From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pl1-f202.google.com (mail-pl1-f202.google.com [209.85.214.202]) (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 71B1C3090CC for ; Mon, 2 Feb 2026 19:39:37 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770061179; cv=none; b=tUEMCcptgpGkzQQX+zn3I/uebZaRf3jFQMfFX7s+BPsmZoh8f/e+uwGesJHsOea4uOXJRbk41mbZxyQseGl3xbXTE2fiAeumGxxr8v6eP9t7UYMQvaUWkhyPX7wSHWC88TbvB/cKKEqOVxjN/dZaKxSjKVSSfd30X0pR4vEQ27E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770061179; c=relaxed/simple; bh=Kj/aQaeo40aHx4bU8TOzNUGtrh5jbNnKO61YTbpPSwc=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=iA5S2UXaSQAUC5MbdhYlqPmlXSrcsjyxIHFZH/VrQ/X2YcQguQnwgjTRLFOj0Cgc1QoT0Xnk6apm/34TcKVnAeEMGn6/8xtq1kqTXikijAgn5n6WQDgcaYTPizc7mMDJZZeqDZEpXTKOPpKS/uGjFZrBj5nJoDfRXGintJ6Fpas= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--hramamurthy.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=XA2/qTmU; arc=none smtp.client-ip=209.85.214.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--hramamurthy.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="XA2/qTmU" Received: by mail-pl1-f202.google.com with SMTP id d9443c01a7336-2a0bae9acd4so34873985ad.3 for ; Mon, 02 Feb 2026 11:39:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1770061177; x=1770665977; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=SQ5kxBUBFp+SLAVCVX+2wUd953i/3Otxj9GkhrTs9Bw=; b=XA2/qTmU7nVWYiQxyV4J2XHl2Wxg0YQZsAdtyi47PssOYpvK1M/MRb0jkl3VKI+Pcq IQlep8JEX+C6Sb7P5EuEx+O1ABeEIp2SAG+BZtb25EySku2SJDdUyJlwRj6OKnV2ir0+ JFJPZFA0OfyRxxOqNkpt2bu3Q/tHA5QqCDpqlnjPYQ5/5kBbc5UK6cSQR4mfQQu4OYLM K0Pl94DDsqFs3C1+AdAsZavQqYCHpNqkla0vyqSZdH3nPyzmhNZM1Uwx6mT+Ii0tqFi1 bX0rjyPQfQsUgyxAEvWWV/1HMfvBQ2JXx35DQIZyspX1diOx8GlzC8QFn2peQyVwF3nA gxQw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770061177; x=1770665977; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=SQ5kxBUBFp+SLAVCVX+2wUd953i/3Otxj9GkhrTs9Bw=; b=GVFTxJkcUxtyjps7sy84TDFf23WHkzcNdaw7k+mwtYfmvnhmGWicjQEIRtZdK9kc/e DFEM+QineL0QnyyfVTB2wBgCwBCRoxRiJHO33JkWcgaPgeEKeQK6lWTcQ1guUXi1eeBK HvgwGZy8OisXFOyi6a4cWD43eZpiLlQ8A782Cm2DmzSUvEzGncD9Ix3cHBp6w08bp11R 49zAdLXalDZknnnMBTfJ0lPq/iOxhtF9cpoGK5AMd0a4C9fGH5Jr1fBw+ThEqmLt+77o D6zecl4prKgjfqqwQ3nOL46U/NOXoUVzN5HyGquEHnhd+k8ZI9KrR8ph0HEJfB/oXdjr KLxw== X-Gm-Message-State: AOJu0Yw9q+iRbXghEBe31I3+6YvP7/Zh3dlR05yPyeNHW3J/ff370Co3 c9/eOxuxCb/kUlu4kRYf1I10SIFkjHETLVEI5kWlBeWk5I9Kc9wIgzmjOC5C79hTJciLK8qcyEr P/SJvOynppUx0rqGcG9Sdo9h3cw3PusGUvFwK31Pter7Ncl5XN05HPoyHDhbJlC9XlzO+jkNPmN G2rhd6IeyCcfDjkiJ3RNIW5L1MMMb9LfCt67FivOwObDXWqWYNr4rzVaHtBK7XkUI= X-Received: from plqu4.prod.google.com ([2002:a17:902:a604:b0:2a7:cf29:aee1]) (user=hramamurthy job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:ef43:b0:296:2b7a:90cd with SMTP id d9443c01a7336-2a8d990aaebmr132572965ad.32.1770061176414; Mon, 02 Feb 2026 11:39:36 -0800 (PST) Date: Mon, 2 Feb 2026 19:39:24 +0000 In-Reply-To: <20260202193925.3106272-1-hramamurthy@google.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20260202193925.3106272-1-hramamurthy@google.com> X-Mailer: git-send-email 2.53.0.rc1.225.gd81095ad13-goog Message-ID: <20260202193925.3106272-2-hramamurthy@google.com> Subject: [PATCH net 1/2] gve: Fix stats report corruption on queue count change From: Harshitha Ramamurthy To: netdev@vger.kernel.org Cc: joshwash@google.com, hramamurthy@google.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, willemb@google.com, ziweixiao@google.com, jordanrhee@google.com, nktgrg@google.com, kuozhao@google.com, yangchun@google.com, awogbemila@google.com, maolson@google.com, ast@kernel.org, daniel@iogearbox.net, hawk@kernel.org, john.fastabend@gmail.com, sdf@fomichev.me, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.com, Debarghya Kundu , stable@vger.kernel.org Content-Type: text/plain; charset="UTF-8" From: Debarghya Kundu The driver and the NIC share a region in memory for stats reporting. The NIC calculates its offset into this region based on the total size of the stats region and the size of the NIC's stats. When the number of queues is changed, the driver's stats region is resized. If the queue count is increased, the NIC can write past the end of the allocated stats region, causing memory corruption. If the queue count is decreased, there is a gap between the driver and NIC stats, leading to incorrect stats reporting. This change fixes the issue by allocating stats region with maximum size, and the offset calculation for NIC stats is changed to match with the calculation of the NIC. Cc: stable@vger.kernel.org Fixes: 24aeb56f2d38 ("gve: Add Gvnic stats AQ command and ethtool show/set-priv-flags.") Signed-off-by: Debarghya Kundu Reviewed-by: Joshua Washington Signed-off-by: Harshitha Ramamurthy --- drivers/net/ethernet/google/gve/gve_ethtool.c | 54 +++++++++++++++++++++++++--------------- drivers/net/ethernet/google/gve/gve_main.c | 4 +-- 2 files changed, 36 insertions(+), 22 deletions(-) diff --git a/drivers/net/ethernet/google/gve/gve_ethtool.c b/drivers/net/ethernet/google/gve/gve_ethtool.c index 52500ae8..f7864ae7 100644 --- a/drivers/net/ethernet/google/gve/gve_ethtool.c +++ b/drivers/net/ethernet/google/gve/gve_ethtool.c @@ -156,7 +156,8 @@ gve_get_ethtool_stats(struct net_device *netdev, u64 rx_buf_alloc_fail, rx_desc_err_dropped_pkt, rx_hsplit_unsplit_pkt, rx_pkts, rx_hsplit_pkt, rx_skb_alloc_fail, rx_bytes, tx_pkts, tx_bytes, tx_dropped; - int stats_idx, base_stats_idx, max_stats_idx; + int rx_base_stats_idx, max_rx_stats_idx, max_tx_stats_idx; + int stats_idx, stats_region_len, nic_stats_len; struct stats *report_stats; int *rx_qid_to_stats_idx; int *tx_qid_to_stats_idx; @@ -265,20 +266,38 @@ gve_get_ethtool_stats(struct net_device *netdev, data[i++] = priv->stats_report_trigger_cnt; i = GVE_MAIN_STATS_LEN; - /* For rx cross-reporting stats, start from nic rx stats in report */ - base_stats_idx = GVE_TX_STATS_REPORT_NUM * num_tx_queues + - GVE_RX_STATS_REPORT_NUM * priv->rx_cfg.num_queues; - /* The boundary between driver stats and NIC stats shifts if there are - * stopped queues. - */ - base_stats_idx += NIC_RX_STATS_REPORT_NUM * num_stopped_rxqs + - NIC_TX_STATS_REPORT_NUM * num_stopped_txqs; - max_stats_idx = NIC_RX_STATS_REPORT_NUM * - (priv->rx_cfg.num_queues - num_stopped_rxqs) + - base_stats_idx; + rx_base_stats_idx = 0; + max_rx_stats_idx = 0; + max_tx_stats_idx = 0; + stats_region_len = priv->stats_report_len - + sizeof(struct gve_stats_report); + nic_stats_len = (NIC_RX_STATS_REPORT_NUM * priv->rx_cfg.num_queues + + NIC_TX_STATS_REPORT_NUM * num_tx_queues) * sizeof(struct stats); + if (unlikely((stats_region_len - + nic_stats_len) % sizeof(struct stats))) { + net_err_ratelimited("Starting index of NIC stats should be multiple of stats size"); + } else { + /* For rx cross-reporting stats, + * start from nic rx stats in report + */ + rx_base_stats_idx = (stats_region_len - nic_stats_len) / + sizeof(struct stats); + /* The boundary between driver stats and NIC stats + * shifts if there are stopped queues + */ + rx_base_stats_idx += NIC_RX_STATS_REPORT_NUM * + num_stopped_rxqs + NIC_TX_STATS_REPORT_NUM * + num_stopped_txqs; + max_rx_stats_idx = NIC_RX_STATS_REPORT_NUM * + (priv->rx_cfg.num_queues - num_stopped_rxqs) + + rx_base_stats_idx; + max_tx_stats_idx = NIC_TX_STATS_REPORT_NUM * + (num_tx_queues - num_stopped_txqs) + + max_rx_stats_idx; + } /* Preprocess the stats report for rx, map queue id to start index */ skip_nic_stats = false; - for (stats_idx = base_stats_idx; stats_idx < max_stats_idx; + for (stats_idx = rx_base_stats_idx; stats_idx < max_rx_stats_idx; stats_idx += NIC_RX_STATS_REPORT_NUM) { u32 stat_name = be32_to_cpu(report_stats[stats_idx].stat_name); u32 queue_id = be32_to_cpu(report_stats[stats_idx].queue_id); @@ -354,14 +373,9 @@ gve_get_ethtool_stats(struct net_device *netdev, i += priv->rx_cfg.num_queues * NUM_GVE_RX_CNTS; } - /* For tx cross-reporting stats, start from nic tx stats in report */ - base_stats_idx = max_stats_idx; - max_stats_idx = NIC_TX_STATS_REPORT_NUM * - (num_tx_queues - num_stopped_txqs) + - max_stats_idx; - /* Preprocess the stats report for tx, map queue id to start index */ skip_nic_stats = false; - for (stats_idx = base_stats_idx; stats_idx < max_stats_idx; + /* NIC TX stats start right after NIC RX stats */ + for (stats_idx = max_rx_stats_idx; stats_idx < max_tx_stats_idx; stats_idx += NIC_TX_STATS_REPORT_NUM) { u32 stat_name = be32_to_cpu(report_stats[stats_idx].stat_name); u32 queue_id = be32_to_cpu(report_stats[stats_idx].queue_id); diff --git a/drivers/net/ethernet/google/gve/gve_main.c b/drivers/net/ethernet/google/gve/gve_main.c index a7a088a7..5a747603 100644 --- a/drivers/net/ethernet/google/gve/gve_main.c +++ b/drivers/net/ethernet/google/gve/gve_main.c @@ -283,9 +283,9 @@ static int gve_alloc_stats_report(struct gve_priv *priv) int tx_stats_num, rx_stats_num; tx_stats_num = (GVE_TX_STATS_REPORT_NUM + NIC_TX_STATS_REPORT_NUM) * - gve_num_tx_queues(priv); + priv->tx_cfg.max_queues; rx_stats_num = (GVE_RX_STATS_REPORT_NUM + NIC_RX_STATS_REPORT_NUM) * - priv->rx_cfg.num_queues; + priv->rx_cfg.max_queues; priv->stats_report_len = struct_size(priv->stats_report, stats, size_add(tx_stats_num, rx_stats_num)); priv->stats_report = -- 2.53.0.rc1.225.gd81095ad13-goog