/*
* Copyright (c) 2006, 2007, 2008 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/err.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include "ipath_verbs.h"
#include "ipath_kernel.h"
#define BITS_PER_PAGE (PAGE_SIZE*BITS_PER_BYTE)
#define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1)
#define mk_qpn(qpt, map, off) (((map) - (qpt)->map) * BITS_PER_PAGE + \
(off))
#define find_next_offset(map, off) find_next_zero_bit((map)->page, \
BITS_PER_PAGE, off)
/*
* Convert the AETH credit code into the number of credits.
*/
static u32 credit_table[31] = {
0, /* 0 */
1, /* 1 */
2, /* 2 */
3, /* 3 */
4, /* 4 */
6, /* 5 */
8, /* 6 */
12, /* 7 */
16, /* 8 */
24, /* 9 */
32, /* A */
48, /* B */
64, /* C */
96, /* D */
128, /* E */
192, /* F */
256, /* 10 */
384, /* 11 */
512, /* 12 */
768, /* 13 */
1024, /* 14 */
1536, /* 15 */
2048, /* 16 */
3072, /* 17 */
4096, /* 18 */
6144, /* 19 */
8192, /* 1A */
12288, /* 1B */
16384, /* 1C */
24576, /* 1D */
32768 /* 1E */
};
static void get_map_page(struct ipath_qp_table *qpt, struct qpn_map *map)
{
unsigned long page = get_zeroed_page(GFP_KERNEL);
unsigned long flags;
/*
* Free the page if someone raced with us installing it.
*/
spin_lock_irqsave(&qpt->lock, flags);
if (map->page)
free_page(page);
else
map->page = (void *)page;
spin_unlock_irqrestore(&qpt->lock, flags);
}
static int alloc_qpn(struct ipath_qp_table *qpt, enum ib_qp_type type)
{
u32 i, offset, max_scan, qpn;
struct qpn_map *map;
u32 ret = -1;
if (type == IB_QPT_SMI)
ret = 0;
else if (type == IB_QPT_GSI)
ret = 1;
if (ret != -1) {
map = &qpt->map[0];
if (unlikely(!map->page)) {
get_map_page(qpt, map);
if (unlikely(!map->page)) {
ret = -ENOMEM;
goto bail;
}
}
if (!test_and_set_bit(ret, map->page))
atomic_dec(&map->n_free);
else
ret = -EBUSY;
goto bail;
}
qpn = qpt->last + 1;
if (qpn >= QPN_MAX)
qpn = 2;
offset = qpn & BITS_PER_PAGE_MASK;
map = &qpt->map[qpn / BITS_PER_PAGE];
max_scan = qpt->nmaps - !offset;
for (i = 0;;) {
if (unlikely(!map->page)) {
get_map_page(qpt, map);
if (unlikely(!map->page))
break;
}
if (likely(atomic_read(&map->n_free))) {
do {
if (!test_and_set_bit(offset, map->page)) {
atomic_dec(&map->n_free);
qpt->last = qpn;
ret = qpn;
goto bail;
}
offset = find_next_offset(map, offset);
qpn = mk_qpn(qpt, map, offset);
/*
* This test differs from alloc_pidmap().
* If find_next_offset() does find a zero
* bit, we don't need to check for QPN
* wrapping around past our starting QPN.
* We just need to be sure we don't loop
* forever.
*/
} while (offset < BITS_PER_PAGE && qpn < QPN_MAX);
}
/*
* In order to keep the number of pages allocated to a
* minimum, we scan the all existing pages before increasing
* the size of the bitmap table.
*/
if (++i > max_scan) {
if (qpt->nmaps == QPNMAP_ENTRIES)
break;
map = &qpt->map[qpt->nmaps++];
offset = 0;
} else if (map < &qpt->map[qpt->nmaps]) {
++map;
offset = 0;
} else {
map = &qpt->map[0];
offset = 2;
}
qpn = mk_qpn(qpt, map, offset);
}
ret = -ENOMEM;
bail:
return ret;
}
static void free_qpn(struct ipath_qp_table *qpt, u32 qpn)
{
struct qpn_map *map;
map = qpt->map + qpn / BITS_PER_PAGE;
if (map->page)
clear_bit(qpn & BITS_PER_PAGE_MASK, map->page);
atomic_inc(&map->n_free);
}
/**
* ipath_alloc_qpn - allocate a QP number
* @qpt: the QP table
* @qp: the QP
* @type: the QP type (IB_QPT_SMI and IB_QPT_GSI are special)
*
* Allocate the next available QPN and put the QP into the hash table.
* The hash table holds a reference to the QP.
*/
static int ipath_alloc_qpn(struct ipath_qp_table *qpt, struct ipath_qp *qp,
enum ib_qp_type type)
{
unsigned long flags;
int ret;
ret = alloc_qpn(qpt, type);
if (ret < 0)
goto bail;
qp->ibqp.qp_num = ret;
/* Add the QP to the hash table. */
spin_lock_irqsave(&qpt->lock, flags);
ret %= qpt->max;
qp->next = qpt->table[ret];
qpt->table[ret] = qp;
atomic_inc(&qp->refcount);
spin_unlock_irqrestore(&qpt->lock, flags);
ret = 0;
bail:
return ret;
}
/**
* ipath_free_qp - remove a QP from the QP table
* @qpt: the QP table
* @qp: the QP to remove
*
* Remove the QP from the table so it can't be found asynchronously by
* the receive interrupt routine.
*/
static void ipath_free_qp(struct ipath_qp_table *qpt, struct ipath_qp *qp)
{
struct ipath_qp *q, **qpp;
unsigned long flags;
spin_lock_irqsave(&qpt->lock, flags);
/* Remove QP from the hash table. */
qpp = &qpt->table[qp->ibqp.qp_num % qpt->max];
for (; (q = *qpp) != NULL; qpp = &q->next) {
if (q == qp) {
*qpp = qp->next;
qp->next = NULL;
atomic_dec(&qp->refcount);
break;
}
}
spin_unlock_irqrestore(&qpt->lock, flags);
}
/**
* ipath_free_all_qps - check for QPs still in use
* @qpt: the QP table to empty
*
* There should not be any QPs still in use.
* Free memory for table.
*/
unsigned ipath_free_all_qps(struct ipath_qp_table *qpt)
{
unsigned long flags;
struct ipath_qp *qp;
u32 n, qp_inuse = 0;
spin_lock_irqsave(&qpt->lock, flags);
for (n = 0; n < qpt->max; n++) {
qp = qpt->table[n];
qpt->table[n] = NULL;
for (; qp; qp = qp->next)
qp_inuse++;
}
spin_unlock_irqrestore(&qpt->lock, flags);
for (n = 0; n < ARRAY_SIZE(qpt->map); n++)
if (qpt->map[n].page)
free_page((unsigned long) qpt->map[n].page);
return qp_inuse;
}
/**
* ipath_lookup_qpn - return the QP with the given QPN
* @qpt: the QP table
* @qpn: the QP number to look up
*
* The caller is responsible for decrementing the QP reference count
* when done.
*/
struct ipath_qp *ipath_lookup_qpn(struct ipath_qp_table *qpt, u32 qpn)
{
unsigned long flags;
struct ipath_qp *qp;
spin_lock_irqsave(&qpt->lock, flags);
for (qp = qpt->table[qpn % qpt->max]; qp; qp = qp->next) {
if (qp->ibqp.qp_num == qpn) {
atomic_inc(&qp->refcount);
break;
}
}
spin_unlock_irqrestore(&qpt->lock, flags);
return qp;
}
/**
* ipath_reset_qp - initialize the QP state to the reset state
* @qp: the QP to reset
* @type: the QP type
*/
static void ipath_reset_qp(struct ipath_qp *qp, enum ib_qp_type type)
{
qp->remote_qpn = 0;
qp->qkey = 0;
qp->qp_access_flags = 0;
atomic_set(&qp->s_dma_busy, 0);
qp->s_flags &= IPATH_S_SIGNAL_REQ_WR;
qp->s_hdrwords = 0;
qp->s_wqe = NULL;
qp->s_pkt_delay = 0;
qp->s_draining = 0;
qp->s_psn = 0;
qp->r_psn = 0;
qp->r_msn = 0;
if (type == IB_QPT_RC) {
qp->s_state = IB_OPCODE_RC_SEND_LAST;
qp->r_state = IB_OPCODE_RC_SEND_LAST;
} else {
qp->s_state = IB_OPCODE_UC_SEND_LAST;
qp->r_state = IB_OPCODE_UC_SEND_LAST;
}
qp->s_ack_state = IB_OPCODE_RC_ACKNOWLEDGE;
qp->r_nak_state = 0;
qp->r_aflags = 0;
qp->r_flags = 0;
qp->s_rnr_timeout = 0;
qp->s_head = 0;
qp->s_tail = 0;
qp->s_cur = 0;
qp->s_last = 0;
qp->s_ssn = 1;
qp->s_lsn = 0;
memset(qp->s_ack_queue, 0, sizeof(qp->s_ack_queue));
qp->r_head_ack_queue = 0;
qp->s_tail_ack_queue = 0;
qp->s_num_rd_atomic = 0;
if (qp->r_rq.wq) {
qp->r_rq.wq->head = 0;
qp->r_rq.wq->tail = 0;
}
}
/**
* ipath_error_qp - put a QP into the error state
* @qp: the QP to put into the error state
* @err: the receive completion error to signal if a RWQE is active
*
* Flushes both send and receive work queues.
* Returns true if last WQE event should be generated.
* The QP s_lock should be held and interrupts disabled.
* If we are already in error state, just return.
*/
int ipath_error_qp(struct ipath_qp *qp, enum ib_wc_status err)
{
struct ipath_ibdev *dev = to_idev(qp->ibqp.device);
struct ib_wc wc;
int ret = 0;
if (qp->state == IB_QPS_ERR)
goto bail;
qp->state = IB_QPS_ERR;
spin_lock(&dev->pending_lock);
if (!list_empty(&qp->timerwait))
list_del_init(&qp->timerwait);
if (!list_empty(&qp->piowait))
list_del_init(&qp->piowait);
spin_unlock(&dev->pending_lock);
/* Schedule the sending tasklet to drain the send work queue. */
if (qp->s_last != qp->s_head)
ipath_schedule_send(qp);
memset(&wc, 0, sizeof(wc));
wc.qp = &qp->ibqp;
wc.opcode = IB_WC_RECV;
if (test_and_clear_bit(IPATH_R_WRID_VALID, &qp->r_aflags)) {
wc.wr_id = qp->r_wr_id;
wc.status = err;
ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
}
wc.status = IB_WC_WR_FLUSH_ERR;
if (qp->r_rq.wq) {
struct ipath_rwq *wq;
u32 head;
u32 tail;
spin_lock(&qp->r_rq.lock);
/* sanity check pointers before trusting them */
wq = qp->r_rq.wq;
head = wq->head;
if (head >= qp->r_rq.size)
head = 0;
tail = wq->tail;
if (tail >= qp->r_rq.size)
tail = 0;
while (tail != head) {
wc.wr_id = get_rwqe_ptr(&qp->r_rq, tail)->wr_id;
if (++tail >= qp->r_rq.size)
tail = 0;
ipath_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
}
wq->tail = tail;
spin_unlock(&qp->r_rq.lock);
} else if (qp->ibqp.event_handler)
ret = 1;
bail:
return ret;
}
/**
* ipath_modify_qp - modify the attributes of a queue pair
* @ibqp: the queue pair who's attributes we're modifying
* @attr: the new attributes
* @attr_mask: the mask of attributes to modify
* @udata: user data for ipathverbs.so
*
* Returns 0 on success, otherwise returns an errno.
*/
int ipath_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
int attr_mask, struct ib_udata *udata)
{
struct ipath_ibdev *dev = to_idev(ibqp->device);
struct ipath_qp *qp = to_iqp(ibqp);
enum ib_qp_state cur_state, new_state;
int lastwqe = 0;
int ret;
spin_lock_irq(&qp->s_lock);
cur_state = attr_mask & IB_QP_CUR_STATE ?
attr->cur_qp_state : qp->state;
new_state = attr_mask & IB_QP_STATE ? attr->qp_state : cur_state;
if (!ib_modify_qp_is_ok(cur_state, new_state, ibqp->qp_type,
attr_mask))
goto inval;
if (attr_mask & IB_QP_AV) {
if (attr->ah_attr.dlid == 0 ||
attr->ah_attr.dlid >= IPATH_MULTICAST_LID_BASE)
goto inval;
if ((attr->ah_attr.ah_flags & IB_AH_GRH) &&
(attr->ah_attr.grh.sgid_index > 1))
goto inval;
}
if (attr_mask & IB_QP_PKEY_INDEX)
if (attr->pkey_index >= ipath_get_npkeys(dev->dd))
goto inval;
if (attr_mask & IB_QP_MIN_RNR_TIMER)
if (attr->min_rnr_timer > 31)
goto inval;
if (attr_mask & IB_QP_PORT)
if (attr->port_num == 0 ||
attr->port_num > ibqp->device->phys_port_cnt)
goto inval;
/*
* don't allow invalid Path MTU values or greater than 2048
* unless we are configured for a 4KB MTU
*/
if ((attr_mask & IB_QP_PATH_MTU) &&
(ib_mtu_enum_to_int(attr->path_mtu) == -1 ||
(attr->path_mtu > IB_MTU_2048 && !ipath_mtu4096)))
goto inval;
if (attr_mask & IB_QP_PATH_MIG_STATE)
if (attr->path_mig_state != IB_MIG_MIGRATED &&
attr->path_mig_state != IB_MIG_REARM)
goto inval;
if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
if (attr->max_dest_rd_atomic > IPATH_MAX_RDMA_ATOMIC)
goto inval;
switch (new_state) {
case IB_QPS_RESET:
if (qp->state != IB_QPS_RESET) {
qp->state = IB_QPS_RESET;
spin_lock(&dev->pending_lock);
if (!list_empty(&qp->timerwait))
list_del_init(&qp->timerwait);
if (!list_empty(&qp->piowait))
list_del_init(&qp->piowait);
spin_unlock(&dev->pending_lock);
qp->s_flags &= ~IPATH_S_ANY_WAIT;
spin_unlock_irq(&qp->s_lock);
/* Stop the sending tasklet */
tasklet_kill(&qp->s_task);
wait_event(qp->wait_dma, !atomic_read(&qp->s_dma_busy));
spin_lock_irq(&qp->s_lock);
}
ipath_reset_qp(qp, ibqp->qp_type);
break;
case IB_QPS_SQD:
qp->s_draining = qp->s_last != qp->s_cur;
qp->state = new_state;
break;
case IB_QPS_SQE:
if (qp->ibqp.qp_type == IB_QPT_RC)
goto inval;
qp->state = new_state;
break;
case IB_QPS_ERR:
lastwqe = ipath_error_qp(qp, IB_WC_WR_FLUSH_ERR);
break;
default:
qp->state = new_state;
break;
}
if (attr_mask & IB_QP_PKEY_INDEX)
qp->s_pkey_index = attr->pkey_index;
if (attr_mask & IB_QP_DEST_QPN)
qp->remote_qpn = attr->dest_qp_num;
if (attr_mask & IB_QP_SQ_PSN) {
qp->s_psn = qp->s_next_psn = attr->sq_psn;
qp->s_last_psn = qp->s_next_psn - 1;
}
if (attr_mask & IB_QP_RQ_PSN)
qp->r_psn = attr->rq_psn;
if (attr_mask & IB_QP_ACCESS_FLAGS)
qp->qp_access_flags = attr->qp_access_flags;
if (attr_mask & IB_QP_AV) {
qp->remote_ah_attr = attr->ah_attr;
qp->s_dmult = ipath_ib_rate_to_mult(attr->ah_attr.static_rate);
}
if (attr_mask & IB_QP_PATH_MTU)
qp->path_mtu = attr->path_mtu;
if (attr_mask & IB_QP_RETRY_CNT)
qp->s_retry = qp->s_retry_cnt = attr->retry_cnt;
if (attr_mask & IB_QP_RNR_RETRY) {
qp->s_rnr_retry = attr->rnr_retry;
if (qp->s_rnr_retry > 7)
qp->s_rnr_retry = 7;
qp->s_rnr_retry_cnt = qp->s_rnr_retry;
}
if (attr_mask & IB_QP_MIN_RNR_TIMER)
qp->r_min_rnr_timer = attr->min_rnr_timer;
if (attr_mask & IB_QP_TIMEOUT)
qp->timeout = attr->timeout;
if (attr_mask & IB_QP_QKEY)
qp->qkey = attr->qkey;
if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
qp->r_max_rd_atomic = attr->max_dest_rd_atomic;
if (attr_mask & IB_QP_MAX_QP_RD_ATOMIC)
qp->s_max_rd_atomic = attr->max_rd_atomic;
spin_unlock_irq(&qp->s_lock);
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);
}
ret = 0;
goto bail;
inval:
spin_unlock_irq(&qp->s_lock);
ret = -EINVAL;
bail:
return ret;
}
int ipath_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
int attr_mask, struct ib_qp_init_attr *init_attr)
{
struct ipath_qp *qp = to_iqp(ibqp);
attr->qp_state = qp->state;
attr->cur_qp_state = attr->qp_state;
attr->path_mtu = qp->path_mtu;
attr->path_mig_state = 0;
attr->qkey = qp->qkey;
attr->rq_psn = qp->r_psn;
attr->sq_psn = qp->s_next_psn;
attr->dest_qp_num = qp->remote_qpn;
attr->qp_access_flags = qp->qp_access_flags;
attr->cap.max_send_wr = qp->s_size - 1;
attr->cap.max_recv_wr = qp->ibqp.srq ? 0 : qp->r_rq.size - 1;
attr->cap.max_send_sge = qp->s_max_sge;
attr->cap.max_recv_sge = qp->r_rq.max_sge;
attr->cap.max_inline_data = 0;
attr->ah_attr = qp->remote_ah_attr;
memset(&attr->alt_ah_attr, 0, sizeof(attr->alt_ah_attr));
attr->pkey_index = qp->s_pkey_index;
attr->alt_pkey_index = 0;
attr->en_sqd_async_notify = 0;
attr->sq_draining = qp->s_draining;
attr->max_rd_atomic = qp->s_max_rd_atomic;
attr->max_dest_rd_atomic = qp->r_max_rd_atomic;
attr->min_rnr_timer = qp->r_min_rnr_timer;
attr->port_num = 1;
attr->timeout = qp->timeout;
attr->retry_cnt = qp->s_retry_cnt;
attr->rnr_retry = qp->s_rnr_retry_cnt;
attr->alt_port_num = 0;
attr->alt_timeout = 0;
init_attr->event_handler = qp->ibqp.event_handler;
init_attr->qp_context = qp->ibqp.qp_context;
init_attr->send_cq = qp->ibqp.send_cq;
init_attr->recv_cq = qp->ibqp.recv_cq;
init_attr->srq = qp->ibqp.srq;
init_attr->cap = attr->cap;
if (qp->s_flags & IPATH_S_SIGNAL_REQ_WR)
init_attr->sq_sig_type = IB_SIGNAL_REQ_WR;
else
init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
init_attr->qp_type = qp->ibqp.qp_type;
init_attr->port_num = 1;
return 0;
}
/**
* ipath_compute_aeth - compute the AETH (syndrome + MSN)
* @qp: the queue pair to compute the AETH for
*
* Returns the AETH.
*/
__be32 ipath_compute_aeth(struct ipath_qp *qp)
{
u32 aeth = qp->r_msn & IPATH_MSN_MASK;
if (qp->ibqp.srq) {
/*
* Shared receive queues don't generate credits.
* Set the credit field to the invalid value.
*/
aeth |= IPATH_AETH_CREDIT_INVAL << IPATH_AETH_CREDIT_SHIFT;
} else {
u32 min, max, x;
u32 credits;
struct ipath_rwq *wq = qp->r_rq.wq;
u32 head;
u32 tail;
/* sanity check pointers before trusting them */
head = wq->head;
if (head >= qp->r_rq.size)
head = 0;
tail = wq->tail;
if (tail >= qp->r_rq.size)
tail = 0;
/*
* Compute the number of credits available (RWQEs).
* XXX Not holding the r_rq.lock here so there is a small
* chance that the pair of reads are not atomic.
*/
credits = head - tail;
if ((int)credits < 0)
credits += qp->r_rq.size;
/*
* Binary search the credit table to find the code to
* use.
*/
min = 0;
max = 31;
for (;;) {
x = (min + max) / 2;
if (credit_table[x] == credits)
break;
if (credit_table[x] > credits)
max = x;
else if (min == x)
break;
else
min = x;
}
aeth |= x << IPATH_AETH_CREDIT_SHIFT;
}
return cpu_to_be32(aeth);
}
/**
* ipath_create_qp - create a queue pair for a device
* @ibpd: the protection domain who's device we create the queue pair for
* @init_attr: the attributes of the queue pair
* @udata: unused by InfiniPath
*
* Returns the queue pair on success, otherwise returns an errno.
*
* Called by the ib_create_qp() core verbs function.
*/
struct ib_qp *ipath_create_qp(struct ib_pd *ibpd,
struct ib_qp_init_attr *init_attr,
struct ib_udata *udata)
{
struct ipath_qp *qp;
int err;
struct ipath_swqe *swq = NULL;
struct ipath_ibdev *dev;
size_t sz;
size_t sg_list_sz;
struct ib_qp *ret;
if (init_attr->create_flags) {
ret = ERR_PTR(-EINVAL);
goto bail;
}
if (init_attr->cap.max_send_sge > ib_ipath_max_sges ||
init_attr->cap.max_send_wr > ib_ipath_max_qp_wrs) {
ret = ERR_PTR(-EINVAL);
goto bail;
}
/* Check receive queue parameters if no SRQ is specified. */
if (!init_attr->srq) {
if (init_attr->cap.max_recv_sge > ib_ipath_max_sges ||
init_attr->cap.max_recv_wr > ib_ipath_max_qp_wrs) {
ret = ERR_PTR(-EINVAL);
goto bail;
}
if (init_attr->cap.max_send_sge +
init_attr->cap.max_send_wr +
init_attr->cap.max_recv_sge +
init_attr->cap.max_recv_wr == 0) {
ret = ERR_PTR(-EINVAL);
goto bail;
}
}
switch (init_attr->qp_type) {
case IB_QPT_UC:
case IB_QPT_RC:
case IB_QPT_UD:
case IB_QPT_SMI:
case IB_QPT_GSI:
sz = sizeof(struct ipath_sge) *
init_attr->cap.max_send_sge +
sizeof(struct ipath_swqe);
swq = vmalloc((init_attr->cap.max_send_wr + 1) * sz);
if (swq == NULL) {
ret = ERR_PTR(-ENOMEM);
goto bail;
}
sz = sizeof(*qp);
sg_list_sz = 0;
if (init_attr->srq) {
struct ipath_srq *srq = to_isrq(init_attr->srq);
if (srq->rq.max_sge > 1)
sg_list_sz = sizeof(*qp->r_sg_list) *
(srq->rq.max_sge - 1);
} else if (init_attr->cap.max_recv_sge > 1)
sg_list_sz = sizeof(*qp->r_sg_list) *
(init_attr->cap.max_recv_sge - 1);
qp = kmalloc(sz + sg_list_sz, GFP_KERNEL);
if (!qp) {
ret = ERR_PTR(-ENOMEM);
goto bail_swq;
}
if (sg_list_sz && (init_attr->qp_type == IB_QPT_UD ||
init_attr->qp_type == IB_QPT_SMI ||
init_attr->qp_type == IB_QPT_GSI)) {
qp->r_ud_sg_list = kmalloc(sg_list_sz, GFP_KERNEL);
if (!qp->r_ud_sg_list) {
ret = ERR_PTR(-ENOMEM);
goto bail_qp;
}
} else
qp->r_ud_sg_list = NULL;
if (init_attr->srq) {
sz = 0;
qp->r_rq.size = 0;
qp->r_rq.max_sge = 0;
qp->r_rq.wq = NULL;
init_attr->cap.max_recv_wr = 0;
init_attr->cap.max_recv_sge = 0;
} else {
qp->r_rq.size = init_attr->cap.max_recv_wr + 1;
qp->r_rq.max_sge = init_attr->cap.max_recv_sge;
sz = (sizeof(struct ib_sge) * qp->r_rq.max_sge) +
sizeof(struct ipath_rwqe);
qp->r_rq.wq = vmalloc_user(sizeof(struct ipath_rwq) +
qp->r_rq.size * sz);
if (!qp->r_rq.wq) {
ret = ERR_PTR(-ENOMEM);
goto bail_sg_list;
}
}
/*
* ib_create_qp() will initialize qp->ibqp
* except for qp->ibqp.qp_num.
*/
spin_lock_init(&qp->s_lock);
spin_lock_init(&qp->r_rq.lock);
atomic_set(&qp->refcount, 0);
init_waitqueue_head(&qp->wait);
init_waitqueue_head(&qp->wait_dma);
tasklet_init(&qp->s_task, ipath_do_send, (unsigned long)qp);
INIT_LIST_HEAD(&qp->piowait);
INIT_LIST_HEAD(&qp->timerwait);
qp->state = IB_QPS_RESET;
qp->s_wq = swq;
qp->s_size = init_attr->cap.max_send_wr + 1;
qp->s_max_sge = init_attr->cap.max_send_sge;
if (init_attr->sq_sig_type == IB_SIGNAL_REQ_WR)
qp->s_flags = IPATH_S_SIGNAL_REQ_WR;
else
qp->s_flags = 0;
dev = to_idev(ibpd->device);
err = ipath_alloc_qpn(&dev->qp_table, qp,
init_attr->qp_type);
if (err) {
ret = ERR_PTR(err);
vfree(qp->r_rq.wq);
goto bail_sg_list;
}
qp->ip = NULL;
qp->s_tx = NULL;
ipath_reset_qp(qp, init_attr->qp_type);
break;
default:
/* Don't support raw QPs */
ret = ERR_PTR(-ENOSYS);
goto bail;
}
init_attr->cap.max_inline_data = 0;
/*
* Return the address of the RWQ as the offset to mmap.
* See ipath_mmap() for details.
*/
if (udata && udata->outlen >= sizeof(__u64)) {
if (!qp->r_rq.wq) {
__u64 offset = 0;
err = ib_copy_to_udata(udata, &offset,
sizeof(offset));
if (err) {
ret = ERR_PTR(err);
goto bail_ip;
}
} else {
u32 s = sizeof(struct ipath_rwq) +
qp->r_rq.size * sz;
qp->ip =
ipath_create_mmap_info(dev, s,
ibpd->uobject->context,
qp->r_rq.wq);
if (!qp->ip) {
ret = ERR_PTR(-ENOMEM);
goto bail_ip;
}
err = ib_copy_to_udata(udata, &(qp->ip->offset),
sizeof(qp->ip->offset));
if (err) {
ret = ERR_PTR(err);
goto bail_ip;
}
}
}
spin_lock(&dev->n_qps_lock);
if (dev->n_qps_allocated == ib_ipath_max_qps) {
spin_unlock(&dev->n_qps_lock);
ret = ERR_PTR(-ENOMEM);
goto bail_ip;
}
dev->n_qps_allocated++;
spin_unlock(&dev->n_qps_lock);
if (qp->ip) {
spin_lock_irq(&dev->pending_lock);
list_add(&qp->ip->pending_mmaps, &dev->pending_mmaps);
spin_unlock_irq(&dev->pending_lock);
}
ret = &qp->ibqp;
goto bail;
bail_ip:
if (qp->ip)
kref_put(&qp->ip->ref, ipath_release_mmap_info);
else
vfree(qp->r_rq.wq);
ipath_free_qp(&dev->qp_table, qp);
free_qpn(&dev->qp_table, qp->ibqp.qp_num);
bail_sg_list:
kfree(qp->r_ud_sg_list);
bail_qp:
kfree(qp);
bail_swq:
vfree(swq);
bail:
return ret;
}
/**
* ipath_destroy_qp - destroy a queue pair
* @ibqp: the queue pair to destroy
*
* Returns 0 on success.
*
* Note that this can be called while the QP is actively sending or
* receiving!
*/
int ipath_destroy_qp(struct ib_qp *ibqp)
{
struct ipath_qp *qp = to_iqp(ibqp);
struct ipath_ibdev *dev = to_idev(ibqp->device);
/* Make sure HW and driver activity is stopped. */
spin_lock_irq(&qp->s_lock);
if (qp->state != IB_QPS_RESET) {
qp->state = IB_QPS_RESET;
spin_lock(&dev->pending_lock);
if (!list_empty(&qp->timerwait))
list_del_init(&qp->timerwait);
if (!list_empty(&qp->piowait))
list_del_init(&qp->piowait);
spin_unlock(&dev->pending_lock);
qp->s_flags &= ~IPATH_S_ANY_WAIT;
spin_unlock_irq(&qp->s_lock);
/* Stop the sending tasklet */
tasklet_kill(&qp->s_task);
wait_event(qp->wait_dma, !atomic_read(&qp->s_dma_busy));
} else
spin_unlock_irq(&qp->s_lock);
ipath_free_qp(&dev->qp_table, qp);
if (qp->s_tx) {
atomic_dec(&qp->refcount);
if (qp->s_tx->txreq.flags & IPATH_SDMA_TXREQ_F_FREEBUF)
kfree(qp->s_tx->txreq.map_addr);
spin_lock_irq(&dev->pending_lock);
list_add(&qp->s_tx->txreq.list, &dev->txreq_free);
spin_unlock_irq(&dev->pending_lock);
qp->s_tx = NULL;
}
wait_event(qp->wait, !atomic_read(&qp->refcount));
/* all user's cleaned up, mark it available */
free_qpn(&dev->qp_table, qp->ibqp.qp_num);
spin_lock(&dev->n_qps_lock);
dev->n_qps_allocated--;
spin_unlock(&dev->n_qps_lock);
if (qp->ip)
kref_put(&qp->ip->ref, ipath_release_mmap_info);
else
vfree(qp->r_rq.wq);
kfree(qp->r_ud_sg_list);
vfree(qp->s_wq);
kfree(qp);
return 0;
}
/**
* ipath_init_qp_table - initialize the QP table for a device
* @idev: the device who's QP table we're initializing
* @size: the size of the QP table
*
* Returns 0 on success, otherwise returns an errno.
*/
int ipath_init_qp_table(struct ipath_ibdev *idev, int size)
{
int i;
int ret;
idev->qp_table.last = 1; /* QPN 0 and 1 are special. */
idev->qp_table.max = size;
idev->qp_table.nmaps = 1;
idev->qp_table.table = kzalloc(size * sizeof(*idev->qp_table.table),
GFP_KERNEL);
if (idev->qp_table.table == NULL) {
ret = -ENOMEM;
goto bail;
}
for (i = 0; i < ARRAY_SIZE(idev->qp_table.map); i++) {
atomic_set(&idev->qp_table.map[i].n_free, BITS_PER_PAGE);
idev->qp_table.map[i].page = NULL;
}
ret = 0;
bail:
return ret;
}
/**
* ipath_get_credit - flush the send work queue of a QP
* @qp: the qp who's send work queue to flush
* @aeth: the Acknowledge Extended Transport Header
*
* The QP s_lock should be held.
*/
void ipath_get_credit(struct ipath_qp *qp, u32 aeth)
{
u32 credit = (aeth >> IPATH_AETH_CREDIT_SHIFT) & IPATH_AETH_CREDIT_MASK;
/*
* If the credit is invalid, we can send
* as many packets as we like. Otherwise, we have to
* honor the credit field.
*/
if (credit == IPATH_AETH_CREDIT_INVAL)
qp->s_lsn = (u32) -1;
else if (qp->s_lsn != (u32) -1) {
/* Compute new LSN (i.e., MSN + credit) */
credit = (aeth + credit_table[credit]) & IPATH_MSN_MASK;
if (ipath_cmp24(credit, qp->s_lsn) > 0)
qp->s_lsn = credit;
}
/* Restart sending if it was blocked due to lack of credits. */
if ((qp->s_flags & IPATH_S_WAIT_SSN_CREDIT) &&
qp->s_cur != qp->s_head &&
(qp->s_lsn == (u32) -1 ||
ipath_cmp24(get_swqe_ptr(qp, qp->s_cur)->ssn,
qp->s_lsn + 1) <= 0))
ipath_schedule_send(qp);
}