5.15-stable review patch. If anyone has any objections, please let me know.
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From: Jesse Brandeburg jesse.brandeburg@intel.com
commit 1a0f25a52e08b1f67510cabbb44888d2b3c46359 upstream.
The driver was zeroing live stats that could be fetched by ndo_get_stats64 at any time. This could result in inconsistent statistics, and the telltale sign was when reading stats frequently from /proc/net/dev, the stats would go backwards.
Fix by collecting stats into a local, and delaying when we write to the structure so it's not incremental.
Fixes: fcea6f3da546 ("ice: Add stats and ethtool support") Signed-off-by: Jesse Brandeburg jesse.brandeburg@intel.com Tested-by: Gurucharan G gurucharanx.g@intel.com Signed-off-by: Tony Nguyen anthony.l.nguyen@intel.com Closes: https://lore.kernel.org/intel-wired-lan/CAP8M2pGttT4JBjt+i4GJkxy7yERbqWJ5a8R... Signed-off-by: Przemek Kitszel przemyslaw.kitszel@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/intel/ice/ice_main.c | 29 ++++++++++++++++++----------- 1 file changed, 18 insertions(+), 11 deletions(-)
--- a/drivers/net/ethernet/intel/ice/ice_main.c +++ b/drivers/net/ethernet/intel/ice/ice_main.c @@ -5731,14 +5731,15 @@ ice_fetch_u64_stats_per_ring(struct ice_ /** * ice_update_vsi_tx_ring_stats - Update VSI Tx ring stats counters * @vsi: the VSI to be updated + * @vsi_stats: the stats struct to be updated * @rings: rings to work on * @count: number of rings */ static void -ice_update_vsi_tx_ring_stats(struct ice_vsi *vsi, struct ice_ring **rings, - u16 count) +ice_update_vsi_tx_ring_stats(struct ice_vsi *vsi, + struct rtnl_link_stats64 *vsi_stats, + struct ice_ring **rings, u16 count) { - struct rtnl_link_stats64 *vsi_stats = &vsi->net_stats; u16 i;
for (i = 0; i < count; i++) { @@ -5761,15 +5762,13 @@ ice_update_vsi_tx_ring_stats(struct ice_ */ static void ice_update_vsi_ring_stats(struct ice_vsi *vsi) { - struct rtnl_link_stats64 *vsi_stats = &vsi->net_stats; + struct rtnl_link_stats64 *vsi_stats; u64 pkts, bytes; int i;
- /* reset netdev stats */ - vsi_stats->tx_packets = 0; - vsi_stats->tx_bytes = 0; - vsi_stats->rx_packets = 0; - vsi_stats->rx_bytes = 0; + vsi_stats = kzalloc(sizeof(*vsi_stats), GFP_ATOMIC); + if (!vsi_stats) + return;
/* reset non-netdev (extended) stats */ vsi->tx_restart = 0; @@ -5781,7 +5780,8 @@ static void ice_update_vsi_ring_stats(st rcu_read_lock();
/* update Tx rings counters */ - ice_update_vsi_tx_ring_stats(vsi, vsi->tx_rings, vsi->num_txq); + ice_update_vsi_tx_ring_stats(vsi, vsi_stats, vsi->tx_rings, + vsi->num_txq);
/* update Rx rings counters */ ice_for_each_rxq(vsi, i) { @@ -5796,10 +5796,17 @@ static void ice_update_vsi_ring_stats(st
/* update XDP Tx rings counters */ if (ice_is_xdp_ena_vsi(vsi)) - ice_update_vsi_tx_ring_stats(vsi, vsi->xdp_rings, + ice_update_vsi_tx_ring_stats(vsi, vsi_stats, vsi->xdp_rings, vsi->num_xdp_txq);
rcu_read_unlock(); + + vsi->net_stats.tx_packets = vsi_stats->tx_packets; + vsi->net_stats.tx_bytes = vsi_stats->tx_bytes; + vsi->net_stats.rx_packets = vsi_stats->rx_packets; + vsi->net_stats.rx_bytes = vsi_stats->rx_bytes; + + kfree(vsi_stats); }
/**