drivers/net/ethernet/netronome/nfp/ccm.h

   1 /* SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) */
   2 /* Copyright (C) 2016-2019 Netronome Systems, Inc. */
   3
   4 #ifndef NFP_CCM_H
   5 #define NFP_CCM_H 1
   6
   7 #include <linux/bitmap.h>
   8 #include <linux/skbuff.h>
   9 #include <linux/wait.h>
  10
  11 struct nfp_app;
  12
  13 /* Firmware ABI */
  14
  15 enum nfp_ccm_type {
  16         NFP_CCM_TYPE_BPF_MAP_ALLOC      = 1,
  17         NFP_CCM_TYPE_BPF_MAP_FREE       = 2,
  18         NFP_CCM_TYPE_BPF_MAP_LOOKUP     = 3,
  19         NFP_CCM_TYPE_BPF_MAP_UPDATE     = 4,
  20         NFP_CCM_TYPE_BPF_MAP_DELETE     = 5,
  21         NFP_CCM_TYPE_BPF_MAP_GETNEXT    = 6,
  22         NFP_CCM_TYPE_BPF_MAP_GETFIRST   = 7,
  23         NFP_CCM_TYPE_BPF_BPF_EVENT      = 8,
  24         __NFP_CCM_TYPE_MAX,
  25 };
  26
  27 #define NFP_CCM_ABI_VERSION             1
  28
  29 struct nfp_ccm_hdr {
  30         u8 type;
  31         u8 ver;
  32         __be16 tag;
  33 };
  34
  35 static inline u8 nfp_ccm_get_type(struct sk_buff *skb)
  36 {
  37         struct nfp_ccm_hdr *hdr;
  38
  39         hdr = (struct nfp_ccm_hdr *)skb->data;
  40
  41         return hdr->type;
  42 }
  43
  44 static inline unsigned int nfp_ccm_get_tag(struct sk_buff *skb)
  45 {
  46         struct nfp_ccm_hdr *hdr;
  47
  48         hdr = (struct nfp_ccm_hdr *)skb->data;
  49
  50         return be16_to_cpu(hdr->tag);
  51 }
  52
  53 /* Implementation */
  54
  55 /**
  56  * struct nfp_ccm - common control message handling
  57  * @app:                APP handle
  58  *
  59  * @tag_allocator:      bitmap of control message tags in use
  60  * @tag_alloc_next:     next tag bit to allocate
  61  * @tag_alloc_last:     next tag bit to be freed
  62  *
  63  * @replies:            received cmsg replies waiting to be consumed
  64  * @wq:                 work queue for waiting for cmsg replies
  65  */
  66 struct nfp_ccm {
  67         struct nfp_app *app;
  68
  69         DECLARE_BITMAP(tag_allocator, U16_MAX + 1);
  70         u16 tag_alloc_next;
  71         u16 tag_alloc_last;
  72
  73         struct sk_buff_head replies;
  74         struct wait_queue_head wq;
  75 };
  76
  77 int nfp_ccm_init(struct nfp_ccm *ccm, struct nfp_app *app);
  78 void nfp_ccm_clean(struct nfp_ccm *ccm);
  79 void nfp_ccm_rx(struct nfp_ccm *ccm, struct sk_buff *skb);
  80 struct sk_buff *
  81 nfp_ccm_communicate(struct nfp_ccm *ccm, struct sk_buff *skb,
  82                     enum nfp_ccm_type type, unsigned int reply_size);
  83 #endif