2 * Copyright 2008 Cisco Systems, Inc. All rights reserved.
3 * Copyright 2007 Nuova Systems, Inc. All rights reserved.
5 * This program is free software; you may redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; version 2 of the License.
9 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
10 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
11 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
12 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
13 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
14 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
15 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 #include <linux/pci.h>
28 /* Receive queue control */
30 u64 ring_base; /* 0x00 */
31 u32 ring_size; /* 0x08 */
33 u32 posted_index; /* 0x10 */
35 u32 cq_index; /* 0x18 */
37 u32 enable; /* 0x20 */
39 u32 running; /* 0x28 */
41 u32 fetch_index; /* 0x30 */
43 u32 error_interrupt_enable; /* 0x38 */
45 u32 error_interrupt_offset; /* 0x40 */
47 u32 error_status; /* 0x48 */
49 u32 dropped_packet_count; /* 0x50 */
51 u32 dropped_packet_count_rc; /* 0x58 */
55 /* Break the vnic_rq_buf allocations into blocks of 64 entries */
56 #define VNIC_RQ_BUF_BLK_ENTRIES 64
57 #define VNIC_RQ_BUF_BLK_SZ \
58 (VNIC_RQ_BUF_BLK_ENTRIES * sizeof(struct vnic_rq_buf))
59 #define VNIC_RQ_BUF_BLKS_NEEDED(entries) \
60 DIV_ROUND_UP(entries, VNIC_RQ_BUF_BLK_ENTRIES)
61 #define VNIC_RQ_BUF_BLKS_MAX VNIC_RQ_BUF_BLKS_NEEDED(4096)
64 struct vnic_rq_buf *next;
67 unsigned int os_buf_index;
75 struct vnic_dev *vdev;
76 struct vnic_rq_ctrl __iomem *ctrl; /* memory-mapped */
77 struct vnic_dev_ring ring;
78 struct vnic_rq_buf *bufs[VNIC_RQ_BUF_BLKS_MAX];
79 struct vnic_rq_buf *to_use;
80 struct vnic_rq_buf *to_clean;
82 unsigned int buf_index;
83 unsigned int pkts_outstanding;
86 static inline unsigned int vnic_rq_desc_avail(struct vnic_rq *rq)
88 /* how many does SW own? */
89 return rq->ring.desc_avail;
92 static inline unsigned int vnic_rq_desc_used(struct vnic_rq *rq)
94 /* how many does HW own? */
95 return rq->ring.desc_count - rq->ring.desc_avail - 1;
98 static inline void *vnic_rq_next_desc(struct vnic_rq *rq)
100 return rq->to_use->desc;
103 static inline unsigned int vnic_rq_next_index(struct vnic_rq *rq)
105 return rq->to_use->index;
108 static inline unsigned int vnic_rq_next_buf_index(struct vnic_rq *rq)
110 return rq->buf_index++;
113 static inline void vnic_rq_post(struct vnic_rq *rq,
114 void *os_buf, unsigned int os_buf_index,
115 dma_addr_t dma_addr, unsigned int len)
117 struct vnic_rq_buf *buf = rq->to_use;
119 buf->os_buf = os_buf;
120 buf->os_buf_index = os_buf_index;
121 buf->dma_addr = dma_addr;
126 rq->ring.desc_avail--;
128 /* Move the posted_index every nth descriptor
131 #ifndef VNIC_RQ_RETURN_RATE
132 #define VNIC_RQ_RETURN_RATE 0xf /* keep 2^n - 1 */
135 if ((buf->index & VNIC_RQ_RETURN_RATE) == 0)
136 iowrite32(buf->index, &rq->ctrl->posted_index);
139 static inline void vnic_rq_return_descs(struct vnic_rq *rq, unsigned int count)
141 rq->ring.desc_avail += count;
144 enum desc_return_options {
146 VNIC_RQ_DEFER_RETURN_DESC,
149 static inline void vnic_rq_service(struct vnic_rq *rq,
150 struct cq_desc *cq_desc, u16 completed_index,
151 int desc_return, void (*buf_service)(struct vnic_rq *rq,
152 struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
153 int skipped, void *opaque), void *opaque)
155 struct vnic_rq_buf *buf;
161 skipped = (buf->index != completed_index);
163 (*buf_service)(rq, cq_desc, buf, skipped, opaque);
165 if (desc_return == VNIC_RQ_RETURN_DESC)
166 rq->ring.desc_avail++;
168 rq->to_clean = buf->next;
177 static inline int vnic_rq_fill(struct vnic_rq *rq,
178 int (*buf_fill)(struct vnic_rq *rq))
182 while (vnic_rq_desc_avail(rq) > 1) {
184 err = (*buf_fill)(rq);
192 void vnic_rq_free(struct vnic_rq *rq);
193 int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,
194 unsigned int desc_count, unsigned int desc_size);
195 void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
196 unsigned int error_interrupt_enable,
197 unsigned int error_interrupt_offset);
198 unsigned int vnic_rq_error_status(struct vnic_rq *rq);
199 void vnic_rq_enable(struct vnic_rq *rq);
200 int vnic_rq_disable(struct vnic_rq *rq);
201 void vnic_rq_clean(struct vnic_rq *rq,
202 void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf));
204 #endif /* _VNIC_RQ_H_ */