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 */
cplhdr(struct sk_buff * skb)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