1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* Copyright 2014 Cisco Systems, Inc. All rights reserved. */ 3 4 #ifndef _VNIC_CQ_H_ 5 #define _VNIC_CQ_H_ 6 7 #include "cq_desc.h" 8 #include "vnic_dev.h" 9 10 /* Completion queue control */ 11 struct vnic_cq_ctrl { 12 u64 ring_base; /* 0x00 */ 13 u32 ring_size; /* 0x08 */ 14 u32 pad0; 15 u32 flow_control_enable; /* 0x10 */ 16 u32 pad1; 17 u32 color_enable; /* 0x18 */ 18 u32 pad2; 19 u32 cq_head; /* 0x20 */ 20 u32 pad3; 21 u32 cq_tail; /* 0x28 */ 22 u32 pad4; 23 u32 cq_tail_color; /* 0x30 */ 24 u32 pad5; 25 u32 interrupt_enable; /* 0x38 */ 26 u32 pad6; 27 u32 cq_entry_enable; /* 0x40 */ 28 u32 pad7; 29 u32 cq_message_enable; /* 0x48 */ 30 u32 pad8; 31 u32 interrupt_offset; /* 0x50 */ 32 u32 pad9; 33 u64 cq_message_addr; /* 0x58 */ 34 u32 pad10; 35 }; 36 37 struct vnic_cq { 38 unsigned int index; 39 struct vnic_dev *vdev; 40 struct vnic_cq_ctrl __iomem *ctrl; /* memory-mapped */ 41 struct vnic_dev_ring ring; 42 unsigned int to_clean; 43 unsigned int last_color; 44 }; 45 46 static inline unsigned int svnic_cq_service(struct vnic_cq *cq, 47 unsigned int work_to_do, 48 int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc, 49 u8 type, u16 q_number, u16 completed_index, void *opaque), 50 void *opaque) 51 { 52 struct cq_desc *cq_desc; 53 unsigned int work_done = 0; 54 u16 q_number, completed_index; 55 u8 type, color; 56 57 cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs + 58 cq->ring.desc_size * cq->to_clean); 59 cq_desc_dec(cq_desc, &type, &color, 60 &q_number, &completed_index); 61 62 while (color != cq->last_color) { 63 64 if ((*q_service)(cq->vdev, cq_desc, type, 65 q_number, completed_index, opaque)) 66 break; 67 68 cq->to_clean++; 69 if (cq->to_clean == cq->ring.desc_count) { 70 cq->to_clean = 0; 71 cq->last_color = cq->last_color ? 0 : 1; 72 } 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 work_done++; 80 if (work_done >= work_to_do) 81 break; 82 } 83 84 return work_done; 85 } 86 87 void svnic_cq_free(struct vnic_cq *cq); 88 int svnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, 89 unsigned int index, unsigned int desc_count, unsigned int desc_size); 90 void svnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable, 91 unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail, 92 unsigned int cq_tail_color, unsigned int interrupt_enable, 93 unsigned int cq_entry_enable, unsigned int message_enable, 94 unsigned int interrupt_offset, u64 message_addr); 95 void svnic_cq_clean(struct vnic_cq *cq); 96 #endif /* _VNIC_CQ_H_ */ 97