netdev - [RFC PATCH v2 13/14] xsk: statistics support

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Date:   Tue, 27 Mar 2018 18:59:18 +0200
From:   Björn Töpel <bjorn.topel@...il.com>
To:     bjorn.topel@...il.com, magnus.karlsson@...el.com,
        alexander.h.duyck@...el.com, alexander.duyck@...il.com,
        john.fastabend@...il.com, ast@...com, brouer@...hat.com,
        willemdebruijn.kernel@...il.com, daniel@...earbox.net,
        netdev@...r.kernel.org
Cc:     michael.lundkvist@...csson.com, jesse.brandeburg@...el.com,
        anjali.singhai@...el.com, qi.z.zhang@...el.com,
        ravineet.singh@...csson.com
Subject: [RFC PATCH v2 13/14] xsk: statistics support

From: Magnus Karlsson <magnus.karlsson@...el.com>

In this commit, a new getsockopt is added: XDP_STATISTICS. This is
used to obtain stats from the sockets.

Signed-off-by: Magnus Karlsson <magnus.karlsson@...el.com>
---
 include/uapi/linux/if_xdp.h |  7 +++++++
 net/xdp/xsk.c               | 42 +++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 48 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/if_xdp.h b/include/uapi/linux/if_xdp.h
index 6cab56fb8be6..4d8142c1596d 100644
--- a/include/uapi/linux/if_xdp.h
+++ b/include/uapi/linux/if_xdp.h
@@ -37,6 +37,7 @@ struct sockaddr_xdp {
 #define XDP_UMEM_REG		  3
 #define XDP_UMEM_FILL_QUEUE	  4
 #define XDP_UMEM_COMPLETION_QUEUE 5
+#define XDP_STATISTICS		  6
 
 struct xdp_umem_reg {
 	__u64 addr; /* Start of packet data area */
@@ -45,6 +46,12 @@ struct xdp_umem_reg {
 	__u32 frame_headroom; /* Frame head room */
 };
 
+struct xdp_statistics {
+	__u64 rx_dropped; /* Dropped for reasons other than invalid desc */
+	__u64 rx_invalid_descs; /* Dropped due to invalid descriptor */
+	__u64 tx_invalid_descs; /* Dropped due to invalid descriptor */
+};
+
 /* Pgoff for mmaping the rings */
 #define XDP_PGOFF_RX_QUEUE			  0
 #define XDP_PGOFF_TX_QUEUE		 0x80000000
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 685b6f360628..780a5b42d9b2 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -523,6 +523,46 @@ static int xsk_setsockopt(struct socket *sock, int level, int optname,
 	return -ENOPROTOOPT;
 }
 
+static int xsk_getsockopt(struct socket *sock, int level, int optname,
+			  char __user *optval, int __user *optlen)
+{
+	struct sock *sk = sock->sk;
+	struct xdp_sock *xs = xdp_sk(sk);
+	int len;
+
+	if (level != SOL_XDP)
+		return -ENOPROTOOPT;
+
+	if (get_user(len, optlen))
+		return -EFAULT;
+	if (len < 0)
+		return -EINVAL;
+
+	switch (optname) {
+	case XDP_STATISTICS:
+	{
+		struct xdp_statistics stats;
+
+		if (len != sizeof(stats))
+			return -EINVAL;
+
+		mutex_lock(&xs->mutex);
+		stats.rx_dropped = xs->rx_dropped;
+		stats.rx_invalid_descs = xskq_nb_invalid_descs(xs->rx);
+		stats.tx_invalid_descs = xskq_nb_invalid_descs(xs->tx);
+		mutex_unlock(&xs->mutex);
+
+		if (copy_to_user(optval, &stats, sizeof(stats)))
+			return -EFAULT;
+		return 0;
+	}
+	default:
+		break;
+	}
+
+	return -EOPNOTSUPP;
+}
+
 static int xsk_mmap(struct file *file, struct socket *sock,
 		    struct vm_area_struct *vma)
 {
@@ -581,7 +621,7 @@ static const struct proto_ops xsk_proto_ops = {
 	.listen =	sock_no_listen,
 	.shutdown =	sock_no_shutdown,
 	.setsockopt =	xsk_setsockopt,
-	.getsockopt =	sock_no_getsockopt,
+	.getsockopt =	xsk_getsockopt,
 	.sendmsg =	xsk_sendmsg,
 	.recvmsg =	sock_no_recvmsg,
 	.mmap =		xsk_mmap,
-- 
2.14.1