[PATCH net-next v5 7/9] xen-netback: Add stat counters for frag_list skbs
From: Zoltan Kiss <hidden>
Date: 2014-01-20 21:26:12
Also in:
lkml, xen-devel
Subsystem:
networking drivers, the rest, xen network backend driver · Maintainers:
Andrew Lunn, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds, Wei Liu, Paul Durrant
These counters help determine how often the guest sends a packet with more than MAX_SKB_FRAGS frags. Signed-off-by: Zoltan Kiss <redacted> --- 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 e3c28ff..c037efb 100644
--- a/drivers/net/xen-netback/common.h
+++ b/drivers/net/xen-netback/common.h@@ -158,6 +158,7 @@ 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 ac27af3..b7daf8d 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c@@ -254,6 +254,13 @@ 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)
diff --git a/drivers/net/xen-netback/netback.c b/drivers/net/xen-netback/netback.c
index 9841429..4305965 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c@@ -1656,6 +1656,7 @@ static int xenvif_tx_submit(struct xenvif *vif, int budget) skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY; skb_shinfo(nskb)->tx_flags |= SKBTX_DEV_ZEROCOPY; vif->tx_zerocopy_sent += 2; + vif->tx_frag_overflow++; nskb = skb; skb = skb_copy_expand(skb, 0, 0, GFP_ATOMIC | __GFP_NOWARN);