[PATCH 04/24] ibtrs: client: private header with client structs and functions

[Roman Pen <roman.penyaev@profitbricks.com>]

This header describes main structs and functions used by ibtrs-client
module, mainly for managing IBTRS sessions, creating/destroying sysfs
entries, accounting statistics on client side.

Signed-off-by: Roman Pen <roman.penyaev@profitbricks.com>
Signed-off-by: Danil Kipnis <danil.kipnis@profitbricks.com>
Cc: Jack Wang <jinpu.wang@profitbricks.com>
---
 drivers/infiniband/ulp/ibtrs/ibtrs-clt.h | 338 +++++++++++++++++++++++++++++++
 1 file changed, 338 insertions(+)

diff --git a/drivers/infiniband/ulp/ibtrs/ibtrs-clt.h b/drivers/infiniband/ulp/ibtrs/ibtrs-clt.h
new file mode 100644
index 000000000000..b57af19ac833
--- /dev/null
+++ b/drivers/infiniband/ulp/ibtrs/ibtrs-clt.h
@@ -0,0 +1,338 @@
+/*
+ * InfiniBand Transport Layer
+ *
+ * Copyright (c) 2014 - 2017 ProfitBricks GmbH. All rights reserved.
+ * Authors: Fabian Holler <mail@fholler.de>
+ *          Jack Wang <jinpu.wang@profitbricks.com>
+ *          Kleber Souza <kleber.souza@profitbricks.com>
+ *          Danil Kipnis <danil.kipnis@profitbricks.com>
+ *          Roman Penyaev <roman.penyaev@profitbricks.com>
+ *          Milind Dumbare <Milind.dumbare@gmail.com>
+ *
+ * Copyright (c) 2017 - 2018 ProfitBricks GmbH. All rights reserved.
+ * Authors: Danil Kipnis <danil.kipnis@profitbricks.com>
+ *          Roman Penyaev <roman.penyaev@profitbricks.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef IBTRS_CLT_H
+#define IBTRS_CLT_H
+
+#include "ibtrs-pri.h"
+
+/**
+ * enum ibtrs_clt_state - Client states.
+ */
+enum ibtrs_clt_state {
+	IBTRS_CLT_CONNECTING,
+	IBTRS_CLT_CONNECTING_ERR,
+	IBTRS_CLT_RECONNECTING,
+	IBTRS_CLT_CONNECTED,
+	IBTRS_CLT_CLOSING,
+	IBTRS_CLT_CLOSED,
+	IBTRS_CLT_DEAD,
+};
+
+static inline const char *ibtrs_clt_state_str(enum ibtrs_clt_state state)
+{
+	switch (state) {
+	case IBTRS_CLT_CONNECTING:
+		return "IBTRS_CLT_CONNECTING";
+	case IBTRS_CLT_CONNECTING_ERR:
+		return "IBTRS_CLT_CONNECTING_ERR";
+	case IBTRS_CLT_RECONNECTING:
+		return "IBTRS_CLT_RECONNECTING";
+	case IBTRS_CLT_CONNECTED:
+		return "IBTRS_CLT_CONNECTED";
+	case IBTRS_CLT_CLOSING:
+		return "IBTRS_CLT_CLOSING";
+	case IBTRS_CLT_CLOSED:
+		return "IBTRS_CLT_CLOSED";
+	case IBTRS_CLT_DEAD:
+		return "IBTRS_CLT_DEAD";
+	default:
+		return "UNKNOWN";
+	}
+}
+
+enum ibtrs_fast_reg {
+	IBTRS_FAST_MEM_NONE,
+	IBTRS_FAST_MEM_FR,
+	IBTRS_FAST_MEM_FMR
+};
+
+enum ibtrs_mp_policy {
+	MP_POLICY_RR,
+	MP_POLICY_MIN_INFLIGHT,
+};
+
+struct ibtrs_clt_stats_reconnects {
+	int successful_cnt;
+	int fail_cnt;
+};
+
+struct ibtrs_clt_stats_wc_comp {
+	u32 cnt;
+	u64 total_cnt;
+};
+
+struct ibtrs_clt_stats_cpu_migr {
+	atomic_t from;
+	int to;
+};
+
+struct ibtrs_clt_stats_rdma {
+	struct {
+		u64 cnt;
+		u64 size_total;
+	} dir[2];
+
+	u64 failover_cnt;
+};
+
+struct ibtrs_clt_stats_rdma_lat {
+	u64 read;
+	u64 write;
+};
+
+#define MIN_LOG_SG 2
+#define MAX_LOG_SG 5
+#define MAX_LIN_SG BIT(MIN_LOG_SG)
+#define SG_DISTR_SZ (MAX_LOG_SG - MIN_LOG_SG + MAX_LIN_SG + 2)
+
+#define MAX_LOG_LAT 16
+#define MIN_LOG_LAT 0
+#define LOG_LAT_SZ (MAX_LOG_LAT - MIN_LOG_LAT + 2)
+
+struct ibtrs_clt_stats_pcpu {
+	struct ibtrs_clt_stats_cpu_migr		cpu_migr;
+	struct ibtrs_clt_stats_rdma		rdma;
+	u64					sg_list_total;
+	u64					sg_list_distr[SG_DISTR_SZ];
+	struct ibtrs_clt_stats_rdma_lat		rdma_lat_distr[LOG_LAT_SZ];
+	struct ibtrs_clt_stats_rdma_lat		rdma_lat_max;
+	struct ibtrs_clt_stats_wc_comp		wc_comp;
+};
+
+struct ibtrs_clt_stats {
+	bool					enable_rdma_lat;
+	struct ibtrs_clt_stats_pcpu    __percpu	*pcpu_stats;
+	struct ibtrs_clt_stats_reconnects	reconnects;
+	atomic_t				inflight;
+};
+
+struct ibtrs_clt_con {
+	struct ibtrs_con	c;
+	unsigned		cpu;
+	atomic_t		io_cnt;
+	struct ibtrs_fr_pool	*fr_pool;
+	int			cm_err;
+};
+
+struct ibtrs_clt_io_req {
+	struct list_head        list;
+	struct ibtrs_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 ibtrs_clt_con	*con;
+	union {
+		struct ib_pool_fmr	**fmr_list;
+		struct ibtrs_fr_desc	**fr_list;
+	};
+	void			*map_page;
+	struct ibtrs_tag	*tag;
+	u16			nmdesc;
+	enum dma_data_direction dir;
+	ibtrs_conf_fn		*conf;
+	unsigned long		start_time;
+};
+
+struct ibtrs_clt_sess {
+	struct ibtrs_sess	s;
+	struct ibtrs_clt	*clt;
+	wait_queue_head_t	state_wq;
+	enum ibtrs_clt_state	state;
+	atomic_t		connected_cnt;
+	struct mutex		init_mutex;
+	struct ibtrs_clt_io_req	*reqs;
+	struct ib_fmr_pool	*fmr_pool;
+	struct delayed_work	reconnect_dwork;
+	struct work_struct	close_work;
+	unsigned		reconnect_attempts;
+	bool			established;
+	u64			*srv_rdma_addr;
+	u32			srv_rdma_buf_rkey;
+	u32			max_io_size;
+	u32			max_req_size;
+	u32			chunk_size;
+	u32			max_desc;
+	size_t			queue_depth;
+	enum ibtrs_fast_reg	fast_reg_mode;
+	u64			mr_page_mask;
+	u32			mr_page_size;
+	u32			mr_max_size;
+	u32			max_pages_per_mr;
+	int			max_sge;
+	struct kobject		kobj;
+	struct kobject		kobj_stats;
+	struct ibtrs_clt_stats  stats;
+	struct list_head __percpu
+				*mp_skip_entry;
+};
+
+struct ibtrs_clt {
+	struct list_head   /* __rcu */ paths_list;
+	size_t			       paths_num;
+	struct ibtrs_clt_sess
+		      __percpu * __rcu *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		max_reconnect_attempts;
+	unsigned		reconnect_delay_sec;
+	unsigned		max_segments;
+	void			*tags;
+	unsigned long		*tags_map;
+	size_t			queue_depth;
+	size_t			max_io_size;
+	wait_queue_head_t	tags_wait;
+	size_t			pdu_sz;
+	void			*priv;
+	link_clt_ev_fn		*link_ev;
+	struct kobject		kobj;
+	struct kobject		kobj_paths;
+	enum ibtrs_mp_policy	mp_policy;
+};
+
+static inline struct ibtrs_clt_con *to_clt_con(struct ibtrs_con *c)
+{
+	if (unlikely(!c))
+		return NULL;
+
+	return container_of(c, struct ibtrs_clt_con, c);
+}
+
+static inline struct ibtrs_clt_sess *to_clt_sess(struct ibtrs_sess *s)
+{
+	if (unlikely(!s))
+		return NULL;
+
+	return container_of(s, struct ibtrs_clt_sess, s);
+}
+
+/**
+ * list_next_or_null_rr - get next list element in round-robin fashion.
+ * @pos:     entry, starting cursor.
+ * @head:    head of the list to examine. This list must have at least one
+ *           element, namely @pos.
+ * @member:  name of the list_head structure within typeof(*pos).
+ *
+ * Important to understand that @pos is a list entry, which can be already
+ * removed using list_del_rcu(), so if @head has become empty NULL will be
+ * returned. Otherwise next element is returned in round-robin fashion.
+ */
+#define list_next_or_null_rcu_rr(pos, head, member) ({			\
+	typeof(pos) ________next = NULL;				\
+									\
+	if (!list_empty(head))						\
+		________next = (pos)->member.next != (head) ?		\
+			list_entry_rcu((pos)->member.next,		\
+				       typeof(*pos), member) :		\
+			list_entry_rcu((pos)->member.next->next,	\
+				       typeof(*pos), member);		\
+	________next;							\
+})
+
+/* See ibtrs-log.h */
+#define TYPES_TO_SESSNAME(obj)						\
+	LIST(CASE(obj, struct ibtrs_clt_sess *, s.sessname),		\
+	     CASE(obj, struct ibtrs_clt *, sessname))
+
+#define TAG_SIZE(clt) (sizeof(struct ibtrs_tag) + (clt)->pdu_sz)
+#define GET_TAG(clt, idx) ((clt)->tags + TAG_SIZE(clt) * idx)
+
+int ibtrs_clt_reconnect_from_sysfs(struct ibtrs_clt_sess *sess);
+int ibtrs_clt_disconnect_from_sysfs(struct ibtrs_clt_sess *sess);
+int ibtrs_clt_create_path_from_sysfs(struct ibtrs_clt *clt,
+				     struct ibtrs_addr *addr);
+int ibtrs_clt_remove_path_from_sysfs(struct ibtrs_clt_sess *sess,
+				     const struct attribute *sysfs_self);
+
+void ibtrs_clt_set_max_reconnect_attempts(struct ibtrs_clt *clt, int value);
+int ibtrs_clt_get_max_reconnect_attempts(const struct ibtrs_clt *clt);
+
+/* ibtrs-clt-stats.c */
+
+int ibtrs_clt_init_stats(struct ibtrs_clt_stats *stats);
+void ibtrs_clt_free_stats(struct ibtrs_clt_stats *stats);
+
+void ibtrs_clt_decrease_inflight(struct ibtrs_clt_stats *s);
+void ibtrs_clt_inc_failover_cnt(struct ibtrs_clt_stats *s);
+
+void ibtrs_clt_update_rdma_lat(struct ibtrs_clt_stats *s, bool read,
+			       unsigned long ms);
+void ibtrs_clt_update_wc_stats(struct ibtrs_clt_con *con);
+void ibtrs_clt_update_all_stats(struct ibtrs_clt_io_req *req, int dir);
+
+int ibtrs_clt_reset_sg_list_distr_stats(struct ibtrs_clt_stats *stats,
+					bool enable);
+int ibtrs_clt_stats_sg_list_distr_to_str(struct ibtrs_clt_stats *stats,
+					 char *buf, size_t len);
+int ibtrs_clt_reset_rdma_lat_distr_stats(struct ibtrs_clt_stats *stats,
+					 bool enable);
+ssize_t ibtrs_clt_stats_rdma_lat_distr_to_str(struct ibtrs_clt_stats *stats,
+					      char *page, size_t len);
+int ibtrs_clt_reset_cpu_migr_stats(struct ibtrs_clt_stats *stats, bool enable);
+int ibtrs_clt_stats_migration_cnt_to_str(struct ibtrs_clt_stats *stats, char *buf,
+					 size_t len);
+int ibtrs_clt_reset_reconnects_stat(struct ibtrs_clt_stats *stats, bool enable);
+int ibtrs_clt_stats_reconnects_to_str(struct ibtrs_clt_stats *stats, char *buf,
+				      size_t len);
+int ibtrs_clt_reset_wc_comp_stats(struct ibtrs_clt_stats *stats, bool enable);
+int ibtrs_clt_stats_wc_completion_to_str(struct ibtrs_clt_stats *stats, char *buf,
+					 size_t len);
+int ibtrs_clt_reset_rdma_stats(struct ibtrs_clt_stats *stats, bool enable);
+ssize_t ibtrs_clt_stats_rdma_to_str(struct ibtrs_clt_stats *stats,
+				    char *page, size_t len);
+bool ibtrs_clt_sess_is_connected(const struct ibtrs_clt_sess *sess);
+int ibtrs_clt_reset_all_stats(struct ibtrs_clt_stats *stats, bool enable);
+ssize_t ibtrs_clt_reset_all_help(struct ibtrs_clt_stats *stats,
+				 char *page, size_t len);
+
+/* ibtrs-clt-sysfs.c */
+
+int ibtrs_clt_create_sysfs_module_files(void);
+void ibtrs_clt_destroy_sysfs_module_files(void);
+
+int ibtrs_clt_create_sysfs_root_folders(struct ibtrs_clt *clt);
+int ibtrs_clt_create_sysfs_root_files(struct ibtrs_clt *clt);
+void ibtrs_clt_destroy_sysfs_root_folders(struct ibtrs_clt *clt);
+void ibtrs_clt_destroy_sysfs_root_files(struct ibtrs_clt *clt);
+
+int ibtrs_clt_create_sess_files(struct ibtrs_clt_sess *sess);
+void ibtrs_clt_destroy_sess_files(struct ibtrs_clt_sess *sess,
+				  const struct attribute *sysfs_self);
+
+#endif /* IBTRS_CLT_H */
-- 
2.13.1