From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A02923881A0; Mon, 5 May 2025 23:12:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746486736; cv=none; b=Ifl82uIknZeLdg/OWo1bdwSs4xLJUaBZhieUMYxnbGN/AxCGuDjDMtoqSGC7poliIRES8kMvZikttc1X3mWyW+PaL8J7pom/hSUeSWBEAgO2e81RYflh14Wwb6+EyT8FygbRkDasecjyBiOpIS/r7l32h8YW6aDz15TyOjU5AXA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746486736; c=relaxed/simple; bh=hiKBaxF6RN2nc1EUeWeuIkjft2VUiBmJi4Gmg5IKtJ8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=NpIL70BUfjr+bqzw45moZ5pa8Dy+amxDuvegMk37RTCIBNjvw/Bbsddt/BdkEzFMOZY5TKxELpdXRLrckN8uVlo/eL8avv68Or7jBrp/GbjFk4rkwXtFAJ9PBEWQU/n+WaGJ0ZlKH4CqnK4iTtFoyNbd0qpE8aBM2jFSV/wA9+Y= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=lU01cAuz; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="lU01cAuz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DC667C4CEE4; Mon, 5 May 2025 23:12:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1746486736; bh=hiKBaxF6RN2nc1EUeWeuIkjft2VUiBmJi4Gmg5IKtJ8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lU01cAuzDXFvZ8ewhHHPX9CYEJRHDI3B5zj3NtuMFav9VXTvipHWH32UPVMh8gb+F RzU1bZZQOnVT66yS0qPasCw8sOD0YXtbNEd9O9Olt/Mb5DAy61hD9Ym1KLpFn3dgw8 RiG0IgGy1qryu0Z/LVHMBy/z7HPQW1ho9kCaG2pMBXQ4ZDJUB+80dYUECgtd+j105X uRCLBYJvrj3Mq/w6Cz98LApkIzZ49qNOqaYmoZVqAhvZkYtu2JRwFzbmSwBicYO0Zg s/vGEQ3g7nVqlgT9yM+Jx290gWnPkbQKToL3Bz81OYtOfolThPGkKyLDZf5W9EoITL OdtGr9VlP6N2Q== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: William Tu , Bodong Wang , Saeed Mahameed , Tariq Toukan , Michal Swiatkowski , Jakub Kicinski , Sasha Levin , andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, netdev@vger.kernel.org, linux-rdma@vger.kernel.org Subject: [PATCH AUTOSEL 6.1 176/212] net/mlx5e: reduce rep rxq depth to 256 for ECPF Date: Mon, 5 May 2025 19:05:48 -0400 Message-Id: <20250505230624.2692522-176-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250505230624.2692522-1-sashal@kernel.org> References: <20250505230624.2692522-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.1.136 Content-Transfer-Encoding: 8bit From: William Tu [ Upstream commit b9cc8f9d700867aaa77aedddfea85e53d5e5d584 ] By experiments, a single queue representor netdev consumes kernel memory around 2.8MB, and 1.8MB out of the 2.8MB is due to page pool for the RXQ. Scaling to a thousand representors consumes 2.8GB, which becomes a memory pressure issue for embedded devices such as BlueField-2 16GB / BlueField-3 32GB memory. Since representor netdevs mostly handles miss traffic, and ideally, most of the traffic will be offloaded, reduce the default non-uplink rep netdev's RXQ default depth from 1024 to 256 if mdev is ecpf eswitch manager. This saves around 1MB of memory per regular RQ, (1024 - 256) * 2KB, allocated from page pool. With rxq depth of 256, the netlink page pool tool reports $./tools/net/ynl/cli.py --spec Documentation/netlink/specs/netdev.yaml \ --dump page-pool-get {'id': 277, 'ifindex': 9, 'inflight': 128, 'inflight-mem': 786432, 'napi-id': 775}] This is due to mtu 1500 + headroom consumes half pages, so 256 rxq entries consumes around 128 pages (thus create a page pool with size 128), shown above at inflight. Note that each netdev has multiple types of RQs, including Regular RQ, XSK, PTP, Drop, Trap RQ. Since non-uplink representor only supports regular rq, this patch only changes the regular RQ's default depth. Signed-off-by: William Tu Reviewed-by: Bodong Wang Reviewed-by: Saeed Mahameed Signed-off-by: Tariq Toukan Reviewed-by: Michal Swiatkowski Link: https://patch.msgid.link/20250209101716.112774-8-tariqt@nvidia.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/ethernet/mellanox/mlx5/core/en_rep.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c index 837524d1d2258..b4980245b50b2 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c +++ b/drivers/net/ethernet/mellanox/mlx5/core/en_rep.c @@ -61,6 +61,7 @@ #define MLX5E_REP_PARAMS_DEF_LOG_SQ_SIZE \ max(0x7, MLX5E_PARAMS_MINIMUM_LOG_SQ_SIZE) #define MLX5E_REP_PARAMS_DEF_NUM_CHANNELS 1 +#define MLX5E_REP_PARAMS_DEF_LOG_RQ_SIZE 0x8 static const char mlx5e_rep_driver_name[] = "mlx5e_rep"; @@ -705,6 +706,8 @@ static void mlx5e_build_rep_params(struct net_device *netdev) /* RQ */ mlx5e_build_rq_params(mdev, params); + if (!mlx5e_is_uplink_rep(priv) && mlx5_core_is_ecpf(mdev)) + params->log_rq_mtu_frames = MLX5E_REP_PARAMS_DEF_LOG_RQ_SIZE; /* CQ moderation params */ params->rx_dim_enabled = MLX5_CAP_GEN(mdev, cq_moderation); -- 2.39.5