1 /* 2 * Copyright (c) 2016 Chelsio Communications, Inc. 3 * 4 * This program is free software; you can redistribute it and/or modify 5 * it under the terms of the GNU General Public License version 2 as 6 * published by the Free Software Foundation. 7 */ 8 9 #ifndef __CXGBIT_H__ 10 #define __CXGBIT_H__ 11 12 #include <linux/mutex.h> 13 #include <linux/list.h> 14 #include <linux/spinlock.h> 15 #include <linux/idr.h> 16 #include <linux/completion.h> 17 #include <linux/netdevice.h> 18 #include <linux/sched.h> 19 #include <linux/pci.h> 20 #include <linux/dma-mapping.h> 21 #include <linux/inet.h> 22 #include <linux/wait.h> 23 #include <linux/kref.h> 24 #include <linux/timer.h> 25 #include <linux/io.h> 26 27 #include <asm/byteorder.h> 28 29 #include <net/net_namespace.h> 30 31 #include <target/iscsi/iscsi_transport.h> 32 #include <iscsi_target_parameters.h> 33 #include <iscsi_target_login.h> 34 35 #include "t4_regs.h" 36 #include "t4_msg.h" 37 #include "cxgb4.h" 38 #include "cxgb4_uld.h" 39 #include "l2t.h" 40 #include "cxgb4_ppm.h" 41 #include "cxgbit_lro.h" 42 43 extern struct mutex cdev_list_lock; 44 extern struct list_head cdev_list_head; 45 struct cxgbit_np; 46 47 struct cxgbit_sock; 48 49 struct cxgbit_cmd { 50 struct scatterlist sg; 51 struct cxgbi_task_tag_info ttinfo; 52 bool setup_ddp; 53 bool release; 54 }; 55 56 #define CXGBIT_MAX_ISO_PAYLOAD \ 57 min_t(u32, MAX_SKB_FRAGS * PAGE_SIZE, 65535) 58 59 struct cxgbit_iso_info { 60 u8 flags; 61 u32 mpdu; 62 u32 len; 63 u32 burst_len; 64 }; 65 66 enum cxgbit_skcb_flags { 67 SKCBF_TX_NEED_HDR = (1 << 0), /* packet needs a header */ 68 SKCBF_TX_FLAG_COMPL = (1 << 1), /* wr completion flag */ 69 SKCBF_TX_ISO = (1 << 2), /* iso cpl in tx skb */ 70 SKCBF_RX_LRO = (1 << 3), /* lro skb */ 71 }; 72 73 struct cxgbit_skb_rx_cb { 74 u8 opcode; 75 void *pdu_cb; 76 void (*backlog_fn)(struct cxgbit_sock *, struct sk_buff *); 77 }; 78 79 struct cxgbit_skb_tx_cb { 80 u8 submode; 81 u32 extra_len; 82 }; 83 84 union cxgbit_skb_cb { 85 struct { 86 u8 flags; 87 union { 88 struct cxgbit_skb_tx_cb tx; 89 struct cxgbit_skb_rx_cb rx; 90 }; 91 }; 92 93 struct { 94 /* This member must be first. */ 95 struct l2t_skb_cb l2t; 96 struct sk_buff *wr_next; 97 }; 98 }; 99 100 #define CXGBIT_SKB_CB(skb) ((union cxgbit_skb_cb *)&((skb)->cb[0])) 101 #define cxgbit_skcb_flags(skb) (CXGBIT_SKB_CB(skb)->flags) 102 #define cxgbit_skcb_submode(skb) (CXGBIT_SKB_CB(skb)->tx.submode) 103 #define cxgbit_skcb_tx_wr_next(skb) (CXGBIT_SKB_CB(skb)->wr_next) 104 #define cxgbit_skcb_tx_extralen(skb) (CXGBIT_SKB_CB(skb)->tx.extra_len) 105 #define cxgbit_skcb_rx_opcode(skb) (CXGBIT_SKB_CB(skb)->rx.opcode) 106 #define cxgbit_skcb_rx_backlog_fn(skb) (CXGBIT_SKB_CB(skb)->rx.backlog_fn) 107 #define cxgbit_rx_pdu_cb(skb) (CXGBIT_SKB_CB(skb)->rx.pdu_cb) 108 109 static inline void *cplhdr(struct sk_buff *skb) 110 { 111 return skb->data; 112 } 113 114 enum cxgbit_cdev_flags { 115 CDEV_STATE_UP = 0, 116 CDEV_ISO_ENABLE, 117 CDEV_DDP_ENABLE, 118 }; 119 120 #define NP_INFO_HASH_SIZE 32 121 122 struct np_info { 123 struct np_info *next; 124 struct cxgbit_np *cnp; 125 unsigned int stid; 126 }; 127 128 struct cxgbit_list_head { 129 struct list_head list; 130 /* device lock */ 131 spinlock_t lock; 132 }; 133 134 struct cxgbit_device { 135 struct list_head list; 136 struct cxgb4_lld_info lldi; 137 struct np_info *np_hash_tab[NP_INFO_HASH_SIZE]; 138 /* np lock */ 139 spinlock_t np_lock; 140 u8 selectq[MAX_NPORTS][2]; 141 struct cxgbit_list_head cskq; 142 u32 mdsl; 143 struct kref kref; 144 unsigned long flags; 145 }; 146 147 struct cxgbit_wr_wait { 148 struct completion completion; 149 int ret; 150 }; 151 152 enum cxgbit_csk_state { 153 CSK_STATE_IDLE = 0, 154 CSK_STATE_LISTEN, 155 CSK_STATE_CONNECTING, 156 CSK_STATE_ESTABLISHED, 157 CSK_STATE_ABORTING, 158 CSK_STATE_CLOSING, 159 CSK_STATE_MORIBUND, 160 CSK_STATE_DEAD, 161 }; 162 163 enum cxgbit_csk_flags { 164 CSK_TX_DATA_SENT = 0, 165 CSK_LOGIN_PDU_DONE, 166 CSK_LOGIN_DONE, 167 CSK_DDP_ENABLE, 168 }; 169 170 struct cxgbit_sock_common { 171 struct cxgbit_device *cdev; 172 struct sockaddr_storage local_addr; 173 struct sockaddr_storage remote_addr; 174 struct cxgbit_wr_wait wr_wait; 175 enum cxgbit_csk_state state; 176 unsigned long flags; 177 }; 178 179 struct cxgbit_np { 180 struct cxgbit_sock_common com; 181 wait_queue_head_t accept_wait; 182 struct iscsi_np *np; 183 struct completion accept_comp; 184 struct list_head np_accept_list; 185 /* np accept lock */ 186 spinlock_t np_accept_lock; 187 struct kref kref; 188 unsigned int stid; 189 }; 190 191 struct cxgbit_sock { 192 struct cxgbit_sock_common com; 193 struct cxgbit_np *cnp; 194 struct iscsi_conn *conn; 195 struct l2t_entry *l2t; 196 struct dst_entry *dst; 197 struct list_head list; 198 struct sk_buff_head rxq; 199 struct sk_buff_head txq; 200 struct sk_buff_head ppodq; 201 struct sk_buff_head backlogq; 202 struct sk_buff_head skbq; 203 struct sk_buff *wr_pending_head; 204 struct sk_buff *wr_pending_tail; 205 struct sk_buff *skb; 206 struct sk_buff *lro_skb; 207 struct sk_buff *lro_hskb; 208 struct list_head accept_node; 209 /* socket lock */ 210 spinlock_t lock; 211 wait_queue_head_t waitq; 212 wait_queue_head_t ack_waitq; 213 bool lock_owner; 214 struct kref kref; 215 u32 max_iso_npdu; 216 u32 wr_cred; 217 u32 wr_una_cred; 218 u32 wr_max_cred; 219 u32 snd_una; 220 u32 tid; 221 u32 snd_nxt; 222 u32 rcv_nxt; 223 u32 smac_idx; 224 u32 tx_chan; 225 u32 mtu; 226 u32 write_seq; 227 u32 rx_credits; 228 u32 snd_win; 229 u32 rcv_win; 230 u16 mss; 231 u16 emss; 232 u16 plen; 233 u16 rss_qid; 234 u16 txq_idx; 235 u16 ctrlq_idx; 236 u8 tos; 237 u8 port_id; 238 #define CXGBIT_SUBMODE_HCRC 0x1 239 #define CXGBIT_SUBMODE_DCRC 0x2 240 u8 submode; 241 #ifdef CONFIG_CHELSIO_T4_DCB 242 u8 dcb_priority; 243 #endif 244 u8 snd_wscale; 245 }; 246 247 void _cxgbit_free_cdev(struct kref *kref); 248 void _cxgbit_free_csk(struct kref *kref); 249 void _cxgbit_free_cnp(struct kref *kref); 250 251 static inline void cxgbit_get_cdev(struct cxgbit_device *cdev) 252 { 253 kref_get(&cdev->kref); 254 } 255 256 static inline void cxgbit_put_cdev(struct cxgbit_device *cdev) 257 { 258 kref_put(&cdev->kref, _cxgbit_free_cdev); 259 } 260 261 static inline void cxgbit_get_csk(struct cxgbit_sock *csk) 262 { 263 kref_get(&csk->kref); 264 } 265 266 static inline void cxgbit_put_csk(struct cxgbit_sock *csk) 267 { 268 kref_put(&csk->kref, _cxgbit_free_csk); 269 } 270 271 static inline void cxgbit_get_cnp(struct cxgbit_np *cnp) 272 { 273 kref_get(&cnp->kref); 274 } 275 276 static inline void cxgbit_put_cnp(struct cxgbit_np *cnp) 277 { 278 kref_put(&cnp->kref, _cxgbit_free_cnp); 279 } 280 281 static inline void cxgbit_sock_reset_wr_list(struct cxgbit_sock *csk) 282 { 283 csk->wr_pending_tail = NULL; 284 csk->wr_pending_head = NULL; 285 } 286 287 static inline struct sk_buff *cxgbit_sock_peek_wr(const struct cxgbit_sock *csk) 288 { 289 return csk->wr_pending_head; 290 } 291 292 static inline void 293 cxgbit_sock_enqueue_wr(struct cxgbit_sock *csk, struct sk_buff *skb) 294 { 295 cxgbit_skcb_tx_wr_next(skb) = NULL; 296 297 skb_get(skb); 298 299 if (!csk->wr_pending_head) 300 csk->wr_pending_head = skb; 301 else 302 cxgbit_skcb_tx_wr_next(csk->wr_pending_tail) = skb; 303 csk->wr_pending_tail = skb; 304 } 305 306 static inline struct sk_buff *cxgbit_sock_dequeue_wr(struct cxgbit_sock *csk) 307 { 308 struct sk_buff *skb = csk->wr_pending_head; 309 310 if (likely(skb)) { 311 csk->wr_pending_head = cxgbit_skcb_tx_wr_next(skb); 312 cxgbit_skcb_tx_wr_next(skb) = NULL; 313 } 314 return skb; 315 } 316 317 typedef void (*cxgbit_cplhandler_func)(struct cxgbit_device *, 318 struct sk_buff *); 319 320 int cxgbit_setup_np(struct iscsi_np *, struct sockaddr_storage *); 321 int cxgbit_setup_conn_digest(struct cxgbit_sock *); 322 int cxgbit_accept_np(struct iscsi_np *, struct iscsi_conn *); 323 void cxgbit_free_np(struct iscsi_np *); 324 void cxgbit_free_conn(struct iscsi_conn *); 325 extern cxgbit_cplhandler_func cxgbit_cplhandlers[NUM_CPL_CMDS]; 326 int cxgbit_get_login_rx(struct iscsi_conn *, struct iscsi_login *); 327 int cxgbit_rx_data_ack(struct cxgbit_sock *); 328 int cxgbit_l2t_send(struct cxgbit_device *, struct sk_buff *, 329 struct l2t_entry *); 330 void cxgbit_push_tx_frames(struct cxgbit_sock *); 331 int cxgbit_put_login_tx(struct iscsi_conn *, struct iscsi_login *, u32); 332 int cxgbit_xmit_pdu(struct iscsi_conn *, struct iscsi_cmd *, 333 struct iscsi_datain_req *, const void *, u32); 334 void cxgbit_get_r2t_ttt(struct iscsi_conn *, struct iscsi_cmd *, 335 struct iscsi_r2t *); 336 u32 cxgbit_send_tx_flowc_wr(struct cxgbit_sock *); 337 int cxgbit_ofld_send(struct cxgbit_device *, struct sk_buff *); 338 void cxgbit_get_rx_pdu(struct iscsi_conn *); 339 int cxgbit_validate_params(struct iscsi_conn *); 340 struct cxgbit_device *cxgbit_find_device(struct net_device *, u8 *); 341 342 /* DDP */ 343 int cxgbit_ddp_init(struct cxgbit_device *); 344 int cxgbit_setup_conn_pgidx(struct cxgbit_sock *, u32); 345 int cxgbit_reserve_ttt(struct cxgbit_sock *, struct iscsi_cmd *); 346 void cxgbit_release_cmd(struct iscsi_conn *, struct iscsi_cmd *); 347 348 static inline 349 struct cxgbi_ppm *cdev2ppm(struct cxgbit_device *cdev) 350 { 351 return (struct cxgbi_ppm *)(*cdev->lldi.iscsi_ppm); 352 } 353 #endif /* __CXGBIT_H__ */ 354