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Date: Fri, 27 Jan 2017 00:18:09 +0200
From: Netanel Belgazal <netanel@...apurnalabs.com>
To: linux-kernel@...r.kernel.org, davem@...emloft.net,
netdev@...r.kernel.org
Cc: Netanel Belgazal <netanel@...apurnalabs.com>, dwmw@...zon.com,
zorik@...apurnalabs.com, alex@...apurnalabs.com,
saeed@...apurnalabs.com, msw@...zon.com, aliguori@...zon.com,
nafea@...apurnalabs.com, eric.dumazet@...il.com
Subject: [PATCH V3 net-next 07/14] net/ena: refactor ena_get_stats64 to be atomic context safe
ndo_get_stat64() can be called from atomic context, but the current
implementation sends an admin command to retrieve the statistics from
the device. This admin command can sleep.
This patch re-factors the implementation of ena_get_stats64() to use
the {rx,tx}bytes/count from the driver's inner counters, and to obtain
the rx drop counter from the asynchronous keep alive (heart bit)
event.
Signed-off-by: Netanel Belgazal <netanel@...apurnalabs.com>
---
drivers/net/ethernet/amazon/ena/ena_admin_defs.h | 8 ++++
drivers/net/ethernet/amazon/ena/ena_netdev.c | 57 +++++++++++++++++-------
drivers/net/ethernet/amazon/ena/ena_netdev.h | 1 +
3 files changed, 51 insertions(+), 15 deletions(-)
diff --git a/drivers/net/ethernet/amazon/ena/ena_admin_defs.h b/drivers/net/ethernet/amazon/ena/ena_admin_defs.h
index e1594d6..5b6509d 100644
--- a/drivers/net/ethernet/amazon/ena/ena_admin_defs.h
+++ b/drivers/net/ethernet/amazon/ena/ena_admin_defs.h
@@ -873,6 +873,14 @@ struct ena_admin_aenq_link_change_desc {
u32 flags;
};
+struct ena_admin_aenq_keep_alive_desc {
+ struct ena_admin_aenq_common_desc aenq_common_desc;
+
+ u32 rx_drops_low;
+
+ u32 rx_drops_high;
+};
+
struct ena_admin_ena_mmio_req_read_less_resp {
u16 req_id;
diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.c b/drivers/net/ethernet/amazon/ena/ena_netdev.c
index 639f0aa..ea3c801 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.c
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.c
@@ -2169,28 +2169,46 @@ static struct rtnl_link_stats64 *ena_get_stats64(struct net_device *netdev,
struct rtnl_link_stats64 *stats)
{
struct ena_adapter *adapter = netdev_priv(netdev);
- struct ena_admin_basic_stats ena_stats;
- int rc;
+ struct ena_ring *rx_ring, *tx_ring;
+ unsigned int start;
+ u64 rx_drops;
+ int i;
if (!test_bit(ENA_FLAG_DEV_UP, &adapter->flags))
return NULL;
- rc = ena_com_get_dev_basic_stats(adapter->ena_dev, &ena_stats);
- if (rc)
- return NULL;
+ for (i = 0; i < adapter->num_queues; i++) {
+ u64 bytes, packets;
+
+ tx_ring = &adapter->tx_ring[i];
+
+ do {
+ start = u64_stats_fetch_begin_irq(&tx_ring->syncp);
+ packets = tx_ring->tx_stats.cnt;
+ bytes = tx_ring->tx_stats.bytes;
+ } while (u64_stats_fetch_retry_irq(&tx_ring->syncp, start));
+
+ stats->tx_packets += packets;
+ stats->tx_bytes += bytes;
- stats->tx_bytes = ((u64)ena_stats.tx_bytes_high << 32) |
- ena_stats.tx_bytes_low;
- stats->rx_bytes = ((u64)ena_stats.rx_bytes_high << 32) |
- ena_stats.rx_bytes_low;
+ rx_ring = &adapter->rx_ring[i];
+
+ do {
+ start = u64_stats_fetch_begin_irq(&rx_ring->syncp);
+ packets = rx_ring->rx_stats.cnt;
+ bytes = rx_ring->rx_stats.bytes;
+ } while (u64_stats_fetch_retry_irq(&rx_ring->syncp, start));
- stats->rx_packets = ((u64)ena_stats.rx_pkts_high << 32) |
- ena_stats.rx_pkts_low;
- stats->tx_packets = ((u64)ena_stats.tx_pkts_high << 32) |
- ena_stats.tx_pkts_low;
+ stats->rx_packets += packets;
+ stats->rx_bytes += bytes;
+ }
+
+ do {
+ start = u64_stats_fetch_begin_irq(&adapter->syncp);
+ rx_drops = adapter->dev_stats.rx_drops;
+ } while (u64_stats_fetch_retry_irq(&adapter->syncp, start));
- stats->rx_dropped = ((u64)ena_stats.rx_drops_high << 32) |
- ena_stats.rx_drops_low;
+ stats->rx_dropped = rx_drops;
stats->multicast = 0;
stats->collisions = 0;
@@ -3213,8 +3231,17 @@ static void ena_keep_alive_wd(void *adapter_data,
struct ena_admin_aenq_entry *aenq_e)
{
struct ena_adapter *adapter = (struct ena_adapter *)adapter_data;
+ struct ena_admin_aenq_keep_alive_desc *desc;
+ u64 rx_drops;
+ desc = (struct ena_admin_aenq_keep_alive_desc *)aenq_e;
adapter->last_keep_alive_jiffies = jiffies;
+
+ rx_drops = ((u64)desc->rx_drops_high << 32) | desc->rx_drops_low;
+
+ u64_stats_update_begin(&adapter->syncp);
+ adapter->dev_stats.rx_drops = rx_drops;
+ u64_stats_update_end(&adapter->syncp);
}
static void ena_notification(void *adapter_data,
diff --git a/drivers/net/ethernet/amazon/ena/ena_netdev.h b/drivers/net/ethernet/amazon/ena/ena_netdev.h
index 69d7e9e..f0ddc11 100644
--- a/drivers/net/ethernet/amazon/ena/ena_netdev.h
+++ b/drivers/net/ethernet/amazon/ena/ena_netdev.h
@@ -241,6 +241,7 @@ struct ena_stats_dev {
u64 interface_up;
u64 interface_down;
u64 admin_q_pause;
+ u64 rx_drops;
};
enum ena_flags_t {
--
2.7.4
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