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[SCSI] iscsi_transport: Added Ping support

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Added ping support for iscsi adapter, application can use this
interface for diagnostic network connection.

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 18:30:48 +05:30
committed by James Bottomley
parent ff88443080
commit ac20c7bf07
3 changed files with 84 additions and 0 deletions
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59
drivers/scsi/scsi_transport_iscsi.c
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@@ -1507,6 +1507,35 @@ void iscsi_post_host_event(uint32_t host_no, struct iscsi_transport *transport,
}
EXPORT_SYMBOL_GPL(iscsi_post_host_event);
void iscsi_ping_comp_event(uint32_t host_no, struct iscsi_transport *transport,
uint32_t status, uint32_t pid, 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 ping comp: OOM\n");
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_PING_COMP;
ev->r.ping_comp.host_no = host_no;
ev->r.ping_comp.status = status;
ev->r.ping_comp.pid = pid;
ev->r.ping_comp.data_size = data_size;
memcpy((char *)ev + sizeof(*ev), data, data_size);
iscsi_multicast_skb(skb, ISCSI_NL_GRP_ISCSID, GFP_KERNEL);
}
EXPORT_SYMBOL_GPL(iscsi_ping_comp_event);
static int
iscsi_if_send_reply(uint32_t group, int seq, int type, int done, int multi,
void *payload, int size)
@@ -1945,6 +1974,33 @@ iscsi_set_iface_params(struct iscsi_transport *transport,
return err;
}
static int
iscsi_send_ping(struct iscsi_transport *transport, struct iscsi_uevent *ev)
{
struct Scsi_Host *shost;
struct sockaddr *dst_addr;
int err;
if (!transport->send_ping)
return -ENOSYS;
shost = scsi_host_lookup(ev->u.iscsi_ping.host_no);
if (!shost) {
printk(KERN_ERR "iscsi_ping could not find host no %u\n",
ev->u.iscsi_ping.host_no);
return -ENODEV;
}
dst_addr = (struct sockaddr *)((char *)ev + sizeof(*ev));
err = transport->send_ping(shost, ev->u.iscsi_ping.iface_num,
ev->u.iscsi_ping.iface_type,
ev->u.iscsi_ping.payload_size,
ev->u.iscsi_ping.pid,
dst_addr);
scsi_host_put(shost);
return err;
}
static int
iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
{
@@ -2090,6 +2146,9 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, uint32_t *group)
err = iscsi_set_iface_params(transport, ev,
nlmsg_attrlen(nlh, sizeof(*ev)));
break;
case ISCSI_UEVENT_PING:
err = iscsi_send_ping(transport, ev);
break;
default:
err = -ENOSYS;
break;