1 /* 2 * Copyright 2014 Cisco Systems, Inc. All rights reserved. 3 * 4 * This program is free software; you may redistribute it and/or modify 5 * it under the terms of the GNU General Public License as published by 6 * the Free Software Foundation; version 2 of the License. 7 * 8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 15 * SOFTWARE. 16 */ 17 18 #ifndef _VNIC_CQ_H_ 19 #define _VNIC_CQ_H_ 20 21 #include "cq_desc.h" 22 #include "vnic_dev.h" 23 24 /* Completion queue control */ 25 struct vnic_cq_ctrl { 26 u64 ring_base; /* 0x00 */ 27 u32 ring_size; /* 0x08 */ 28 u32 pad0; 29 u32 flow_control_enable; /* 0x10 */ 30 u32 pad1; 31 u32 color_enable; /* 0x18 */ 32 u32 pad2; 33 u32 cq_head; /* 0x20 */ 34 u32 pad3; 35 u32 cq_tail; /* 0x28 */ 36 u32 pad4; 37 u32 cq_tail_color; /* 0x30 */ 38 u32 pad5; 39 u32 interrupt_enable; /* 0x38 */ 40 u32 pad6; 41 u32 cq_entry_enable; /* 0x40 */ 42 u32 pad7; 43 u32 cq_message_enable; /* 0x48 */ 44 u32 pad8; 45 u32 interrupt_offset; /* 0x50 */ 46 u32 pad9; 47 u64 cq_message_addr; /* 0x58 */ 48 u32 pad10; 49 }; 50 51 struct vnic_cq { 52 unsigned int index; 53 struct vnic_dev *vdev; 54 struct vnic_cq_ctrl __iomem *ctrl; /* memory-mapped */ 55 struct vnic_dev_ring ring; 56 unsigned int to_clean; 57 unsigned int last_color; 58 }; 59 60 static inline unsigned int svnic_cq_service(struct vnic_cq *cq, 61 unsigned int work_to_do, 62 int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc, 63 u8 type, u16 q_number, u16 completed_index, void *opaque), 64 void *opaque) 65 { 66 struct cq_desc *cq_desc; 67 unsigned int work_done = 0; 68 u16 q_number, completed_index; 69 u8 type, color; 70 71 cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs + 72 cq->ring.desc_size * cq->to_clean); 73 cq_desc_dec(cq_desc, &type, &color, 74 &q_number, &completed_index); 75 76 while (color != cq->last_color) { 77 78 if ((*q_service)(cq->vdev, cq_desc, type, 79 q_number, completed_index, opaque)) 80 break; 81 82 cq->to_clean++; 83 if (cq->to_clean == cq->ring.desc_count) { 84 cq->to_clean = 0; 85 cq->last_color = cq->last_color ? 0 : 1; 86 } 87 88 cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs + 89 cq->ring.desc_size * cq->to_clean); 90 cq_desc_dec(cq_desc, &type, &color, 91 &q_number, &completed_index); 92 93 work_done++; 94 if (work_done >= work_to_do) 95 break; 96 } 97 98 return work_done; 99 } 100 101 void svnic_cq_free(struct vnic_cq *cq); 102 int svnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, 103 unsigned int index, unsigned int desc_count, unsigned int desc_size); 104 void svnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable, 105 unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail, 106 unsigned int cq_tail_color, unsigned int interrupt_enable, 107 unsigned int cq_entry_enable, unsigned int message_enable, 108 unsigned int interrupt_offset, u64 message_addr); 109 void svnic_cq_clean(struct vnic_cq *cq); 110 #endif /* _VNIC_CQ_H_ */ 111