Move tcp connection code from user- into kernel-space.
This makes it possible to do TCP reconnect deadlock free.
(This patch requires userspace changes too)
Signed-off-by: Mike Christie <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
---
drivers/scsi/iscsi_tcp.c | 108 ++++++++++++++++++++++++++++++++++++-----------
1 file changed, 83 insertions(+), 25 deletions(-)
Index: linux-2.6/drivers/scsi/iscsi_tcp.c
===================================================================
--- linux-2.6.orig/drivers/scsi/iscsi_tcp.c 2006-09-07 16:00:16.000000000 +0200
+++ linux-2.6/drivers/scsi/iscsi_tcp.c 2006-09-07 19:32:56.000000000 +0200
@@ -35,6 +35,8 @@
#include <linux/kfifo.h>
#include <linux/scatterlist.h>
#include <linux/mutex.h>
+#include <linux/syscalls.h>
+#include <linux/file.h>
#include <net/tcp.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_host.h>
@@ -1062,21 +1064,6 @@ iscsi_conn_set_callbacks(struct iscsi_co
write_unlock_bh(&sk->sk_callback_lock);
}
-static void
-iscsi_conn_restore_callbacks(struct iscsi_tcp_conn *tcp_conn)
-{
- struct sock *sk = tcp_conn->sock->sk;
-
- /* restore socket callbacks, see also: iscsi_conn_set_callbacks() */
- write_lock_bh(&sk->sk_callback_lock);
- sk->sk_user_data = NULL;
- sk->sk_data_ready = tcp_conn->old_data_ready;
- sk->sk_state_change = tcp_conn->old_state_change;
- sk->sk_write_space = tcp_conn->old_write_space;
- sk->sk_no_check = 0;
- write_unlock_bh(&sk->sk_callback_lock);
-}
-
/**
* iscsi_send - generic send routine
* @sk: kernel's socket
@@ -1741,6 +1728,77 @@ iscsi_tcp_ctask_xmit(struct iscsi_conn *
return rc;
}
+static int
+iscsi_tcp_ep_connect(struct sockaddr *dst_addr, int non_blocking,
+ uint64_t *ep_handle)
+{
+ struct socket *sock;
+ int rc, size, arg = 1, window = 524288;
+
+ rc = sock_create_kern(dst_addr->sa_family, SOCK_STREAM, IPPROTO_TCP,
+ &sock);
+ if (rc < 0) {
+ printk(KERN_ERR "Could not create socket %d.\n", rc);
+ return rc;
+ }
+ sock->sk->sk_allocation = GFP_ATOMIC;
+/*
+ rc = sock->ops->setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
+ (char __user *)&arg, sizeof(arg));
+ if (rc) {
+ printk(KERN_ERR "Could not set TCP_NODELAY %d\n", rc);
+ goto release_sock;
+ }
+*/
+ /* should set like nfs */
+ sock_setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
+ (char __user *)&window, sizeof(window));
+ sock_setsockopt(sock, SOL_SOCKET, SO_SNDBUF,
+ (char __user *)&window, sizeof(window));
+
+ if (dst_addr->sa_family == PF_INET)
+ size = sizeof(struct sockaddr_in);
+ else if (dst_addr->sa_family == PF_INET6)
+ size = sizeof(struct sockaddr_in6);
+ else {
+ rc = -EINVAL;
+ goto release_sock;
+ }
+
+ /* TODO we cannot block here */
+ rc = sock->ops->connect(sock, (struct sockaddr *)dst_addr, size,
+ 0 /*O_NONBLOCK*/);
+ if (rc == -EINPROGRESS)
+ rc = 0;
+ else if (rc) {
+ printk(KERN_ERR "Could not connect %d\n", rc);
+ goto release_sock;
+ }
+
+ rc = sock_map_fd(sock);
+ if (rc < 0)
+ goto release_sock;
+ *ep_handle = (uint64_t)rc;
+ return 0;
+
+release_sock:
+ sock_release(sock);
+ return rc;
+}
+
+static int
+iscsi_tcp_ep_poll(uint64_t ep_handle, int timeout_ms)
+{
+ /* we cheated and blocked on the connect (TODO must fix) */
+ return 1;
+}
+
+static void
+iscsi_tcp_ep_disconnect(uint64_t ep_handle)
+{
+ sys_close(ep_handle);
+}
+
static struct iscsi_cls_conn *
iscsi_tcp_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
{
@@ -1795,11 +1853,7 @@ iscsi_tcp_release_conn(struct iscsi_conn
if (!tcp_conn->sock)
return;
- sock_hold(tcp_conn->sock->sk);
- iscsi_conn_restore_callbacks(tcp_conn);
- sock_put(tcp_conn->sock->sk);
-
- sock_release(tcp_conn->sock);
+ fput(tcp_conn->sock->file);
tcp_conn->sock = NULL;
conn->recv_lock = NULL;
}
@@ -1856,10 +1910,13 @@ iscsi_tcp_conn_bind(struct iscsi_cls_ses
printk(KERN_ERR "iscsi_tcp: sockfd_lookup failed %d\n", err);
return -EEXIST;
}
+ get_file(sock->file);
err = iscsi_conn_bind(cls_session, cls_conn, is_leading);
- if (err)
+ if (err) {
+ fput(sock->file);
return err;
+ }
/* bind iSCSI connection and socket */
tcp_conn->sock = sock;
@@ -2041,13 +2098,11 @@ iscsi_tcp_conn_get_param(struct iscsi_cl
sk = tcp_conn->sock->sk;
if (sk->sk_family == PF_INET) {
inet = inet_sk(sk);
- len = sprintf(buf, "%u.%u.%u.%u\n",
+ len = sprintf(buf, NIPQUAD_FMT "\n",
NIPQUAD(inet->daddr));
} else {
np = inet6_sk(sk);
- len = sprintf(buf,
- "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
- NIP6(np->daddr));
+ len = sprintf(buf, NIP6_FMT "\n", NIP6(np->daddr));
}
mutex_unlock(&conn->xmitmutex);
break;
@@ -2185,6 +2240,9 @@ static struct iscsi_transport iscsi_tcp_
.get_session_param = iscsi_session_get_param,
.start_conn = iscsi_conn_start,
.stop_conn = iscsi_tcp_conn_stop,
+ .ep_connect = iscsi_tcp_ep_connect,
+ .ep_poll = iscsi_tcp_ep_poll,
+ .ep_disconnect = iscsi_tcp_ep_disconnect,
/* IO */
.send_pdu = iscsi_conn_send_pdu,
.get_stats = iscsi_conn_get_stats,
--
-
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