438 lines
10 KiB
C
438 lines
10 KiB
C
/*
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* Copyright (c) 2004, 2005 Topspin Communications. All rights reserved.
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* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
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* Copyright (c) 2005 Cisco Systems, Inc. All rights reserved.
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* Copyright (c) 2005 Mellanox Technologies. All rights reserved.
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* Copyright (c) 2004 Voltaire, Inc. All rights reserved.
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* Copyright (c) 2005 Open Grid Computing, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*/
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#include <linux/gfp.h>
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#include "c2.h"
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#include "c2_vq.h"
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#include "c2_status.h"
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#define C2_CQ_MSG_SIZE ((sizeof(struct c2wr_ce) + 32-1) & ~(32-1))
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static struct c2_cq *c2_cq_get(struct c2_dev *c2dev, int cqn)
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{
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struct c2_cq *cq;
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unsigned long flags;
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spin_lock_irqsave(&c2dev->lock, flags);
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cq = c2dev->qptr_array[cqn];
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if (!cq) {
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spin_unlock_irqrestore(&c2dev->lock, flags);
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return NULL;
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}
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atomic_inc(&cq->refcount);
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spin_unlock_irqrestore(&c2dev->lock, flags);
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return cq;
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}
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static void c2_cq_put(struct c2_cq *cq)
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{
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if (atomic_dec_and_test(&cq->refcount))
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wake_up(&cq->wait);
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}
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void c2_cq_event(struct c2_dev *c2dev, u32 mq_index)
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{
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struct c2_cq *cq;
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cq = c2_cq_get(c2dev, mq_index);
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if (!cq) {
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printk("discarding events on destroyed CQN=%d\n", mq_index);
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return;
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}
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(*cq->ibcq.comp_handler) (&cq->ibcq, cq->ibcq.cq_context);
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c2_cq_put(cq);
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}
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void c2_cq_clean(struct c2_dev *c2dev, struct c2_qp *qp, u32 mq_index)
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{
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struct c2_cq *cq;
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struct c2_mq *q;
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cq = c2_cq_get(c2dev, mq_index);
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if (!cq)
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return;
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spin_lock_irq(&cq->lock);
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q = &cq->mq;
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if (q && !c2_mq_empty(q)) {
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u16 priv = q->priv;
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struct c2wr_ce *msg;
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while (priv != be16_to_cpu(*q->shared)) {
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msg = (struct c2wr_ce *)
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(q->msg_pool.host + priv * q->msg_size);
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if (msg->qp_user_context == (u64) (unsigned long) qp) {
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msg->qp_user_context = (u64) 0;
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}
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priv = (priv + 1) % q->q_size;
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}
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}
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spin_unlock_irq(&cq->lock);
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c2_cq_put(cq);
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}
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static inline enum ib_wc_status c2_cqe_status_to_openib(u8 status)
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{
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switch (status) {
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case C2_OK:
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return IB_WC_SUCCESS;
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case CCERR_FLUSHED:
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return IB_WC_WR_FLUSH_ERR;
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case CCERR_BASE_AND_BOUNDS_VIOLATION:
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return IB_WC_LOC_PROT_ERR;
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case CCERR_ACCESS_VIOLATION:
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return IB_WC_LOC_ACCESS_ERR;
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case CCERR_TOTAL_LENGTH_TOO_BIG:
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return IB_WC_LOC_LEN_ERR;
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case CCERR_INVALID_WINDOW:
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return IB_WC_MW_BIND_ERR;
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default:
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return IB_WC_GENERAL_ERR;
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}
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}
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static inline int c2_poll_one(struct c2_dev *c2dev,
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struct c2_cq *cq, struct ib_wc *entry)
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{
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struct c2wr_ce *ce;
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struct c2_qp *qp;
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int is_recv = 0;
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ce = c2_mq_consume(&cq->mq);
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if (!ce) {
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return -EAGAIN;
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}
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/*
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* if the qp returned is null then this qp has already
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* been freed and we are unable process the completion.
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* try pulling the next message
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*/
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while ((qp =
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(struct c2_qp *) (unsigned long) ce->qp_user_context) == NULL) {
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c2_mq_free(&cq->mq);
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ce = c2_mq_consume(&cq->mq);
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if (!ce)
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return -EAGAIN;
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}
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entry->status = c2_cqe_status_to_openib(c2_wr_get_result(ce));
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entry->wr_id = ce->hdr.context;
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entry->qp = &qp->ibqp;
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entry->wc_flags = 0;
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entry->slid = 0;
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entry->sl = 0;
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entry->src_qp = 0;
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entry->dlid_path_bits = 0;
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entry->pkey_index = 0;
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switch (c2_wr_get_id(ce)) {
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case C2_WR_TYPE_SEND:
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entry->opcode = IB_WC_SEND;
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break;
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case C2_WR_TYPE_RDMA_WRITE:
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entry->opcode = IB_WC_RDMA_WRITE;
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break;
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case C2_WR_TYPE_RDMA_READ:
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entry->opcode = IB_WC_RDMA_READ;
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break;
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case C2_WR_TYPE_BIND_MW:
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entry->opcode = IB_WC_BIND_MW;
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break;
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case C2_WR_TYPE_RECV:
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entry->byte_len = be32_to_cpu(ce->bytes_rcvd);
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entry->opcode = IB_WC_RECV;
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is_recv = 1;
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break;
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default:
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break;
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}
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/* consume the WQEs */
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if (is_recv)
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c2_mq_lconsume(&qp->rq_mq, 1);
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else
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c2_mq_lconsume(&qp->sq_mq,
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be32_to_cpu(c2_wr_get_wqe_count(ce)) + 1);
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/* free the message */
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c2_mq_free(&cq->mq);
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return 0;
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}
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int c2_poll_cq(struct ib_cq *ibcq, int num_entries, struct ib_wc *entry)
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{
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struct c2_dev *c2dev = to_c2dev(ibcq->device);
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struct c2_cq *cq = to_c2cq(ibcq);
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unsigned long flags;
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int npolled, err;
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spin_lock_irqsave(&cq->lock, flags);
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for (npolled = 0; npolled < num_entries; ++npolled) {
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err = c2_poll_one(c2dev, cq, entry + npolled);
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if (err)
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break;
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}
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spin_unlock_irqrestore(&cq->lock, flags);
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return npolled;
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}
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int c2_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags notify_flags)
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{
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struct c2_mq_shared __iomem *shared;
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struct c2_cq *cq;
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unsigned long flags;
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int ret = 0;
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cq = to_c2cq(ibcq);
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shared = cq->mq.peer;
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if ((notify_flags & IB_CQ_SOLICITED_MASK) == IB_CQ_NEXT_COMP)
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writeb(C2_CQ_NOTIFICATION_TYPE_NEXT, &shared->notification_type);
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else if ((notify_flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED)
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writeb(C2_CQ_NOTIFICATION_TYPE_NEXT_SE, &shared->notification_type);
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else
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return -EINVAL;
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writeb(CQ_WAIT_FOR_DMA | CQ_ARMED, &shared->armed);
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/*
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* Now read back shared->armed to make the PCI
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* write synchronous. This is necessary for
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* correct cq notification semantics.
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*/
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readb(&shared->armed);
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if (notify_flags & IB_CQ_REPORT_MISSED_EVENTS) {
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spin_lock_irqsave(&cq->lock, flags);
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ret = !c2_mq_empty(&cq->mq);
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spin_unlock_irqrestore(&cq->lock, flags);
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}
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return ret;
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}
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static void c2_free_cq_buf(struct c2_dev *c2dev, struct c2_mq *mq)
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{
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dma_free_coherent(&c2dev->pcidev->dev, mq->q_size * mq->msg_size,
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mq->msg_pool.host, dma_unmap_addr(mq, mapping));
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}
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static int c2_alloc_cq_buf(struct c2_dev *c2dev, struct c2_mq *mq, int q_size,
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int msg_size)
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{
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u8 *pool_start;
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pool_start = dma_alloc_coherent(&c2dev->pcidev->dev, q_size * msg_size,
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&mq->host_dma, GFP_KERNEL);
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if (!pool_start)
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return -ENOMEM;
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c2_mq_rep_init(mq,
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0, /* index (currently unknown) */
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q_size,
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msg_size,
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pool_start,
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NULL, /* peer (currently unknown) */
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C2_MQ_HOST_TARGET);
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dma_unmap_addr_set(mq, mapping, mq->host_dma);
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return 0;
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}
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int c2_init_cq(struct c2_dev *c2dev, int entries,
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struct c2_ucontext *ctx, struct c2_cq *cq)
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{
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struct c2wr_cq_create_req wr;
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struct c2wr_cq_create_rep *reply;
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unsigned long peer_pa;
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struct c2_vq_req *vq_req;
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int err;
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might_sleep();
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cq->ibcq.cqe = entries - 1;
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cq->is_kernel = !ctx;
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/* Allocate a shared pointer */
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cq->mq.shared = c2_alloc_mqsp(c2dev, c2dev->kern_mqsp_pool,
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&cq->mq.shared_dma, GFP_KERNEL);
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if (!cq->mq.shared)
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return -ENOMEM;
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/* Allocate pages for the message pool */
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err = c2_alloc_cq_buf(c2dev, &cq->mq, entries + 1, C2_CQ_MSG_SIZE);
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if (err)
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goto bail0;
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vq_req = vq_req_alloc(c2dev);
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if (!vq_req) {
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err = -ENOMEM;
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goto bail1;
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}
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memset(&wr, 0, sizeof(wr));
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c2_wr_set_id(&wr, CCWR_CQ_CREATE);
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wr.hdr.context = (unsigned long) vq_req;
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wr.rnic_handle = c2dev->adapter_handle;
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wr.msg_size = cpu_to_be32(cq->mq.msg_size);
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wr.depth = cpu_to_be32(cq->mq.q_size);
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wr.shared_ht = cpu_to_be64(cq->mq.shared_dma);
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wr.msg_pool = cpu_to_be64(cq->mq.host_dma);
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wr.user_context = (u64) (unsigned long) (cq);
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vq_req_get(c2dev, vq_req);
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err = vq_send_wr(c2dev, (union c2wr *) & wr);
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if (err) {
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vq_req_put(c2dev, vq_req);
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goto bail2;
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}
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err = vq_wait_for_reply(c2dev, vq_req);
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if (err)
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goto bail2;
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reply = (struct c2wr_cq_create_rep *) (unsigned long) (vq_req->reply_msg);
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if (!reply) {
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err = -ENOMEM;
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goto bail2;
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}
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if ((err = c2_errno(reply)) != 0)
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goto bail3;
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cq->adapter_handle = reply->cq_handle;
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cq->mq.index = be32_to_cpu(reply->mq_index);
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peer_pa = c2dev->pa + be32_to_cpu(reply->adapter_shared);
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cq->mq.peer = ioremap_nocache(peer_pa, PAGE_SIZE);
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if (!cq->mq.peer) {
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err = -ENOMEM;
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goto bail3;
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}
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vq_repbuf_free(c2dev, reply);
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vq_req_free(c2dev, vq_req);
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spin_lock_init(&cq->lock);
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atomic_set(&cq->refcount, 1);
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init_waitqueue_head(&cq->wait);
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/*
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* Use the MQ index allocated by the adapter to
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* store the CQ in the qptr_array
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*/
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cq->cqn = cq->mq.index;
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c2dev->qptr_array[cq->cqn] = cq;
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return 0;
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bail3:
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vq_repbuf_free(c2dev, reply);
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bail2:
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vq_req_free(c2dev, vq_req);
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bail1:
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c2_free_cq_buf(c2dev, &cq->mq);
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bail0:
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c2_free_mqsp(cq->mq.shared);
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return err;
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}
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void c2_free_cq(struct c2_dev *c2dev, struct c2_cq *cq)
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{
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int err;
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struct c2_vq_req *vq_req;
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struct c2wr_cq_destroy_req wr;
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struct c2wr_cq_destroy_rep *reply;
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might_sleep();
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/* Clear CQ from the qptr array */
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spin_lock_irq(&c2dev->lock);
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c2dev->qptr_array[cq->mq.index] = NULL;
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atomic_dec(&cq->refcount);
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spin_unlock_irq(&c2dev->lock);
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wait_event(cq->wait, !atomic_read(&cq->refcount));
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vq_req = vq_req_alloc(c2dev);
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if (!vq_req) {
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goto bail0;
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}
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memset(&wr, 0, sizeof(wr));
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c2_wr_set_id(&wr, CCWR_CQ_DESTROY);
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wr.hdr.context = (unsigned long) vq_req;
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wr.rnic_handle = c2dev->adapter_handle;
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wr.cq_handle = cq->adapter_handle;
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vq_req_get(c2dev, vq_req);
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err = vq_send_wr(c2dev, (union c2wr *) & wr);
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if (err) {
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vq_req_put(c2dev, vq_req);
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goto bail1;
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}
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err = vq_wait_for_reply(c2dev, vq_req);
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if (err)
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goto bail1;
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reply = (struct c2wr_cq_destroy_rep *) (unsigned long) (vq_req->reply_msg);
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if (reply)
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vq_repbuf_free(c2dev, reply);
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bail1:
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vq_req_free(c2dev, vq_req);
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bail0:
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if (cq->is_kernel) {
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c2_free_cq_buf(c2dev, &cq->mq);
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}
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return;
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}
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