205 lines
6.1 KiB
C
205 lines
6.1 KiB
C
/*
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* Copyright (c) 2006-2008 Chelsio, Inc. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#ifndef _CXGB3_OFFLOAD_H
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#define _CXGB3_OFFLOAD_H
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#include <linux/list.h>
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#include <linux/skbuff.h>
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#include "l2t.h"
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#include "t3cdev.h"
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#include "t3_cpl.h"
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struct adapter;
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void cxgb3_offload_init(void);
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void cxgb3_adapter_ofld(struct adapter *adapter);
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void cxgb3_adapter_unofld(struct adapter *adapter);
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int cxgb3_offload_activate(struct adapter *adapter);
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void cxgb3_offload_deactivate(struct adapter *adapter);
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void cxgb3_set_dummy_ops(struct t3cdev *dev);
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struct t3cdev *dev2t3cdev(struct net_device *dev);
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/*
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* Client registration. Users of T3 driver must register themselves.
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* The T3 driver will call the add function of every client for each T3
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* adapter activated, passing up the t3cdev ptr. Each client fills out an
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* array of callback functions to process CPL messages.
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*/
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void cxgb3_register_client(struct cxgb3_client *client);
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void cxgb3_unregister_client(struct cxgb3_client *client);
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void cxgb3_add_clients(struct t3cdev *tdev);
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void cxgb3_remove_clients(struct t3cdev *tdev);
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void cxgb3_err_notify(struct t3cdev *tdev, u32 status, u32 error);
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typedef int (*cxgb3_cpl_handler_func)(struct t3cdev *dev,
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struct sk_buff *skb, void *ctx);
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enum {
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OFFLOAD_STATUS_UP,
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OFFLOAD_STATUS_DOWN
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};
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struct cxgb3_client {
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char *name;
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void (*add) (struct t3cdev *);
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void (*remove) (struct t3cdev *);
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cxgb3_cpl_handler_func *handlers;
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int (*redirect)(void *ctx, struct dst_entry *old,
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struct dst_entry *new, struct l2t_entry *l2t);
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struct list_head client_list;
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void (*err_handler)(struct t3cdev *tdev, u32 status, u32 error);
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};
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/*
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* TID allocation services.
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*/
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int cxgb3_alloc_atid(struct t3cdev *dev, struct cxgb3_client *client,
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void *ctx);
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int cxgb3_alloc_stid(struct t3cdev *dev, struct cxgb3_client *client,
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void *ctx);
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void *cxgb3_free_atid(struct t3cdev *dev, int atid);
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void cxgb3_free_stid(struct t3cdev *dev, int stid);
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void cxgb3_insert_tid(struct t3cdev *dev, struct cxgb3_client *client,
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void *ctx, unsigned int tid);
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void cxgb3_queue_tid_release(struct t3cdev *dev, unsigned int tid);
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void cxgb3_remove_tid(struct t3cdev *dev, void *ctx, unsigned int tid);
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struct t3c_tid_entry {
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struct cxgb3_client *client;
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void *ctx;
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};
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/* CPL message priority levels */
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enum {
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CPL_PRIORITY_DATA = 0, /* data messages */
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CPL_PRIORITY_SETUP = 1, /* connection setup messages */
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CPL_PRIORITY_TEARDOWN = 0, /* connection teardown messages */
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CPL_PRIORITY_LISTEN = 1, /* listen start/stop messages */
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CPL_PRIORITY_ACK = 1, /* RX ACK messages */
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CPL_PRIORITY_CONTROL = 1 /* offload control messages */
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};
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/* Flags for return value of CPL message handlers */
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enum {
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CPL_RET_BUF_DONE = 1, /* buffer processing done, buffer may be freed */
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CPL_RET_BAD_MSG = 2, /* bad CPL message (e.g., unknown opcode) */
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CPL_RET_UNKNOWN_TID = 4 /* unexpected unknown TID */
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};
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typedef int (*cpl_handler_func)(struct t3cdev *dev, struct sk_buff *skb);
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/*
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* Returns a pointer to the first byte of the CPL header in an sk_buff that
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* contains a CPL message.
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*/
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static inline void *cplhdr(struct sk_buff *skb)
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{
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return skb->data;
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}
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void t3_register_cpl_handler(unsigned int opcode, cpl_handler_func h);
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union listen_entry {
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struct t3c_tid_entry t3c_tid;
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union listen_entry *next;
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};
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union active_open_entry {
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struct t3c_tid_entry t3c_tid;
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union active_open_entry *next;
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};
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/*
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* Holds the size, base address, free list start, etc of the TID, server TID,
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* and active-open TID tables for a offload device.
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* The tables themselves are allocated dynamically.
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*/
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struct tid_info {
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struct t3c_tid_entry *tid_tab;
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unsigned int ntids;
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atomic_t tids_in_use;
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union listen_entry *stid_tab;
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unsigned int nstids;
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unsigned int stid_base;
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union active_open_entry *atid_tab;
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unsigned int natids;
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unsigned int atid_base;
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/*
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* The following members are accessed R/W so we put them in their own
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* cache lines.
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*
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* XXX We could combine the atid fields above with the lock here since
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* atids are use once (unlike other tids). OTOH the above fields are
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* usually in cache due to tid_tab.
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*/
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spinlock_t atid_lock ____cacheline_aligned_in_smp;
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union active_open_entry *afree;
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unsigned int atids_in_use;
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spinlock_t stid_lock ____cacheline_aligned;
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union listen_entry *sfree;
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unsigned int stids_in_use;
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};
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struct t3c_data {
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struct list_head list_node;
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struct t3cdev *dev;
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unsigned int tx_max_chunk; /* max payload for TX_DATA */
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unsigned int max_wrs; /* max in-flight WRs per connection */
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unsigned int nmtus;
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const unsigned short *mtus;
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struct tid_info tid_maps;
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struct t3c_tid_entry *tid_release_list;
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spinlock_t tid_release_lock;
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struct work_struct tid_release_task;
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struct sk_buff *nofail_skb;
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unsigned int release_list_incomplete;
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};
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/*
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* t3cdev -> t3c_data accessor
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*/
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#define T3C_DATA(dev) (*(struct t3c_data **)&(dev)->l4opt)
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#endif
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