[PATCH net-next v6 8/10] xen-netback: Add stat counters for frag_list skbs

[Zoltan Kiss]

These counters help determine how often the guest sends a packet with more
than MAX_SKB_FRAGS frags.

NOTE: if bisect brought you here, you should apply the series up until #9,
otherwise malicious guests can block other guests by not releasing their sent
packets.

Signed-off-by: Zoltan Kiss <zoltan.kiss@xxxxxxxxxx>
---
 drivers/net/xen-netback/common.h    |    1 +
 drivers/net/xen-netback/interface.c |    7 +++++++
 drivers/net/xen-netback/netback.c   |    1 +
 3 files changed, 9 insertions(+)

diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h
index eac171e..d8a2298 100644
--- a/drivers/net/xen-netback/common.h
+++ b/drivers/net/xen-netback/common.h
@@ -170,6 +170,7 @@ struct xenvif {
 	unsigned long tx_zerocopy_sent;
 	unsigned long tx_zerocopy_success;
 	unsigned long tx_zerocopy_fail;
+	unsigned long tx_frag_overflow;
 
 	/* Miscellaneous private stuff. */
 	struct net_device *dev;
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index adfed30..ba5be2f 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -252,6 +252,13 @@ static const struct xenvif_stat {
 		"tx_zerocopy_fail",
 		offsetof(struct xenvif, tx_zerocopy_fail)
 	},
+	/* Number of packets exceeding MAX_SKB_FRAG slots. You should use
+	 * a guest with the same MAX_SKB_FRAG
+	 */
+	{
+		"tx_frag_overflow",
+		offsetof(struct xenvif, tx_frag_overflow)
+	},
 };
 
 static int xenvif_get_sset_count(struct net_device *dev, int string_set)

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