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 struct vnic_wq_buf *prev;
66 };
67
68 /* Break the vnic_wq_buf allocations into blocks of 32/64 entries */
69 #define VNIC_WQ_BUF_MIN_BLK_ENTRIES 32
70 #define VNIC_WQ_BUF_DFLT_BLK_ENTRIES 64
71 #define VNIC_WQ_BUF_BLK_ENTRIES(entries) \
72 ((unsigned int)((entries < VNIC_WQ_BUF_DFLT_BLK_ENTRIES) ? \
73 VNIC_WQ_BUF_MIN_BLK_ENTRIES : VNIC_WQ_BUF_DFLT_BLK_ENTRIES))
74 #define VNIC_WQ_BUF_BLK_SZ(entries) \
75 (VNIC_WQ_BUF_BLK_ENTRIES(entries) * sizeof(struct vnic_wq_buf))
76 #define VNIC_WQ_BUF_BLKS_NEEDED(entries) \
77 DIV_ROUND_UP(entries, VNIC_WQ_BUF_BLK_ENTRIES(entries))
78 #define VNIC_WQ_BUF_BLKS_MAX VNIC_WQ_BUF_BLKS_NEEDED(4096)
79
80 struct vnic_wq {
81 unsigned int index;
82 struct vnic_dev *vdev;
83 struct vnic_wq_ctrl __iomem *ctrl; /* memory-mapped */
84 struct vnic_dev_ring ring;
85 struct vnic_wq_buf *bufs[VNIC_WQ_BUF_BLKS_MAX];
86 struct vnic_wq_buf *to_use;
87 struct vnic_wq_buf *to_clean;
88 unsigned int pkts_outstanding;
89 };
90
91 struct devcmd2_controller {
92 struct vnic_wq_ctrl __iomem *wq_ctrl;
93 struct vnic_devcmd2 *cmd_ring;
94 struct devcmd2_result *result;
95 u16 next_result;
96 u16 result_size;
97 int color;
98 struct vnic_dev_ring results_ring;
99 struct vnic_wq wq;
100 u32 posted;
101 };
102
vnic_wq_desc_avail(struct vnic_wq * wq)103 static inline unsigned int vnic_wq_desc_avail(struct vnic_wq *wq)
104 {
105 /* how many does SW own? */
106 return wq->ring.desc_avail;
107 }
108
vnic_wq_desc_used(struct vnic_wq * wq)109 static inline unsigned int vnic_wq_desc_used(struct vnic_wq *wq)
110 {
111 /* how many does HW own? */
112 return wq->ring.desc_count - wq->ring.desc_avail - 1;
113 }
114
vnic_wq_next_desc(struct vnic_wq * wq)115 static inline void *vnic_wq_next_desc(struct vnic_wq *wq)
116 {
117 return wq->to_use->desc;
118 }
119
vnic_wq_doorbell(struct vnic_wq * wq)120 static inline void vnic_wq_doorbell(struct vnic_wq *wq)
121 {
122 /* Adding write memory barrier prevents compiler and/or CPU
123 * reordering, thus avoiding descriptor posting before
124 * descriptor is initialized. Otherwise, hardware can read
125 * stale descriptor fields.
126 */
127 wmb();
128 iowrite32(wq->to_use->index, &wq->ctrl->posted_index);
129 }
130
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)131 static inline void vnic_wq_post(struct vnic_wq *wq,
132 void *os_buf, dma_addr_t dma_addr,
133 unsigned int len, int sop, int eop,
134 uint8_t desc_skip_cnt, uint8_t cq_entry,
135 uint8_t compressed_send, uint64_t wrid)
136 {
137 struct vnic_wq_buf *buf = wq->to_use;
138
139 buf->sop = sop;
140 buf->cq_entry = cq_entry;
141 buf->compressed_send = compressed_send;
142 buf->desc_skip_cnt = desc_skip_cnt;
143 buf->os_buf = eop ? os_buf : NULL;
144 buf->dma_addr = dma_addr;
145 buf->len = len;
146 buf->wr_id = wrid;
147
148 buf = buf->next;
149 wq->to_use = buf;
150
151 wq->ring.desc_avail -= desc_skip_cnt;
152 }
153
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)154 static inline void vnic_wq_service(struct vnic_wq *wq,
155 struct cq_desc *cq_desc, u16 completed_index,
156 void (*buf_service)(struct vnic_wq *wq,
157 struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque),
158 void *opaque)
159 {
160 struct vnic_wq_buf *buf;
161
162 buf = wq->to_clean;
163 while (1) {
164
165 (*buf_service)(wq, cq_desc, buf, opaque);
166
167 wq->ring.desc_avail++;
168
169 wq->to_clean = buf->next;
170
171 if (buf->index == completed_index)
172 break;
173
174 buf = wq->to_clean;
175 }
176 }
177
178 void vnic_wq_free(struct vnic_wq *wq);
179 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
180 unsigned int desc_count, unsigned int desc_size);
181 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
182 unsigned int error_interrupt_enable,
183 unsigned int error_interrupt_offset);
184 unsigned int vnic_wq_error_status(struct vnic_wq *wq);
185 void vnic_wq_enable(struct vnic_wq *wq);
186 int vnic_wq_disable(struct vnic_wq *wq);
187 void vnic_wq_clean(struct vnic_wq *wq,
188 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf));
189 int enic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
190 unsigned int desc_count, unsigned int desc_size);
191 void enic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
192 unsigned int fetch_index, unsigned int posted_index,
193 unsigned int error_interrupt_enable,
194 unsigned int error_interrupt_offset);
195
196 #endif /* _VNIC_WQ_H_ */
197