From 2ca546b92a024d07adedd15b4c262b1c2c0786ec Mon Sep 17 00:00:00 2001 From: Kaike Wan Date: Fri, 14 Aug 2015 08:52:09 -0400 Subject: [PATCH] IB/sa: Route SA pathrecord query through netlink This patch routes a SA pathrecord query to netlink first and processes the response appropriately. If a failure is returned, the request will be sent through IB. The decision whether to route the request to netlink first is determined by the presence of a listener for the local service netlink multicast group. If the user-space local service netlink multicast group listener is not present, the request will be sent through IB, just like what is currently being done. Signed-off-by: Kaike Wan Signed-off-by: John Fleck Signed-off-by: Ira Weiny Signed-off-by: Doug Ledford --- drivers/infiniband/core/sa_query.c | 501 ++++++++++++++++++++++++++++- 1 file changed, 500 insertions(+), 1 deletion(-) diff --git a/drivers/infiniband/core/sa_query.c b/drivers/infiniband/core/sa_query.c index 968c66f1c585..edcf568dab48 100644 --- a/drivers/infiniband/core/sa_query.c +++ b/drivers/infiniband/core/sa_query.c @@ -45,12 +45,21 @@ #include #include #include +#include +#include +#include +#include #include "sa.h" MODULE_AUTHOR("Roland Dreier"); MODULE_DESCRIPTION("InfiniBand subnet administration query support"); MODULE_LICENSE("Dual BSD/GPL"); +#define IB_SA_LOCAL_SVC_TIMEOUT_MIN 100 +#define IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT 2000 +#define IB_SA_LOCAL_SVC_TIMEOUT_MAX 200000 +static int sa_local_svc_timeout_ms = IB_SA_LOCAL_SVC_TIMEOUT_DEFAULT; + struct ib_sa_sm_ah { struct ib_ah *ah; struct kref ref; @@ -80,8 +89,16 @@ struct ib_sa_query { struct ib_mad_send_buf *mad_buf; struct ib_sa_sm_ah *sm_ah; int id; + u32 flags; + struct list_head list; /* Local svc request list */ + u32 seq; /* Local svc request sequence number */ + unsigned long timeout; /* Local svc timeout */ + u8 path_use; /* How will the pathrecord be used */ }; +#define IB_SA_ENABLE_LOCAL_SERVICE 0x00000001 +#define IB_SA_CANCEL 0x00000002 + struct ib_sa_service_query { void (*callback)(int, struct ib_sa_service_rec *, void *); void *context; @@ -106,6 +123,26 @@ struct ib_sa_mcmember_query { struct ib_sa_query sa_query; }; +static LIST_HEAD(ib_nl_request_list); +static DEFINE_SPINLOCK(ib_nl_request_lock); +static atomic_t ib_nl_sa_request_seq; +static struct workqueue_struct *ib_nl_wq; +static struct delayed_work ib_nl_timed_work; +static const struct nla_policy ib_nl_policy[LS_NLA_TYPE_MAX] = { + [LS_NLA_TYPE_PATH_RECORD] = {.type = NLA_BINARY, + .len = sizeof(struct ib_path_rec_data)}, + [LS_NLA_TYPE_TIMEOUT] = {.type = NLA_U32}, + [LS_NLA_TYPE_SERVICE_ID] = {.type = NLA_U64}, + [LS_NLA_TYPE_DGID] = {.type = NLA_BINARY, + .len = sizeof(struct rdma_nla_ls_gid)}, + [LS_NLA_TYPE_SGID] = {.type = NLA_BINARY, + .len = sizeof(struct rdma_nla_ls_gid)}, + [LS_NLA_TYPE_TCLASS] = {.type = NLA_U8}, + [LS_NLA_TYPE_PKEY] = {.type = NLA_U16}, + [LS_NLA_TYPE_QOS_CLASS] = {.type = NLA_U16}, +}; + + static void ib_sa_add_one(struct ib_device *device); static void ib_sa_remove_one(struct ib_device *device, void *client_data); @@ -381,6 +418,427 @@ static const struct ib_field guidinfo_rec_table[] = { .size_bits = 512 }, }; +static inline void ib_sa_disable_local_svc(struct ib_sa_query *query) +{ + query->flags &= ~IB_SA_ENABLE_LOCAL_SERVICE; +} + +static inline int ib_sa_query_cancelled(struct ib_sa_query *query) +{ + return (query->flags & IB_SA_CANCEL); +} + +static void ib_nl_set_path_rec_attrs(struct sk_buff *skb, + struct ib_sa_query *query) +{ + struct ib_sa_path_rec *sa_rec = query->mad_buf->context[1]; + struct ib_sa_mad *mad = query->mad_buf->mad; + ib_sa_comp_mask comp_mask = mad->sa_hdr.comp_mask; + u16 val16; + u64 val64; + struct rdma_ls_resolve_header *header; + + query->mad_buf->context[1] = NULL; + + /* Construct the family header first */ + header = (struct rdma_ls_resolve_header *) + skb_put(skb, NLMSG_ALIGN(sizeof(*header))); + memcpy(header->device_name, query->port->agent->device->name, + LS_DEVICE_NAME_MAX); + header->port_num = query->port->port_num; + + if ((comp_mask & IB_SA_PATH_REC_REVERSIBLE) && + sa_rec->reversible != 0) + query->path_use = LS_RESOLVE_PATH_USE_GMP; + else + query->path_use = LS_RESOLVE_PATH_USE_UNIDIRECTIONAL; + header->path_use = query->path_use; + + /* Now build the attributes */ + if (comp_mask & IB_SA_PATH_REC_SERVICE_ID) { + val64 = be64_to_cpu(sa_rec->service_id); + nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SERVICE_ID, + sizeof(val64), &val64); + } + if (comp_mask & IB_SA_PATH_REC_DGID) + nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_DGID, + sizeof(sa_rec->dgid), &sa_rec->dgid); + if (comp_mask & IB_SA_PATH_REC_SGID) + nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_SGID, + sizeof(sa_rec->sgid), &sa_rec->sgid); + if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS) + nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_TCLASS, + sizeof(sa_rec->traffic_class), &sa_rec->traffic_class); + + if (comp_mask & IB_SA_PATH_REC_PKEY) { + val16 = be16_to_cpu(sa_rec->pkey); + nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_PKEY, + sizeof(val16), &val16); + } + if (comp_mask & IB_SA_PATH_REC_QOS_CLASS) { + val16 = be16_to_cpu(sa_rec->qos_class); + nla_put(skb, RDMA_NLA_F_MANDATORY | LS_NLA_TYPE_QOS_CLASS, + sizeof(val16), &val16); + } +} + +static int ib_nl_get_path_rec_attrs_len(ib_sa_comp_mask comp_mask) +{ + int len = 0; + + if (comp_mask & IB_SA_PATH_REC_SERVICE_ID) + len += nla_total_size(sizeof(u64)); + if (comp_mask & IB_SA_PATH_REC_DGID) + len += nla_total_size(sizeof(struct rdma_nla_ls_gid)); + if (comp_mask & IB_SA_PATH_REC_SGID) + len += nla_total_size(sizeof(struct rdma_nla_ls_gid)); + if (comp_mask & IB_SA_PATH_REC_TRAFFIC_CLASS) + len += nla_total_size(sizeof(u8)); + if (comp_mask & IB_SA_PATH_REC_PKEY) + len += nla_total_size(sizeof(u16)); + if (comp_mask & IB_SA_PATH_REC_QOS_CLASS) + len += nla_total_size(sizeof(u16)); + + /* + * Make sure that at least some of the required comp_mask bits are + * set. + */ + if (WARN_ON(len == 0)) + return len; + + /* Add the family header */ + len += NLMSG_ALIGN(sizeof(struct rdma_ls_resolve_header)); + + return len; +} + +static int ib_nl_send_msg(struct ib_sa_query *query) +{ + struct sk_buff *skb = NULL; + struct nlmsghdr *nlh; + void *data; + int ret = 0; + struct ib_sa_mad *mad; + int len; + + mad = query->mad_buf->mad; + len = ib_nl_get_path_rec_attrs_len(mad->sa_hdr.comp_mask); + if (len <= 0) + return -EMSGSIZE; + + skb = nlmsg_new(len, GFP_KERNEL); + if (!skb) + return -ENOMEM; + + /* Put nlmsg header only for now */ + data = ibnl_put_msg(skb, &nlh, query->seq, 0, RDMA_NL_LS, + RDMA_NL_LS_OP_RESOLVE, (int) GFP_KERNEL); + if (!data) { + kfree_skb(skb); + return -EMSGSIZE; + } + + /* Add attributes */ + ib_nl_set_path_rec_attrs(skb, query); + + /* Repair the nlmsg header length */ + nlmsg_end(skb, nlh); + + ret = ibnl_multicast(skb, nlh, RDMA_NL_GROUP_LS, GFP_KERNEL); + if (!ret) + ret = len; + else + ret = 0; + + return ret; +} + +static int ib_nl_make_request(struct ib_sa_query *query) +{ + unsigned long flags; + unsigned long delay; + int ret; + + INIT_LIST_HEAD(&query->list); + query->seq = (u32)atomic_inc_return(&ib_nl_sa_request_seq); + + spin_lock_irqsave(&ib_nl_request_lock, flags); + ret = ib_nl_send_msg(query); + if (ret <= 0) { + ret = -EIO; + goto request_out; + } else { + ret = 0; + } + + delay = msecs_to_jiffies(sa_local_svc_timeout_ms); + query->timeout = delay + jiffies; + list_add_tail(&query->list, &ib_nl_request_list); + /* Start the timeout if this is the only request */ + if (ib_nl_request_list.next == &query->list) + queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay); + +request_out: + spin_unlock_irqrestore(&ib_nl_request_lock, flags); + + return ret; +} + +static int ib_nl_cancel_request(struct ib_sa_query *query) +{ + unsigned long flags; + struct ib_sa_query *wait_query; + int found = 0; + + spin_lock_irqsave(&ib_nl_request_lock, flags); + list_for_each_entry(wait_query, &ib_nl_request_list, list) { + /* Let the timeout to take care of the callback */ + if (query == wait_query) { + query->flags |= IB_SA_CANCEL; + query->timeout = jiffies; + list_move(&query->list, &ib_nl_request_list); + found = 1; + mod_delayed_work(ib_nl_wq, &ib_nl_timed_work, 1); + break; + } + } + spin_unlock_irqrestore(&ib_nl_request_lock, flags); + + return found; +} + +static void send_handler(struct ib_mad_agent *agent, + struct ib_mad_send_wc *mad_send_wc); + +static void ib_nl_process_good_resolve_rsp(struct ib_sa_query *query, + const struct nlmsghdr *nlh) +{ + struct ib_mad_send_wc mad_send_wc; + struct ib_sa_mad *mad = NULL; + const struct nlattr *head, *curr; + struct ib_path_rec_data *rec; + int len, rem; + u32 mask = 0; + int status = -EIO; + + if (query->callback) { + head = (const struct nlattr *) nlmsg_data(nlh); + len = nlmsg_len(nlh); + switch (query->path_use) { + case LS_RESOLVE_PATH_USE_UNIDIRECTIONAL: + mask = IB_PATH_PRIMARY | IB_PATH_OUTBOUND; + break; + + case LS_RESOLVE_PATH_USE_ALL: + case LS_RESOLVE_PATH_USE_GMP: + default: + mask = IB_PATH_PRIMARY | IB_PATH_GMP | + IB_PATH_BIDIRECTIONAL; + break; + } + nla_for_each_attr(curr, head, len, rem) { + if (curr->nla_type == LS_NLA_TYPE_PATH_RECORD) { + rec = nla_data(curr); + /* + * Get the first one. In the future, we may + * need to get up to 6 pathrecords. + */ + if ((rec->flags & mask) == mask) { + mad = query->mad_buf->mad; + mad->mad_hdr.method |= + IB_MGMT_METHOD_RESP; + memcpy(mad->data, rec->path_rec, + sizeof(rec->path_rec)); + status = 0; + break; + } + } + } + query->callback(query, status, mad); + } + + mad_send_wc.send_buf = query->mad_buf; + mad_send_wc.status = IB_WC_SUCCESS; + send_handler(query->mad_buf->mad_agent, &mad_send_wc); +} + +static void ib_nl_request_timeout(struct work_struct *work) +{ + unsigned long flags; + struct ib_sa_query *query; + unsigned long delay; + struct ib_mad_send_wc mad_send_wc; + int ret; + + spin_lock_irqsave(&ib_nl_request_lock, flags); + while (!list_empty(&ib_nl_request_list)) { + query = list_entry(ib_nl_request_list.next, + struct ib_sa_query, list); + + if (time_after(query->timeout, jiffies)) { + delay = query->timeout - jiffies; + if ((long)delay <= 0) + delay = 1; + queue_delayed_work(ib_nl_wq, &ib_nl_timed_work, delay); + break; + } + + list_del(&query->list); + ib_sa_disable_local_svc(query); + /* Hold the lock to protect against query cancellation */ + if (ib_sa_query_cancelled(query)) + ret = -1; + else + ret = ib_post_send_mad(query->mad_buf, NULL); + if (ret) { + mad_send_wc.send_buf = query->mad_buf; + mad_send_wc.status = IB_WC_WR_FLUSH_ERR; + spin_unlock_irqrestore(&ib_nl_request_lock, flags); + send_handler(query->port->agent, &mad_send_wc); + spin_lock_irqsave(&ib_nl_request_lock, flags); + } + } + spin_unlock_irqrestore(&ib_nl_request_lock, flags); +} + +static int ib_nl_handle_set_timeout(struct sk_buff *skb, + struct netlink_callback *cb) +{ + const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh; + int timeout, delta, abs_delta; + const struct nlattr *attr; + unsigned long flags; + struct ib_sa_query *query; + long delay = 0; + struct nlattr *tb[LS_NLA_TYPE_MAX]; + int ret; + + if (!netlink_capable(skb, CAP_NET_ADMIN)) + return -EPERM; + + ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh), + nlmsg_len(nlh), ib_nl_policy); + attr = (const struct nlattr *)tb[LS_NLA_TYPE_TIMEOUT]; + if (ret || !attr) + goto settimeout_out; + + timeout = *(int *) nla_data(attr); + if (timeout < IB_SA_LOCAL_SVC_TIMEOUT_MIN) + timeout = IB_SA_LOCAL_SVC_TIMEOUT_MIN; + if (timeout > IB_SA_LOCAL_SVC_TIMEOUT_MAX) + timeout = IB_SA_LOCAL_SVC_TIMEOUT_MAX; + + delta = timeout - sa_local_svc_timeout_ms; + if (delta < 0) + abs_delta = -delta; + else + abs_delta = delta; + + if (delta != 0) { + spin_lock_irqsave(&ib_nl_request_lock, flags); + sa_local_svc_timeout_ms = timeout; + list_for_each_entry(query, &ib_nl_request_list, list) { + if (delta < 0 && abs_delta > query->timeout) + query->timeout = 0; + else + query->timeout += delta; + + /* Get the new delay from the first entry */ + if (!delay) { + delay = query->timeout - jiffies; + if (delay <= 0) + delay = 1; + } + } + if (delay) + mod_delayed_work(ib_nl_wq, &ib_nl_timed_work, + (unsigned long)delay); + spin_unlock_irqrestore(&ib_nl_request_lock, flags); + } + +settimeout_out: + return skb->len; +} + +static inline int ib_nl_is_good_resolve_resp(const struct nlmsghdr *nlh) +{ + struct nlattr *tb[LS_NLA_TYPE_MAX]; + int ret; + + if (nlh->nlmsg_flags & RDMA_NL_LS_F_ERR) + return 0; + + ret = nla_parse(tb, LS_NLA_TYPE_MAX - 1, nlmsg_data(nlh), + nlmsg_len(nlh), ib_nl_policy); + if (ret) + return 0; + + return 1; +} + +static int ib_nl_handle_resolve_resp(struct sk_buff *skb, + struct netlink_callback *cb) +{ + const struct nlmsghdr *nlh = (struct nlmsghdr *)cb->nlh; + unsigned long flags; + struct ib_sa_query *query; + struct ib_mad_send_buf *send_buf; + struct ib_mad_send_wc mad_send_wc; + int found = 0; + int ret; + + if (!netlink_capable(skb, CAP_NET_ADMIN)) + return -EPERM; + + spin_lock_irqsave(&ib_nl_request_lock, flags); + list_for_each_entry(query, &ib_nl_request_list, list) { + /* + * If the query is cancelled, let the timeout routine + * take care of it. + */ + if (nlh->nlmsg_seq == query->seq) { + found = !ib_sa_query_cancelled(query); + if (found) + list_del(&query->list); + break; + } + } + + if (!found) { + spin_unlock_irqrestore(&ib_nl_request_lock, flags); + goto resp_out; + } + + send_buf = query->mad_buf; + + if (!ib_nl_is_good_resolve_resp(nlh)) { + /* if the result is a failure, send out the packet via IB */ + ib_sa_disable_local_svc(query); + ret = ib_post_send_mad(query->mad_buf, NULL); + spin_unlock_irqrestore(&ib_nl_request_lock, flags); + if (ret) { + mad_send_wc.send_buf = send_buf; + mad_send_wc.status = IB_WC_GENERAL_ERR; + send_handler(query->port->agent, &mad_send_wc); + } + } else { + spin_unlock_irqrestore(&ib_nl_request_lock, flags); + ib_nl_process_good_resolve_rsp(query, nlh); + } + +resp_out: + return skb->len; +} + +static struct ibnl_client_cbs ib_sa_cb_table[] = { + [RDMA_NL_LS_OP_RESOLVE] = { + .dump = ib_nl_handle_resolve_resp, + .module = THIS_MODULE }, + [RDMA_NL_LS_OP_SET_TIMEOUT] = { + .dump = ib_nl_handle_set_timeout, + .module = THIS_MODULE }, +}; + static void free_sm_ah(struct kref *kref) { struct ib_sa_sm_ah *sm_ah = container_of(kref, struct ib_sa_sm_ah, ref); @@ -502,7 +960,13 @@ void ib_sa_cancel_query(int id, struct ib_sa_query *query) mad_buf = query->mad_buf; spin_unlock_irqrestore(&idr_lock, flags); - ib_cancel_mad(agent, mad_buf); + /* + * If the query is still on the netlink request list, schedule + * it to be cancelled by the timeout routine. Otherwise, it has been + * sent to the MAD layer and has to be cancelled from there. + */ + if (!ib_nl_cancel_request(query)) + ib_cancel_mad(agent, mad_buf); } EXPORT_SYMBOL(ib_sa_cancel_query); @@ -639,6 +1103,14 @@ static int send_mad(struct ib_sa_query *query, int timeout_ms, gfp_t gfp_mask) query->mad_buf->context[0] = query; query->id = id; + if (query->flags & IB_SA_ENABLE_LOCAL_SERVICE) { + if (!ibnl_chk_listeners(RDMA_NL_GROUP_LS)) { + if (!ib_nl_make_request(query)) + return id; + } + ib_sa_disable_local_svc(query); + } + ret = ib_post_send_mad(query->mad_buf, NULL); if (ret) { spin_lock_irqsave(&idr_lock, flags); @@ -767,6 +1239,9 @@ int ib_sa_path_rec_get(struct ib_sa_client *client, *sa_query = &query->sa_query; + query->sa_query.flags |= IB_SA_ENABLE_LOCAL_SERVICE; + query->sa_query.mad_buf->context[1] = rec; + ret = send_mad(&query->sa_query, timeout_ms, gfp_mask); if (ret < 0) goto err2; @@ -1251,6 +1726,8 @@ static int __init ib_sa_init(void) get_random_bytes(&tid, sizeof tid); + atomic_set(&ib_nl_sa_request_seq, 0); + ret = ib_register_client(&sa_client); if (ret) { printk(KERN_ERR "Couldn't register ib_sa client\n"); @@ -1263,7 +1740,25 @@ static int __init ib_sa_init(void) goto err2; } + ib_nl_wq = create_singlethread_workqueue("ib_nl_sa_wq"); + if (!ib_nl_wq) { + ret = -ENOMEM; + goto err3; + } + + if (ibnl_add_client(RDMA_NL_LS, RDMA_NL_LS_NUM_OPS, + ib_sa_cb_table)) { + pr_err("Failed to add netlink callback\n"); + ret = -EINVAL; + goto err4; + } + INIT_DELAYED_WORK(&ib_nl_timed_work, ib_nl_request_timeout); + return 0; +err4: + destroy_workqueue(ib_nl_wq); +err3: + mcast_cleanup(); err2: ib_unregister_client(&sa_client); err1: @@ -1272,6 +1767,10 @@ err1: static void __exit ib_sa_cleanup(void) { + ibnl_remove_client(RDMA_NL_LS); + cancel_delayed_work(&ib_nl_timed_work); + flush_workqueue(ib_nl_wq); + destroy_workqueue(ib_nl_wq); mcast_cleanup(); ib_unregister_client(&sa_client); idr_destroy(&query_idr); -- 2.34.1