diff options
Diffstat (limited to 'drivers/infiniband/core/cma.c')
| -rw-r--r-- | drivers/infiniband/core/cma.c | 2956 |
1 files changed, 2956 insertions, 0 deletions
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c new file mode 100644 index 0000000..d951896 --- /dev/null +++ b/drivers/infiniband/core/cma.c @@ -0,0 +1,2956 @@ +/* + * 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 available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the + * OpenIB.org BSD license below: + * + * Redistribution and use in source and binary forms, with or + * without modification, are permitted provided that the following + * conditions are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the following + * disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials + * provided with the distribution. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + */ + +#include <linux/completion.h> +#include <linux/in.h> +#include <linux/in6.h> +#include <linux/mutex.h> +#include <linux/random.h> +#include <linux/idr.h> +#include <linux/inetdevice.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> +#include <rdma/iw_cm.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 15 +#define CMA_CM_MRA_SETTING (IB_CM_MRA_FLAG_DELAY | 24) + +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 struct ib_sa_client sa_client; +static struct rdma_addr_client addr_client; +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); +static DEFINE_IDR(udp_ps); +static DEFINE_IDR(ipoib_ps); +static int next_port; + +struct cma_device { + struct list_head list; + struct ib_device *device; + 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; /* listen_any_list or cma_device.list */ + struct list_head listen_list; /* per device listens */ + struct cma_device *cma_dev; + struct list_head mc_list; + + int internal_id; + enum cma_state state; + spinlock_t lock; + struct mutex qp_mutex; + + struct completion comp; + atomic_t refcount; + struct mutex handler_mutex; + + int backlog; + int timeout_ms; + struct ib_sa_query *query; + int query_id; + union { + struct ib_cm_id *ib; + struct iw_cm_id *iw; + } cm_id; + + u32 seq_num; + u32 qkey; + u32 qp_num; + u8 srq; + u8 tos; +}; + +struct cma_multicast { + struct rdma_id_private *id_priv; + union { + struct ib_sa_multicast *ib; + } multicast; + struct list_head list; + void *context; + struct sockaddr_storage addr; +}; + +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; +}; + +struct cma_ndev_work { + struct work_struct work; + struct rdma_id_private *id; + struct rdma_cm_event event; +}; + +union cma_ip_addr { + struct in6_addr ip6; + struct { + __be32 pad[3]; + __be32 addr; + } ip4; +}; + +struct cma_hdr { + u8 cma_version; + u8 ip_version; /* IP version: 7:4 */ + __be16 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]; + __be16 port; + __be16 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 inline int cma_is_ud_ps(enum rdma_port_space ps) +{ + return (ps == RDMA_PS_UDP || ps == RDMA_PS_IPOIB); +} + +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_set_qkey(struct ib_device *device, u8 port_num, + enum rdma_port_space ps, + struct rdma_dev_addr *dev_addr, u32 *qkey) +{ + struct ib_sa_mcmember_rec rec; + int ret = 0; + + switch (ps) { + case RDMA_PS_UDP: + *qkey = RDMA_UDP_QKEY; + break; + case RDMA_PS_IPOIB: + ib_addr_get_mgid(dev_addr, &rec.mgid); + ret = ib_sa_get_mcmember_rec(device, port_num, &rec.mgid, &rec); + *qkey = be32_to_cpu(rec.qkey); + break; + default: + break; + } + return ret; +} + +static int cma_acquire_dev(struct rdma_id_private *id_priv) +{ + struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; + struct cma_device *cma_dev; + union ib_gid gid; + int ret = -ENODEV; + + switch (rdma_node_get_transport(dev_addr->dev_type)) { + case RDMA_TRANSPORT_IB: + ib_addr_get_sgid(dev_addr, &gid); + break; + case RDMA_TRANSPORT_IWARP: + iw_addr_get_sgid(dev_addr, &gid); + break; + default: + return -ENODEV; + } + + 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) { + ret = cma_set_qkey(cma_dev->device, + id_priv->id.port_num, + id_priv->id.ps, dev_addr, + &id_priv->qkey); + if (!ret) + cma_attach_to_dev(id_priv, cma_dev); + break; + } + } + return ret; +} + +static void cma_deref_id(struct rdma_id_private *id_priv) +{ + if (atomic_dec_and_test(&id_priv->refcount)) + complete(&id_priv->comp); +} + +static int cma_disable_callback(struct rdma_id_private *id_priv, + enum cma_state state) +{ + mutex_lock(&id_priv->handler_mutex); + if (id_priv->state != state) { + mutex_unlock(&id_priv->handler_mutex); + return -EINVAL; + } + return 0; +} + +static int cma_has_cm_dev(struct rdma_id_private *id_priv) +{ + return (id_priv->id.device && id_priv->cm_id.ib); +} + +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); + mutex_init(&id_priv->qp_mutex); + init_completion(&id_priv->comp); + atomic_set(&id_priv->refcount, 1); + mutex_init(&id_priv->handler_mutex); + INIT_LIST_HEAD(&id_priv->listen_list); + INIT_LIST_HEAD(&id_priv->mc_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_ud_qp(struct rdma_id_private *id_priv, struct ib_qp *qp) +{ + struct ib_qp_attr qp_attr; + int qp_attr_mask, ret; + + qp_attr.qp_state = IB_QPS_INIT; + ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); + if (ret) + return ret; + + ret = ib_modify_qp(qp, &qp_attr, qp_attr_mask); + if (ret) + return ret; + + qp_attr.qp_state = IB_QPS_RTR; + ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE); + if (ret) + return ret; + + qp_attr.qp_state = IB_QPS_RTS; + qp_attr.sq_psn = 0; + ret = ib_modify_qp(qp, &qp_attr, IB_QP_STATE | IB_QP_SQ_PSN); + + return ret; +} + +static int cma_init_conn_qp(struct rdma_id_private *id_priv, struct ib_qp *qp) +{ + struct ib_qp_attr qp_attr; + int qp_attr_mask, ret; + + qp_attr.qp_state = IB_QPS_INIT; + ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); + if (ret) + return ret; + + return ib_modify_qp(qp, &qp_attr, qp_attr_mask); +} + +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); + + if (cma_is_ud_ps(id_priv->id.ps)) + ret = cma_init_ud_qp(id_priv, qp); + else + ret = cma_init_conn_qp(id_priv, qp); + if (ret) + goto err; + + id->qp = qp; + id_priv->qp_num = qp->qp_num; + 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) +{ + struct rdma_id_private *id_priv; + + id_priv = container_of(id, struct rdma_id_private, id); + mutex_lock(&id_priv->qp_mutex); + ib_destroy_qp(id_priv->id.qp); + id_priv->id.qp = NULL; + mutex_unlock(&id_priv->qp_mutex); +} +EXPORT_SYMBOL(rdma_destroy_qp); + +static int cma_modify_qp_rtr(struct rdma_id_private *id_priv, + struct rdma_conn_param *conn_param) +{ + struct ib_qp_attr qp_attr; + int qp_attr_mask, ret; + + mutex_lock(&id_priv->qp_mutex); + if (!id_priv->id.qp) { + ret = 0; + goto out; + } + + /* Need to update QP attributes from default values. */ + qp_attr.qp_state = IB_QPS_INIT; + ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); + if (ret) + goto out; + + ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask); + if (ret) + goto out; + + qp_attr.qp_state = IB_QPS_RTR; + ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); + if (ret) + goto out; + + if (conn_param) + qp_attr.max_dest_rd_atomic = conn_param->responder_resources; + ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask); +out: + mutex_unlock(&id_priv->qp_mutex); + return ret; +} + +static int cma_modify_qp_rts(struct rdma_id_private *id_priv, + struct rdma_conn_param *conn_param) +{ + struct ib_qp_attr qp_attr; + int qp_attr_mask, ret; + + mutex_lock(&id_priv->qp_mutex); + if (!id_priv->id.qp) { + ret = 0; + goto out; + } + + qp_attr.qp_state = IB_QPS_RTS; + ret = rdma_init_qp_attr(&id_priv->id, &qp_attr, &qp_attr_mask); + if (ret) + goto out; + + if (conn_param) + qp_attr.max_rd_atomic = conn_param->initiator_depth; + ret = ib_modify_qp(id_priv->id.qp, &qp_attr, qp_attr_mask); +out: + mutex_unlock(&id_priv->qp_mutex); + return ret; +} + +static int cma_modify_qp_err(struct rdma_id_private *id_priv) +{ + struct ib_qp_attr qp_attr; + int ret; + + mutex_lock(&id_priv->qp_mutex); + if (!id_priv->id.qp) { + ret = 0; + goto out; + } + + qp_attr.qp_state = IB_QPS_ERR; + ret = ib_modify_qp(id_priv->id.qp, &qp_attr, IB_QP_STATE); +out: + mutex_unlock(&id_priv->qp_mutex); + return ret; +} + +static int cma_ib_init_qp_attr(struct rdma_id_private *id_priv, + struct ib_qp_attr *qp_attr, int *qp_attr_mask) +{ + struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; + int ret; + + 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->port_num = id_priv->id.port_num; + *qp_attr_mask = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_PORT; + + if (cma_is_ud_ps(id_priv->id.ps)) { + qp_attr->qkey = id_priv->qkey; + *qp_attr_mask |= IB_QP_QKEY; + } else { + qp_attr->qp_access_flags = 0; + *qp_attr_mask |= IB_QP_ACCESS_FLAGS; + } + return 0; +} + +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 = 0; + + id_priv = container_of(id, struct rdma_id_private, id); + switch (rdma_node_get_transport(id_priv->id.device->node_type)) { + case RDMA_TRANSPORT_IB: + if (!id_priv->cm_id.ib || cma_is_ud_ps(id_priv->id.ps)) + ret = cma_ib_init_qp_attr(id_priv, qp_attr, qp_attr_mask); + else + 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; + case RDMA_TRANSPORT_IWARP: + if (!id_priv->cm_id.iw) { + qp_attr->qp_access_flags = 0; + *qp_attr_mask = IB_QP_STATE | IB_QP_ACCESS_FLAGS; + } else + ret = iw_cm_init_qp_attr(id_priv->cm_id.iw, qp_attr, + qp_attr_mask); + 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 ipv4_is_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[2] | ip6->s6_addr32[3]) == 0; + } +} + +static inline int cma_loopback_addr(struct sockaddr *addr) +{ + return ipv4_is_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 __be16 cma_port(struct sockaddr *addr) +{ + if (addr->sa_family == AF_INET) + return ((struct sockaddr_in *) addr)->sin_port; + else + return ((struct sockaddr_in6 *) addr)->sin6_port; +} + +static inline int cma_any_port(struct sockaddr *addr) +{ + return !cma_port(addr); +} + +static int cma_get_net_info(void *hdr, enum rdma_port_space ps, + u8 *ip_ver, __be16 *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, __be16 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 void cma_cancel_route(struct rdma_id_private *id_priv) +{ + switch (rdma_node_get_transport(id_priv->id.device->node_type)) { + case RDMA_TRANSPORT_IB: + if (id_priv->query) + ib_sa_cancel_query(id_priv->query_id, id_priv->query); + break; + default: + break; + } +} + +static void cma_cancel_listens(struct rdma_id_private *id_priv) +{ + struct rdma_id_private *dev_id_priv; + + /* + * Remove from listen_any_list to prevent added devices from spawning + * additional listen requests. + */ + 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); + /* sync with device removal to avoid duplicate destruction */ + list_del_init(&dev_id_priv->list); + list_del(&dev_id_priv->listen_list); + mutex_unlock(&lock); + + rdma_destroy_id(&dev_id_priv->id); + mutex_lock(&lock); + } + 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((struct sockaddr *) &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); +} + +static void cma_leave_mc_groups(struct rdma_id_private *id_priv) +{ + struct cma_multicast *mc; + + while (!list_empty(&id_priv->mc_list)) { + mc = container_of(id_priv->mc_list.next, + struct cma_multicast, list); + list_del(&mc->list); + ib_sa_free_multicast(mc->multicast.ib); + kfree(mc); + } +} + +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); + + mutex_lock(&lock); + if (id_priv->cma_dev) { + mutex_unlock(&lock); + switch (rdma_node_get_transport(id->device->node_type)) { + case RDMA_TRANSPORT_IB: + if (id_priv->cm_id.ib && !IS_ERR(id_priv->cm_id.ib)) + ib_destroy_cm_id(id_priv->cm_id.ib); + break; + case RDMA_TRANSPORT_IWARP: + if (id_priv->cm_id.iw && !IS_ERR(id_priv->cm_id.iw)) + iw_destroy_cm_id(id_priv->cm_id.iw); + break; + default: + break; + } + cma_leave_mc_groups(id_priv); + 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); + + if (id_priv->internal_id) + cma_deref_id(id_priv->id.context); + + 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, NULL); + if (ret) + goto reject; + + ret = cma_modify_qp_rts(id_priv, NULL); + 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); + 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 void cma_set_rep_event_data(struct rdma_cm_event *event, + struct ib_cm_rep_event_param *rep_data, + void *private_data) +{ + event->param.conn.private_data = private_data; + event->param.conn.private_data_len = IB_CM_REP_PRIVATE_DATA_SIZE; + event->param.conn.responder_resources = rep_data->responder_resources; + event->param.conn.initiator_depth = rep_data->initiator_depth; + event->param.conn.flow_control = rep_data->flow_control; + event->param.conn.rnr_retry_count = rep_data->rnr_retry_count; + event->param.conn.srq = rep_data->srq; + event->param.conn.qp_num = rep_data->remote_qpn; +} + +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; + struct rdma_cm_event event; + int ret = 0; + + if ((ib_event->event != IB_CM_TIMEWAIT_EXIT && + cma_disable_callback(id_priv, CMA_CONNECT)) || + (ib_event->event == IB_CM_TIMEWAIT_EXIT && + cma_disable_callback(id_priv, CMA_DISCONNECT))) + return 0; + + memset(&event, 0, sizeof event); + switch (ib_event->event) { + case IB_CM_REQ_ERROR: + case IB_CM_REP_ERROR: + event.event = RDMA_CM_EVENT_UNREACHABLE; + event.status = -ETIMEDOUT; + break; + case IB_CM_REP_RECEIVED: + event.status = cma_verify_rep(id_priv, ib_event->private_data); + if (event.status) + event.event = RDMA_CM_EVENT_CONNECT_ERROR; + else if (id_priv->id.qp && id_priv->id.ps != RDMA_PS_SDP) { + event.status = cma_rep_recv(id_priv); + event.event = event.status ? RDMA_CM_EVENT_CONNECT_ERROR : + RDMA_CM_EVENT_ESTABLISHED; + } else + event.event = RDMA_CM_EVENT_CONNECT_RESPONSE; + cma_set_rep_event_data(&event, &ib_event->param.rep_rcvd, + ib_event->private_data); + break; + case IB_CM_RTU_RECEIVED: + case IB_CM_USER_ESTABLISHED: + event.event = RDMA_CM_EVENT_ESTABLISHED; + break; + case IB_CM_DREQ_ERROR: + event.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.event = RDMA_CM_EVENT_DISCONNECTED; + break; + case IB_CM_TIMEWAIT_EXIT: + event.event = RDMA_CM_EVENT_TIMEWAIT_EXIT; + break; + case IB_CM_MRA_RECEIVED: + /* ignore event */ + goto out; + case IB_CM_REJ_RECEIVED: + cma_modify_qp_err(id_priv); + event.status = ib_event->param.rej_rcvd.reason; + event.event = RDMA_CM_EVENT_REJECTED; + event.param.conn.private_data = ib_event->private_data; + event.param.conn.private_data_len = IB_CM_REJ_PRIVATE_DATA_SIZE; + break; + default: + printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n", + ib_event->event); + goto out; + } + + ret = id_priv->id.event_handler(&id_priv->id, &event); + if (ret) { + /* Destroy the CM ID by returning a non-zero value. */ + id_priv->cm_id.ib = NULL; + cma_exch(id_priv, CMA_DESTROYING); + mutex_unlock(&id_priv->handler_mutex); + rdma_destroy_id(&id_priv->id); + return ret; + } +out: + mutex_unlock(&id_priv->handler_mutex); + return ret; +} + +static struct rdma_id_private *cma_new_conn_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; + __be16 port; + u8 ip_ver; + int ret; + + if (cma_get_net_info(ib_event->private_data, listen_id->ps, + &ip_ver, &port, &src, &dst)) + goto err; + + id = rdma_create_id(listen_id->event_handler, listen_id->context, + listen_id->ps); + if (IS_ERR(id)) + goto err; + + cma_save_net_info(&id->route.addr, &listen_id->route.addr, + ip_ver, port, src, dst); + + 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 destroy_id; + + 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_dgid(&rt->addr.dev_addr, &rt->path_rec[0].dgid); + ret = rdma_translate_ip((struct sockaddr *) &id->route.addr.src_addr, + &id->route.addr.dev_addr); + if (ret) + goto destroy_id; + + id_priv = container_of(id, struct rdma_id_private, id); + id_priv->state = CMA_CONNECT; + return id_priv; + +destroy_id: + rdma_destroy_id(id); +err: + return NULL; +} + +static struct rdma_id_private *cma_new_udp_id(struct rdma_cm_id *listen_id, + struct ib_cm_event *ib_event) +{ + struct rdma_id_private *id_priv; + struct rdma_cm_id *id; + union cma_ip_addr *src, *dst; + __be16 port; + u8 ip_ver; + int ret; + + id = rdma_create_id(listen_id->event_handler, listen_id->context, + listen_id->ps); + if (IS_ERR(id)) + return NULL; + + + 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); + + ret = rdma_translate_ip((struct sockaddr *) &id->route.addr.src_addr, + &id->route.addr.dev_addr); + if (ret) + goto err; + + 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 void cma_set_req_event_data(struct rdma_cm_event *event, + struct ib_cm_req_event_param *req_data, + void *private_data, int offset) +{ + event->param.conn.private_data = private_data + offset; + event->param.conn.private_data_len = IB_CM_REQ_PRIVATE_DATA_SIZE - offset; + event->param.conn.responder_resources = req_data->responder_resources; + event->param.conn.initiator_depth = req_data->initiator_depth; + event->param.conn.flow_control = req_data->flow_control; + event->param.conn.retry_count = req_data->retry_count; + event->param.conn.rnr_retry_count = req_data->rnr_retry_count; + event->param.conn.srq = req_data->srq; + event->param.conn.qp_num = req_data->remote_qpn; +} + +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; + struct rdma_cm_event event; + int offset, ret; + + listen_id = cm_id->context; + if (cma_disable_callback(listen_id, CMA_LISTEN)) + return -ECONNABORTED; + + memset(&event, 0, sizeof event); + offset = cma_user_data_offset(listen_id->id.ps); + event.event = RDMA_CM_EVENT_CONNECT_REQUEST; + if (cma_is_ud_ps(listen_id->id.ps)) { + conn_id = cma_new_udp_id(&listen_id->id, ib_event); + event.param.ud.private_data = ib_event->private_data + offset; + event.param.ud.private_data_len = + IB_CM_SIDR_REQ_PRIVATE_DATA_SIZE - offset; + } else { + conn_id = cma_new_conn_id(&listen_id->id, ib_event); + cma_set_req_event_data(&event, &ib_event->param.req_rcvd, + ib_event->private_data, offset); + } + if (!conn_id) { + ret = -ENOMEM; + goto out; + } + + mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING); + mutex_lock(&lock); + ret = cma_acquire_dev(conn_id); + mutex_unlock(&lock); + if (ret) + goto release_conn_id; + + conn_id->cm_id.ib = cm_id; + cm_id->context = conn_id; + cm_id->cm_handler = cma_ib_handler; + + ret = conn_id->id.event_handler(&conn_id->id, &event); + if (!ret) { + /* + * Acquire mutex to prevent user executing rdma_destroy_id() + * while we're accessing the cm_id. + */ + mutex_lock(&lock); + if (cma_comp(conn_id, CMA_CONNECT) && + !cma_is_ud_ps(conn_id->id.ps)) + ib_send_cm_mra(cm_id, CMA_CM_MRA_SETTING, NULL, 0); + mutex_unlock(&lock); + mutex_unlock(&conn_id->handler_mutex); + goto out; + } + + /* Destroy the CM ID by returning a non-zero value. */ + conn_id->cm_id.ib = NULL; + +release_conn_id: + cma_exch(conn_id, CMA_DESTROYING); + mutex_unlock(&conn_id->handler_mutex); + rdma_destroy_id(&conn_id->id); + +out: + mutex_unlock(&listen_id->handler_mutex); + 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(cma_port(addr))); +} + +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; + __be32 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 = htonl(~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 = htonl(~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_iw_handler(struct iw_cm_id *iw_id, struct iw_cm_event *iw_event) +{ + struct rdma_id_private *id_priv = iw_id->context; + struct rdma_cm_event event; + struct sockaddr_in *sin; + int ret = 0; + + if (cma_disable_callback(id_priv, CMA_CONNECT)) + return 0; + + memset(&event, 0, sizeof event); + switch (iw_event->event) { + case IW_CM_EVENT_CLOSE: + event.event = RDMA_CM_EVENT_DISCONNECTED; + break; + case IW_CM_EVENT_CONNECT_REPLY: + sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr; + *sin = iw_event->local_addr; + sin = (struct sockaddr_in *) &id_priv->id.route.addr.dst_addr; + *sin = iw_event->remote_addr; + switch (iw_event->status) { + case 0: + event.event = RDMA_CM_EVENT_ESTABLISHED; + break; + case -ECONNRESET: + case -ECONNREFUSED: + event.event = RDMA_CM_EVENT_REJECTED; + break; + case -ETIMEDOUT: + event.event = RDMA_CM_EVENT_UNREACHABLE; + break; + default: + event.event = RDMA_CM_EVENT_CONNECT_ERROR; + break; + } + break; + case IW_CM_EVENT_ESTABLISHED: + event.event = RDMA_CM_EVENT_ESTABLISHED; + break; + default: + BUG_ON(1); + } + + event.status = iw_event->status; + event.param.conn.private_data = iw_event->private_data; + event.param.conn.private_data_len = iw_event->private_data_len; + ret = id_priv->id.event_handler(&id_priv->id, &event); + if (ret) { + /* Destroy the CM ID by returning a non-zero value. */ + id_priv->cm_id.iw = NULL; + cma_exch(id_priv, CMA_DESTROYING); + mutex_unlock(&id_priv->handler_mutex); + rdma_destroy_id(&id_priv->id); + return ret; + } + + mutex_unlock(&id_priv->handler_mutex); + return ret; +} + +static int iw_conn_req_handler(struct iw_cm_id *cm_id, + struct iw_cm_event *iw_event) +{ + struct rdma_cm_id *new_cm_id; + struct rdma_id_private *listen_id, *conn_id; + struct sockaddr_in *sin; + struct net_device *dev = NULL; + struct rdma_cm_event event; + int ret; + struct ib_device_attr attr; + + listen_id = cm_id->context; + if (cma_disable_callback(listen_id, CMA_LISTEN)) + return -ECONNABORTED; + + /* Create a new RDMA id for the new IW CM ID */ + new_cm_id = rdma_create_id(listen_id->id.event_handler, + listen_id->id.context, + RDMA_PS_TCP); + if (IS_ERR(new_cm_id)) { + ret = -ENOMEM; + goto out; + } + conn_id = container_of(new_cm_id, struct rdma_id_private, id); + mutex_lock_nested(&conn_id->handler_mutex, SINGLE_DEPTH_NESTING); + conn_id->state = CMA_CONNECT; + + dev = ip_dev_find(&init_net, iw_event->local_addr.sin_addr.s_addr); + if (!dev) { + ret = -EADDRNOTAVAIL; + mutex_unlock(&conn_id->handler_mutex); + rdma_destroy_id(new_cm_id); + goto out; + } + ret = rdma_copy_addr(&conn_id->id.route.addr.dev_addr, dev, NULL); + if (ret) { + mutex_unlock(&conn_id->handler_mutex); + rdma_destroy_id(new_cm_id); + goto out; + } + + mutex_lock(&lock); + ret = cma_acquire_dev(conn_id); + mutex_unlock(&lock); + if (ret) { + mutex_unlock(&conn_id->handler_mutex); + rdma_destroy_id(new_cm_id); + goto out; + } + + conn_id->cm_id.iw = cm_id; + cm_id->context = conn_id; + cm_id->cm_handler = cma_iw_handler; + + sin = (struct sockaddr_in *) &new_cm_id->route.addr.src_addr; + *sin = iw_event->local_addr; + sin = (struct sockaddr_in *) &new_cm_id->route.addr.dst_addr; + *sin = iw_event->remote_addr; + + ret = ib_query_device(conn_id->id.device, &attr); + if (ret) { + mutex_unlock(&conn_id->handler_mutex); + rdma_destroy_id(new_cm_id); + goto out; + } + + memset(&event, 0, sizeof event); + event.event = RDMA_CM_EVENT_CONNECT_REQUEST; + event.param.conn.private_data = iw_event->private_data; + event.param.conn.private_data_len = iw_event->private_data_len; + event.param.conn.initiator_depth = attr.max_qp_init_rd_atom; + event.param.conn.responder_resources = attr.max_qp_rd_atom; + ret = conn_id->id.event_handler(&conn_id->id, &event); + if (ret) { + /* User wants to destroy the CM ID */ + conn_id->cm_id.iw = NULL; + cma_exch(conn_id, CMA_DESTROYING); + mutex_unlock(&conn_id->handler_mutex); + rdma_destroy_id(&conn_id->id); + goto out; + } + + mutex_unlock(&conn_id->handler_mutex); + +out: + if (dev) + dev_put(dev); + mutex_unlock(&listen_id->handler_mutex); + return ret; +} + +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 = (struct sockaddr *) &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_iw_listen(struct rdma_id_private *id_priv, int backlog) +{ + int ret; + struct sockaddr_in *sin; + + id_priv->cm_id.iw = iw_create_cm_id(id_priv->id.device, + iw_conn_req_handler, + id_priv); + if (IS_ERR(id_priv->cm_id.iw)) + return PTR_ERR(id_priv->cm_id.iw); + + sin = (struct sockaddr_in *) &id_priv->id.route.addr.src_addr; + id_priv->cm_id.iw->local_addr = *sin; + + ret = iw_cm_listen(id_priv->cm_id.iw, backlog); + + if (ret) { + iw_destroy_cm_id(id_priv->cm_id.iw); + id_priv->cm_id.iw = 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((struct sockaddr *) &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); + atomic_inc(&id_priv->refcount); + dev_id_priv->internal_id = 1; + + ret = rdma_listen(id, id_priv->backlog); + if (ret) + printk(KERN_WARNING "RDMA CMA: cma_listen_on_dev, error %d, " + "listening on device %s\n", ret, cma_dev->device->name); +} + +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 (rdma_node_get_transport(id->device->node_type)) { + case RDMA_TRANSPORT_IB: + ret = cma_ib_listen(id_priv); + if (ret) + goto err; + break; + case RDMA_TRANSPORT_IWARP: + ret = cma_iw_listen(id_priv, backlog); + 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); + +void rdma_set_service_type(struct rdma_cm_id *id, int tos) +{ + struct rdma_id_private *id_priv; + + id_priv = container_of(id, struct rdma_id_private, id); + id_priv->tos = (u8) tos; +} +EXPORT_SYMBOL(rdma_set_service_type); + +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; + work->event.status = status; + } + + 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_addr *addr = &id_priv->id.route.addr; + struct ib_sa_path_rec path_rec; + ib_sa_comp_mask comp_mask; + struct sockaddr_in6 *sin6; + + memset(&path_rec, 0, sizeof path_rec); + ib_addr_get_sgid(&addr->dev_addr, &path_rec.sgid); + ib_addr_get_dgid(&addr->dev_addr, &path_rec.dgid); + path_rec.pkey = cpu_to_be16(ib_addr_get_pkey(&addr->dev_addr)); + path_rec.numb_path = 1; + path_rec.reversible = 1; + path_rec.service_id = cma_get_service_id(id_priv->id.ps, + (struct sockaddr *) &addr->dst_addr); + + comp_mask = IB_SA_PATH_REC_DGID | IB_SA_PATH_REC_SGID | + IB_SA_PATH_REC_PKEY | IB_SA_PATH_REC_NUMB_PATH | + IB_SA_PATH_REC_REVERSIBLE | IB_SA_PATH_REC_SERVICE_ID; + + if (addr->src_addr.ss_family == AF_INET) { + path_rec.qos_class = cpu_to_be16((u16) id_priv->tos); + comp_mask |= IB_SA_PATH_REC_QOS_CLASS; + } else { + sin6 = (struct sockaddr_in6 *) &addr->src_addr; + path_rec.traffic_class = (u8) (be32_to_cpu(sin6->sin6_flowinfo) >> 20); + comp_mask |= IB_SA_PATH_REC_TRAFFIC_CLASS; + } + + id_priv->query_id = ib_sa_path_rec_get(&sa_client, id_priv->id.device, + id_priv->id.port_num, &path_rec, + comp_mask, 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(struct work_struct *_work) +{ + struct cma_work *work = container_of(_work, struct cma_work, work); + struct rdma_id_private *id_priv = work->id; + int destroy = 0; + + mutex_lock(&id_priv->handler_mutex); + 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: + mutex_unlock(&id_priv->handler_mutex); + cma_deref_id(id_priv); + if (destroy) + rdma_destroy_id(&id_priv->id); + kfree(work); +} + +static void cma_ndev_work_handler(struct work_struct *_work) +{ + struct cma_ndev_work *work = container_of(_work, struct cma_ndev_work, work); + struct rdma_id_private *id_priv = work->id; + int destroy = 0; + + mutex_lock(&id_priv->handler_mutex); + if (id_priv->state == CMA_DESTROYING || + id_priv->state == CMA_DEVICE_REMOVAL) + goto out; + + if (id_priv->id.event_handler(&id_priv->id, &work->event)) { + cma_exch(id_priv, CMA_DESTROYING); + destroy = 1; + } + +out: + mutex_unlock(&id_priv->handler_mutex); + 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->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); + +static int cma_resolve_iw_route(struct rdma_id_private *id_priv, int timeout_ms) +{ + struct cma_work *work; + + work = kzalloc(sizeof *work, GFP_KERNEL); + if (!work) + return -ENOMEM; + + work->id = id_priv; + INIT_WORK(&work->work, cma_work_handler); + work->old_state = CMA_ROUTE_QUERY; + work->new_state = CMA_ROUTE_RESOLVED; + work->event.event = RDMA_CM_EVENT_ROUTE_RESOLVED; + queue_work(cma_wq, &work->work); + return 0; +} + +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 (rdma_node_get_transport(id->device->node_type)) { + case RDMA_TRANSPORT_IB: + ret = cma_resolve_ib_route(id_priv, timeout_ms); + break; + case RDMA_TRANSPORT_IWARP: + ret = cma_resolve_iw_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); + if (list_empty(&dev_list)) { + ret = -ENODEV; + goto out; + } + 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; + + p = 1; + cma_dev = list_entry(dev_list.next, struct cma_device, list); + +port_found: + 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_sgid(&id_priv->id.route.addr.dev_addr, &gid); + 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; + struct rdma_cm_event event; + + memset(&event, 0, sizeof event); + mutex_lock(&id_priv->handler_mutex); + + /* + * Grab mutex to block rdma_destroy_id() from removing the device while + * we're trying to acquire it. + */ + mutex_lock(&lock); + if (!cma_comp_exch(id_priv, CMA_ADDR_QUERY, CMA_ADDR_RESOLVED)) { + mutex_unlock(&lock); + goto out; + } + + if (!status && !id_priv->cma_dev) + status = cma_acquire_dev(id_priv); + mutex_unlock(&lock); + + if (status) { + if (!cma_comp_exch(id_priv, CMA_ADDR_RESOLVED, CMA_ADDR_BOUND)) + goto out; + event.event = RDMA_CM_EVENT_ADDR_ERROR; + event.status = status; + } else { + memcpy(&id_priv->id.route.addr.src_addr, src_addr, + ip_addr_size(src_addr)); + event.event = RDMA_CM_EVENT_ADDR_RESOLVED; + } + + if (id_priv->id.event_handler(&id_priv->id, &event)) { + cma_exch(id_priv, CMA_DESTROYING); + mutex_unlock(&id_priv->handler_mutex); + cma_deref_id(id_priv); + rdma_destroy_id(&id_priv->id); + return; + } +out: + mutex_unlock(&id_priv->handler_mutex); + 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; + union ib_gid gid; + 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_get_sgid(&id_priv->id.route.addr.dev_addr, &gid); + ib_addr_set_dgid(&id_priv->id.route.addr.dev_addr, &gid); + + if (cma_zero_addr((struct sockaddr *) &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->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(&addr_client, (struct sockaddr *) &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, ret; + + bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL); + if (!bind_list) + return -ENOMEM; + + do { + ret = idr_get_new_above(ps, bind_list, snum, &port); + } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL)); + + if (ret) + goto err1; + + if (port != snum) { + ret = -EADDRNOTAVAIL; + goto err2; + } + + bind_list->ps = ps; + bind_list->port = (unsigned short) port; + cma_bind_port(bind_list, id_priv); + return 0; +err2: + idr_remove(ps, port); +err1: + kfree(bind_list); + return ret; +} + +static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv) +{ + struct rdma_bind_list *bind_list; + int port, ret, low, high; + + bind_list = kzalloc(sizeof *bind_list, GFP_KERNEL); + if (!bind_list) + return -ENOMEM; + +retry: + /* FIXME: add proper port randomization per like inet_csk_get_port */ + do { + ret = idr_get_new_above(ps, bind_list, next_port, &port); + } while ((ret == -EAGAIN) && idr_pre_get(ps, GFP_KERNEL)); + + if (ret) + goto err1; + + inet_get_local_port_range(&low, &high); + if (port > high) { + if (next_port != low) { + idr_remove(ps, port); + next_port = low; + goto retry; + } + ret = -EADDRNOTAVAIL; + goto err2; + } + + if (port == high) + next_port = low; + else + next_port = port + 1; + + bind_list->ps = ps; + bind_list->port = (unsigned short) port; + cma_bind_port(bind_list, id_priv); + return 0; +err2: + idr_remove(ps, port); +err1: + 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((struct sockaddr *) &id_priv->id.route.addr.src_addr)) + return -EADDRNOTAVAIL; + + hlist_for_each_entry(cur_id, node, &bind_list->owners, node) { + if (cma_any_addr((struct sockaddr *) &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; + case RDMA_PS_UDP: + ps = &udp_ps; + break; + case RDMA_PS_IPOIB: + ps = &ipoib_ps; + break; + default: + return -EPROTONOSUPPORT; + } + + mutex_lock(&lock); + if (cma_any_port((struct sockaddr *) &id_priv->id.route.addr.src_addr)) + ret = cma_alloc_any_port(ps, id_priv); + 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) + goto err1; + + mutex_lock(&lock); + ret = cma_acquire_dev(id_priv); + mutex_unlock(&lock); + if (ret) + goto err1; + } + + memcpy(&id->route.addr.src_addr, addr, ip_addr_size(addr)); + ret = cma_get_port(id_priv); + if (ret) + goto err2; + + return 0; +err2: + if (!cma_any_addr(addr)) { + mutex_lock(&lock); + cma_detach_from_dev(id_priv); + mutex_unlock(&lock); + } +err1: + 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_sidr_rep_handler(struct ib_cm_id *cm_id, + struct ib_cm_event *ib_event) +{ + struct rdma_id_private *id_priv = cm_id->context; + struct rdma_cm_event event; + struct ib_cm_sidr_rep_event_param *rep = &ib_event->param.sidr_rep_rcvd; + int ret = 0; + + if (cma_disable_callback(id_priv, CMA_CONNECT)) + return 0; + + memset(&event, 0, sizeof event); + switch (ib_event->event) { + case IB_CM_SIDR_REQ_ERROR: + event.event = RDMA_CM_EVENT_UNREACHABLE; + event.status = -ETIMEDOUT; + break; + case IB_CM_SIDR_REP_RECEIVED: + event.param.ud.private_data = ib_event->private_data; + event.param.ud.private_data_len = IB_CM_SIDR_REP_PRIVATE_DATA_SIZE; + if (rep->status != IB_SIDR_SUCCESS) { + event.event = RDMA_CM_EVENT_UNREACHABLE; + event.status = ib_event->param.sidr_rep_rcvd.status; + break; + } + if (id_priv->qkey != rep->qkey) { + event.event = RDMA_CM_EVENT_UNREACHABLE; + event.status = -EINVAL; + break; + } + ib_init_ah_from_path(id_priv->id.device, id_priv->id.port_num, + id_priv->id.route.path_rec, + &event.param.ud.ah_attr); + event.param.ud.qp_num = rep->qpn; + event.param.ud.qkey = rep->qkey; + event.event = RDMA_CM_EVENT_ESTABLISHED; + event.status = 0; + break; + default: + printk(KERN_ERR "RDMA CMA: unexpected IB CM event: %d\n", + ib_event->event); + goto out; + } + + ret = id_priv->id.event_handler(&id_priv->id, &event); + if (ret) { + /* Destroy the CM ID by returning a non-zero value. */ + id_priv->cm_id.ib = NULL; + cma_exch(id_priv, CMA_DESTROYING); + mutex_unlock(&id_priv->handler_mutex); + rdma_destroy_id(&id_priv->id); + return ret; + } +out: + mutex_unlock(&id_priv->handler_mutex); + return ret; +} + +static int cma_resolve_ib_udp(struct rdma_id_private *id_priv, + struct rdma_conn_param *conn_param) +{ + struct ib_cm_sidr_req_param req; + struct rdma_route *route; + int ret; + + req.private_data_len = sizeof(struct cma_hdr) + + conn_param->private_data_len; + req.private_data = kzalloc(req.private_data_len, GFP_ATOMIC); + if (!req.private_data) + return -ENOMEM; + + if (conn_param->private_data && conn_param->private_data_len) + memcpy((void *) req.private_data + sizeof(struct cma_hdr), + conn_param->private_data, conn_param->private_data_len); + + route = &id_priv->id.route; + ret = cma_format_hdr((void *) req.private_data, id_priv->id.ps, route); + if (ret) + goto out; + + id_priv->cm_id.ib = ib_create_cm_id(id_priv->id.device, + cma_sidr_rep_handler, id_priv); + if (IS_ERR(id_priv->cm_id.ib)) { + ret = PTR_ERR(id_priv->cm_id.ib); + goto out; + } + + req.path = route->path_rec; + req.service_id = cma_get_service_id(id_priv->id.ps, + (struct sockaddr *) &route->addr.dst_addr); + req.timeout_ms = 1 << (CMA_CM_RESPONSE_TIMEOUT - 8); + req.max_cm_retries = CMA_MAX_CM_RETRIES; + + ret = ib_send_cm_sidr_req(id_priv->cm_id.ib, &req); + if (ret) { + ib_destroy_cm_id(id_priv->cm_id.ib); + id_priv->cm_id.ib = NULL; + } +out: + kfree(req.private_data); + return ret; +} + +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, + (struct sockaddr *) &route->addr.dst_addr); + req.qp_num = id_priv->qp_num; + req.qp_type = IB_QPT_RC; + 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: + if (ret && !IS_ERR(id_priv->cm_id.ib)) { + ib_destroy_cm_id(id_priv->cm_id.ib); + id_priv->cm_id.ib = NULL; + } + + kfree(private_data); + return ret; +} + +static int cma_connect_iw(struct rdma_id_private *id_priv, + struct rdma_conn_param *conn_param) +{ + struct iw_cm_id *cm_id; + struct sockaddr_in* sin; + int ret; + struct iw_cm_conn_param iw_param; + + cm_id = iw_create_cm_id(id_priv->id.device, cma_iw_handler, id_priv); + if (IS_ERR(cm_id)) { + ret = PTR_ERR(cm_id); + goto out; + } + + id_priv->cm_id.iw = cm_id; + + sin = (struct sockaddr_in*) &id_priv->id.route.addr.src_addr; + cm_id->local_addr = *sin; + + sin = (struct sockaddr_in*) &id_priv->id.route.addr.dst_addr; + cm_id->remote_addr = *sin; + + ret = cma_modify_qp_rtr(id_priv, conn_param); + if (ret) + goto out; + + iw_param.ord = conn_param->initiator_depth; + iw_param.ird = conn_param->responder_resources; + iw_param.private_data = conn_param->private_data; + iw_param.private_data_len = conn_param->private_data_len; + if (id_priv->id.qp) + iw_param.qpn = id_priv->qp_num; + else + iw_param.qpn = conn_param->qp_num; + ret = iw_cm_connect(cm_id, &iw_param); +out: + if (ret && !IS_ERR(cm_id)) { + iw_destroy_cm_id(cm_id); + id_priv->cm_id.iw = NULL; + } + 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->srq = conn_param->srq; + } + + switch (rdma_node_get_transport(id->device->node_type)) { + case RDMA_TRANSPORT_IB: + if (cma_is_ud_ps(id->ps)) + ret = cma_resolve_ib_udp(id_priv, conn_param); + else + ret = cma_connect_ib(id_priv, conn_param); + break; + case RDMA_TRANSPORT_IWARP: + ret = cma_connect_iw(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, conn_param); + if (ret) + goto out; + + ret = cma_modify_qp_rts(id_priv, conn_param); + if (ret) + goto out; + + 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.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; + + ret = ib_send_cm_rep(id_priv->cm_id.ib, &rep); +out: + return ret; +} + +static int cma_accept_iw(struct rdma_id_private *id_priv, + struct rdma_conn_param *conn_param) +{ + struct iw_cm_conn_param iw_param; + int ret; + + ret = cma_modify_qp_rtr(id_priv, conn_param); + if (ret) + return ret; + + iw_param.ord = conn_param->initiator_depth; + iw_param.ird = conn_param->responder_resources; + iw_param.private_data = conn_param->private_data; + iw_param.private_data_len = conn_param->private_data_len; + if (id_priv->id.qp) { + iw_param.qpn = id_priv->qp_num; + } else + iw_param.qpn = conn_param->qp_num; + + return iw_cm_accept(id_priv->cm_id.iw, &iw_param); +} + +static int cma_send_sidr_rep(struct rdma_id_private *id_priv, + enum ib_cm_sidr_status status, + const void *private_data, int private_data_len) +{ + struct ib_cm_sidr_rep_param rep; + + memset(&rep, 0, sizeof rep); + rep.status = status; + if (status == IB_SIDR_SUCCESS) { + rep.qp_num = id_priv->qp_num; + rep.qkey = id_priv->qkey; + } + rep.private_data = private_data; + rep.private_data_len = private_data_len; + + return ib_send_cm_sidr_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->srq = conn_param->srq; + } + + switch (rdma_node_get_transport(id->device->node_type)) { + case RDMA_TRANSPORT_IB: + if (cma_is_ud_ps(id->ps)) + ret = cma_send_sidr_rep(id_priv, IB_SIDR_SUCCESS, + conn_param->private_data, + conn_param->private_data_len); + else if (conn_param) + ret = cma_accept_ib(id_priv, conn_param); + else + ret = cma_rep_recv(id_priv); + break; + case RDMA_TRANSPORT_IWARP: + ret = cma_accept_iw(id_priv, conn_param); + break; + default: + ret = -ENOSYS; + break; + } + + if (ret) + goto reject; + + return 0; +reject: + cma_modify_qp_err(id_priv); + rdma_reject(id, NULL, 0); + return ret; +} +EXPORT_SYMBOL(rdma_accept); + +int rdma_notify(struct rdma_cm_id *id, enum ib_event_type event) +{ + struct rdma_id_private *id_priv; + int ret; + + id_priv = container_of(id, struct rdma_id_private, id); + if (!cma_has_cm_dev(id_priv)) + return -EINVAL; + + switch (id->device->node_type) { + case RDMA_NODE_IB_CA: + ret = ib_cm_notify(id_priv->cm_id.ib, event); + break; + default: + ret = 0; + break; + } + return ret; +} +EXPORT_SYMBOL(rdma_notify); + +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_has_cm_dev(id_priv)) + return -EINVAL; + + switch (rdma_node_get_transport(id->device->node_type)) { + case RDMA_TRANSPORT_IB: + if (cma_is_ud_ps(id->ps)) + ret = cma_send_sidr_rep(id_priv, IB_SIDR_REJECT, + private_data, private_data_len); + else + ret = ib_send_cm_rej(id_priv->cm_id.ib, + IB_CM_REJ_CONSUMER_DEFINED, NULL, + 0, private_data, private_data_len); + break; + case RDMA_TRANSPORT_IWARP: + ret = iw_cm_reject(id_priv->cm_id.iw, + 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_has_cm_dev(id_priv)) + return -EINVAL; + + switch (rdma_node_get_transport(id->device->node_type)) { + case RDMA_TRANSPORT_IB: + ret = cma_modify_qp_err(id_priv); + if (ret) + goto out; + /* 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; + case RDMA_TRANSPORT_IWARP: + ret = iw_cm_disconnect(id_priv->cm_id.iw, 0); + break; + default: + ret = -EINVAL; + break; + } +out: + return ret; +} +EXPORT_SYMBOL(rdma_disconnect); + +static int cma_ib_mc_handler(int status, struct ib_sa_multicast *multicast) +{ + struct rdma_id_private *id_priv; + struct cma_multicast *mc = multicast->context; + struct rdma_cm_event event; + int ret; + + id_priv = mc->id_priv; + if (cma_disable_callback(id_priv, CMA_ADDR_BOUND) && + cma_disable_callback(id_priv, CMA_ADDR_RESOLVED)) + return 0; + + mutex_lock(&id_priv->qp_mutex); + if (!status && id_priv->id.qp) + status = ib_attach_mcast(id_priv->id.qp, &multicast->rec.mgid, + multicast->rec.mlid); + mutex_unlock(&id_priv->qp_mutex); + + memset(&event, 0, sizeof event); + event.status = status; + event.param.ud.private_data = mc->context; + if (!status) { + event.event = RDMA_CM_EVENT_MULTICAST_JOIN; + ib_init_ah_from_mcmember(id_priv->id.device, + id_priv->id.port_num, &multicast->rec, + &event.param.ud.ah_attr); + event.param.ud.qp_num = 0xFFFFFF; + event.param.ud.qkey = be32_to_cpu(multicast->rec.qkey); + } else + event.event = RDMA_CM_EVENT_MULTICAST_ERROR; + + ret = id_priv->id.event_handler(&id_priv->id, &event); + if (ret) { + cma_exch(id_priv, CMA_DESTROYING); + mutex_unlock(&id_priv->handler_mutex); + rdma_destroy_id(&id_priv->id); + return 0; + } + + mutex_unlock(&id_priv->handler_mutex); + return 0; +} + +static void cma_set_mgid(struct rdma_id_private *id_priv, + struct sockaddr *addr, union ib_gid *mgid) +{ + unsigned char mc_map[MAX_ADDR_LEN]; + struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; + struct sockaddr_in *sin = (struct sockaddr_in *) addr; + struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) addr; + + if (cma_any_addr(addr)) { + memset(mgid, 0, sizeof *mgid); + } else if ((addr->sa_family == AF_INET6) && + ((be32_to_cpu(sin6->sin6_addr.s6_addr32[0]) & 0xFF10A01B) == + 0xFF10A01B)) { + /* IPv6 address is an SA assigned MGID. */ + memcpy(mgid, &sin6->sin6_addr, sizeof *mgid); + } else { + ip_ib_mc_map(sin->sin_addr.s_addr, dev_addr->broadcast, mc_map); + if (id_priv->id.ps == RDMA_PS_UDP) + mc_map[7] = 0x01; /* Use RDMA CM signature */ + *mgid = *(union ib_gid *) (mc_map + 4); + } +} + +static int cma_join_ib_multicast(struct rdma_id_private *id_priv, + struct cma_multicast *mc) +{ + struct ib_sa_mcmember_rec rec; + struct rdma_dev_addr *dev_addr = &id_priv->id.route.addr.dev_addr; + ib_sa_comp_mask comp_mask; + int ret; + + ib_addr_get_mgid(dev_addr, &rec.mgid); + ret = ib_sa_get_mcmember_rec(id_priv->id.device, id_priv->id.port_num, + &rec.mgid, &rec); + if (ret) + return ret; + + cma_set_mgid(id_priv, (struct sockaddr *) &mc->addr, &rec.mgid); + if (id_priv->id.ps == RDMA_PS_UDP) + rec.qkey = cpu_to_be32(RDMA_UDP_QKEY); + ib_addr_get_sgid(dev_addr, &rec.port_gid); + rec.pkey = cpu_to_be16(ib_addr_get_pkey(dev_addr)); + rec.join_state = 1; + + comp_mask = IB_SA_MCMEMBER_REC_MGID | IB_SA_MCMEMBER_REC_PORT_GID | + IB_SA_MCMEMBER_REC_PKEY | IB_SA_MCMEMBER_REC_JOIN_STATE | + IB_SA_MCMEMBER_REC_QKEY | IB_SA_MCMEMBER_REC_SL | + IB_SA_MCMEMBER_REC_FLOW_LABEL | + IB_SA_MCMEMBER_REC_TRAFFIC_CLASS; + + mc->multicast.ib = ib_sa_join_multicast(&sa_client, id_priv->id.device, + id_priv->id.port_num, &rec, + comp_mask, GFP_KERNEL, + cma_ib_mc_handler, mc); + if (IS_ERR(mc->multicast.ib)) + return PTR_ERR(mc->multicast.ib); + + return 0; +} + +int rdma_join_multicast(struct rdma_cm_id *id, struct sockaddr *addr, + void *context) +{ + struct rdma_id_private *id_priv; + struct cma_multicast *mc; + int ret; + + id_priv = container_of(id, struct rdma_id_private, id); + if (!cma_comp(id_priv, CMA_ADDR_BOUND) && + !cma_comp(id_priv, CMA_ADDR_RESOLVED)) + return -EINVAL; + + mc = kmalloc(sizeof *mc, GFP_KERNEL); + if (!mc) + return -ENOMEM; + + memcpy(&mc->addr, addr, ip_addr_size(addr)); + mc->context = context; + mc->id_priv = id_priv; + + spin_lock(&id_priv->lock); + list_add(&mc->list, &id_priv->mc_list); + spin_unlock(&id_priv->lock); + + switch (rdma_node_get_transport(id->device->node_type)) { + case RDMA_TRANSPORT_IB: + ret = cma_join_ib_multicast(id_priv, mc); + break; + default: + ret = -ENOSYS; + break; + } + + if (ret) { + spin_lock_irq(&id_priv->lock); + list_del(&mc->list); + spin_unlock_irq(&id_priv->lock); + kfree(mc); + } + return ret; +} +EXPORT_SYMBOL(rdma_join_multicast); + +void rdma_leave_multicast(struct rdma_cm_id *id, struct sockaddr *addr) +{ + struct rdma_id_private *id_priv; + struct cma_multicast *mc; + + id_priv = container_of(id, struct rdma_id_private, id); + spin_lock_irq(&id_priv->lock); + list_for_each_entry(mc, &id_priv->mc_list, list) { + if (!memcmp(&mc->addr, addr, ip_addr_size(addr))) { + list_del(&mc->list); + spin_unlock_irq(&id_priv->lock); + + if (id->qp) + ib_detach_mcast(id->qp, + &mc->multicast.ib->rec.mgid, + mc->multicast.ib->rec.mlid); + ib_sa_free_multicast(mc->multicast.ib); + kfree(mc); + return; + } + } + spin_unlock_irq(&id_priv->lock); +} +EXPORT_SYMBOL(rdma_leave_multicast); + +static int cma_netdev_change(struct net_device *ndev, struct rdma_id_private *id_priv) +{ + struct rdma_dev_addr *dev_addr; + struct cma_ndev_work *work; + + dev_addr = &id_priv->id.route.addr.dev_addr; + + if ((dev_addr->src_dev == ndev) && + memcmp(dev_addr->src_dev_addr, ndev->dev_addr, ndev->addr_len)) { + printk(KERN_INFO "RDMA CM addr change for ndev %s used by id %p\n", + ndev->name, &id_priv->id); + work = kzalloc(sizeof *work, GFP_KERNEL); + if (!work) + return -ENOMEM; + + INIT_WORK(&work->work, cma_ndev_work_handler); + work->id = id_priv; + work->event.event = RDMA_CM_EVENT_ADDR_CHANGE; + atomic_inc(&id_priv->refcount); + queue_work(cma_wq, &work->work); + } + + return 0; +} + +static int cma_netdev_callback(struct notifier_block *self, unsigned long event, + void *ctx) +{ + struct net_device *ndev = (struct net_device *)ctx; + struct cma_device *cma_dev; + struct rdma_id_private *id_priv; + int ret = NOTIFY_DONE; + + if (dev_net(ndev) != &init_net) + return NOTIFY_DONE; + + if (event != NETDEV_BONDING_FAILOVER) + return NOTIFY_DONE; + + if (!(ndev->flags & IFF_MASTER) || !(ndev->priv_flags & IFF_BONDING)) + return NOTIFY_DONE; + + mutex_lock(&lock); + list_for_each_entry(cma_dev, &dev_list, list) + list_for_each_entry(id_priv, &cma_dev->id_list, list) { + ret = cma_netdev_change(ndev, id_priv); + if (ret) + goto out; + } + +out: + mutex_unlock(&lock); + return ret; +} + +static struct notifier_block cma_nb = { + .notifier_call = cma_netdev_callback +}; + +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; + + 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); +} + +static int cma_remove_id_dev(struct rdma_id_private *id_priv) +{ + struct rdma_cm_event event; + enum cma_state state; + int ret = 0; + + /* 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); + mutex_lock(&id_priv->handler_mutex); + + /* Check for destruction from another callback. */ + if (!cma_comp(id_priv, CMA_DEVICE_REMOVAL)) + goto out; + + memset(&event, 0, sizeof event); + event.event = RDMA_CM_EVENT_DEVICE_REMOVAL; + ret = id_priv->id.event_handler(&id_priv->id, &event); +out: + mutex_unlock(&id_priv->handler_mutex); + return ret; +} + +static void cma_process_remove(struct cma_device *cma_dev) +{ + struct rdma_id_private *id_priv; + int ret; + + mutex_lock(&lock); + while (!list_empty(&cma_dev->id_list)) { + id_priv = list_entry(cma_dev->id_list.next, + struct rdma_id_private, list); + + list_del(&id_priv->listen_list); + list_del_init(&id_priv->list); + atomic_inc(&id_priv->refcount); + mutex_unlock(&lock); + + ret = id_priv->internal_id ? 1 : 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, low, high, remaining; + + get_random_bytes(&next_port, sizeof next_port); + inet_get_local_port_range(&low, &high); + remaining = (high - low) + 1; + next_port = ((unsigned int) next_port % remaining) + low; + + cma_wq = create_singlethread_workqueue("rdma_cm"); + if (!cma_wq) + return -ENOMEM; + + ib_sa_register_client(&sa_client); + rdma_addr_register_client(&addr_client); + register_netdevice_notifier(&cma_nb); + + ret = ib_register_client(&cma_client); + if (ret) + goto err; + return 0; + +err: + unregister_netdevice_notifier(&cma_nb); + rdma_addr_unregister_client(&addr_client); + ib_sa_unregister_client(&sa_client); + destroy_workqueue(cma_wq); + return ret; +} + +static void cma_cleanup(void) +{ + ib_unregister_client(&cma_client); + unregister_netdevice_notifier(&cma_nb); + rdma_addr_unregister_client(&addr_client); + ib_sa_unregister_client(&sa_client); + destroy_workqueue(cma_wq); + idr_destroy(&sdp_ps); + idr_destroy(&tcp_ps); + idr_destroy(&udp_ps); + idr_destroy(&ipoib_ps); +} + +module_init(cma_init); +module_exit(cma_cleanup); |
