smc: establish new socket family
* enable smc module loading and unloading * register new socket family * basic smc socket creation and deletion * use backing TCP socket to run CLC (Connection Layer Control) handshake of SMC protocol * Setup for infiniband traffic is implemented in follow-on patches. For now fallback to TCP socket is always used. Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com> Reviewed-by: Utz Bacher <utz.bacher@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
4b9d07a440
commit
ac7138746e
9 changed files with 688 additions and 4 deletions
|
@ -10850,6 +10850,13 @@ S: Maintained
|
|||
F: drivers/staging/media/st-cec/
|
||||
F: Documentation/devicetree/bindings/media/stih-cec.txt
|
||||
|
||||
SHARED MEMORY COMMUNICATIONS (SMC) SOCKETS
|
||||
M: Ursula Braun <ubraun@linux.vnet.ibm.com>
|
||||
L: linux-s390@vger.kernel.org
|
||||
W: http://www.ibm.com/developerworks/linux/linux390/
|
||||
S: Supported
|
||||
F: net/smc/
|
||||
|
||||
SYNOPSYS DESIGNWARE DMAC DRIVER
|
||||
M: Viresh Kumar <vireshk@kernel.org>
|
||||
M: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
|
||||
|
|
|
@ -202,8 +202,12 @@ struct ucred {
|
|||
#define AF_VSOCK 40 /* vSockets */
|
||||
#define AF_KCM 41 /* Kernel Connection Multiplexor*/
|
||||
#define AF_QIPCRTR 42 /* Qualcomm IPC Router */
|
||||
#define AF_SMC 43 /* smc sockets: reserve number for
|
||||
* PF_SMC protocol family that
|
||||
* reuses AF_INET address family
|
||||
*/
|
||||
|
||||
#define AF_MAX 43 /* For now.. */
|
||||
#define AF_MAX 44 /* For now.. */
|
||||
|
||||
/* Protocol families, same as address families. */
|
||||
#define PF_UNSPEC AF_UNSPEC
|
||||
|
@ -251,6 +255,7 @@ struct ucred {
|
|||
#define PF_VSOCK AF_VSOCK
|
||||
#define PF_KCM AF_KCM
|
||||
#define PF_QIPCRTR AF_QIPCRTR
|
||||
#define PF_SMC AF_SMC
|
||||
#define PF_MAX AF_MAX
|
||||
|
||||
/* Maximum queue length specifiable by listen. */
|
||||
|
|
|
@ -57,6 +57,7 @@ source "net/packet/Kconfig"
|
|||
source "net/unix/Kconfig"
|
||||
source "net/xfrm/Kconfig"
|
||||
source "net/iucv/Kconfig"
|
||||
source "net/smc/Kconfig"
|
||||
|
||||
config INET
|
||||
bool "TCP/IP networking"
|
||||
|
|
|
@ -51,6 +51,7 @@ obj-$(CONFIG_MAC80211) += mac80211/
|
|||
obj-$(CONFIG_TIPC) += tipc/
|
||||
obj-$(CONFIG_NETLABEL) += netlabel/
|
||||
obj-$(CONFIG_IUCV) += iucv/
|
||||
obj-$(CONFIG_SMC) += smc/
|
||||
obj-$(CONFIG_RFKILL) += rfkill/
|
||||
obj-$(CONFIG_NET_9P) += 9p/
|
||||
obj-$(CONFIG_CAIF) += caif/
|
||||
|
|
|
@ -222,7 +222,7 @@ static const char *const af_family_key_strings[AF_MAX+1] = {
|
|||
"sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
|
||||
"sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
|
||||
"sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_KCM" ,
|
||||
"sk_lock-AF_MAX"
|
||||
"sk_lock-AF_SMC" , "sk_lock-AF_MAX"
|
||||
};
|
||||
static const char *const af_family_slock_key_strings[AF_MAX+1] = {
|
||||
"slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
|
||||
|
@ -239,7 +239,7 @@ static const char *const af_family_slock_key_strings[AF_MAX+1] = {
|
|||
"slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
|
||||
"slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
|
||||
"slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_KCM" ,
|
||||
"slock-AF_MAX"
|
||||
"slock-AF_SMC" , "slock-AF_MAX"
|
||||
};
|
||||
static const char *const af_family_clock_key_strings[AF_MAX+1] = {
|
||||
"clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
|
||||
|
@ -256,7 +256,7 @@ static const char *const af_family_clock_key_strings[AF_MAX+1] = {
|
|||
"clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
|
||||
"clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
|
||||
"clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_KCM" ,
|
||||
"clock-AF_MAX"
|
||||
"closck-AF_smc" , "clock-AF_MAX"
|
||||
};
|
||||
|
||||
/*
|
||||
|
|
11
net/smc/Kconfig
Normal file
11
net/smc/Kconfig
Normal file
|
@ -0,0 +1,11 @@
|
|||
config SMC
|
||||
tristate "SMC socket protocol family"
|
||||
depends on INET && INFINIBAND
|
||||
---help---
|
||||
SMC-R provides a "sockets over RDMA" solution making use of
|
||||
RDMA over Converged Ethernet (RoCE) technology to upgrade
|
||||
AF_INET TCP connections transparently.
|
||||
The Linux implementation of the SMC-R solution is designed as
|
||||
a separate socket family SMC.
|
||||
|
||||
Select this option if you want to run SMC socket applications
|
2
net/smc/Makefile
Normal file
2
net/smc/Makefile
Normal file
|
@ -0,0 +1,2 @@
|
|||
obj-$(CONFIG_SMC) += smc.o
|
||||
smc-y := af_smc.o
|
620
net/smc/af_smc.c
Normal file
620
net/smc/af_smc.c
Normal file
|
@ -0,0 +1,620 @@
|
|||
/*
|
||||
* Shared Memory Communications over RDMA (SMC-R) and RoCE
|
||||
*
|
||||
* AF_SMC protocol family socket handler keeping the AF_INET sock address type
|
||||
* applies to SOCK_STREAM sockets only
|
||||
* offers an alternative communication option for TCP-protocol sockets
|
||||
* applicable with RoCE-cards only
|
||||
*
|
||||
* Copyright IBM Corp. 2016
|
||||
*
|
||||
* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
|
||||
* based on prototype from Frank Blaschka
|
||||
*/
|
||||
|
||||
#define KMSG_COMPONENT "smc"
|
||||
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/socket.h>
|
||||
#include <net/sock.h>
|
||||
|
||||
#include "smc.h"
|
||||
|
||||
static void smc_set_keepalive(struct sock *sk, int val)
|
||||
{
|
||||
struct smc_sock *smc = smc_sk(sk);
|
||||
|
||||
smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
|
||||
}
|
||||
|
||||
static struct proto smc_proto = {
|
||||
.name = "SMC",
|
||||
.owner = THIS_MODULE,
|
||||
.keepalive = smc_set_keepalive,
|
||||
.obj_size = sizeof(struct smc_sock),
|
||||
.slab_flags = SLAB_DESTROY_BY_RCU,
|
||||
};
|
||||
|
||||
static int smc_release(struct socket *sock)
|
||||
{
|
||||
struct sock *sk = sock->sk;
|
||||
struct smc_sock *smc;
|
||||
|
||||
if (!sk)
|
||||
goto out;
|
||||
|
||||
smc = smc_sk(sk);
|
||||
lock_sock(sk);
|
||||
|
||||
sk->sk_state = SMC_CLOSED;
|
||||
if (smc->clcsock) {
|
||||
sock_release(smc->clcsock);
|
||||
smc->clcsock = NULL;
|
||||
}
|
||||
|
||||
/* detach socket */
|
||||
sock_orphan(sk);
|
||||
sock->sk = NULL;
|
||||
release_sock(sk);
|
||||
|
||||
sock_put(sk);
|
||||
out:
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void smc_destruct(struct sock *sk)
|
||||
{
|
||||
if (sk->sk_state != SMC_CLOSED)
|
||||
return;
|
||||
if (!sock_flag(sk, SOCK_DEAD))
|
||||
return;
|
||||
|
||||
sk_refcnt_debug_dec(sk);
|
||||
}
|
||||
|
||||
static struct sock *smc_sock_alloc(struct net *net, struct socket *sock)
|
||||
{
|
||||
struct smc_sock *smc;
|
||||
struct sock *sk;
|
||||
|
||||
sk = sk_alloc(net, PF_SMC, GFP_KERNEL, &smc_proto, 0);
|
||||
if (!sk)
|
||||
return NULL;
|
||||
|
||||
sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
|
||||
sk->sk_state = SMC_INIT;
|
||||
sk->sk_destruct = smc_destruct;
|
||||
sk->sk_protocol = SMCPROTO_SMC;
|
||||
sk_refcnt_debug_inc(sk);
|
||||
|
||||
smc = smc_sk(sk);
|
||||
|
||||
return sk;
|
||||
}
|
||||
|
||||
static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
|
||||
int addr_len)
|
||||
{
|
||||
struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
|
||||
struct sock *sk = sock->sk;
|
||||
struct smc_sock *smc;
|
||||
int rc;
|
||||
|
||||
smc = smc_sk(sk);
|
||||
|
||||
/* replicate tests from inet_bind(), to be safe wrt. future changes */
|
||||
rc = -EINVAL;
|
||||
if (addr_len < sizeof(struct sockaddr_in))
|
||||
goto out;
|
||||
|
||||
rc = -EAFNOSUPPORT;
|
||||
/* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
|
||||
if ((addr->sin_family != AF_INET) &&
|
||||
((addr->sin_family != AF_UNSPEC) ||
|
||||
(addr->sin_addr.s_addr != htonl(INADDR_ANY))))
|
||||
goto out;
|
||||
|
||||
lock_sock(sk);
|
||||
|
||||
/* Check if socket is already active */
|
||||
rc = -EINVAL;
|
||||
if (sk->sk_state != SMC_INIT)
|
||||
goto out_rel;
|
||||
|
||||
smc->clcsock->sk->sk_reuse = sk->sk_reuse;
|
||||
rc = kernel_bind(smc->clcsock, uaddr, addr_len);
|
||||
|
||||
out_rel:
|
||||
release_sock(sk);
|
||||
out:
|
||||
return rc;
|
||||
}
|
||||
|
||||
static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
|
||||
unsigned long mask)
|
||||
{
|
||||
/* options we don't get control via setsockopt for */
|
||||
nsk->sk_type = osk->sk_type;
|
||||
nsk->sk_sndbuf = osk->sk_sndbuf;
|
||||
nsk->sk_rcvbuf = osk->sk_rcvbuf;
|
||||
nsk->sk_sndtimeo = osk->sk_sndtimeo;
|
||||
nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
|
||||
nsk->sk_mark = osk->sk_mark;
|
||||
nsk->sk_priority = osk->sk_priority;
|
||||
nsk->sk_rcvlowat = osk->sk_rcvlowat;
|
||||
nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
|
||||
nsk->sk_err = osk->sk_err;
|
||||
|
||||
nsk->sk_flags &= ~mask;
|
||||
nsk->sk_flags |= osk->sk_flags & mask;
|
||||
}
|
||||
|
||||
#define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
|
||||
(1UL << SOCK_KEEPOPEN) | \
|
||||
(1UL << SOCK_LINGER) | \
|
||||
(1UL << SOCK_BROADCAST) | \
|
||||
(1UL << SOCK_TIMESTAMP) | \
|
||||
(1UL << SOCK_DBG) | \
|
||||
(1UL << SOCK_RCVTSTAMP) | \
|
||||
(1UL << SOCK_RCVTSTAMPNS) | \
|
||||
(1UL << SOCK_LOCALROUTE) | \
|
||||
(1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
|
||||
(1UL << SOCK_RXQ_OVFL) | \
|
||||
(1UL << SOCK_WIFI_STATUS) | \
|
||||
(1UL << SOCK_NOFCS) | \
|
||||
(1UL << SOCK_FILTER_LOCKED))
|
||||
/* copy only relevant settings and flags of SOL_SOCKET level from smc to
|
||||
* clc socket (since smc is not called for these options from net/core)
|
||||
*/
|
||||
static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
|
||||
{
|
||||
smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
|
||||
}
|
||||
|
||||
#define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
|
||||
(1UL << SOCK_KEEPOPEN) | \
|
||||
(1UL << SOCK_LINGER) | \
|
||||
(1UL << SOCK_DBG))
|
||||
/* copy only settings and flags relevant for smc from clc to smc socket */
|
||||
static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
|
||||
{
|
||||
smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
|
||||
}
|
||||
|
||||
static int smc_connect(struct socket *sock, struct sockaddr *addr,
|
||||
int alen, int flags)
|
||||
{
|
||||
struct sock *sk = sock->sk;
|
||||
struct smc_sock *smc;
|
||||
int rc = -EINVAL;
|
||||
|
||||
smc = smc_sk(sk);
|
||||
|
||||
/* separate smc parameter checking to be safe */
|
||||
if (alen < sizeof(addr->sa_family))
|
||||
goto out_err;
|
||||
if (addr->sa_family != AF_INET)
|
||||
goto out_err;
|
||||
|
||||
lock_sock(sk);
|
||||
switch (sk->sk_state) {
|
||||
default:
|
||||
goto out;
|
||||
case SMC_ACTIVE:
|
||||
rc = -EISCONN;
|
||||
goto out;
|
||||
case SMC_INIT:
|
||||
rc = 0;
|
||||
break;
|
||||
}
|
||||
|
||||
smc_copy_sock_settings_to_clc(smc);
|
||||
rc = kernel_connect(smc->clcsock, addr, alen, flags);
|
||||
if (rc)
|
||||
goto out;
|
||||
|
||||
sk->sk_state = SMC_ACTIVE;
|
||||
|
||||
/* always use TCP fallback as transport mechanism for now;
|
||||
* This will change once RDMA transport is implemented
|
||||
*/
|
||||
smc->use_fallback = true;
|
||||
|
||||
out:
|
||||
release_sock(sk);
|
||||
out_err:
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
|
||||
{
|
||||
struct sock *sk = &lsmc->sk;
|
||||
struct socket *new_clcsock;
|
||||
struct sock *new_sk;
|
||||
int rc;
|
||||
|
||||
new_sk = smc_sock_alloc(sock_net(sk), NULL);
|
||||
if (!new_sk) {
|
||||
rc = -ENOMEM;
|
||||
lsmc->sk.sk_err = ENOMEM;
|
||||
*new_smc = NULL;
|
||||
goto out;
|
||||
}
|
||||
*new_smc = smc_sk(new_sk);
|
||||
|
||||
rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0);
|
||||
if (rc) {
|
||||
sock_put(new_sk);
|
||||
*new_smc = NULL;
|
||||
goto out;
|
||||
}
|
||||
|
||||
(*new_smc)->clcsock = new_clcsock;
|
||||
out:
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int smc_listen(struct socket *sock, int backlog)
|
||||
{
|
||||
struct sock *sk = sock->sk;
|
||||
struct smc_sock *smc;
|
||||
int rc;
|
||||
|
||||
smc = smc_sk(sk);
|
||||
lock_sock(sk);
|
||||
|
||||
rc = -EINVAL;
|
||||
if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN))
|
||||
goto out;
|
||||
|
||||
rc = 0;
|
||||
if (sk->sk_state == SMC_LISTEN) {
|
||||
sk->sk_max_ack_backlog = backlog;
|
||||
goto out;
|
||||
}
|
||||
/* some socket options are handled in core, so we could not apply
|
||||
* them to the clc socket -- copy smc socket options to clc socket
|
||||
*/
|
||||
smc_copy_sock_settings_to_clc(smc);
|
||||
|
||||
rc = kernel_listen(smc->clcsock, backlog);
|
||||
if (rc)
|
||||
goto out;
|
||||
sk->sk_max_ack_backlog = backlog;
|
||||
sk->sk_ack_backlog = 0;
|
||||
sk->sk_state = SMC_LISTEN;
|
||||
|
||||
out:
|
||||
release_sock(sk);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int smc_accept(struct socket *sock, struct socket *new_sock,
|
||||
int flags)
|
||||
{
|
||||
struct smc_sock *new_smc;
|
||||
struct sock *sk = sock->sk;
|
||||
struct smc_sock *lsmc;
|
||||
int rc;
|
||||
|
||||
lsmc = smc_sk(sk);
|
||||
lock_sock(sk);
|
||||
|
||||
if (lsmc->sk.sk_state != SMC_LISTEN) {
|
||||
rc = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
|
||||
rc = smc_clcsock_accept(lsmc, &new_smc);
|
||||
if (rc)
|
||||
goto out;
|
||||
sock_graft(&new_smc->sk, new_sock);
|
||||
new_smc->sk.sk_state = SMC_ACTIVE;
|
||||
|
||||
smc_copy_sock_settings_to_smc(new_smc);
|
||||
|
||||
/* always use TCP fallback as transport mechanism for now;
|
||||
* This will change once RDMA transport is implemented
|
||||
*/
|
||||
new_smc->use_fallback = true;
|
||||
|
||||
out:
|
||||
release_sock(sk);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int smc_getname(struct socket *sock, struct sockaddr *addr,
|
||||
int *len, int peer)
|
||||
{
|
||||
struct smc_sock *smc;
|
||||
|
||||
if (peer && (sock->sk->sk_state != SMC_ACTIVE))
|
||||
return -ENOTCONN;
|
||||
|
||||
smc = smc_sk(sock->sk);
|
||||
|
||||
return smc->clcsock->ops->getname(smc->clcsock, addr, len, peer);
|
||||
}
|
||||
|
||||
static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
|
||||
{
|
||||
struct sock *sk = sock->sk;
|
||||
struct smc_sock *smc;
|
||||
int rc = -EPIPE;
|
||||
|
||||
smc = smc_sk(sk);
|
||||
lock_sock(sk);
|
||||
if (sk->sk_state != SMC_ACTIVE)
|
||||
goto out;
|
||||
if (smc->use_fallback)
|
||||
rc = smc->clcsock->ops->sendmsg(smc->clcsock, msg, len);
|
||||
else
|
||||
rc = sock_no_sendmsg(sock, msg, len);
|
||||
out:
|
||||
release_sock(sk);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int smc_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
|
||||
int flags)
|
||||
{
|
||||
struct sock *sk = sock->sk;
|
||||
struct smc_sock *smc;
|
||||
int rc = -ENOTCONN;
|
||||
|
||||
smc = smc_sk(sk);
|
||||
lock_sock(sk);
|
||||
if ((sk->sk_state != SMC_ACTIVE) && (sk->sk_state != SMC_CLOSED))
|
||||
goto out;
|
||||
|
||||
if (smc->use_fallback)
|
||||
rc = smc->clcsock->ops->recvmsg(smc->clcsock, msg, len, flags);
|
||||
else
|
||||
rc = sock_no_recvmsg(sock, msg, len, flags);
|
||||
out:
|
||||
release_sock(sk);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static unsigned int smc_poll(struct file *file, struct socket *sock,
|
||||
poll_table *wait)
|
||||
{
|
||||
struct sock *sk = sock->sk;
|
||||
unsigned int mask = 0;
|
||||
struct smc_sock *smc;
|
||||
|
||||
smc = smc_sk(sock->sk);
|
||||
if ((sk->sk_state == SMC_INIT) || (sk->sk_state == SMC_LISTEN) ||
|
||||
smc->use_fallback) {
|
||||
mask = smc->clcsock->ops->poll(file, smc->clcsock, wait);
|
||||
/* if non-blocking connect finished ... */
|
||||
lock_sock(sk);
|
||||
if ((sk->sk_state == SMC_INIT) && (mask & POLLOUT)) {
|
||||
sk->sk_state = SMC_ACTIVE;
|
||||
/* always use TCP fallback as transport mechanism;
|
||||
* This will change once RDMA transport is implemented
|
||||
*/
|
||||
smc->use_fallback = true;
|
||||
}
|
||||
release_sock(sk);
|
||||
} else {
|
||||
mask = sock_no_poll(file, sock, wait);
|
||||
}
|
||||
|
||||
return mask;
|
||||
}
|
||||
|
||||
static int smc_shutdown(struct socket *sock, int how)
|
||||
{
|
||||
struct sock *sk = sock->sk;
|
||||
struct smc_sock *smc;
|
||||
int rc = -EINVAL;
|
||||
|
||||
smc = smc_sk(sk);
|
||||
|
||||
if ((how < SHUT_RD) || (how > SHUT_RDWR))
|
||||
goto out_err;
|
||||
|
||||
lock_sock(sk);
|
||||
|
||||
rc = -ENOTCONN;
|
||||
if (sk->sk_state == SMC_CLOSED)
|
||||
goto out;
|
||||
if (smc->use_fallback) {
|
||||
rc = kernel_sock_shutdown(smc->clcsock, how);
|
||||
sk->sk_shutdown = smc->clcsock->sk->sk_shutdown;
|
||||
if (sk->sk_shutdown == SHUTDOWN_MASK)
|
||||
sk->sk_state = SMC_CLOSED;
|
||||
} else {
|
||||
rc = sock_no_shutdown(sock, how);
|
||||
}
|
||||
|
||||
out:
|
||||
release_sock(sk);
|
||||
|
||||
out_err:
|
||||
return rc;
|
||||
}
|
||||
|
||||
static int smc_setsockopt(struct socket *sock, int level, int optname,
|
||||
char __user *optval, unsigned int optlen)
|
||||
{
|
||||
struct sock *sk = sock->sk;
|
||||
struct smc_sock *smc;
|
||||
|
||||
smc = smc_sk(sk);
|
||||
|
||||
/* generic setsockopts reaching us here always apply to the
|
||||
* CLC socket
|
||||
*/
|
||||
return smc->clcsock->ops->setsockopt(smc->clcsock, level, optname,
|
||||
optval, optlen);
|
||||
}
|
||||
|
||||
static int smc_getsockopt(struct socket *sock, int level, int optname,
|
||||
char __user *optval, int __user *optlen)
|
||||
{
|
||||
struct smc_sock *smc;
|
||||
|
||||
smc = smc_sk(sock->sk);
|
||||
/* socket options apply to the CLC socket */
|
||||
return smc->clcsock->ops->getsockopt(smc->clcsock, level, optname,
|
||||
optval, optlen);
|
||||
}
|
||||
|
||||
static int smc_ioctl(struct socket *sock, unsigned int cmd,
|
||||
unsigned long arg)
|
||||
{
|
||||
struct smc_sock *smc;
|
||||
|
||||
smc = smc_sk(sock->sk);
|
||||
if (smc->use_fallback)
|
||||
return smc->clcsock->ops->ioctl(smc->clcsock, cmd, arg);
|
||||
else
|
||||
return sock_no_ioctl(sock, cmd, arg);
|
||||
}
|
||||
|
||||
static ssize_t smc_sendpage(struct socket *sock, struct page *page,
|
||||
int offset, size_t size, int flags)
|
||||
{
|
||||
struct sock *sk = sock->sk;
|
||||
struct smc_sock *smc;
|
||||
int rc = -EPIPE;
|
||||
|
||||
smc = smc_sk(sk);
|
||||
lock_sock(sk);
|
||||
if (sk->sk_state != SMC_ACTIVE)
|
||||
goto out;
|
||||
if (smc->use_fallback)
|
||||
rc = kernel_sendpage(smc->clcsock, page, offset,
|
||||
size, flags);
|
||||
else
|
||||
rc = sock_no_sendpage(sock, page, offset, size, flags);
|
||||
|
||||
out:
|
||||
release_sock(sk);
|
||||
return rc;
|
||||
}
|
||||
|
||||
static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
|
||||
struct pipe_inode_info *pipe, size_t len,
|
||||
unsigned int flags)
|
||||
{
|
||||
struct sock *sk = sock->sk;
|
||||
struct smc_sock *smc;
|
||||
int rc = -ENOTCONN;
|
||||
|
||||
smc = smc_sk(sk);
|
||||
lock_sock(sk);
|
||||
if ((sk->sk_state != SMC_ACTIVE) && (sk->sk_state != SMC_CLOSED))
|
||||
goto out;
|
||||
if (smc->use_fallback) {
|
||||
rc = smc->clcsock->ops->splice_read(smc->clcsock, ppos,
|
||||
pipe, len, flags);
|
||||
} else {
|
||||
rc = -EOPNOTSUPP;
|
||||
}
|
||||
out:
|
||||
release_sock(sk);
|
||||
return rc;
|
||||
}
|
||||
|
||||
/* must look like tcp */
|
||||
static const struct proto_ops smc_sock_ops = {
|
||||
.family = PF_SMC,
|
||||
.owner = THIS_MODULE,
|
||||
.release = smc_release,
|
||||
.bind = smc_bind,
|
||||
.connect = smc_connect,
|
||||
.socketpair = sock_no_socketpair,
|
||||
.accept = smc_accept,
|
||||
.getname = smc_getname,
|
||||
.poll = smc_poll,
|
||||
.ioctl = smc_ioctl,
|
||||
.listen = smc_listen,
|
||||
.shutdown = smc_shutdown,
|
||||
.setsockopt = smc_setsockopt,
|
||||
.getsockopt = smc_getsockopt,
|
||||
.sendmsg = smc_sendmsg,
|
||||
.recvmsg = smc_recvmsg,
|
||||
.mmap = sock_no_mmap,
|
||||
.sendpage = smc_sendpage,
|
||||
.splice_read = smc_splice_read,
|
||||
};
|
||||
|
||||
static int smc_create(struct net *net, struct socket *sock, int protocol,
|
||||
int kern)
|
||||
{
|
||||
struct smc_sock *smc;
|
||||
struct sock *sk;
|
||||
int rc;
|
||||
|
||||
rc = -ESOCKTNOSUPPORT;
|
||||
if (sock->type != SOCK_STREAM)
|
||||
goto out;
|
||||
|
||||
rc = -EPROTONOSUPPORT;
|
||||
if ((protocol != IPPROTO_IP) && (protocol != IPPROTO_TCP))
|
||||
goto out;
|
||||
|
||||
rc = -ENOBUFS;
|
||||
sock->ops = &smc_sock_ops;
|
||||
sk = smc_sock_alloc(net, sock);
|
||||
if (!sk)
|
||||
goto out;
|
||||
|
||||
/* create internal TCP socket for CLC handshake and fallback */
|
||||
smc = smc_sk(sk);
|
||||
rc = sock_create_kern(net, PF_INET, SOCK_STREAM,
|
||||
IPPROTO_TCP, &smc->clcsock);
|
||||
if (rc)
|
||||
sk_common_release(sk);
|
||||
|
||||
out:
|
||||
return rc;
|
||||
}
|
||||
|
||||
static const struct net_proto_family smc_sock_family_ops = {
|
||||
.family = PF_SMC,
|
||||
.owner = THIS_MODULE,
|
||||
.create = smc_create,
|
||||
};
|
||||
|
||||
static int __init smc_init(void)
|
||||
{
|
||||
int rc;
|
||||
|
||||
rc = proto_register(&smc_proto, 1);
|
||||
if (rc) {
|
||||
pr_err("%s: proto_register fails with %d\n", __func__, rc);
|
||||
goto out;
|
||||
}
|
||||
|
||||
rc = sock_register(&smc_sock_family_ops);
|
||||
if (rc) {
|
||||
pr_err("%s: sock_register fails with %d\n", __func__, rc);
|
||||
goto out_proto;
|
||||
}
|
||||
|
||||
return 0;
|
||||
|
||||
out_proto:
|
||||
proto_unregister(&smc_proto);
|
||||
out:
|
||||
return rc;
|
||||
}
|
||||
|
||||
static void __exit smc_exit(void)
|
||||
{
|
||||
sock_unregister(PF_SMC);
|
||||
proto_unregister(&smc_proto);
|
||||
}
|
||||
|
||||
module_init(smc_init);
|
||||
module_exit(smc_exit);
|
||||
|
||||
MODULE_AUTHOR("Ursula Braun <ubraun@linux.vnet.ibm.com>");
|
||||
MODULE_DESCRIPTION("smc socket address family");
|
||||
MODULE_LICENSE("GPL");
|
||||
MODULE_ALIAS_NETPROTO(PF_SMC);
|
37
net/smc/smc.h
Normal file
37
net/smc/smc.h
Normal file
|
@ -0,0 +1,37 @@
|
|||
/*
|
||||
* Shared Memory Communications over RDMA (SMC-R) and RoCE
|
||||
*
|
||||
* Definitions for the SMC module (socket related)
|
||||
*
|
||||
* Copyright IBM Corp. 2016
|
||||
*
|
||||
* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
|
||||
*/
|
||||
#ifndef __SMC_H
|
||||
#define __SMC_H
|
||||
|
||||
#include <linux/socket.h>
|
||||
#include <linux/types.h>
|
||||
#include <net/sock.h>
|
||||
|
||||
#define SMCPROTO_SMC 0 /* SMC protocol */
|
||||
|
||||
enum smc_state { /* possible states of an SMC socket */
|
||||
SMC_ACTIVE = 1,
|
||||
SMC_INIT = 2,
|
||||
SMC_CLOSED = 7,
|
||||
SMC_LISTEN = 10,
|
||||
};
|
||||
|
||||
struct smc_sock { /* smc sock container */
|
||||
struct sock sk;
|
||||
struct socket *clcsock; /* internal tcp socket */
|
||||
bool use_fallback; /* fallback to tcp */
|
||||
};
|
||||
|
||||
static inline struct smc_sock *smc_sk(const struct sock *sk)
|
||||
{
|
||||
return (struct smc_sock *)sk;
|
||||
}
|
||||
|
||||
#endif /* __SMC_H */
|
Loading…
Reference in a new issue