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[SCSI] scsi_transport_iscsi: added support for host event 

Added support to post kernel host event to application using
netlink interface.

Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Vikas Chaudhary 2012-02-13 18:30:46 +05:30 committed by James Bottomley
parent 46801ba698
commit a11e254595
3 changed files with 50 additions and 0 deletions
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31
drivers/scsi/scsi_transport_iscsi.c
View File

@ -1476,6 +1476,37 @@ void iscsi_conn_login_event(struct iscsi_cls_conn *conn,
}
EXPORT_SYMBOL_GPL(iscsi_conn_login_event);
void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
enum iscsi_host_event_code code, uint32_t data_size,
uint8_t *data)
{
struct nlmsghdr *nlh;
struct sk_buff *skb;
struct iscsi_uevent *ev;
int len = NLMSG_SPACE(sizeof(*ev) + data_size);
skb = alloc_skb(len, GFP_KERNEL);
if (!skb) {
printk(KERN_ERR "gracefully ignored host event (%d):%d OOM\n",
host_no, code);
return;
}
nlh = __nlmsg_put(skb, 0, 0, 0, (len - sizeof(*nlh)), 0);
ev = NLMSG_DATA(nlh);
ev->transport_handle = iscsi_handle(transport);
ev->type = ISCSI_KEVENT_HOST_EVENT;
ev->r.host_event.host_no = host_no;
ev->r.host_event.code = code;
ev->r.host_event.data_size = data_size;
if (data_size)
memcpy((char *)ev + sizeof(*ev), data, data_size);
iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
}
EXPORT_SYMBOL_GPL(iscsi_post_host_event);
static int
iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
void *payload, int size)

13
include/scsi/iscsi_if.h
View File

@ -72,6 +72,7 @@ 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,
ISCSI_KEVENT_HOST_EVENT = KEVENT_BASE + 10,
};
enum iscsi_tgt_dscvr {
@ -80,6 +81,13 @@ enum iscsi_tgt_dscvr {
ISCSI_TGT_DSCVR_SLP = 3,
};
enum iscsi_host_event_code {
ISCSI_EVENT_LINKUP = 1,
ISCSI_EVENT_LINKDOWN,
/* must always be last */
ISCSI_EVENT_MAX,
};
struct iscsi_uevent {
uint32_t type; /* k/u events type */
uint32_t iferror; /* carries interface or resource errors */
@ -222,6 +230,11 @@ struct iscsi_uevent {
struct msg_notify_if_down {
uint32_t host_no;
} notify_if_down;
struct msg_host_event {
uint32_t host_no;
uint32_t data_size;
enum iscsi_host_event_code code;
} host_event;
} r;
} __attribute__ ((aligned (sizeof(uint64_t))));

6
include/scsi/scsi_transport_iscsi.h
View File

@ -166,6 +166,12 @@ extern int iscsi_offload_mesg(struct Scsi_Host *shost,
struct iscsi_transport *transport, uint32_t type,
char *data, uint16_t data_size);
extern void iscsi_post_host_event(uint32_t host_no,
struct iscsi_transport *transport,
enum iscsi_host_event_code code,
uint32_t data_size,
uint8_t *data);
struct iscsi_cls_conn {
struct list_head conn_list; /* item in connlist */
void *dd_data; /* LLD private data */