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Message-ID: <54cf35ea0d5c0ec46e0717a6181daaa2419ca91e.1724852597.git.ecree.xilinx@gmail.com>
Date: Wed, 28 Aug 2024 14:45:11 +0100
From: <edward.cree@....com>
To: <linux-net-drivers@....com>, <davem@...emloft.net>, <kuba@...nel.org>,
<edumazet@...gle.com>, <pabeni@...hat.com>
CC: Edward Cree <ecree.xilinx@...il.com>, <netdev@...r.kernel.org>
Subject: [PATCH net-next 2/6] sfc: implement basic per-queue stats
From: Edward Cree <ecree.xilinx@...il.com>
Just RX and TX packet counts for now. We do not have per-queue
byte counts, which causes us to fail stats.pkt_byte_sum selftest
with "Drivers should always report basic keys" error.
Per-queue counts are since the last time the queue was inited
(typically by efx_start_datapath(), on ifup or reconfiguration);
device-wide total (efx_get_base_stats()) is since driver probe.
This is not the same lifetime as rtnl_link_stats64, which uses
firmware stats which count since FW (re)booted; this can cause a
"Qstats are lower" or "RTNL stats are lower" failure in
stats.pkt_byte_sum selftest.
Move the increment of rx_queue->rx_packets to match the semantics
specified for netdev per-queue stats, i.e. just before handing
the packet to XDP (if present) or the netstack (through GRO).
This will affect the existing ethtool -S output which also
reports these counters.
Signed-off-by: Edward Cree <ecree.xilinx@...il.com>
---
drivers/net/ethernet/sfc/ef100_rx.c | 4 +-
drivers/net/ethernet/sfc/efx.c | 72 +++++++++++++++++++++++++
drivers/net/ethernet/sfc/efx_channels.h | 1 -
drivers/net/ethernet/sfc/net_driver.h | 6 +++
drivers/net/ethernet/sfc/rx.c | 4 +-
drivers/net/ethernet/sfc/rx_common.c | 2 +
drivers/net/ethernet/sfc/tx_common.c | 2 +
7 files changed, 86 insertions(+), 5 deletions(-)
diff --git a/drivers/net/ethernet/sfc/ef100_rx.c b/drivers/net/ethernet/sfc/ef100_rx.c
index 83d9db71d7d7..992151775cb8 100644
--- a/drivers/net/ethernet/sfc/ef100_rx.c
+++ b/drivers/net/ethernet/sfc/ef100_rx.c
@@ -134,6 +134,8 @@ void __ef100_rx_packet(struct efx_channel *channel)
goto free_rx_buffer;
}
+ ++rx_queue->rx_packets;
+
efx_rx_packet_gro(channel, rx_buf, channel->rx_pkt_n_frags, eh, csum);
goto out;
@@ -149,8 +151,6 @@ static void ef100_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index)
struct efx_channel *channel = efx_rx_queue_channel(rx_queue);
struct efx_nic *efx = rx_queue->efx;
- ++rx_queue->rx_packets;
-
netif_vdbg(efx, rx_status, efx->net_dev,
"RX queue %d received id %x\n",
efx_rx_queue_index(rx_queue), index);
diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c
index 6f1a01ded7d4..e4656efce969 100644
--- a/drivers/net/ethernet/sfc/efx.c
+++ b/drivers/net/ethernet/sfc/efx.c
@@ -22,6 +22,7 @@
#include "net_driver.h"
#include <net/gre.h>
#include <net/udp_tunnel.h>
+#include <net/netdev_queues.h>
#include "efx.h"
#include "efx_common.h"
#include "efx_channels.h"
@@ -626,6 +627,76 @@ static const struct net_device_ops efx_netdev_ops = {
.ndo_bpf = efx_xdp
};
+static void efx_get_queue_stats_rx(struct net_device *net_dev, int idx,
+ struct netdev_queue_stats_rx *stats)
+{
+ struct efx_nic *efx = efx_netdev_priv(net_dev);
+ struct efx_rx_queue *rx_queue;
+ struct efx_channel *channel;
+
+ channel = efx_get_channel(efx, idx);
+ rx_queue = efx_channel_get_rx_queue(channel);
+ /* Count only packets since last time datapath was started */
+ stats->packets = rx_queue->rx_packets - rx_queue->old_rx_packets;
+}
+
+static void efx_get_queue_stats_tx(struct net_device *net_dev, int idx,
+ struct netdev_queue_stats_tx *stats)
+{
+ struct efx_nic *efx = efx_netdev_priv(net_dev);
+ struct efx_tx_queue *tx_queue;
+ struct efx_channel *channel;
+
+ channel = efx_get_tx_channel(efx, idx);
+ stats->packets = 0;
+ /* If a TX channel has XDP TXQs, the stats for these will be counted
+ * under the channel rather than in base stats. Unclear whether this
+ * is correct behaviour, but we can't reliably exclude XDP TXes from
+ * these stats anyway because in EFX_XDP_TX_QUEUES_BORROWED we use
+ * the same TXQ as the core.
+ */
+ efx_for_each_channel_tx_queue(tx_queue, channel)
+ stats->packets += tx_queue->tx_packets - tx_queue->old_tx_packets;
+}
+
+static void efx_get_base_stats(struct net_device *net_dev,
+ struct netdev_queue_stats_rx *rx,
+ struct netdev_queue_stats_tx *tx)
+{
+ struct efx_nic *efx = efx_netdev_priv(net_dev);
+ struct efx_tx_queue *tx_queue;
+ struct efx_rx_queue *rx_queue;
+ struct efx_channel *channel;
+
+ rx->packets = 0;
+ tx->packets = 0;
+
+ /* Count all packets on non-core queues, and packets before last
+ * datapath start on core queues.
+ */
+ efx_for_each_channel(channel, efx) {
+ rx_queue = efx_channel_get_rx_queue(channel);
+ if (channel->channel >= net_dev->real_num_rx_queues)
+ rx->packets += rx_queue->rx_packets;
+ else
+ rx->packets += rx_queue->old_rx_packets;
+ efx_for_each_channel_tx_queue(tx_queue, channel) {
+ if (channel->channel < efx->tx_channel_offset ||
+ channel->channel >= efx->tx_channel_offset +
+ net_dev->real_num_tx_queues)
+ tx->packets += tx_queue->tx_packets;
+ else
+ tx->packets += tx_queue->old_tx_packets;
+ }
+ }
+}
+
+static const struct netdev_stat_ops efx_stat_ops = {
+ .get_queue_stats_rx = efx_get_queue_stats_rx,
+ .get_queue_stats_tx = efx_get_queue_stats_tx,
+ .get_base_stats = efx_get_base_stats,
+};
+
static int efx_xdp_setup_prog(struct efx_nic *efx, struct bpf_prog *prog)
{
struct bpf_prog *old_prog;
@@ -716,6 +787,7 @@ static int efx_register_netdev(struct efx_nic *efx)
net_dev->watchdog_timeo = 5 * HZ;
net_dev->irq = efx->pci_dev->irq;
net_dev->netdev_ops = &efx_netdev_ops;
+ net_dev->stat_ops = &efx_stat_ops;
if (efx_nic_rev(efx) >= EFX_REV_HUNT_A0)
net_dev->priv_flags |= IFF_UNICAST_FLT;
net_dev->ethtool_ops = &efx_ethtool_ops;
diff --git a/drivers/net/ethernet/sfc/efx_channels.h b/drivers/net/ethernet/sfc/efx_channels.h
index 46b702648721..b3b5e18a69cc 100644
--- a/drivers/net/ethernet/sfc/efx_channels.h
+++ b/drivers/net/ethernet/sfc/efx_channels.h
@@ -49,5 +49,4 @@ void efx_fini_napi_channel(struct efx_channel *channel);
void efx_fini_napi(struct efx_nic *efx);
void efx_channel_dummy_op_void(struct efx_channel *channel);
-
#endif
diff --git a/drivers/net/ethernet/sfc/net_driver.h b/drivers/net/ethernet/sfc/net_driver.h
index 4d904e1404d4..cc96716d8dbe 100644
--- a/drivers/net/ethernet/sfc/net_driver.h
+++ b/drivers/net/ethernet/sfc/net_driver.h
@@ -232,6 +232,8 @@ struct efx_tx_buffer {
* @xmit_pending: Are any packets waiting to be pushed to the NIC
* @cb_packets: Number of times the TX copybreak feature has been used
* @notify_count: Count of notified descriptors to the NIC
+ * @tx_packets: Number of packets sent since this struct was created
+ * @old_tx_packets: Value of @tx_packets as of last efx_init_tx_queue()
* @empty_read_count: If the completion path has seen the queue as empty
* and the transmission path has not yet checked this, the value of
* @read_count bitwise-added to %EFX_EMPTY_COUNT_VALID; otherwise 0.
@@ -281,6 +283,7 @@ struct efx_tx_queue {
unsigned int notify_count;
/* Statistics to supplement MAC stats */
unsigned long tx_packets;
+ unsigned long old_tx_packets;
/* Members shared between paths and sometimes updated */
unsigned int empty_read_count ____cacheline_aligned_in_smp;
@@ -370,6 +373,8 @@ struct efx_rx_page_state {
* @recycle_count: RX buffer recycle counter.
* @slow_fill: Timer used to defer efx_nic_generate_fill_event().
* @grant_work: workitem used to grant credits to the MAE if @grant_credits
+ * @rx_packets: Number of packets received since this struct was created
+ * @old_rx_packets: Value of @rx_packets as of last efx_init_rx_queue()
* @xdp_rxq_info: XDP specific RX queue information.
* @xdp_rxq_info_valid: Is xdp_rxq_info valid data?.
*/
@@ -406,6 +411,7 @@ struct efx_rx_queue {
struct work_struct grant_work;
/* Statistics to supplement MAC stats */
unsigned long rx_packets;
+ unsigned long old_rx_packets;
struct xdp_rxq_info xdp_rxq_info;
bool xdp_rxq_info_valid;
};
diff --git a/drivers/net/ethernet/sfc/rx.c b/drivers/net/ethernet/sfc/rx.c
index f77a2d3ef37e..f07495582125 100644
--- a/drivers/net/ethernet/sfc/rx.c
+++ b/drivers/net/ethernet/sfc/rx.c
@@ -125,8 +125,6 @@ void efx_rx_packet(struct efx_rx_queue *rx_queue, unsigned int index,
struct efx_channel *channel = efx_rx_queue_channel(rx_queue);
struct efx_rx_buffer *rx_buf;
- rx_queue->rx_packets++;
-
rx_buf = efx_rx_buffer(rx_queue, index);
rx_buf->flags |= flags;
@@ -394,6 +392,8 @@ void __efx_rx_packet(struct efx_channel *channel)
goto out;
}
+ rx_queue->rx_packets++;
+
if (!efx_do_xdp(efx, channel, rx_buf, &eh))
goto out;
diff --git a/drivers/net/ethernet/sfc/rx_common.c b/drivers/net/ethernet/sfc/rx_common.c
index 0b7dc75c40f9..bdb4325a7c2c 100644
--- a/drivers/net/ethernet/sfc/rx_common.c
+++ b/drivers/net/ethernet/sfc/rx_common.c
@@ -241,6 +241,8 @@ void efx_init_rx_queue(struct efx_rx_queue *rx_queue)
rx_queue->page_recycle_failed = 0;
rx_queue->page_recycle_full = 0;
+ rx_queue->old_rx_packets = rx_queue->rx_packets;
+
/* Initialise limit fields */
max_fill = efx->rxq_entries - EFX_RXD_HEAD_ROOM;
max_trigger =
diff --git a/drivers/net/ethernet/sfc/tx_common.c b/drivers/net/ethernet/sfc/tx_common.c
index 2adb132b2f7e..f1694900e0f0 100644
--- a/drivers/net/ethernet/sfc/tx_common.c
+++ b/drivers/net/ethernet/sfc/tx_common.c
@@ -86,6 +86,8 @@ void efx_init_tx_queue(struct efx_tx_queue *tx_queue)
tx_queue->completed_timestamp_major = 0;
tx_queue->completed_timestamp_minor = 0;
+ tx_queue->old_tx_packets = tx_queue->tx_packets;
+
tx_queue->xdp_tx = efx_channel_is_xdp_tx(tx_queue->channel);
tx_queue->tso_version = 0;
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