1 | /* |
2 | * Copyright (c) 2006-2008 Chelsio, Inc. All rights reserved. |
3 | * |
4 | * This software is available to you under a choice of one of two |
5 | * licenses. You may choose to be licensed under the terms of the GNU |
6 | * General Public License (GPL) Version 2, available from the file |
7 | * COPYING in the main directory of this source tree, or the |
8 | * OpenIB.org BSD license below: |
9 | * |
10 | * Redistribution and use in source and binary forms, with or |
11 | * without modification, are permitted provided that the following |
12 | * conditions are met: |
13 | * |
14 | * - Redistributions of source code must retain the above |
15 | * copyright notice, this list of conditions and the following |
16 | * disclaimer. |
17 | * |
18 | * - Redistributions in binary form must reproduce the above |
19 | * copyright notice, this list of conditions and the following |
20 | * disclaimer in the documentation and/or other materials |
21 | * provided with the distribution. |
22 | * |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
30 | * SOFTWARE. |
31 | */ |
32 | #ifndef _CXGB3_OFFLOAD_H |
33 | #define _CXGB3_OFFLOAD_H |
34 | |
35 | #include <linux/list.h> |
36 | #include <linux/skbuff.h> |
37 | |
38 | #include "l2t.h" |
39 | |
40 | #include "t3cdev.h" |
41 | #include "t3_cpl.h" |
42 | |
43 | struct adapter; |
44 | |
45 | void cxgb3_offload_init(void); |
46 | |
47 | void cxgb3_adapter_ofld(struct adapter *adapter); |
48 | void cxgb3_adapter_unofld(struct adapter *adapter); |
49 | int cxgb3_offload_activate(struct adapter *adapter); |
50 | void cxgb3_offload_deactivate(struct adapter *adapter); |
51 | |
52 | void cxgb3_set_dummy_ops(struct t3cdev *dev); |
53 | |
54 | struct t3cdev *dev2t3cdev(struct net_device *dev); |
55 | |
56 | /* |
57 | * Client registration. Users of T3 driver must register themselves. |
58 | * The T3 driver will call the add function of every client for each T3 |
59 | * adapter activated, passing up the t3cdev ptr. Each client fills out an |
60 | * array of callback functions to process CPL messages. |
61 | */ |
62 | |
63 | void cxgb3_register_client(struct cxgb3_client *client); |
64 | void cxgb3_unregister_client(struct cxgb3_client *client); |
65 | void cxgb3_add_clients(struct t3cdev *tdev); |
66 | void cxgb3_remove_clients(struct t3cdev *tdev); |
67 | void cxgb3_event_notify(struct t3cdev *tdev, u32 event, u32 port); |
68 | |
69 | typedef int (*cxgb3_cpl_handler_func)(struct t3cdev *dev, |
70 | struct sk_buff *skb, void *ctx); |
71 | |
72 | enum { |
73 | OFFLOAD_STATUS_UP, |
74 | OFFLOAD_STATUS_DOWN, |
75 | OFFLOAD_PORT_DOWN, |
76 | OFFLOAD_PORT_UP, |
77 | OFFLOAD_DB_FULL, |
78 | OFFLOAD_DB_EMPTY, |
79 | OFFLOAD_DB_DROP |
80 | }; |
81 | |
82 | struct cxgb3_client { |
83 | char *name; |
84 | void (*add) (struct t3cdev *); |
85 | void (*remove) (struct t3cdev *); |
86 | cxgb3_cpl_handler_func *handlers; |
87 | int (*redirect)(void *ctx, struct dst_entry *old, |
88 | struct dst_entry *new, struct l2t_entry *l2t); |
89 | struct list_head client_list; |
90 | void (*event_handler)(struct t3cdev *tdev, u32 event, u32 port); |
91 | }; |
92 | |
93 | /* |
94 | * TID allocation services. |
95 | */ |
96 | int cxgb3_alloc_atid(struct t3cdev *dev, struct cxgb3_client *client, |
97 | void *ctx); |
98 | int cxgb3_alloc_stid(struct t3cdev *dev, struct cxgb3_client *client, |
99 | void *ctx); |
100 | void *cxgb3_free_atid(struct t3cdev *dev, int atid); |
101 | void cxgb3_free_stid(struct t3cdev *dev, int stid); |
102 | void cxgb3_insert_tid(struct t3cdev *dev, struct cxgb3_client *client, |
103 | void *ctx, unsigned int tid); |
104 | void cxgb3_queue_tid_release(struct t3cdev *dev, unsigned int tid); |
105 | void cxgb3_remove_tid(struct t3cdev *dev, void *ctx, unsigned int tid); |
106 | |
107 | struct t3c_tid_entry { |
108 | struct cxgb3_client *client; |
109 | void *ctx; |
110 | }; |
111 | |
112 | /* CPL message priority levels */ |
113 | enum { |
114 | CPL_PRIORITY_DATA = 0, /* data messages */ |
115 | CPL_PRIORITY_SETUP = 1, /* connection setup messages */ |
116 | CPL_PRIORITY_TEARDOWN = 0, /* connection teardown messages */ |
117 | CPL_PRIORITY_LISTEN = 1, /* listen start/stop messages */ |
118 | CPL_PRIORITY_ACK = 1, /* RX ACK messages */ |
119 | CPL_PRIORITY_CONTROL = 1 /* offload control messages */ |
120 | }; |
121 | |
122 | /* Flags for return value of CPL message handlers */ |
123 | enum { |
124 | CPL_RET_BUF_DONE = 1, /* buffer processing done, buffer may be freed */ |
125 | CPL_RET_BAD_MSG = 2, /* bad CPL message (e.g., unknown opcode) */ |
126 | CPL_RET_UNKNOWN_TID = 4 /* unexpected unknown TID */ |
127 | }; |
128 | |
129 | typedef int (*cpl_handler_func)(struct t3cdev *dev, struct sk_buff *skb); |
130 | |
131 | /* |
132 | * Returns a pointer to the first byte of the CPL header in an sk_buff that |
133 | * contains a CPL message. |
134 | */ |
135 | static inline void *cplhdr(struct sk_buff *skb) |
136 | { |
137 | return skb->data; |
138 | } |
139 | |
140 | void t3_register_cpl_handler(unsigned int opcode, cpl_handler_func h); |
141 | |
142 | union listen_entry { |
143 | struct t3c_tid_entry t3c_tid; |
144 | union listen_entry *next; |
145 | }; |
146 | |
147 | union active_open_entry { |
148 | struct t3c_tid_entry t3c_tid; |
149 | union active_open_entry *next; |
150 | }; |
151 | |
152 | /* |
153 | * Holds the size, base address, free list start, etc of the TID, server TID, |
154 | * and active-open TID tables for a offload device. |
155 | * The tables themselves are allocated dynamically. |
156 | */ |
157 | struct tid_info { |
158 | struct t3c_tid_entry *tid_tab; |
159 | unsigned int ntids; |
160 | atomic_t tids_in_use; |
161 | |
162 | union listen_entry *stid_tab; |
163 | unsigned int nstids; |
164 | unsigned int stid_base; |
165 | |
166 | union active_open_entry *atid_tab; |
167 | unsigned int natids; |
168 | unsigned int atid_base; |
169 | |
170 | /* |
171 | * The following members are accessed R/W so we put them in their own |
172 | * cache lines. |
173 | * |
174 | * XXX We could combine the atid fields above with the lock here since |
175 | * atids are use once (unlike other tids). OTOH the above fields are |
176 | * usually in cache due to tid_tab. |
177 | */ |
178 | spinlock_t atid_lock ____cacheline_aligned_in_smp; |
179 | union active_open_entry *afree; |
180 | unsigned int atids_in_use; |
181 | |
182 | spinlock_t stid_lock ____cacheline_aligned; |
183 | union listen_entry *sfree; |
184 | unsigned int stids_in_use; |
185 | }; |
186 | |
187 | struct t3c_data { |
188 | struct list_head list_node; |
189 | struct t3cdev *dev; |
190 | unsigned int tx_max_chunk; /* max payload for TX_DATA */ |
191 | unsigned int max_wrs; /* max in-flight WRs per connection */ |
192 | unsigned int nmtus; |
193 | const unsigned short *mtus; |
194 | struct tid_info tid_maps; |
195 | |
196 | struct t3c_tid_entry *tid_release_list; |
197 | spinlock_t tid_release_lock; |
198 | struct work_struct tid_release_task; |
199 | |
200 | struct sk_buff *nofail_skb; |
201 | unsigned int release_list_incomplete; |
202 | }; |
203 | |
204 | /* |
205 | * t3cdev -> t3c_data accessor |
206 | */ |
207 | #define T3C_DATA(dev) (*(struct t3c_data **)&(dev)->l4opt) |
208 | |
209 | #endif |
210 | |