Abhijeet Joglekar | 5df6d73 | 2009-04-17 18:33:26 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2008 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 | #ifndef _VNIC_RQ_H_ |
| 19 | #define _VNIC_RQ_H_ |
| 20 | |
| 21 | #include <linux/pci.h> |
| 22 | #include "vnic_dev.h" |
| 23 | #include "vnic_cq.h" |
| 24 | |
| 25 | /* |
| 26 | * These defines avoid symbol clash between fnic and enic (Cisco 10G Eth |
| 27 | * Driver) when both are built with CONFIG options =y |
| 28 | */ |
| 29 | #define vnic_rq_desc_avail fnic_rq_desc_avail |
| 30 | #define vnic_rq_desc_used fnic_rq_desc_used |
| 31 | #define vnic_rq_next_desc fnic_rq_next_desc |
| 32 | #define vnic_rq_next_index fnic_rq_next_index |
| 33 | #define vnic_rq_next_buf_index fnic_rq_next_buf_index |
| 34 | #define vnic_rq_post fnic_rq_post |
| 35 | #define vnic_rq_posting_soon fnic_rq_posting_soon |
| 36 | #define vnic_rq_return_descs fnic_rq_return_descs |
| 37 | #define vnic_rq_service fnic_rq_service |
| 38 | #define vnic_rq_fill fnic_rq_fill |
| 39 | #define vnic_rq_free fnic_rq_free |
| 40 | #define vnic_rq_alloc fnic_rq_alloc |
| 41 | #define vnic_rq_init fnic_rq_init |
| 42 | #define vnic_rq_error_status fnic_rq_error_status |
| 43 | #define vnic_rq_enable fnic_rq_enable |
| 44 | #define vnic_rq_disable fnic_rq_disable |
| 45 | #define vnic_rq_clean fnic_rq_clean |
| 46 | |
| 47 | /* Receive queue control */ |
| 48 | struct vnic_rq_ctrl { |
| 49 | u64 ring_base; /* 0x00 */ |
| 50 | u32 ring_size; /* 0x08 */ |
| 51 | u32 pad0; |
| 52 | u32 posted_index; /* 0x10 */ |
| 53 | u32 pad1; |
| 54 | u32 cq_index; /* 0x18 */ |
| 55 | u32 pad2; |
| 56 | u32 enable; /* 0x20 */ |
| 57 | u32 pad3; |
| 58 | u32 running; /* 0x28 */ |
| 59 | u32 pad4; |
| 60 | u32 fetch_index; /* 0x30 */ |
| 61 | u32 pad5; |
| 62 | u32 error_interrupt_enable; /* 0x38 */ |
| 63 | u32 pad6; |
| 64 | u32 error_interrupt_offset; /* 0x40 */ |
| 65 | u32 pad7; |
| 66 | u32 error_status; /* 0x48 */ |
| 67 | u32 pad8; |
| 68 | u32 dropped_packet_count; /* 0x50 */ |
| 69 | u32 pad9; |
| 70 | u32 dropped_packet_count_rc; /* 0x58 */ |
| 71 | u32 pad10; |
| 72 | }; |
| 73 | |
| 74 | /* Break the vnic_rq_buf allocations into blocks of 64 entries */ |
| 75 | #define VNIC_RQ_BUF_BLK_ENTRIES 64 |
| 76 | #define VNIC_RQ_BUF_BLK_SZ \ |
| 77 | (VNIC_RQ_BUF_BLK_ENTRIES * sizeof(struct vnic_rq_buf)) |
| 78 | #define VNIC_RQ_BUF_BLKS_NEEDED(entries) \ |
| 79 | DIV_ROUND_UP(entries, VNIC_RQ_BUF_BLK_ENTRIES) |
| 80 | #define VNIC_RQ_BUF_BLKS_MAX VNIC_RQ_BUF_BLKS_NEEDED(4096) |
| 81 | |
| 82 | struct vnic_rq_buf { |
| 83 | struct vnic_rq_buf *next; |
| 84 | dma_addr_t dma_addr; |
| 85 | void *os_buf; |
| 86 | unsigned int os_buf_index; |
| 87 | unsigned int len; |
| 88 | unsigned int index; |
| 89 | void *desc; |
| 90 | }; |
| 91 | |
| 92 | struct vnic_rq { |
| 93 | unsigned int index; |
| 94 | struct vnic_dev *vdev; |
| 95 | struct vnic_rq_ctrl __iomem *ctrl; /* memory-mapped */ |
| 96 | struct vnic_dev_ring ring; |
| 97 | struct vnic_rq_buf *bufs[VNIC_RQ_BUF_BLKS_MAX]; |
| 98 | struct vnic_rq_buf *to_use; |
| 99 | struct vnic_rq_buf *to_clean; |
| 100 | void *os_buf_head; |
| 101 | unsigned int buf_index; |
| 102 | unsigned int pkts_outstanding; |
| 103 | }; |
| 104 | |
| 105 | static inline unsigned int vnic_rq_desc_avail(struct vnic_rq *rq) |
| 106 | { |
| 107 | /* how many does SW own? */ |
| 108 | return rq->ring.desc_avail; |
| 109 | } |
| 110 | |
| 111 | static inline unsigned int vnic_rq_desc_used(struct vnic_rq *rq) |
| 112 | { |
| 113 | /* how many does HW own? */ |
| 114 | return rq->ring.desc_count - rq->ring.desc_avail - 1; |
| 115 | } |
| 116 | |
| 117 | static inline void *vnic_rq_next_desc(struct vnic_rq *rq) |
| 118 | { |
| 119 | return rq->to_use->desc; |
| 120 | } |
| 121 | |
| 122 | static inline unsigned int vnic_rq_next_index(struct vnic_rq *rq) |
| 123 | { |
| 124 | return rq->to_use->index; |
| 125 | } |
| 126 | |
| 127 | static inline unsigned int vnic_rq_next_buf_index(struct vnic_rq *rq) |
| 128 | { |
| 129 | return rq->buf_index++; |
| 130 | } |
| 131 | |
| 132 | static inline void vnic_rq_post(struct vnic_rq *rq, |
| 133 | void *os_buf, unsigned int os_buf_index, |
| 134 | dma_addr_t dma_addr, unsigned int len) |
| 135 | { |
| 136 | struct vnic_rq_buf *buf = rq->to_use; |
| 137 | |
| 138 | buf->os_buf = os_buf; |
| 139 | buf->os_buf_index = os_buf_index; |
| 140 | buf->dma_addr = dma_addr; |
| 141 | buf->len = len; |
| 142 | |
| 143 | buf = buf->next; |
| 144 | rq->to_use = buf; |
| 145 | rq->ring.desc_avail--; |
| 146 | |
| 147 | /* Move the posted_index every nth descriptor |
| 148 | */ |
| 149 | |
| 150 | #ifndef VNIC_RQ_RETURN_RATE |
| 151 | #define VNIC_RQ_RETURN_RATE 0xf /* keep 2^n - 1 */ |
| 152 | #endif |
| 153 | |
| 154 | if ((buf->index & VNIC_RQ_RETURN_RATE) == 0) { |
| 155 | /* Adding write memory barrier prevents compiler and/or CPU |
| 156 | * reordering, thus avoiding descriptor posting before |
| 157 | * descriptor is initialized. Otherwise, hardware can read |
| 158 | * stale descriptor fields. |
| 159 | */ |
| 160 | wmb(); |
| 161 | iowrite32(buf->index, &rq->ctrl->posted_index); |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | static inline int vnic_rq_posting_soon(struct vnic_rq *rq) |
| 166 | { |
| 167 | return (rq->to_use->index & VNIC_RQ_RETURN_RATE) == 0; |
| 168 | } |
| 169 | |
| 170 | static inline void vnic_rq_return_descs(struct vnic_rq *rq, unsigned int count) |
| 171 | { |
| 172 | rq->ring.desc_avail += count; |
| 173 | } |
| 174 | |
| 175 | enum desc_return_options { |
| 176 | VNIC_RQ_RETURN_DESC, |
| 177 | VNIC_RQ_DEFER_RETURN_DESC, |
| 178 | }; |
| 179 | |
| 180 | static inline void vnic_rq_service(struct vnic_rq *rq, |
| 181 | struct cq_desc *cq_desc, u16 completed_index, |
| 182 | int desc_return, void (*buf_service)(struct vnic_rq *rq, |
| 183 | struct cq_desc *cq_desc, struct vnic_rq_buf *buf, |
| 184 | int skipped, void *opaque), void *opaque) |
| 185 | { |
| 186 | struct vnic_rq_buf *buf; |
| 187 | int skipped; |
| 188 | |
| 189 | buf = rq->to_clean; |
| 190 | while (1) { |
| 191 | |
| 192 | skipped = (buf->index != completed_index); |
| 193 | |
| 194 | (*buf_service)(rq, cq_desc, buf, skipped, opaque); |
| 195 | |
| 196 | if (desc_return == VNIC_RQ_RETURN_DESC) |
| 197 | rq->ring.desc_avail++; |
| 198 | |
| 199 | rq->to_clean = buf->next; |
| 200 | |
| 201 | if (!skipped) |
| 202 | break; |
| 203 | |
| 204 | buf = rq->to_clean; |
| 205 | } |
| 206 | } |
| 207 | |
| 208 | static inline int vnic_rq_fill(struct vnic_rq *rq, |
| 209 | int (*buf_fill)(struct vnic_rq *rq)) |
| 210 | { |
| 211 | int err; |
| 212 | |
| 213 | while (vnic_rq_desc_avail(rq) > 1) { |
| 214 | |
| 215 | err = (*buf_fill)(rq); |
| 216 | if (err) |
| 217 | return err; |
| 218 | } |
| 219 | |
| 220 | return 0; |
| 221 | } |
| 222 | |
| 223 | void vnic_rq_free(struct vnic_rq *rq); |
| 224 | int vnic_rq_alloc(struct vnic_dev *vdev, struct vnic_rq *rq, unsigned int index, |
| 225 | unsigned int desc_count, unsigned int desc_size); |
| 226 | void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index, |
| 227 | unsigned int error_interrupt_enable, |
| 228 | unsigned int error_interrupt_offset); |
| 229 | unsigned int vnic_rq_error_status(struct vnic_rq *rq); |
| 230 | void vnic_rq_enable(struct vnic_rq *rq); |
| 231 | int vnic_rq_disable(struct vnic_rq *rq); |
| 232 | void vnic_rq_clean(struct vnic_rq *rq, |
| 233 | void (*buf_clean)(struct vnic_rq *rq, struct vnic_rq_buf *buf)); |
| 234 | |
| 235 | #endif /* _VNIC_RQ_H_ */ |