diff options
| -rw-r--r-- | drivers/infiniband/core/Makefile | 6 | ||||
| -rw-r--r-- | drivers/infiniband/core/cma.c | 1927 | ||||
| -rw-r--r-- | include/rdma/rdma_cm.h | 256 | ||||
| -rw-r--r-- | include/rdma/rdma_cm_ib.h | 47 |
4 files changed, 2234 insertions, 2 deletions
diff --git a/drivers/infiniband/core/Makefile b/drivers/infiniband/core/Makefile index 05095919d168..68e73ec2d1f8 100644 --- a/drivers/infiniband/core/Makefile +++ b/drivers/infiniband/core/Makefile @@ -1,7 +1,7 @@ -addr_trans-$(CONFIG_INFINIBAND_ADDR_TRANS) := ib_addr.o +infiniband-$(CONFIG_INFINIBAND_ADDR_TRANS) := ib_addr.o rdma_cm.o obj-$(CONFIG_INFINIBAND) += ib_core.o ib_mad.o ib_sa.o \ - ib_cm.o $(addr_trans-y) + ib_cm.o $(infiniband-y) obj-$(CONFIG_INFINIBAND_USER_MAD) += ib_umad.o obj-$(CONFIG_INFINIBAND_USER_ACCESS) += ib_uverbs.o ib_ucm.o @@ -14,6 +14,8 @@ ib_sa-y := sa_query.o ib_cm-y := cm.o +rdma_cm-y := cma.o + ib_addr-y := addr.o ib_umad-y := user_mad.o diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c new file mode 100644 index 000000000000..a76834edf608 --- /dev/null +++ b/drivers/infiniband/core/cma.c @@ -0,0 +1,1927 @@ +/* + * 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); diff --git a/include/rdma/rdma_cm.h b/include/rdma/rdma_cm.h new file mode 100644 index 000000000000..402c63d7226b --- /dev/null +++ b/include/rdma/rdma_cm.h @@ -0,0 +1,256 @@ +/* + * Copyright (c) 2005 Voltaire Inc. All rights reserved. + * Copyright (c) 2005 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. + * + */ + +#if !defined(RDMA_CM_H) +#define RDMA_CM_H + +#include <linux/socket.h> +#include <linux/in6.h> +#include <rdma/ib_addr.h> +#include <rdma/ib_sa.h> + +/* + * Upon receiving a device removal event, users must destroy the associated + * RDMA identifier and release all resources allocated with the device. + */ +enum rdma_cm_event_type { + RDMA_CM_EVENT_ADDR_RESOLVED, + RDMA_CM_EVENT_ADDR_ERROR, + RDMA_CM_EVENT_ROUTE_RESOLVED, + RDMA_CM_EVENT_ROUTE_ERROR, + RDMA_CM_EVENT_CONNECT_REQUEST, + RDMA_CM_EVENT_CONNECT_RESPONSE, + RDMA_CM_EVENT_CONNECT_ERROR, + RDMA_CM_EVENT_UNREACHABLE, + RDMA_CM_EVENT_REJECTED, + RDMA_CM_EVENT_ESTABLISHED, + RDMA_CM_EVENT_DISCONNECTED, + RDMA_CM_EVENT_DEVICE_REMOVAL, +}; + +enum rdma_port_space { + RDMA_PS_SDP = 0x0001, + RDMA_PS_TCP = 0x0106, + RDMA_PS_UDP = 0x0111, + RDMA_PS_SCTP = 0x0183 +}; + +struct rdma_addr { + struct sockaddr src_addr; + u8 src_pad[sizeof(struct sockaddr_in6) - + sizeof(struct sockaddr)]; + struct sockaddr dst_addr; + u8 dst_pad[sizeof(struct sockaddr_in6) - + sizeof(struct sockaddr)]; + struct rdma_dev_addr dev_addr; +}; + +struct rdma_route { + struct rdma_addr addr; + struct ib_sa_path_rec *path_rec; + int num_paths; +}; + +struct rdma_cm_event { + enum rdma_cm_event_type event; + int status; + void *private_data; + u8 private_data_len; +}; + +struct rdma_cm_id; + +/** + * rdma_cm_event_handler - Callback used to report user events. + * + * Notes: Users may not call rdma_destroy_id from this callback to destroy + * the passed in id, or a corresponding listen id. Returning a + * non-zero value from the callback will destroy the passed in id. + */ +typedef int (*rdma_cm_event_handler)(struct rdma_cm_id *id, + struct rdma_cm_event *event); + +struct rdma_cm_id { + struct ib_device *device; + void *context; + struct ib_qp *qp; + rdma_cm_event_handler event_handler; + struct rdma_route route; + enum rdma_port_space ps; + u8 port_num; +}; + +/** + * rdma_create_id - Create an RDMA identifier. + * + * @event_handler: User callback invoked to report events associated with the + * returned rdma_id. + * @context: User specified context associated with the id. + * @ps: RDMA port space. + */ +struct rdma_cm_id *rdma_create_id(rdma_cm_event_handler event_handler, + void *context, enum rdma_port_space ps); + +void rdma_destroy_id(struct rdma_cm_id *id); + +/** + * rdma_bind_addr - Bind an RDMA identifier to a source address and + * associated RDMA device, if needed. + * + * @id: RDMA identifier. + * @addr: Local address information. Wildcard values are permitted. + * + * This associates a source address with the RDMA identifier before calling + * rdma_listen. If a specific local address is given, the RDMA identifier will + * be bound to a local RDMA device. + */ +int rdma_bind_addr(struct rdma_cm_id *id, struct sockaddr *addr); + +/** + * rdma_resolve_addr - Resolve destination and optional source addresses + * from IP addresses to an RDMA address. If successful, the specified + * rdma_cm_id will be bound to a local device. + * + * @id: RDMA identifier. + * @src_addr: Source address information. This parameter may be NULL. + * @dst_addr: Destination address information. + * @timeout_ms: Time to wait for resolution to complete. + */ +int rdma_resolve_addr(struct rdma_cm_id *id, struct sockaddr *src_addr, + struct sockaddr *dst_addr, int timeout_ms); + +/** + * rdma_resolve_route - Resolve the RDMA address bound to the RDMA identifier + * into route information needed to establish a connection. + * + * This is called on the client side of a connection. + * Users must have first called rdma_resolve_addr to resolve a dst_addr + * into an RDMA address before calling this routine. + */ +int rdma_resolve_route(struct rdma_cm_id *id, int timeout_ms); + +/** + * rdma_create_qp - Allocate a QP and associate it with the specified RDMA + * identifier. + * + * QPs allocated to an rdma_cm_id will automatically be transitioned by the CMA + * through their states. + */ +int rdma_create_qp(struct rdma_cm_id *id, struct ib_pd *pd, + struct ib_qp_init_attr *qp_init_attr); + +/** + * rdma_destroy_qp - Deallocate the QP associated with the specified RDMA + * identifier. + * + * Users must destroy any QP associated with an RDMA identifier before + * destroying the RDMA ID. + */ +void rdma_destroy_qp(struct rdma_cm_id *id); + +/** + * rdma_init_qp_attr - Initializes the QP attributes for use in transitioning + * to a specified QP state. + * @id: Communication identifier associated with the QP attributes to + * initialize. + * @qp_attr: On input, specifies the desired QP state. On output, the + * mandatory and desired optional attributes will be set in order to + * modify the QP to the specified state. + * @qp_attr_mask: The QP attribute mask that may be used to transition the + * QP to the specified state. + * + * Users must set the @qp_attr->qp_state to the desired QP state. This call + * will set all required attributes for the given transition, along with + * known optional attributes. Users may override the attributes returned from + * this call before calling ib_modify_qp. + * + * Users that wish to have their QP automatically transitioned through its + * states can associate a QP with the rdma_cm_id by calling rdma_create_qp(). + */ +int rdma_init_qp_attr(struct rdma_cm_id *id, struct ib_qp_attr *qp_attr, + int *qp_attr_mask); + +struct rdma_conn_param { + const void *private_data; + u8 private_data_len; + u8 responder_resources; + u8 initiator_depth; + u8 flow_control; + u8 retry_count; /* ignored when accepting */ + u8 rnr_retry_count; + /* Fields below ignored if a QP is created on the rdma_cm_id. */ + u8 srq; + u32 qp_num; + enum ib_qp_type qp_type; +}; + +/** + * rdma_connect - Initiate an active connection request. + * + * Users must have resolved a route for the rdma_cm_id to connect with + * by having called rdma_resolve_route before calling this routine. + */ +int rdma_connect(struct rdma_cm_id *id, struct rdma_conn_param *conn_param); + +/** + * rdma_listen - This function is called by the passive side to + * listen for incoming connection requests. + * + * Users must have bound the rdma_cm_id to a local address by calling + * rdma_bind_addr before calling this routine. + */ +int rdma_listen(struct rdma_cm_id *id, int backlog); + +/** + * rdma_accept - Called to accept a connection request or response. + * @id: Connection identifier associated with the request. + * @conn_param: Information needed to establish the connection. This must be + * provided if accepting a connection request. If accepting a connection + * response, this parameter must be NULL. + * + * Typically, this routine is only called by the listener to accept a connection + * request. It must also be called on the active side of a connection if the + * user is performing their own QP transitions. + */ +int rdma_accept(struct rdma_cm_id *id, struct rdma_conn_param *conn_param); + +/** + * rdma_reject - Called to reject a connection request or response. + */ +int rdma_reject(struct rdma_cm_id *id, const void *private_data, + u8 private_data_len); + +/** + * rdma_disconnect - This function disconnects the associated QP and + * transitions it into the error state. + */ +int rdma_disconnect(struct rdma_cm_id *id); + +#endif /* RDMA_CM_H */ + diff --git a/include/rdma/rdma_cm_ib.h b/include/rdma/rdma_cm_ib.h new file mode 100644 index 000000000000..e8c3af1804d4 --- /dev/null +++ b/include/rdma/rdma_cm_ib.h @@ -0,0 +1,47 @@ +/* + * Copyright (c) 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. + * + */ + +#if !defined(RDMA_CM_IB_H) +#define RDMA_CM_IB_H + +#include <rdma/rdma_cm.h> + +/** + * rdma_set_ib_paths - Manually sets the path records used to establish a + * connection. + * @id: Connection identifier associated with the request. + * @path_rec: Reference to the path record + * + * This call permits a user to specify routing information for rdma_cm_id's + * bound to Infiniband devices. It is called on the client side of a + * connection and replaces the call to rdma_resolve_route. + */ +int rdma_set_ib_paths(struct rdma_cm_id *id, + struct ib_sa_path_rec *path_rec, int num_paths); + +#endif /* RDMA_CM_IB_H */ |