sw/siw/siw_cm.h

0001 /* SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause */
0002
0003 /* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
0004 /*          Greg Joyce <greg@opengridcomputing.com> */
0005 /* Copyright (c) 2008-2019, IBM Corporation */
0006 /* Copyright (c) 2017, Open Grid Computing, Inc. */
0007
0008 #ifndef _SIW_CM_H
0009 #define _SIW_CM_H
0010
0011 #include <net/sock.h>
0012 #include <linux/tcp.h>
0013
0014 #include <rdma/iw_cm.h>
0015
0016 enum siw_cep_state {
0017     SIW_EPSTATE_IDLE = 1,
0018     SIW_EPSTATE_LISTENING,
0019     SIW_EPSTATE_CONNECTING,
0020     SIW_EPSTATE_AWAIT_MPAREQ,
0021     SIW_EPSTATE_RECVD_MPAREQ,
0022     SIW_EPSTATE_AWAIT_MPAREP,
0023     SIW_EPSTATE_RDMA_MODE,
0024     SIW_EPSTATE_CLOSED
0025 };
0026
0027 struct siw_mpa_info {
0028     struct mpa_rr hdr; /* peer mpa hdr in host byte order */
0029     struct mpa_v2_data v2_ctrl;
0030     struct mpa_v2_data v2_ctrl_req;
0031     char *pdata;
0032     int bytes_rcvd;
0033 };
0034
0035 struct siw_device;
0036
0037 struct siw_cep {
0038     struct iw_cm_id *cm_id;
0039     struct siw_device *sdev;
0040     struct list_head devq;
0041     spinlock_t lock;
0042     struct kref ref;
0043     int in_use;
0044     wait_queue_head_t waitq;
0045     enum siw_cep_state state;
0046
0047     struct list_head listenq;
0048     struct siw_cep *listen_cep;
0049
0050     struct siw_qp *qp;
0051     struct socket *sock;
0052
0053     struct siw_cm_work *mpa_timer;
0054     struct list_head work_freelist;
0055
0056     struct siw_mpa_info mpa;
0057     int ord;
0058     int ird;
0059     bool enhanced_rdma_conn_est;
0060
0061     /* Saved upcalls of socket */
0062     void (*sk_state_change)(struct sock *sk);
0063     void (*sk_data_ready)(struct sock *sk);
0064     void (*sk_write_space)(struct sock *sk);
0065     void (*sk_error_report)(struct sock *sk);
0066 };
0067
0068 /*
0069  * Connection initiator waits 10 seconds to receive an
0070  * MPA reply after sending out MPA request. Reponder waits for
0071  * 5 seconds for MPA request to arrive if new TCP connection
0072  * was set up.
0073  */
0074 #define MPAREQ_TIMEOUT (HZ * 10)
0075 #define MPAREP_TIMEOUT (HZ * 5)
0076
0077 enum siw_work_type {
0078     SIW_CM_WORK_ACCEPT = 1,
0079     SIW_CM_WORK_READ_MPAHDR,
0080     SIW_CM_WORK_CLOSE_LLP, /* close socket */
0081     SIW_CM_WORK_PEER_CLOSE, /* socket indicated peer close */
0082     SIW_CM_WORK_MPATIMEOUT
0083 };
0084
0085 struct siw_cm_work {
0086     struct delayed_work work;
0087     struct list_head list;
0088     enum siw_work_type type;
0089     struct siw_cep *cep;
0090 };
0091
0092 #define to_sockaddr_in(a) (*(struct sockaddr_in *)(&(a)))
0093 #define to_sockaddr_in6(a) (*(struct sockaddr_in6 *)(&(a)))
0094
0095 static inline int getname_peer(struct socket *s, struct sockaddr_storage *a)
0096 {
0097     return s->ops->getname(s, (struct sockaddr *)a, 1);
0098 }
0099
0100 static inline int getname_local(struct socket *s, struct sockaddr_storage *a)
0101 {
0102     return s->ops->getname(s, (struct sockaddr *)a, 0);
0103 }
0104
0105 static inline int ksock_recv(struct socket *sock, char *buf, size_t size,
0106                  int flags)
0107 {
0108     struct kvec iov = { buf, size };
0109     struct msghdr msg = { .msg_name = NULL, .msg_flags = flags };
0110
0111     return kernel_recvmsg(sock, &msg, &iov, 1, size, flags);
0112 }
0113
0114 int siw_connect(struct iw_cm_id *id, struct iw_cm_conn_param *parm);
0115 int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *param);
0116 int siw_reject(struct iw_cm_id *id, const void *data, u8 len);
0117 int siw_create_listen(struct iw_cm_id *id, int backlog);
0118 int siw_destroy_listen(struct iw_cm_id *id);
0119
0120 void siw_cep_get(struct siw_cep *cep);
0121 void siw_cep_put(struct siw_cep *cep);
0122 int siw_cm_queue_work(struct siw_cep *cep, enum siw_work_type type);
0123
0124 int siw_cm_init(void);
0125 void siw_cm_exit(void);
0126
0127 /*
0128  * TCP socket interface
0129  */
0130 #define sk_to_qp(sk) (((struct siw_cep *)((sk)->sk_user_data))->qp)
0131 #define sk_to_cep(sk) ((struct siw_cep *)((sk)->sk_user_data))
0132
0133 #endif