From: Zoltan Kiss <zoltan.kiss@citrix.com>
To: <ian.campbell@citrix.com>, <wei.liu2@citrix.com>,
<xen-devel@lists.xenproject.org>, <netdev@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <jonathan.davies@citrix.com>
Cc: Zoltan Kiss <zoltan.kiss@citrix.com>
Subject: [PATCH net-next v4 5/9] xen-netback: Add stat counters for zerocopy
Date: Tue, 14 Jan 2014 20:39:51 +0000 [thread overview]
Message-ID: <1389731995-9887-6-git-send-email-zoltan.kiss@citrix.com> (raw)
In-Reply-To: <1389731995-9887-1-git-send-email-zoltan.kiss@citrix.com>
These counters help determine how often the buffers had to be copied. Also
they help find out if packets are leaked, as if "sent != success + fail",
there are probably packets never freed up properly.
Signed-off-by: Zoltan Kiss <zoltan.kiss@citrix.com>
---
drivers/net/xen-netback/common.h | 3 +++
drivers/net/xen-netback/interface.c | 15 +++++++++++++++
drivers/net/xen-netback/netback.c | 9 ++++++++-
3 files changed, 26 insertions(+), 1 deletion(-)
diff --git a/drivers/net/xen-netback/common.h b/drivers/net/xen-netback/common.h
index 419e63c..e3c28ff 100644
--- a/drivers/net/xen-netback/common.h
+++ b/drivers/net/xen-netback/common.h
@@ -155,6 +155,9 @@ struct xenvif {
/* Statistics */
unsigned long rx_gso_checksum_fixup;
+ unsigned long tx_zerocopy_sent;
+ unsigned long tx_zerocopy_success;
+ unsigned long tx_zerocopy_fail;
/* Miscellaneous private stuff. */
struct net_device *dev;
diff --git a/drivers/net/xen-netback/interface.c b/drivers/net/xen-netback/interface.c
index af5216f..75fe683 100644
--- a/drivers/net/xen-netback/interface.c
+++ b/drivers/net/xen-netback/interface.c
@@ -239,6 +239,21 @@ static const struct xenvif_stat {
"rx_gso_checksum_fixup",
offsetof(struct xenvif, rx_gso_checksum_fixup)
},
+ /* If (sent != success + fail), there are probably packets never
+ * freed up properly!
+ */
+ {
+ "tx_zerocopy_sent",
+ offsetof(struct xenvif, tx_zerocopy_sent),
+ },
+ {
+ "tx_zerocopy_success",
+ offsetof(struct xenvif, tx_zerocopy_success),
+ },
+ {
+ "tx_zerocopy_fail",
+ offsetof(struct xenvif, tx_zerocopy_fail)
+ },
};
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 a1b03e4..e2dd565 100644
--- a/drivers/net/xen-netback/netback.c
+++ b/drivers/net/xen-netback/netback.c
@@ -1611,8 +1611,10 @@ static int xenvif_tx_submit(struct xenvif *vif, int budget)
* skb_copy_ubufs while we are still in control of the skb. E.g.
* the __pskb_pull_tail earlier can do such thing.
*/
- if (skb_shinfo(skb)->destructor_arg)
+ if (skb_shinfo(skb)->destructor_arg) {
skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
+ vif->tx_zerocopy_sent++;
+ }
netif_receive_skb(skb);
}
@@ -1645,6 +1647,11 @@ void xenvif_zerocopy_callback(struct ubuf_info *ubuf, bool zerocopy_success)
napi_schedule(&vif->napi);
} while (ubuf);
spin_unlock_irqrestore(&vif->dealloc_lock, flags);
+
+ if (likely(zerocopy_success))
+ vif->tx_zerocopy_success++;
+ else
+ vif->tx_zerocopy_fail++;
}
static inline void xenvif_tx_action_dealloc(struct xenvif *vif)
next prev parent reply other threads:[~2014-01-14 20:41 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-14 20:39 [PATCH net-next v4 0/9] xen-netback: TX grant mapping with SKBTX_DEV_ZEROCOPY instead of copy Zoltan Kiss
2014-01-14 20:39 ` [PATCH net-next v4 1/9] xen-netback: Introduce TX grant map definitions Zoltan Kiss
2014-01-15 15:16 ` Zoltan Kiss
2014-01-16 0:00 ` Wei Liu
2014-01-20 16:53 ` Zoltan Kiss
2014-01-14 20:39 ` [PATCH net-next v4 2/9] xen-netback: Change TX path from grant copy to mapping Zoltan Kiss
2014-01-16 0:01 ` Wei Liu
2014-01-20 17:04 ` Zoltan Kiss
2014-01-14 20:39 ` [PATCH net-next v4 3/9] xen-netback: Remove old TX grant copy definitons and fix indentations Zoltan Kiss
2014-01-16 0:02 ` Wei Liu
2014-01-14 20:39 ` [PATCH net-next v4 4/9] xen-netback: Change RX path for mapped SKB fragments Zoltan Kiss
2014-01-14 20:39 ` Zoltan Kiss [this message]
2014-01-14 20:39 ` [PATCH net-next v4 6/9] xen-netback: Handle guests with too many frags Zoltan Kiss
2014-01-16 0:03 ` Wei Liu
2014-01-20 17:26 ` Zoltan Kiss
2014-01-14 20:39 ` [PATCH net-next v4 7/9] xen-netback: Add stat counters for frag_list skbs Zoltan Kiss
2014-01-14 20:39 ` [PATCH net-next v4 8/9] xen-netback: Timeout packets in RX path Zoltan Kiss
2014-01-16 0:03 ` Wei Liu
2014-01-17 19:27 ` Zoltan Kiss
2014-01-20 16:53 ` Wei Liu
2014-01-20 17:47 ` Zoltan Kiss
2014-01-14 20:39 ` [PATCH net-next v4 9/9] xen-netback: Aggregate TX unmap operations Zoltan Kiss
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