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Miller" , Eric Dumazet , Paolo Abeni , David Wei , Shuah Khan , Simon Horman Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Breno Leitao , gustavold@gmail.com, Joe Damato X-Mailer: b4 0.15-dev-42535 X-Developer-Signature: v=1; a=openpgp-sha256; l=4957; i=leitao@debian.org; h=from:subject:message-id; bh=Ya02A6KSQP7IifJw9ze9oqhqSpeNuf34AYwn/7z5joU=; b=owEBbQKS/ZANAwAIATWjk5/8eHdtAcsmYgBoUnm1GhmHtd/d4WZp8ub6yCIp901Fk7R4m/2Nt 3hqhrwkSAyJAjMEAAEIAB0WIQSshTmm6PRnAspKQ5s1o5Of/Hh3bQUCaFJ5tQAKCRA1o5Of/Hh3 bUStEACldGbIVFpgyJ1IDyFif97TLe2MFkPCf2d0h+JsSs3+Pn+gNT5N0S0dfNXMRsyf2NimVzq d/e+neWBtPlNjbBP/w6Zx/5IHQJwFSSClltVfqkoxarEWBbq3jbVlitxshaIEQ5GoaVYgchG0s5 8PDyr65urBbnGdqXewKUFwLPCFxcGEC+jJvR1DtRH2YafFOYAPB2TKNFkY5/jXD7WyStAaLtph1 /P31yQzdizUKKy5tBa/Pd+MoUIF90ZklOx+FqZVSGiGcvz8WuXX/DWz8naKj1GmXP8l+bx70J3l 3ptalNXfd0/de/1N9crPSs1+yplZe8CJb5oeIHjNNnSZTfi7XPmK8qqhCgLmpmB77eATZQAPfUU 03NgI9SrmeHjS4j9NUJSblxiLSpPtVGPRjv8S89tyqAjtQrIVc8wFFz7qAtXX4vfIi2EAb+eY9h JUXZeWfAj5XQHB4cj/BvBerKLlKA+cdZEEOuaDP5HVaSj66imhUplXna2sH3SvMYvpK2VK1SY1J pyWb04FHWKKN9+nKoyUdaUK8fQsWkdPV4Y8Sl/Tnf0GUX1J4kmbyI6ihvrl8N/NOIe34Wd/ZmY8 6LBxXYxwzESlVFtbz6ZqHVvIJm5ORrN8fbzNIwId/cuj26AvSoGI54Gvc9OItwv7Z4tE9OtoFpj li+TXlggYCCFhDg== X-Developer-Key: i=leitao@debian.org; a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D Replace custom statistics tracking with the kernel's dstats infrastructure to simplify code and improve consistency with other network drivers. This change: - Sets dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS for automatic automatic allocation and deallocation. - Removes manual stats fields and their update - Replaces custom nsim_get_stats64() with dev_get_stats() - Uses dev_dstats_tx_add() and dev_dstats_tx_dropped() helpers - Eliminates the need for manual synchronization primitives The dstats framework provides the same functionality with less code. Suggested-by: Jakub Kicinski Reviewed-by: Joe Damato Signed-off-by: Breno Leitao --- drivers/net/netdevsim/netdev.c | 33 ++++++--------------------------- drivers/net/netdevsim/netdevsim.h | 5 ----- 2 files changed, 6 insertions(+), 32 deletions(-) diff --git a/drivers/net/netdevsim/netdev.c b/drivers/net/netdevsim/netdev.c index fa5fbd97ad69e..5010d8eefc854 100644 --- a/drivers/net/netdevsim/netdev.c +++ b/drivers/net/netdevsim/netdev.c @@ -93,19 +93,14 @@ static netdev_tx_t nsim_start_xmit(struct sk_buff *skb, struct net_device *dev) hrtimer_start(&rq->napi_timer, us_to_ktime(5), HRTIMER_MODE_REL); rcu_read_unlock(); - u64_stats_update_begin(&ns->syncp); - ns->tx_packets++; - ns->tx_bytes += len; - u64_stats_update_end(&ns->syncp); + dev_dstats_tx_add(dev, skb->len); return NETDEV_TX_OK; out_drop_free: dev_kfree_skb(skb); out_drop_cnt: rcu_read_unlock(); - u64_stats_update_begin(&ns->syncp); - ns->tx_dropped++; - u64_stats_update_end(&ns->syncp); + dev_dstats_tx_dropped(dev); return NETDEV_TX_OK; } @@ -126,20 +121,6 @@ static int nsim_change_mtu(struct net_device *dev, int new_mtu) return 0; } -static void -nsim_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) -{ - struct netdevsim *ns = netdev_priv(dev); - unsigned int start; - - do { - start = u64_stats_fetch_begin(&ns->syncp); - stats->tx_bytes = ns->tx_bytes; - stats->tx_packets = ns->tx_packets; - stats->tx_dropped = ns->tx_dropped; - } while (u64_stats_fetch_retry(&ns->syncp, start)); -} - static int nsim_setup_tc_block_cb(enum tc_setup_type type, void *type_data, void *cb_priv) { @@ -556,7 +537,6 @@ static const struct net_device_ops nsim_netdev_ops = { .ndo_set_mac_address = eth_mac_addr, .ndo_validate_addr = eth_validate_addr, .ndo_change_mtu = nsim_change_mtu, - .ndo_get_stats64 = nsim_get_stats64, .ndo_set_vf_mac = nsim_set_vf_mac, .ndo_set_vf_vlan = nsim_set_vf_vlan, .ndo_set_vf_rate = nsim_set_vf_rate, @@ -580,7 +560,6 @@ static const struct net_device_ops nsim_vf_netdev_ops = { .ndo_set_mac_address = eth_mac_addr, .ndo_validate_addr = eth_validate_addr, .ndo_change_mtu = nsim_change_mtu, - .ndo_get_stats64 = nsim_get_stats64, .ndo_setup_tc = nsim_setup_tc, .ndo_set_features = nsim_set_features, }; @@ -594,7 +573,7 @@ static void nsim_get_queue_stats_rx(struct net_device *dev, int idx, struct rtnl_link_stats64 rtstats = {}; if (!idx) - nsim_get_stats64(dev, &rtstats); + dev_get_stats(dev, &rtstats); stats->packets = rtstats.rx_packets - !!rtstats.rx_packets; stats->bytes = rtstats.rx_bytes; @@ -606,7 +585,7 @@ static void nsim_get_queue_stats_tx(struct net_device *dev, int idx, struct rtnl_link_stats64 rtstats = {}; if (!idx) - nsim_get_stats64(dev, &rtstats); + dev_get_stats(dev, &rtstats); stats->packets = rtstats.tx_packets - !!rtstats.tx_packets; stats->bytes = rtstats.tx_bytes; @@ -618,7 +597,7 @@ static void nsim_get_base_stats(struct net_device *dev, { struct rtnl_link_stats64 rtstats = {}; - nsim_get_stats64(dev, &rtstats); + dev_get_stats(dev, &rtstats); rx->packets = !!rtstats.rx_packets; rx->bytes = 0; @@ -890,6 +869,7 @@ static void nsim_setup(struct net_device *dev) NETIF_F_HW_CSUM | NETIF_F_LRO | NETIF_F_TSO; + dev->pcpu_stat_type = NETDEV_PCPU_STAT_DSTATS; dev->max_mtu = ETH_MAX_MTU; dev->xdp_features = NETDEV_XDP_ACT_HW_OFFLOAD; } @@ -1022,7 +1002,6 @@ nsim_create(struct nsim_dev *nsim_dev, struct nsim_dev_port *nsim_dev_port) dev_net_set(dev, nsim_dev_net(nsim_dev)); ns = netdev_priv(dev); ns->netdev = dev; - u64_stats_init(&ns->syncp); ns->nsim_dev = nsim_dev; ns->nsim_dev_port = nsim_dev_port; ns->nsim_bus_dev = nsim_dev->nsim_bus_dev; diff --git a/drivers/net/netdevsim/netdevsim.h b/drivers/net/netdevsim/netdevsim.h index d04401f0bdf79..343b8f19dbed6 100644 --- a/drivers/net/netdevsim/netdevsim.h +++ b/drivers/net/netdevsim/netdevsim.h @@ -108,11 +108,6 @@ struct netdevsim { int rq_reset_mode; - u64 tx_packets; - u64 tx_bytes; - u64 tx_dropped; - struct u64_stats_sync syncp; - struct nsim_bus_dev *nsim_bus_dev; struct bpf_prog *bpf_offloaded; From patchwork Wed Jun 18 08:32:44 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Breno Leitao X-Patchwork-Id: 897789 Received: from mail-ej1-f47.google.com (mail-ej1-f47.google.com [209.85.218.47]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9D3C727FD5A; 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Wed, 18 Jun 2025 01:32:59 -0700 (PDT) Received: from localhost ([2a03:2880:30ff:2::]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-adec892b024sm1000863366b.130.2025.06.18.01.32.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 Jun 2025 01:32:59 -0700 (PDT) From: Breno Leitao Date: Wed, 18 Jun 2025 01:32:44 -0700 Subject: [PATCH net-next v4 3/4] net: add dev_dstats_rx_dropped_add() helper Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20250618-netdevsim_stat-v4-3-19fe0d35e28e@debian.org> References: <20250618-netdevsim_stat-v4-0-19fe0d35e28e@debian.org> In-Reply-To: <20250618-netdevsim_stat-v4-0-19fe0d35e28e@debian.org> To: Jakub Kicinski , Andrew Lunn , "David S. Miller" , Eric Dumazet , Paolo Abeni , David Wei , Shuah Khan , Simon Horman Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Breno Leitao , gustavold@gmail.com, Joe Damato X-Mailer: b4 0.15-dev-42535 X-Developer-Signature: v=1; a=openpgp-sha256; l=1197; i=leitao@debian.org; h=from:subject:message-id; bh=pun+ai7i9KoSJwqGh21Y7Vt3za1e9TA2aXklqAhyP90=; b=owEBbQKS/ZANAwAIATWjk5/8eHdtAcsmYgBoUnm1mwbJrwv0YDwYDDNXccLkbOic+BzOVdpdn WMtG5PmJCOJAjMEAAEIAB0WIQSshTmm6PRnAspKQ5s1o5Of/Hh3bQUCaFJ5tQAKCRA1o5Of/Hh3 beAJEACvhn0olRdl4m8biKIukOMbdjGI/RjV2lIT17X1e2VOxAlVLUVdpVmSgwswF4kb1BmlqZM EAHJ4/JlsRdikQkZbAbZoHA4RsVR1revLnqgNDmo8eKI9okA19uH0KWW9Ln+QdURnkbdAVH1Acb g2f+oaDq/d1SCJysg6UrHM2wzezFDKVUUrh6UkjXZQIYAlZWvNYjNkeEzmGYzLQSbvfGmh3xtH6 3H5+kkcbLus8lLcCw/q65OU53+rMTYJ6kesvmDwyhYOChkThE+5W6dtcjpetB0JJDxR+LilMSIT qLvjt74Cb9psQBR9XYgro2zHxOKM4HlUmENh/IZg2H+mHovtt+bBpI3CT+Kiy03MD5wJyG6ir1G qaPF5nPpyO7RXm2xTrUF8cv0RZ3OvopKqwGxiQov2mIx7mKuk7GmDaK+Pv1vgvyZ5MlEg79C/cX uM8T0uAO74Mzxn0SozhEFkb6kxXTGPspYrW3kcd+Y3F+CroielSPUlK+ZhHw5G36s1+b5JMZLbT zK3gbv4XwyHit9H+9WQ55Adcf+rlHOuCjSypjM4HAKDH1Zcb0MuoePofSQlV/BnAMnKGoTViHtE LjdbdS+o/PLe7qFX7cTH7ZLZZ6jIzq85FDda5x4ihe+NouMqMPgud/LLzD1iR5hXmX0gZE7Kuu1 ODvwXKGjWHHebsQ== X-Developer-Key: i=leitao@debian.org; a=openpgp; fpr=AC8539A6E8F46702CA4A439B35A3939FFC78776D Introduce the dev_dstats_rx_dropped_add() helper to allow incrementing the rx_drops per-CPU statistic by an arbitrary value, rather than just one. This is useful for drivers or code paths that need to account for multiple dropped packets at once, such as when dropping entire queues. Reviewed-by: Joe Damato Signed-off-by: Breno Leitao --- include/linux/netdevice.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h index 9cbc4e54b7e4a..03c26bb0fbbef 100644 --- a/include/linux/netdevice.h +++ b/include/linux/netdevice.h @@ -3016,6 +3016,16 @@ static inline void dev_dstats_rx_dropped(struct net_device *dev) u64_stats_update_end(&dstats->syncp); } +static inline void dev_dstats_rx_dropped_add(struct net_device *dev, + unsigned int packets) +{ + struct pcpu_dstats *dstats = this_cpu_ptr(dev->dstats); + + u64_stats_update_begin(&dstats->syncp); + u64_stats_add(&dstats->rx_drops, packets); + u64_stats_update_end(&dstats->syncp); +} + static inline void dev_dstats_tx_add(struct net_device *dev, unsigned int len) {