1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* Copyright 2014 Cisco Systems, Inc. All rights reserved. */ 3 4 #ifndef _VNIC_WQ_H_ 5 #define _VNIC_WQ_H_ 6 7 #include <linux/pci.h> 8 #include "vnic_dev.h" 9 #include "vnic_cq.h" 10 11 /* Work queue control */ 12 struct vnic_wq_ctrl { 13 u64 ring_base; /* 0x00 */ 14 u32 ring_size; /* 0x08 */ 15 u32 pad0; 16 u32 posted_index; /* 0x10 */ 17 u32 pad1; 18 u32 cq_index; /* 0x18 */ 19 u32 pad2; 20 u32 enable; /* 0x20 */ 21 u32 pad3; 22 u32 running; /* 0x28 */ 23 u32 pad4; 24 u32 fetch_index; /* 0x30 */ 25 u32 pad5; 26 u32 dca_value; /* 0x38 */ 27 u32 pad6; 28 u32 error_interrupt_enable; /* 0x40 */ 29 u32 pad7; 30 u32 error_interrupt_offset; /* 0x48 */ 31 u32 pad8; 32 u32 error_status; /* 0x50 */ 33 u32 pad9; 34 }; 35 36 struct vnic_wq_buf { 37 struct vnic_wq_buf *next; 38 dma_addr_t dma_addr; 39 void *os_buf; 40 unsigned int len; 41 unsigned int index; 42 int sop; 43 void *desc; 44 }; 45 46 /* Break the vnic_wq_buf allocations into blocks of 64 entries */ 47 #define VNIC_WQ_BUF_MIN_BLK_ENTRIES 32 48 #define VNIC_WQ_BUF_DFLT_BLK_ENTRIES 64 49 #define VNIC_WQ_BUF_BLK_ENTRIES(entries) \ 50 ((unsigned int)(entries < VNIC_WQ_BUF_DFLT_BLK_ENTRIES) ? \ 51 VNIC_WQ_BUF_MIN_BLK_ENTRIES : VNIC_WQ_BUF_DFLT_BLK_ENTRIES) 52 #define VNIC_WQ_BUF_BLK_SZ \ 53 (VNIC_WQ_BUF_DFLT_BLK_ENTRIES * sizeof(struct vnic_wq_buf)) 54 #define VNIC_WQ_BUF_BLKS_NEEDED(entries) \ 55 DIV_ROUND_UP(entries, VNIC_WQ_BUF_DFLT_BLK_ENTRIES) 56 #define VNIC_WQ_BUF_BLKS_NEEDED(entries) \ 57 DIV_ROUND_UP(entries, VNIC_WQ_BUF_DFLT_BLK_ENTRIES) 58 #define VNIC_WQ_BUF_BLKS_MAX VNIC_WQ_BUF_BLKS_NEEDED(4096) 59 60 struct vnic_wq { 61 unsigned int index; 62 struct vnic_dev *vdev; 63 struct vnic_wq_ctrl __iomem *ctrl; /* memory-mapped */ 64 struct vnic_dev_ring ring; 65 struct vnic_wq_buf *bufs[VNIC_WQ_BUF_BLKS_MAX]; 66 struct vnic_wq_buf *to_use; 67 struct vnic_wq_buf *to_clean; 68 unsigned int pkts_outstanding; 69 }; 70 71 static inline unsigned int svnic_wq_desc_avail(struct vnic_wq *wq) 72 { 73 /* how many does SW own? */ 74 return wq->ring.desc_avail; 75 } 76 77 static inline unsigned int svnic_wq_desc_used(struct vnic_wq *wq) 78 { 79 /* how many does HW own? */ 80 return wq->ring.desc_count - wq->ring.desc_avail - 1; 81 } 82 83 static inline void *svnic_wq_next_desc(struct vnic_wq *wq) 84 { 85 return wq->to_use->desc; 86 } 87 88 static inline void svnic_wq_post(struct vnic_wq *wq, 89 void *os_buf, dma_addr_t dma_addr, 90 unsigned int len, int sop, int eop) 91 { 92 struct vnic_wq_buf *buf = wq->to_use; 93 94 buf->sop = sop; 95 buf->os_buf = eop ? os_buf : NULL; 96 buf->dma_addr = dma_addr; 97 buf->len = len; 98 99 buf = buf->next; 100 if (eop) { 101 /* Adding write memory barrier prevents compiler and/or CPU 102 * reordering, thus avoiding descriptor posting before 103 * descriptor is initialized. Otherwise, hardware can read 104 * stale descriptor fields. 105 */ 106 wmb(); 107 iowrite32(buf->index, &wq->ctrl->posted_index); 108 } 109 wq->to_use = buf; 110 111 wq->ring.desc_avail--; 112 } 113 114 static inline void svnic_wq_service(struct vnic_wq *wq, 115 struct cq_desc *cq_desc, u16 completed_index, 116 void (*buf_service)(struct vnic_wq *wq, 117 struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque), 118 void *opaque) 119 { 120 struct vnic_wq_buf *buf; 121 122 buf = wq->to_clean; 123 while (1) { 124 125 (*buf_service)(wq, cq_desc, buf, opaque); 126 127 wq->ring.desc_avail++; 128 129 wq->to_clean = buf->next; 130 131 if (buf->index == completed_index) 132 break; 133 134 buf = wq->to_clean; 135 } 136 } 137 138 void svnic_wq_free(struct vnic_wq *wq); 139 int svnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, 140 unsigned int index, unsigned int desc_count, unsigned int desc_size); 141 int vnic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, 142 unsigned int desc_count, unsigned int desc_size); 143 void vnic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index, 144 unsigned int fetch_index, unsigned int post_index, 145 unsigned int error_interrupt_enable, 146 unsigned int error_interrupt_offset); 147 148 void svnic_wq_init(struct vnic_wq *wq, unsigned int cq_index, 149 unsigned int error_interrupt_enable, 150 unsigned int error_interrupt_offset); 151 unsigned int svnic_wq_error_status(struct vnic_wq *wq); 152 void svnic_wq_enable(struct vnic_wq *wq); 153 int svnic_wq_disable(struct vnic_wq *wq); 154 void svnic_wq_clean(struct vnic_wq *wq, 155 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf)); 156 #endif /* _VNIC_WQ_H_ */ 157