1 /*
2 * Copyright 2008-2010 Cisco Systems, Inc. All rights reserved.
3 * Copyright 2007 Nuova Systems, Inc. All rights reserved.
4 *
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.
8 *
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
16 * SOFTWARE.
17 *
18 */
19
20 #ifndef _VNIC_WQ_H_
21 #define _VNIC_WQ_H_
22
23 #include <linux/pci.h>
24
25 #include "vnic_dev.h"
26 #include "vnic_cq.h"
27
28 /* Work queue control */
29 struct vnic_wq_ctrl {
30 u64 ring_base; /* 0x00 */
31 u32 ring_size; /* 0x08 */
32 u32 pad0;
33 u32 posted_index; /* 0x10 */
34 u32 pad1;
35 u32 cq_index; /* 0x18 */
36 u32 pad2;
37 u32 enable; /* 0x20 */
38 u32 pad3;
39 u32 running; /* 0x28 */
40 u32 pad4;
41 u32 fetch_index; /* 0x30 */
42 u32 pad5;
43 u32 dca_value; /* 0x38 */
44 u32 pad6;
45 u32 error_interrupt_enable; /* 0x40 */
46 u32 pad7;
47 u32 error_interrupt_offset; /* 0x48 */
48 u32 pad8;
49 u32 error_status; /* 0x50 */
50 u32 pad9;
51 };
52
53 struct vnic_wq_buf {
54 struct vnic_wq_buf *next;
55 dma_addr_t dma_addr;
56 void *os_buf;
57 unsigned int len;
58 unsigned int index;
59 int sop;
60 void *desc;
61 uint64_t wr_id; /* Cookie */
62 uint8_t cq_entry; /* Gets completion event from hw */
63 uint8_t desc_skip_cnt; /* Num descs to occupy */
64 uint8_t compressed_send; /* Both hdr and payload in one desc */
65 };
66
67 /* Break the vnic_wq_buf allocations into blocks of 32/64 entries */
68 #define VNIC_WQ_BUF_MIN_BLK_ENTRIES 32
69 #define VNIC_WQ_BUF_DFLT_BLK_ENTRIES 64
70 #define VNIC_WQ_BUF_BLK_ENTRIES(entries) \
71 ((unsigned int)((entries < VNIC_WQ_BUF_DFLT_BLK_ENTRIES) ? \
72 VNIC_WQ_BUF_MIN_BLK_ENTRIES : VNIC_WQ_BUF_DFLT_BLK_ENTRIES))
73 #define VNIC_WQ_BUF_BLK_SZ(entries) \
74 (VNIC_WQ_BUF_BLK_ENTRIES(entries) * sizeof(struct vnic_wq_buf))
75 #define VNIC_WQ_BUF_BLKS_NEEDED(entries) \
76 DIV_ROUND_UP(entries, VNIC_WQ_BUF_BLK_ENTRIES(entries))
77 #define VNIC_WQ_BUF_BLKS_MAX VNIC_WQ_BUF_BLKS_NEEDED(4096)
78
79 struct vnic_wq {
80 unsigned int index;
81 struct vnic_dev *vdev;
82 struct vnic_wq_ctrl __iomem *ctrl; /* memory-mapped */
83 struct vnic_dev_ring ring;
84 struct vnic_wq_buf *bufs[VNIC_WQ_BUF_BLKS_MAX];
85 struct vnic_wq_buf *to_use;
86 struct vnic_wq_buf *to_clean;
87 unsigned int pkts_outstanding;
88 };
89
vnic_wq_desc_avail(struct vnic_wq * wq)90 static inline unsigned int vnic_wq_desc_avail(struct vnic_wq *wq)
91 {
92 /* how many does SW own? */
93 return wq->ring.desc_avail;
94 }
95
vnic_wq_desc_used(struct vnic_wq * wq)96 static inline unsigned int vnic_wq_desc_used(struct vnic_wq *wq)
97 {
98 /* how many does HW own? */
99 return wq->ring.desc_count - wq->ring.desc_avail - 1;
100 }
101
vnic_wq_next_desc(struct vnic_wq * wq)102 static inline void *vnic_wq_next_desc(struct vnic_wq *wq)
103 {
104 return wq->to_use->desc;
105 }
106
vnic_wq_post(struct vnic_wq * wq,void * os_buf,dma_addr_t dma_addr,unsigned int len,int sop,int eop,uint8_t desc_skip_cnt,uint8_t cq_entry,uint8_t compressed_send,uint64_t wrid)107 static inline void vnic_wq_post(struct vnic_wq *wq,
108 void *os_buf, dma_addr_t dma_addr,
109 unsigned int len, int sop, int eop,
110 uint8_t desc_skip_cnt, uint8_t cq_entry,
111 uint8_t compressed_send, uint64_t wrid)
112 {
113 struct vnic_wq_buf *buf = wq->to_use;
114
115 buf->sop = sop;
116 buf->cq_entry = cq_entry;
117 buf->compressed_send = compressed_send;
118 buf->desc_skip_cnt = desc_skip_cnt;
119 buf->os_buf = eop ? os_buf : NULL;
120 buf->dma_addr = dma_addr;
121 buf->len = len;
122 buf->wr_id = wrid;
123
124 buf = buf->next;
125 if (eop) {
126 /* Adding write memory barrier prevents compiler and/or CPU
127 * reordering, thus avoiding descriptor posting before
128 * descriptor is initialized. Otherwise, hardware can read
129 * stale descriptor fields.
130 */
131 wmb();
132 iowrite32(buf->index, &wq->ctrl->posted_index);
133 }
134 wq->to_use = buf;
135
136 wq->ring.desc_avail -= desc_skip_cnt;
137 }
138
vnic_wq_service(struct vnic_wq * wq,struct cq_desc * cq_desc,u16 completed_index,void (* buf_service)(struct vnic_wq * wq,struct cq_desc * cq_desc,struct vnic_wq_buf * buf,void * opaque),void * opaque)139 static inline void vnic_wq_service(struct vnic_wq *wq,
140 struct cq_desc *cq_desc, u16 completed_index,
141 void (*buf_service)(struct vnic_wq *wq,
142 struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque),
143 void *opaque)
144 {
145 struct vnic_wq_buf *buf;
146
147 buf = wq->to_clean;
148 while (1) {
149
150 (*buf_service)(wq, cq_desc, buf, opaque);
151
152 wq->ring.desc_avail++;
153
154 wq->to_clean = buf->next;
155
156 if (buf->index == completed_index)
157 break;
158
159 buf = wq->to_clean;
160 }
161 }
162
163 void vnic_wq_free(struct vnic_wq *wq);
164 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
165 unsigned int desc_count, unsigned int desc_size);
166 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
167 unsigned int error_interrupt_enable,
168 unsigned int error_interrupt_offset);
169 unsigned int vnic_wq_error_status(struct vnic_wq *wq);
170 void vnic_wq_enable(struct vnic_wq *wq);
171 int vnic_wq_disable(struct vnic_wq *wq);
172 void vnic_wq_clean(struct vnic_wq *wq,
173 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf));
174
175 #endif /* _VNIC_WQ_H_ */
176