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 struct nfp_net;
13 
14 /* Firmware ABI */
15 
16 enum nfp_ccm_type {
17 	NFP_CCM_TYPE_BPF_MAP_ALLOC	= 1,
18 	NFP_CCM_TYPE_BPF_MAP_FREE	= 2,
19 	NFP_CCM_TYPE_BPF_MAP_LOOKUP	= 3,
20 	NFP_CCM_TYPE_BPF_MAP_UPDATE	= 4,
21 	NFP_CCM_TYPE_BPF_MAP_DELETE	= 5,
22 	NFP_CCM_TYPE_BPF_MAP_GETNEXT	= 6,
23 	NFP_CCM_TYPE_BPF_MAP_GETFIRST	= 7,
24 	NFP_CCM_TYPE_BPF_BPF_EVENT	= 8,
25 	NFP_CCM_TYPE_CRYPTO_RESET	= 9,
26 	NFP_CCM_TYPE_CRYPTO_ADD		= 10,
27 	NFP_CCM_TYPE_CRYPTO_DEL		= 11,
28 	NFP_CCM_TYPE_CRYPTO_UPDATE	= 12,
29 	NFP_CCM_TYPE_CRYPTO_RESYNC	= 13,
30 	__NFP_CCM_TYPE_MAX,
31 };
32 
33 #define NFP_CCM_ABI_VERSION		1
34 
35 #define NFP_CCM_TYPE_REPLY_BIT		7
36 #define __NFP_CCM_REPLY(req)		(BIT(NFP_CCM_TYPE_REPLY_BIT) | (req))
37 
38 struct nfp_ccm_hdr {
39 	union {
40 		struct {
41 			u8 type;
42 			u8 ver;
43 			__be16 tag;
44 		};
45 		__be32 raw;
46 	};
47 };
48 
49 static inline u8 nfp_ccm_get_type(struct sk_buff *skb)
50 {
51 	struct nfp_ccm_hdr *hdr;
52 
53 	hdr = (struct nfp_ccm_hdr *)skb->data;
54 
55 	return hdr->type;
56 }
57 
58 static inline __be16 __nfp_ccm_get_tag(struct sk_buff *skb)
59 {
60 	struct nfp_ccm_hdr *hdr;
61 
62 	hdr = (struct nfp_ccm_hdr *)skb->data;
63 
64 	return hdr->tag;
65 }
66 
67 static inline unsigned int nfp_ccm_get_tag(struct sk_buff *skb)
68 {
69 	return be16_to_cpu(__nfp_ccm_get_tag(skb));
70 }
71 
72 #define NFP_NET_MBOX_TLV_TYPE		GENMASK(31, 16)
73 #define NFP_NET_MBOX_TLV_LEN		GENMASK(15, 0)
74 
75 enum nfp_ccm_mbox_tlv_type {
76 	NFP_NET_MBOX_TLV_TYPE_UNKNOWN	= 0,
77 	NFP_NET_MBOX_TLV_TYPE_END	= 1,
78 	NFP_NET_MBOX_TLV_TYPE_MSG	= 2,
79 	NFP_NET_MBOX_TLV_TYPE_MSG_NOSUP	= 3,
80 	NFP_NET_MBOX_TLV_TYPE_RESV	= 4,
81 };
82 
83 /* Implementation */
84 
85 /**
86  * struct nfp_ccm - common control message handling
87  * @app:		APP handle
88  *
89  * @tag_allocator:	bitmap of control message tags in use
90  * @tag_alloc_next:	next tag bit to allocate
91  * @tag_alloc_last:	next tag bit to be freed
92  *
93  * @replies:		received cmsg replies waiting to be consumed
94  * @wq:			work queue for waiting for cmsg replies
95  */
96 struct nfp_ccm {
97 	struct nfp_app *app;
98 
99 	DECLARE_BITMAP(tag_allocator, U16_MAX + 1);
100 	u16 tag_alloc_next;
101 	u16 tag_alloc_last;
102 
103 	struct sk_buff_head replies;
104 	wait_queue_head_t wq;
105 };
106 
107 int nfp_ccm_init(struct nfp_ccm *ccm, struct nfp_app *app);
108 void nfp_ccm_clean(struct nfp_ccm *ccm);
109 void nfp_ccm_rx(struct nfp_ccm *ccm, struct sk_buff *skb);
110 struct sk_buff *
111 nfp_ccm_communicate(struct nfp_ccm *ccm, struct sk_buff *skb,
112 		    enum nfp_ccm_type type, unsigned int reply_size);
113 
114 int nfp_ccm_mbox_alloc(struct nfp_net *nn);
115 void nfp_ccm_mbox_free(struct nfp_net *nn);
116 int nfp_ccm_mbox_init(struct nfp_net *nn);
117 void nfp_ccm_mbox_clean(struct nfp_net *nn);
118 bool nfp_ccm_mbox_fits(struct nfp_net *nn, unsigned int size);
119 struct sk_buff *
120 nfp_ccm_mbox_msg_alloc(struct nfp_net *nn, unsigned int req_size,
121 		       unsigned int reply_size, gfp_t flags);
122 int __nfp_ccm_mbox_communicate(struct nfp_net *nn, struct sk_buff *skb,
123 			       enum nfp_ccm_type type,
124 			       unsigned int reply_size,
125 			       unsigned int max_reply_size, bool critical);
126 int nfp_ccm_mbox_communicate(struct nfp_net *nn, struct sk_buff *skb,
127 			     enum nfp_ccm_type type,
128 			     unsigned int reply_size,
129 			     unsigned int max_reply_size);
130 int nfp_ccm_mbox_post(struct nfp_net *nn, struct sk_buff *skb,
131 		      enum nfp_ccm_type type, unsigned int max_reply_size);
132 #endif
133