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>zero-colors
Ursula Braun
David S. Miller
parent
4b9d07a440
commit
ac7138746e
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@ -10850,6 +10850,13 @@ S: Maintained
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F: drivers/staging/media/st-cec/
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F: Documentation/devicetree/bindings/media/stih-cec.txt
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SHARED MEMORY COMMUNICATIONS (SMC) SOCKETS
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M: Ursula Braun <ubraun@linux.vnet.ibm.com>
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L: linux-s390@vger.kernel.org
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W: http://www.ibm.com/developerworks/linux/linux390/
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S: Supported
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F: net/smc/
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SYNOPSYS DESIGNWARE DMAC DRIVER
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M: Viresh Kumar <vireshk@kernel.org>
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M: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
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@ -202,8 +202,12 @@ struct ucred {
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#define AF_VSOCK 40 /* vSockets */
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#define AF_KCM 41 /* Kernel Connection Multiplexor*/
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#define AF_QIPCRTR 42 /* Qualcomm IPC Router */
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#define AF_SMC 43 /* smc sockets: reserve number for
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* PF_SMC protocol family that
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* reuses AF_INET address family
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*/
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#define AF_MAX 43 /* For now.. */
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#define AF_MAX 44 /* For now.. */
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/* Protocol families, same as address families. */
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#define PF_UNSPEC AF_UNSPEC
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@ -251,6 +255,7 @@ struct ucred {
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#define PF_VSOCK AF_VSOCK
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#define PF_KCM AF_KCM
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#define PF_QIPCRTR AF_QIPCRTR
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#define PF_SMC AF_SMC
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#define PF_MAX AF_MAX
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/* Maximum queue length specifiable by listen. */
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@ -57,6 +57,7 @@ source "net/packet/Kconfig"
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source "net/unix/Kconfig"
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source "net/xfrm/Kconfig"
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source "net/iucv/Kconfig"
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source "net/smc/Kconfig"
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config INET
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bool "TCP/IP networking"
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@ -51,6 +51,7 @@ obj-$(CONFIG_MAC80211) += mac80211/
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obj-$(CONFIG_TIPC) += tipc/
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obj-$(CONFIG_NETLABEL) += netlabel/
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obj-$(CONFIG_IUCV) += iucv/
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obj-$(CONFIG_SMC) += smc/
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obj-$(CONFIG_RFKILL) += rfkill/
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obj-$(CONFIG_NET_9P) += 9p/
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obj-$(CONFIG_CAIF) += caif/
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@ -222,7 +222,7 @@ static const char *const af_family_key_strings[AF_MAX+1] = {
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"sk_lock-AF_RXRPC" , "sk_lock-AF_ISDN" , "sk_lock-AF_PHONET" ,
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"sk_lock-AF_IEEE802154", "sk_lock-AF_CAIF" , "sk_lock-AF_ALG" ,
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"sk_lock-AF_NFC" , "sk_lock-AF_VSOCK" , "sk_lock-AF_KCM" ,
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"sk_lock-AF_MAX"
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"sk_lock-AF_SMC" , "sk_lock-AF_MAX"
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};
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static const char *const af_family_slock_key_strings[AF_MAX+1] = {
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"slock-AF_UNSPEC", "slock-AF_UNIX" , "slock-AF_INET" ,
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@ -239,7 +239,7 @@ static const char *const af_family_slock_key_strings[AF_MAX+1] = {
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"slock-AF_RXRPC" , "slock-AF_ISDN" , "slock-AF_PHONET" ,
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"slock-AF_IEEE802154", "slock-AF_CAIF" , "slock-AF_ALG" ,
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"slock-AF_NFC" , "slock-AF_VSOCK" ,"slock-AF_KCM" ,
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"slock-AF_MAX"
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"slock-AF_SMC" , "slock-AF_MAX"
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};
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static const char *const af_family_clock_key_strings[AF_MAX+1] = {
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"clock-AF_UNSPEC", "clock-AF_UNIX" , "clock-AF_INET" ,
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@ -256,7 +256,7 @@ static const char *const af_family_clock_key_strings[AF_MAX+1] = {
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"clock-AF_RXRPC" , "clock-AF_ISDN" , "clock-AF_PHONET" ,
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"clock-AF_IEEE802154", "clock-AF_CAIF" , "clock-AF_ALG" ,
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"clock-AF_NFC" , "clock-AF_VSOCK" , "clock-AF_KCM" ,
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"clock-AF_MAX"
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"closck-AF_smc" , "clock-AF_MAX"
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};
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/*
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@ -0,0 +1,11 @@
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config SMC
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tristate "SMC socket protocol family"
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depends on INET && INFINIBAND
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---help---
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SMC-R provides a "sockets over RDMA" solution making use of
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RDMA over Converged Ethernet (RoCE) technology to upgrade
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AF_INET TCP connections transparently.
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The Linux implementation of the SMC-R solution is designed as
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a separate socket family SMC.
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Select this option if you want to run SMC socket applications
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@ -0,0 +1,2 @@
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obj-$(CONFIG_SMC) += smc.o
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smc-y := af_smc.o
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@ -0,0 +1,620 @@
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/*
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* Shared Memory Communications over RDMA (SMC-R) and RoCE
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*
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* AF_SMC protocol family socket handler keeping the AF_INET sock address type
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* applies to SOCK_STREAM sockets only
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* offers an alternative communication option for TCP-protocol sockets
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* applicable with RoCE-cards only
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*
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* Copyright IBM Corp. 2016
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*
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* Author(s): Ursula Braun <ubraun@linux.vnet.ibm.com>
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* based on prototype from Frank Blaschka
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*/
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#define KMSG_COMPONENT "smc"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/module.h>
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#include <linux/socket.h>
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#include <net/sock.h>
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#include "smc.h"
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static void smc_set_keepalive(struct sock *sk, int val)
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{
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struct smc_sock *smc = smc_sk(sk);
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smc->clcsock->sk->sk_prot->keepalive(smc->clcsock->sk, val);
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}
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static struct proto smc_proto = {
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.name = "SMC",
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.owner = THIS_MODULE,
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.keepalive = smc_set_keepalive,
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.obj_size = sizeof(struct smc_sock),
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.slab_flags = SLAB_DESTROY_BY_RCU,
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};
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static int smc_release(struct socket *sock)
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{
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struct sock *sk = sock->sk;
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struct smc_sock *smc;
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if (!sk)
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goto out;
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smc = smc_sk(sk);
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lock_sock(sk);
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sk->sk_state = SMC_CLOSED;
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if (smc->clcsock) {
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sock_release(smc->clcsock);
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smc->clcsock = NULL;
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}
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/* detach socket */
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sock_orphan(sk);
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sock->sk = NULL;
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release_sock(sk);
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sock_put(sk);
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out:
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return 0;
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}
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static void smc_destruct(struct sock *sk)
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{
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if (sk->sk_state != SMC_CLOSED)
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return;
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if (!sock_flag(sk, SOCK_DEAD))
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return;
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sk_refcnt_debug_dec(sk);
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}
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static struct sock *smc_sock_alloc(struct net *net, struct socket *sock)
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{
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struct smc_sock *smc;
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struct sock *sk;
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sk = sk_alloc(net, PF_SMC, GFP_KERNEL, &smc_proto, 0);
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if (!sk)
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return NULL;
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sock_init_data(sock, sk); /* sets sk_refcnt to 1 */
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sk->sk_state = SMC_INIT;
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sk->sk_destruct = smc_destruct;
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sk->sk_protocol = SMCPROTO_SMC;
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sk_refcnt_debug_inc(sk);
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smc = smc_sk(sk);
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return sk;
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}
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static int smc_bind(struct socket *sock, struct sockaddr *uaddr,
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int addr_len)
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{
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struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
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struct sock *sk = sock->sk;
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struct smc_sock *smc;
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int rc;
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smc = smc_sk(sk);
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/* replicate tests from inet_bind(), to be safe wrt. future changes */
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rc = -EINVAL;
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if (addr_len < sizeof(struct sockaddr_in))
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goto out;
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rc = -EAFNOSUPPORT;
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/* accept AF_UNSPEC (mapped to AF_INET) only if s_addr is INADDR_ANY */
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if ((addr->sin_family != AF_INET) &&
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((addr->sin_family != AF_UNSPEC) ||
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(addr->sin_addr.s_addr != htonl(INADDR_ANY))))
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goto out;
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lock_sock(sk);
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/* Check if socket is already active */
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rc = -EINVAL;
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if (sk->sk_state != SMC_INIT)
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goto out_rel;
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smc->clcsock->sk->sk_reuse = sk->sk_reuse;
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rc = kernel_bind(smc->clcsock, uaddr, addr_len);
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out_rel:
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release_sock(sk);
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out:
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return rc;
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}
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static void smc_copy_sock_settings(struct sock *nsk, struct sock *osk,
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unsigned long mask)
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{
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/* options we don't get control via setsockopt for */
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nsk->sk_type = osk->sk_type;
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nsk->sk_sndbuf = osk->sk_sndbuf;
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nsk->sk_rcvbuf = osk->sk_rcvbuf;
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nsk->sk_sndtimeo = osk->sk_sndtimeo;
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nsk->sk_rcvtimeo = osk->sk_rcvtimeo;
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nsk->sk_mark = osk->sk_mark;
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nsk->sk_priority = osk->sk_priority;
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nsk->sk_rcvlowat = osk->sk_rcvlowat;
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nsk->sk_bound_dev_if = osk->sk_bound_dev_if;
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nsk->sk_err = osk->sk_err;
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nsk->sk_flags &= ~mask;
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nsk->sk_flags |= osk->sk_flags & mask;
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}
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#define SK_FLAGS_SMC_TO_CLC ((1UL << SOCK_URGINLINE) | \
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(1UL << SOCK_KEEPOPEN) | \
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(1UL << SOCK_LINGER) | \
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(1UL << SOCK_BROADCAST) | \
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(1UL << SOCK_TIMESTAMP) | \
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(1UL << SOCK_DBG) | \
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(1UL << SOCK_RCVTSTAMP) | \
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(1UL << SOCK_RCVTSTAMPNS) | \
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(1UL << SOCK_LOCALROUTE) | \
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(1UL << SOCK_TIMESTAMPING_RX_SOFTWARE) | \
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(1UL << SOCK_RXQ_OVFL) | \
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(1UL << SOCK_WIFI_STATUS) | \
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(1UL << SOCK_NOFCS) | \
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(1UL << SOCK_FILTER_LOCKED))
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/* copy only relevant settings and flags of SOL_SOCKET level from smc to
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* clc socket (since smc is not called for these options from net/core)
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*/
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static void smc_copy_sock_settings_to_clc(struct smc_sock *smc)
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{
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smc_copy_sock_settings(smc->clcsock->sk, &smc->sk, SK_FLAGS_SMC_TO_CLC);
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}
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#define SK_FLAGS_CLC_TO_SMC ((1UL << SOCK_URGINLINE) | \
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(1UL << SOCK_KEEPOPEN) | \
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(1UL << SOCK_LINGER) | \
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(1UL << SOCK_DBG))
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/* copy only settings and flags relevant for smc from clc to smc socket */
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static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
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{
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smc_copy_sock_settings(&smc->sk, smc->clcsock->sk, SK_FLAGS_CLC_TO_SMC);
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}
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static int smc_connect(struct socket *sock, struct sockaddr *addr,
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int alen, int flags)
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{
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struct sock *sk = sock->sk;
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struct smc_sock *smc;
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int rc = -EINVAL;
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smc = smc_sk(sk);
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/* separate smc parameter checking to be safe */
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if (alen < sizeof(addr->sa_family))
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goto out_err;
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if (addr->sa_family != AF_INET)
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goto out_err;
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lock_sock(sk);
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switch (sk->sk_state) {
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default:
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goto out;
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case SMC_ACTIVE:
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rc = -EISCONN;
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goto out;
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case SMC_INIT:
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rc = 0;
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break;
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}
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smc_copy_sock_settings_to_clc(smc);
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rc = kernel_connect(smc->clcsock, addr, alen, flags);
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if (rc)
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goto out;
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sk->sk_state = SMC_ACTIVE;
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/* always use TCP fallback as transport mechanism for now;
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* This will change once RDMA transport is implemented
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*/
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smc->use_fallback = true;
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out:
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release_sock(sk);
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out_err:
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return rc;
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}
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static int smc_clcsock_accept(struct smc_sock *lsmc, struct smc_sock **new_smc)
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{
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struct sock *sk = &lsmc->sk;
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struct socket *new_clcsock;
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struct sock *new_sk;
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int rc;
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new_sk = smc_sock_alloc(sock_net(sk), NULL);
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if (!new_sk) {
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rc = -ENOMEM;
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lsmc->sk.sk_err = ENOMEM;
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*new_smc = NULL;
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goto out;
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}
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*new_smc = smc_sk(new_sk);
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rc = kernel_accept(lsmc->clcsock, &new_clcsock, 0);
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if (rc) {
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sock_put(new_sk);
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*new_smc = NULL;
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goto out;
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}
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(*new_smc)->clcsock = new_clcsock;
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out:
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return rc;
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}
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static int smc_listen(struct socket *sock, int backlog)
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{
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struct sock *sk = sock->sk;
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struct smc_sock *smc;
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int rc;
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smc = smc_sk(sk);
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lock_sock(sk);
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rc = -EINVAL;
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if ((sk->sk_state != SMC_INIT) && (sk->sk_state != SMC_LISTEN))
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goto out;
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rc = 0;
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if (sk->sk_state == SMC_LISTEN) {
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sk->sk_max_ack_backlog = backlog;
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goto out;
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}
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/* some socket options are handled in core, so we could not apply
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* them to the clc socket -- copy smc socket options to clc socket
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*/
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smc_copy_sock_settings_to_clc(smc);
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rc = kernel_listen(smc->clcsock, backlog);
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if (rc)
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goto out;
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sk->sk_max_ack_backlog = backlog;
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sk->sk_ack_backlog = 0;
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sk->sk_state = SMC_LISTEN;
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out:
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release_sock(sk);
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return rc;
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}
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static int smc_accept(struct socket *sock, struct socket *new_sock,
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int flags)
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{
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struct smc_sock *new_smc;
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struct sock *sk = sock->sk;
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struct smc_sock *lsmc;
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int rc;
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lsmc = smc_sk(sk);
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lock_sock(sk);
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if (lsmc->sk.sk_state != SMC_LISTEN) {
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rc = -EINVAL;
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goto out;
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}
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rc = smc_clcsock_accept(lsmc, &new_smc);
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if (rc)
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goto out;
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sock_graft(&new_smc->sk, new_sock);
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new_smc->sk.sk_state = SMC_ACTIVE;
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smc_copy_sock_settings_to_smc(new_smc);
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/* always use TCP fallback as transport mechanism for now;
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* This will change once RDMA transport is implemented
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*/
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new_smc->use_fallback = true;
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out:
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release_sock(sk);
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return rc;
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}
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static int smc_getname(struct socket *sock, struct sockaddr *addr,
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int *len, int peer)
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{
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struct smc_sock *smc;
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|
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if (peer && (sock->sk->sk_state != SMC_ACTIVE))
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return -ENOTCONN;
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smc = smc_sk(sock->sk);
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return smc->clcsock->ops->getname(smc->clcsock, addr, len, peer);
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}
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static int smc_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
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{
|
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struct sock *sk = sock->sk;
|
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struct smc_sock *smc;
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int rc = -EPIPE;
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smc = smc_sk(sk);
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lock_sock(sk);
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if (sk->sk_state != SMC_ACTIVE)
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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);
|
||||
|
|
@ -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 New Issue