2 * Copyright 2008-2010 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 32/64 entries */
56 #define VNIC_RQ_BUF_MIN_BLK_ENTRIES 32
57 #define VNIC_RQ_BUF_DFLT_BLK_ENTRIES 64
58 #define VNIC_RQ_BUF_BLK_ENTRIES(entries) \
59 ((unsigned int)((entries < VNIC_RQ_BUF_DFLT_BLK_ENTRIES) ? \
60 VNIC_RQ_BUF_MIN_BLK_ENTRIES : VNIC_RQ_BUF_DFLT_BLK_ENTRIES))
61 #define VNIC_RQ_BUF_BLK_SZ(entries) \
62 (VNIC_RQ_BUF_BLK_ENTRIES(entries) * sizeof(struct vnic_rq_buf))
63 #define VNIC_RQ_BUF_BLKS_NEEDED(entries) \
64 DIV_ROUND_UP(entries, VNIC_RQ_BUF_BLK_ENTRIES(entries))
65 #define VNIC_RQ_BUF_BLKS_MAX VNIC_RQ_BUF_BLKS_NEEDED(4096)
68 struct vnic_rq_buf *next;
71 unsigned int os_buf_index;
79 struct vnic_dev *vdev;
80 struct vnic_rq_ctrl __iomem *ctrl; /* memory-mapped */
81 struct vnic_dev_ring ring;
82 struct vnic_rq_buf *bufs[VNIC_RQ_BUF_BLKS_MAX];
83 struct vnic_rq_buf *to_use;
84 struct vnic_rq_buf *to_clean;
86 unsigned int pkts_outstanding;
89 static inline unsigned int vnic_rq_desc_avail(struct vnic_rq *rq)
91 /* how many does SW own? */
92 return rq->ring.desc_avail;
95 static inline unsigned int vnic_rq_desc_used(struct vnic_rq *rq)
97 /* how many does HW own? */
98 return rq->ring.desc_count - rq->ring.desc_avail - 1;
101 static inline void *vnic_rq_next_desc(struct vnic_rq *rq)
103 return rq->to_use->desc;
106 static inline unsigned int vnic_rq_next_index(struct vnic_rq *rq)
108 return rq->to_use->index;
111 static inline void vnic_rq_post(struct vnic_rq *rq,
112 void *os_buf, unsigned int os_buf_index,
113 dma_addr_t dma_addr, unsigned int len)
115 struct vnic_rq_buf *buf = rq->to_use;
117 buf->os_buf = os_buf;
118 buf->os_buf_index = os_buf_index;
119 buf->dma_addr = dma_addr;
124 rq->ring.desc_avail--;
126 /* Move the posted_index every nth descriptor
129 #ifndef VNIC_RQ_RETURN_RATE
130 #define VNIC_RQ_RETURN_RATE 0xf /* keep 2^n - 1 */
133 if ((buf->index & VNIC_RQ_RETURN_RATE) == 0) {
134 /* Adding write memory barrier prevents compiler and/or CPU
135 * reordering, thus avoiding descriptor posting before
136 * descriptor is initialized. Otherwise, hardware can read
137 * stale descriptor fields.
140 iowrite32(buf->index, &rq->ctrl->posted_index);
144 static inline void vnic_rq_return_descs(struct vnic_rq *rq, unsigned int count)
146 rq->ring.desc_avail += count;
149 enum desc_return_options {
151 VNIC_RQ_DEFER_RETURN_DESC,
154 static inline void vnic_rq_service(struct vnic_rq *rq,
155 struct cq_desc *cq_desc, u16 completed_index,
156 int desc_return, void (*buf_service)(struct vnic_rq *rq,
157 struct cq_desc *cq_desc, struct vnic_rq_buf *buf,
158 int skipped, void *opaque), void *opaque)
160 struct vnic_rq_buf *buf;
166 skipped = (buf->index != completed_index);
168 (*buf_service)(rq, cq_desc, buf, skipped, opaque);
170 if (desc_return == VNIC_RQ_RETURN_DESC)
171 rq->ring.desc_avail++;
173 rq->to_clean = buf->next;
182 static inline int vnic_rq_fill(struct vnic_rq *rq,
183 int (*buf_fill)(struct vnic_rq *rq))
187 while (vnic_rq_desc_avail(rq) > 0) {
189 err = (*buf_fill)(rq);
197 void vnic_rq_free(struct vnic_rq *rq);
198 int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index,
199 unsigned int desc_count, unsigned int desc_size);
200 void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
201 unsigned int error_interrupt_enable,
202 unsigned int error_interrupt_offset);
203 unsigned int vnic_rq_error_status(struct vnic_rq *rq);
204 void vnic_rq_enable(struct vnic_rq *rq);
205 int vnic_rq_disable(struct vnic_rq *rq);
206 void vnic_rq_clean(struct vnic_rq *rq,
207 void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf));
209 #endif /* _VNIC_RQ_H_ */