mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-23 14:13:49 +07:00
0c98568c1f
The function pvrdma_idx_ring_is_valid_idx is not in used so let's remove it. Signed-off-by: Yuval Shaia <yuval.shaia@oracle.com> Acked-by: Adit Ranadive <aditr@vmware.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
115 lines
3.9 KiB
C
115 lines
3.9 KiB
C
/*
|
|
* 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 <linux/types.h>
|
|
|
|
#define PVRDMA_INVALID_IDX -1 /* Invalid index. */
|
|
|
|
struct pvrdma_ring {
|
|
atomic_t prod_tail; /* Producer tail. */
|
|
atomic_t 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(__u32 idx, __u32 max_elems)
|
|
{
|
|
/* Generates fewer instructions than a less-than. */
|
|
return (idx & ~((max_elems << 1) - 1)) == 0;
|
|
}
|
|
|
|
static inline __s32 pvrdma_idx(atomic_t *var, __u32 max_elems)
|
|
{
|
|
const unsigned int idx = atomic_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(atomic_t *var, __u32 max_elems)
|
|
{
|
|
__u32 idx = atomic_read(var) + 1; /* Increment. */
|
|
|
|
idx &= (max_elems << 1) - 1; /* Modulo size, flip gen. */
|
|
atomic_set(var, idx);
|
|
}
|
|
|
|
static inline __s32 pvrdma_idx_ring_has_space(const struct pvrdma_ring *r,
|
|
__u32 max_elems, __u32 *out_tail)
|
|
{
|
|
const __u32 tail = atomic_read(&r->prod_tail);
|
|
const __u32 head = atomic_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 __s32 pvrdma_idx_ring_has_data(const struct pvrdma_ring *r,
|
|
__u32 max_elems, __u32 *out_head)
|
|
{
|
|
const __u32 tail = atomic_read(&r->prod_tail);
|
|
const __u32 head = atomic_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__ */
|