drivers/infiniband/sw/siw/siw_cm.h

   1 /* SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause */
   2
   3 /* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
   4 /*          Greg Joyce <greg@opengridcomputing.com> */
   5 /* Copyright (c) 2008-2019, IBM Corporation */
   6 /* Copyright (c) 2017, Open Grid Computing, Inc. */
   7
   8 #ifndef _SIW_CM_H
   9 #define _SIW_CM_H
  10
  11 #include <net/sock.h>
  12 #include <linux/tcp.h>
  13
  14 #include <rdma/iw_cm.h>
  15
  16 enum siw_cep_state {
  17         SIW_EPSTATE_IDLE = 1,
  18         SIW_EPSTATE_LISTENING,
  19         SIW_EPSTATE_CONNECTING,
  20         SIW_EPSTATE_AWAIT_MPAREQ,
  21         SIW_EPSTATE_RECVD_MPAREQ,
  22         SIW_EPSTATE_AWAIT_MPAREP,
  23         SIW_EPSTATE_RDMA_MODE,
  24         SIW_EPSTATE_CLOSED
  25 };
  26
  27 struct siw_mpa_info {
  28         struct mpa_rr hdr; /* peer mpa hdr in host byte order */
  29         struct mpa_v2_data v2_ctrl;
  30         struct mpa_v2_data v2_ctrl_req;
  31         char *pdata;
  32         int bytes_rcvd;
  33 };
  34
  35 struct siw_device;
  36
  37 struct siw_cep {
  38         struct iw_cm_id *cm_id;
  39         struct siw_device *sdev;
  40         struct list_head devq;
  41         spinlock_t lock;
  42         struct kref ref;
  43         int in_use;
  44         wait_queue_head_t waitq;
  45         enum siw_cep_state state;
  46
  47         struct list_head listenq;
  48         struct siw_cep *listen_cep;
  49
  50         struct siw_qp *qp;
  51         struct socket *sock;
  52
  53         struct siw_cm_work *mpa_timer;
  54         struct list_head work_freelist;
  55
  56         struct siw_mpa_info mpa;
  57         int ord;
  58         int ird;
  59         bool enhanced_rdma_conn_est;
  60
  61         /* Saved upcalls of socket */
  62         void (*sk_state_change)(struct sock *sk);
  63         void (*sk_data_ready)(struct sock *sk);
  64         void (*sk_write_space)(struct sock *sk);
  65         void (*sk_error_report)(struct sock *sk);
  66 };
  67
  68 /*
  69  * Connection initiator waits 10 seconds to receive an
  70  * MPA reply after sending out MPA request. Reponder waits for
  71  * 5 seconds for MPA request to arrive if new TCP connection
  72  * was set up.
  73  */
  74 #define MPAREQ_TIMEOUT (HZ * 10)
  75 #define MPAREP_TIMEOUT (HZ * 5)
  76
  77 enum siw_work_type {
  78         SIW_CM_WORK_ACCEPT = 1,
  79         SIW_CM_WORK_READ_MPAHDR,
  80         SIW_CM_WORK_CLOSE_LLP, /* close socket */
  81         SIW_CM_WORK_PEER_CLOSE, /* socket indicated peer close */
  82         SIW_CM_WORK_MPATIMEOUT
  83 };
  84
  85 struct siw_cm_work {
  86         struct delayed_work work;
  87         struct list_head list;
  88         enum siw_work_type type;
  89         struct siw_cep *cep;
  90 };
  91
  92 #define to_sockaddr_in(a) (*(struct sockaddr_in *)(&(a)))
  93 #define to_sockaddr_in6(a) (*(struct sockaddr_in6 *)(&(a)))
  94
  95 static inline int getname_peer(struct socket *s, struct sockaddr_storage *a)
  96 {
  97         return s->ops->getname(s, (struct sockaddr *)a, 1);
  98 }
  99
 100 static inline int getname_local(struct socket *s, struct sockaddr_storage *a)
 101 {
 102         return s->ops->getname(s, (struct sockaddr *)a, 0);
 103 }
 104
 105 static inline int ksock_recv(struct socket *sock, char *buf, size_t size,
 106                              int flags)
 107 {
 108         struct kvec iov = { buf, size };
 109         struct msghdr msg = { .msg_name = NULL, .msg_flags = flags };
 110
 111         return kernel_recvmsg(sock, &msg, &iov, 1, size, flags);
 112 }
 113
 114 int siw_connect(struct iw_cm_id *id, struct iw_cm_conn_param *parm);
 115 int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *param);
 116 int siw_reject(struct iw_cm_id *id, const void *data, u8 len);
 117 int siw_create_listen(struct iw_cm_id *id, int backlog);
 118 int siw_destroy_listen(struct iw_cm_id *id);
 119
 120 void siw_cep_get(struct siw_cep *cep);
 121 void siw_cep_put(struct siw_cep *cep);
 122 int siw_cm_queue_work(struct siw_cep *cep, enum siw_work_type type);
 123
 124 int siw_cm_init(void);
 125 void siw_cm_exit(void);
 126
 127 /*
 128  * TCP socket interface
 129  */
 130 #define sk_to_qp(sk) (((struct siw_cep *)((sk)->sk_user_data))->qp)
 131 #define sk_to_cep(sk) ((struct siw_cep *)((sk)->sk_user_data))
 132
 133 #endif