RDMA/rtrs: server: private header with server structs and functions

This header describes main structs and functions used by rtrs-server
module, mainly for accepting rtrs sessions, creating/destroying sysfs
entries, accounting statistics on server side.

Link: https://lore.kernel.org/r/20200511135131.27580-10-danil.kipnis@cloud.ionos.com
Signed-off-by: Danil Kipnis <danil.kipnis@cloud.ionos.com>
Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/ulp/rtrs/rtrs-srv.h b/drivers/infiniband/ulp/rtrs/rtrs-srv.h
new file mode 100644 (file)
index 0000000..dc95b09
--- /dev/null
+++ b/drivers/infiniband/ulp/rtrs/rtrs-srv.h
@@ -0,0 +1,148 @@
+/* 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_SRV_H
+#define RTRS_SRV_H
+
+#include <linux/device.h>
+#include <linux/refcount.h>
+#include "rtrs-pri.h"
+
+/*
+ * enum rtrs_srv_state - Server states.
+ */
+enum rtrs_srv_state {
+       RTRS_SRV_CONNECTING,
+       RTRS_SRV_CONNECTED,
+       RTRS_SRV_CLOSING,
+       RTRS_SRV_CLOSED,
+};
+
+/* stats for Read and write operation.
+ * see Documentation/ABI/testing/sysfs-class-rtrs-server for details
+ */
+struct rtrs_srv_stats_rdma_stats {
+       struct {
+               atomic64_t      cnt;
+               atomic64_t      size_total;
+       } dir[2];
+};
+
+struct rtrs_srv_stats {
+       struct kobject                          kobj_stats;
+       struct rtrs_srv_stats_rdma_stats        rdma_stats;
+       struct rtrs_srv_sess                    *sess;
+};
+
+struct rtrs_srv_con {
+       struct rtrs_con         c;
+       atomic_t                wr_cnt;
+       atomic_t                sq_wr_avail;
+       struct list_head        rsp_wr_wait_list;
+       spinlock_t              rsp_wr_wait_lock;
+};
+
+/* IO context in rtrs_srv, each io has one */
+struct rtrs_srv_op {
+       struct rtrs_srv_con             *con;
+       u32                             msg_id;
+       u8                              dir;
+       struct rtrs_msg_rdma_read       *rd_msg;
+       struct ib_rdma_wr               tx_wr;
+       struct ib_sge                   tx_sg;
+       struct list_head                wait_list;
+       int                             status;
+};
+
+/*
+ * server side memory region context, when always_invalidate=Y, we need
+ * queue_depth of memory regrion to invalidate each memory region.
+ */
+struct rtrs_srv_mr {
+       struct ib_mr    *mr;
+       struct sg_table sgt;
+       struct ib_cqe   inv_cqe;        /* only for always_invalidate=true */
+       u32             msg_id;         /* only for always_invalidate=true */
+       u32             msg_off;        /* only for always_invalidate=true */
+       struct rtrs_iu  *iu;            /* send buffer for new rkey msg */
+};
+
+struct rtrs_srv_sess {
+       struct rtrs_sess        s;
+       struct rtrs_srv *srv;
+       struct work_struct      close_work;
+       enum rtrs_srv_state     state;
+       spinlock_t              state_lock;
+       int                     cur_cq_vector;
+       struct rtrs_srv_op      **ops_ids;
+       atomic_t                ids_inflight;
+       wait_queue_head_t       ids_waitq;
+       struct rtrs_srv_mr      *mrs;
+       unsigned int            mrs_num;
+       dma_addr_t              *dma_addr;
+       bool                    established;
+       unsigned int            mem_bits;
+       struct kobject          kobj;
+       struct rtrs_srv_stats   *stats;
+};
+
+struct rtrs_srv {
+       struct list_head        paths_list;
+       int                     paths_up;
+       struct mutex            paths_ev_mutex;
+       size_t                  paths_num;
+       struct mutex            paths_mutex;
+       uuid_t                  paths_uuid;
+       refcount_t              refcount;
+       struct rtrs_srv_ctx     *ctx;
+       struct list_head        ctx_list;
+       void                    *priv;
+       size_t                  queue_depth;
+       struct page             **chunks;
+       struct device           dev;
+       unsigned int            dev_ref;
+       struct kobject          *kobj_paths;
+};
+
+struct rtrs_srv_ctx {
+       struct rtrs_srv_ops ops;
+       struct rdma_cm_id *cm_id_ip;
+       struct rdma_cm_id *cm_id_ib;
+       struct mutex srv_mutex;
+       struct list_head srv_list;
+};
+
+extern struct class *rtrs_dev_class;
+
+void close_sess(struct rtrs_srv_sess *sess);
+
+static inline void rtrs_srv_update_rdma_stats(struct rtrs_srv_stats *s,
+                                             size_t size, int d)
+{
+       atomic64_inc(&s->rdma_stats.dir[d].cnt);
+       atomic64_add(size, &s->rdma_stats.dir[d].size_total);
+}
+
+/* functions which are implemented in rtrs-srv-stats.c */
+int rtrs_srv_reset_rdma_stats(struct rtrs_srv_stats *stats, bool enable);
+ssize_t rtrs_srv_stats_rdma_to_str(struct rtrs_srv_stats *stats,
+                                   char *page, size_t len);
+int rtrs_srv_reset_wc_completion_stats(struct rtrs_srv_stats *stats,
+                                       bool enable);
+int rtrs_srv_stats_wc_completion_to_str(struct rtrs_srv_stats *stats, char *buf,
+                                        size_t len);
+int rtrs_srv_reset_all_stats(struct rtrs_srv_stats *stats, bool enable);
+ssize_t rtrs_srv_reset_all_help(struct rtrs_srv_stats *stats,
+                                char *page, size_t len);
+
+/* functions which are implemented in rtrs-srv-sysfs.c */
+int rtrs_srv_create_sess_files(struct rtrs_srv_sess *sess);
+void rtrs_srv_destroy_sess_files(struct rtrs_srv_sess *sess);
+
+#endif /* RTRS_SRV_H */