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.peny...@profitbricks.com>
Signed-off-by: Danil Kipnis <danil.kip...@profitbricks.com>
Cc: Jack Wang <jinpu.w...@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 <m...@fholler.de>
+ *          Jack Wang <jinpu.w...@profitbricks.com>
+ *          Kleber Souza <kleber.so...@profitbricks.com>
+ *          Danil Kipnis <danil.kip...@profitbricks.com>
+ *          Roman Penyaev <roman.peny...@profitbricks.com>
+ *          Milind Dumbare <milind.dumb...@gmail.com>
+ *
+ * Copyright (c) 2017 - 2018 ProfitBricks GmbH. All rights reserved.
+ * Authors: Danil Kipnis <danil.kip...@profitbricks.com>
+ *          Roman Penyaev <roman.peny...@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

Reply via email to