1 /*
2 * cxgb3i_offload.h: Chelsio S3xx iscsi offloaded tcp connection management
3 *
4 * Copyright (C) 2003-2008 Chelsio Communications. All rights reserved.
5 *
6 * This program is distributed in the hope that it will be useful, but WITHOUT
7 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
8 * FITNESS FOR A PARTICULAR PURPOSE. See the LICENSE file included in this
9 * release for licensing terms and conditions.
10 *
11 * Written by: Dimitris Michailidis (dm@chelsio.com)
12 * Karen Xie (kxie@chelsio.com)
13 */
14
15 #ifndef _CXGB3I_OFFLOAD_H
16 #define _CXGB3I_OFFLOAD_H
17
18 #include <linux/skbuff.h>
19 #include <net/tcp.h>
20
21 #include "common.h"
22 #include "adapter.h"
23 #include "t3cdev.h"
24 #include "cxgb3_offload.h"
25
26 #define cxgb3i_log_error(fmt...) printk(KERN_ERR "cxgb3i: ERR! " fmt)
27 #define cxgb3i_log_warn(fmt...) printk(KERN_WARNING "cxgb3i: WARN! " fmt)
28 #define cxgb3i_log_info(fmt...) printk(KERN_INFO "cxgb3i: " fmt)
29 #define cxgb3i_log_debug(fmt, args...) \
30 printk(KERN_INFO "cxgb3i: %s - " fmt, __func__ , ## args)
31
32 /**
33 * struct s3_conn - an iscsi tcp connection structure
34 *
35 * @dev: net device of with connection
36 * @cdev: adapter t3cdev for net device
37 * @flags: see c3cn_flags below
38 * @tid: connection id assigned by the h/w
39 * @qset: queue set used by connection
40 * @mss_idx: Maximum Segment Size table index
41 * @l2t: ARP resolution entry for offload packets
42 * @wr_max: maximum in-flight writes
43 * @wr_avail: number of writes available
44 * @wr_unacked: writes since last request for completion notification
45 * @wr_pending_head: head of pending write queue
46 * @wr_pending_tail: tail of pending write queue
47 * @cpl_close: skb for cpl_close_req
48 * @cpl_abort_req: skb for cpl_abort_req
49 * @cpl_abort_rpl: skb for cpl_abort_rpl
50 * @lock: connection status lock
51 * @refcnt: reference count on connection
52 * @state: connection state
53 * @saddr: source ip/port address
54 * @daddr: destination ip/port address
55 * @dst_cache: reference to destination route
56 * @receive_queue: received PDUs
57 * @write_queue: un-pushed pending writes
58 * @retry_timer: retry timer for various operations
59 * @err: connection error status
60 * @callback_lock: lock for opaque user context
61 * @user_data: opaque user context
62 * @rcv_nxt: next receive seq. #
63 * @copied_seq: head of yet unread data
64 * @rcv_wup: rcv_nxt on last window update sent
65 * @snd_nxt: next sequence we send
66 * @snd_una: first byte we want an ack for
67 * @write_seq: tail+1 of data held in send buffer
68 */
69 struct s3_conn {
70 struct net_device *dev;
71 struct t3cdev *cdev;
72 unsigned long flags;
73 int tid;
74 int qset;
75 int mss_idx;
76 struct l2t_entry *l2t;
77 int wr_max;
78 int wr_avail;
79 int wr_unacked;
80 struct sk_buff *wr_pending_head;
81 struct sk_buff *wr_pending_tail;
82 struct sk_buff *cpl_close;
83 struct sk_buff *cpl_abort_req;
84 struct sk_buff *cpl_abort_rpl;
85 spinlock_t lock;
86 atomic_t refcnt;
87 volatile unsigned int state;
88 struct sockaddr_in saddr;
89 struct sockaddr_in daddr;
90 struct dst_entry *dst_cache;
91 struct sk_buff_head receive_queue;
92 struct sk_buff_head write_queue;
93 struct timer_list retry_timer;
94 int err;
95 rwlock_t callback_lock;
96 void *user_data;
97
98 u32 rcv_nxt;
99 u32 copied_seq;
100 u32 rcv_wup;
101 u32 snd_nxt;
102 u32 snd_una;
103 u32 write_seq;
104 };
105
106 /*
107 * connection state
108 */
109 enum conn_states {
110 C3CN_STATE_CONNECTING = 1,
111 C3CN_STATE_ESTABLISHED,
112 C3CN_STATE_ACTIVE_CLOSE,
113 C3CN_STATE_PASSIVE_CLOSE,
114 C3CN_STATE_CLOSE_WAIT_1,
115 C3CN_STATE_CLOSE_WAIT_2,
116 C3CN_STATE_ABORTING,
117 C3CN_STATE_CLOSED,
118 };
119
c3cn_is_closing(const struct s3_conn * c3cn)120 static inline unsigned int c3cn_is_closing(const struct s3_conn *c3cn)
121 {
122 return c3cn->state >= C3CN_STATE_ACTIVE_CLOSE;
123 }
c3cn_is_established(const struct s3_conn * c3cn)124 static inline unsigned int c3cn_is_established(const struct s3_conn *c3cn)
125 {
126 return c3cn->state == C3CN_STATE_ESTABLISHED;
127 }
128
129 /*
130 * Connection flags -- many to track some close related events.
131 */
132 enum c3cn_flags {
133 C3CN_ABORT_RPL_RCVD, /* received one ABORT_RPL_RSS message */
134 C3CN_ABORT_REQ_RCVD, /* received one ABORT_REQ_RSS message */
135 C3CN_ABORT_RPL_PENDING, /* expecting an abort reply */
136 C3CN_TX_DATA_SENT, /* already sent a TX_DATA WR */
137 C3CN_ACTIVE_CLOSE_NEEDED, /* need to be closed */
138 };
139
140 /**
141 * cxgb3i_sdev_data - Per adapter data.
142 * Linked off of each Ethernet device port on the adapter.
143 * Also available via the t3cdev structure since we have pointers to our port
144 * net_device's there ...
145 *
146 * @list: list head to link elements
147 * @cdev: t3cdev adapter
148 * @client: CPL client pointer
149 * @ports: array of adapter ports
150 * @sport_map_next: next index into the port map
151 * @sport_map: source port map
152 */
153 struct cxgb3i_sdev_data {
154 struct list_head list;
155 struct t3cdev *cdev;
156 struct cxgb3_client *client;
157 struct adap_ports ports;
158 unsigned int sport_map_next;
159 unsigned long sport_map[0];
160 };
161 #define NDEV2CDATA(ndev) (*(struct cxgb3i_sdev_data **)&(ndev)->ec_ptr)
162 #define CXGB3_SDEV_DATA(cdev) NDEV2CDATA((cdev)->lldev)
163
164 void cxgb3i_sdev_cleanup(void);
165 int cxgb3i_sdev_init(cxgb3_cpl_handler_func *);
166 void cxgb3i_sdev_add(struct t3cdev *, struct cxgb3_client *);
167 void cxgb3i_sdev_remove(struct t3cdev *);
168
169 struct s3_conn *cxgb3i_c3cn_create(void);
170 int cxgb3i_c3cn_connect(struct s3_conn *, struct sockaddr_in *);
171 void cxgb3i_c3cn_rx_credits(struct s3_conn *, int);
172 int cxgb3i_c3cn_send_pdus(struct s3_conn *, struct sk_buff *);
173 void cxgb3i_c3cn_release(struct s3_conn *);
174
175 /**
176 * cxgb3_skb_cb - control block for received pdu state and ULP mode management.
177 *
178 * @flag: see C3CB_FLAG_* below
179 * @ulp_mode: ULP mode/submode of sk_buff
180 * @seq: tcp sequence number
181 */
182 struct cxgb3_skb_rx_cb {
183 __u32 ddigest; /* data digest */
184 __u32 pdulen; /* recovered pdu length */
185 };
186
187 struct cxgb3_skb_tx_cb {
188 struct sk_buff *wr_next; /* next wr */
189 };
190
191 struct cxgb3_skb_cb {
192 __u8 flags;
193 __u8 ulp_mode;
194 __u32 seq;
195 union {
196 struct cxgb3_skb_rx_cb rx;
197 struct cxgb3_skb_tx_cb tx;
198 };
199 };
200
201 #define CXGB3_SKB_CB(skb) ((struct cxgb3_skb_cb *)&((skb)->cb[0]))
202 #define skb_flags(skb) (CXGB3_SKB_CB(skb)->flags)
203 #define skb_ulp_mode(skb) (CXGB3_SKB_CB(skb)->ulp_mode)
204 #define skb_tcp_seq(skb) (CXGB3_SKB_CB(skb)->seq)
205 #define skb_rx_ddigest(skb) (CXGB3_SKB_CB(skb)->rx.ddigest)
206 #define skb_rx_pdulen(skb) (CXGB3_SKB_CB(skb)->rx.pdulen)
207 #define skb_tx_wr_next(skb) (CXGB3_SKB_CB(skb)->tx.wr_next)
208
209 enum c3cb_flags {
210 C3CB_FLAG_NEED_HDR = 1 << 0, /* packet needs a TX_DATA_WR header */
211 C3CB_FLAG_NO_APPEND = 1 << 1, /* don't grow this skb */
212 C3CB_FLAG_COMPL = 1 << 2, /* request WR completion */
213 };
214
215 /**
216 * sge_opaque_hdr -
217 * Opaque version of structure the SGE stores at skb->head of TX_DATA packets
218 * and for which we must reserve space.
219 */
220 struct sge_opaque_hdr {
221 void *dev;
222 dma_addr_t addr[MAX_SKB_FRAGS + 1];
223 };
224
225 /* for TX: a skb must have a headroom of at least TX_HEADER_LEN bytes */
226 #define TX_HEADER_LEN \
227 (sizeof(struct tx_data_wr) + sizeof(struct sge_opaque_hdr))
228 #define SKB_TX_HEADROOM SKB_MAX_HEAD(TX_HEADER_LEN)
229
230 /*
231 * get and set private ip for iscsi traffic
232 */
233 #define cxgb3i_get_private_ipv4addr(ndev) \
234 (((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr)
235 #define cxgb3i_set_private_ipv4addr(ndev, addr) \
236 (((struct port_info *)(netdev_priv(ndev)))->iscsi_ipv4addr) = addr
237
238 /* max. connections per adapter */
239 #define CXGB3I_MAX_CONN 16384
240 #endif /* _CXGB3_OFFLOAD_H */
241