drivers/target/iscsi/cxgbit/cxgbit.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (c) 2016 Chelsio Communications, Inc.
   4  */
   5
   6 #ifndef __CXGBIT_H__
   7 #define __CXGBIT_H__
   8
   9 #include <linux/mutex.h>
  10 #include <linux/list.h>
  11 #include <linux/spinlock.h>
  12 #include <linux/idr.h>
  13 #include <linux/completion.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/sched.h>
  16 #include <linux/pci.h>
  17 #include <linux/dma-mapping.h>
  18 #include <linux/inet.h>
  19 #include <linux/wait.h>
  20 #include <linux/kref.h>
  21 #include <linux/timer.h>
  22 #include <linux/io.h>
  23
  24 #include <asm/byteorder.h>
  25
  26 #include <net/net_namespace.h>
  27
  28 #include <target/iscsi/iscsi_transport.h>
  29 #include <iscsi_target_parameters.h>
  30 #include <iscsi_target_login.h>
  31
  32 #include "t4_regs.h"
  33 #include "t4_msg.h"
  34 #include "cxgb4.h"
  35 #include "cxgb4_uld.h"
  36 #include "l2t.h"
  37 #include "libcxgb_ppm.h"
  38 #include "cxgbit_lro.h"
  39
  40 extern struct mutex cdev_list_lock;
  41 extern struct list_head cdev_list_head;
  42 struct cxgbit_np;
  43
  44 struct cxgbit_sock;
  45
  46 struct cxgbit_cmd {
  47         struct scatterlist sg;
  48         struct cxgbi_task_tag_info ttinfo;
  49         bool setup_ddp;
  50         bool release;
  51 };
  52
  53 #define CXGBIT_MAX_ISO_PAYLOAD  \
  54         min_t(u32, MAX_SKB_FRAGS * PAGE_SIZE, 65535)
  55
  56 struct cxgbit_iso_info {
  57         u8 flags;
  58         u32 mpdu;
  59         u32 len;
  60         u32 burst_len;
  61 };
  62
  63 enum cxgbit_skcb_flags {
  64         SKCBF_TX_NEED_HDR       = (1 << 0), /* packet needs a header */
  65         SKCBF_TX_FLAG_COMPL     = (1 << 1), /* wr completion flag */
  66         SKCBF_TX_ISO            = (1 << 2), /* iso cpl in tx skb */
  67         SKCBF_RX_LRO            = (1 << 3), /* lro skb */
  68 };
  69
  70 struct cxgbit_skb_rx_cb {
  71         u8 opcode;
  72         void *pdu_cb;
  73         void (*backlog_fn)(struct cxgbit_sock *, struct sk_buff *);
  74 };
  75
  76 struct cxgbit_skb_tx_cb {
  77         u8 submode;
  78         u32 extra_len;
  79 };
  80
  81 union cxgbit_skb_cb {
  82         struct {
  83                 u8 flags;
  84                 union {
  85                         struct cxgbit_skb_tx_cb tx;
  86                         struct cxgbit_skb_rx_cb rx;
  87                 };
  88         };
  89
  90         struct {
  91                 /* This member must be first. */
  92                 struct l2t_skb_cb l2t;
  93                 struct sk_buff *wr_next;
  94         };
  95 };
  96
  97 #define CXGBIT_SKB_CB(skb)      ((union cxgbit_skb_cb *)&((skb)->cb[0]))
  98 #define cxgbit_skcb_flags(skb)          (CXGBIT_SKB_CB(skb)->flags)
  99 #define cxgbit_skcb_submode(skb)        (CXGBIT_SKB_CB(skb)->tx.submode)
 100 #define cxgbit_skcb_tx_wr_next(skb)     (CXGBIT_SKB_CB(skb)->wr_next)
 101 #define cxgbit_skcb_tx_extralen(skb)    (CXGBIT_SKB_CB(skb)->tx.extra_len)
 102 #define cxgbit_skcb_rx_opcode(skb)      (CXGBIT_SKB_CB(skb)->rx.opcode)
 103 #define cxgbit_skcb_rx_backlog_fn(skb)  (CXGBIT_SKB_CB(skb)->rx.backlog_fn)
 104 #define cxgbit_rx_pdu_cb(skb)           (CXGBIT_SKB_CB(skb)->rx.pdu_cb)
 105
 106 static inline void *cplhdr(struct sk_buff *skb)
 107 {
 108         return skb->data;
 109 }
 110
 111 enum cxgbit_cdev_flags {
 112         CDEV_STATE_UP = 0,
 113         CDEV_ISO_ENABLE,
 114         CDEV_DDP_ENABLE,
 115 };
 116
 117 #define NP_INFO_HASH_SIZE 32
 118
 119 struct np_info {
 120         struct np_info *next;
 121         struct cxgbit_np *cnp;
 122         unsigned int stid;
 123 };
 124
 125 struct cxgbit_list_head {
 126         struct list_head list;
 127         /* device lock */
 128         spinlock_t lock;
 129 };
 130
 131 struct cxgbit_device {
 132         struct list_head list;
 133         struct cxgb4_lld_info lldi;
 134         struct np_info *np_hash_tab[NP_INFO_HASH_SIZE];
 135         /* np lock */
 136         spinlock_t np_lock;
 137         u8 selectq[MAX_NPORTS][2];
 138         struct cxgbit_list_head cskq;
 139         u32 mdsl;
 140         struct kref kref;
 141         unsigned long flags;
 142 };
 143
 144 struct cxgbit_wr_wait {
 145         struct completion completion;
 146         int ret;
 147 };
 148
 149 enum cxgbit_csk_state {
 150         CSK_STATE_IDLE = 0,
 151         CSK_STATE_LISTEN,
 152         CSK_STATE_CONNECTING,
 153         CSK_STATE_ESTABLISHED,
 154         CSK_STATE_ABORTING,
 155         CSK_STATE_CLOSING,
 156         CSK_STATE_MORIBUND,
 157         CSK_STATE_DEAD,
 158 };
 159
 160 enum cxgbit_csk_flags {
 161         CSK_TX_DATA_SENT = 0,
 162         CSK_LOGIN_PDU_DONE,
 163         CSK_LOGIN_DONE,
 164         CSK_DDP_ENABLE,
 165         CSK_ABORT_RPL_WAIT,
 166 };
 167
 168 struct cxgbit_sock_common {
 169         struct cxgbit_device *cdev;
 170         struct sockaddr_storage local_addr;
 171         struct sockaddr_storage remote_addr;
 172         struct cxgbit_wr_wait wr_wait;
 173         enum cxgbit_csk_state state;
 174         unsigned long flags;
 175 };
 176
 177 struct cxgbit_np {
 178         struct cxgbit_sock_common com;
 179         wait_queue_head_t accept_wait;
 180         struct iscsi_np *np;
 181         struct completion accept_comp;
 182         struct list_head np_accept_list;
 183         /* np accept lock */
 184         spinlock_t np_accept_lock;
 185         struct kref kref;
 186         unsigned int stid;
 187 };
 188
 189 struct cxgbit_sock {
 190         struct cxgbit_sock_common com;
 191         struct cxgbit_np *cnp;
 192         struct iscsi_conn *conn;
 193         struct l2t_entry *l2t;
 194         struct dst_entry *dst;
 195         struct list_head list;
 196         struct sk_buff_head rxq;
 197         struct sk_buff_head txq;
 198         struct sk_buff_head ppodq;
 199         struct sk_buff_head backlogq;
 200         struct sk_buff_head skbq;
 201         struct sk_buff *wr_pending_head;
 202         struct sk_buff *wr_pending_tail;
 203         struct sk_buff *skb;
 204         struct sk_buff *lro_skb;
 205         struct sk_buff *lro_hskb;
 206         struct list_head accept_node;
 207         /* socket lock */
 208         spinlock_t lock;
 209         wait_queue_head_t waitq;
 210         wait_queue_head_t ack_waitq;
 211         bool lock_owner;
 212         struct kref kref;
 213         u32 max_iso_npdu;
 214         u32 wr_cred;
 215         u32 wr_una_cred;
 216         u32 wr_max_cred;
 217         u32 snd_una;
 218         u32 tid;
 219         u32 snd_nxt;
 220         u32 rcv_nxt;
 221         u32 smac_idx;
 222         u32 tx_chan;
 223         u32 mtu;
 224         u32 write_seq;
 225         u32 rx_credits;
 226         u32 snd_win;
 227         u32 rcv_win;
 228         u16 mss;
 229         u16 emss;
 230         u16 plen;
 231         u16 rss_qid;
 232         u16 txq_idx;
 233         u16 ctrlq_idx;
 234         u8 tos;
 235         u8 port_id;
 236 #define CXGBIT_SUBMODE_HCRC 0x1
 237 #define CXGBIT_SUBMODE_DCRC 0x2
 238         u8 submode;
 239 #ifdef CONFIG_CHELSIO_T4_DCB
 240         u8 dcb_priority;
 241 #endif
 242         u8 snd_wscale;
 243 };
 244
 245 void _cxgbit_free_cdev(struct kref *kref);
 246 void _cxgbit_free_csk(struct kref *kref);
 247 void _cxgbit_free_cnp(struct kref *kref);
 248
 249 static inline void cxgbit_get_cdev(struct cxgbit_device *cdev)
 250 {
 251         kref_get(&cdev->kref);
 252 }
 253
 254 static inline void cxgbit_put_cdev(struct cxgbit_device *cdev)
 255 {
 256         kref_put(&cdev->kref, _cxgbit_free_cdev);
 257 }
 258
 259 static inline void cxgbit_get_csk(struct cxgbit_sock *csk)
 260 {
 261         kref_get(&csk->kref);
 262 }
 263
 264 static inline void cxgbit_put_csk(struct cxgbit_sock *csk)
 265 {
 266         kref_put(&csk->kref, _cxgbit_free_csk);
 267 }
 268
 269 static inline void cxgbit_get_cnp(struct cxgbit_np *cnp)
 270 {
 271         kref_get(&cnp->kref);
 272 }
 273
 274 static inline void cxgbit_put_cnp(struct cxgbit_np *cnp)
 275 {
 276         kref_put(&cnp->kref, _cxgbit_free_cnp);
 277 }
 278
 279 static inline void cxgbit_sock_reset_wr_list(struct cxgbit_sock *csk)
 280 {
 281         csk->wr_pending_tail = NULL;
 282         csk->wr_pending_head = NULL;
 283 }
 284
 285 static inline struct sk_buff *cxgbit_sock_peek_wr(const struct cxgbit_sock *csk)
 286 {
 287         return csk->wr_pending_head;
 288 }
 289
 290 static inline void
 291 cxgbit_sock_enqueue_wr(struct cxgbit_sock *csk, struct sk_buff *skb)
 292 {
 293         cxgbit_skcb_tx_wr_next(skb) = NULL;
 294
 295         skb_get(skb);
 296
 297         if (!csk->wr_pending_head)
 298                 csk->wr_pending_head = skb;
 299         else
 300                 cxgbit_skcb_tx_wr_next(csk->wr_pending_tail) = skb;
 301         csk->wr_pending_tail = skb;
 302 }
 303
 304 static inline struct sk_buff *cxgbit_sock_dequeue_wr(struct cxgbit_sock *csk)
 305 {
 306         struct sk_buff *skb = csk->wr_pending_head;
 307
 308         if (likely(skb)) {
 309                 csk->wr_pending_head = cxgbit_skcb_tx_wr_next(skb);
 310                 cxgbit_skcb_tx_wr_next(skb) = NULL;
 311         }
 312         return skb;
 313 }
 314
 315 typedef void (*cxgbit_cplhandler_func)(struct cxgbit_device *,
 316                                        struct sk_buff *);
 317
 318 int cxgbit_setup_np(struct iscsi_np *, struct sockaddr_storage *);
 319 int cxgbit_setup_conn_digest(struct cxgbit_sock *);
 320 int cxgbit_accept_np(struct iscsi_np *, struct iscsi_conn *);
 321 void cxgbit_free_np(struct iscsi_np *);
 322 void cxgbit_abort_conn(struct cxgbit_sock *csk);
 323 void cxgbit_free_conn(struct iscsi_conn *);
 324 extern cxgbit_cplhandler_func cxgbit_cplhandlers[NUM_CPL_CMDS];
 325 int cxgbit_get_login_rx(struct iscsi_conn *, struct iscsi_login *);
 326 int cxgbit_rx_data_ack(struct cxgbit_sock *);
 327 int cxgbit_l2t_send(struct cxgbit_device *, struct sk_buff *,
 328                     struct l2t_entry *);
 329 void cxgbit_push_tx_frames(struct cxgbit_sock *);
 330 int cxgbit_put_login_tx(struct iscsi_conn *, struct iscsi_login *, u32);
 331 int cxgbit_xmit_pdu(struct iscsi_conn *, struct iscsi_cmd *,
 332                     struct iscsi_datain_req *, const void *, u32);
 333 void cxgbit_get_r2t_ttt(struct iscsi_conn *, struct iscsi_cmd *,
 334                         struct iscsi_r2t *);
 335 u32 cxgbit_send_tx_flowc_wr(struct cxgbit_sock *);
 336 int cxgbit_ofld_send(struct cxgbit_device *, struct sk_buff *);
 337 void cxgbit_get_rx_pdu(struct iscsi_conn *);
 338 int cxgbit_validate_params(struct iscsi_conn *);
 339 struct cxgbit_device *cxgbit_find_device(struct net_device *, u8 *);
 340
 341 /* DDP */
 342 int cxgbit_ddp_init(struct cxgbit_device *);
 343 int cxgbit_setup_conn_pgidx(struct cxgbit_sock *, u32);
 344 int cxgbit_reserve_ttt(struct cxgbit_sock *, struct iscsi_cmd *);
 345 void cxgbit_unmap_cmd(struct iscsi_conn *, struct iscsi_cmd *);
 346
 347 static inline
 348 struct cxgbi_ppm *cdev2ppm(struct cxgbit_device *cdev)
 349 {
 350         return (struct cxgbi_ppm *)(*cdev->lldi.iscsi_ppm);
 351 }
 352 #endif /* __CXGBIT_H__ */