mirror of
https://github.com/torvalds/linux.git
synced 2024-11-18 10:01:43 +00:00
5df6d737dd
fnic is a driver for the Cisco PCI-Express FCoE HBA Signed-off-by: Abhijeet Joglekar <abjoglek@cisco.com> Signed-off-by: Joe Eykholt <jeykholt@cisco.com> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
129 lines
3.7 KiB
C
129 lines
3.7 KiB
C
/*
|
|
* Copyright 2008 Cisco Systems, Inc. All rights reserved.
|
|
* Copyright 2007 Nuova Systems, Inc. All rights reserved.
|
|
*
|
|
* This program is free software; you may redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; version 2 of the License.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*/
|
|
#ifndef _VNIC_WQ_COPY_H_
|
|
#define _VNIC_WQ_COPY_H_
|
|
|
|
#include <linux/pci.h>
|
|
#include "vnic_wq.h"
|
|
#include "fcpio.h"
|
|
|
|
#define VNIC_WQ_COPY_MAX 1
|
|
|
|
struct vnic_wq_copy {
|
|
unsigned int index;
|
|
struct vnic_dev *vdev;
|
|
struct vnic_wq_ctrl __iomem *ctrl; /* memory-mapped */
|
|
struct vnic_dev_ring ring;
|
|
unsigned to_use_index;
|
|
unsigned to_clean_index;
|
|
};
|
|
|
|
static inline unsigned int vnic_wq_copy_desc_avail(struct vnic_wq_copy *wq)
|
|
{
|
|
return wq->ring.desc_avail;
|
|
}
|
|
|
|
static inline unsigned int vnic_wq_copy_desc_in_use(struct vnic_wq_copy *wq)
|
|
{
|
|
return wq->ring.desc_count - 1 - wq->ring.desc_avail;
|
|
}
|
|
|
|
static inline void *vnic_wq_copy_next_desc(struct vnic_wq_copy *wq)
|
|
{
|
|
struct fcpio_host_req *desc = wq->ring.descs;
|
|
return &desc[wq->to_use_index];
|
|
}
|
|
|
|
static inline void vnic_wq_copy_post(struct vnic_wq_copy *wq)
|
|
{
|
|
|
|
((wq->to_use_index + 1) == wq->ring.desc_count) ?
|
|
(wq->to_use_index = 0) : (wq->to_use_index++);
|
|
wq->ring.desc_avail--;
|
|
|
|
/* Adding write memory barrier prevents compiler and/or CPU
|
|
* reordering, thus avoiding descriptor posting before
|
|
* descriptor is initialized. Otherwise, hardware can read
|
|
* stale descriptor fields.
|
|
*/
|
|
wmb();
|
|
|
|
iowrite32(wq->to_use_index, &wq->ctrl->posted_index);
|
|
}
|
|
|
|
static inline void vnic_wq_copy_desc_process(struct vnic_wq_copy *wq, u16 index)
|
|
{
|
|
unsigned int cnt;
|
|
|
|
if (wq->to_clean_index <= index)
|
|
cnt = (index - wq->to_clean_index) + 1;
|
|
else
|
|
cnt = wq->ring.desc_count - wq->to_clean_index + index + 1;
|
|
|
|
wq->to_clean_index = ((index + 1) % wq->ring.desc_count);
|
|
wq->ring.desc_avail += cnt;
|
|
|
|
}
|
|
|
|
static inline void vnic_wq_copy_service(struct vnic_wq_copy *wq,
|
|
u16 completed_index,
|
|
void (*q_service)(struct vnic_wq_copy *wq,
|
|
struct fcpio_host_req *wq_desc))
|
|
{
|
|
struct fcpio_host_req *wq_desc = wq->ring.descs;
|
|
unsigned int curr_index;
|
|
|
|
while (1) {
|
|
|
|
if (q_service)
|
|
(*q_service)(wq, &wq_desc[wq->to_clean_index]);
|
|
|
|
wq->ring.desc_avail++;
|
|
|
|
curr_index = wq->to_clean_index;
|
|
|
|
/* increment the to-clean index so that we start
|
|
* with an unprocessed index next time we enter the loop
|
|
*/
|
|
((wq->to_clean_index + 1) == wq->ring.desc_count) ?
|
|
(wq->to_clean_index = 0) : (wq->to_clean_index++);
|
|
|
|
if (curr_index == completed_index)
|
|
break;
|
|
|
|
/* we have cleaned all the entries */
|
|
if ((completed_index == (u16)-1) &&
|
|
(wq->to_clean_index == wq->to_use_index))
|
|
break;
|
|
}
|
|
}
|
|
|
|
void vnic_wq_copy_enable(struct vnic_wq_copy *wq);
|
|
int vnic_wq_copy_disable(struct vnic_wq_copy *wq);
|
|
void vnic_wq_copy_free(struct vnic_wq_copy *wq);
|
|
int vnic_wq_copy_alloc(struct vnic_dev *vdev, struct vnic_wq_copy *wq,
|
|
unsigned int index, unsigned int desc_count, unsigned int desc_size);
|
|
void vnic_wq_copy_init(struct vnic_wq_copy *wq, unsigned int cq_index,
|
|
unsigned int error_interrupt_enable,
|
|
unsigned int error_interrupt_offset);
|
|
void vnic_wq_copy_clean(struct vnic_wq_copy *wq,
|
|
void (*q_clean)(struct vnic_wq_copy *wq,
|
|
struct fcpio_host_req *wq_desc));
|
|
|
|
#endif /* _VNIC_WQ_COPY_H_ */
|