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
 43struct adapter;
 44
 45void cxgb3_offload_init(void);
 46
 47void cxgb3_adapter_ofld(struct adapter *adapter);
 48void cxgb3_adapter_unofld(struct adapter *adapter);
 49int cxgb3_offload_activate(struct adapter *adapter);
 50void cxgb3_offload_deactivate(struct adapter *adapter);
 51
 52void cxgb3_set_dummy_ops(struct t3cdev *dev);
 53
 54struct 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
 63void cxgb3_register_client(struct cxgb3_client *client);
 64void cxgb3_unregister_client(struct cxgb3_client *client);
 65void cxgb3_add_clients(struct t3cdev *tdev);
 66void cxgb3_remove_clients(struct t3cdev *tdev);
 67void cxgb3_event_notify(struct t3cdev *tdev, u32 event, u32 port);
 68
 69typedef int (*cxgb3_cpl_handler_func)(struct t3cdev *dev,
 70				      struct sk_buff *skb, void *ctx);
 71
 72enum {
 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
 82struct 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 */
 96int cxgb3_alloc_atid(struct t3cdev *dev, struct cxgb3_client *client,
 97		     void *ctx);
 98void *cxgb3_free_atid(struct t3cdev *dev, int atid);
 99void cxgb3_insert_tid(struct t3cdev *dev, struct cxgb3_client *client,
100		      void *ctx, unsigned int tid);
101void cxgb3_queue_tid_release(struct t3cdev *dev, unsigned int tid);
102void cxgb3_remove_tid(struct t3cdev *dev, void *ctx, unsigned int tid);
103
104struct t3c_tid_entry {
105	struct cxgb3_client *client;
106	void *ctx;
107};
108
109/* CPL message priority levels */
110enum {
111	CPL_PRIORITY_DATA = 0,	/* data messages */
112	CPL_PRIORITY_SETUP = 1,	/* connection setup messages */
113	CPL_PRIORITY_TEARDOWN = 0,	/* connection teardown messages */
114	CPL_PRIORITY_LISTEN = 1,	/* listen start/stop messages */
115	CPL_PRIORITY_ACK = 1,	/* RX ACK messages */
116	CPL_PRIORITY_CONTROL = 1	/* offload control messages */
117};
118
119/* Flags for return value of CPL message handlers */
120enum {
121	CPL_RET_BUF_DONE = 1, /* buffer processing done, buffer may be freed */
122	CPL_RET_BAD_MSG = 2,  /* bad CPL message (e.g., unknown opcode) */
123	CPL_RET_UNKNOWN_TID = 4	/* unexpected unknown TID */
124};
125
126typedef int (*cpl_handler_func)(struct t3cdev *dev, struct sk_buff *skb);
127
128/*
129 * Returns a pointer to the first byte of the CPL header in an sk_buff that
130 * contains a CPL message.
131 */
132static inline void *cplhdr(struct sk_buff *skb)
133{
134	return skb->data;
135}
136
137void t3_register_cpl_handler(unsigned int opcode, cpl_handler_func h);
138
139union listen_entry {
140	struct t3c_tid_entry t3c_tid;
141	union listen_entry *next;
142};
143
144union active_open_entry {
145	struct t3c_tid_entry t3c_tid;
146	union active_open_entry *next;
147};
148
149/*
150 * Holds the size, base address, free list start, etc of the TID, server TID,
151 * and active-open TID tables for a offload device.
152 * The tables themselves are allocated dynamically.
153 */
154struct tid_info {
155	struct t3c_tid_entry *tid_tab;
156	unsigned int ntids;
157	atomic_t tids_in_use;
158
159	union listen_entry *stid_tab;
160	unsigned int nstids;
161	unsigned int stid_base;
162
163	union active_open_entry *atid_tab;
164	unsigned int natids;
165	unsigned int atid_base;
166
167	/*
168	 * The following members are accessed R/W so we put them in their own
169	 * cache lines.
170	 *
171	 * XXX We could combine the atid fields above with the lock here since
172	 * atids are use once (unlike other tids).  OTOH the above fields are
173	 * usually in cache due to tid_tab.
174	 */
175	spinlock_t atid_lock ____cacheline_aligned_in_smp;
176	union active_open_entry *afree;
177	unsigned int atids_in_use;
178
179	spinlock_t stid_lock ____cacheline_aligned;
180	union listen_entry *sfree;
181	unsigned int stids_in_use;
182};
183
184struct t3c_data {
185	struct list_head list_node;
186	struct t3cdev *dev;
187	unsigned int tx_max_chunk;	/* max payload for TX_DATA */
188	unsigned int max_wrs;	/* max in-flight WRs per connection */
189	unsigned int nmtus;
190	const unsigned short *mtus;
191	struct tid_info tid_maps;
192
193	struct t3c_tid_entry *tid_release_list;
194	spinlock_t tid_release_lock;
195	struct work_struct tid_release_task;
196
197	struct sk_buff *nofail_skb;
198	unsigned int release_list_incomplete;
199};
200
201/*
202 * t3cdev -> t3c_data accessor
203 */
204#define T3C_DATA(dev) (*(struct t3c_data **)&(dev)->l4opt)
205
206#endif