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_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 unsigned int interrupt_offset; 61 }; 62 63 static inline unsigned int vnic_cq_service(struct vnic_cq *cq, 64 unsigned int work_to_do, 65 int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc, 66 u8 type, u16 q_number, u16 completed_index, void *opaque), 67 void *opaque) 68 { 69 struct cq_desc *cq_desc; 70 unsigned int work_done = 0; 71 u16 q_number, completed_index; 72 u8 type, color; 73 74 cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs + 75 cq->ring.desc_size * cq->to_clean); 76 cq_desc_dec(cq_desc, &type, &color, 77 &q_number, &completed_index); 78 79 while (color != cq->last_color) { 80 81 if ((*q_service)(cq->vdev, cq_desc, type, 82 q_number, completed_index, opaque)) 83 break; 84 85 cq->to_clean++; 86 if (cq->to_clean == cq->ring.desc_count) { 87 cq->to_clean = 0; 88 cq->last_color = cq->last_color ? 0 : 1; 89 } 90 91 cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs + 92 cq->ring.desc_size * cq->to_clean); 93 cq_desc_dec(cq_desc, &type, &color, 94 &q_number, &completed_index); 95 96 work_done++; 97 if (work_done >= work_to_do) 98 break; 99 } 100 101 return work_done; 102 } 103 104 void vnic_cq_free(struct vnic_cq *cq); 105 int vnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, unsigned int index, 106 unsigned int desc_count, unsigned int desc_size); 107 void vnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable, 108 unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail, 109 unsigned int cq_tail_color, unsigned int interrupt_enable, 110 unsigned int cq_entry_enable, unsigned int message_enable, 111 unsigned int interrupt_offset, u64 message_addr); 112 void vnic_cq_clean(struct vnic_cq *cq); 113 114 #endif /* _VNIC_CQ_H_ */ 115