IB/rdmavt: Break rdma_vt main include header file up

[linux-2.6-block.git] / include / rdma / rdmavt_mr.h

diff --git a/include/rdma/rdmavt_mr.h b/include/rdma/rdmavt_mr.h
new file mode 100644 (file)
index 0000000..ea60476
--- /dev/null
+++ b/include/rdma/rdmavt_mr.h
@@ -0,0 +1,130 @@
+#ifndef DEF_RDMAVT_INCMR_H
+#define DEF_RDMAVT_INCMR_H
+
+/*
+ * Copyright(c) 2015 Intel Corporation.
+ *
+ * This file is provided under a dual BSD/GPLv2 license.  When using or
+ * redistributing this file, you may do so under either license.
+ *
+ * GPL LICENSE SUMMARY
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * 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.
+ *
+ * BSD LICENSE
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ *  - Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  - Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *  - Neither the name of Intel Corporation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+/*
+ * For Memory Regions. This stuff should probably be moved into rdmavt/mr.h once
+ * drivers no longer need access to the MR directly.
+ */
+
+/*
+ * A segment is a linear region of low physical memory.
+ * Used by the verbs layer.
+ */
+struct rvt_seg {
+       void *vaddr;
+       size_t length;
+};
+
+/* The number of rvt_segs that fit in a page. */
+#define RVT_SEGSZ     (PAGE_SIZE / sizeof(struct rvt_seg))
+
+struct rvt_segarray {
+       struct rvt_seg segs[RVT_SEGSZ];
+};
+
+struct rvt_mregion {
+       struct ib_pd *pd;       /* shares refcnt of ibmr.pd */
+       u64 user_base;          /* User's address for this region */
+       u64 iova;               /* IB start address of this region */
+       size_t length;
+       u32 lkey;
+       u32 offset;             /* offset (bytes) to start of region */
+       int access_flags;
+       u32 max_segs;           /* number of rvt_segs in all the arrays */
+       u32 mapsz;              /* size of the map array */
+       u8  page_shift;         /* 0 - non unform/non powerof2 sizes */
+       u8  lkey_published;     /* in global table */
+       struct completion comp; /* complete when refcount goes to zero */
+       atomic_t refcount;
+       struct rvt_segarray *map[0];    /* the segments */
+};
+
+#define RVT_MAX_LKEY_TABLE_BITS 23
+
+struct rvt_lkey_table {
+       spinlock_t lock; /* protect changes in this struct */
+       u32 next;               /* next unused index (speeds search) */
+       u32 gen;                /* generation count */
+       u32 max;                /* size of the table */
+       struct rvt_mregion __rcu **table;
+};
+
+/*
+ * These keep track of the copy progress within a memory region.
+ * Used by the verbs layer.
+ */
+struct rvt_sge {
+       struct rvt_mregion *mr;
+       void *vaddr;            /* kernel virtual address of segment */
+       u32 sge_length;         /* length of the SGE */
+       u32 length;             /* remaining length of the segment */
+       u16 m;                  /* current index: mr->map[m] */
+       u16 n;                  /* current index: mr->map[m]->segs[n] */
+};
+
+struct rvt_sge_state {
+       struct rvt_sge *sg_list;      /* next SGE to be used if any */
+       struct rvt_sge sge;   /* progress state for the current SGE */
+       u32 total_len;
+       u8 num_sge;
+};
+
+static inline void rvt_put_mr(struct rvt_mregion *mr)
+{
+       if (unlikely(atomic_dec_and_test(&mr->refcount)))
+               complete(&mr->comp);
+}
+
+static inline void rvt_get_mr(struct rvt_mregion *mr)
+{
+       atomic_inc(&mr->refcount);
+}
+
+#endif          /* DEF_RDMAVT_INCMRH */