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Message-ID: <1412263461.16704.107.camel@edumazet-glaptop2.roam.corp.google.com>
Date: Thu, 02 Oct 2014 08:24:21 -0700
From: Eric Dumazet <eric.dumazet@...il.com>
To: Amir Vadai <amirv@...lanox.com>
Cc: Jesper Dangaard Brouer <brouer@...hat.com>,
TomHerbert <therbert@...gle.com>,
Linux Netdev List <netdev@...r.kernel.org>,
"David S. Miller" <davem@...emloft.net>,
Hannes Frederic Sowa <hannes@...essinduktion.org>,
Florian Westphal <fw@...len.de>,
Daniel Borkmann <dborkman@...hat.com>,
Jamal Hadi Salim <jhs@...atatu.com>,
Alexander Duyck <alexander.duyck@...il.com>,
John Fastabend <john.r.fastabend@...el.com>,
Dave Taht <dave.taht@...il.com>,
Toke Høiland-Jørgensen <toke@...e.dk>
Subject: [PATCH net-next] mlx4: add a new xmit_more counter
From: Eric Dumazet <edumazet@...gle.com>
ethtool -S reports a new counter, tracking number of time doorbell
was not triggered, because skb->xmit_more was set.
$ ethtool -S eth0 | egrep "tx_packet|xmit_more"
tx_packets: 2413288400
xmit_more: 666121277
I merged the tso_packet false sharing avoidance in this patch as well.
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
drivers/net/ethernet/mellanox/mlx4/en_ethtool.c | 1
drivers/net/ethernet/mellanox/mlx4/en_port.c | 17 +++++++++-----
drivers/net/ethernet/mellanox/mlx4/en_tx.c | 4 ++-
drivers/net/ethernet/mellanox/mlx4/mlx4_en.h | 5 +++-
4 files changed, 19 insertions(+), 8 deletions(-)
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
index 35ff2925110a..42c9f8b09a6e 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_ethtool.c
@@ -112,6 +112,7 @@ static const char main_strings[][ETH_GSTRING_LEN] = {
/* port statistics */
"tso_packets",
+ "xmit_more",
"queue_stopped", "wake_queue", "tx_timeout", "rx_alloc_failed",
"rx_csum_good", "rx_csum_none", "tx_chksum_offload",
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_port.c b/drivers/net/ethernet/mellanox/mlx4/en_port.c
index c2cfb05e7290..0a0261d128b9 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_port.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_port.c
@@ -150,14 +150,19 @@ int mlx4_en_DUMP_ETH_STATS(struct mlx4_en_dev *mdev, u8 port, u8 reset)
priv->port_stats.tx_chksum_offload = 0;
priv->port_stats.queue_stopped = 0;
priv->port_stats.wake_queue = 0;
+ priv->port_stats.tso_packets = 0;
+ priv->port_stats.xmit_more = 0;
for (i = 0; i < priv->tx_ring_num; i++) {
- stats->tx_packets += priv->tx_ring[i]->packets;
- stats->tx_bytes += priv->tx_ring[i]->bytes;
- priv->port_stats.tx_chksum_offload += priv->tx_ring[i]->tx_csum;
- priv->port_stats.queue_stopped +=
- priv->tx_ring[i]->queue_stopped;
- priv->port_stats.wake_queue += priv->tx_ring[i]->wake_queue;
+ const struct mlx4_en_tx_ring *ring = priv->tx_ring[i];
+
+ stats->tx_packets += ring->packets;
+ stats->tx_bytes += ring->bytes;
+ priv->port_stats.tx_chksum_offload += ring->tx_csum;
+ priv->port_stats.queue_stopped += ring->queue_stopped;
+ priv->port_stats.wake_queue += ring->wake_queue;
+ priv->port_stats.tso_packets += ring->tso_packets;
+ priv->port_stats.xmit_more += ring->xmit_more;
}
stats->rx_errors = be64_to_cpu(mlx4_en_stats->PCS) +
diff --git a/drivers/net/ethernet/mellanox/mlx4/en_tx.c b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
index adedc47e947d..0c501253fdab 100644
--- a/drivers/net/ethernet/mellanox/mlx4/en_tx.c
+++ b/drivers/net/ethernet/mellanox/mlx4/en_tx.c
@@ -840,7 +840,7 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
* note that we already verified that it is linear */
memcpy(tx_desc->lso.header, skb->data, lso_header_size);
- priv->port_stats.tso_packets++;
+ ring->tso_packets++;
i = ((skb->len - lso_header_size) / skb_shinfo(skb)->gso_size) +
!!((skb->len - lso_header_size) % skb_shinfo(skb)->gso_size);
tx_info->nr_bytes = skb->len + (i - 1) * lso_header_size;
@@ -910,6 +910,8 @@ netdev_tx_t mlx4_en_xmit(struct sk_buff *skb, struct net_device *dev)
wmb();
iowrite32be(ring->doorbell_qpn,
ring->bf.uar->map + MLX4_SEND_DOORBELL);
+ } else {
+ ring->xmit_more++;
}
}
diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
index 6a4fc2394cf2..84c9d5dbfa4f 100644
--- a/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
+++ b/drivers/net/ethernet/mellanox/mlx4/mlx4_en.h
@@ -279,6 +279,8 @@ struct mlx4_en_tx_ring {
unsigned long tx_csum;
unsigned long queue_stopped;
unsigned long wake_queue;
+ unsigned long tso_packets;
+ unsigned long xmit_more;
struct mlx4_bf bf;
bool bf_enabled;
bool bf_alloced;
@@ -426,6 +428,7 @@ struct mlx4_en_pkt_stats {
struct mlx4_en_port_stats {
unsigned long tso_packets;
+ unsigned long xmit_more;
unsigned long queue_stopped;
unsigned long wake_queue;
unsigned long tx_timeout;
@@ -433,7 +436,7 @@ struct mlx4_en_port_stats {
unsigned long rx_chksum_good;
unsigned long rx_chksum_none;
unsigned long tx_chksum_offload;
-#define NUM_PORT_STATS 8
+#define NUM_PORT_STATS 9
};
struct mlx4_en_perf_stats {
--
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