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
68 typedef int (*cxgb3_cpl_handler_func)(struct t3cdev *dev,
69 struct sk_buff *skb, void *ctx);
70
71 struct cxgb3_client {
72 char *name;
73 void (*add) (struct t3cdev *);
74 void (*remove) (struct t3cdev *);
75 cxgb3_cpl_handler_func *handlers;
76 int (*redirect)(void *ctx, struct dst_entry *old,
77 struct dst_entry *new, struct l2t_entry *l2t);
78 struct list_head client_list;
79 };
80
81 /*
82 * TID allocation services.
83 */
84 int cxgb3_alloc_atid(struct t3cdev *dev, struct cxgb3_client *client,
85 void *ctx);
86 int cxgb3_alloc_stid(struct t3cdev *dev, struct cxgb3_client *client,
87 void *ctx);
88 void *cxgb3_free_atid(struct t3cdev *dev, int atid);
89 void cxgb3_free_stid(struct t3cdev *dev, int stid);
90 void cxgb3_insert_tid(struct t3cdev *dev, struct cxgb3_client *client,
91 void *ctx, unsigned int tid);
92 void cxgb3_queue_tid_release(struct t3cdev *dev, unsigned int tid);
93 void cxgb3_remove_tid(struct t3cdev *dev, void *ctx, unsigned int tid);
94
95 struct t3c_tid_entry {
96 struct cxgb3_client *client;
97 void *ctx;
98 };
99
100 /* CPL message priority levels */
101 enum {
102 CPL_PRIORITY_DATA = 0, /* data messages */
103 CPL_PRIORITY_SETUP = 1, /* connection setup messages */
104 CPL_PRIORITY_TEARDOWN = 0, /* connection teardown messages */
105 CPL_PRIORITY_LISTEN = 1, /* listen start/stop messages */
106 CPL_PRIORITY_ACK = 1, /* RX ACK messages */
107 CPL_PRIORITY_CONTROL = 1 /* offload control messages */
108 };
109
110 /* Flags for return value of CPL message handlers */
111 enum {
112 CPL_RET_BUF_DONE = 1, /* buffer processing done, buffer may be freed */
113 CPL_RET_BAD_MSG = 2, /* bad CPL message (e.g., unknown opcode) */
114 CPL_RET_UNKNOWN_TID = 4 /* unexpected unknown TID */
115 };
116
117 typedef int (*cpl_handler_func)(struct t3cdev *dev, struct sk_buff *skb);
118
119 /*
120 * Returns a pointer to the first byte of the CPL header in an sk_buff that
121 * contains a CPL message.
122 */
cplhdr(struct sk_buff * skb)123 static inline void *cplhdr(struct sk_buff *skb)
124 {
125 return skb->data;
126 }
127
128 void t3_register_cpl_handler(unsigned int opcode, cpl_handler_func h);
129
130 union listen_entry {
131 struct t3c_tid_entry t3c_tid;
132 union listen_entry *next;
133 };
134
135 union active_open_entry {
136 struct t3c_tid_entry t3c_tid;
137 union active_open_entry *next;
138 };
139
140 /*
141 * Holds the size, base address, free list start, etc of the TID, server TID,
142 * and active-open TID tables for a offload device.
143 * The tables themselves are allocated dynamically.
144 */
145 struct tid_info {
146 struct t3c_tid_entry *tid_tab;
147 unsigned int ntids;
148 atomic_t tids_in_use;
149
150 union listen_entry *stid_tab;
151 unsigned int nstids;
152 unsigned int stid_base;
153
154 union active_open_entry *atid_tab;
155 unsigned int natids;
156 unsigned int atid_base;
157
158 /*
159 * The following members are accessed R/W so we put them in their own
160 * cache lines.
161 *
162 * XXX We could combine the atid fields above with the lock here since
163 * atids are use once (unlike other tids). OTOH the above fields are
164 * usually in cache due to tid_tab.
165 */
166 spinlock_t atid_lock ____cacheline_aligned_in_smp;
167 union active_open_entry *afree;
168 unsigned int atids_in_use;
169
170 spinlock_t stid_lock ____cacheline_aligned;
171 union listen_entry *sfree;
172 unsigned int stids_in_use;
173 };
174
175 struct t3c_data {
176 struct list_head list_node;
177 struct t3cdev *dev;
178 unsigned int tx_max_chunk; /* max payload for TX_DATA */
179 unsigned int max_wrs; /* max in-flight WRs per connection */
180 unsigned int nmtus;
181 const unsigned short *mtus;
182 struct tid_info tid_maps;
183
184 struct t3c_tid_entry *tid_release_list;
185 spinlock_t tid_release_lock;
186 struct work_struct tid_release_task;
187 };
188
189 /*
190 * t3cdev -> t3c_data accessor
191 */
192 #define T3C_DATA(dev) (*(struct t3c_data **)&(dev)->l4opt)
193
194 #endif
195