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+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * RDMA Transport Layer
+ *
+ * Copyright (c) 2014 - 2018 ProfitBricks GmbH. All rights reserved.
+ * Copyright (c) 2018 - 2019 1&1 IONOS Cloud GmbH. All rights reserved.
+ * Copyright (c) 2019 - 2020 1&1 IONOS SE. All rights reserved.
+ */
+
+#ifndef RTRS_CLT_H
+#define RTRS_CLT_H
+
+#include <linux/device.h>
+#include "rtrs-pri.h"
+
+/**
+ * enum rtrs_clt_state - Client states.
+ */
+enum rtrs_clt_state {
+ RTRS_CLT_CONNECTING,
+ RTRS_CLT_CONNECTING_ERR,
+ RTRS_CLT_RECONNECTING,
+ RTRS_CLT_CONNECTED,
+ RTRS_CLT_CLOSING,
+ RTRS_CLT_CLOSED,
+ RTRS_CLT_DEAD,
+};
+
+enum rtrs_mp_policy {
+ MP_POLICY_RR,
+ MP_POLICY_MIN_INFLIGHT,
+};
+
+/* see Documentation/ABI/testing/sysfs-class-rtrs-client for details */
+struct rtrs_clt_stats_reconnects {
+ int successful_cnt;
+ int fail_cnt;
+};
+
+/* see Documentation/ABI/testing/sysfs-class-rtrs-client for details */
+struct rtrs_clt_stats_cpu_migr {
+ atomic_t from;
+ int to;
+};
+
+/* stats for Read and write operation.
+ * see Documentation/ABI/testing/sysfs-class-rtrs-client for details
+ */
+struct rtrs_clt_stats_rdma {
+ struct {
+ u64 cnt;
+ u64 size_total;
+ } dir[2];
+
+ u64 failover_cnt;
+};
+
+struct rtrs_clt_stats_pcpu {
+ struct rtrs_clt_stats_cpu_migr cpu_migr;
+ struct rtrs_clt_stats_rdma rdma;
+};
+
+struct rtrs_clt_stats {
+ struct rtrs_clt_stats_pcpu __percpu *pcpu_stats;
+ struct rtrs_clt_stats_reconnects reconnects;
+ atomic_t inflight;
+};
+
+struct rtrs_clt_con {
+ struct rtrs_con c;
+ struct rtrs_iu *rsp_ius;
+ u32 queue_size;
+ unsigned int cpu;
+ atomic_t io_cnt;
+ int cm_err;
+};
+
+/**
+ * rtrs_permit - permits the memory allocation for future RDMA operation.
+ * Combine with irq pinning to keep IO on same CPU.
+ */
+struct rtrs_permit {
+ enum rtrs_clt_con_type con_type;
+ unsigned int cpu_id;
+ unsigned int mem_id;
+ unsigned int mem_off;
+};
+
+/**
+ * rtrs_clt_io_req - describes one inflight IO request
+ */
+struct rtrs_clt_io_req {
+ struct list_head list;
+ struct rtrs_iu *iu;
+ struct scatterlist *sglist; /* list holding user data */
+ unsigned int sg_cnt;
+ unsigned int sg_size;
+ unsigned int data_len;
+ unsigned int usr_len;
+ void *priv;
+ bool in_use;
+ struct rtrs_clt_con *con;
+ struct rtrs_sg_desc *desc;
+ struct ib_sge *sge;
+ struct rtrs_permit *permit;
+ enum dma_data_direction dir;
+ rtrs_conf_fn *conf;
+ unsigned long start_jiffies;
+
+ struct ib_mr *mr;
+ struct ib_cqe inv_cqe;
+ struct completion inv_comp;
+ int inv_errno;
+ bool need_inv_comp;
+ bool need_inv;
+};
+
+struct rtrs_rbuf {
+ u64 addr;
+ u32 rkey;
+};
+
+struct rtrs_clt_sess {
+ struct rtrs_sess s;
+ struct rtrs_clt *clt;
+ wait_queue_head_t state_wq;
+ enum rtrs_clt_state state;
+ atomic_t connected_cnt;
+ struct mutex init_mutex;
+ struct rtrs_clt_io_req *reqs;
+ struct delayed_work reconnect_dwork;
+ struct work_struct close_work;
+ unsigned int reconnect_attempts;
+ bool established;
+ struct rtrs_rbuf *rbufs;
+ size_t max_io_size;
+ u32 max_hdr_size;
+ u32 chunk_size;
+ size_t queue_depth;
+ u32 max_pages_per_mr;
+ int max_send_sge;
+ u32 flags;
+ struct kobject kobj;
+ struct kobject kobj_stats;
+ struct rtrs_clt_stats stats;
+ /* cache hca_port and hca_name to display in sysfs */
+ u8 hca_port;
+ char hca_name[IB_DEVICE_NAME_MAX];
+ struct list_head __percpu
+ *mp_skip_entry;
+};
+
+struct rtrs_clt {
+ struct list_head /* __rcu */ paths_list;
+ size_t paths_num;
+ struct rtrs_clt_sess
+ __rcu * __percpu *pcpu_path;
+
+ bool opened;
+ uuid_t paths_uuid;
+ int paths_up;
+ struct mutex paths_mutex;
+ struct mutex paths_ev_mutex;
+ char sessname[NAME_MAX];
+ short port;
+ unsigned int max_reconnect_attempts;
+ unsigned int reconnect_delay_sec;
+ unsigned int max_segments;
+ void *permits;
+ unsigned long *permits_map;
+ size_t queue_depth;
+ size_t max_io_size;
+ wait_queue_head_t permits_wait;
+ size_t pdu_sz;
+ void *priv;
+ link_clt_ev_fn *link_ev;
+ struct device dev;
+ struct kobject kobj_paths;
+ enum rtrs_mp_policy mp_policy;
+};
+
+static inline struct rtrs_clt_con *to_clt_con(struct rtrs_con *c)
+{
+ return container_of(c, struct rtrs_clt_con, c);
+}
+
+static inline struct rtrs_clt_sess *to_clt_sess(struct rtrs_sess *s)
+{
+ return container_of(s, struct rtrs_clt_sess, s);
+}
+
+#define PERMIT_SIZE(clt) (sizeof(struct rtrs_permit) + (clt)->pdu_sz)
+#define GET_PERMIT(clt, idx) ((clt)->permits + PERMIT_SIZE(clt) * (idx))
+
+int rtrs_clt_reconnect_from_sysfs(struct rtrs_clt_sess *sess);
+int rtrs_clt_disconnect_from_sysfs(struct rtrs_clt_sess *sess);
+int rtrs_clt_create_path_from_sysfs(struct rtrs_clt *clt,
+ struct rtrs_addr *addr);
+int rtrs_clt_remove_path_from_sysfs(struct rtrs_clt_sess *sess,
+ const struct attribute *sysfs_self);
+
+void rtrs_clt_set_max_reconnect_attempts(struct rtrs_clt *clt, int value);
+int rtrs_clt_get_max_reconnect_attempts(const struct rtrs_clt *clt);
+
+/* rtrs-clt-stats.c */
+
+int rtrs_clt_init_stats(struct rtrs_clt_stats *stats);
+void rtrs_clt_free_stats(struct rtrs_clt_stats *stats);
+
+void rtrs_clt_decrease_inflight(struct rtrs_clt_stats *s);
+void rtrs_clt_inc_failover_cnt(struct rtrs_clt_stats *s);
+
+void rtrs_clt_update_wc_stats(struct rtrs_clt_con *con);
+void rtrs_clt_update_all_stats(struct rtrs_clt_io_req *req, int dir);
+
+int rtrs_clt_reset_rdma_lat_distr_stats(struct rtrs_clt_stats *stats,
+ bool enable);
+ssize_t rtrs_clt_stats_rdma_lat_distr_to_str(struct rtrs_clt_stats *stats,
+ char *page, size_t len);
+int rtrs_clt_reset_cpu_migr_stats(struct rtrs_clt_stats *stats, bool enable);
+int rtrs_clt_stats_migration_cnt_to_str(struct rtrs_clt_stats *stats, char *buf,
+ size_t len);
+int rtrs_clt_reset_reconnects_stat(struct rtrs_clt_stats *stats, bool enable);
+int rtrs_clt_stats_reconnects_to_str(struct rtrs_clt_stats *stats, char *buf,
+ size_t len);
+int rtrs_clt_reset_wc_comp_stats(struct rtrs_clt_stats *stats, bool enable);
+int rtrs_clt_stats_wc_completion_to_str(struct rtrs_clt_stats *stats, char *buf,
+ size_t len);
+int rtrs_clt_reset_rdma_stats(struct rtrs_clt_stats *stats, bool enable);
+ssize_t rtrs_clt_stats_rdma_to_str(struct rtrs_clt_stats *stats,
+ char *page, size_t len);
+int rtrs_clt_reset_all_stats(struct rtrs_clt_stats *stats, bool enable);
+ssize_t rtrs_clt_reset_all_help(struct rtrs_clt_stats *stats,
+ char *page, size_t len);
+
+/* rtrs-clt-sysfs.c */
+
+int rtrs_clt_create_sysfs_root_folders(struct rtrs_clt *clt);
+int rtrs_clt_create_sysfs_root_files(struct rtrs_clt *clt);
+void rtrs_clt_destroy_sysfs_root_folders(struct rtrs_clt *clt);
+void rtrs_clt_destroy_sysfs_root_files(struct rtrs_clt *clt);
+
+int rtrs_clt_create_sess_files(struct rtrs_clt_sess *sess);
+void rtrs_clt_destroy_sess_files(struct rtrs_clt_sess *sess,
+ const struct attribute *sysfs_self);
+
+#endif /* RTRS_CLT_H */