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_err_notify(struct t3cdev *tdev, u32 status, u32 error);
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 };
76
77 struct cxgb3_client {
78 char *name;
79 void (*add) (struct t3cdev *);
80 void (*remove) (struct t3cdev *);
81 cxgb3_cpl_handler_func *handlers;
82 int (*redirect)(void *ctx, struct dst_entry *old,
83 struct dst_entry *new, struct l2t_entry *l2t);
84 struct list_head client_list;
85 void (*err_handler)(struct t3cdev *tdev, u32 status, u32 error);
86 };
87
88 /*
89 * TID allocation services.
90 */
91 int cxgb3_alloc_atid(struct t3cdev *dev, struct cxgb3_client *client,
92 void *ctx);
93 int cxgb3_alloc_stid(struct t3cdev *dev, struct cxgb3_client *client,
94 void *ctx);
95 void *cxgb3_free_atid(struct t3cdev *dev, int atid);
96 void cxgb3_free_stid(struct t3cdev *dev, int stid);
97 void cxgb3_insert_tid(struct t3cdev *dev, struct cxgb3_client *client,
98 void *ctx, unsigned int tid);
99 void cxgb3_queue_tid_release(struct t3cdev *dev, unsigned int tid);
100 void cxgb3_remove_tid(struct t3cdev *dev, void *ctx, unsigned int tid);
101
102 struct t3c_tid_entry {
103 struct cxgb3_client *client;
104 void *ctx;
105 };
106
107 /* CPL message priority levels */
108 enum {
109 CPL_PRIORITY_DATA = 0, /* data messages */
110 CPL_PRIORITY_SETUP = 1, /* connection setup messages */
111 CPL_PRIORITY_TEARDOWN = 0, /* connection teardown messages */
112 CPL_PRIORITY_LISTEN = 1, /* listen start/stop messages */
113 CPL_PRIORITY_ACK = 1, /* RX ACK messages */
114 CPL_PRIORITY_CONTROL = 1 /* offload control messages */
115 };
116
117 /* Flags for return value of CPL message handlers */
118 enum {
119 CPL_RET_BUF_DONE = 1, /* buffer processing done, buffer may be freed */
120 CPL_RET_BAD_MSG = 2, /* bad CPL message (e.g., unknown opcode) */
121 CPL_RET_UNKNOWN_TID = 4 /* unexpected unknown TID */
122 };
123
124 typedef int (*cpl_handler_func)(struct t3cdev *dev, struct sk_buff *skb);
125
126 /*
127 * Returns a pointer to the first byte of the CPL header in an sk_buff that
128 * contains a CPL message.
129 */
130 static inline void *cplhdr(struct sk_buff *skb)
131 {
132 return skb->data;
133 }
134
135 void t3_register_cpl_handler(unsigned int opcode, cpl_handler_func h);
136
137 union listen_entry {
138 struct t3c_tid_entry t3c_tid;
139 union listen_entry *next;
140 };
141
142 union active_open_entry {
143 struct t3c_tid_entry t3c_tid;
144 union active_open_entry *next;
145 };
146
147 /*
148 * Holds the size, base address, free list start, etc of the TID, server TID,
149 * and active-open TID tables for a offload device.
150 * The tables themselves are allocated dynamically.
151 */
152 struct tid_info {
153 struct t3c_tid_entry *tid_tab;
154 unsigned int ntids;
155 atomic_t tids_in_use;
156
157 union listen_entry *stid_tab;
158 unsigned int nstids;
159 unsigned int stid_base;
160
161 union active_open_entry *atid_tab;
162 unsigned int natids;
163 unsigned int atid_base;
164
165 /*
166 * The following members are accessed R/W so we put them in their own
167 * cache lines.
168 *
169 * XXX We could combine the atid fields above with the lock here since
170 * atids are use once (unlike other tids). OTOH the above fields are
171 * usually in cache due to tid_tab.
172 */
173 spinlock_t atid_lock ____cacheline_aligned_in_smp;
174 union active_open_entry *afree;
175 unsigned int atids_in_use;
176
177 spinlock_t stid_lock ____cacheline_aligned;
178 union listen_entry *sfree;
179 unsigned int stids_in_use;
180 };
181
182 struct t3c_data {
183 struct list_head list_node;
184 struct t3cdev *dev;
185 unsigned int tx_max_chunk; /* max payload for TX_DATA */
186 unsigned int max_wrs; /* max in-flight WRs per connection */
187 unsigned int nmtus;
188 const unsigned short *mtus;
189 struct tid_info tid_maps;
190
191 struct t3c_tid_entry *tid_release_list;
192 spinlock_t tid_release_lock;
193 struct work_struct tid_release_task;
194
195 struct sk_buff *nofail_skb;
196 unsigned int release_list_incomplete;
197 };
198
199 /*
200 * t3cdev -> t3c_data accessor
201 */
202 #define T3C_DATA(dev) (*(struct t3c_data **)&(dev)->l4opt)
203
204 #endif
205
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