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net: qrtr: Clean up control packet handling 

As the message header generation is deferred the internal functions for
generating control packets can be simplified.

This patch modifies qrtr_alloc_ctrl_packet() to, in addition to the
sk_buff, return a reference to a struct qrtr_ctrl_pkt, which clarifies
and simplifies the helpers to the point that these functions can be
folded back into the callers.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bjorn Andersson 2017-10-10 23:45:21 -07:00 committed by David S. Miller
parent e7044482c8
commit 1a7959c766
1 changed files with 29 additions and 64 deletions
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93
net/qrtr/qrtr.c
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@ -255,9 +255,18 @@ int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len)
}
EXPORT_SYMBOL_GPL(qrtr_endpoint_post);
static struct sk_buff *qrtr_alloc_ctrl_packet(u32 type, size_t pkt_len,
u32 src_node, u32 dst_node)
/**
* qrtr_alloc_ctrl_packet() - allocate control packet skb
* @pkt: reference to qrtr_ctrl_pkt pointer
*
* Returns newly allocated sk_buff, or NULL on failure
*
* This function allocates a sk_buff large enough to carry a qrtr_ctrl_pkt and
* on success returns a reference to the control packet in @pkt.
*/
static struct sk_buff *qrtr_alloc_ctrl_packet(struct qrtr_ctrl_pkt **pkt)
{
const int pkt_len = sizeof(struct qrtr_ctrl_pkt);
struct sk_buff *skb;
skb = alloc_skb(QRTR_HDR_SIZE + pkt_len, GFP_KERNEL);
@ -265,64 +274,7 @@ static struct sk_buff *qrtr_alloc_ctrl_packet(u32 type, size_t pkt_len,
return NULL;
skb_reserve(skb, QRTR_HDR_SIZE);
return skb;
}
/* Allocate and construct a resume-tx packet. */
static struct sk_buff *qrtr_alloc_resume_tx(u32 src_node,
u32 dst_node, u32 port)
{
const int pkt_len = 20;
struct sk_buff *skb;
__le32 *buf;
skb = qrtr_alloc_ctrl_packet(QRTR_TYPE_RESUME_TX, pkt_len,
src_node, dst_node);
if (!skb)
return NULL;
buf = skb_put_zero(skb, pkt_len);
buf[0] = cpu_to_le32(QRTR_TYPE_RESUME_TX);
buf[1] = cpu_to_le32(src_node);
buf[2] = cpu_to_le32(port);
return skb;
}
/* Allocate and construct a BYE message to signal remote termination */
static struct sk_buff *qrtr_alloc_local_bye(u32 src_node)
{
const int pkt_len = 20;
struct sk_buff *skb;
__le32 *buf;
skb = qrtr_alloc_ctrl_packet(QRTR_TYPE_BYE, pkt_len,
src_node, qrtr_local_nid);
if (!skb)
return NULL;
buf = skb_put_zero(skb, pkt_len);
buf[0] = cpu_to_le32(QRTR_TYPE_BYE);
return skb;
}
static struct sk_buff *qrtr_alloc_del_client(struct sockaddr_qrtr *sq)
{
const int pkt_len = 20;
struct sk_buff *skb;
__le32 *buf;
skb = qrtr_alloc_ctrl_packet(QRTR_TYPE_DEL_CLIENT, pkt_len,
sq->sq_node, QRTR_NODE_BCAST);
if (!skb)
return NULL;
buf = skb_put_zero(skb, pkt_len);
buf[0] = cpu_to_le32(QRTR_TYPE_DEL_CLIENT);
buf[1] = cpu_to_le32(sq->sq_node);
buf[2] = cpu_to_le32(sq->sq_port);
*pkt = skb_put_zero(skb, pkt_len);
return skb;
}
@ -337,6 +289,7 @@ static void qrtr_port_put(struct qrtr_sock *ipc);
static void qrtr_node_rx_work(struct work_struct *work)
{
struct qrtr_node *node = container_of(work, struct qrtr_node, work);
struct qrtr_ctrl_pkt *pkt;
struct sockaddr_qrtr dst;
struct sockaddr_qrtr src;
struct sk_buff *skb;
@ -372,10 +325,14 @@ static void qrtr_node_rx_work(struct work_struct *work)
}
if (confirm) {
skb = qrtr_alloc_resume_tx(dst_node, node->nid, dst_port);
skb = qrtr_alloc_ctrl_packet(&pkt);
if (!skb)
break;
pkt->cmd = cpu_to_le32(QRTR_TYPE_RESUME_TX);
pkt->client.node = cpu_to_le32(dst.sq_node);
pkt->client.port = cpu_to_le32(dst.sq_port);
if (qrtr_node_enqueue(node, skb, QRTR_TYPE_RESUME_TX,
&dst, &src))
break;
@ -429,6 +386,7 @@ void qrtr_endpoint_unregister(struct qrtr_endpoint *ep)
struct qrtr_node *node = ep->node;
struct sockaddr_qrtr src = {AF_QIPCRTR, node->nid, QRTR_PORT_CTRL};
struct sockaddr_qrtr dst = {AF_QIPCRTR, qrtr_local_nid, QRTR_PORT_CTRL};
struct qrtr_ctrl_pkt *pkt;
struct sk_buff *skb;
mutex_lock(&node->ep_lock);
@ -436,9 +394,11 @@ void qrtr_endpoint_unregister(struct qrtr_endpoint *ep)
mutex_unlock(&node->ep_lock);
/* Notify the local controller about the event */
skb = qrtr_alloc_local_bye(node->nid);
if (skb)
skb = qrtr_alloc_ctrl_packet(&pkt);
if (skb) {
pkt->cmd = cpu_to_le32(QRTR_TYPE_BYE);
qrtr_local_enqueue(NULL, skb, QRTR_TYPE_BYE, &src, &dst);
}
qrtr_node_release(node);
ep->node = NULL;
@ -474,6 +434,7 @@ static void qrtr_port_put(struct qrtr_sock *ipc)
/* Remove port assignment. */
static void qrtr_port_remove(struct qrtr_sock *ipc)
{
struct qrtr_ctrl_pkt *pkt;
struct sk_buff *skb;
int port = ipc->us.sq_port;
struct sockaddr_qrtr to;
@ -482,8 +443,12 @@ static void qrtr_port_remove(struct qrtr_sock *ipc)
to.sq_node = QRTR_NODE_BCAST;
to.sq_port = QRTR_PORT_CTRL;
skb = qrtr_alloc_del_client(&ipc->us);
skb = qrtr_alloc_ctrl_packet(&pkt);
if (skb) {
pkt->cmd = cpu_to_le32(QRTR_TYPE_DEL_CLIENT);
pkt->client.node = cpu_to_le32(ipc->us.sq_node);
pkt->client.port = cpu_to_le32(ipc->us.sq_port);
skb_set_owner_w(skb, &ipc->sk);
qrtr_bcast_enqueue(NULL, skb, QRTR_TYPE_DEL_CLIENT, &ipc->us,
&to);