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Subject[PATCH 1/5] net: qrtr: Move resume-tx transmission to recvmsg
Date
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.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
net/qrtr/qrtr.c | 60 +++++++++++++++++++++++++++----------------------
1 file changed, 33 insertions(+), 27 deletions(-)

diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c
index dd0e97f4f6c0..07a35362fba2 100644
--- a/net/qrtr/qrtr.c
+++ b/net/qrtr/qrtr.c
@@ -369,22 +369,11 @@ 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);

@@ -397,20 +386,6 @@ 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;
- }
}
}

@@ -822,6 +797,34 @@ static int qrtr_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
return rc;
}

+static int qrtr_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)
{
@@ -844,6 +847,7 @@ 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) {
@@ -857,7 +861,6 @@ 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;
@@ -865,6 +868,9 @@ static int qrtr_recvmsg(struct socket *sock, struct msghdr *msg,
}

out:
+ if (cb->confirm_rx)
+ qrtr_resume_tx(cb);
+
skb_free_datagram(sk, skb);
release_sock(sk);

--
2.18.0
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