The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/cxgb/cxgb_offload.h

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    1 
    2 /**************************************************************************
    3 
    4 Copyright (c) 2007-2008, 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: releng/8.0/sys/dev/cxgb/cxgb_offload.h 183321 2008-09-24 01:19:08Z kmacy $
   30 
   31 ***************************************************************************/
   32 
   33 #ifndef _CXGB_OFFLOAD_H
   34 #define _CXGB_OFFLOAD_H
   35 
   36 #include <common/cxgb_version.h>
   37 #include <cxgb_config.h>
   38 #include <common/cxgb_tcb.h>
   39 #include <t3cdev.h>
   40 
   41 MALLOC_DECLARE(M_CXGB);
   42 
   43 struct adapter;
   44 struct cxgb_client;
   45 
   46 void cxgb_offload_init(void);
   47 void cxgb_offload_exit(void);
   48 
   49 void cxgb_adapter_ofld(struct adapter *adapter);
   50 void cxgb_adapter_unofld(struct adapter *adapter);
   51 int cxgb_offload_activate(struct adapter *adapter);
   52 void cxgb_offload_deactivate(struct adapter *adapter);
   53 int cxgb_ofld_recv(struct t3cdev *dev, struct mbuf **m, int n);
   54 
   55 void cxgb_set_dummy_ops(struct t3cdev *dev);
   56 
   57 
   58 /*
   59  * Client registration.  Users of T3 driver must register themselves.
   60  * The T3 driver will call the add function of every client for each T3
   61  * adapter activated, passing up the t3cdev ptr.  Each client fills out an
   62  * array of callback functions to process CPL messages.
   63  */
   64 
   65 void cxgb_register_client(struct cxgb_client *client);
   66 void cxgb_unregister_client(struct cxgb_client *client);
   67 void cxgb_add_clients(struct t3cdev *tdev);
   68 void cxgb_remove_clients(struct t3cdev *tdev);
   69 
   70 typedef int (*cxgb_cpl_handler_func)(struct t3cdev *dev,
   71                                       struct mbuf *m, void *ctx);
   72 
   73 struct l2t_entry;
   74 struct cxgb_client {
   75         char                    *name;
   76         void                    (*add) (struct t3cdev *);
   77         void                    (*remove) (struct t3cdev *);
   78         cxgb_cpl_handler_func   *handlers;
   79         int                     (*redirect)(void *ctx, struct rtentry *old,
   80                                             struct rtentry *new,
   81                                             struct l2t_entry *l2t);
   82         TAILQ_ENTRY(cxgb_client)         client_entry;
   83 };
   84 
   85 /*
   86  * TID allocation services.
   87  */
   88 int cxgb_alloc_atid(struct t3cdev *dev, struct cxgb_client *client,
   89                      void *ctx);
   90 int cxgb_alloc_stid(struct t3cdev *dev, struct cxgb_client *client,
   91                      void *ctx);
   92 void *cxgb_free_atid(struct t3cdev *dev, int atid);
   93 void cxgb_free_stid(struct t3cdev *dev, int stid);
   94 void *cxgb_get_lctx(struct t3cdev *tdev, int stid);
   95 void cxgb_insert_tid(struct t3cdev *dev, struct cxgb_client *client,
   96                       void *ctx,
   97         unsigned int tid);
   98 void cxgb_queue_tid_release(struct t3cdev *dev, unsigned int tid);
   99 void cxgb_remove_tid(struct t3cdev *dev, void *ctx, unsigned int tid);
  100 
  101 struct toe_tid_entry {
  102         struct cxgb_client      *client;
  103         void                    *ctx;
  104 };
  105 
  106 /* CPL message priority levels */
  107 enum {
  108         CPL_PRIORITY_DATA = 0,     /* data messages */
  109         CPL_PRIORITY_SETUP = 1,    /* connection setup messages */
  110         CPL_PRIORITY_TEARDOWN = 0, /* connection teardown messages */
  111         CPL_PRIORITY_LISTEN = 1,   /* listen start/stop messages */
  112         CPL_PRIORITY_ACK = 1,      /* RX ACK messages */
  113         CPL_PRIORITY_CONTROL = 1   /* offload control messages */
  114 };
  115 
  116 /* Flags for return value of CPL message handlers */
  117 enum {
  118         CPL_RET_BUF_DONE = 1,   // buffer processing done, buffer may be freed
  119         CPL_RET_BAD_MSG = 2,    // bad CPL message (e.g., unknown opcode)
  120         CPL_RET_UNKNOWN_TID = 4 // unexpected unknown TID
  121 };
  122 
  123 typedef int (*cpl_handler_func)(struct t3cdev *dev, struct mbuf *m);
  124 
  125 /*
  126  * Returns a pointer to the first byte of the CPL header in an sk_buff that
  127  * contains a CPL message.
  128  */
  129 static inline void *cplhdr(struct mbuf *m)
  130 {
  131         return mtod(m, uint8_t *);
  132 }
  133 
  134 void t3_register_cpl_handler(unsigned int opcode, cpl_handler_func h);
  135 
  136 union listen_entry {
  137         struct toe_tid_entry toe_tid;
  138         union listen_entry *next;
  139 };
  140 
  141 union active_open_entry {
  142         struct toe_tid_entry toe_tid;
  143         union active_open_entry *next;
  144 };
  145 
  146 /*
  147  * Holds the size, base address, free list start, etc of the TID, server TID,
  148  * and active-open TID tables for a offload device.
  149  * The tables themselves are allocated dynamically.
  150  */
  151 struct tid_info {
  152         struct toe_tid_entry *tid_tab;
  153         unsigned int ntids;
  154         volatile unsigned int tids_in_use;
  155 
  156         union listen_entry *stid_tab;
  157         unsigned int nstids;
  158         unsigned int stid_base;
  159 
  160         union active_open_entry *atid_tab;
  161         unsigned int natids;
  162         unsigned int atid_base;
  163 
  164         /*
  165          * The following members are accessed R/W so we put them in their own
  166          * cache lines.
  167          *
  168          * XXX We could combine the atid fields above with the lock here since
  169          * atids are use once (unlike other tids).  OTOH the above fields are
  170          * usually in cache due to tid_tab.
  171          */
  172         struct mtx atid_lock /* ____cacheline_aligned_in_smp */;
  173         union active_open_entry *afree;
  174         unsigned int atids_in_use;
  175 
  176         struct mtx stid_lock /*____cacheline_aligned */;
  177         union listen_entry *sfree;
  178         unsigned int stids_in_use;
  179 };
  180 
  181 struct t3c_data {
  182         struct t3cdev *dev;
  183         unsigned int tx_max_chunk;  /* max payload for TX_DATA */
  184         unsigned int max_wrs;       /* max in-flight WRs per connection */
  185         unsigned int nmtus;
  186         const unsigned short *mtus;
  187         struct tid_info tid_maps;
  188 
  189         struct toe_tid_entry *tid_release_list;
  190         struct mtx tid_release_lock;
  191         struct task tid_release_task;
  192 };
  193 
  194 /*
  195  * t3cdev -> toe_data accessor
  196  */
  197 #define T3C_DATA(dev) (*(struct t3c_data **)&(dev)->l4opt)
  198 
  199 /*
  200  * Map an ATID or STID to their entries in the corresponding TID tables.
  201  */
  202 static inline union active_open_entry *atid2entry(const struct tid_info *t,
  203                                                   unsigned int atid)
  204 {
  205         return &t->atid_tab[atid - t->atid_base];
  206 }
  207 
  208 
  209 static inline union listen_entry *stid2entry(const struct tid_info *t,
  210                                              unsigned int stid)
  211 {
  212         return &t->stid_tab[stid - t->stid_base];
  213 }
  214 
  215 /*
  216  * Find the connection corresponding to a TID.
  217  */
  218 static inline struct toe_tid_entry *lookup_tid(const struct tid_info *t,
  219                                                unsigned int tid)
  220 {
  221         return tid < t->ntids ? &(t->tid_tab[tid]) : NULL;
  222 }
  223 
  224 /*
  225  * Find the connection corresponding to a server TID.
  226  */
  227 static inline struct toe_tid_entry *lookup_stid(const struct tid_info *t,
  228                                                 unsigned int tid)
  229 {
  230         if (tid < t->stid_base || tid >= t->stid_base + t->nstids)
  231                 return NULL;
  232         return &(stid2entry(t, tid)->toe_tid);
  233 }
  234 
  235 /*
  236  * Find the connection corresponding to an active-open TID.
  237  */
  238 static inline struct toe_tid_entry *lookup_atid(const struct tid_info *t,
  239                                                 unsigned int tid)
  240 {
  241         if (tid < t->atid_base || tid >= t->atid_base + t->natids)
  242                 return NULL;
  243         return &(atid2entry(t, tid)->toe_tid);
  244 }
  245 
  246 void *cxgb_alloc_mem(unsigned long size);
  247 void cxgb_free_mem(void *addr);
  248 void cxgb_neigh_update(struct rtentry *rt, uint8_t *enaddr, struct sockaddr *sa);
  249 void cxgb_redirect(struct rtentry *old, struct rtentry *new, struct sockaddr *sa);
  250 int process_rx(struct t3cdev *dev, struct mbuf **m, int n);
  251 int attach_t3cdev(struct t3cdev *dev);
  252 void detach_t3cdev(struct t3cdev *dev);
  253 
  254 #define CXGB_UNIMPLEMENTED() panic("IMPLEMENT: %s:%s:%d", __FUNCTION__, __FILE__, __LINE__)
  255 #endif

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