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Commit 549c20c9 authored by Bjorn Andersson's avatar Bjorn Andersson Committed by Chris Lew
Browse files

net: qrtr: Move resume-tx transmission to recvmsg 



The confirm-rx bit is used to implement a per port flow control, in
order to make sure that no messages are dropped due to resource
exhaustion. Move the resume-tx transmission to recvmsg to only confirm
messages as they are consumed by the application.

Change-Id: Icd990ef9dc46c983c9231fe1e72ba9dcbef5a0c3
Signed-off-by: default avatarBjorn Andersson <bjorn.andersson@linaro.org>
Patch-mainline: linux-arm-kernel @ 07/05/19, 23:06
Signed-off-by: default avatarChris Lew <clew@codeaurora.org>
parent a1811128

net/qrtr/qrtr.c

+33 −27
Original line number Diff line number Diff line
@@ -362,22 +362,11 @@ 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;



	while ((skb = skb_dequeue(&node->rx_queue)) != NULL) {

		struct qrtr_sock *ipc;

		struct qrtr_cb *cb;

		int confirm;



		cb = (struct qrtr_cb *)skb->cb;

		src.sq_node = cb->src_node;

		src.sq_port = cb->src_port;

		dst.sq_node = cb->dst_node;

		dst.sq_port = cb->dst_port;

		confirm = !!cb->confirm_rx;

		struct qrtr_cb *cb = (struct qrtr_cb *)skb->cb;



		qrtr_node_assign(node, cb->src_node);
@@ -390,20 +379,6 @@ static void qrtr_node_rx_work(struct work_struct *work) 


			qrtr_port_put(ipc);

		}



		if (confirm) {

			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;

		}

	}

}
@@ -816,6 +791,34 @@ static int qrtr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len) 
	return rc;

}



static int qrtr_send_resume_tx(struct qrtr_cb *cb)

{

	struct sockaddr_qrtr remote = { AF_QIPCRTR, cb->src_node, cb->src_port };

	struct sockaddr_qrtr local = { AF_QIPCRTR, cb->dst_node, cb->dst_port };

	struct qrtr_ctrl_pkt *pkt;

	struct qrtr_node *node;

	struct sk_buff *skb;

	int ret;



	node = qrtr_node_lookup(remote.sq_node);

	if (!node)

		return -EINVAL;



	skb = qrtr_alloc_ctrl_packet(&pkt);

	if (!skb)

		return -ENOMEM;



	pkt->cmd = cpu_to_le32(QRTR_TYPE_RESUME_TX);

	pkt->client.node = cpu_to_le32(cb->dst_node);

	pkt->client.port = cpu_to_le32(cb->dst_port);



	ret = qrtr_node_enqueue(node, skb, QRTR_TYPE_RESUME_TX, &local, &remote);



	qrtr_node_release(node);



	return ret;

}



static int qrtr_recvmsg(struct socket *sock, struct msghdr *msg,

			size_t size, int flags)

{
@@ -838,6 +841,7 @@ static int qrtr_recvmsg(struct socket *sock, struct msghdr *msg, 
		release_sock(sk);

		return rc;

	}

	cb = (struct qrtr_cb *)skb->cb;



	copied = skb->len;

	if (copied > size) {
@@ -851,7 +855,6 @@ static int qrtr_recvmsg(struct socket *sock, struct msghdr *msg, 
	rc = copied;



	if (addr) {

		cb = (struct qrtr_cb *)skb->cb;

		addr->sq_family = AF_QIPCRTR;

		addr->sq_node = cb->src_node;

		addr->sq_port = cb->src_port;
@@ -859,6 +862,9 @@ static int qrtr_recvmsg(struct socket *sock, struct msghdr *msg, 
	}



out:

	if (cb->confirm_rx)

		qrtr_send_resume_tx(cb);



	skb_free_datagram(sk, skb);

	release_sock(sk);