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kernel-ark/drivers/infiniband/hw/qib/qib_qp.c
Mike Marciniszyn 1fb9fed6d4 IB/qib: Fix QP RCU sparse warnings 
Commit af061a644a ("IB/qib: Use RCU for qpn lookup") introduced sparse
warnings.

This patch corrects those issues.

Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
2012-07-17 10:18:37 -07:00

1293 lines
32 KiB
C
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/*
* Copyright (c) 2012 Intel Corporation. All rights reserved.
* Copyright (c) 2006 - 2012 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/vmalloc.h>
#include <linux/jhash.h>
#include "qib.h"
#define BITS_PER_PAGE (PAGE_SIZE*BITS_PER_BYTE)
#define BITS_PER_PAGE_MASK (BITS_PER_PAGE-1)
static inline unsigned mk_qpn(struct qib_qpn_table *qpt,
struct qpn_map *map, unsigned off)
{
return (map - qpt->map) * BITS_PER_PAGE + off;
}
static inline unsigned find_next_offset(struct qib_qpn_table *qpt,
struct qpn_map *map, unsigned off,
unsigned n)
{
if (qpt->mask) {
off++;
if (((off & qpt->mask) >> 1) >= n)
off = (off | qpt->mask) + 2;
} else
off = find_next_zero_bit(map->page, BITS_PER_PAGE, off);
return 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 qib_qpn_table *qpt, struct qpn_map *map)
{
unsigned long page = get_zeroed_page(GFP_KERNEL);
/*
* Free the page if someone raced with us installing it.
*/
spin_lock(&qpt->lock);
if (map->page)
free_page(page);
else
map->page = (void *)page;
spin_unlock(&qpt->lock);
}
/*
* Allocate the next available QPN or
* zero/one for QP type IB_QPT_SMI/IB_QPT_GSI.
*/
static int alloc_qpn(struct qib_devdata *dd, struct qib_qpn_table *qpt,
enum ib_qp_type type, u8 port)
{
u32 i, offset, max_scan, qpn;
struct qpn_map *map;
u32 ret;
if (type == IB_QPT_SMI || type == IB_QPT_GSI) {
unsigned n;
ret = type == IB_QPT_GSI;
n = 1 << (ret + 2 * (port - 1));
spin_lock(&qpt->lock);
if (qpt->flags & n)
ret = -EINVAL;
else
qpt->flags |= n;
spin_unlock(&qpt->lock);
goto bail;
}
qpn = qpt->last + 2;
if (qpn >= QPN_MAX)
qpn = 2;
if (qpt->mask && ((qpn & qpt->mask) >> 1) >= dd->n_krcv_queues)
qpn = (qpn | qpt->mask) + 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;
}
do {
if (!test_and_set_bit(offset, map->page)) {
qpt->last = qpn;
ret = qpn;
goto bail;
}
offset = find_next_offset(qpt, map, offset,
dd->n_krcv_queues);
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 qib_qpn_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);
}
static inline unsigned qpn_hash(struct qib_ibdev *dev, u32 qpn)
{
return jhash_1word(qpn, dev->qp_rnd) &
(dev->qp_table_size - 1);
}
/*
* Put the QP into the hash table.
* The hash table holds a reference to the QP.
*/
static void insert_qp(struct qib_ibdev *dev, struct qib_qp *qp)
{
struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
unsigned long flags;
unsigned n = qpn_hash(dev, qp->ibqp.qp_num);
spin_lock_irqsave(&dev->qpt_lock, flags);
atomic_inc(&qp->refcount);
if (qp->ibqp.qp_num == 0)
rcu_assign_pointer(ibp->qp0, qp);
else if (qp->ibqp.qp_num == 1)
rcu_assign_pointer(ibp->qp1, qp);
else {
qp->next = dev->qp_table[n];
rcu_assign_pointer(dev->qp_table[n], qp);
}
spin_unlock_irqrestore(&dev->qpt_lock, flags);
synchronize_rcu();
}
/*
* Remove the QP from the table so it can't be found asynchronously by
* the receive interrupt routine.
*/
static void remove_qp(struct qib_ibdev *dev, struct qib_qp *qp)
{
struct qib_ibport *ibp = to_iport(qp->ibqp.device, qp->port_num);
unsigned n = qpn_hash(dev, qp->ibqp.qp_num);
unsigned long flags;
spin_lock_irqsave(&dev->qpt_lock, flags);
if (rcu_dereference_protected(ibp->qp0,
lockdep_is_held(&dev->qpt_lock)) == qp) {
atomic_dec(&qp->refcount);
rcu_assign_pointer(ibp->qp0, NULL);
} else if (rcu_dereference_protected(ibp->qp1,
lockdep_is_held(&dev->qpt_lock)) == qp) {
atomic_dec(&qp->refcount);
rcu_assign_pointer(ibp->qp1, NULL);
} else {
struct qib_qp *q;
struct qib_qp __rcu **qpp;
qpp = &dev->qp_table[n];
q = rcu_dereference_protected(*qpp,
lockdep_is_held(&dev->qpt_lock));
for (; q; qpp = &q->next) {
if (q == qp) {
atomic_dec(&qp->refcount);
*qpp = qp->next;
rcu_assign_pointer(qp->next, NULL);
q = rcu_dereference_protected(*qpp,
lockdep_is_held(&dev->qpt_lock));
break;
}
q = rcu_dereference_protected(*qpp,
lockdep_is_held(&dev->qpt_lock));
}
}
spin_unlock_irqrestore(&dev->qpt_lock, flags);
synchronize_rcu();
}
/**
* qib_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 qib_free_all_qps(struct qib_devdata *dd)
{
struct qib_ibdev *dev = &dd->verbs_dev;
unsigned long flags;
struct qib_qp *qp;
unsigned n, qp_inuse = 0;
for (n = 0; n < dd->num_pports; n++) {
struct qib_ibport *ibp = &dd->pport[n].ibport_data;
if (!qib_mcast_tree_empty(ibp))
qp_inuse++;
rcu_read_lock();
if (rcu_dereference(ibp->qp0))
qp_inuse++;
if (rcu_dereference(ibp->qp1))
qp_inuse++;
rcu_read_unlock();
}
spin_lock_irqsave(&dev->qpt_lock, flags);
for (n = 0; n < dev->qp_table_size; n++) {
qp = rcu_dereference_protected(dev->qp_table[n],
lockdep_is_held(&dev->qpt_lock));
rcu_assign_pointer(dev->qp_table[n], NULL);
for (; qp; qp = rcu_dereference_protected(qp->next,
lockdep_is_held(&dev->qpt_lock)))
qp_inuse++;
}
spin_unlock_irqrestore(&dev->qpt_lock, flags);
synchronize_rcu();
return qp_inuse;
}
/**
* qib_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 qib_qp *qib_lookup_qpn(struct qib_ibport *ibp, u32 qpn)
{
struct qib_qp *qp = NULL;
if (unlikely(qpn <= 1)) {
rcu_read_lock();
if (qpn == 0)
qp = rcu_dereference(ibp->qp0);
else
qp = rcu_dereference(ibp->qp1);
} else {
struct qib_ibdev *dev = &ppd_from_ibp(ibp)->dd->verbs_dev;
unsigned n = qpn_hash(dev, qpn);
rcu_read_lock();
for (qp = rcu_dereference(dev->qp_table[n]); qp;
qp = rcu_dereference(qp->next))
if (qp->ibqp.qp_num == qpn)
break;
}
if (qp)
if (unlikely(!atomic_inc_not_zero(&qp->refcount)))
qp = NULL;
rcu_read_unlock();
return qp;
}
/**
* qib_reset_qp - initialize the QP state to the reset state
* @qp: the QP to reset
* @type: the QP type
*/
static void qib_reset_qp(struct qib_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 &= QIB_S_SIGNAL_REQ_WR;
qp->s_hdrwords = 0;
qp->s_wqe = NULL;
qp->s_draining = 0;
qp->s_next_psn = 0;
qp->s_last_psn = 0;
qp->s_sending_psn = 0;
qp->s_sending_hpsn = 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_head = 0;
qp->s_tail = 0;
qp->s_cur = 0;
qp->s_acked = 0;
qp->s_last = 0;
qp->s_ssn = 1;
qp->s_lsn = 0;
qp->s_mig_state = IB_MIG_MIGRATED;
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;
}
qp->r_sge.num_sge = 0;
}
static void clear_mr_refs(struct qib_qp *qp, int clr_sends)
{
unsigned n;
if (test_and_clear_bit(QIB_R_REWIND_SGE, &qp->r_aflags))
qib_put_ss(&qp->s_rdma_read_sge);
qib_put_ss(&qp->r_sge);
if (clr_sends) {
while (qp->s_last != qp->s_head) {
struct qib_swqe *wqe = get_swqe_ptr(qp, qp->s_last);
unsigned i;
for (i = 0; i < wqe->wr.num_sge; i++) {
struct qib_sge *sge = &wqe->sg_list[i];
qib_put_mr(sge->mr);
}
if (qp->ibqp.qp_type == IB_QPT_UD ||
qp->ibqp.qp_type == IB_QPT_SMI ||
qp->ibqp.qp_type == IB_QPT_GSI)
atomic_dec(&to_iah(wqe->wr.wr.ud.ah)->refcount);
if (++qp->s_last >= qp->s_size)
qp->s_last = 0;
}
if (qp->s_rdma_mr) {
qib_put_mr(qp->s_rdma_mr);
qp->s_rdma_mr = NULL;
}
}
if (qp->ibqp.qp_type != IB_QPT_RC)
return;
for (n = 0; n < ARRAY_SIZE(qp->s_ack_queue); n++) {
struct qib_ack_entry *e = &qp->s_ack_queue[n];
if (e->opcode == IB_OPCODE_RC_RDMA_READ_REQUEST &&
e->rdma_sge.mr) {
qib_put_mr(e->rdma_sge.mr);
e->rdma_sge.mr = NULL;
}
}
}
/**
* qib_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 r_lock and s_lock should be held and interrupts disabled.
* If we are already in error state, just return.
*/
int qib_error_qp(struct qib_qp *qp, enum ib_wc_status err)
{
struct qib_ibdev *dev = to_idev(qp->ibqp.device);
struct ib_wc wc;
int ret = 0;
if (qp->state == IB_QPS_ERR || qp->state == IB_QPS_RESET)
goto bail;
qp->state = IB_QPS_ERR;
if (qp->s_flags & (QIB_S_TIMER | QIB_S_WAIT_RNR)) {
qp->s_flags &= ~(QIB_S_TIMER | QIB_S_WAIT_RNR);
del_timer(&qp->s_timer);
}
if (qp->s_flags & QIB_S_ANY_WAIT_SEND)
qp->s_flags &= ~QIB_S_ANY_WAIT_SEND;
spin_lock(&dev->pending_lock);
if (!list_empty(&qp->iowait) && !(qp->s_flags & QIB_S_BUSY)) {
qp->s_flags &= ~QIB_S_ANY_WAIT_IO;
list_del_init(&qp->iowait);
}
spin_unlock(&dev->pending_lock);
if (!(qp->s_flags & QIB_S_BUSY)) {
qp->s_hdrwords = 0;
if (qp->s_rdma_mr) {
qib_put_mr(qp->s_rdma_mr);
qp->s_rdma_mr = NULL;
}
if (qp->s_tx) {
qib_put_txreq(qp->s_tx);
qp->s_tx = NULL;
}
}
/* Schedule the sending tasklet to drain the send work queue. */
if (qp->s_last != qp->s_head)
qib_schedule_send(qp);
clear_mr_refs(qp, 0);
memset(&wc, 0, sizeof(wc));
wc.qp = &qp->ibqp;
wc.opcode = IB_WC_RECV;
if (test_and_clear_bit(QIB_R_WRID_VALID, &qp->r_aflags)) {
wc.wr_id = qp->r_wr_id;
wc.status = err;
qib_cq_enter(to_icq(qp->ibqp.recv_cq), &wc, 1);
}
wc.status = IB_WC_WR_FLUSH_ERR;
if (qp->r_rq.wq) {
struct qib_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;
qib_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;
}
/**
* qib_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 libibverbs.so
*
* Returns 0 on success, otherwise returns an errno.
*/
int qib_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
int attr_mask, struct ib_udata *udata)
{
struct qib_ibdev *dev = to_idev(ibqp->device);
struct qib_qp *qp = to_iqp(ibqp);
enum ib_qp_state cur_state, new_state;
struct ib_event ev;
int lastwqe = 0;
int mig = 0;
int ret;
u32 pmtu = 0; /* for gcc warning only */
spin_lock_irq(&qp->r_lock);
spin_lock(&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 >= QIB_MULTICAST_LID_BASE)
goto inval;
if (qib_check_ah(qp->ibqp.device, &attr->ah_attr))
goto inval;
}
if (attr_mask & IB_QP_ALT_PATH) {
if (attr->alt_ah_attr.dlid >= QIB_MULTICAST_LID_BASE)
goto inval;
if (qib_check_ah(qp->ibqp.device, &attr->alt_ah_attr))
goto inval;
if (attr->alt_pkey_index >= qib_get_npkeys(dd_from_dev(dev)))
goto inval;
}
if (attr_mask & IB_QP_PKEY_INDEX)
if (attr->pkey_index >= qib_get_npkeys(dd_from_dev(dev)))
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 (qp->ibqp.qp_type == IB_QPT_SMI ||
qp->ibqp.qp_type == IB_QPT_GSI ||
attr->port_num == 0 ||
attr->port_num > ibqp->device->phys_port_cnt)
goto inval;
if (attr_mask & IB_QP_DEST_QPN)
if (attr->dest_qp_num > QIB_QPN_MASK)
goto inval;
if (attr_mask & IB_QP_RETRY_CNT)
if (attr->retry_cnt > 7)
goto inval;
if (attr_mask & IB_QP_RNR_RETRY)
if (attr->rnr_retry > 7)
goto inval;
/*
* Don't allow invalid path_mtu values. OK to set greater
* than the active mtu (or even the max_cap, if we have tuned
* that to a small mtu. We'll set qp->path_mtu
* to the lesser of requested attribute mtu and active,
* for packetizing messages.
* Note that the QP port has to be set in INIT and MTU in RTR.
*/
if (attr_mask & IB_QP_PATH_MTU) {
struct qib_devdata *dd = dd_from_dev(dev);
int mtu, pidx = qp->port_num - 1;
mtu = ib_mtu_enum_to_int(attr->path_mtu);
if (mtu == -1)
goto inval;
if (mtu > dd->pport[pidx].ibmtu) {
switch (dd->pport[pidx].ibmtu) {
case 4096:
pmtu = IB_MTU_4096;
break;
case 2048:
pmtu = IB_MTU_2048;
break;
case 1024:
pmtu = IB_MTU_1024;
break;
case 512:
pmtu = IB_MTU_512;
break;
case 256:
pmtu = IB_MTU_256;
break;
default:
pmtu = IB_MTU_2048;
}
} else
pmtu = attr->path_mtu;
}
if (attr_mask & IB_QP_PATH_MIG_STATE) {
if (attr->path_mig_state == IB_MIG_REARM) {
if (qp->s_mig_state == IB_MIG_ARMED)
goto inval;
if (new_state != IB_QPS_RTS)
goto inval;
} else if (attr->path_mig_state == IB_MIG_MIGRATED) {
if (qp->s_mig_state == IB_MIG_REARM)
goto inval;
if (new_state != IB_QPS_RTS && new_state != IB_QPS_SQD)
goto inval;
if (qp->s_mig_state == IB_MIG_ARMED)
mig = 1;
} else
goto inval;
}
if (attr_mask & IB_QP_MAX_DEST_RD_ATOMIC)
if (attr->max_dest_rd_atomic > QIB_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->iowait))
list_del_init(&qp->iowait);
spin_unlock(&dev->pending_lock);
qp->s_flags &= ~(QIB_S_TIMER | QIB_S_ANY_WAIT);
spin_unlock(&qp->s_lock);
spin_unlock_irq(&qp->r_lock);
/* Stop the sending work queue and retry timer */
cancel_work_sync(&qp->s_work);
del_timer_sync(&qp->s_timer);
wait_event(qp->wait_dma, !atomic_read(&qp->s_dma_busy));
if (qp->s_tx) {
qib_put_txreq(qp->s_tx);
qp->s_tx = NULL;
}
remove_qp(dev, qp);
wait_event(qp->wait, !atomic_read(&qp->refcount));
spin_lock_irq(&qp->r_lock);
spin_lock(&qp->s_lock);
clear_mr_refs(qp, 1);
qib_reset_qp(qp, ibqp->qp_type);
}
break;
case IB_QPS_RTR:
/* Allow event to retrigger if QP set to RTR more than once */
qp->r_flags &= ~QIB_R_COMM_EST;
qp->state = new_state;
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 = qib_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_PORT)
qp->port_num = attr->port_num;
if (attr_mask & IB_QP_DEST_QPN)
qp->remote_qpn = attr->dest_qp_num;
if (attr_mask & IB_QP_SQ_PSN) {
qp->s_next_psn = attr->sq_psn & QIB_PSN_MASK;
qp->s_psn = qp->s_next_psn;
qp->s_sending_psn = qp->s_next_psn;
qp->s_last_psn = qp->s_next_psn - 1;
qp->s_sending_hpsn = qp->s_last_psn;
}
if (attr_mask & IB_QP_RQ_PSN)
qp->r_psn = attr->rq_psn & QIB_PSN_MASK;
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_srate = attr->ah_attr.static_rate;
}
if (attr_mask & IB_QP_ALT_PATH) {
qp->alt_ah_attr = attr->alt_ah_attr;
qp->s_alt_pkey_index = attr->alt_pkey_index;
}
if (attr_mask & IB_QP_PATH_MIG_STATE) {
qp->s_mig_state = attr->path_mig_state;
if (mig) {
qp->remote_ah_attr = qp->alt_ah_attr;
qp->port_num = qp->alt_ah_attr.port_num;
qp->s_pkey_index = qp->s_alt_pkey_index;
}
}
if (attr_mask & IB_QP_PATH_MTU) {
qp->path_mtu = pmtu;
qp->pmtu = ib_mtu_enum_to_int(pmtu);
}
if (attr_mask & IB_QP_RETRY_CNT) {
qp->s_retry_cnt = attr->retry_cnt;
qp->s_retry = attr->retry_cnt;
}
if (attr_mask & IB_QP_RNR_RETRY) {
qp->s_rnr_retry_cnt = attr->rnr_retry;
qp->s_rnr_retry = attr->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;
qp->timeout_jiffies =
usecs_to_jiffies((4096UL * (1UL << qp->timeout)) /
1000UL);
}
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(&qp->s_lock);
spin_unlock_irq(&qp->r_lock);
if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
insert_qp(dev, qp);
if (lastwqe) {
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);
}
if (mig) {
ev.device = qp->ibqp.device;
ev.element.qp = &qp->ibqp;
ev.event = IB_EVENT_PATH_MIG;
qp->ibqp.event_handler(&ev, qp->ibqp.qp_context);
}
ret = 0;
goto bail;
inval:
spin_unlock(&qp->s_lock);
spin_unlock_irq(&qp->r_lock);
ret = -EINVAL;
bail:
return ret;
}
int qib_query_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
int attr_mask, struct ib_qp_init_attr *init_attr)
{
struct qib_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 = qp->s_mig_state;
attr->qkey = qp->qkey;
attr->rq_psn = qp->r_psn & QIB_PSN_MASK;
attr->sq_psn = qp->s_next_psn & QIB_PSN_MASK;
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;
attr->alt_ah_attr = qp->alt_ah_attr;
attr->pkey_index = qp->s_pkey_index;
attr->alt_pkey_index = qp->s_alt_pkey_index;
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 = qp->port_num;
attr->timeout = qp->timeout;
attr->retry_cnt = qp->s_retry_cnt;
attr->rnr_retry = qp->s_rnr_retry_cnt;
attr->alt_port_num = qp->alt_ah_attr.port_num;
attr->alt_timeout = qp->alt_timeout;
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 & QIB_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 = qp->port_num;
return 0;
}
/**
* qib_compute_aeth - compute the AETH (syndrome + MSN)
* @qp: the queue pair to compute the AETH for
*
* Returns the AETH.
*/
__be32 qib_compute_aeth(struct qib_qp *qp)
{
u32 aeth = qp->r_msn & QIB_MSN_MASK;
if (qp->ibqp.srq) {
/*
* Shared receive queues don't generate credits.
* Set the credit field to the invalid value.
*/
aeth |= QIB_AETH_CREDIT_INVAL << QIB_AETH_CREDIT_SHIFT;
} else {
u32 min, max, x;
u32 credits;
struct qib_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 << QIB_AETH_CREDIT_SHIFT;
}
return cpu_to_be32(aeth);
}
/**
* qib_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: user data for libibverbs.so
*
* Returns the queue pair on success, otherwise returns an errno.
*
* Called by the ib_create_qp() core verbs function.
*/
struct ib_qp *qib_create_qp(struct ib_pd *ibpd,
struct ib_qp_init_attr *init_attr,
struct ib_udata *udata)
{
struct qib_qp *qp;
int err;
struct qib_swqe *swq = NULL;
struct qib_ibdev *dev;
struct qib_devdata *dd;
size_t sz;
size_t sg_list_sz;
struct ib_qp *ret;
if (init_attr->cap.max_send_sge > ib_qib_max_sges ||
init_attr->cap.max_send_wr > ib_qib_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_qib_max_sges ||
init_attr->cap.max_recv_wr > ib_qib_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_SMI:
case IB_QPT_GSI:
if (init_attr->port_num == 0 ||
init_attr->port_num > ibpd->device->phys_port_cnt) {
ret = ERR_PTR(-EINVAL);
goto bail;
}
case IB_QPT_UC:
case IB_QPT_RC:
case IB_QPT_UD:
sz = sizeof(struct qib_sge) *
init_attr->cap.max_send_sge +
sizeof(struct qib_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 qib_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 = kzalloc(sz + sg_list_sz, GFP_KERNEL);
if (!qp) {
ret = ERR_PTR(-ENOMEM);
goto bail_swq;
}
RCU_INIT_POINTER(qp->next, NULL);
qp->s_hdr = kzalloc(sizeof(*qp->s_hdr), GFP_KERNEL);
if (!qp->s_hdr) {
ret = ERR_PTR(-ENOMEM);
goto bail_qp;
}
qp->timeout_jiffies =
usecs_to_jiffies((4096UL * (1UL << qp->timeout)) /
1000UL);
if (init_attr->srq)
sz = 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 qib_rwqe);
qp->r_rq.wq = vmalloc_user(sizeof(struct qib_rwq) +
qp->r_rq.size * sz);
if (!qp->r_rq.wq) {
ret = ERR_PTR(-ENOMEM);
goto bail_qp;
}
}
/*
* ib_create_qp() will initialize qp->ibqp
* except for qp->ibqp.qp_num.
*/
spin_lock_init(&qp->r_lock);
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);
init_timer(&qp->s_timer);
qp->s_timer.data = (unsigned long)qp;
INIT_WORK(&qp->s_work, qib_do_send);
INIT_LIST_HEAD(&qp->iowait);
INIT_LIST_HEAD(&qp->rspwait);
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 = QIB_S_SIGNAL_REQ_WR;
dev = to_idev(ibpd->device);
dd = dd_from_dev(dev);
err = alloc_qpn(dd, &dev->qpn_table, init_attr->qp_type,
init_attr->port_num);
if (err < 0) {
ret = ERR_PTR(err);
vfree(qp->r_rq.wq);
goto bail_qp;
}
qp->ibqp.qp_num = err;
qp->port_num = init_attr->port_num;
qib_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 qib_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 qib_rwq) + qp->r_rq.size * sz;
qp->ip = qib_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_qib_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, qib_release_mmap_info);
else
vfree(qp->r_rq.wq);
free_qpn(&dev->qpn_table, qp->ibqp.qp_num);
bail_qp:
kfree(qp->s_hdr);
kfree(qp);
bail_swq:
vfree(swq);
bail:
return ret;
}
/**
* qib_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 qib_destroy_qp(struct ib_qp *ibqp)
{
struct qib_qp *qp = to_iqp(ibqp);
struct qib_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->iowait))
list_del_init(&qp->iowait);
spin_unlock(&dev->pending_lock);
qp->s_flags &= ~(QIB_S_TIMER | QIB_S_ANY_WAIT);
spin_unlock_irq(&qp->s_lock);
cancel_work_sync(&qp->s_work);
del_timer_sync(&qp->s_timer);
wait_event(qp->wait_dma, !atomic_read(&qp->s_dma_busy));
if (qp->s_tx) {
qib_put_txreq(qp->s_tx);
qp->s_tx = NULL;
}
remove_qp(dev, qp);
wait_event(qp->wait, !atomic_read(&qp->refcount));
clear_mr_refs(qp, 1);
} else
spin_unlock_irq(&qp->s_lock);
/* all user's cleaned up, mark it available */
free_qpn(&dev->qpn_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, qib_release_mmap_info);
else
vfree(qp->r_rq.wq);
vfree(qp->s_wq);
kfree(qp->s_hdr);
kfree(qp);
return 0;
}
/**
* qib_init_qpn_table - initialize the QP number table for a device
* @qpt: the QPN table
*/
void qib_init_qpn_table(struct qib_devdata *dd, struct qib_qpn_table *qpt)
{
spin_lock_init(&qpt->lock);
qpt->last = 1; /* start with QPN 2 */
qpt->nmaps = 1;
qpt->mask = dd->qpn_mask;
}
/**
* qib_free_qpn_table - free the QP number table for a device
* @qpt: the QPN table
*/
void qib_free_qpn_table(struct qib_qpn_table *qpt)
{
int i;
for (i = 0; i < ARRAY_SIZE(qpt->map); i++)
if (qpt->map[i].page)
free_page((unsigned long) qpt->map[i].page);
}
/**
* qib_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 qib_get_credit(struct qib_qp *qp, u32 aeth)
{
u32 credit = (aeth >> QIB_AETH_CREDIT_SHIFT) & QIB_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 == QIB_AETH_CREDIT_INVAL) {
if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT)) {
qp->s_flags |= QIB_S_UNLIMITED_CREDIT;
if (qp->s_flags & QIB_S_WAIT_SSN_CREDIT) {
qp->s_flags &= ~QIB_S_WAIT_SSN_CREDIT;
qib_schedule_send(qp);
}
}
} else if (!(qp->s_flags & QIB_S_UNLIMITED_CREDIT)) {
/* Compute new LSN (i.e., MSN + credit) */
credit = (aeth + credit_table[credit]) & QIB_MSN_MASK;
if (qib_cmp24(credit, qp->s_lsn) > 0) {
qp->s_lsn = credit;
if (qp->s_flags & QIB_S_WAIT_SSN_CREDIT) {
qp->s_flags &= ~QIB_S_WAIT_SSN_CREDIT;
qib_schedule_send(qp);
}
}
}
}
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