| Scott Feldman | 01f2e4e | 2008-09-15 09:17:11 -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 | */ |
| 19 | |
| 20 | #ifndef _VNIC_CQ_H_ |
| 21 | #define _VNIC_CQ_H_ |
| 22 | |
| 23 | #include "cq_desc.h" |
| 24 | #include "vnic_dev.h" |
| 25 | |
| 26 | /* Completion queue control */ |
| 27 | struct vnic_cq_ctrl { |
| 28 | u64 ring_base; /* 0x00 */ |
| 29 | u32 ring_size; /* 0x08 */ |
| 30 | u32 pad0; |
| 31 | u32 flow_control_enable; /* 0x10 */ |
| 32 | u32 pad1; |
| 33 | u32 color_enable; /* 0x18 */ |
| 34 | u32 pad2; |
| 35 | u32 cq_head; /* 0x20 */ |
| 36 | u32 pad3; |
| 37 | u32 cq_tail; /* 0x28 */ |
| 38 | u32 pad4; |
| 39 | u32 cq_tail_color; /* 0x30 */ |
| 40 | u32 pad5; |
| 41 | u32 interrupt_enable; /* 0x38 */ |
| 42 | u32 pad6; |
| 43 | u32 cq_entry_enable; /* 0x40 */ |
| 44 | u32 pad7; |
| 45 | u32 cq_message_enable; /* 0x48 */ |
| 46 | u32 pad8; |
| 47 | u32 interrupt_offset; /* 0x50 */ |
| 48 | u32 pad9; |
| 49 | u64 cq_message_addr; /* 0x58 */ |
| 50 | u32 pad10; |
| 51 | }; |
| 52 | |
| 53 | struct vnic_cq { |
| 54 | unsigned int index; |
| 55 | struct vnic_dev *vdev; |
| 56 | struct vnic_cq_ctrl __iomem *ctrl; /* memory-mapped */ |
| 57 | struct vnic_dev_ring ring; |
| 58 | unsigned int to_clean; |
| 59 | unsigned int last_color; |
| 60 | }; |
| 61 | |
| 62 | static inline unsigned int vnic_cq_service(struct vnic_cq *cq, |
| 63 | unsigned int work_to_do, |
| 64 | int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc, |
| 65 | u8 type, u16 q_number, u16 completed_index, void *opaque), |
| 66 | void *opaque) |
| 67 | { |
| 68 | struct cq_desc *cq_desc; |
| 69 | unsigned int work_done = 0; |
| 70 | u16 q_number, completed_index; |
| 71 | u8 type, color; |
| 72 | |
| 73 | cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs + |
| 74 | cq->ring.desc_size * cq->to_clean); |
| 75 | cq_desc_dec(cq_desc, &type, &color, |
| 76 | &q_number, &completed_index); |
| 77 | |
| 78 | while (color != cq->last_color) { |
| 79 | |
| 80 | if ((*q_service)(cq->vdev, cq_desc, type, |
| 81 | q_number, completed_index, opaque)) |
| 82 | break; |
| 83 | |
| 84 | cq->to_clean++; |
| 85 | if (cq->to_clean == cq->ring.desc_count) { |
| 86 | cq->to_clean = 0; |
| 87 | cq->last_color = cq->last_color ? 0 : 1; |
| 88 | } |
| 89 | |
| 90 | cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs + |
| 91 | cq->ring.desc_size * cq->to_clean); |
| 92 | cq_desc_dec(cq_desc, &type, &color, |
| 93 | &q_number, &completed_index); |
| 94 | |
| 95 | work_done++; |
| 96 | if (work_done >= work_to_do) |
| 97 | break; |
| 98 | } |
| 99 | |
| 100 | return work_done; |
| 101 | } |
| 102 | |
| 103 | void vnic_cq_free(struct vnic_cq *cq); |
| 104 | int vnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, unsigned int index, |
| 105 | unsigned int desc_count, unsigned int desc_size); |
| 106 | void vnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable, |
| 107 | unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail, |
| 108 | unsigned int cq_tail_color, unsigned int interrupt_enable, |
| 109 | unsigned int cq_entry_enable, unsigned int message_enable, |
| 110 | unsigned int interrupt_offset, u64 message_addr); |
| 111 | void vnic_cq_clean(struct vnic_cq *cq); |
| 112 | |
| 113 | #endif /* _VNIC_CQ_H_ */ |