drivers/net/ethernet/cisco/enic/vnic_wq.h

   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         struct vnic_wq_buf *prev;
  66 };
  67
  68 /* Break the vnic_wq_buf allocations into blocks of 32/64 entries */
  69 #define VNIC_WQ_BUF_MIN_BLK_ENTRIES 32
  70 #define VNIC_WQ_BUF_DFLT_BLK_ENTRIES 64
  71 #define VNIC_WQ_BUF_BLK_ENTRIES(entries) \
  72         ((unsigned int)((entries < VNIC_WQ_BUF_DFLT_BLK_ENTRIES) ? \
  73         VNIC_WQ_BUF_MIN_BLK_ENTRIES : VNIC_WQ_BUF_DFLT_BLK_ENTRIES))
  74 #define VNIC_WQ_BUF_BLK_SZ(entries) \
  75         (VNIC_WQ_BUF_BLK_ENTRIES(entries) * sizeof(struct vnic_wq_buf))
  76 #define VNIC_WQ_BUF_BLKS_NEEDED(entries) \
  77         DIV_ROUND_UP(entries, VNIC_WQ_BUF_BLK_ENTRIES(entries))
  78 #define VNIC_WQ_BUF_BLKS_MAX VNIC_WQ_BUF_BLKS_NEEDED(4096)
  79
  80 struct vnic_wq {
  81         unsigned int index;
  82         struct vnic_dev *vdev;
  83         struct vnic_wq_ctrl __iomem *ctrl;              /* memory-mapped */
  84         struct vnic_dev_ring ring;
  85         struct vnic_wq_buf *bufs[VNIC_WQ_BUF_BLKS_MAX];
  86         struct vnic_wq_buf *to_use;
  87         struct vnic_wq_buf *to_clean;
  88         unsigned int pkts_outstanding;
  89 };
  90
  91 struct devcmd2_controller {
  92         struct vnic_wq_ctrl __iomem *wq_ctrl;
  93         struct vnic_devcmd2 *cmd_ring;
  94         struct devcmd2_result *result;
  95         u16 next_result;
  96         u16 result_size;
  97         int color;
  98         struct vnic_dev_ring results_ring;
  99         struct vnic_wq wq;
 100         u32 posted;
 101 };
 102
 103 static inline unsigned int vnic_wq_desc_avail(struct vnic_wq *wq)
 104 {
 105         /* how many does SW own? */
 106         return wq->ring.desc_avail;
 107 }
 108
 109 static inline unsigned int vnic_wq_desc_used(struct vnic_wq *wq)
 110 {
 111         /* how many does HW own? */
 112         return wq->ring.desc_count - wq->ring.desc_avail - 1;
 113 }
 114
 115 static inline void *vnic_wq_next_desc(struct vnic_wq *wq)
 116 {
 117         return wq->to_use->desc;
 118 }
 119
 120 static inline void vnic_wq_doorbell(struct vnic_wq *wq)
 121 {
 122         /* Adding write memory barrier prevents compiler and/or CPU
 123          * reordering, thus avoiding descriptor posting before
 124          * descriptor is initialized. Otherwise, hardware can read
 125          * stale descriptor fields.
 126          */
 127         wmb();
 128         iowrite32(wq->to_use->index, &wq->ctrl->posted_index);
 129 }
 130
 131 static inline void vnic_wq_post(struct vnic_wq *wq,
 132         void *os_buf, dma_addr_t dma_addr,
 133         unsigned int len, int sop, int eop,
 134         uint8_t desc_skip_cnt, uint8_t cq_entry,
 135         uint8_t compressed_send, uint64_t wrid)
 136 {
 137         struct vnic_wq_buf *buf = wq->to_use;
 138
 139         buf->sop = sop;
 140         buf->cq_entry = cq_entry;
 141         buf->compressed_send = compressed_send;
 142         buf->desc_skip_cnt = desc_skip_cnt;
 143         buf->os_buf = eop ? os_buf : NULL;
 144         buf->dma_addr = dma_addr;
 145         buf->len = len;
 146         buf->wr_id = wrid;
 147
 148         buf = buf->next;
 149         wq->to_use = buf;
 150
 151         wq->ring.desc_avail -= desc_skip_cnt;
 152 }
 153
 154 static inline void vnic_wq_service(struct vnic_wq *wq,
 155         struct cq_desc *cq_desc, u16 completed_index,
 156         void (*buf_service)(struct vnic_wq *wq,
 157         struct cq_desc *cq_desc, struct vnic_wq_buf *buf, void *opaque),
 158         void *opaque)
 159 {
 160         struct vnic_wq_buf *buf;
 161
 162         buf = wq->to_clean;
 163         while (1) {
 164
 165                 (*buf_service)(wq, cq_desc, buf, opaque);
 166
 167                 wq->ring.desc_avail++;
 168
 169                 wq->to_clean = buf->next;
 170
 171                 if (buf->index == completed_index)
 172                         break;
 173
 174                 buf = wq->to_clean;
 175         }
 176 }
 177
 178 void vnic_wq_free(struct vnic_wq *wq);
 179 int vnic_wq_alloc(struct vnic_dev *vdev, struct vnic_wq *wq, unsigned int index,
 180         unsigned int desc_count, unsigned int desc_size);
 181 void vnic_wq_init(struct vnic_wq *wq, unsigned int cq_index,
 182         unsigned int error_interrupt_enable,
 183         unsigned int error_interrupt_offset);
 184 unsigned int vnic_wq_error_status(struct vnic_wq *wq);
 185 void vnic_wq_enable(struct vnic_wq *wq);
 186 int vnic_wq_disable(struct vnic_wq *wq);
 187 void vnic_wq_clean(struct vnic_wq *wq,
 188         void (*buf_clean)(struct vnic_wq *wq, struct vnic_wq_buf *buf));
 189 int enic_wq_devcmd2_alloc(struct vnic_dev *vdev, struct vnic_wq *wq,
 190                           unsigned int desc_count, unsigned int desc_size);
 191 void enic_wq_init_start(struct vnic_wq *wq, unsigned int cq_index,
 192                         unsigned int fetch_index, unsigned int posted_index,
 193                         unsigned int error_interrupt_enable,
 194                         unsigned int error_interrupt_offset);
 195
 196 #endif /* _VNIC_WQ_H_ */