cxgb3_offload.h
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/*
* Copyright (c) 2006-2008 Chelsio, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#ifndef _CXGB3_OFFLOAD_H
#define _CXGB3_OFFLOAD_H
#include <linux/list.h>
#include <linux/skbuff.h>
#include "l2t.h"
#include "t3cdev.h"
#include "t3_cpl.h"
struct adapter;
void cxgb3_offload_init(void);
void cxgb3_adapter_ofld(struct adapter *adapter);
void cxgb3_adapter_unofld(struct adapter *adapter);
int cxgb3_offload_activate(struct adapter *adapter);
void cxgb3_offload_deactivate(struct adapter *adapter);
void cxgb3_set_dummy_ops(struct t3cdev *dev);
struct t3cdev *dev2t3cdev(struct net_device *dev);
/*
* Client registration. Users of T3 driver must register themselves.
* The T3 driver will call the add function of every client for each T3
* adapter activated, passing up the t3cdev ptr. Each client fills out an
* array of callback functions to process CPL messages.
*/
void cxgb3_register_client(struct cxgb3_client *client);
void cxgb3_unregister_client(struct cxgb3_client *client);
void cxgb3_add_clients(struct t3cdev *tdev);
void cxgb3_remove_clients(struct t3cdev *tdev);
void cxgb3_event_notify(struct t3cdev *tdev, u32 event, u32 port);
typedef int (*cxgb3_cpl_handler_func)(struct t3cdev *dev,
struct sk_buff *skb, void *ctx);
enum {
OFFLOAD_STATUS_UP,
OFFLOAD_STATUS_DOWN,
OFFLOAD_PORT_DOWN,
OFFLOAD_PORT_UP,
OFFLOAD_DB_FULL,
OFFLOAD_DB_EMPTY,
OFFLOAD_DB_DROP
};
struct cxgb3_client {
char *name;
void (*add) (struct t3cdev *);
void (*remove) (struct t3cdev *);
cxgb3_cpl_handler_func *handlers;
int (*redirect)(void *ctx, struct dst_entry *old,
struct dst_entry *new, struct l2t_entry *l2t);
struct list_head client_list;
void (*event_handler)(struct t3cdev *tdev, u32 event, u32 port);
};
/*
* TID allocation services.
*/
int cxgb3_alloc_atid(struct t3cdev *dev, struct cxgb3_client *client,
void *ctx);
int cxgb3_alloc_stid(struct t3cdev *dev, struct cxgb3_client *client,
void *ctx);
void *cxgb3_free_atid(struct t3cdev *dev, int atid);
void cxgb3_free_stid(struct t3cdev *dev, int stid);
void cxgb3_insert_tid(struct t3cdev *dev, struct cxgb3_client *client,
void *ctx, unsigned int tid);
void cxgb3_queue_tid_release(struct t3cdev *dev, unsigned int tid);
void cxgb3_remove_tid(struct t3cdev *dev, void *ctx, unsigned int tid);
struct t3c_tid_entry {
struct cxgb3_client *client;
void *ctx;
};
/* CPL message priority levels */
enum {
CPL_PRIORITY_DATA = 0, /* data messages */
CPL_PRIORITY_SETUP = 1, /* connection setup messages */
CPL_PRIORITY_TEARDOWN = 0, /* connection teardown messages */
CPL_PRIORITY_LISTEN = 1, /* listen start/stop messages */
CPL_PRIORITY_ACK = 1, /* RX ACK messages */
CPL_PRIORITY_CONTROL = 1 /* offload control messages */
};
/* Flags for return value of CPL message handlers */
enum {
CPL_RET_BUF_DONE = 1, /* buffer processing done, buffer may be freed */
CPL_RET_BAD_MSG = 2, /* bad CPL message (e.g., unknown opcode) */
CPL_RET_UNKNOWN_TID = 4 /* unexpected unknown TID */
};
typedef int (*cpl_handler_func)(struct t3cdev *dev, struct sk_buff *skb);
/*
* Returns a pointer to the first byte of the CPL header in an sk_buff that
* contains a CPL message.
*/
static inline void *cplhdr(struct sk_buff *skb)
{
return skb->data;
}
void t3_register_cpl_handler(unsigned int opcode, cpl_handler_func h);
union listen_entry {
struct t3c_tid_entry t3c_tid;
union listen_entry *next;
};
union active_open_entry {
struct t3c_tid_entry t3c_tid;
union active_open_entry *next;
};
/*
* Holds the size, base address, free list start, etc of the TID, server TID,
* and active-open TID tables for a offload device.
* The tables themselves are allocated dynamically.
*/
struct tid_info {
struct t3c_tid_entry *tid_tab;
unsigned int ntids;
atomic_t tids_in_use;
union listen_entry *stid_tab;
unsigned int nstids;
unsigned int stid_base;
union active_open_entry *atid_tab;
unsigned int natids;
unsigned int atid_base;
/*
* The following members are accessed R/W so we put them in their own
* cache lines.
*
* XXX We could combine the atid fields above with the lock here since
* atids are use once (unlike other tids). OTOH the above fields are
* usually in cache due to tid_tab.
*/
spinlock_t atid_lock ____cacheline_aligned_in_smp;
union active_open_entry *afree;
unsigned int atids_in_use;
spinlock_t stid_lock ____cacheline_aligned;
union listen_entry *sfree;
unsigned int stids_in_use;
};
struct t3c_data {
struct list_head list_node;
struct t3cdev *dev;
unsigned int tx_max_chunk; /* max payload for TX_DATA */
unsigned int max_wrs; /* max in-flight WRs per connection */
unsigned int nmtus;
const unsigned short *mtus;
struct tid_info tid_maps;
struct t3c_tid_entry *tid_release_list;
spinlock_t tid_release_lock;
struct work_struct tid_release_task;
struct sk_buff *nofail_skb;
unsigned int release_list_incomplete;
};
/*
* t3cdev -> t3c_data accessor
*/
#define T3C_DATA(dev) (*(struct t3c_data **)&(dev)->l4opt)
#endif