Bring in the new iSCSI target and initiator.

Reviewed by:	ken (parts)
Approved by:	re (delphij)
Sponsored by:	FreeBSD Foundation

1 files changed, 397 insertions, 0 deletions

diff --git a/sys/dev/iscsi/icl_proxy.c b/sys/dev/iscsi/icl_proxy.c
new file mode 100644
index 0000000..41e64c3
--- /dev/null
+++ b/sys/dev/iscsi/icl_proxy.c
@@ -0,0 +1,397 @@
+/*-
+ * Copyright (c) 2012 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * This software was developed by Edward Tomasz Napierala under sponsorship
+ * from the FreeBSD Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+/*-
+ * Copyright (c) 1982, 1986, 1989, 1990, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * sendfile(2) and related extensions:
+ * Copyright (c) 1998, David Greenman. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *	@(#)uipc_syscalls.c	8.4 (Berkeley) 2/21/94
+ */
+
+/*
+ * iSCSI Common Layer, kernel proxy part.
+ */
+
+#ifdef ICL_KERNEL_PROXY
+
+#include <sys/param.h>
+#include <sys/capability.h>
+#include <sys/condvar.h>
+#include <sys/conf.h>
+#include <sys/kernel.h>
+#include <sys/kthread.h>
+#include <sys/malloc.h>
+#include <sys/proc.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/sx.h>
+#include <sys/systm.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include <linux/types.h>
+#include <rdma/rdma_cm.h>
+
+#include "icl.h"
+
+static int debug = 1;
+
+#define	ICL_DEBUG(X, ...)					\
+	if (debug > 1) {					\
+		printf("%s: " X "\n", __func__, ## __VA_ARGS__);\
+	} while (0)
+
+#define	ICL_WARN(X, ...)					\
+	if (debug > 0) {					\
+		printf("WARNING: %s: " X "\n",			\
+		    __func__, ## __VA_ARGS__);			\
+	} while (0)
+
+static MALLOC_DEFINE(M_ICL_PROXY, "ICL_PROXY", "iSCSI common layer proxy");
+
+#ifdef ICL_RDMA
+static int	icl_conn_connect_rdma(struct icl_conn *ic, int domain, int socktype,
+    int protocol, struct sockaddr *from_sa, struct sockaddr *to_sa);
+static int	icl_listen_add_rdma(struct icl_listen *il, int domain, int socktype, int protocol,
+    struct sockaddr *sa);
+#endif /* ICL_RDMA */
+
+static int
+icl_conn_connect_tcp(struct icl_conn *ic, int domain, int socktype,
+    int protocol, struct sockaddr *from_sa, struct sockaddr *to_sa)
+{
+	struct socket *so;
+	int error;
+	int interrupted = 0;
+
+	error = socreate(domain, &so, socktype, protocol,
+	    curthread->td_ucred, curthread);
+	if (error != 0)
+		return (error);
+
+	if (from_sa != NULL) {
+		error = sobind(so, from_sa, curthread);
+		if (error != 0) {
+			soclose(so);
+			return (error);
+		}
+	}
+
+	error = soconnect(so, to_sa, curthread);
+	if (error != 0) {
+		soclose(so);
+		return (error);
+	}
+
+	SOCK_LOCK(so);
+	while ((so->so_state & SS_ISCONNECTING) && so->so_error == 0) {
+		error = msleep(&so->so_timeo, SOCK_MTX(so), PSOCK | PCATCH,
+		    "icl_connect", 0);
+		if (error) {
+			if (error == EINTR || error == ERESTART)
+				interrupted = 1;
+			break;
+		}
+	}
+	if (error == 0) {
+		error = so->so_error;
+		so->so_error = 0;
+	}
+	SOCK_UNLOCK(so);
+
+	if (error != 0) {
+		soclose(so);
+		return (error);
+	}
+
+	error = icl_conn_handoff_sock(ic, so);
+	if (error != 0)
+		soclose(so);
+
+	return (error);
+}
+
+int
+icl_conn_connect(struct icl_conn *ic, bool rdma, int domain, int socktype,
+    int protocol, struct sockaddr *from_sa, struct sockaddr *to_sa)
+{
+
+	if (rdma) {
+#ifdef ICL_RDMA
+		return (icl_conn_connect_rdma(ic, domain, socktype, protocol, from_sa, to_sa));
+#else
+		ICL_DEBUG("RDMA not supported");
+		return (EOPNOTSUPP);
+#endif
+	}
+
+	return (icl_conn_connect_tcp(ic, domain, socktype, protocol, from_sa, to_sa));
+}
+
+struct icl_listen *
+icl_listen_new(void (*accept_cb)(struct socket *))
+{
+	struct icl_listen *il;
+
+	il = malloc(sizeof(*il), M_ICL_PROXY, M_ZERO | M_WAITOK);
+	TAILQ_INIT(&il->il_sockets);
+	sx_init(&il->il_lock, "icl_listen");
+	il->il_accept = accept_cb;
+
+	return (il);
+}
+
+void
+icl_listen_free(struct icl_listen *il)
+{
+	struct icl_listen_sock *ils;
+
+	sx_xlock(&il->il_lock);
+	while (!TAILQ_EMPTY(&il->il_sockets)) {
+		ils = TAILQ_FIRST(&il->il_sockets);
+		while (ils->ils_running) {
+			ICL_DEBUG("waiting for accept thread to terminate");
+			sx_xunlock(&il->il_lock);
+			ils->ils_disconnecting = true;
+			wakeup(&ils->ils_socket->so_timeo);
+			pause("icl_unlisten", 1 * hz);
+			sx_xlock(&il->il_lock);
+		}
+	
+		TAILQ_REMOVE(&il->il_sockets, ils, ils_next);
+		soclose(ils->ils_socket);
+		free(ils, M_ICL_PROXY);
+	}
+	sx_xunlock(&il->il_lock);
+
+	free(il, M_ICL_PROXY);
+}
+
+/*
+ * XXX: Doing accept in a separate thread in each socket might not be the best way
+ * 	to do stuff, but it's pretty clean and debuggable - and you probably won't
+ * 	have hundreds of listening sockets anyway.
+ */
+static void
+icl_accept_thread(void *arg)
+{
+	struct icl_listen_sock *ils;
+	struct socket *head, *so;
+	struct sockaddr *sa;
+	int error;
+
+	ils = arg;
+	head = ils->ils_socket;
+
+	ils->ils_running = true;
+
+	for (;;) {
+		ACCEPT_LOCK();
+		while (TAILQ_EMPTY(&head->so_comp) && head->so_error == 0 && ils->ils_disconnecting == false) {
+			if (head->so_rcv.sb_state & SBS_CANTRCVMORE) {
+				head->so_error = ECONNABORTED;
+				break;
+			}
+			error = msleep(&head->so_timeo, &accept_mtx, PSOCK | PCATCH,
+			    "accept", 0);
+			if (error) {
+				ACCEPT_UNLOCK();
+				ICL_WARN("msleep failed with error %d", error);
+				continue;
+			}
+			if (ils->ils_disconnecting) {
+				ACCEPT_UNLOCK();
+				ICL_DEBUG("terminating");
+				ils->ils_running = false;
+				kthread_exit();
+				return;
+			}
+		}
+		if (head->so_error) {
+			error = head->so_error;
+			head->so_error = 0;
+			ACCEPT_UNLOCK();
+			ICL_WARN("socket error %d", error);
+			continue;
+		}
+		so = TAILQ_FIRST(&head->so_comp);
+		KASSERT(so != NULL, ("NULL so"));
+		KASSERT(!(so->so_qstate & SQ_INCOMP), ("accept1: so SQ_INCOMP"));
+		KASSERT(so->so_qstate & SQ_COMP, ("accept1: so not SQ_COMP"));
+
+		/*
+		 * Before changing the flags on the socket, we have to bump the
+		 * reference count.  Otherwise, if the protocol calls sofree(),
+		 * the socket will be released due to a zero refcount.
+		 */
+		SOCK_LOCK(so);			/* soref() and so_state update */
+		soref(so);			/* file descriptor reference */
+
+		TAILQ_REMOVE(&head->so_comp, so, so_list);
+		head->so_qlen--;
+		so->so_state |= (head->so_state & SS_NBIO);
+		so->so_qstate &= ~SQ_COMP;
+		so->so_head = NULL;
+
+		SOCK_UNLOCK(so);
+		ACCEPT_UNLOCK();
+
+		sa = NULL;
+		error = soaccept(so, &sa);
+		if (error != 0) {
+			ICL_WARN("soaccept error %d", error);
+			if (sa != NULL)
+				free(sa, M_SONAME);
+			soclose(so);
+		}
+
+		(ils->ils_listen->il_accept)(so);
+	}
+}
+
+static int
+icl_listen_add_tcp(struct icl_listen *il, int domain, int socktype, int protocol,
+    struct sockaddr *sa)
+{
+	struct icl_listen_sock *ils;
+	struct socket *so;
+	struct sockopt sopt;
+	int error, one = 1;
+
+	error = socreate(domain, &so, socktype, protocol,
+	    curthread->td_ucred, curthread);
+	if (error != 0) {
+		ICL_WARN("socreate failed with error %d", error);
+		return (error);
+	}
+
+	sopt.sopt_dir = SOPT_SET;
+	sopt.sopt_level = SOL_SOCKET;
+	sopt.sopt_name = SO_REUSEADDR;
+	sopt.sopt_val = &one;
+	sopt.sopt_valsize = sizeof(one);
+	sopt.sopt_td = NULL;
+	error = sosetopt(so, &sopt);
+	if (error != 0) {
+		ICL_WARN("failed to set SO_REUSEADDR with error %d", error);
+		soclose(so);
+		return (error);
+	}
+
+	error = sobind(so, sa, curthread);
+	if (error != 0) {
+		ICL_WARN("sobind failed with error %d", error);
+		soclose(so);
+		return (error);
+	}
+
+	error = solisten(so, -1, curthread);
+	if (error != 0) {
+		ICL_WARN("solisten failed with error %d", error);
+		soclose(so);
+		return (error);
+	}
+
+	ils = malloc(sizeof(*ils), M_ICL_PROXY, M_ZERO | M_WAITOK);
+	ils->ils_listen = il;
+	ils->ils_socket = so;
+
+	error = kthread_add(icl_accept_thread, ils, NULL, NULL, 0, 0, "iclacc");
+	if (error != 0) {
+		ICL_WARN("kthread_add failed with error %d", error);
+		soclose(so);
+		free(ils, M_ICL_PROXY);
+
+		return (error);
+	}
+
+	sx_xlock(&il->il_lock);
+	TAILQ_INSERT_TAIL(&il->il_sockets, ils, ils_next);
+	sx_xunlock(&il->il_lock);
+
+	return (0);
+}
+
+int
+icl_listen_add(struct icl_listen *il, bool rdma, int domain, int socktype, int protocol,
+    struct sockaddr *sa)
+{
+
+	if (rdma) {
+#ifndef ICL_RDMA
+		ICL_DEBUG("RDMA not supported");
+		return (EOPNOTSUPP);
+#else
+		return (icl_listen_add_rdma(il, domain, socktype, protocol, sa));
+#endif
+	}
+
+
+	return (icl_listen_add_tcp(il, domain, socktype, protocol, sa));
+}
+
+int
+icl_listen_remove(struct icl_listen *il, struct sockaddr *sa)
+{
+
+	/*
+	 * XXX
+	 */
+
+	return (EOPNOTSUPP);
+}
+
+#endif /* ICL_KERNEL_PROXY */