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_WQ_H_ 21 #define _VNIC_WQ_H_ 22 23 #include <linux/pci.h> 24 25 #include "vnic_dev.h" 26 #include "vnic_cq.h" 27 28 /* Work queue control */ 29 struct vnic_wq_ctrl { 30 u64 ring_base; /* 0x00 */ 31 u32 ring_size; /* 0x08 */ 32 u32 pad0; 33 u32 posted_index; /* 0x10 */ 34 u32 pad1; 35 u32 cq_index; /* 0x18 */ 36 u32 pad2; 37 u32 enable; /* 0x20 */ 38 u32 pad3; 39 u32 running; /* 0x28 */ 40 u32 pad4; 41 u32 fetch_index; /* 0x30 */ 42 u32 pad5; 43 u32 dca_value; /* 0x38 */ 44 u32 pad6; 45 u32 error_interrupt_enable; /* 0x40 */ 46 u32 pad7; 47 u32 error_interrupt_offset; /* 0x48 */ 48 u32 pad8; 49 u32 error_status; /* 0x50 */ 50 u32 pad9; 51 }; 52 53 struct vnic_wq_buf { 54 struct vnic_wq_buf *next; 55 dma_addr_t dma_addr; 56 void *os_buf; 57 unsigned int len; 58 unsigned int index; 59 int sop; 60 void *desc; 61 uint64_t wr_id; /* Cookie */ 62 uint8_t cq_entry; /* Gets completion event from hw */ 63 uint8_t desc_skip_cnt; /* Num descs to occupy */ 64 uint8_t compressed_send; /* Both hdr and payload in one desc */ 65 }; 66 67 /* Break the vnic_wq_buf allocations into blocks of 32/64 entries */ 68 #define VNIC_WQ_BUF_MIN_BLK_ENTRIES 32 69 #define VNIC_WQ_BUF_DFLT_BLK_ENTRIES 64 70 #define VNIC_WQ_BUF_BLK_ENTRIES(entries) \ 71 ((unsigned int)((entries < VNIC_WQ_BUF_DFLT_BLK_ENTRIES) ? \ 72 VNIC_WQ_BUF_MIN_BLK_ENTRIES : VNIC_WQ_BUF_DFLT_BLK_ENTRIES)) 73 #define VNIC_WQ_BUF_BLK_SZ(entries) \ 74 (VNIC_WQ_BUF_BLK_ENTRIES(entries) * sizeof(struct vnic_wq_buf)) 75 #define VNIC_WQ_BUF_BLKS_NEEDED(entries) \ 76 DIV_ROUND_UP(entries, VNIC_WQ_BUF_BLK_ENTRIES(entries)) 77 #define VNIC_WQ_BUF_BLKS_MAX VNIC_WQ_BUF_BLKS_NEEDED(4096) 78 79 struct vnic_wq { 80 unsigned int index; 81 struct vnic_dev *vdev; 82 struct vnic_wq_ctrl __iomem *ctrl; /* memory-mapped */ 83 struct vnic_dev_ring ring; 84 struct vnic_wq_buf *bufs[VNIC_WQ_BUF_BLKS_MAX]; 85 struct vnic_wq_buf *to_use; 86 struct vnic_wq_buf *to_clean; 87 unsigned int pkts_outstanding; 88 }; 89 90 static inline unsigned int vnic_wq_desc_avail(struct vnic_wq *wq) 91 { 92 /* how many does SW own? */ 93 return wq->ring.desc_avail; 94 } 95 96 static inline unsigned int vnic_wq_desc_used(struct vnic_wq *wq) 97 { 98 /* how many does HW own? */ 99 return wq->ring.desc_count - wq->ring.desc_avail - 1; 100 } 101 102 static inline void *vnic_wq_next_desc(struct vnic_wq *wq) 103 { 104 return wq->to_use->desc; 105 } 106 107 static inline void vnic_wq_doorbell(struct vnic_wq *wq) 108 { 109 /* Adding write memory barrier prevents compiler and/or CPU 110 * reordering, thus avoiding descriptor posting before 111 * descriptor is initialized. Otherwise, hardware can read 112 * stale descriptor fields. 113 */ 114 wmb(); 115 iowrite32(wq->to_use->index, &wq->ctrl->posted_index); 116 } 117 118 static inline void vnic_wq_post(struct vnic_wq *wq, 119 void *os_buf, dma_addr_t dma_addr, 120 unsigned int len, int sop, int eop, 121 uint8_t desc_skip_cnt, uint8_t cq_entry, 122 uint8_t compressed_send, uint64_t wrid) 123 { 124 struct vnic_wq_buf *buf = wq->to_use; 125 126 buf->sop = sop; 127 buf->cq_entry = cq_entry; 128 buf->compressed_send = compressed_send; 129 buf->desc_skip_cnt = desc_skip_cnt; 130 buf->os_buf = eop ? os_buf : NULL; 131 buf->dma_addr = dma_addr; 132 buf->len = len; 133 buf->wr_id = wrid; 134 135 buf = buf->next; 136 wq->to_use = buf; 137 138 wq->ring.desc_avail -= desc_skip_cnt; 139 } 140 141 static inline void vnic_wq_service(struct vnic_wq *wq, 142 struct cq_desc *cq_desc, u16 completed_index, 143 void (*buf_service)(struct vnic_wq *wq, 144 struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque), 145 void *opaque) 146 { 147 struct vnic_wq_buf *buf; 148 149 buf = wq->to_clean; 150 while (1) { 151 152 (*buf_service)(wq, cq_desc, buf, opaque); 153 154 wq->ring.desc_avail++; 155 156 wq->to_clean = buf->next; 157 158 if (buf->index == completed_index) 159 break; 160 161 buf = wq->to_clean; 162 } 163 } 164 165 void vnic_wq_free(struct vnic_wq *wq); 166 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index, 167 unsigned int desc_count, unsigned int desc_size); 168 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index, 169 unsigned int error_interrupt_enable, 170 unsigned int error_interrupt_offset); 171 unsigned int vnic_wq_error_status(struct vnic_wq *wq); 172 void vnic_wq_enable(struct vnic_wq *wq); 173 int vnic_wq_disable(struct vnic_wq *wq); 174 void vnic_wq_clean(struct vnic_wq *wq, 175 void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf)); 176 177 #endif /* _VNIC_WQ_H_ */ 178