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rdma/siw: connection management 

Broken up commit to add the Soft iWarp RDMA driver.

Signed-off-by: Bernard Metzler <bmt@zurich.ibm.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Bernard Metzler 2019-06-20 18:21:26 +02:00 committed by Jason Gunthorpe
parent bdcf26bf9b
commit 6c52fdc244
2 changed files with 2205 additions and 0 deletions
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2072
drivers/infiniband/sw/siw/siw_cm.c Normal file
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drivers/infiniband/sw/siw/siw_cm.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 or BSD-3-Clause */
/* Authors: Bernard Metzler <bmt@zurich.ibm.com> */
/* Greg Joyce <greg@opengridcomputing.com> */
/* Copyright (c) 2008-2019, IBM Corporation */
/* Copyright (c) 2017, Open Grid Computing, Inc. */
#ifndef _SIW_CM_H
#define _SIW_CM_H
#include <net/sock.h>
#include <linux/tcp.h>
#include <rdma/iw_cm.h>
enum siw_cep_state {
SIW_EPSTATE_IDLE = 1,
SIW_EPSTATE_LISTENING,
SIW_EPSTATE_CONNECTING,
SIW_EPSTATE_AWAIT_MPAREQ,
SIW_EPSTATE_RECVD_MPAREQ,
SIW_EPSTATE_AWAIT_MPAREP,
SIW_EPSTATE_RDMA_MODE,
SIW_EPSTATE_CLOSED
};
struct siw_mpa_info {
struct mpa_rr hdr; /* peer mpa hdr in host byte order */
struct mpa_v2_data v2_ctrl;
struct mpa_v2_data v2_ctrl_req;
char *pdata;
int bytes_rcvd;
};
struct siw_device;
struct siw_cep {
struct iw_cm_id *cm_id;
struct siw_device *sdev;
struct list_head devq;
spinlock_t lock;
struct kref ref;
int in_use;
wait_queue_head_t waitq;
enum siw_cep_state state;
struct list_head listenq;
struct siw_cep *listen_cep;
struct siw_qp *qp;
struct socket *sock;
struct siw_cm_work *mpa_timer;
struct list_head work_freelist;
struct siw_mpa_info mpa;
int ord;
int ird;
bool enhanced_rdma_conn_est;
/* Saved upcalls of socket */
void (*sk_state_change)(struct sock *sk);
void (*sk_data_ready)(struct sock *sk);
void (*sk_write_space)(struct sock *sk);
void (*sk_error_report)(struct sock *sk);
};
/*
* Connection initiator waits 10 seconds to receive an
* MPA reply after sending out MPA request. Reponder waits for
* 5 seconds for MPA request to arrive if new TCP connection
* was set up.
*/
#define MPAREQ_TIMEOUT (HZ * 10)
#define MPAREP_TIMEOUT (HZ * 5)
enum siw_work_type {
SIW_CM_WORK_ACCEPT = 1,
SIW_CM_WORK_READ_MPAHDR,
SIW_CM_WORK_CLOSE_LLP, /* close socket */
SIW_CM_WORK_PEER_CLOSE, /* socket indicated peer close */
SIW_CM_WORK_MPATIMEOUT
};
struct siw_cm_work {
struct delayed_work work;
struct list_head list;
enum siw_work_type type;
struct siw_cep *cep;
};
#define to_sockaddr_in(a) (*(struct sockaddr_in *)(&(a)))
#define to_sockaddr_in6(a) (*(struct sockaddr_in6 *)(&(a)))
static inline int getname_peer(struct socket *s, struct sockaddr_storage *a)
{
return s->ops->getname(s, (struct sockaddr *)a, 1);
}
static inline int getname_local(struct socket *s, struct sockaddr_storage *a)
{
return s->ops->getname(s, (struct sockaddr *)a, 0);
}
static inline int ksock_recv(struct socket *sock, char *buf, size_t size,
int flags)
{
struct kvec iov = { buf, size };
struct msghdr msg = { .msg_name = NULL, .msg_flags = flags };
return kernel_recvmsg(sock, &msg, &iov, 1, size, flags);
}
int siw_connect(struct iw_cm_id *id, struct iw_cm_conn_param *parm);
int siw_accept(struct iw_cm_id *id, struct iw_cm_conn_param *param);
int siw_reject(struct iw_cm_id *id, const void *data, u8 len);
int siw_create_listen(struct iw_cm_id *id, int backlog);
int siw_destroy_listen(struct iw_cm_id *id);
void siw_cep_get(struct siw_cep *cep);
void siw_cep_put(struct siw_cep *cep);
int siw_cm_queue_work(struct siw_cep *cep, enum siw_work_type type);
int siw_cm_init(void);
void siw_cm_exit(void);
/*
* TCP socket interface
*/
#define sk_to_qp(sk) (((struct siw_cep *)((sk)->sk_user_data))->qp)
#define sk_to_cep(sk) ((struct siw_cep *)((sk)->sk_user_data))
#endif