From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pz2-f1.google.com (mail-pz2-f1.google.com [74.125.228.1]) (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 0517148424D for ; Wed, 19 Aug 2026 16:05:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.228.1 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787155543; cv=none; b=KslRTqajHP89W2ldDXaZPe4gaG3XwlKjZXy/Bk4F6l/uaeJKTpJ9FEkLM7vF8JOwj1YIRmmfCsJt4MXsjuS/7osmprosnB1FW3zfgRousFTk2dPZHY9PcJOhRcYi0QD1ymX9FmHTQybzfQv751lZu98qdzyq6x0Io4h4000SKLM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787155543; c=relaxed/simple; bh=h/yRTy+q/aTNWgdAyARpnxO02skNFXM6ZPvX24ue7RU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=NSrXLAfzBusBniiHH9+3t76aUFZsPoy8xs8xJCZVb4hs1wPeQGxJ4TgexRoORdbX+bUthKfHT7amu7iYzynpH4uIk56nXqTY1+rzaF76ep3cZ4FIdC6aPYn6WN8/yxTlt06BUl1mGBNm3MiHLvKYKLnsClbnHMCb4g++6WX3a8I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=SqKnIAEV; arc=none smtp.client-ip=74.125.228.1 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="SqKnIAEV" Received: by mail-pz2-f1.google.com with SMTP id 41be03b00d2f7-cbb8ebaca74so480383a12.1 for ; Wed, 19 Aug 2026 09:05:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1787155540; x=1787760340; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to:content-type; bh=knHPZ2hqDlF6r7lICpyiSankCSnQUl1ZecmnK0yjr1w=; b=SqKnIAEVzE6ey1YH6WKmKdq8rqQVdIJ82Zu8D/ppptSaaf18B6po5czRgTNQ8FMYAS bjx3QNg91iHQ19+oz0q/qOVzuy2flTwPjrBtrjhUonc0doeAet3vAAIgr/8qnngn9Jiw OlfHAtXMNbAmZJRhY1BVHtfSr9/6KX4r2j2MXatRTg7pSR7HBnB4eC700bH3mSS1JVWf IunyYKl2gkewa+WFuhJQjtQYYzJU6Pa1JA2OZCF9hfmFoDYxdMEWRNCwCfxCEdyqJmct DaCC8hXQ6If10Ko/o/39jxsCf/NZoFAGoE4tE/Yez3SPcSDO7zWttMt6Cl5juPUUqp0F tfvA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787155540; x=1787760340; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to:content-type; bh=knHPZ2hqDlF6r7lICpyiSankCSnQUl1ZecmnK0yjr1w=; b=l2CVBy94Cj8CBnDA8bEH6RD8gEAUI0g/pemCIYIPVHwXOYv0kmoNnRtUFSu3UZfY+T Rn7T+rw/sasstS/3Tjm3oRP8HIRuTDtq8H0WlPOk7m5afELMtQAWPTU5xwG1qgbIL48H eu/CjhdHf2J/HpS/k1L94avh1zvobDTnoKKjroFKz5fXqKjzYEgGacJUR2PeFFQzbYNI MY3Kz2O9br68+hw290+TlV1tocnne+vyiOfkpJmvhH5qV6TDk3pUfHajzsd6jek24HY8 D4yLB28JAh0UVvqLR3ceMeNTvEJqTFXRRSAN0wK1DS2/U+nYVidNicKIAwsSgtzqpQy3 JOlA== X-Gm-Message-State: AOJu0YybHJJOqB+eUIfqW5/NKqEj4uROBLuaRkalRlcPEuvaUgKLt+cw u7PkfBsQrnnZXuFlVnySIH1z7jooqtz1ny3QsIAw83Z0C51i9w7TfcZmi5WVl4Yi X-Gm-Gg: AR+sD12kJjtDpeFEkiG583Z49gJD+CGZR/Bn3MSwzZqYf5pZrTOGaohaUQBeyd0asa2 QV3RtLzTNBmzi1rWmi4NkBozzTtBHGyW0RjlICFlcG55QnMQ4Akkh7E+CofyKHR5jdMAyiJcv9S dZ6KyCreYltHMVmpzwCFdu90jLFrCjWKDo84v5hiP9yqc+GuyDSRlEtYUnEXwCWvI9zqzjun4uQ tAbdfo8ieYeBYmgTgAAjTdJhFLvUIYsuMQJw0lHlqcJTz3qlgva2XhymZ0gjSEGihvjpf65NN6t QwmKbyidWoBW//RLYME/y1872dN0B/vXng9rJ+xLu+IkGKdTxltORTExf2UlqTc7jmIu4RHWvEO FMEF7dtsfDEG3VxyC+mGs16be5aBxGsoZX7Zf0jepT44p+YdDA9soc3xElhD5kJMsCuCJHZwKR+ WDPtKfatjsUqQhjtJxjTbbvWwU8ufxyNYkJ8PzNaNrEppmz6WezTD+98Kq3TJkRwNo X-Received: by 2002:a05:6a00:bd90:b0:848:2e7e:353a with SMTP id d2e1a72fcca58-851d3481104mr8568063b3a.0.1787155540004; Wed, 19 Aug 2026 09:05:40 -0700 (PDT) Received: from localhost ([2a03:2880:2ff:46::]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-851d33b82bbsm857116b3a.24.2026.08.19.09.05.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 19 Aug 2026 09:05:39 -0700 (PDT) From: Stanislav Fomichev X-Google-Original-From: Stanislav Fomichev To: netdev@vger.kernel.org Cc: davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, anthony.l.nguyen@intel.com, przemyslaw.kitszel@intel.com, andrew+netdev@lunn.ch, saeedm@nvidia.com, tariqt@nvidia.com, mbloch@nvidia.com, maxime.chevallier@bootlin.com, mcoquelin.stm32@gmail.com, alexandre.torgue@foss.st.com, aleksander.lobakin@intel.com, horms@kernel.org, magnus.karlsson@intel.com, maciej.fijalkowski@intel.com, sdf@fomichev.me, ast@kernel.org, daniel@iogearbox.net, hawk@kernel.org, john.fastabend@gmail.com, guoren@kernel.org, dtatulea@nvidia.com, witu@nvidia.com, martin.lau@kernel.org, yoong.siang.song@intel.com, intel-wired-lan@lists.osuosl.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, bpf@vger.kernel.org, linux-csky@vger.kernel.org, leon@kernel.org Subject: [PATCH net v3 2/3] xsk: honor XDP_TX_METADATA in zero-copy path Date: Wed, 19 Aug 2026 09:05:34 -0700 Message-ID: <20260819160535.1472459-3-sdf@fomichev.me> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260819160535.1472459-1-sdf@fomichev.me> References: <20260819160535.1472459-1-sdf@fomichev.me> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The zero-copy path reads TX metadata whenever the UMEM has metadata space, even if the descriptor does not set XDP_TX_METADATA. Pass descriptor options through the metadata helpers and ignore metadata unless the option is set. This does not fix the existing per-WQE metadata handling for mlx5 MPWQEs. Only the descriptor that starts a session passes through xsk_tx_metadata_request() and configures offload state shared by the batch. Metadata on descriptors joining an open session is therefore not validated and does not configure its requested offloads. In addition, a non-NULL metadata pointer from such a descriptor is treated as a timestamp completion request even when XDP_TXMD_FLAGS_TIMESTAMP is not set, so its metadata union can be overwritten with an unrequested timestamp. Fixing mixed metadata states within one MPWQE requires a separate change. Fixes: 48eb03dd2630 ("xsk: Add TX timestamp and TX checksum offload support") Reviewed-by: Alexander Lobakin Signed-off-by: Stanislav Fomichev --- drivers/net/ethernet/intel/igc/igc_main.c | 3 ++- .../ethernet/mellanox/mlx5/core/en/xsk/tx.c | 2 +- .../net/ethernet/stmicro/stmmac/stmmac_main.c | 3 ++- include/net/libeth/xsk.h | 2 +- include/net/xdp_sock_drv.h | 22 +++++++++++-------- include/net/xsk_buff_pool.h | 3 ++- net/xdp/xsk_buff_pool.c | 7 ++++-- 7 files changed, 26 insertions(+), 16 deletions(-) diff --git a/drivers/net/ethernet/intel/igc/igc_main.c b/drivers/net/ethernet/intel/igc/igc_main.c index 39043d8ca1bf..59067939a586 100644 --- a/drivers/net/ethernet/intel/igc/igc_main.c +++ b/drivers/net/ethernet/intel/igc/igc_main.c @@ -3074,7 +3074,8 @@ static void igc_xdp_xmit_zc(struct igc_ring *ring) olinfo_status = xdp_desc.len << IGC_ADVTXD_PAYLEN_SHIFT; dma = xsk_buff_raw_get_dma(pool, xdp_desc.addr); - meta = xsk_buff_get_metadata(pool, xdp_desc.addr); + meta = xsk_buff_get_metadata(pool, xdp_desc.addr, + xdp_desc.options); xsk_buff_raw_dma_sync_for_device(pool, dma, xdp_desc.len); bi = &ring->tx_buffer_info[ntu]; diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/tx.c b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/tx.c index 3d19dad8f868..d194eeddd7b5 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/tx.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en/xsk/tx.c @@ -99,7 +99,7 @@ bool mlx5e_xsk_tx(struct mlx5e_xdpsq *sq, unsigned int budget) xdptxd.dma_addr = xsk_buff_raw_get_dma(pool, desc.addr); xdptxd.data = xsk_buff_raw_get_data(pool, desc.addr); xdptxd.len = desc.len; - meta = xsk_buff_get_metadata(pool, desc.addr); + meta = xsk_buff_get_metadata(pool, desc.addr, desc.options); xsk_buff_raw_dma_sync_for_device(pool, xdptxd.dma_addr, xdptxd.len); diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index a71f0df26378..62de03e65a90 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -2719,7 +2719,8 @@ static bool stmmac_xdp_xmit_zc(struct stmmac_priv *priv, u32 queue, u32 budget) tx_desc = stmmac_get_tx_desc(priv, tx_q, entry); dma_addr = xsk_buff_raw_get_dma(pool, xdp_desc.addr); - meta = xsk_buff_get_metadata(pool, xdp_desc.addr); + meta = xsk_buff_get_metadata(pool, xdp_desc.addr, + xdp_desc.options); xsk_buff_raw_dma_sync_for_device(pool, dma_addr, xdp_desc.len); /* To return XDP buffer to XSK pool, we simple call diff --git a/include/net/libeth/xsk.h b/include/net/libeth/xsk.h index 5dcc0d7f65b7..a452b7828ce4 100644 --- a/include/net/libeth/xsk.h +++ b/include/net/libeth/xsk.h @@ -196,7 +196,7 @@ __libeth_xsk_xmit_fill_buf_md(const struct xdp_desc *xdesc, struct libeth_xdp_tx_desc desc; struct xdp_desc_ctx ctx; - ctx = xsk_buff_raw_get_ctx(sq->pool, xdesc->addr); + ctx = xsk_buff_raw_get_ctx(sq->pool, xdesc->addr, xdesc->options); desc = (typeof(desc)){ .addr = ctx.dma, __libeth_xdp_tx_len(xdesc->len), diff --git a/include/net/xdp_sock_drv.h b/include/net/xdp_sock_drv.h index b344789f5df8..d94aeb506379 100644 --- a/include/net/xdp_sock_drv.h +++ b/include/net/xdp_sock_drv.h @@ -240,6 +240,7 @@ static inline void *xsk_buff_raw_get_data(struct xsk_buff_pool *pool, u64 addr) * xsk_buff_raw_get_ctx - get &xdp_desc context * @pool: XSk buff pool desc address belongs to * @addr: desc address (from userspace) + * @options: desc options (from userspace) * * Wrapper for xp_raw_get_ctx() to be used in drivers, see its kdoc for * details. @@ -248,9 +249,9 @@ static inline void *xsk_buff_raw_get_data(struct xsk_buff_pool *pool, u64 addr) * pointer, if it is present (initialized to %NULL otherwise). */ static inline struct xdp_desc_ctx -xsk_buff_raw_get_ctx(const struct xsk_buff_pool *pool, u64 addr) +xsk_buff_raw_get_ctx(const struct xsk_buff_pool *pool, u64 addr, u32 options) { - return xp_raw_get_ctx(pool, addr); + return xp_raw_get_ctx(pool, addr, options); } #define XDP_TXMD_FLAGS_VALID ( \ @@ -318,18 +319,20 @@ xsk_tx_metadata_request(const struct xsk_buff_pool *pool, } static inline struct xsk_tx_metadata * -__xsk_buff_get_metadata(const struct xsk_buff_pool *pool, void *data) +__xsk_buff_get_metadata(const struct xsk_buff_pool *pool, void *data, + unsigned int options) { - if (!pool->tx_metadata_len) + if (!pool->tx_metadata_len || !(options & XDP_TX_METADATA)) return NULL; return data - pool->tx_metadata_len; } static inline struct xsk_tx_metadata * -xsk_buff_get_metadata(struct xsk_buff_pool *pool, u64 addr) +xsk_buff_get_metadata(struct xsk_buff_pool *pool, u64 addr, u32 options) { - return __xsk_buff_get_metadata(pool, xp_raw_get_data(pool, addr)); + return __xsk_buff_get_metadata(pool, xp_raw_get_data(pool, addr), + options); } static inline void xsk_buff_dma_sync_for_cpu(struct xdp_buff *xdp) @@ -510,7 +513,7 @@ static inline void *xsk_buff_raw_get_data(struct xsk_buff_pool *pool, u64 addr) } static inline struct xdp_desc_ctx -xsk_buff_raw_get_ctx(const struct xsk_buff_pool *pool, u64 addr) +xsk_buff_raw_get_ctx(const struct xsk_buff_pool *pool, u64 addr, u32 options) { return (struct xdp_desc_ctx){ }; } @@ -530,13 +533,14 @@ xsk_tx_metadata_request(const struct xsk_buff_pool *pool, } static inline struct xsk_tx_metadata * -__xsk_buff_get_metadata(const struct xsk_buff_pool *pool, void *data) +__xsk_buff_get_metadata(const struct xsk_buff_pool *pool, void *data, + unsigned int options) { return NULL; } static inline struct xsk_tx_metadata * -xsk_buff_get_metadata(struct xsk_buff_pool *pool, u64 addr) +xsk_buff_get_metadata(struct xsk_buff_pool *pool, u64 addr, u32 options) { return NULL; } diff --git a/include/net/xsk_buff_pool.h b/include/net/xsk_buff_pool.h index 2bb1d122b1bc..a7df573784fd 100644 --- a/include/net/xsk_buff_pool.h +++ b/include/net/xsk_buff_pool.h @@ -154,7 +154,8 @@ struct xdp_desc_ctx { struct xsk_tx_metadata *meta; }; -struct xdp_desc_ctx xp_raw_get_ctx(const struct xsk_buff_pool *pool, u64 addr); +struct xdp_desc_ctx xp_raw_get_ctx(const struct xsk_buff_pool *pool, u64 addr, + u32 options); static inline dma_addr_t xp_get_dma(struct xdp_buff_xsk *xskb) { diff --git a/net/xdp/xsk_buff_pool.c b/net/xdp/xsk_buff_pool.c index 78c14f106395..9d2d94f1fb75 100644 --- a/net/xdp/xsk_buff_pool.c +++ b/net/xdp/xsk_buff_pool.c @@ -763,6 +763,7 @@ EXPORT_SYMBOL(xp_raw_get_dma); * xp_raw_get_ctx - get &xdp_desc context * @pool: XSk buff pool desc address belongs to * @addr: desc address (from userspace) + * @options: desc options (from userspace) * * Helper for getting desc's DMA address and metadata pointer, if present. * Saves one call on hotpath and double calculation of the actual address. @@ -771,14 +772,16 @@ EXPORT_SYMBOL(xp_raw_get_dma); * Return: new &xdp_desc_ctx struct containing desc's DMA address and metadata * pointer, if it is present (initialized to %NULL otherwise). */ -struct xdp_desc_ctx xp_raw_get_ctx(const struct xsk_buff_pool *pool, u64 addr) +struct xdp_desc_ctx xp_raw_get_ctx(const struct xsk_buff_pool *pool, u64 addr, + u32 options) { struct xdp_desc_ctx ret; addr = __xp_raw_get_addr(pool, addr); ret.dma = __xp_raw_get_dma(pool, addr); - ret.meta = __xsk_buff_get_metadata(pool, __xp_raw_get_data(pool, addr)); + ret.meta = __xsk_buff_get_metadata(pool, __xp_raw_get_data(pool, addr), + options); return ret; } -- 2.53.0-Meta