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[SCSI] scsi_transport_iscsi: Add conn login, kernel to user, event to support offload session login.

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Offload drivers like qla4xxx will offload the sending of the login/logout
pdus still, so this patch adds iscsi_conn_login_event which is
used by these types of drivers to notify userspace that the connection
has changed state.

It also adds a iscsi_is_session_online helper so the lld
can query the sessions state field.

Signed-off-by: Manish Rangankar <manish.rangankar@qlogic.com>
Signed-off-by: Lalit Chandivade <lalit.chandivade@qlogic.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Manish Rangankar 2011-07-25 13:48:52 -05:00 committed by James Bottomley
parent a355943ca8
commit 17fa575eec
3 changed files with 67 additions and 0 deletions
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47
drivers/scsi/scsi_transport_iscsi.c
View File

@ -693,6 +693,19 @@ int iscsi_session_chkready(struct iscsi_cls_session *session)
}
EXPORT_SYMBOL_GPL(iscsi_session_chkready);
int iscsi_is_session_online(struct iscsi_cls_session *session)
{
unsigned long flags;
int ret = 0;
spin_lock_irqsave(&session->lock, flags);
if (session->state == ISCSI_SESSION_LOGGED_IN)
ret = 1;
spin_unlock_irqrestore(&session->lock, flags);
return ret;
}
EXPORT_SYMBOL_GPL(iscsi_is_session_online);
static void iscsi_session_release(struct device *dev)
{
struct iscsi_cls_session *session = iscsi_dev_to_session(dev);
@ -1433,6 +1446,40 @@ void iscsi_conn_error_event(struct iscsi_cls_conn *conn, enum iscsi_err error)
}
EXPORT_SYMBOL_GPL(iscsi_conn_error_event);
void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
enum iscsi_conn_state state)
{
struct nlmsghdr *nlh;
struct sk_buff *skb;
struct iscsi_uevent *ev;
struct iscsi_internal *priv;
int len = NLMSG_SPACE(sizeof(*ev));
priv = iscsi_if_transport_lookup(conn->transport);
if (!priv)
return;
skb = alloc_skb(len, GFP_ATOMIC);
if (!skb) {
iscsi_cls_conn_printk(KERN_ERR, conn, "gracefully ignored "
"conn login (%d)\n", state);
return;
}
nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
ev = NLMSG_DATA(nlh);
ev->transport_handle = iscsi_handle(conn->transport);
ev->type = ISCSI_KEVENT_CONN_LOGIN_STATE;
ev->r.conn_login.state = state;
ev->r.conn_login.cid = conn->cid;
ev->r.conn_login.sid = iscsi_conn_get_sid(conn);
iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_ATOMIC);
iscsi_cls_conn_printk(KERN_INFO, conn, "detected conn login (%d)\n",
state);
}
EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
static int
iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
void *payload, int size)

17
include/scsi/iscsi_if.h
View File

@ -71,6 +71,7 @@ enum iscsi_uevent_e {
ISCSI_KEVENT_PATH_REQ = KEVENT_BASE + 7,
ISCSI_KEVENT_IF_DOWN = KEVENT_BASE + 8,
ISCSI_KEVENT_CONN_LOGIN_STATE = KEVENT_BASE + 9,
};
enum iscsi_tgt_dscvr {
@ -198,6 +199,11 @@ struct iscsi_uevent {
uint32_t cid;
uint64_t recv_handle;
} recv_req;
struct msg_conn_login {
uint32_t sid;
uint32_t cid;
uint32_t state; /* enum iscsi_conn_state */
} conn_login;
struct msg_conn_error {
uint32_t sid;
uint32_t cid;
@ -309,6 +315,16 @@ enum iscsi_net_param {
ISCSI_NET_PARAM_IFACE_NAME = 17,
};
enum iscsi_conn_state {
ISCSI_CONN_STATE_FREE,
ISCSI_CONN_STATE_XPT_WAIT,
ISCSI_CONN_STATE_IN_LOGIN,
ISCSI_CONN_STATE_LOGGED_IN,
ISCSI_CONN_STATE_IN_LOGOUT,
ISCSI_CONN_STATE_LOGOUT_REQUESTED,
ISCSI_CONN_STATE_CLEANUP_WAIT,
};
/*
* Common error codes
*/
@ -421,6 +437,7 @@ enum iscsi_host_param {
#define CAP_DIGEST_OFFLOAD 0x1000 /* offload hdr and data digests */
#define CAP_PADDING_OFFLOAD 0x2000 /* offload padding insertion, removal,
and verification */
#define CAP_LOGIN_OFFLOAD 0x4000 /* offload session login */
/*
* These flags describes reason of stop_conn() call

3
include/scsi/scsi_transport_iscsi.h
View File

@ -156,6 +156,8 @@ extern int iscsi_unregister_transport(struct iscsi_transport *tt);
*/
extern void iscsi_conn_error_event(struct iscsi_cls_conn *conn,
enum iscsi_err error);
extern void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
enum iscsi_conn_state state);
extern int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
char *data, uint32_t data_size);
@ -268,6 +270,7 @@ struct iscsi_iface {
dev_printk(prefix, &(_cls_conn)->dev, fmt, ##a)
extern int iscsi_session_chkready(struct iscsi_cls_session *session);
extern int iscsi_is_session_online(struct iscsi_cls_session *session);
extern struct iscsi_cls_session *iscsi_alloc_session(struct Scsi_Host *shost,
struct iscsi_transport *transport, int dd_size);
extern int iscsi_add_session(struct iscsi_cls_session *session,