linux/drivers/infiniband/core/cma.c

1928 lines
45 KiB
C
Raw Normal View History

/*
* Copyright (c) 2005 Voltaire Inc. All rights reserved.
* Copyright (c) 2002-2005, Network Appliance, Inc. All rights reserved.
* Copyright (c) 1999-2005, Mellanox Technologies, Inc. All rights reserved.
* Copyright (c) 2005-2006 Intel Corporation. All rights reserved.
*
* This Software is licensed under one of the following licenses:
*
* 1) under the terms of the "Common Public License 1.0" a copy of which is
* available from the Open Source Initiative, see
* http://www.opensource.org/licenses/cpl.php.
*
* 2) under the terms of the "The BSD License" a copy of which is
* available from the Open Source Initiative, see
* http://www.opensource.org/licenses/bsd-license.php.
*
* 3) under the terms of the "GNU General Public License (GPL) Version 2" a
* copy of which is available from the Open Source Initiative, see
* http://www.opensource.org/licenses/gpl-license.php.
*
* Licensee has the right to choose one of the above licenses.
*
* Redistributions of source code must retain the above copyright
* notice and one of the license notices.
*
* Redistributions in binary form must reproduce both the above copyright
* notice, one of the license notices in the documentation
* and/or other materials provided with the distribution.
*
*/
#include <linux/completion.h>
#include <linux/in.h>
#include <linux/in6.h>
#include <linux/mutex.h>
#include <linux/random.h>
#include <linux/idr.h>
#include <net/tcp.h>
#include <rdma/rdma_cm.h>
#include <rdma/rdma_cm_ib.h>
#include <rdma/ib_cache.h>
#include <rdma/ib_cm.h>
#include <rdma/ib_sa.h>
MODULE_AUTHOR("Sean Hefty");
MODULE_DESCRIPTION("Generic RDMA CM Agent");
MODULE_LICENSE("Dual BSD/GPL");
#define CMA_CM_RESPONSE_TIMEOUT 20
#define CMA_MAX_CM_RETRIES 3
static void cma_add_one(struct ib_device *device);
static void cma_remove_one(struct ib_device *device);
static struct ib_client cma_client = {
.name = "cma",
.add = cma_add_one,
.remove = cma_remove_one
};
static LIST_HEAD(dev_list);
static LIST_HEAD(listen_any_list);
static DEFINE_MUTEX(lock);
static struct workqueue_struct *cma_wq;
static DEFINE_IDR(sdp_ps);
static DEFINE_IDR(tcp_ps);
struct cma_device {
struct list_head list;
struct ib_device *device;
__be64 node_guid;
struct completion comp;
atomic_t refcount;
struct list_head id_list;
};
enum cma_state {
CMA_IDLE,
CMA_ADDR_QUERY,
CMA_ADDR_RESOLVED,
CMA_ROUTE_QUERY,
CMA_ROUTE_RESOLVED,
CMA_CONNECT,
CMA_DISCONNECT,
CMA_ADDR_BOUND,
CMA_LISTEN,
CMA_DEVICE_REMOVAL,
CMA_DESTROYING
};
struct rdma_bind_list {
struct idr *ps;
struct hlist_head owners;
unsigned short port;
};
/*
* Device removal can occur at anytime, so we need extra handling to
* serialize notifying the user of device removal with other callbacks.
* We do this by disabling removal notification while a callback is in process,
* and reporting it after the callback completes.
*/
struct rdma_id_private {
struct rdma_cm_id id;
struct rdma_bind_list *bind_list;
struct hlist_node node;
struct list_head list;
struct list_head listen_list;
struct cma_device *cma_dev;
enum cma_state state;
spinlock_t lock;
struct completion comp;
atomic_t refcount;
wait_queue_head_t wait_remove;
atomic_t dev_remove;
int backlog;
int timeout_ms;
struct ib_sa_query *query;
int query_id;
union {
struct ib_cm_id *ib;
} cm_id;
u32 seq_num;
u32 qp_num;
enum ib_qp_type qp_type;
u8 srq;
};
struct cma_work {
struct work_struct work;
struct rdma_id_private *id;
enum cma_state old_state;
enum cma_state new_state;
struct rdma_cm_event event;
};
union cma_ip_addr {
struct in6_addr ip6;
struct {
__u32 pad[3];
__u32 addr;
} ip4;
};
struct cma_hdr {
u8 cma_version;
u8 ip_version; /* IP version: 7:4 */
__u16 port;
union cma_ip_addr src_addr;
union cma_ip_addr dst_addr;
};
struct sdp_hh {
u8 bsdh[16];
u8 sdp_version; /* Major version: 7:4 */
u8 ip_version; /* IP version: 7:4 */
u8 sdp_specific1[10];
__u16 port;
__u16 sdp_specific2;
union cma_ip_addr src_addr;
union cma_ip_addr dst_addr;
};
struct sdp_hah {
u8 bsdh[16];
u8 sdp_version;
};
#define CMA_VERSION 0x00
#define SDP_MAJ_VERSION 0x2
static int cma_comp(struct rdma_id_private *id_priv, enum cma_state comp)
{
unsigned long flags;
int ret;
spin_lock_irqsave(&id_priv->lock, flags);
ret = (id_priv->state == comp);
spin_unlock_irqrestore(&id_priv->lock, flags);
return ret;
}
static int cma_comp_exch(struct rdma_id_private *id_priv,
enum cma_state comp, enum cma_state exch)
{
unsigned long flags;
int ret;
spin_lock_irqsave(&id_priv->lock, flags);
if ((ret = (id_priv->state == comp)))
id_priv->state = exch;
spin_unlock_irqrestore(&id_priv->lock, flags);
return ret;
}
static enum cma_state cma_exch(struct rdma_id_private *id_priv,
enum cma_state exch)
{
unsigned long flags;
enum cma_state old;
spin_lock_irqsave(&id_priv->lock, flags);
old = id_priv->state;
id_priv->state = exch;
spin_unlock_irqrestore(&id_priv->lock, flags);
return old;
}
static inline u8 cma_get_ip_ver(struct cma_hdr *hdr)
{
return hdr->ip_version >> 4;
}
static inline void cma_set_ip_ver(struct cma_hdr *hdr, u8 ip_ver)
{
hdr->ip_version = (ip_ver << 4) | (hdr->ip_version & 0xF);
}
static inline u8 sdp_get_majv(u8 sdp_version)
{
return sdp_version >> 4;
}
static inline u8 sdp_get_ip_ver(struct sdp_hh *hh)
{
return hh->ip_version >> 4;
}
static inline void sdp_set_ip_ver(struct sdp_hh *hh, u8 ip_ver)
{
hh->ip_version = (ip_ver << 4) | (hh->ip_version & 0xF);
}
static void cma_attach_to_dev(struct rdma_id_private *id_priv,
struct cma_device *cma_dev)
{
atomic_inc(&cma_dev->refcount);
id_priv->cma_dev = cma_dev;
id_priv->id.device = cma_dev->device;
list_add_tail(&id_priv->list, &cma_dev->id_list);
}
static inline void cma_deref_dev(struct cma_device *cma_dev)
{
if (atomic_dec_and_test(&cma_dev->refcount))
complete(&cma_dev->comp);
}
static void cma_detach_from_dev(struct rdma_id_private *id_priv)
{
list_del(&id_priv->list);
cma_deref_dev(id_priv->cma_dev);
id_priv->cma_dev = NULL;
}
static int cma_acquire_ib_dev(struct rdma_id_private *id_priv)
{
struct cma_device *cma_dev;
union ib_gid *gid;
int ret = -ENODEV;
gid = ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr);
mutex_lock(&lock);
list_for_each_entry(cma_dev, &dev_list, list) {
ret = ib_find_cached_gid(cma_dev->device, gid,
&id_priv->id.port_num, NULL);
if (!ret) {
cma_attach_to_dev(id_priv, cma_dev);
break;
}
}
mutex_unlock(&lock);
return ret;
}
static int cma_acquire_dev(struct rdma_id_private *id_priv)
{
switch (id_priv->id.route.addr.dev_addr.dev_type) {
case IB_NODE_CA:
return cma_acquire_ib_dev(id_priv);
default:
return -ENODEV;
}
}
static void cma_deref_id(struct rdma_id_private *id_priv)
{
if (atomic_dec_and_test(&id_priv->refcount))
complete(&id_priv->comp);
}
static void cma_release_remove(struct rdma_id_private *id_priv)
{
if (atomic_dec_and_test(&id_priv->dev_remove))
wake_up(&id_priv->wait_remove);
}
struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler,
void *context, enum rdma_port_space ps)
{
struct rdma_id_private *id_priv;
id_priv = kzalloc(sizeof *id_priv, GFP_KERNEL);
if (!id_priv)
return ERR_PTR(-ENOMEM);
id_priv->state = CMA_IDLE;
id_priv->id.context = context;
id_priv->id.event_handler = event_handler;
id_priv->id.ps = ps;
spin_lock_init(&id_priv->lock);
init_completion(&id_priv->comp);
atomic_set(&id_priv->refcount, 1);
init_waitqueue_head(&id_priv->wait_remove);
atomic_set(&id_priv->dev_remove, 0);
INIT_LIST_HEAD(&id_priv->listen_list);
get_random_bytes(&id_priv->seq_num, sizeof id_priv->seq_num);
return &id_priv->id;
}
EXPORT_SYMBOL(rdma_create_id);
static int cma_init_ib_qp(struct rdma_id_private *id_priv, struct ib_qp *qp)
{
struct ib_qp_attr qp_attr;
struct rdma_dev_addr *dev_addr;
int ret;
dev_addr = &id_priv->id.route.addr.dev_addr;
ret = ib_find_cached_pkey(id_priv->id.device, id_priv->id.port_num,
ib_addr_get_pkey(dev_addr),
&qp_attr.pkey_index);
if (ret)
return ret;
qp_attr.qp_state = IB_QPS_INIT;
qp_attr.qp_access_flags = IB_ACCESS_LOCAL_WRITE;
qp_attr.port_num = id_priv->id.port_num;
return ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_ACCESS_FLAGS |
IB_QP_PKEY_INDEX | IB_QP_PORT);
}
int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd,
struct ib_qp_init_attr *qp_init_attr)
{
struct rdma_id_private *id_priv;
struct ib_qp *qp;
int ret;
id_priv = container_of(id, struct rdma_id_private, id);
if (id->device != pd->device)
return -EINVAL;
qp = ib_create_qp(pd, qp_init_attr);
if (IS_ERR(qp))
return PTR_ERR(qp);
switch (id->device->node_type) {
case IB_NODE_CA:
ret = cma_init_ib_qp(id_priv, qp);
break;
default:
ret = -ENOSYS;
break;
}
if (ret)
goto err;
id->qp = qp;
id_priv->qp_num = qp->qp_num;
id_priv->qp_type = qp->qp_type;
id_priv->srq = (qp->srq != NULL);
return 0;
err:
ib_destroy_qp(qp);
return ret;
}
EXPORT_SYMBOL(rdma_create_qp);
void rdma_destroy_qp(struct rdma_cm_id *id)
{
ib_destroy_qp(id->qp);
}
EXPORT_SYMBOL(rdma_destroy_qp);
static int cma_modify_qp_rtr(struct rdma_cm_id *id)
{
struct ib_qp_attr qp_attr;
int qp_attr_mask, ret;
if (!id->qp)
return 0;
/* Need to update QP attributes from default values. */
qp_attr.qp_state = IB_QPS_INIT;
ret = rdma_init_qp_attr(id, &qp_attr, &qp_attr_mask);
if (ret)
return ret;
ret = ib_modify_qp(id->qp, &qp_attr, qp_attr_mask);
if (ret)
return ret;
qp_attr.qp_state = IB_QPS_RTR;
ret = rdma_init_qp_attr(id, &qp_attr, &qp_attr_mask);
if (ret)
return ret;
return ib_modify_qp(id->qp, &qp_attr, qp_attr_mask);
}
static int cma_modify_qp_rts(struct rdma_cm_id *id)
{
struct ib_qp_attr qp_attr;
int qp_attr_mask, ret;
if (!id->qp)
return 0;
qp_attr.qp_state = IB_QPS_RTS;
ret = rdma_init_qp_attr(id, &qp_attr, &qp_attr_mask);
if (ret)
return ret;
return ib_modify_qp(id->qp, &qp_attr, qp_attr_mask);
}
static int cma_modify_qp_err(struct rdma_cm_id *id)
{
struct ib_qp_attr qp_attr;
if (!id->qp)
return 0;
qp_attr.qp_state = IB_QPS_ERR;
return ib_modify_qp(id->qp, &qp_attr, IB_QP_STATE);
}
int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr,
int *qp_attr_mask)
{
struct rdma_id_private *id_priv;
int ret;
id_priv = container_of(id, struct rdma_id_private, id);
switch (id_priv->id.device->node_type) {
case IB_NODE_CA:
ret = ib_cm_init_qp_attr(id_priv->cm_id.ib, qp_attr,
qp_attr_mask);
if (qp_attr->qp_state == IB_QPS_RTR)
qp_attr->rq_psn = id_priv->seq_num;
break;
default:
ret = -ENOSYS;
break;
}
return ret;
}
EXPORT_SYMBOL(rdma_init_qp_attr);
static inline int cma_zero_addr(struct sockaddr *addr)
{
struct in6_addr *ip6;
if (addr->sa_family == AF_INET)
return ZERONET(((struct sockaddr_in *) addr)->sin_addr.s_addr);
else {
ip6 = &((struct sockaddr_in6 *) addr)->sin6_addr;
return (ip6->s6_addr32[0] | ip6->s6_addr32[1] |
ip6->s6_addr32[3] | ip6->s6_addr32[4]) == 0;
}
}
static inline int cma_loopback_addr(struct sockaddr *addr)
{
return LOOPBACK(((struct sockaddr_in *) addr)->sin_addr.s_addr);
}
static inline int cma_any_addr(struct sockaddr *addr)
{
return cma_zero_addr(addr) || cma_loopback_addr(addr);
}
static inline int cma_any_port(struct sockaddr *addr)
{
return !((struct sockaddr_in *) addr)->sin_port;
}
static int cma_get_net_info(void *hdr, enum rdma_port_space ps,
u8 *ip_ver, __u16 *port,
union cma_ip_addr **src, union cma_ip_addr **dst)
{
switch (ps) {
case RDMA_PS_SDP:
if (sdp_get_majv(((struct sdp_hh *) hdr)->sdp_version) !=
SDP_MAJ_VERSION)
return -EINVAL;
*ip_ver = sdp_get_ip_ver(hdr);
*port = ((struct sdp_hh *) hdr)->port;
*src = &((struct sdp_hh *) hdr)->src_addr;
*dst = &((struct sdp_hh *) hdr)->dst_addr;
break;
default:
if (((struct cma_hdr *) hdr)->cma_version != CMA_VERSION)
return -EINVAL;
*ip_ver = cma_get_ip_ver(hdr);
*port = ((struct cma_hdr *) hdr)->port;
*src = &((struct cma_hdr *) hdr)->src_addr;
*dst = &((struct cma_hdr *) hdr)->dst_addr;
break;
}
if (*ip_ver != 4 && *ip_ver != 6)
return -EINVAL;
return 0;
}
static void cma_save_net_info(struct rdma_addr *addr,
struct rdma_addr *listen_addr,
u8 ip_ver, __u16 port,
union cma_ip_addr *src, union cma_ip_addr *dst)
{
struct sockaddr_in *listen4, *ip4;
struct sockaddr_in6 *listen6, *ip6;
switch (ip_ver) {
case 4:
listen4 = (struct sockaddr_in *) &listen_addr->src_addr;
ip4 = (struct sockaddr_in *) &addr->src_addr;
ip4->sin_family = listen4->sin_family;
ip4->sin_addr.s_addr = dst->ip4.addr;
ip4->sin_port = listen4->sin_port;
ip4 = (struct sockaddr_in *) &addr->dst_addr;
ip4->sin_family = listen4->sin_family;
ip4->sin_addr.s_addr = src->ip4.addr;
ip4->sin_port = port;
break;
case 6:
listen6 = (struct sockaddr_in6 *) &listen_addr->src_addr;
ip6 = (struct sockaddr_in6 *) &addr->src_addr;
ip6->sin6_family = listen6->sin6_family;
ip6->sin6_addr = dst->ip6;
ip6->sin6_port = listen6->sin6_port;
ip6 = (struct sockaddr_in6 *) &addr->dst_addr;
ip6->sin6_family = listen6->sin6_family;
ip6->sin6_addr = src->ip6;
ip6->sin6_port = port;
break;
default:
break;
}
}
static inline int cma_user_data_offset(enum rdma_port_space ps)
{
switch (ps) {
case RDMA_PS_SDP:
return 0;
default:
return sizeof(struct cma_hdr);
}
}
static int cma_notify_user(struct rdma_id_private *id_priv,
enum rdma_cm_event_type type, int status,
void *data, u8 data_len)
{
struct rdma_cm_event event;
event.event = type;
event.status = status;
event.private_data = data;
event.private_data_len = data_len;
return id_priv->id.event_handler(&id_priv->id, &event);
}
static void cma_cancel_route(struct rdma_id_private *id_priv)
{
switch (id_priv->id.device->node_type) {
case IB_NODE_CA:
if (id_priv->query)
ib_sa_cancel_query(id_priv->query_id, id_priv->query);
break;
default:
break;
}
}
static inline int cma_internal_listen(struct rdma_id_private *id_priv)
{
return (id_priv->state == CMA_LISTEN) && id_priv->cma_dev &&
cma_any_addr(&id_priv->id.route.addr.src_addr);
}
static void cma_destroy_listen(struct rdma_id_private *id_priv)
{
cma_exch(id_priv, CMA_DESTROYING);
if (id_priv->cma_dev) {
switch (id_priv->id.device->node_type) {
case IB_NODE_CA:
if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
ib_destroy_cm_id(id_priv->cm_id.ib);
break;
default:
break;
}
cma_detach_from_dev(id_priv);
}
list_del(&id_priv->listen_list);
cma_deref_id(id_priv);
wait_for_completion(&id_priv->comp);
kfree(id_priv);
}
static void cma_cancel_listens(struct rdma_id_private *id_priv)
{
struct rdma_id_private *dev_id_priv;
mutex_lock(&lock);
list_del(&id_priv->list);
while (!list_empty(&id_priv->listen_list)) {
dev_id_priv = list_entry(id_priv->listen_list.next,
struct rdma_id_private, listen_list);
cma_destroy_listen(dev_id_priv);
}
mutex_unlock(&lock);
}
static void cma_cancel_operation(struct rdma_id_private *id_priv,
enum cma_state state)
{
switch (state) {
case CMA_ADDR_QUERY:
rdma_addr_cancel(&id_priv->id.route.addr.dev_addr);
break;
case CMA_ROUTE_QUERY:
cma_cancel_route(id_priv);
break;
case CMA_LISTEN:
if (cma_any_addr(&id_priv->id.route.addr.src_addr) &&
!id_priv->cma_dev)
cma_cancel_listens(id_priv);
break;
default:
break;
}
}
static void cma_release_port(struct rdma_id_private *id_priv)
{
struct rdma_bind_list *bind_list = id_priv->bind_list;
if (!bind_list)
return;
mutex_lock(&lock);
hlist_del(&id_priv->node);
if (hlist_empty(&bind_list->owners)) {
idr_remove(bind_list->ps, bind_list->port);
kfree(bind_list);
}
mutex_unlock(&lock);
}
void rdma_destroy_id(struct rdma_cm_id *id)
{
struct rdma_id_private *id_priv;
enum cma_state state;
id_priv = container_of(id, struct rdma_id_private, id);
state = cma_exch(id_priv, CMA_DESTROYING);
cma_cancel_operation(id_priv, state);
if (id_priv->cma_dev) {
switch (id->device->node_type) {
case IB_NODE_CA:
if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib))
ib_destroy_cm_id(id_priv->cm_id.ib);
break;
default:
break;
}
mutex_lock(&lock);
cma_detach_from_dev(id_priv);
mutex_unlock(&lock);
}
cma_release_port(id_priv);
cma_deref_id(id_priv);
wait_for_completion(&id_priv->comp);
kfree(id_priv->id.route.path_rec);
kfree(id_priv);
}
EXPORT_SYMBOL(rdma_destroy_id);
static int cma_rep_recv(struct rdma_id_private *id_priv)
{
int ret;
ret = cma_modify_qp_rtr(&id_priv->id);
if (ret)
goto reject;
ret = cma_modify_qp_rts(&id_priv->id);
if (ret)
goto reject;
ret = ib_send_cm_rtu(id_priv->cm_id.ib, NULL, 0);
if (ret)
goto reject;
return 0;
reject:
cma_modify_qp_err(&id_priv->id);
ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
NULL, 0, NULL, 0);
return ret;
}
static int cma_verify_rep(struct rdma_id_private *id_priv, void *data)
{
if (id_priv->id.ps == RDMA_PS_SDP &&
sdp_get_majv(((struct sdp_hah *) data)->sdp_version) !=
SDP_MAJ_VERSION)
return -EINVAL;
return 0;
}
static int cma_rtu_recv(struct rdma_id_private *id_priv)
{
int ret;
ret = cma_modify_qp_rts(&id_priv->id);
if (ret)
goto reject;
return 0;
reject:
cma_modify_qp_err(&id_priv->id);
ib_send_cm_rej(id_priv->cm_id.ib, IB_CM_REJ_CONSUMER_DEFINED,
NULL, 0, NULL, 0);
return ret;
}
static int cma_ib_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
{
struct rdma_id_private *id_priv = cm_id->context;
enum rdma_cm_event_type event;
u8 private_data_len = 0;
int ret = 0, status = 0;
atomic_inc(&id_priv->dev_remove);
if (!cma_comp(id_priv, CMA_CONNECT))
goto out;
switch (ib_event->event) {
case IB_CM_REQ_ERROR:
case IB_CM_REP_ERROR:
event = RDMA_CM_EVENT_UNREACHABLE;
status = -ETIMEDOUT;
break;
case IB_CM_REP_RECEIVED:
status = cma_verify_rep(id_priv, ib_event->private_data);
if (status)
event = RDMA_CM_EVENT_CONNECT_ERROR;
else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) {
status = cma_rep_recv(id_priv);
event = status ? RDMA_CM_EVENT_CONNECT_ERROR :
RDMA_CM_EVENT_ESTABLISHED;
} else
event = RDMA_CM_EVENT_CONNECT_RESPONSE;
private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE;
break;
case IB_CM_RTU_RECEIVED:
status = cma_rtu_recv(id_priv);
event = status ? RDMA_CM_EVENT_CONNECT_ERROR :
RDMA_CM_EVENT_ESTABLISHED;
break;
case IB_CM_DREQ_ERROR:
status = -ETIMEDOUT; /* fall through */
case IB_CM_DREQ_RECEIVED:
case IB_CM_DREP_RECEIVED:
if (!cma_comp_exch(id_priv, CMA_CONNECT, CMA_DISCONNECT))
goto out;
event = RDMA_CM_EVENT_DISCONNECTED;
break;
case IB_CM_TIMEWAIT_EXIT:
case IB_CM_MRA_RECEIVED:
/* ignore event */
goto out;
case IB_CM_REJ_RECEIVED:
cma_modify_qp_err(&id_priv->id);
status = ib_event->param.rej_rcvd.reason;
event = RDMA_CM_EVENT_REJECTED;
break;
default:
printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d",
ib_event->event);
goto out;
}
ret = cma_notify_user(id_priv, event, status, ib_event->private_data,
private_data_len);
if (ret) {
/* Destroy the CM ID by returning a non-zero value. */
id_priv->cm_id.ib = NULL;
cma_exch(id_priv, CMA_DESTROYING);
cma_release_remove(id_priv);
rdma_destroy_id(&id_priv->id);
return ret;
}
out:
cma_release_remove(id_priv);
return ret;
}
static struct rdma_id_private *cma_new_id(struct rdma_cm_id *listen_id,
struct ib_cm_event *ib_event)
{
struct rdma_id_private *id_priv;
struct rdma_cm_id *id;
struct rdma_route *rt;
union cma_ip_addr *src, *dst;
__u16 port;
u8 ip_ver;
id = rdma_create_id(listen_id->event_handler, listen_id->context,
listen_id->ps);
if (IS_ERR(id))
return NULL;
rt = &id->route;
rt->num_paths = ib_event->param.req_rcvd.alternate_path ? 2 : 1;
rt->path_rec = kmalloc(sizeof *rt->path_rec * rt->num_paths, GFP_KERNEL);
if (!rt->path_rec)
goto err;
if (cma_get_net_info(ib_event->private_data, listen_id->ps,
&ip_ver, &port, &src, &dst))
goto err;
cma_save_net_info(&id->route.addr, &listen_id->route.addr,
ip_ver, port, src, dst);
rt->path_rec[0] = *ib_event->param.req_rcvd.primary_path;
if (rt->num_paths == 2)
rt->path_rec[1] = *ib_event->param.req_rcvd.alternate_path;
ib_addr_set_sgid(&rt->addr.dev_addr, &rt->path_rec[0].sgid);
ib_addr_set_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid);
ib_addr_set_pkey(&rt->addr.dev_addr, be16_to_cpu(rt->path_rec[0].pkey));
rt->addr.dev_addr.dev_type = IB_NODE_CA;
id_priv = container_of(id, struct rdma_id_private, id);
id_priv->state = CMA_CONNECT;
return id_priv;
err:
rdma_destroy_id(id);
return NULL;
}
static int cma_req_handler(struct ib_cm_id *cm_id, struct ib_cm_event *ib_event)
{
struct rdma_id_private *listen_id, *conn_id;
int offset, ret;
listen_id = cm_id->context;
atomic_inc(&listen_id->dev_remove);
if (!cma_comp(listen_id, CMA_LISTEN)) {
ret = -ECONNABORTED;
goto out;
}
conn_id = cma_new_id(&listen_id->id, ib_event);
if (!conn_id) {
ret = -ENOMEM;
goto out;
}
atomic_inc(&conn_id->dev_remove);
ret = cma_acquire_ib_dev(conn_id);
if (ret) {
ret = -ENODEV;
cma_release_remove(conn_id);
rdma_destroy_id(&conn_id->id);
goto out;
}
conn_id->cm_id.ib = cm_id;
cm_id->context = conn_id;
cm_id->cm_handler = cma_ib_handler;
offset = cma_user_data_offset(listen_id->id.ps);
ret = cma_notify_user(conn_id, RDMA_CM_EVENT_CONNECT_REQUEST, 0,
ib_event->private_data + offset,
IB_CM_REQ_PRIVATE_DATA_SIZE - offset);
if (ret) {
/* Destroy the CM ID by returning a non-zero value. */
conn_id->cm_id.ib = NULL;
cma_exch(conn_id, CMA_DESTROYING);
cma_release_remove(conn_id);
rdma_destroy_id(&conn_id->id);
}
out:
cma_release_remove(listen_id);
return ret;
}
static __be64 cma_get_service_id(enum rdma_port_space ps, struct sockaddr *addr)
{
return cpu_to_be64(((u64)ps << 16) +
be16_to_cpu(((struct sockaddr_in *) addr)->sin_port));
}
static void cma_set_compare_data(enum rdma_port_space ps, struct sockaddr *addr,
struct ib_cm_compare_data *compare)
{
struct cma_hdr *cma_data, *cma_mask;
struct sdp_hh *sdp_data, *sdp_mask;
__u32 ip4_addr;
struct in6_addr ip6_addr;
memset(compare, 0, sizeof *compare);
cma_data = (void *) compare->data;
cma_mask = (void *) compare->mask;
sdp_data = (void *) compare->data;
sdp_mask = (void *) compare->mask;
switch (addr->sa_family) {
case AF_INET:
ip4_addr = ((struct sockaddr_in *) addr)->sin_addr.s_addr;
if (ps == RDMA_PS_SDP) {
sdp_set_ip_ver(sdp_data, 4);
sdp_set_ip_ver(sdp_mask, 0xF);
sdp_data->dst_addr.ip4.addr = ip4_addr;
sdp_mask->dst_addr.ip4.addr = ~0;
} else {
cma_set_ip_ver(cma_data, 4);
cma_set_ip_ver(cma_mask, 0xF);
cma_data->dst_addr.ip4.addr = ip4_addr;
cma_mask->dst_addr.ip4.addr = ~0;
}
break;
case AF_INET6:
ip6_addr = ((struct sockaddr_in6 *) addr)->sin6_addr;
if (ps == RDMA_PS_SDP) {
sdp_set_ip_ver(sdp_data, 6);
sdp_set_ip_ver(sdp_mask, 0xF);
sdp_data->dst_addr.ip6 = ip6_addr;
memset(&sdp_mask->dst_addr.ip6, 0xFF,
sizeof sdp_mask->dst_addr.ip6);
} else {
cma_set_ip_ver(cma_data, 6);
cma_set_ip_ver(cma_mask, 0xF);
cma_data->dst_addr.ip6 = ip6_addr;
memset(&cma_mask->dst_addr.ip6, 0xFF,
sizeof cma_mask->dst_addr.ip6);
}
break;
default:
break;
}
}
static int cma_ib_listen(struct rdma_id_private *id_priv)
{
struct ib_cm_compare_data compare_data;
struct sockaddr *addr;
__be64 svc_id;
int ret;
id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_req_handler,
id_priv);
if (IS_ERR(id_priv->cm_id.ib))
return PTR_ERR(id_priv->cm_id.ib);
addr = &id_priv->id.route.addr.src_addr;
svc_id = cma_get_service_id(id_priv->id.ps, addr);
if (cma_any_addr(addr))
ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, NULL);
else {
cma_set_compare_data(id_priv->id.ps, addr, &compare_data);
ret = ib_cm_listen(id_priv->cm_id.ib, svc_id, 0, &compare_data);
}
if (ret) {
ib_destroy_cm_id(id_priv->cm_id.ib);
id_priv->cm_id.ib = NULL;
}
return ret;
}
static int cma_listen_handler(struct rdma_cm_id *id,
struct rdma_cm_event *event)
{
struct rdma_id_private *id_priv = id->context;
id->context = id_priv->id.context;
id->event_handler = id_priv->id.event_handler;
return id_priv->id.event_handler(id, event);
}
static void cma_listen_on_dev(struct rdma_id_private *id_priv,
struct cma_device *cma_dev)
{
struct rdma_id_private *dev_id_priv;
struct rdma_cm_id *id;
int ret;
id = rdma_create_id(cma_listen_handler, id_priv, id_priv->id.ps);
if (IS_ERR(id))
return;
dev_id_priv = container_of(id, struct rdma_id_private, id);
dev_id_priv->state = CMA_ADDR_BOUND;
memcpy(&id->route.addr.src_addr, &id_priv->id.route.addr.src_addr,
ip_addr_size(&id_priv->id.route.addr.src_addr));
cma_attach_to_dev(dev_id_priv, cma_dev);
list_add_tail(&dev_id_priv->listen_list, &id_priv->listen_list);
ret = rdma_listen(id, id_priv->backlog);
if (ret)
goto err;
return;
err:
cma_destroy_listen(dev_id_priv);
}
static void cma_listen_on_all(struct rdma_id_private *id_priv)
{
struct cma_device *cma_dev;
mutex_lock(&lock);
list_add_tail(&id_priv->list, &listen_any_list);
list_for_each_entry(cma_dev, &dev_list, list)
cma_listen_on_dev(id_priv, cma_dev);
mutex_unlock(&lock);
}
static int cma_bind_any(struct rdma_cm_id *id, sa_family_t af)
{
struct sockaddr_in addr_in;
memset(&addr_in, 0, sizeof addr_in);
addr_in.sin_family = af;
return rdma_bind_addr(id, (struct sockaddr *) &addr_in);
}
int rdma_listen(struct rdma_cm_id *id, int backlog)
{
struct rdma_id_private *id_priv;
int ret;
id_priv = container_of(id, struct rdma_id_private, id);
if (id_priv->state == CMA_IDLE) {
ret = cma_bind_any(id, AF_INET);
if (ret)
return ret;
}
if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_LISTEN))
return -EINVAL;
id_priv->backlog = backlog;
if (id->device) {
switch (id->device->node_type) {
case IB_NODE_CA:
ret = cma_ib_listen(id_priv);
if (ret)
goto err;
break;
default:
ret = -ENOSYS;
goto err;
}
} else
cma_listen_on_all(id_priv);
return 0;
err:
id_priv->backlog = 0;
cma_comp_exch(id_priv, CMA_LISTEN, CMA_ADDR_BOUND);
return ret;
}
EXPORT_SYMBOL(rdma_listen);
static void cma_query_handler(int status, struct ib_sa_path_rec *path_rec,
void *context)
{
struct cma_work *work = context;
struct rdma_route *route;
route = &work->id->id.route;
if (!status) {
route->num_paths = 1;
*route->path_rec = *path_rec;
} else {
work->old_state = CMA_ROUTE_QUERY;
work->new_state = CMA_ADDR_RESOLVED;
work->event.event = RDMA_CM_EVENT_ROUTE_ERROR;
}
queue_work(cma_wq, &work->work);
}
static int cma_query_ib_route(struct rdma_id_private *id_priv, int timeout_ms,
struct cma_work *work)
{
struct rdma_dev_addr *addr = &id_priv->id.route.addr.dev_addr;
struct ib_sa_path_rec path_rec;
memset(&path_rec, 0, sizeof path_rec);
path_rec.sgid = *ib_addr_get_sgid(addr);
path_rec.dgid = *ib_addr_get_dgid(addr);
path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(addr));
path_rec.numb_path = 1;
id_priv->query_id = ib_sa_path_rec_get(id_priv->id.device,
id_priv->id.port_num, &path_rec,
IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID |
IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH,
timeout_ms, GFP_KERNEL,
cma_query_handler, work, &id_priv->query);
return (id_priv->query_id < 0) ? id_priv->query_id : 0;
}
static void cma_work_handler(void *data)
{
struct cma_work *work = data;
struct rdma_id_private *id_priv = work->id;
int destroy = 0;
atomic_inc(&id_priv->dev_remove);
if (!cma_comp_exch(id_priv, work->old_state, work->new_state))
goto out;
if (id_priv->id.event_handler(&id_priv->id, &work->event)) {
cma_exch(id_priv, CMA_DESTROYING);
destroy = 1;
}
out:
cma_release_remove(id_priv);
cma_deref_id(id_priv);
if (destroy)
rdma_destroy_id(&id_priv->id);
kfree(work);
}
static int cma_resolve_ib_route(struct rdma_id_private *id_priv, int timeout_ms)
{
struct rdma_route *route = &id_priv->id.route;
struct cma_work *work;
int ret;
work = kzalloc(sizeof *work, GFP_KERNEL);
if (!work)
return -ENOMEM;
work->id = id_priv;
INIT_WORK(&work->work, cma_work_handler, work);
work->old_state = CMA_ROUTE_QUERY;
work->new_state = CMA_ROUTE_RESOLVED;
work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED;
route->path_rec = kmalloc(sizeof *route->path_rec, GFP_KERNEL);
if (!route->path_rec) {
ret = -ENOMEM;
goto err1;
}
ret = cma_query_ib_route(id_priv, timeout_ms, work);
if (ret)
goto err2;
return 0;
err2:
kfree(route->path_rec);
route->path_rec = NULL;
err1:
kfree(work);
return ret;
}
int rdma_set_ib_paths(struct rdma_cm_id *id,
struct ib_sa_path_rec *path_rec, int num_paths)
{
struct rdma_id_private *id_priv;
int ret;
id_priv = container_of(id, struct rdma_id_private, id);
if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_RESOLVED))
return -EINVAL;
id->route.path_rec = kmalloc(sizeof *path_rec * num_paths, GFP_KERNEL);
if (!id->route.path_rec) {
ret = -ENOMEM;
goto err;
}
memcpy(id->route.path_rec, path_rec, sizeof *path_rec * num_paths);
return 0;
err:
cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_ADDR_RESOLVED);
return ret;
}
EXPORT_SYMBOL(rdma_set_ib_paths);
int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms)
{
struct rdma_id_private *id_priv;
int ret;
id_priv = container_of(id, struct rdma_id_private, id);
if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ROUTE_QUERY))
return -EINVAL;
atomic_inc(&id_priv->refcount);
switch (id->device->node_type) {
case IB_NODE_CA:
ret = cma_resolve_ib_route(id_priv, timeout_ms);
break;
default:
ret = -ENOSYS;
break;
}
if (ret)
goto err;
return 0;
err:
cma_comp_exch(id_priv, CMA_ROUTE_QUERY, CMA_ADDR_RESOLVED);
cma_deref_id(id_priv);
return ret;
}
EXPORT_SYMBOL(rdma_resolve_route);
static int cma_bind_loopback(struct rdma_id_private *id_priv)
{
struct cma_device *cma_dev;
struct ib_port_attr port_attr;
union ib_gid *gid;
u16 pkey;
int ret;
u8 p;
mutex_lock(&lock);
list_for_each_entry(cma_dev, &dev_list, list)
for (p = 1; p <= cma_dev->device->phys_port_cnt; ++p)
if (!ib_query_port (cma_dev->device, p, &port_attr) &&
port_attr.state == IB_PORT_ACTIVE)
goto port_found;
if (!list_empty(&dev_list)) {
p = 1;
cma_dev = list_entry(dev_list.next, struct cma_device, list);
} else {
ret = -ENODEV;
goto out;
}
port_found:
gid = ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr);
ret = ib_get_cached_gid(cma_dev->device, p, 0, gid);
if (ret)
goto out;
ret = ib_get_cached_pkey(cma_dev->device, p, 0, &pkey);
if (ret)
goto out;
ib_addr_set_pkey(&id_priv->id.route.addr.dev_addr, pkey);
id_priv->id.port_num = p;
cma_attach_to_dev(id_priv, cma_dev);
out:
mutex_unlock(&lock);
return ret;
}
static void addr_handler(int status, struct sockaddr *src_addr,
struct rdma_dev_addr *dev_addr, void *context)
{
struct rdma_id_private *id_priv = context;
enum rdma_cm_event_type event;
atomic_inc(&id_priv->dev_remove);
if (!id_priv->cma_dev && !status)
status = cma_acquire_dev(id_priv);
if (status) {
if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND))
goto out;
event = RDMA_CM_EVENT_ADDR_ERROR;
} else {
if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED))
goto out;
memcpy(&id_priv->id.route.addr.src_addr, src_addr,
ip_addr_size(src_addr));
event = RDMA_CM_EVENT_ADDR_RESOLVED;
}
if (cma_notify_user(id_priv, event, status, NULL, 0)) {
cma_exch(id_priv, CMA_DESTROYING);
cma_release_remove(id_priv);
cma_deref_id(id_priv);
rdma_destroy_id(&id_priv->id);
return;
}
out:
cma_release_remove(id_priv);
cma_deref_id(id_priv);
}
static int cma_resolve_loopback(struct rdma_id_private *id_priv)
{
struct cma_work *work;
struct sockaddr_in *src_in, *dst_in;
int ret;
work = kzalloc(sizeof *work, GFP_KERNEL);
if (!work)
return -ENOMEM;
if (!id_priv->cma_dev) {
ret = cma_bind_loopback(id_priv);
if (ret)
goto err;
}
ib_addr_set_dgid(&id_priv->id.route.addr.dev_addr,
ib_addr_get_sgid(&id_priv->id.route.addr.dev_addr));
if (cma_zero_addr(&id_priv->id.route.addr.src_addr)) {
src_in = (struct sockaddr_in *)&id_priv->id.route.addr.src_addr;
dst_in = (struct sockaddr_in *)&id_priv->id.route.addr.dst_addr;
src_in->sin_family = dst_in->sin_family;
src_in->sin_addr.s_addr = dst_in->sin_addr.s_addr;
}
work->id = id_priv;
INIT_WORK(&work->work, cma_work_handler, work);
work->old_state = CMA_ADDR_QUERY;
work->new_state = CMA_ADDR_RESOLVED;
work->event.event = RDMA_CM_EVENT_ADDR_RESOLVED;
queue_work(cma_wq, &work->work);
return 0;
err:
kfree(work);
return ret;
}
static int cma_bind_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
struct sockaddr *dst_addr)
{
if (src_addr && src_addr->sa_family)
return rdma_bind_addr(id, src_addr);
else
return cma_bind_any(id, dst_addr->sa_family);
}
int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr,
struct sockaddr *dst_addr, int timeout_ms)
{
struct rdma_id_private *id_priv;
int ret;
id_priv = container_of(id, struct rdma_id_private, id);
if (id_priv->state == CMA_IDLE) {
ret = cma_bind_addr(id, src_addr, dst_addr);
if (ret)
return ret;
}
if (!cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_ADDR_QUERY))
return -EINVAL;
atomic_inc(&id_priv->refcount);
memcpy(&id->route.addr.dst_addr, dst_addr, ip_addr_size(dst_addr));
if (cma_any_addr(dst_addr))
ret = cma_resolve_loopback(id_priv);
else
ret = rdma_resolve_ip(&id->route.addr.src_addr, dst_addr,
&id->route.addr.dev_addr,
timeout_ms, addr_handler, id_priv);
if (ret)
goto err;
return 0;
err:
cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_BOUND);
cma_deref_id(id_priv);
return ret;
}
EXPORT_SYMBOL(rdma_resolve_addr);
static void cma_bind_port(struct rdma_bind_list *bind_list,
struct rdma_id_private *id_priv)
{
struct sockaddr_in *sin;
sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
sin->sin_port = htons(bind_list->port);
id_priv->bind_list = bind_list;
hlist_add_head(&id_priv->node, &bind_list->owners);
}
static int cma_alloc_port(struct idr *ps, struct rdma_id_private *id_priv,
unsigned short snum)
{
struct rdma_bind_list *bind_list;
int port, start, ret;
bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL);
if (!bind_list)
return -ENOMEM;
start = snum ? snum : sysctl_local_port_range[0];
do {
ret = idr_get_new_above(ps, bind_list, start, &port);
} while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL));
if (ret)
goto err;
if ((snum && port != snum) ||
(!snum && port > sysctl_local_port_range[1])) {
idr_remove(ps, port);
ret = -EADDRNOTAVAIL;
goto err;
}
bind_list->ps = ps;
bind_list->port = (unsigned short) port;
cma_bind_port(bind_list, id_priv);
return 0;
err:
kfree(bind_list);
return ret;
}
static int cma_use_port(struct idr *ps, struct rdma_id_private *id_priv)
{
struct rdma_id_private *cur_id;
struct sockaddr_in *sin, *cur_sin;
struct rdma_bind_list *bind_list;
struct hlist_node *node;
unsigned short snum;
sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr;
snum = ntohs(sin->sin_port);
if (snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
return -EACCES;
bind_list = idr_find(ps, snum);
if (!bind_list)
return cma_alloc_port(ps, id_priv, snum);
/*
* We don't support binding to any address if anyone is bound to
* a specific address on the same port.
*/
if (cma_any_addr(&id_priv->id.route.addr.src_addr))
return -EADDRNOTAVAIL;
hlist_for_each_entry(cur_id, node, &bind_list->owners, node) {
if (cma_any_addr(&cur_id->id.route.addr.src_addr))
return -EADDRNOTAVAIL;
cur_sin = (struct sockaddr_in *) &cur_id->id.route.addr.src_addr;
if (sin->sin_addr.s_addr == cur_sin->sin_addr.s_addr)
return -EADDRINUSE;
}
cma_bind_port(bind_list, id_priv);
return 0;
}
static int cma_get_port(struct rdma_id_private *id_priv)
{
struct idr *ps;
int ret;
switch (id_priv->id.ps) {
case RDMA_PS_SDP:
ps = &sdp_ps;
break;
case RDMA_PS_TCP:
ps = &tcp_ps;
break;
default:
return -EPROTONOSUPPORT;
}
mutex_lock(&lock);
if (cma_any_port(&id_priv->id.route.addr.src_addr))
ret = cma_alloc_port(ps, id_priv, 0);
else
ret = cma_use_port(ps, id_priv);
mutex_unlock(&lock);
return ret;
}
int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr)
{
struct rdma_id_private *id_priv;
int ret;
if (addr->sa_family != AF_INET)
return -EAFNOSUPPORT;
id_priv = container_of(id, struct rdma_id_private, id);
if (!cma_comp_exch(id_priv, CMA_IDLE, CMA_ADDR_BOUND))
return -EINVAL;
if (!cma_any_addr(addr)) {
ret = rdma_translate_ip(addr, &id->route.addr.dev_addr);
if (!ret)
ret = cma_acquire_dev(id_priv);
if (ret)
goto err;
}
memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr));
ret = cma_get_port(id_priv);
if (ret)
goto err;
return 0;
err:
cma_comp_exch(id_priv, CMA_ADDR_BOUND, CMA_IDLE);
return ret;
}
EXPORT_SYMBOL(rdma_bind_addr);
static int cma_format_hdr(void *hdr, enum rdma_port_space ps,
struct rdma_route *route)
{
struct sockaddr_in *src4, *dst4;
struct cma_hdr *cma_hdr;
struct sdp_hh *sdp_hdr;
src4 = (struct sockaddr_in *) &route->addr.src_addr;
dst4 = (struct sockaddr_in *) &route->addr.dst_addr;
switch (ps) {
case RDMA_PS_SDP:
sdp_hdr = hdr;
if (sdp_get_majv(sdp_hdr->sdp_version) != SDP_MAJ_VERSION)
return -EINVAL;
sdp_set_ip_ver(sdp_hdr, 4);
sdp_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
sdp_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
sdp_hdr->port = src4->sin_port;
break;
default:
cma_hdr = hdr;
cma_hdr->cma_version = CMA_VERSION;
cma_set_ip_ver(cma_hdr, 4);
cma_hdr->src_addr.ip4.addr = src4->sin_addr.s_addr;
cma_hdr->dst_addr.ip4.addr = dst4->sin_addr.s_addr;
cma_hdr->port = src4->sin_port;
break;
}
return 0;
}
static int cma_connect_ib(struct rdma_id_private *id_priv,
struct rdma_conn_param *conn_param)
{
struct ib_cm_req_param req;
struct rdma_route *route;
void *private_data;
int offset, ret;
memset(&req, 0, sizeof req);
offset = cma_user_data_offset(id_priv->id.ps);
req.private_data_len = offset + conn_param->private_data_len;
private_data = kzalloc(req.private_data_len, GFP_ATOMIC);
if (!private_data)
return -ENOMEM;
if (conn_param->private_data && conn_param->private_data_len)
memcpy(private_data + offset, conn_param->private_data,
conn_param->private_data_len);
id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, cma_ib_handler,
id_priv);
if (IS_ERR(id_priv->cm_id.ib)) {
ret = PTR_ERR(id_priv->cm_id.ib);
goto out;
}
route = &id_priv->id.route;
ret = cma_format_hdr(private_data, id_priv->id.ps, route);
if (ret)
goto out;
req.private_data = private_data;
req.primary_path = &route->path_rec[0];
if (route->num_paths == 2)
req.alternate_path = &route->path_rec[1];
req.service_id = cma_get_service_id(id_priv->id.ps,
&route->addr.dst_addr);
req.qp_num = id_priv->qp_num;
req.qp_type = id_priv->qp_type;
req.starting_psn = id_priv->seq_num;
req.responder_resources = conn_param->responder_resources;
req.initiator_depth = conn_param->initiator_depth;
req.flow_control = conn_param->flow_control;
req.retry_count = conn_param->retry_count;
req.rnr_retry_count = conn_param->rnr_retry_count;
req.remote_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
req.local_cm_response_timeout = CMA_CM_RESPONSE_TIMEOUT;
req.max_cm_retries = CMA_MAX_CM_RETRIES;
req.srq = id_priv->srq ? 1 : 0;
ret = ib_send_cm_req(id_priv->cm_id.ib, &req);
out:
kfree(private_data);
return ret;
}
int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
{
struct rdma_id_private *id_priv;
int ret;
id_priv = container_of(id, struct rdma_id_private, id);
if (!cma_comp_exch(id_priv, CMA_ROUTE_RESOLVED, CMA_CONNECT))
return -EINVAL;
if (!id->qp) {
id_priv->qp_num = conn_param->qp_num;
id_priv->qp_type = conn_param->qp_type;
id_priv->srq = conn_param->srq;
}
switch (id->device->node_type) {
case IB_NODE_CA:
ret = cma_connect_ib(id_priv, conn_param);
break;
default:
ret = -ENOSYS;
break;
}
if (ret)
goto err;
return 0;
err:
cma_comp_exch(id_priv, CMA_CONNECT, CMA_ROUTE_RESOLVED);
return ret;
}
EXPORT_SYMBOL(rdma_connect);
static int cma_accept_ib(struct rdma_id_private *id_priv,
struct rdma_conn_param *conn_param)
{
struct ib_cm_rep_param rep;
int ret;
ret = cma_modify_qp_rtr(&id_priv->id);
if (ret)
return ret;
memset(&rep, 0, sizeof rep);
rep.qp_num = id_priv->qp_num;
rep.starting_psn = id_priv->seq_num;
rep.private_data = conn_param->private_data;
rep.private_data_len = conn_param->private_data_len;
rep.responder_resources = conn_param->responder_resources;
rep.initiator_depth = conn_param->initiator_depth;
rep.target_ack_delay = CMA_CM_RESPONSE_TIMEOUT;
rep.failover_accepted = 0;
rep.flow_control = conn_param->flow_control;
rep.rnr_retry_count = conn_param->rnr_retry_count;
rep.srq = id_priv->srq ? 1 : 0;
return ib_send_cm_rep(id_priv->cm_id.ib, &rep);
}
int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param)
{
struct rdma_id_private *id_priv;
int ret;
id_priv = container_of(id, struct rdma_id_private, id);
if (!cma_comp(id_priv, CMA_CONNECT))
return -EINVAL;
if (!id->qp && conn_param) {
id_priv->qp_num = conn_param->qp_num;
id_priv->qp_type = conn_param->qp_type;
id_priv->srq = conn_param->srq;
}
switch (id->device->node_type) {
case IB_NODE_CA:
if (conn_param)
ret = cma_accept_ib(id_priv, conn_param);
else
ret = cma_rep_recv(id_priv);
break;
default:
ret = -ENOSYS;
break;
}
if (ret)
goto reject;
return 0;
reject:
cma_modify_qp_err(id);
rdma_reject(id, NULL, 0);
return ret;
}
EXPORT_SYMBOL(rdma_accept);
int rdma_reject(struct rdma_cm_id *id, const void *private_data,
u8 private_data_len)
{
struct rdma_id_private *id_priv;
int ret;
id_priv = container_of(id, struct rdma_id_private, id);
if (!cma_comp(id_priv, CMA_CONNECT))
return -EINVAL;
switch (id->device->node_type) {
case IB_NODE_CA:
ret = ib_send_cm_rej(id_priv->cm_id.ib,
IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
private_data, private_data_len);
break;
default:
ret = -ENOSYS;
break;
}
return ret;
}
EXPORT_SYMBOL(rdma_reject);
int rdma_disconnect(struct rdma_cm_id *id)
{
struct rdma_id_private *id_priv;
int ret;
id_priv = container_of(id, struct rdma_id_private, id);
if (!cma_comp(id_priv, CMA_CONNECT) &&
!cma_comp(id_priv, CMA_DISCONNECT))
return -EINVAL;
ret = cma_modify_qp_err(id);
if (ret)
goto out;
switch (id->device->node_type) {
case IB_NODE_CA:
/* Initiate or respond to a disconnect. */
if (ib_send_cm_dreq(id_priv->cm_id.ib, NULL, 0))
ib_send_cm_drep(id_priv->cm_id.ib, NULL, 0);
break;
default:
break;
}
out:
return ret;
}
EXPORT_SYMBOL(rdma_disconnect);
static void cma_add_one(struct ib_device *device)
{
struct cma_device *cma_dev;
struct rdma_id_private *id_priv;
cma_dev = kmalloc(sizeof *cma_dev, GFP_KERNEL);
if (!cma_dev)
return;
cma_dev->device = device;
cma_dev->node_guid = device->node_guid;
if (!cma_dev->node_guid)
goto err;
init_completion(&cma_dev->comp);
atomic_set(&cma_dev->refcount, 1);
INIT_LIST_HEAD(&cma_dev->id_list);
ib_set_client_data(device, &cma_client, cma_dev);
mutex_lock(&lock);
list_add_tail(&cma_dev->list, &dev_list);
list_for_each_entry(id_priv, &listen_any_list, list)
cma_listen_on_dev(id_priv, cma_dev);
mutex_unlock(&lock);
return;
err:
kfree(cma_dev);
}
static int cma_remove_id_dev(struct rdma_id_private *id_priv)
{
enum cma_state state;
/* Record that we want to remove the device */
state = cma_exch(id_priv, CMA_DEVICE_REMOVAL);
if (state == CMA_DESTROYING)
return 0;
cma_cancel_operation(id_priv, state);
wait_event(id_priv->wait_remove, !atomic_read(&id_priv->dev_remove));
/* Check for destruction from another callback. */
if (!cma_comp(id_priv, CMA_DEVICE_REMOVAL))
return 0;
return cma_notify_user(id_priv, RDMA_CM_EVENT_DEVICE_REMOVAL,
0, NULL, 0);
}
static void cma_process_remove(struct cma_device *cma_dev)
{
struct list_head remove_list;
struct rdma_id_private *id_priv;
int ret;
INIT_LIST_HEAD(&remove_list);
mutex_lock(&lock);
while (!list_empty(&cma_dev->id_list)) {
id_priv = list_entry(cma_dev->id_list.next,
struct rdma_id_private, list);
if (cma_internal_listen(id_priv)) {
cma_destroy_listen(id_priv);
continue;
}
list_del(&id_priv->list);
list_add_tail(&id_priv->list, &remove_list);
atomic_inc(&id_priv->refcount);
mutex_unlock(&lock);
ret = cma_remove_id_dev(id_priv);
cma_deref_id(id_priv);
if (ret)
rdma_destroy_id(&id_priv->id);
mutex_lock(&lock);
}
mutex_unlock(&lock);
cma_deref_dev(cma_dev);
wait_for_completion(&cma_dev->comp);
}
static void cma_remove_one(struct ib_device *device)
{
struct cma_device *cma_dev;
cma_dev = ib_get_client_data(device, &cma_client);
if (!cma_dev)
return;
mutex_lock(&lock);
list_del(&cma_dev->list);
mutex_unlock(&lock);
cma_process_remove(cma_dev);
kfree(cma_dev);
}
static int cma_init(void)
{
int ret;
cma_wq = create_singlethread_workqueue("rdma_cm_wq");
if (!cma_wq)
return -ENOMEM;
ret = ib_register_client(&cma_client);
if (ret)
goto err;
return 0;
err:
destroy_workqueue(cma_wq);
return ret;
}
static void cma_cleanup(void)
{
ib_unregister_client(&cma_client);
destroy_workqueue(cma_wq);
idr_destroy(&sdp_ps);
idr_destroy(&tcp_ps);
}
module_init(cma_init);
module_exit(cma_cleanup);