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