drivers/net/cxgb3/cxgb3_offload.h

   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