah_attr.sl; |
| wc.dlid_path_bits = 0; |
| wc.port_num = 1; |
| /* Signal completion event if the solicited bit is set. */ |
| ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, |
| wqe->wr.send_flags & IB_SEND_SOLICITED); |
| |
| send_comp: |
| sqp->s_rnr_retry = sqp->s_rnr_retry_cnt; |
| ipath_send_complete(sqp, wqe, IB_WC_SUCCESS); |
| goto again; |
| |
| done: |
| if (atomic_dec_and_test(&qp->refcount)) |
| wake_up(&qp->wait); |
| } |
| |
| static void want_buffer(struct ipath_devdata *dd) |
| { |
| if (!(dd->ipath_flags & IPATH_HAS_SEND_DMA)) { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&dd->ipath_sendctrl_lock, flags); |
| dd->ipath_sendctrl |= INFINIPATH_S_PIOINTBUFAVAIL; |
| ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl, |
| dd->ipath_sendctrl); |
| ipath_read_kreg64(dd, dd->ipath_kregs->kr_scratch); |
| spin_unlock_irqrestore(&dd->ipath_sendctrl_lock, flags); |
| } |
| } |
| |
| /** |
| * ipath_no_bufs_available - tell the layer driver we need buffers |
| * @qp: the QP that caused the problem |
| * @dev: the device we ran out of buffers on |
| * |
| * Called when we run out of PIO buffers. |
| */ |
| static void ipath_no_bufs_available(struct ipath_qp *qp, |
| struct ipath_ibdev *dev) |
| { |
| unsigned long flags; |
| |
| /* |
| * Note that as soon as want_buffer() is called and |
| * possibly before it returns, ipath_ib_piobufavail() |
| * could be called. If we are still in the tasklet function, |
| * tasklet_hi_schedule() will not call us until the next time |
| * tasklet_hi_schedule() is called. |
| * We leave the busy flag set so that another post send doesn't |
| * try to put the same QP on the piowait list again. |
| */ |
| spin_lock_irqsave(&dev->pending_lock, flags); |
| list_add_tail(&qp->piowait, &dev->piowait); |
| spin_unlock_irqrestore(&dev->pending_lock, flags); |
| want_buffer(dev->dd); |
| dev->n_piowait++; |
| } |
| |
| /** |
| * ipath_make_grh - construct a GRH header |
| * @dev: a pointer to the ipath device |
| * @hdr: a pointer to the GRH header being constructed |
| * @grh: the global route address to send to |
| * @hwords: the number of 32 bit words of header being sent |
| * @nwords: the number of 32 bit words of data being sent |
| * |
| * Return the size of the header in 32 bit words. |
| */ |
| u32 ipath_make_grh(struct ipath_ibdev *dev, struct ib_grh *hdr, |
| struct ib_global_route *grh, u32 hwords, u32 nwords) |
| { |
| hdr->version_tclass_flow = |
| cpu_to_be32((6 << 28) | |
| (grh->traffic_class << 20) | |
| grh->flow_label); |
| hdr->paylen = cpu_to_be16((hwords - 2 + nwords + SIZE_OF_CRC) << 2); |
| /* next_hdr is defined by C8-7 in ch. 8.4.1 */ |
| hdr->next_hdr = 0x1B; |
| hdr->hop_limit = grh->hop_limit; |
| /* The SGID is 32-bit aligned. */ |
| hdr->sgid.global.subnet_prefix = dev->gid_prefix; |
| hdr->sgid.global.interface_id = dev->dd->ipath_guid; |
| hdr->dgid = grh->dgid; |
| |
| /* GRH header size in 32-bit words. */ |
| return sizeof(struct ib_grh) / sizeof(u32); |
| } |
| |
| void ipath_make_ruc_header(struct ipath_ibdev *dev, struct ipath_qp *qp, |
| struct ipath_other_headers *ohdr, |
| u32 bth0, u32 bth2) |
| { |
| u16 lrh0; |
| u32 nwords; |
| u32 extra_bytes; |
| |
| /* Construct the header. */ |
| extra_bytes = -qp->s_cur_size & 3; |
| nwords = (qp->s_cur_size + extra_bytes) >> 2; |
| lrh0 = IPATH_LRH_BTH; |
| if (unlikely(qp->remote_ah_attr.ah_flags & IB_AH_GRH)) { |
| qp->s_hdrwords += ipath_make_grh(dev, &qp->s_hdr.u.l.grh, |
| &qp->remote_ah_attr.grh, |
| qp->s_hdrwords, nwords); |
| lrh0 = IPATH_LRH_GRH; |
| } |
| lrh0 |= qp->remote_ah_attr.sl << 4; |
| qp->s_hdr.lrh[0] = cpu_to_be16(lrh0); |
| qp->s_hdr.lrh[1] = cpu_to_be16(qp->remote_ah_attr.dlid); |
| qp->s_hdr.lrh[2] = cpu_to_be16(qp->s_hdrwords + nwords + SIZE_OF_CRC); |
| qp->s_hdr.lrh[3] = cpu_to_be16(dev->dd->ipath_lid); |
| bth0 |= ipath_get_pkey(dev->dd, qp->s_pkey_index); |
| bth0 |= extra_bytes << 20; |
| ohdr->bth[0] = cpu_to_be32(bth0 | (1 << 22)); |
| ohdr->bth[1] = cpu_to_be32(qp->remote_qpn); |
| ohdr->bth[2] = cpu_to_be32(bth2); |
| } |
| |
| /** |
| * ipath_do_send - perform a send on a QP |
| * @data: contains a pointer to the QP |
| * |
| * Process entries in the send work queue until credit or queue is |
| * exhausted. Only allow one CPU to send a packet per QP (tasklet). |
| * Otherwise, two threads could send packets out of order. |
| */ |
| void ipath_do_send(unsigned long data) |
| { |
| struct ipath_qp *qp = (struct ipath_qp *)data; |
| struct ipath_ibdev *dev = to_idev(qp->ibqp.device); |
| int (*make_req)(struct ipath_qp *qp); |
| |
| if (test_and_set_bit(IPATH_S_BUSY, &qp->s_busy)) |
| goto bail; |
| |
| if ((qp->ibqp.qp_type == IB_QPT_RC || |
| qp->ibqp.qp_type == IB_QPT_UC) && |
| qp->remote_ah_attr.dlid == dev->dd->ipath_lid) { |
| ipath_ruc_loopback(qp); |
| goto clear; |
| } |
| |
| if (qp->ibqp.qp_type == IB_QPT_RC) |
| make_req = ipath_make_rc_req; |
| else if (qp->ibqp.qp_type == IB_QPT_UC) |
| make_req = ipath_make_uc_req; |
| else |
| make_req = ipath_make_ud_req; |
| |
| again: |
| /* Check for a constructed packet to be sent. */ |
| if (qp->s_hdrwords != 0) { |
| /* |
| * If no PIO bufs are available, return. An interrupt will |
| * call ipath_ib_piobufavail() when one is available. |
| */ |
| if (ipath_verbs_send(qp, &qp->s_hdr, qp->s_hdrwords, |
| qp->s_cur_sge, qp->s_cur_size)) { |
| ipath_no_bufs_available(qp, dev); |
| goto bail; |
| } |
| dev->n_unicast_xmit++; |
| /* Record that we sent the packet and s_hdr is empty. */ |
| qp->s_hdrwords = 0; |
| } |
| |
| if (make_req(qp)) |
| goto again; |
| clear: |
| clear_bit(IPATH_S_BUSY, &qp->s_busy); |
| bail:; |
| } |
| |
| void ipath_send_complete(struct ipath_qp *qp, struct ipath_swqe *wqe, |
| enum ib_wc_status status) |
| { |
| unsigned long flags; |
| u32 last; |
| |
| /* See ch. 11.2.4.1 and 10.7.3.1 */ |
| if (!(qp->s_flags & IPATH_S_SIGNAL_REQ_WR) || |
| (wqe->wr.send_flags & IB_SEND_SIGNALED) || |
| status != IB_WC_SUCCESS) { |
| struct ib_wc wc; |
| |
| wc.wr_id = wqe->wr.wr_id; |
| wc.status = status; |
| wc.opcode = ib_ipath_wc_opcode[wqe->wr.opcode]; |
| wc.vendor_err = 0; |
| wc.byte_len = wqe->length; |
| wc.imm_data = 0; |
| wc.qp = &qp->ibqp; |
| wc.src_qp = 0; |
| wc.wc_flags = 0; |
| wc.pkey_index = 0; |
| wc.slid = 0; |
| wc.sl = 0; |
| wc.dlid_path_bits = 0; |
| wc.port_num = 0; |
| ipath_cq_enter(to_icq(qp->ibqp.send_cq), &wc, 0); |
| } |
| |
| spin_lock_irqsave(&qp->s_lock, flags); |
| last = qp->s_last; |
| if (++last >= qp->s_size) |
| last = 0; |
| qp->s_last = last; |
| spin_unlock_irqrestore(&qp->s_lock, flags); |
| } |