From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id A83B2386544; Tue, 7 Apr 2026 20:02:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775592173; cv=none; b=gpta3dOXm4xIpn1YEvWAOn8SRO9ELO9GqEN/AnpSoc8emAeEiFiYmU0SDQOCShjbC658/TUzei/2aRF16UBGMrpcTjMd+gS173pOC7DtPHMfVmrLshAdSKqb0T+ROlOpLusoJ1A6njQ9tnsWZmZbA+GbgjsXDf2yQ6ALDBkX7HY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1775592173; c=relaxed/simple; bh=zhrdLBOAX4sRu+JVy95cnajMlEwwGpbH+0F+hC6eKPY=; h=From:To:Subject:Date:Message-ID:MIME-Version; b=ejoudynkbBbCOJM2NbJQ2ozx3+jWlHlKLG9Vp/GmKOxJefIhuHRmLnYszWkL2kqPaa3nnoXRiJMI8pvB7mcbRMwFDRD3DMxRXFbE/bj/n2ICFum35ls8LeG+xbmphnOd0bUCjOO1PutYwIZqXdf7pwTDd6208YKfdSHtSpyItIk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=DYl6Js2j; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="DYl6Js2j" Received: from linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net (linux.microsoft.com [13.77.154.182]) by linux.microsoft.com (Postfix) with ESMTPSA id CDDDA20B710C; Tue, 7 Apr 2026 13:02:51 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com CDDDA20B710C DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1775592171; bh=+SIqMdJ/EcG7TUh69n7q64NlP0bCETk2c86sFy28uOU=; h=From:To:Subject:Date:From; b=DYl6Js2jEex5I+QD5RC9/EE1KSxA4uAeroWWTEYnQfOEGvu0IykmgbqM+Q/HZPgDA ZIk0HNHgISQaDZFt3UlcGCLpiS0djD32eiogxnqgIxjK3pf+ZaYZFKONrG04QcO563 vhVwko8Cz1Ys66fI2/z1EvSzL1VQzlcniIXIWxTo= From: Dipayaan Roy To: kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, leon@kernel.org, longli@microsoft.com, kotaranov@microsoft.com, horms@kernel.org, shradhagupta@linux.microsoft.com, ssengar@linux.microsoft.com, ernis@linux.microsoft.com, shirazsaleem@microsoft.com, linux-hyperv@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, stephen@networkplumber.org, jacob.e.keller@intel.com, leitao@debian.org, kees@kernel.org, john.fastabend@gmail.com, hawk@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, ast@kernel.org, sdf@fomichev.me, dipayanroy@microsoft.com Subject: [PATCH net-next v6 0/2] net: mana: add ethtool private flag for full-page RX buffers Date: Tue, 7 Apr 2026 12:59:17 -0700 Message-ID: <20260407200216.272659-1-dipayanroy@linux.microsoft.com> X-Mailer: git-send-email 2.43.7 Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit On some ARM64 platforms with 4K PAGE_SIZE, utilizing page_pool fragments for allocation in the RX refill path (~2kB buffer per fragment) causes 15-20% throughput regression under high connection counts (>16 TCP streams at 180+ Gbps). Using full-page buffers on these platforms shows no regression and restores line-rate performance. This behavior is observed on a single platform; other platforms perform better with page_pool fragments, indicating this is not a page_pool issue but platform-specific. This series adds an ethtool private flag "full-page-rx" to let the user opt in to one RX buffer per page: ethtool --set-priv-flags eth0 full-page-rx on There is no behavioral change by default. The flag can be persisted via udev rule for affected platforms. Changes in v6: - Added missed maintainers. Changes in v5: - Split prep refactor into separate patch (patch 1/2) Changes in v4: - Dropping the smbios string parsing and add ethtool priv flag to reconfigure the queues with full page rx buffers. Changes in v3: - changed u8* to char* Changes in v2: - separate reading string index and the string, remove inline. Dipayaan Roy (2): net: mana: refactor mana_get_strings() and mana_get_sset_count() to use switch net: mana: force full-page RX buffers via ethtool private flag drivers/net/ethernet/microsoft/mana/mana_en.c | 22 ++- .../ethernet/microsoft/mana/mana_ethtool.c | 164 ++++++++++++++---- include/net/mana/mana.h | 8 + 3 files changed, 163 insertions(+), 31 deletions(-) -- 2.43.0