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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright 2008-2017 Cisco Systems, Inc. All rights reserved.
* Copyright 2007 Nuova Systems, Inc. All rights reserved.
*/
#ifndef _VNIC_WQ_H_
#define _VNIC_WQ_H_
#include "vnic_dev.h"
#include "vnic_cq.h"
#include <rte_memzone.h>
/* Work queue control */
struct vnic_wq_ctrl {
u64 ring_base; /* 0x00 */
u32 ring_size; /* 0x08 */
u32 pad0;
u32 posted_index; /* 0x10 */
u32 pad1;
u32 cq_index; /* 0x18 */
u32 pad2;
u32 enable; /* 0x20 */
u32 pad3;
u32 running; /* 0x28 */
u32 pad4;
u32 fetch_index; /* 0x30 */
u32 pad5;
u32 dca_value; /* 0x38 */
u32 pad6;
u32 error_interrupt_enable; /* 0x40 */
u32 pad7;
u32 error_interrupt_offset; /* 0x48 */
u32 pad8;
u32 error_status; /* 0x50 */
u32 pad9;
};
/* 16 bytes */
struct vnic_wq_buf {
struct rte_mempool *pool;
void *mb;
};
struct vnic_wq {
unsigned int index;
struct vnic_dev *vdev;
struct vnic_wq_ctrl __iomem *ctrl; /* memory-mapped */
struct vnic_dev_ring ring;
struct vnic_wq_buf *bufs;
unsigned int head_idx;
unsigned int tail_idx;
unsigned int socket_id;
const struct rte_memzone *cqmsg_rz;
uint16_t last_completed_index;
};
static inline unsigned int vnic_wq_desc_avail(struct vnic_wq *wq)
{
/* how many does SW own? */
return wq->ring.desc_avail;
}
static inline unsigned int vnic_wq_desc_used(struct vnic_wq *wq)
{
/* how many does HW own? */
return wq->ring.desc_count - wq->ring.desc_avail - 1;
}
#define PI_LOG2_CACHE_LINE_SIZE 5
#define PI_INDEX_BITS 12
#define PI_INDEX_MASK ((1U << PI_INDEX_BITS) - 1)
#define PI_PREFETCH_LEN_MASK ((1U << PI_LOG2_CACHE_LINE_SIZE) - 1)
#define PI_PREFETCH_LEN_OFF 16
#define PI_PREFETCH_ADDR_BITS 43
#define PI_PREFETCH_ADDR_MASK ((1ULL << PI_PREFETCH_ADDR_BITS) - 1)
#define PI_PREFETCH_ADDR_OFF 21
/** How many cache lines are touched by buffer (addr, len). */
static inline unsigned int num_cache_lines_touched(dma_addr_t addr,
unsigned int len)
{
const unsigned long mask = PI_PREFETCH_LEN_MASK;
const unsigned long laddr = (unsigned long)addr;
unsigned long lines, equiv_len;
/* A. If addr is aligned, our solution is just to round up len to the
next boundary.
e.g. addr = 0, len = 48
+--------------------+
|XXXXXXXXXXXXXXXXXXXX| 32-byte cacheline a
+--------------------+
|XXXXXXXXXX | cacheline b
+--------------------+
B. If addr is not aligned, however, we may use an extra
cacheline. e.g. addr = 12, len = 22
+--------------------+
| XXXXXXXXXXXXX|
+--------------------+
|XX |
+--------------------+
Our solution is to make the problem equivalent to case A
above by adding the empty space in the first cacheline to the length:
unsigned long len;
+--------------------+
|eeeeeeeXXXXXXXXXXXXX| "e" is empty space, which we add to len
+--------------------+
|XX |
+--------------------+
*/
equiv_len = len + (laddr & mask);
/* Now we can just round up this len to the next 32-byte boundary. */
lines = (equiv_len + mask) & (~mask);
/* Scale bytes -> cachelines. */
return lines >> PI_LOG2_CACHE_LINE_SIZE;
}
static inline u64 vnic_cached_posted_index(dma_addr_t addr, unsigned int len,
unsigned int index)
{
unsigned int num_cache_lines = num_cache_lines_touched(addr, len);
/* Wish we could avoid a branch here. We could have separate
* vnic_wq_post() and vinc_wq_post_inline(), the latter
* only supporting < 1k (2^5 * 2^5) sends, I suppose. This would
* eliminate the if (eop) branch as well.
*/
if (num_cache_lines > PI_PREFETCH_LEN_MASK)
num_cache_lines = 0;
return (index & PI_INDEX_MASK) |
((num_cache_lines & PI_PREFETCH_LEN_MASK) << PI_PREFETCH_LEN_OFF) |
(((addr >> PI_LOG2_CACHE_LINE_SIZE) &
PI_PREFETCH_ADDR_MASK) << PI_PREFETCH_ADDR_OFF);
}
static inline uint32_t
buf_idx_incr(uint32_t n_descriptors, uint32_t idx)
{
idx++;
if (unlikely(idx == n_descriptors))
idx = 0;
return idx;
}
void vnic_wq_free(struct vnic_wq *wq);
int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
unsigned int desc_count, unsigned int desc_size);
void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
unsigned int fetch_index, unsigned int posted_index,
unsigned int error_interrupt_enable,
unsigned int error_interrupt_offset);
void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
unsigned int error_interrupt_enable,
unsigned int error_interrupt_offset);
void vnic_wq_error_out(struct vnic_wq *wq, unsigned int error);
unsigned int vnic_wq_error_status(struct vnic_wq *wq);
void vnic_wq_enable(struct vnic_wq *wq);
int vnic_wq_disable(struct vnic_wq *wq);
void vnic_wq_clean(struct vnic_wq *wq,
void (*buf_clean)(struct vnic_wq_buf *buf));
#endif /* _VNIC_WQ_H_ */
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