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linux/drivers/infiniband/hw/mthca/mthca_cq.c

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/*
* Copyright (c) 2004, 2005 Topspin Communications. All rights reserved.
* Copyright (c) 2005 Sun Microsystems, Inc. All rights reserved.
* Copyright (c) 2005, 2006 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2005 Mellanox Technologies. All rights reserved.
* Copyright (c) 2004 Voltaire, 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/gfp.h>
#include <linux/hardirq.h>
#include <linux/sched.h>
#include <asm/io.h>
#include <rdma/ib_pack.h>
#include "mthca_dev.h"
#include "mthca_cmd.h"
#include "mthca_memfree.h"
enum {
MTHCA_MAX_DIRECT_CQ_SIZE = 4 * PAGE_SIZE
};
enum {
MTHCA_CQ_ENTRY_SIZE = 0x20
};
enum {
MTHCA_ATOMIC_BYTE_LEN = 8
};
/*
* Must be packed because start is 64 bits but only aligned to 32 bits.
*/
struct mthca_cq_context {
__be32 flags;
__be64 start;
__be32 logsize_usrpage;
__be32 error_eqn; /* Tavor only */
__be32 comp_eqn;
__be32 pd;
__be32 lkey;
__be32 last_notified_index;
__be32 solicit_producer_index;
__be32 consumer_index;
__be32 producer_index;
__be32 cqn;
__be32 ci_db; /* Arbel only */
__be32 state_db; /* Arbel only */
u32 reserved;
} __attribute__((packed));
#define MTHCA_CQ_STATUS_OK ( 0 << 28)
#define MTHCA_CQ_STATUS_OVERFLOW ( 9 << 28)
#define MTHCA_CQ_STATUS_WRITE_FAIL (10 << 28)
#define MTHCA_CQ_FLAG_TR ( 1 << 18)
#define MTHCA_CQ_FLAG_OI ( 1 << 17)
#define MTHCA_CQ_STATE_DISARMED ( 0 << 8)
#define MTHCA_CQ_STATE_ARMED ( 1 << 8)
#define MTHCA_CQ_STATE_ARMED_SOL ( 4 << 8)
#define MTHCA_EQ_STATE_FIRED (10 << 8)
enum {
MTHCA_ERROR_CQE_OPCODE_MASK = 0xfe
};
enum {
SYNDROME_LOCAL_LENGTH_ERR = 0x01,
SYNDROME_LOCAL_QP_OP_ERR = 0x02,
SYNDROME_LOCAL_EEC_OP_ERR = 0x03,
SYNDROME_LOCAL_PROT_ERR = 0x04,
SYNDROME_WR_FLUSH_ERR = 0x05,
SYNDROME_MW_BIND_ERR = 0x06,
SYNDROME_BAD_RESP_ERR = 0x10,
SYNDROME_LOCAL_ACCESS_ERR = 0x11,
SYNDROME_REMOTE_INVAL_REQ_ERR = 0x12,
SYNDROME_REMOTE_ACCESS_ERR = 0x13,
SYNDROME_REMOTE_OP_ERR = 0x14,
SYNDROME_RETRY_EXC_ERR = 0x15,
SYNDROME_RNR_RETRY_EXC_ERR = 0x16,
SYNDROME_LOCAL_RDD_VIOL_ERR = 0x20,
SYNDROME_REMOTE_INVAL_RD_REQ_ERR = 0x21,
SYNDROME_REMOTE_ABORTED_ERR = 0x22,
SYNDROME_INVAL_EECN_ERR = 0x23,
SYNDROME_INVAL_EEC_STATE_ERR = 0x24
};
struct mthca_cqe {
__be32 my_qpn;
__be32 my_ee;
__be32 rqpn;
u8 sl_ipok;
u8 g_mlpath;
__be16 rlid;
__be32 imm_etype_pkey_eec;
__be32 byte_cnt;
__be32 wqe;
u8 opcode;
u8 is_send;
u8 reserved;
u8 owner;
};
struct mthca_err_cqe {
__be32 my_qpn;
u32 reserved1[3];
u8 syndrome;
u8 vendor_err;
__be16 db_cnt;
u32 reserved2;
__be32 wqe;
u8 opcode;
u8 reserved3[2];
u8 owner;
};
#define MTHCA_CQ_ENTRY_OWNER_SW (0 << 7)
#define MTHCA_CQ_ENTRY_OWNER_HW (1 << 7)
#define MTHCA_TAVOR_CQ_DB_INC_CI (1 << 24)
#define MTHCA_TAVOR_CQ_DB_REQ_NOT (2 << 24)
#define MTHCA_TAVOR_CQ_DB_REQ_NOT_SOL (3 << 24)
#define MTHCA_TAVOR_CQ_DB_SET_CI (4 << 24)
#define MTHCA_TAVOR_CQ_DB_REQ_NOT_MULT (5 << 24)
#define MTHCA_ARBEL_CQ_DB_REQ_NOT_SOL (1 << 24)
#define MTHCA_ARBEL_CQ_DB_REQ_NOT (2 << 24)
#define MTHCA_ARBEL_CQ_DB_REQ_NOT_MULT (3 << 24)
static inline struct mthca_cqe *get_cqe_from_buf(struct mthca_cq_buf *buf,
int entry)
{
if (buf->is_direct)
return buf->queue.direct.buf + (entry * MTHCA_CQ_ENTRY_SIZE);
else
return buf->queue.page_list[entry * MTHCA_CQ_ENTRY_SIZE / PAGE_SIZE].buf
+ (entry * MTHCA_CQ_ENTRY_SIZE) % PAGE_SIZE;
}
static inline struct mthca_cqe *get_cqe(struct mthca_cq *cq, int entry)
{
return get_cqe_from_buf(&cq->buf, entry);
}
static inline struct mthca_cqe *cqe_sw(struct mthca_cqe *cqe)
{
return MTHCA_CQ_ENTRY_OWNER_HW & cqe->owner ? NULL : cqe;
}
static inline struct mthca_cqe *next_cqe_sw(struct mthca_cq *cq)
{
return cqe_sw(get_cqe(cq, cq->cons_index & cq->ibcq.cqe));
}
static inline void set_cqe_hw(struct mthca_cqe *cqe)
{
cqe->owner = MTHCA_CQ_ENTRY_OWNER_HW;
}
static void dump_cqe(struct mthca_dev *dev, void *cqe_ptr)
{
__be32 *cqe = cqe_ptr;
(void) cqe; /* avoid warning if mthca_dbg compiled away... */
mthca_dbg(dev, "CQE contents %08x %08x %08x %08x %08x %08x %08x %08x\n",
be32_to_cpu(cqe[0]), be32_to_cpu(cqe[1]), be32_to_cpu(cqe[2]),
be32_to_cpu(cqe[3]), be32_to_cpu(cqe[4]), be32_to_cpu(cqe[5]),
be32_to_cpu(cqe[6]), be32_to_cpu(cqe[7]));
}
/*
* incr is ignored in native Arbel (mem-free) mode, so cq->cons_index
* should be correct before calling update_cons_index().
*/
static inline void update_cons_index(struct mthca_dev *dev, struct mthca_cq *cq,
int incr)
{
if (mthca_is_memfree(dev)) {
*cq->set_ci_db = cpu_to_be32(cq->cons_index);
wmb();
} else {
mthca_write64(MTHCA_TAVOR_CQ_DB_INC_CI | cq->cqn, incr - 1,
dev->kar + MTHCA_CQ_DOORBELL,
MTHCA_GET_DOORBELL_LOCK(&dev->doorbell_lock));
/*
* Make sure doorbells don't leak out of CQ spinlock
* and reach the HCA out of order:
*/
mmiowb();
}
}
void mthca_cq_completion(struct mthca_dev *dev, u32 cqn)
{
struct mthca_cq *cq;
cq = mthca_array_get(&dev->cq_table.cq, cqn & (dev->limits.num_cqs - 1));
if (!cq) {
mthca_warn(dev, "Completion event for bogus CQ %08x\n", cqn);
return;
}
++cq->arm_sn;
cq->ibcq.comp_handler(&cq->ibcq, cq->ibcq.cq_context);
}
void mthca_cq_event(struct mthca_dev *dev, u32 cqn,
enum ib_event_type event_type)
{
struct mthca_cq *cq;
struct ib_event event;
spin_lock(&dev->cq_table.lock);
cq = mthca_array_get(&dev->cq_table.cq, cqn & (dev->limits.num_cqs - 1));
if (cq)
++cq->refcount;
spin_unlock(&dev->cq_table.lock);
if (!cq) {
mthca_warn(dev, "Async event for bogus CQ %08x\n", cqn);
return;
}
event.device = &dev->ib_dev;
event.event = event_type;
event.element.cq = &cq->ibcq;
if (cq->ibcq.event_handler)
cq->ibcq.event_handler(&event, cq->ibcq.cq_context);
spin_lock(&dev->cq_table.lock);
if (!--cq->refcount)
wake_up(&cq->wait);
spin_unlock(&dev->cq_table.lock);
}
static inline int is_recv_cqe(struct mthca_cqe *cqe)
{
if ((cqe->opcode & MTHCA_ERROR_CQE_OPCODE_MASK) ==
MTHCA_ERROR_CQE_OPCODE_MASK)
return !(cqe->opcode & 0x01);
else
return !(cqe->is_send & 0x80);
}
void mthca_cq_clean(struct mthca_dev *dev, struct mthca_cq *cq, u32 qpn,
struct mthca_srq *srq)
{
struct mthca_cqe *cqe;
u32 prod_index;
int i, nfreed = 0;
spin_lock_irq(&cq->lock);
/*
* First we need to find the current producer index, so we
* know where to start cleaning from. It doesn't matter if HW
* adds new entries after this loop -- the QP we're worried
* about is already in RESET, so the new entries won't come
* from our QP and therefore don't need to be checked.
*/
for (prod_index = cq->cons_index;
cqe_sw(get_cqe(cq, prod_index & cq->ibcq.cqe));
++prod_index)
if (prod_index == cq->cons_index + cq->ibcq.cqe)
break;
if (0)
mthca_dbg(dev, "Cleaning QPN %06x from CQN %06x; ci %d, pi %d\n",
qpn, cq->cqn, cq->cons_index, prod_index);
/*
* Now sweep backwards through the CQ, removing CQ entries
* that match our QP by copying older entries on top of them.
*/
while ((int) --prod_index - (int) cq->cons_index >= 0) {
cqe = get_cqe(cq, prod_index & cq->ibcq.cqe);
if (cqe->my_qpn == cpu_to_be32(qpn)) {
if (srq && is_recv_cqe(cqe))
mthca_free_srq_wqe(srq, be32_to_cpu(cqe->wqe));
++nfreed;
} else if (nfreed)
memcpy(get_cqe(cq, (prod_index + nfreed) & cq->ibcq.cqe),
cqe, MTHCA_CQ_ENTRY_SIZE);
}
if (nfreed) {
for (i = 0; i < nfreed; ++i)
set_cqe_hw(get_cqe(cq, (cq->cons_index + i) & cq->ibcq.cqe));
wmb();
cq->cons_index += nfreed;
update_cons_index(dev, cq, nfreed);
}
spin_unlock_irq(&cq->lock);
}
void mthca_cq_resize_copy_cqes(struct mthca_cq *cq)
{
int i;
/*
* In Tavor mode, the hardware keeps the consumer and producer
* indices mod the CQ size. Since we might be making the CQ
* bigger, we need to deal with the case where the producer
* index wrapped around before the CQ was resized.
*/
if (!mthca_is_memfree(to_mdev(cq->ibcq.device)) &&
cq->ibcq.cqe < cq->resize_buf->cqe) {
cq->cons_index &= cq->ibcq.cqe;
if (cqe_sw(get_cqe(cq, cq->ibcq.cqe)))
cq->cons_index -= cq->ibcq.cqe + 1;
}
for (i = cq->cons_index; cqe_sw(get_cqe(cq, i & cq->ibcq.cqe)); ++i)
memcpy(get_cqe_from_buf(&cq->resize_buf->buf,
i & cq->resize_buf->cqe),
get_cqe(cq, i & cq->ibcq.cqe), MTHCA_CQ_ENTRY_SIZE);
}
int mthca_alloc_cq_buf(struct mthca_dev *dev, struct mthca_cq_buf *buf, int nent)
{
int ret;
int i;
ret = mthca_buf_alloc(dev, nent * MTHCA_CQ_ENTRY_SIZE,
MTHCA_MAX_DIRECT_CQ_SIZE,
&buf->queue, &buf->is_direct,
&dev->driver_pd, 1, &buf->mr);
if (ret)
return ret;
for (i = 0; i < nent; ++i)
set_cqe_hw(get_cqe_from_buf(buf, i));
return 0;
}
void mthca_free_cq_buf(struct mthca_dev *dev, struct mthca_cq_buf *buf, int cqe)
{
mthca_buf_free(dev, (cqe + 1) * MTHCA_CQ_ENTRY_SIZE, &buf->queue,
buf->is_direct, &buf->mr);
}
static void handle_error_cqe(struct mthca_dev *dev, struct mthca_cq *cq,
struct mthca_qp *qp, int wqe_index, int is_send,
struct mthca_err_cqe *cqe,
struct ib_wc *entry, int *free_cqe)
{
int dbd;
__be32 new_wqe;
if (cqe->syndrome == SYNDROME_LOCAL_QP_OP_ERR) {
mthca_dbg(dev, "local QP operation err "
"(QPN %06x, WQE @ %08x, CQN %06x, index %d)\n",
be32_to_cpu(cqe->my_qpn), be32_to_cpu(cqe->wqe),
cq->cqn, cq->cons_index);
dump_cqe(dev, cqe);
}
/*
* For completions in error, only work request ID, status, vendor error
* (and freed resource count for RD) have to be set.
*/
switch (cqe->syndrome) {
case SYNDROME_LOCAL_LENGTH_ERR:
entry->status = IB_WC_LOC_LEN_ERR;
break;
case SYNDROME_LOCAL_QP_OP_ERR:
entry->status = IB_WC_LOC_QP_OP_ERR;
break;
case SYNDROME_LOCAL_EEC_OP_ERR:
entry->status = IB_WC_LOC_EEC_OP_ERR;
break;
case SYNDROME_LOCAL_PROT_ERR:
entry->status = IB_WC_LOC_PROT_ERR;
break;
case SYNDROME_WR_FLUSH_ERR:
entry->status = IB_WC_WR_FLUSH_ERR;
break;
case SYNDROME_MW_BIND_ERR:
entry->status = IB_WC_MW_BIND_ERR;
break;
case SYNDROME_BAD_RESP_ERR:
entry->status = IB_WC_BAD_RESP_ERR;
break;
case SYNDROME_LOCAL_ACCESS_ERR:
entry->status = IB_WC_LOC_ACCESS_ERR;
break;
case SYNDROME_REMOTE_INVAL_REQ_ERR:
entry->status = IB_WC_REM_INV_REQ_ERR;
break;
case SYNDROME_REMOTE_ACCESS_ERR:
entry->status = IB_WC_REM_ACCESS_ERR;
break;
case SYNDROME_REMOTE_OP_ERR:
entry->status = IB_WC_REM_OP_ERR;
break;
case SYNDROME_RETRY_EXC_ERR:
entry->status = IB_WC_RETRY_EXC_ERR;
break;
case SYNDROME_RNR_RETRY_EXC_ERR:
entry->status = IB_WC_RNR_RETRY_EXC_ERR;
break;
case SYNDROME_LOCAL_RDD_VIOL_ERR:
entry->status = IB_WC_LOC_RDD_VIOL_ERR;
break;
case SYNDROME_REMOTE_INVAL_RD_REQ_ERR:
entry->status = IB_WC_REM_INV_RD_REQ_ERR;
break;
case SYNDROME_REMOTE_ABORTED_ERR:
entry->status = IB_WC_REM_ABORT_ERR;
break;
case SYNDROME_INVAL_EECN_ERR:
entry->status = IB_WC_INV_EECN_ERR;
break;
case SYNDROME_INVAL_EEC_STATE_ERR:
entry->status = IB_WC_INV_EEC_STATE_ERR;
break;
default:
entry->status = IB_WC_GENERAL_ERR;
break;
}
entry->vendor_err = cqe->vendor_err;
/*
* Mem-free HCAs always generate one CQE per WQE, even in the
* error case, so we don't have to check the doorbell count, etc.
*/
if (mthca_is_memfree(dev))
return;
mthca_free_err_wqe(dev, qp, is_send, wqe_index, &dbd, &new_wqe);
/*
* If we're at the end of the WQE chain, or we've used up our
* doorbell count, free the CQE. Otherwise just update it for
* the next poll operation.
*/
if (!(new_wqe & cpu_to_be32(0x3f)) || (!cqe->db_cnt && dbd))
return;
be16_add_cpu(&cqe->db_cnt, -dbd);
cqe->wqe = new_wqe;
cqe->syndrome = SYNDROME_WR_FLUSH_ERR;
*free_cqe = 0;
}
static inline int mthca_poll_one(struct mthca_dev *dev,
struct mthca_cq *cq,
struct mthca_qp **cur_qp,
int *freed,
struct ib_wc *entry)
{
struct mthca_wq *wq;
struct mthca_cqe *cqe;
int wqe_index;
int is_error;
int is_send;
int free_cqe = 1;
int err = 0;
u16 checksum;
cqe = next_cqe_sw(cq);
if (!cqe)
return -EAGAIN;
/*
* Make sure we read CQ entry contents after we've checked the
* ownership bit.
*/
rmb();
if (0) {
mthca_dbg(dev, "%x/%d: CQE -> QPN %06x, WQE @ %08x\n",
cq->cqn, cq->cons_index, be32_to_cpu(cqe->my_qpn),
be32_to_cpu(cqe->wqe));
dump_cqe(dev, cqe);
}
is_error = (cqe->opcode & MTHCA_ERROR_CQE_OPCODE_MASK) ==
MTHCA_ERROR_CQE_OPCODE_MASK;
is_send = is_error ? cqe->opcode & 0x01 : cqe->is_send & 0x80;
if (!*cur_qp || be32_to_cpu(cqe->my_qpn) != (*cur_qp)->qpn) {
/*
* We do not have to take the QP table lock here,
* because CQs will be locked while QPs are removed
* from the table.
*/
*cur_qp = mthca_array_get(&dev->qp_table.qp,
be32_to_cpu(cqe->my_qpn) &
(dev->limits.num_qps - 1));
if (!*cur_qp) {
mthca_warn(dev, "CQ entry for unknown QP %06x\n",
be32_to_cpu(cqe->my_qpn) & 0xffffff);
err = -EINVAL;
goto out;
}
}
entry->qp = &(*cur_qp)->ibqp;
if (is_send) {
wq = &(*cur_qp)->sq;
wqe_index = ((be32_to_cpu(cqe->wqe) - (*cur_qp)->send_wqe_offset)
>> wq->wqe_shift);
entry->wr_id = (*cur_qp)->wrid[wqe_index +
(*cur_qp)->rq.max];
} else if ((*cur_qp)->ibqp.srq) {
struct mthca_srq *srq = to_msrq((*cur_qp)->ibqp.srq);
u32 wqe = be32_to_cpu(cqe->wqe);
wq = NULL;
wqe_index = wqe >> srq->wqe_shift;
entry->wr_id = srq->wrid[wqe_index];
mthca_free_srq_wqe(srq, wqe);
} else {
s32 wqe;
wq = &(*cur_qp)->rq;
wqe = be32_to_cpu(cqe->wqe);
wqe_index = wqe >> wq->wqe_shift;
/*
* WQE addr == base - 1 might be reported in receive completion
* with error instead of (rq size - 1) by Sinai FW 1.0.800 and
* Arbel FW 5.1.400. This bug should be fixed in later FW revs.
*/
if (unlikely(wqe_index < 0))
wqe_index = wq->max - 1;
entry->wr_id = (*cur_qp)->wrid[wqe_index];
}
if (wq) {
if (wq->last_comp < wqe_index)
wq->tail += wqe_index - wq->last_comp;
else
wq->tail += wqe_index + wq->max - wq->last_comp;
wq->last_comp = wqe_index;
}
if (is_error) {
handle_error_cqe(dev, cq, *cur_qp, wqe_index, is_send,
(struct mthca_err_cqe *) cqe,
entry, &free_cqe);
goto out;
}
if (is_send) {
entry->wc_flags = 0;
switch (cqe->opcode) {
case MTHCA_OPCODE_RDMA_WRITE:
entry->opcode = IB_WC_RDMA_WRITE;
break;
case MTHCA_OPCODE_RDMA_WRITE_IMM:
entry->opcode = IB_WC_RDMA_WRITE;
entry->wc_flags |= IB_WC_WITH_IMM;
break;
case MTHCA_OPCODE_SEND:
entry->opcode = IB_WC_SEND;
break;
case MTHCA_OPCODE_SEND_IMM:
entry->opcode = IB_WC_SEND;
entry->wc_flags |= IB_WC_WITH_IMM;
break;
case MTHCA_OPCODE_RDMA_READ:
entry->opcode = IB_WC_RDMA_READ;
entry->byte_len = be32_to_cpu(cqe->byte_cnt);
break;
case MTHCA_OPCODE_ATOMIC_CS:
entry->opcode = IB_WC_COMP_SWAP;
entry->byte_len = MTHCA_ATOMIC_BYTE_LEN;
break;
case MTHCA_OPCODE_ATOMIC_FA:
entry->opcode = IB_WC_FETCH_ADD;
entry->byte_len = MTHCA_ATOMIC_BYTE_LEN;
break;
case MTHCA_OPCODE_BIND_MW:
entry->opcode = IB_WC_BIND_MW;
break;
default:
entry->opcode = MTHCA_OPCODE_INVALID;
break;
}
} else {
entry->byte_len = be32_to_cpu(cqe->byte_cnt);
switch (cqe->opcode & 0x1f) {
case IB_OPCODE_SEND_LAST_WITH_IMMEDIATE:
case IB_OPCODE_SEND_ONLY_WITH_IMMEDIATE:
entry->wc_flags = IB_WC_WITH_IMM;
entry->ex.imm_data = cqe->imm_etype_pkey_eec;
entry->opcode = IB_WC_RECV;
break;
case IB_OPCODE_RDMA_WRITE_LAST_WITH_IMMEDIATE:
case IB_OPCODE_RDMA_WRITE_ONLY_WITH_IMMEDIATE:
entry->wc_flags = IB_WC_WITH_IMM;
entry->ex.imm_data = cqe->imm_etype_pkey_eec;
entry->opcode = IB_WC_RECV_RDMA_WITH_IMM;
break;
default:
entry->wc_flags = 0;
entry->opcode = IB_WC_RECV;
break;
}
entry->slid = be16_to_cpu(cqe->rlid);
entry->sl = cqe->sl_ipok >> 4;
entry->src_qp = be32_to_cpu(cqe->rqpn) & 0xffffff;
entry->dlid_path_bits = cqe->g_mlpath & 0x7f;
entry->pkey_index = be32_to_cpu(cqe->imm_etype_pkey_eec) >> 16;
entry->wc_flags |= cqe->g_mlpath & 0x80 ? IB_WC_GRH : 0;
checksum = (be32_to_cpu(cqe->rqpn) >> 24) |
((be32_to_cpu(cqe->my_ee) >> 16) & 0xff00);
entry->csum_ok = (cqe->sl_ipok & 1 && checksum == 0xffff);
}
entry->status = IB_WC_SUCCESS;
out:
if (likely(free_cqe)) {
set_cqe_hw(cqe);
++(*freed);
++cq->cons_index;
}
return err;
}
int mthca_poll_cq(struct ib_cq *ibcq, int num_entries,
struct ib_wc *entry)
{
struct mthca_dev *dev = to_mdev(ibcq->device);
struct mthca_cq *cq = to_mcq(ibcq);
struct mthca_qp *qp = NULL;
unsigned long flags;
int err = 0;
int freed = 0;
int npolled;
spin_lock_irqsave(&cq->lock, flags);
npolled = 0;
repoll:
while (npolled < num_entries) {
err = mthca_poll_one(dev, cq, &qp,
&freed, entry + npolled);
if (err)
break;
++npolled;
}
if (freed) {
wmb();
update_cons_index(dev, cq, freed);
}
/*
* If a CQ resize is in progress and we discovered that the
* old buffer is empty, then peek in the new buffer, and if
* it's not empty, switch to the new buffer and continue
* polling there.
*/
if (unlikely(err == -EAGAIN && cq->resize_buf &&
cq->resize_buf->state == CQ_RESIZE_READY)) {
/*
* In Tavor mode, the hardware keeps the producer
* index modulo the CQ size. Since we might be making
* the CQ bigger, we need to mask our consumer index
* using the size of the old CQ buffer before looking
* in the new CQ buffer.
*/
if (!mthca_is_memfree(dev))
cq->cons_index &= cq->ibcq.cqe;
if (cqe_sw(get_cqe_from_buf(&cq->resize_buf->buf,
cq->cons_index & cq->resize_buf->cqe))) {
struct mthca_cq_buf tbuf;
int tcqe;
tbuf = cq->buf;
tcqe = cq->ibcq.cqe;
cq->buf = cq->resize_buf->buf;
cq->ibcq.cqe = cq->resize_buf->cqe;
cq->resize_buf->buf = tbuf;
cq->resize_buf->cqe = tcqe;
cq->resize_buf->state = CQ_RESIZE_SWAPPED;
goto repoll;
}
}
spin_unlock_irqrestore(&cq->lock, flags);
return err == 0 || err == -EAGAIN ? npolled : err;
}
int mthca_tavor_arm_cq(struct ib_cq *cq, enum ib_cq_notify_flags flags)
{
u32 dbhi = ((flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ?
MTHCA_TAVOR_CQ_DB_REQ_NOT_SOL :
MTHCA_TAVOR_CQ_DB_REQ_NOT) |
to_mcq(cq)->cqn;
mthca_write64(dbhi, 0xffffffff, to_mdev(cq->device)->kar + MTHCA_CQ_DOORBELL,
MTHCA_GET_DOORBELL_LOCK(&to_mdev(cq->device)->doorbell_lock));
return 0;
}
int mthca_arbel_arm_cq(struct ib_cq *ibcq, enum ib_cq_notify_flags flags)
{
struct mthca_cq *cq = to_mcq(ibcq);
__be32 db_rec[2];
u32 dbhi;
u32 sn = cq->arm_sn & 3;
db_rec[0] = cpu_to_be32(cq->cons_index);
db_rec[1] = cpu_to_be32((cq->cqn << 8) | (2 << 5) | (sn << 3) |
((flags & IB_CQ_SOLICITED_MASK) ==
IB_CQ_SOLICITED ? 1 : 2));
mthca_write_db_rec(db_rec, cq->arm_db);
/*
* Make sure that the doorbell record in host memory is
* written before ringing the doorbell via PCI MMIO.
*/
wmb();
dbhi = (sn << 28) |
((flags & IB_CQ_SOLICITED_MASK) == IB_CQ_SOLICITED ?
MTHCA_ARBEL_CQ_DB_REQ_NOT_SOL :
MTHCA_ARBEL_CQ_DB_REQ_NOT) | cq->cqn;
mthca_write64(dbhi, cq->cons_index,
to_mdev(ibcq->device)->kar + MTHCA_CQ_DOORBELL,
MTHCA_GET_DOORBELL_LOCK(&to_mdev(ibcq->device)->doorbell_lock));
return 0;
}
int mthca_init_cq(struct mthca_dev *dev, int nent,
struct mthca_ucontext *ctx, u32 pdn,
struct mthca_cq *cq)
{
struct mthca_mailbox *mailbox;
struct mthca_cq_context *cq_context;
int err = -ENOMEM;
u8 status;
cq->ibcq.cqe = nent - 1;
cq->is_kernel = !ctx;
cq->cqn = mthca_alloc(&dev->cq_table.alloc);
if (cq->cqn == -1)
return -ENOMEM;
if (mthca_is_memfree(dev)) {
err = mthca_table_get(dev, dev->cq_table.table, cq->cqn);
if (err)
goto err_out;
if (cq->is_kernel) {
cq->arm_sn = 1;
err = -ENOMEM;
cq->set_ci_db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_CQ_SET_CI,
cq->cqn, &cq->set_ci_db);
if (cq->set_ci_db_index < 0)
goto err_out_icm;
cq->arm_db_index = mthca_alloc_db(dev, MTHCA_DB_TYPE_CQ_ARM,
cq->cqn, &cq->arm_db);
if (cq->arm_db_index < 0)
goto err_out_ci;
}
}
mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
if (IS_ERR(mailbox))
goto err_out_arm;
cq_context = mailbox->buf;
if (cq->is_kernel) {
err = mthca_alloc_cq_buf(dev, &cq->buf, nent);
if (err)
goto err_out_mailbox;
}
spin_lock_init(&cq->lock);
cq->refcount = 1;
init_waitqueue_head(&cq->wait);
mutex_init(&cq->mutex);
memset(cq_context, 0, sizeof *cq_context);
cq_context->flags = cpu_to_be32(MTHCA_CQ_STATUS_OK |
MTHCA_CQ_STATE_DISARMED |
MTHCA_CQ_FLAG_TR);
cq_context->logsize_usrpage = cpu_to_be32((ffs(nent) - 1) << 24);
if (ctx)
cq_context->logsize_usrpage |= cpu_to_be32(ctx->uar.index);
else
cq_context->logsize_usrpage |= cpu_to_be32(dev->driver_uar.index);
cq_context->error_eqn = cpu_to_be32(dev->eq_table.eq[MTHCA_EQ_ASYNC].eqn);
cq_context->comp_eqn = cpu_to_be32(dev->eq_table.eq[MTHCA_EQ_COMP].eqn);
cq_context->pd = cpu_to_be32(pdn);
cq_context->lkey = cpu_to_be32(cq->buf.mr.ibmr.lkey);
cq_context->cqn = cpu_to_be32(cq->cqn);
if (mthca_is_memfree(dev)) {
cq_context->ci_db = cpu_to_be32(cq->set_ci_db_index);
cq_context->state_db = cpu_to_be32(cq->arm_db_index);
}
err = mthca_SW2HW_CQ(dev, mailbox, cq->cqn, &status);
if (err) {
mthca_warn(dev, "SW2HW_CQ failed (%d)\n", err);
goto err_out_free_mr;
}
if (status) {
mthca_warn(dev, "SW2HW_CQ returned status 0x%02x\n",
status);
err = -EINVAL;
goto err_out_free_mr;
}
spin_lock_irq(&dev->cq_table.lock);
if (mthca_array_set(&dev->cq_table.cq,
cq->cqn & (dev->limits.num_cqs - 1),
cq)) {
spin_unlock_irq(&dev->cq_table.lock);
goto err_out_free_mr;
}
spin_unlock_irq(&dev->cq_table.lock);
cq->cons_index = 0;
mthca_free_mailbox(dev, mailbox);
return 0;
err_out_free_mr:
if (cq->is_kernel)
mthca_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
err_out_mailbox:
mthca_free_mailbox(dev, mailbox);
err_out_arm:
if (cq->is_kernel && mthca_is_memfree(dev))
mthca_free_db(dev, MTHCA_DB_TYPE_CQ_ARM, cq->arm_db_index);
err_out_ci:
if (cq->is_kernel && mthca_is_memfree(dev))
mthca_free_db(dev, MTHCA_DB_TYPE_CQ_SET_CI, cq->set_ci_db_index);
err_out_icm:
mthca_table_put(dev, dev->cq_table.table, cq->cqn);
err_out:
mthca_free(&dev->cq_table.alloc, cq->cqn);
return err;
}
static inline int get_cq_refcount(struct mthca_dev *dev, struct mthca_cq *cq)
{
int c;
spin_lock_irq(&dev->cq_table.lock);
c = cq->refcount;
spin_unlock_irq(&dev->cq_table.lock);
return c;
}
void mthca_free_cq(struct mthca_dev *dev,
struct mthca_cq *cq)
{
struct mthca_mailbox *mailbox;
int err;
u8 status;
mailbox = mthca_alloc_mailbox(dev, GFP_KERNEL);
if (IS_ERR(mailbox)) {
mthca_warn(dev, "No memory for mailbox to free CQ.\n");
return;
}
err = mthca_HW2SW_CQ(dev, mailbox, cq->cqn, &status);
if (err)
mthca_warn(dev, "HW2SW_CQ failed (%d)\n", err);
else if (status)
mthca_warn(dev, "HW2SW_CQ returned status 0x%02x\n", status);
if (0) {
__be32 *ctx = mailbox->buf;
int j;
printk(KERN_ERR "context for CQN %x (cons index %x, next sw %d)\n",
cq->cqn, cq->cons_index,
cq->is_kernel ? !!next_cqe_sw(cq) : 0);
for (j = 0; j < 16; ++j)
printk(KERN_ERR "[%2x] %08x\n", j * 4, be32_to_cpu(ctx[j]));
}
spin_lock_irq(&dev->cq_table.lock);
mthca_array_clear(&dev->cq_table.cq,
cq->cqn & (dev->limits.num_cqs - 1));
--cq->refcount;
spin_unlock_irq(&dev->cq_table.lock);
if (dev->mthca_flags & MTHCA_FLAG_MSI_X)
synchronize_irq(dev->eq_table.eq[MTHCA_EQ_COMP].msi_x_vector);
else
synchronize_irq(dev->pdev->irq);
wait_event(cq->wait, !get_cq_refcount(dev, cq));
if (cq->is_kernel) {
mthca_free_cq_buf(dev, &cq->buf, cq->ibcq.cqe);
if (mthca_is_memfree(dev)) {
mthca_free_db(dev, MTHCA_DB_TYPE_CQ_ARM, cq->arm_db_index);
mthca_free_db(dev, MTHCA_DB_TYPE_CQ_SET_CI, cq->set_ci_db_index);
}
}
mthca_table_put(dev, dev->cq_table.table, cq->cqn);
mthca_free(&dev->cq_table.alloc, cq->cqn);
mthca_free_mailbox(dev, mailbox);
}
int mthca_init_cq_table(struct mthca_dev *dev)
{
int err;
spin_lock_init(&dev->cq_table.lock);
err = mthca_alloc_init(&dev->cq_table.alloc,
dev->limits.num_cqs,
(1 << 24) - 1,
dev->limits.reserved_cqs);
if (err)
return err;
err = mthca_array_init(&dev->cq_table.cq,
dev->limits.num_cqs);
if (err)
mthca_alloc_cleanup(&dev->cq_table.alloc);
return err;
}
void mthca_cleanup_cq_table(struct mthca_dev *dev)
{
mthca_array_cleanup(&dev->cq_table.cq, dev->limits.num_cqs);
mthca_alloc_cleanup(&dev->cq_table.alloc);
}
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