[dpdk-dev] [PATCH] kni: fix possible rx_q mbuf leak and speed up alloc_q release

[Yangchao Zhou <zhouyates@gmail.com>]

rx_q fifo can only be released by kernel thread. There may be
mbuf leaks in rx_q because  kernel threads are randomly stopped.

When the kni is released and netdev is unregisterd, convert the
physical address mbufs in rx_q to the virtual address in free_q.
By the way, alloc_q can be processed together to speed up the
release rate in userspace.

Signed-off-by: Yangchao Zhou <zhouyates@gmail.com>
Suggested-by: Ferruh Yigit <ferruh.yigit@intel.com>
---
 kernel/linux/kni/kni_dev.h  |  1 +
 kernel/linux/kni/kni_misc.c |  2 ++
 kernel/linux/kni/kni_net.c  | 41 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 44 insertions(+)

diff --git a/kernel/linux/kni/kni_dev.h b/kernel/linux/kni/kni_dev.h
index c9393d8..6275ef2 100644
--- a/kernel/linux/kni/kni_dev.h
+++ b/kernel/linux/kni/kni_dev.h
@@ -92,6 +92,7 @@ struct kni_dev {
 	void *alloc_va[MBUF_BURST_SZ];
 };
 
+void kni_net_release_fifo_phy(struct kni_dev *kni);
 void kni_net_rx(struct kni_dev *kni);
 void kni_net_init(struct net_device *dev);
 void kni_net_config_lo_mode(char *lo_str);
diff --git a/kernel/linux/kni/kni_misc.c b/kernel/linux/kni/kni_misc.c
index 01574ec..fa69f8e 100644
--- a/kernel/linux/kni/kni_misc.c
+++ b/kernel/linux/kni/kni_misc.c
@@ -192,6 +192,8 @@ kni_dev_remove(struct kni_dev *dev)
 		free_netdev(dev->net_dev);
 	}
 
+	kni_net_release_fifo_phy(dev);
+
 	return 0;
 }
 
diff --git a/kernel/linux/kni/kni_net.c b/kernel/linux/kni/kni_net.c
index 9f9b798..bcf458c 100644
--- a/kernel/linux/kni/kni_net.c
+++ b/kernel/linux/kni/kni_net.c
@@ -163,6 +163,47 @@ kni_net_release(struct net_device *dev)
 	return (ret == 0) ? req.result : ret;
 }
 
+static void
+kni_fifo_trans_pa2va(struct kni_dev *kni, 
+	struct rte_kni_fifo *src_pa, struct rte_kni_fifo *dst_va)
+{
+	uint32_t ret, i, num_fq, num_rx;
+	void *kva;
+	do {
+		num_fq = kni_fifo_free_count(kni->free_q);
+		if (num_fq == 0) {
+			return;
+		}
+		num_rx = min_t(uint32_t, num_fq, MBUF_BURST_SZ);
+
+		num_rx = kni_fifo_get(src_pa, kni->pa, num_rx);
+		if (num_rx == 0) {
+			return;
+		}
+
+		for (i = 0; i < num_rx; i++) {
+			kva = pa2kva(kni->pa[i]);
+			kni->va[i] = pa2va(kni->pa[i], kva);
+		}
+
+		ret = kni_fifo_put(dst_va, kni->va, num_rx);
+		if (ret != num_rx) {
+			/* Failing should not happen */
+			pr_err("Fail to enqueue entries into dst_va\n");
+			return;
+		}
+	} while (1);
+}
+
+/* Try to release mbufs when kni release */
+void kni_net_release_fifo_phy(struct kni_dev *kni)
+{
+	/* release rx_q first, because it can't release in userspace */
+	kni_fifo_trans_pa2va(kni, kni->rx_q, kni->free_q);
+	/* release alloc_q for speeding up kni release in userspace */
+	kni_fifo_trans_pa2va(kni, kni->alloc_q, kni->free_q);
+}
+
 /*
  * Configuration changes (passed on by ifconfig)
  */
-- 
2.9.0.windows.1