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_CQ_H_ 19 #define _VNIC_CQ_H_ 20 21 #include "cq_desc.h" 22 #include "vnic_dev.h" 23 24 /* 25 * These defines avoid symbol clash between fnic and enic (Cisco 10G Eth 26 * Driver) when both are built with CONFIG options =y 27 */ 28 #define vnic_cq_service fnic_cq_service 29 #define vnic_cq_free fnic_cq_free 30 #define vnic_cq_alloc fnic_cq_alloc 31 #define vnic_cq_init fnic_cq_init 32 #define vnic_cq_clean fnic_cq_clean 33 34 /* Completion queue control */ 35 struct vnic_cq_ctrl { 36 u64 ring_base; /* 0x00 */ 37 u32 ring_size; /* 0x08 */ 38 u32 pad0; 39 u32 flow_control_enable; /* 0x10 */ 40 u32 pad1; 41 u32 color_enable; /* 0x18 */ 42 u32 pad2; 43 u32 cq_head; /* 0x20 */ 44 u32 pad3; 45 u32 cq_tail; /* 0x28 */ 46 u32 pad4; 47 u32 cq_tail_color; /* 0x30 */ 48 u32 pad5; 49 u32 interrupt_enable; /* 0x38 */ 50 u32 pad6; 51 u32 cq_entry_enable; /* 0x40 */ 52 u32 pad7; 53 u32 cq_message_enable; /* 0x48 */ 54 u32 pad8; 55 u32 interrupt_offset; /* 0x50 */ 56 u32 pad9; 57 u64 cq_message_addr; /* 0x58 */ 58 u32 pad10; 59 }; 60 61 struct vnic_cq { 62 unsigned int index; 63 struct vnic_dev *vdev; 64 struct vnic_cq_ctrl __iomem *ctrl; /* memory-mapped */ 65 struct vnic_dev_ring ring; 66 unsigned int to_clean; 67 unsigned int last_color; 68 }; 69 70 static inline unsigned int vnic_cq_service(struct vnic_cq *cq, 71 unsigned int work_to_do, 72 int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc, 73 u8 type, u16 q_number, u16 completed_index, void *opaque), 74 void *opaque) 75 { 76 struct cq_desc *cq_desc; 77 unsigned int work_done = 0; 78 u16 q_number, completed_index; 79 u8 type, color; 80 81 cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs + 82 cq->ring.desc_size * cq->to_clean); 83 cq_desc_dec(cq_desc, &type, &color, 84 &q_number, &completed_index); 85 86 while (color != cq->last_color) { 87 88 if ((*q_service)(cq->vdev, cq_desc, type, 89 q_number, completed_index, opaque)) 90 break; 91 92 cq->to_clean++; 93 if (cq->to_clean == cq->ring.desc_count) { 94 cq->to_clean = 0; 95 cq->last_color = cq->last_color ? 0 : 1; 96 } 97 98 cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs + 99 cq->ring.desc_size * cq->to_clean); 100 cq_desc_dec(cq_desc, &type, &color, 101 &q_number, &completed_index); 102 103 work_done++; 104 if (work_done >= work_to_do) 105 break; 106 } 107 108 return work_done; 109 } 110 111 void vnic_cq_free(struct vnic_cq *cq); 112 int vnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, unsigned int index, 113 unsigned int desc_count, unsigned int desc_size); 114 void vnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable, 115 unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail, 116 unsigned int cq_tail_color, unsigned int interrupt_enable, 117 unsigned int cq_entry_enable, unsigned int message_enable, 118 unsigned int interrupt_offset, u64 message_addr); 119 void vnic_cq_clean(struct vnic_cq *cq); 120 121 #endif /* _VNIC_CQ_H_ */ 122