1
2 /**************************************************************************
3
4 Copyright (c) 2007, Chelsio Inc.
5 All rights reserved.
6
7 Redistribution and use in source and binary forms, with or without
8 modification, are permitted provided that the following conditions are met:
9
10 1. Redistributions of source code must retain the above copyright notice,
11 this list of conditions and the following disclaimer.
12
13 2. Neither the name of the Chelsio Corporation nor the names of its
14 contributors may be used to endorse or promote products derived from
15 this software without specific prior written permission.
16
17 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18 AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
21 LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 POSSIBILITY OF SUCH DAMAGE.
28
29 $FreeBSD$
30
31 ***************************************************************************/
32
33 #ifndef _CXGB_OFFLOAD_H
34 #define _CXGB_OFFLOAD_H
35
36 #ifdef CONFIG_DEFINED
37 #include <common/cxgb_version.h>
38 #include <cxgb_config.h>
39 #include <cxgb_l2t.h>
40 #include <common/cxgb_tcb.h>
41 #else
42 #include <dev/cxgb/common/cxgb_version.h>
43 #include <dev/cxgb/cxgb_config.h>
44 #include <dev/cxgb/cxgb_l2t.h>
45 #include <dev/cxgb/common/cxgb_tcb.h>
46 #endif
47
48 struct adapter;
49 struct cxgb_client;
50
51 void cxgb_offload_init(void);
52 void cxgb_offload_exit(void);
53
54 void cxgb_adapter_ofld(struct adapter *adapter);
55 void cxgb_adapter_unofld(struct adapter *adapter);
56 int cxgb_offload_activate(struct adapter *adapter);
57 void cxgb_offload_deactivate(struct adapter *adapter);
58 int cxgb_ofld_recv(struct toedev *dev, struct mbuf **m, int n);
59
60 void cxgb_set_dummy_ops(struct toedev *dev);
61
62
63 /*
64 * Client registration. Users of T3 driver must register themselves.
65 * The T3 driver will call the add function of every client for each T3
66 * adapter activated, passing up the toedev ptr. Each client fills out an
67 * array of callback functions to process CPL messages.
68 */
69
70 void cxgb_register_client(struct cxgb_client *client);
71 void cxgb_unregister_client(struct cxgb_client *client);
72 void cxgb_add_clients(struct toedev *tdev);
73 void cxgb_remove_clients(struct toedev *tdev);
74
75 typedef int (*cxgb_cpl_handler_func)(struct toedev *dev,
76 struct mbuf *m, void *ctx);
77
78 struct cxgb_client {
79 char *name;
80 void (*add) (struct toedev *);
81 void (*remove) (struct toedev *);
82 cxgb_cpl_handler_func *handlers;
83 int (*redirect)(void *ctx, struct rtentry *old,
84 struct rtentry *new,
85 struct l2t_entry *l2t);
86 TAILQ_ENTRY(cxgb_client) client_entry;
87 };
88
89 /*
90 * TID allocation services.
91 */
92 int cxgb_alloc_atid(struct toedev *dev, struct cxgb_client *client,
93 void *ctx);
94 int cxgb_alloc_stid(struct toedev *dev, struct cxgb_client *client,
95 void *ctx);
96 void *cxgb_free_atid(struct toedev *dev, int atid);
97 void cxgb_free_stid(struct toedev *dev, int stid);
98 void cxgb_insert_tid(struct toedev *dev, struct cxgb_client *client,
99 void *ctx,
100 unsigned int tid);
101 void cxgb_queue_tid_release(struct toedev *dev, unsigned int tid);
102 void cxgb_remove_tid(struct toedev *dev, void *ctx, unsigned int tid);
103
104 struct toe_tid_entry {
105 struct cxgb_client *client;
106 void *ctx;
107 };
108
109 /* CPL message priority levels */
110 enum {
111 CPL_PRIORITY_DATA = 0, /* data messages */
112 CPL_PRIORITY_SETUP = 1, /* connection setup messages */
113 CPL_PRIORITY_TEARDOWN = 0, /* connection teardown messages */
114 CPL_PRIORITY_LISTEN = 1, /* listen start/stop messages */
115 CPL_PRIORITY_ACK = 1, /* RX ACK messages */
116 CPL_PRIORITY_CONTROL = 1 /* offload control messages */
117 };
118
119 /* Flags for return value of CPL message handlers */
120 enum {
121 CPL_RET_BUF_DONE = 1, // buffer processing done, buffer may be freed
122 CPL_RET_BAD_MSG = 2, // bad CPL message (e.g., unknown opcode)
123 CPL_RET_UNKNOWN_TID = 4 // unexpected unknown TID
124 };
125
126 typedef int (*cpl_handler_func)(struct toedev *dev, struct mbuf *m);
127
128 /*
129 * Returns a pointer to the first byte of the CPL header in an sk_buff that
130 * contains a CPL message.
131 */
132 static inline void *cplhdr(struct mbuf *m)
133 {
134 return mtod(m, uint8_t *);
135 }
136
137 void t3_register_cpl_handler(unsigned int opcode, cpl_handler_func h);
138
139 union listen_entry {
140 struct toe_tid_entry toe_tid;
141 union listen_entry *next;
142 };
143
144 union active_open_entry {
145 struct toe_tid_entry toe_tid;
146 union active_open_entry *next;
147 };
148
149 /*
150 * Holds the size, base address, free list start, etc of the TID, server TID,
151 * and active-open TID tables for a offload device.
152 * The tables themselves are allocated dynamically.
153 */
154 struct tid_info {
155 struct toe_tid_entry *tid_tab;
156 unsigned int ntids;
157 volatile unsigned int tids_in_use;
158
159 union listen_entry *stid_tab;
160 unsigned int nstids;
161 unsigned int stid_base;
162
163 union active_open_entry *atid_tab;
164 unsigned int natids;
165 unsigned int atid_base;
166
167 /*
168 * The following members are accessed R/W so we put them in their own
169 * cache lines.
170 *
171 * XXX We could combine the atid fields above with the lock here since
172 * atids are use once (unlike other tids). OTOH the above fields are
173 * usually in cache due to tid_tab.
174 */
175 struct mtx atid_lock /* ____cacheline_aligned_in_smp */;
176 union active_open_entry *afree;
177 unsigned int atids_in_use;
178
179 struct mtx stid_lock /*____cacheline_aligned */;
180 union listen_entry *sfree;
181 unsigned int stids_in_use;
182 };
183
184 struct toe_data {
185 #ifdef notyet
186 struct list_head list_node;
187 #endif
188 struct toedev *dev;
189 unsigned int tx_max_chunk; /* max payload for TX_DATA */
190 unsigned int max_wrs; /* max in-flight WRs per connection */
191 unsigned int nmtus;
192 const unsigned short *mtus;
193 struct tid_info tid_maps;
194
195 struct toe_tid_entry *tid_release_list;
196 struct mtx tid_release_lock;
197 struct task tid_release_task;
198 };
199
200 /*
201 * toedev -> toe_data accessor
202 */
203 #define TOE_DATA(dev) (*(struct toe_data **)&(dev)->l4opt)
204
205 /*
206 * Map an ATID or STID to their entries in the corresponding TID tables.
207 */
208 static inline union active_open_entry *atid2entry(const struct tid_info *t,
209 unsigned int atid)
210 {
211 return &t->atid_tab[atid - t->atid_base];
212 }
213
214
215 static inline union listen_entry *stid2entry(const struct tid_info *t,
216 unsigned int stid)
217 {
218 return &t->stid_tab[stid - t->stid_base];
219 }
220
221 /*
222 * Find the connection corresponding to a TID.
223 */
224 static inline struct toe_tid_entry *lookup_tid(const struct tid_info *t,
225 unsigned int tid)
226 {
227 return tid < t->ntids ? &(t->tid_tab[tid]) : NULL;
228 }
229
230 /*
231 * Find the connection corresponding to a server TID.
232 */
233 static inline struct toe_tid_entry *lookup_stid(const struct tid_info *t,
234 unsigned int tid)
235 {
236 if (tid < t->stid_base || tid >= t->stid_base + t->nstids)
237 return NULL;
238 return &(stid2entry(t, tid)->toe_tid);
239 }
240
241 /*
242 * Find the connection corresponding to an active-open TID.
243 */
244 static inline struct toe_tid_entry *lookup_atid(const struct tid_info *t,
245 unsigned int tid)
246 {
247 if (tid < t->atid_base || tid >= t->atid_base + t->natids)
248 return NULL;
249 return &(atid2entry(t, tid)->toe_tid);
250 }
251
252 void *cxgb_alloc_mem(unsigned long size);
253 void cxgb_free_mem(void *addr);
254 void cxgb_neigh_update(struct rtentry *rt);
255 void cxgb_redirect(struct rtentry *old, struct rtentry *new);
256 int process_rx(struct toedev *dev, struct mbuf **m, int n);
257 int attach_toedev(struct toedev *dev);
258 void detach_toedev(struct toedev *dev);
259
260
261 #endif
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