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Date: Tue, 1 Mar 2022 17:02:25 -0800
From: Saeed Mahameed <saeed@...nel.org>
To: Joe Damato <jdamato@...tly.com>
Cc: netdev@...r.kernel.org, kuba@...nel.org,
ilias.apalodimas@...aro.org, davem@...emloft.net, hawk@...nel.org,
ttoukan.linux@...il.com, brouer@...hat.com, leon@...nel.org,
linux-rdma@...r.kernel.org, saeedm@...dia.com
Subject: Re: [net-next v8 4/4] mlx5: add support for page_pool_get_stats
On 01 Mar 14:10, Joe Damato wrote:
>This change adds support for the page_pool_get_stats API to mlx5. If the
>user has enabled CONFIG_PAGE_POOL_STATS in their kernel, ethtool will
>output page pool stats.
>
I was hoping to see something other than ethtool, a driver-less approach,
page_pool is a first class citizen, it collects own stats and should be
able to report own stats without the need for driver help.
I understand these stats are per driver ring, but we can always come up with
a naming convention in the page pool to allow correlating page-pool stats
with per ring driver stats.
Anyway i can't think of a simple hack, so this patch is a good temporary
compromise until we come up with the right approach.
>Signed-off-by: Joe Damato <jdamato@...tly.com>
>---
> drivers/net/ethernet/mellanox/mlx5/core/en_stats.c | 75 ++++++++++++++++++++++
> drivers/net/ethernet/mellanox/mlx5/core/en_stats.h | 27 +++++++-
> 2 files changed, 101 insertions(+), 1 deletion(-)
>
>diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c b/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c
>index 3e5d8c7..eb518ec 100644
>--- a/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c
>+++ b/drivers/net/ethernet/mellanox/mlx5/core/en_stats.c
>@@ -37,6 +37,10 @@
> #include "en/ptp.h"
> #include "en/port.h"
>
>+#ifdef CONFIG_PAGE_POOL_STATS
>+#include <net/page_pool.h>
>+#endif
>+
> static unsigned int stats_grps_num(struct mlx5e_priv *priv)
> {
> return !priv->profile->stats_grps_num ? 0 :
>@@ -183,6 +187,19 @@ static const struct counter_desc sw_stats_desc[] = {
> { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_congst_umr) },
> { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_arfs_err) },
> { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_recover) },
>+#ifdef CONFIG_PAGE_POOL_STATS
>+ { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_alloc_fast) },
>+ { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_alloc_slow) },
>+ { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_alloc_slow_high_order) },
>+ { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_alloc_empty) },
>+ { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_alloc_refill) },
>+ { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_alloc_waive) },
>+ { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_recycle_cached) },
>+ { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_recycle_cache_full) },
>+ { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_recycle_ring) },
>+ { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_recycle_ring_full) },
>+ { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_pp_recycle_released_ref) },
>+#endif
> #ifdef CONFIG_MLX5_EN_TLS
> { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_tls_decrypted_packets) },
> { MLX5E_DECLARE_STAT(struct mlx5e_sw_stats, rx_tls_decrypted_bytes) },
>@@ -349,6 +366,19 @@ static void mlx5e_stats_grp_sw_update_stats_rq_stats(struct mlx5e_sw_stats *s,
> s->rx_congst_umr += rq_stats->congst_umr;
> s->rx_arfs_err += rq_stats->arfs_err;
> s->rx_recover += rq_stats->recover;
>+#ifdef CONFIG_PAGE_POOL_STATS
>+ s->rx_pp_alloc_fast += rq_stats->pp_alloc_fast;
>+ s->rx_pp_alloc_slow += rq_stats->pp_alloc_slow;
>+ s->rx_pp_alloc_empty += rq_stats->pp_alloc_empty;
>+ s->rx_pp_alloc_refill += rq_stats->pp_alloc_refill;
>+ s->rx_pp_alloc_waive += rq_stats->pp_alloc_waive;
>+ s->rx_pp_alloc_slow_high_order += rq_stats->pp_alloc_slow_high_order;
>+ s->rx_pp_recycle_cached += rq_stats->pp_recycle_cached;
>+ s->rx_pp_recycle_cache_full += rq_stats->pp_recycle_cache_full;
>+ s->rx_pp_recycle_ring += rq_stats->pp_recycle_ring;
>+ s->rx_pp_recycle_ring_full += rq_stats->pp_recycle_ring_full;
>+ s->rx_pp_recycle_released_ref += rq_stats->pp_recycle_released_ref;
>+#endif
> #ifdef CONFIG_MLX5_EN_TLS
> s->rx_tls_decrypted_packets += rq_stats->tls_decrypted_packets;
> s->rx_tls_decrypted_bytes += rq_stats->tls_decrypted_bytes;
>@@ -455,6 +485,35 @@ static void mlx5e_stats_grp_sw_update_stats_qos(struct mlx5e_priv *priv,
> }
> }
>
>+#ifdef CONFIG_PAGE_POOL_STATS
>+static void mlx5e_stats_update_stats_rq_page_pool(struct mlx5e_channel *c)
>+{
>+ struct mlx5e_rq_stats *rq_stats = c->rq.stats;
>+ struct page_pool *pool = c->rq.page_pool;
>+ struct page_pool_stats stats = { 0 };
>+
you can drop the 0, just {} should be enough.
>+ if (!page_pool_get_stats(pool, &stats))
>+ return;
>+
you can contain the whole page_pool_stats objects inside rq_stats object,
and avoid all the assignments below.
just do:
page_pool_get_stats(pool, &rq_stats.pp);
return;
>+ rq_stats->pp_alloc_fast = stats.alloc_stats.fast;
>+ rq_stats->pp_alloc_slow = stats.alloc_stats.slow;
>+ rq_stats->pp_alloc_slow_high_order = stats.alloc_stats.slow_high_order;
>+ rq_stats->pp_alloc_empty = stats.alloc_stats.empty;
>+ rq_stats->pp_alloc_waive = stats.alloc_stats.waive;
>+ rq_stats->pp_alloc_refill = stats.alloc_stats.refill;
>+
>+ rq_stats->pp_recycle_cached = stats.recycle_stats.cached;
>+ rq_stats->pp_recycle_cache_full = stats.recycle_stats.cache_full;
>+ rq_stats->pp_recycle_ring = stats.recycle_stats.ring;
>+ rq_stats->pp_recycle_ring_full = stats.recycle_stats.ring_full;
>+ rq_stats->pp_recycle_released_ref = stats.recycle_stats.released_refcnt;
>+}
>+#else
>+static void mlx5e_stats_update_stats_rq_page_pool(struct mlx5e_channel *c)
>+{
>+}
>+#endif
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