[PATCH 08/14] connector: add portid to unicast in addition to broadcasting

David Fries
2013-12-29T06:53:58Z

This allows replying only to the requestor portid while still
supporting broadcasting. Pass 0 to portid for the previous behavior.

Signed-off-by: David Fries <David@Fries.net>
Cc: Evgeniy Polyakov <zbr@ioremap.net>
---
Documentation/connector/cn_test.c | 2 +-
drivers/connector/cn_proc.c | 18 +++++++++---------
drivers/connector/connector.c | 20 +++++++++++++-------
drivers/hv/hv_kvp.c | 4 ++--
drivers/hv/hv_snapshot.c | 2 +-
drivers/md/dm-log-userspace-transfer.c | 2 +-
drivers/video/uvesafb.c | 4 ++--
drivers/w1/w1_netlink.c | 14 +++++++-------
include/linux/connector.h | 2 +-
9 files changed, 37 insertions(+), 31 deletions(-)

diff --git a/Documentation/connector/cn_test.c b/Documentation/connector/cn_test.c
index adcca03..d12cc94 100644
--- a/Documentation/connector/cn_test.c
+++ b/Documentation/connector/cn_test.c
@@ -145,7 +145,7 @@ static void cn_test_timer_func(unsigned long __data)

memcpy(m + 1, data, m->len);

- cn_netlink_send(m, 0, GFP_ATOMIC);
+ cn_netlink_send(m, 0, 0, GFP_ATOMIC);
kfree(m);
}

diff --git a/drivers/connector/cn_proc.c b/drivers/connector/cn_proc.c
index 18c5b9b..148d707 100644
--- a/drivers/connector/cn_proc.c
+++ b/drivers/connector/cn_proc.c
@@ -95,7 +95,7 @@ void proc_fork_connector(struct task_struct *task)
msg->len = sizeof(*ev);
msg->flags = 0; /* not used */
/* If cn_netlink_send() failed, the data is not sent */
- cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
+ cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL);
}

void proc_exec_connector(struct task_struct *task)
@@ -122,7 +122,7 @@ void proc_exec_connector(struct task_struct *task)
msg->ack = 0; /* not used */
msg->len = sizeof(*ev);
msg->flags = 0; /* not used */
- cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
+ cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL);
}

void proc_id_connector(struct task_struct *task, int which_id)
@@ -163,7 +163,7 @@ void proc_id_connector(struct task_struct *task, int which_id)
msg->ack = 0; /* not used */
msg->len = sizeof(*ev);
msg->flags = 0; /* not used */
- cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
+ cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL);
}

void proc_sid_connector(struct task_struct *task)
@@ -190,7 +190,7 @@ void proc_sid_connector(struct task_struct *task)
msg->ack = 0; /* not used */
msg->len = sizeof(*ev);
msg->flags = 0; /* not used */
- cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
+ cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL);
}

void proc_ptrace_connector(struct task_struct *task, int ptrace_id)
@@ -225,7 +225,7 @@ void proc_ptrace_connector(struct task_struct *task, int ptrace_id)
msg->ack = 0; /* not used */
msg->len = sizeof(*ev);
msg->flags = 0; /* not used */
- cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
+ cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL);
}

void proc_comm_connector(struct task_struct *task)
@@ -253,7 +253,7 @@ void proc_comm_connector(struct task_struct *task)
msg->ack = 0; /* not used */
msg->len = sizeof(*ev);
msg->flags = 0; /* not used */
- cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
+ cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL);
}

void proc_coredump_connector(struct task_struct *task)
@@ -280,7 +280,7 @@ void proc_coredump_connector(struct task_struct *task)
msg->ack = 0; /* not used */
msg->len = sizeof(*ev);
msg->flags = 0; /* not used */
- cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
+ cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL);
}

void proc_exit_connector(struct task_struct *task)
@@ -309,7 +309,7 @@ void proc_exit_connector(struct task_struct *task)
msg->ack = 0; /* not used */
msg->len = sizeof(*ev);
msg->flags = 0; /* not used */
- cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
+ cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL);
}

/*
@@ -343,7 +343,7 @@ static void cn_proc_ack(int err, int rcvd_seq, int rcvd_ack)
msg->ack = rcvd_ack + 1;
msg->len = sizeof(*ev);
msg->flags = 0; /* not used */
- cn_netlink_send(msg, CN_IDX_PROC, GFP_KERNEL);
+ cn_netlink_send(msg, 0, CN_IDX_PROC, GFP_KERNEL);
}

/**
diff --git a/drivers/connector/connector.c b/drivers/connector/connector.c
index a36749f..77afe74 100644
--- a/drivers/connector/connector.c
+++ b/drivers/connector/connector.c
@@ -50,7 +50,7 @@ static int cn_already_initialized;
*
* Sequence number is incremented with each message to be sent.
*
- * If we expect reply to our message then the sequence number in
+ * If we expect a reply to our message then the sequence number in
* received message MUST be the same as in original message, and
* acknowledge number MUST be the same + 1.
*
@@ -62,8 +62,11 @@ static int cn_already_initialized;
* the acknowledgement number in the original message + 1, then it is
* a new message.
*
+ * The message is sent to, the portid if given, the group if given, both if
+ * both, or if both are zero then the group is looked up and sent there.
*/
-int cn_netlink_send(struct cn_msg *msg, u32 __group, gfp_t gfp_mask)
+int cn_netlink_send(struct cn_msg *msg, u32 portid, u32 __group,
+ gfp_t gfp_mask)
{
struct cn_callback_entry *__cbq;
unsigned int size;
@@ -74,7 +77,9 @@ int cn_netlink_send(struct cn_msg *msg, u32 __group, gfp_t gfp_mask)
u32 group = 0;
int found = 0;

- if (!__group) {
+ if (portid || __group) {
+ group = __group;
+ } else {
spin_lock_bh(&dev->cbdev->queue_lock);
list_for_each_entry(__cbq, &dev->cbdev->queue_list,
callback_entry) {
@@ -88,11 +93,9 @@ int cn_netlink_send(struct cn_msg *msg, u32 __group, gfp_t gfp_mask)

if (!found)
return -ENODEV;
- } else {
- group = __group;
}

- if (!netlink_has_listeners(dev->nls, group))
+ if (!portid && !netlink_has_listeners(dev->nls, group))
return -ESRCH;

size = sizeof(*msg) + msg->len;
@@ -113,7 +116,10 @@ int cn_netlink_send(struct cn_msg *msg, u32 __group, gfp_t gfp_mask)

NETLINK_CB(skb).dst_group = group;

- return netlink_broadcast(dev->nls, skb, 0, group, gfp_mask);
+ if (group)
+ return netlink_broadcast(dev->nls, skb, portid, group,
+ gfp_mask);
+ return netlink_unicast(dev->nls, skb, portid, !(gfp_mask&__GFP_WAIT));
}
EXPORT_SYMBOL_GPL(cn_netlink_send);

diff --git a/drivers/hv/hv_kvp.c b/drivers/hv/hv_kvp.c
index 09988b2..ea85253 100644
--- a/drivers/hv/hv_kvp.c
+++ b/drivers/hv/hv_kvp.c
@@ -113,7 +113,7 @@ kvp_register(int reg_value)
kvp_msg->kvp_hdr.operation = reg_value;
strcpy(version, HV_DRV_VERSION);
msg->len = sizeof(struct hv_kvp_msg);
- cn_netlink_send(msg, 0, GFP_ATOMIC);
+ cn_netlink_send(msg, 0, 0, GFP_ATOMIC);
kfree(msg);
}
}
@@ -435,7 +435,7 @@ kvp_send_key(struct work_struct *dummy)
}

msg->len = sizeof(struct hv_kvp_msg);
- cn_netlink_send(msg, 0, GFP_ATOMIC);
+ cn_netlink_send(msg, 0, 0, GFP_ATOMIC);
kfree(msg);

return;
diff --git a/drivers/hv/hv_snapshot.c b/drivers/hv/hv_snapshot.c
index 0c35462..34f14fd 100644
--- a/drivers/hv/hv_snapshot.c
+++ b/drivers/hv/hv_snapshot.c
@@ -98,7 +98,7 @@ static void vss_send_op(struct work_struct *dummy)
vss_msg->vss_hdr.operation = op;
msg->len = sizeof(struct hv_vss_msg);

- cn_netlink_send(msg, 0, GFP_ATOMIC);
+ cn_netlink_send(msg, 0, 0, GFP_ATOMIC);
kfree(msg);

return;
diff --git a/drivers/md/dm-log-userspace-transfer.c b/drivers/md/dm-log-userspace-transfer.c
index 08d9a20..b428c0a 100644
--- a/drivers/md/dm-log-userspace-transfer.c
+++ b/drivers/md/dm-log-userspace-transfer.c
@@ -66,7 +66,7 @@ static int dm_ulog_sendto_server(struct dm_ulog_request *tfr)
msg->seq = tfr->seq;
msg->len = sizeof(struct dm_ulog_request) + tfr->data_size;

- r = cn_netlink_send(msg, 0, gfp_any());
+ r = cn_netlink_send(msg, 0, 0, gfp_any());

return r;
}
diff --git a/drivers/video/uvesafb.c b/drivers/video/uvesafb.c
index 256fba7..1f38445 100644
--- a/drivers/video/uvesafb.c
+++ b/drivers/video/uvesafb.c
@@ -190,7 +190,7 @@ static int uvesafb_exec(struct uvesafb_ktask *task)
uvfb_tasks[seq] = task;
mutex_unlock(&uvfb_lock);

- err = cn_netlink_send(m, 0, GFP_KERNEL);
+ err = cn_netlink_send(m, 0, 0, GFP_KERNEL);
if (err == -ESRCH) {
/*
* Try to start the userspace helper if sending
@@ -204,7 +204,7 @@ static int uvesafb_exec(struct uvesafb_ktask *task)
"helper is installed and executable\n");
} else {
v86d_started = 1;
- err = cn_netlink_send(m, 0, gfp_any());
+ err = cn_netlink_send(m, 0, 0, gfp_any());
if (err == -ENOBUFS)
err = 0;
}
diff --git a/drivers/w1/w1_netlink.c b/drivers/w1/w1_netlink.c
index 06d614a..b63109a 100644
--- a/drivers/w1/w1_netlink.c
+++ b/drivers/w1/w1_netlink.c
@@ -45,7 +45,7 @@ void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)

memcpy(w, msg, sizeof(struct w1_netlink_msg));

- cn_netlink_send(m, 0, GFP_KERNEL);
+ cn_netlink_send(m, 0, 0, GFP_KERNEL);
}

static void w1_send_slave(struct w1_master *dev, u64 rn)
@@ -60,7 +60,7 @@ static void w1_send_slave(struct w1_master *dev, u64 rn)

if (avail < 8) {
msg->ack++;
- cn_netlink_send(msg, 0, GFP_KERNEL);
+ cn_netlink_send(msg, 0, 0, GFP_KERNEL);

msg->len = sizeof(struct w1_netlink_msg) +
sizeof(struct w1_netlink_cmd);
@@ -131,7 +131,7 @@ static int w1_get_slaves(struct w1_master *dev,
}

msg->ack = 0;
- cn_netlink_send(msg, 0, GFP_KERNEL);
+ cn_netlink_send(msg, 0, 0, GFP_KERNEL);

dev->priv = NULL;
dev->priv_size = 0;
@@ -173,7 +173,7 @@ static int w1_send_read_reply(struct cn_msg *msg, struct w1_netlink_msg *hdr,

memcpy(c->data, cmd->data, c->len);

- err = cn_netlink_send(cm, 0, GFP_KERNEL);
+ err = cn_netlink_send(cm, 0, 0, GFP_KERNEL);

kfree(data);

@@ -316,7 +316,7 @@ static int w1_process_command_root(struct cn_msg *msg, struct w1_netlink_msg *mc
mutex_lock(&w1_mlock);
list_for_each_entry(m, &w1_masters, w1_master_entry) {
if (cn->len + sizeof(*id) > PAGE_SIZE - sizeof(struct cn_msg)) {
- cn_netlink_send(cn, 0, GFP_KERNEL);
+ cn_netlink_send(cn, 0, 0, GFP_KERNEL);
cn->ack++;
cn->len = sizeof(struct w1_netlink_msg);
w->len = 0;
@@ -329,7 +329,7 @@ static int w1_process_command_root(struct cn_msg *msg, struct w1_netlink_msg *mc
id++;
}
cn->ack = 0;
- cn_netlink_send(cn, 0, GFP_KERNEL);
+ cn_netlink_send(cn, 0, 0, GFP_KERNEL);
mutex_unlock(&w1_mlock);

kfree(cn);
@@ -364,7 +364,7 @@ static int w1_netlink_send_error(struct cn_msg *rcmsg, struct w1_netlink_msg *rm
cmsg->len += sizeof(*cmd);
}

- error = cn_netlink_send(cmsg, 0, GFP_KERNEL);
+ error = cn_netlink_send(cmsg, 0, 0, GFP_KERNEL);
kfree(cmsg);

return error;
diff --git a/include/linux/connector.h b/include/linux/connector.h
index b2b5a41..be9c4747 100644
--- a/include/linux/connector.h
+++ b/include/linux/connector.h
@@ -71,7 +71,7 @@ struct cn_dev {
int cn_add_callback(struct cb_id *id, const char *name,
void (*callback)(struct cn_msg *, struct netlink_skb_parms *));
void cn_del_callback(struct cb_id *);
-int cn_netlink_send(struct cn_msg *, u32, gfp_t);
+int cn_netlink_send(struct cn_msg *msg, u32 portid, u32 group, gfp_t gfp_mask);

int cn_queue_add_callback(struct cn_queue_dev *dev, const char *name,
struct cb_id *id,
--
1.7.10.4