diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/standard-headers/drivers/infiniband/hw/vmw_pvrdma/pvrdma_ring.h | 114 |
1 files changed, 0 insertions, 114 deletions
diff --git a/include/standard-headers/drivers/infiniband/hw/vmw_pvrdma/pvrdma_ring.h b/include/standard-headers/drivers/infiniband/hw/vmw_pvrdma/pvrdma_ring.h deleted file mode 100644 index 7b4062a..0000000 --- a/include/standard-headers/drivers/infiniband/hw/vmw_pvrdma/pvrdma_ring.h +++ /dev/null @@ -1,114 +0,0 @@ -/* - * Copyright (c) 2012-2016 VMware, Inc. All rights reserved. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of EITHER the GNU General Public License - * version 2 as published by the Free Software Foundation or the BSD - * 2-Clause License. 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 version 2 for more details at - * http://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html. - * - * You should have received a copy of the GNU General Public License - * along with this program available in the file COPYING in the main - * directory of this source tree. - * - * The BSD 2-Clause 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. - * - * 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 HOLDER 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. - */ - -#ifndef __PVRDMA_RING_H__ -#define __PVRDMA_RING_H__ - -#include "standard-headers/linux/types.h" - -#define PVRDMA_INVALID_IDX -1 /* Invalid index. */ - -struct pvrdma_ring { - int prod_tail; /* Producer tail. */ - int cons_head; /* Consumer head. */ -}; - -struct pvrdma_ring_state { - struct pvrdma_ring tx; /* Tx ring. */ - struct pvrdma_ring rx; /* Rx ring. */ -}; - -static inline int pvrdma_idx_valid(uint32_t idx, uint32_t max_elems) -{ - /* Generates fewer instructions than a less-than. */ - return (idx & ~((max_elems << 1) - 1)) == 0; -} - -static inline int32_t pvrdma_idx(int *var, uint32_t max_elems) -{ - const unsigned int idx = qatomic_read(var); - - if (pvrdma_idx_valid(idx, max_elems)) - return idx & (max_elems - 1); - return PVRDMA_INVALID_IDX; -} - -static inline void pvrdma_idx_ring_inc(int *var, uint32_t max_elems) -{ - uint32_t idx = qatomic_read(var) + 1; /* Increment. */ - - idx &= (max_elems << 1) - 1; /* Modulo size, flip gen. */ - qatomic_set(var, idx); -} - -static inline int32_t pvrdma_idx_ring_has_space(const struct pvrdma_ring *r, - uint32_t max_elems, uint32_t *out_tail) -{ - const uint32_t tail = qatomic_read(&r->prod_tail); - const uint32_t head = qatomic_read(&r->cons_head); - - if (pvrdma_idx_valid(tail, max_elems) && - pvrdma_idx_valid(head, max_elems)) { - *out_tail = tail & (max_elems - 1); - return tail != (head ^ max_elems); - } - return PVRDMA_INVALID_IDX; -} - -static inline int32_t pvrdma_idx_ring_has_data(const struct pvrdma_ring *r, - uint32_t max_elems, uint32_t *out_head) -{ - const uint32_t tail = qatomic_read(&r->prod_tail); - const uint32_t head = qatomic_read(&r->cons_head); - - if (pvrdma_idx_valid(tail, max_elems) && - pvrdma_idx_valid(head, max_elems)) { - *out_head = head & (max_elems - 1); - return tail != head; - } - return PVRDMA_INVALID_IDX; -} - -#endif /* __PVRDMA_RING_H__ */ |