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

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright 2008-2010 Cisco Systems, Inc.  All rights reserved.
   4  * Copyright 2007 Nuova Systems, Inc.  All rights reserved.
   5  */
   6
   7 #ifndef _VNIC_CQ_H_
   8 #define _VNIC_CQ_H_
   9
  10 #include "cq_desc.h"
  11 #include "vnic_dev.h"
  12
  13 /* Completion queue control */
  14 struct vnic_cq_ctrl {
  15         u64 ring_base;                  /* 0x00 */
  16         u32 ring_size;                  /* 0x08 */
  17         u32 pad0;
  18         u32 flow_control_enable;        /* 0x10 */
  19         u32 pad1;
  20         u32 color_enable;               /* 0x18 */
  21         u32 pad2;
  22         u32 cq_head;                    /* 0x20 */
  23         u32 pad3;
  24         u32 cq_tail;                    /* 0x28 */
  25         u32 pad4;
  26         u32 cq_tail_color;              /* 0x30 */
  27         u32 pad5;
  28         u32 interrupt_enable;           /* 0x38 */
  29         u32 pad6;
  30         u32 cq_entry_enable;            /* 0x40 */
  31         u32 pad7;
  32         u32 cq_message_enable;          /* 0x48 */
  33         u32 pad8;
  34         u32 interrupt_offset;           /* 0x50 */
  35         u32 pad9;
  36         u64 cq_message_addr;            /* 0x58 */
  37         u32 pad10;
  38 };
  39
  40 struct vnic_rx_bytes_counter {
  41         unsigned int small_pkt_bytes_cnt;
  42         unsigned int large_pkt_bytes_cnt;
  43 };
  44
  45 struct vnic_cq {
  46         unsigned int index;
  47         struct vnic_dev *vdev;
  48         struct vnic_cq_ctrl __iomem *ctrl;              /* memory-mapped */
  49         struct vnic_dev_ring ring;
  50         unsigned int to_clean;
  51         unsigned int last_color;
  52         unsigned int interrupt_offset;
  53         struct vnic_rx_bytes_counter pkt_size_counter;
  54         unsigned int cur_rx_coal_timeval;
  55         unsigned int tobe_rx_coal_timeval;
  56         ktime_t prev_ts;
  57 };
  58
  59 static inline unsigned int vnic_cq_service(struct vnic_cq *cq,
  60         unsigned int work_to_do,
  61         int (*q_service)(struct vnic_dev *vdev, struct cq_desc *cq_desc,
  62         u8 type, u16 q_number, u16 completed_index, void *opaque),
  63         void *opaque)
  64 {
  65         struct cq_desc *cq_desc;
  66         unsigned int work_done = 0;
  67         u16 q_number, completed_index;
  68         u8 type, color;
  69
  70         cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
  71                 cq->ring.desc_size * cq->to_clean);
  72         cq_desc_dec(cq_desc, &type, &color,
  73                 &q_number, &completed_index);
  74
  75         while (color != cq->last_color) {
  76
  77                 if ((*q_service)(cq->vdev, cq_desc, type,
  78                         q_number, completed_index, opaque))
  79                         break;
  80
  81                 cq->to_clean++;
  82                 if (cq->to_clean == cq->ring.desc_count) {
  83                         cq->to_clean = 0;
  84                         cq->last_color = cq->last_color ? 0 : 1;
  85                 }
  86
  87                 cq_desc = (struct cq_desc *)((u8 *)cq->ring.descs +
  88                         cq->ring.desc_size * cq->to_clean);
  89                 cq_desc_dec(cq_desc, &type, &color,
  90                         &q_number, &completed_index);
  91
  92                 work_done++;
  93                 if (work_done >= work_to_do)
  94                         break;
  95         }
  96
  97         return work_done;
  98 }
  99
 100 void vnic_cq_free(struct vnic_cq *cq);
 101 int vnic_cq_alloc(struct vnic_dev *vdev, struct vnic_cq *cq, unsigned int index,
 102         unsigned int desc_count, unsigned int desc_size);
 103 void vnic_cq_init(struct vnic_cq *cq, unsigned int flow_control_enable,
 104         unsigned int color_enable, unsigned int cq_head, unsigned int cq_tail,
 105         unsigned int cq_tail_color, unsigned int interrupt_enable,
 106         unsigned int cq_entry_enable, unsigned int message_enable,
 107         unsigned int interrupt_offset, u64 message_addr);
 108 void vnic_cq_clean(struct vnic_cq *cq);
 109
 110 #endif /* _VNIC_CQ_H_ */