From patchwork Tue Nov 3 19:47:30 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Saeed Mahameed X-Patchwork-Id: 11878949 X-Patchwork-Delegate: kuba@kernel.org Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0B595C388F7 for ; Tue, 3 Nov 2020 19:48:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B100D216C4 for ; Tue, 3 Nov 2020 19:48:09 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="G7xht6sT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729735AbgKCTsJ (ORCPT ); Tue, 3 Nov 2020 14:48:09 -0500 Received: from hqnvemgate24.nvidia.com ([216.228.121.143]:9519 "EHLO hqnvemgate24.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729723AbgKCTsF (ORCPT ); Tue, 3 Nov 2020 14:48:05 -0500 Received: from hqmail.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate24.nvidia.com (using TLS: TLSv1.2, AES256-SHA) id ; Tue, 03 Nov 2020 11:48:08 -0800 Received: from sx1.mtl.com (10.124.1.5) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Tue, 3 Nov 2020 19:48:03 +0000 From: Saeed Mahameed To: Jakub Kicinski CC: , "David S. Miller" , "Yevgeny Kliteynik" , Erez Shitrit , Mark Bloch , Saeed Mahameed Subject: [net-next 04/12] net/mlx5: DR, Add buddy allocator utilities Date: Tue, 3 Nov 2020 11:47:30 -0800 Message-ID: <20201103194738.64061-5-saeedm@nvidia.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201103194738.64061-1-saeedm@nvidia.com> References: <20201103194738.64061-1-saeedm@nvidia.com> MIME-Version: 1.0 X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL105.nvidia.com (172.20.187.12) To HQMAIL107.nvidia.com (172.20.187.13) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1604432888; bh=KlqdsbI/oCX9bvKwmmS4+CRhJ5NZg4+fbnJFBSXnB6g=; h=From:To:CC:Subject:Date:Message-ID:X-Mailer:In-Reply-To: References:MIME-Version:Content-Transfer-Encoding:Content-Type: X-Originating-IP:X-ClientProxiedBy; b=G7xht6sTvxcnc8r4WU0cvC8Zk/uzRmzRVgl1FUI0cJxfSIp1UGFnFEWIT5Leak/VT H6Cw+DPPJutnLYj6rL6yKcoVZN82VRLxjN0aSagTf+hYwn/K/zJ6qHXrt4eBReFJq9 dsOTlBknxE1mnoy+BRnDhZKc0h17JC1okPRAAW91mdzZG1kHGLtUJaqHeglGKd3NeB AKH1XH+s8Qs2VFybrrOUC8+t2uBYkEPKQ/eAvWTfe8fWhJuIgD3s0mSH8T8rZe88K9 8LJ66GLrenloS89+OhgMXSB7JstN1knaRaiTzQnRMWIaFC3oWow0jt3eb/ON85SoYS EKuOmpakK3tOQ== Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org From: Yevgeny Kliteynik Add implementation of SW Steering variation of buddy allocator. The buddy system for ICM memory uses 2 main data structures: - Bitmap per order, that keeps the current state of allocated blocks for this order - Indicator for the number of available blocks per each order Signed-off-by: Erez Shitrit Signed-off-by: Yevgeny Kliteynik Reviewed-by: Mark Bloch Signed-off-by: Saeed Mahameed --- .../net/ethernet/mellanox/mlx5/core/Makefile | 2 +- .../mellanox/mlx5/core/steering/dr_buddy.c | 170 ++++++++++++++++++ .../mellanox/mlx5/core/steering/mlx5dr.h | 33 ++++ 3 files changed, 204 insertions(+), 1 deletion(-) create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/steering/dr_buddy.c diff --git a/drivers/net/ethernet/mellanox/mlx5/core/Makefile b/drivers/net/ethernet/mellanox/mlx5/core/Makefile index 2d477f9a8cb7..83a67ca43a41 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/Makefile +++ b/drivers/net/ethernet/mellanox/mlx5/core/Makefile @@ -81,7 +81,7 @@ mlx5_core-$(CONFIG_MLX5_EN_TLS) += en_accel/tls.o en_accel/tls_rxtx.o en_accel/t mlx5_core-$(CONFIG_MLX5_SW_STEERING) += steering/dr_domain.o steering/dr_table.o \ steering/dr_matcher.o steering/dr_rule.o \ - steering/dr_icm_pool.o \ + steering/dr_icm_pool.o steering/dr_buddy.o \ steering/dr_ste.o steering/dr_send.o \ steering/dr_cmd.o steering/dr_fw.o \ steering/dr_action.o steering/fs_dr.o diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_buddy.c b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_buddy.c new file mode 100644 index 000000000000..7df11a019df9 --- /dev/null +++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/dr_buddy.c @@ -0,0 +1,170 @@ +// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB +/* Copyright (c) 2004 Topspin Communications. All rights reserved. + * Copyright (c) 2005 - 2008 Mellanox Technologies. All rights reserved. + * Copyright (c) 2006 - 2007 Cisco Systems, Inc. All rights reserved. + * Copyright (c) 2020 NVIDIA CORPORATION. All rights reserved. + */ + +#include "dr_types.h" + +int mlx5dr_buddy_init(struct mlx5dr_icm_buddy_mem *buddy, + unsigned int max_order) +{ + int i; + + buddy->max_order = max_order; + + INIT_LIST_HEAD(&buddy->list_node); + INIT_LIST_HEAD(&buddy->used_list); + INIT_LIST_HEAD(&buddy->hot_list); + + buddy->bitmap = kcalloc(buddy->max_order + 1, + sizeof(*buddy->bitmap), + GFP_KERNEL); + buddy->num_free = kcalloc(buddy->max_order + 1, + sizeof(*buddy->num_free), + GFP_KERNEL); + + if (!buddy->bitmap || !buddy->num_free) + goto err_free_all; + + /* Allocating max_order bitmaps, one for each order */ + + for (i = 0; i <= buddy->max_order; ++i) { + unsigned int size = 1 << (buddy->max_order - i); + + buddy->bitmap[i] = bitmap_zalloc(size, GFP_KERNEL); + if (!buddy->bitmap[i]) + goto err_out_free_each_bit_per_order; + } + + /* In the beginning, we have only one order that is available for + * use (the biggest one), so mark the first bit in both bitmaps. + */ + + bitmap_set(buddy->bitmap[buddy->max_order], 0, 1); + + buddy->num_free[buddy->max_order] = 1; + + return 0; + +err_out_free_each_bit_per_order: + for (i = 0; i <= buddy->max_order; ++i) + bitmap_free(buddy->bitmap[i]); + +err_free_all: + kfree(buddy->num_free); + kfree(buddy->bitmap); + return -ENOMEM; +} + +void mlx5dr_buddy_cleanup(struct mlx5dr_icm_buddy_mem *buddy) +{ + int i; + + list_del(&buddy->list_node); + + for (i = 0; i <= buddy->max_order; ++i) + bitmap_free(buddy->bitmap[i]); + + kfree(buddy->num_free); + kfree(buddy->bitmap); +} + +static int dr_buddy_find_free_seg(struct mlx5dr_icm_buddy_mem *buddy, + unsigned int start_order, + unsigned int *segment, + unsigned int *order) +{ + unsigned int seg, order_iter, m; + + for (order_iter = start_order; + order_iter <= buddy->max_order; ++order_iter) { + if (!buddy->num_free[order_iter]) + continue; + + m = 1 << (buddy->max_order - order_iter); + seg = find_first_bit(buddy->bitmap[order_iter], m); + + if (WARN(seg >= m, + "ICM Buddy: failed finding free mem for order %d\n", + order_iter)) + return -ENOMEM; + + break; + } + + if (order_iter > buddy->max_order) + return -ENOMEM; + + *segment = seg; + *order = order_iter; + return 0; +} + +/** + * mlx5dr_buddy_alloc_mem() - Update second level bitmap. + * @buddy: Buddy to update. + * @order: Order of the buddy to update. + * @segment: Segment number. + * + * This function finds the first area of the ICM memory managed by this buddy. + * It uses the data structures of the buddy system in order to find the first + * area of free place, starting from the current order till the maximum order + * in the system. + * + * Return: 0 when segment is set, non-zero error status otherwise. + * + * The function returns the location (segment) in the whole buddy ICM memory + * area - the index of the memory segment that is available for use. + */ +int mlx5dr_buddy_alloc_mem(struct mlx5dr_icm_buddy_mem *buddy, + unsigned int order, + unsigned int *segment) +{ + unsigned int seg, order_iter; + int err; + + err = dr_buddy_find_free_seg(buddy, order, &seg, &order_iter); + if (err) + return err; + + bitmap_clear(buddy->bitmap[order_iter], seg, 1); + --buddy->num_free[order_iter]; + + /* If we found free memory in some order that is bigger than the + * required order, we need to split every order between the required + * order and the order that we found into two parts, and mark accordingly. + */ + while (order_iter > order) { + --order_iter; + seg <<= 1; + bitmap_set(buddy->bitmap[order_iter], seg ^ 1, 1); + ++buddy->num_free[order_iter]; + } + + seg <<= order; + *segment = seg; + + return 0; +} + +void mlx5dr_buddy_free_mem(struct mlx5dr_icm_buddy_mem *buddy, + unsigned int seg, unsigned int order) +{ + seg >>= order; + + /* Whenever a segment is free, + * the mem is added to the buddy that gave it. + */ + while (test_bit(seg ^ 1, buddy->bitmap[order])) { + bitmap_clear(buddy->bitmap[order], seg ^ 1, 1); + --buddy->num_free[order]; + seg >>= 1; + ++order; + } + bitmap_set(buddy->bitmap[order], seg, 1); + + ++buddy->num_free[order]; +} + diff --git a/drivers/net/ethernet/mellanox/mlx5/core/steering/mlx5dr.h b/drivers/net/ethernet/mellanox/mlx5/core/steering/mlx5dr.h index 7914fe3fc68d..25b7bda3ce4a 100644 --- a/drivers/net/ethernet/mellanox/mlx5/core/steering/mlx5dr.h +++ b/drivers/net/ethernet/mellanox/mlx5/core/steering/mlx5dr.h @@ -127,4 +127,37 @@ mlx5dr_is_supported(struct mlx5_core_dev *dev) return MLX5_CAP_ESW_FLOWTABLE_FDB(dev, sw_owner); } +/* buddy functions & structure */ + +struct mlx5dr_icm_mr; + +struct mlx5dr_icm_buddy_mem { + unsigned long **bitmap; + unsigned int *num_free; + u32 max_order; + struct list_head list_node; + struct mlx5dr_icm_mr *icm_mr; + struct mlx5dr_icm_pool *pool; + + /* This is the list of used chunks. HW may be accessing this memory */ + struct list_head used_list; + + /* Hardware may be accessing this memory but at some future, + * undetermined time, it might cease to do so. + * sync_ste command sets them free. + */ + struct list_head hot_list; + /* indicates the byte size of hot mem */ + unsigned int hot_memory_size; +}; + +int mlx5dr_buddy_init(struct mlx5dr_icm_buddy_mem *buddy, + unsigned int max_order); +void mlx5dr_buddy_cleanup(struct mlx5dr_icm_buddy_mem *buddy); +int mlx5dr_buddy_alloc_mem(struct mlx5dr_icm_buddy_mem *buddy, + unsigned int order, + unsigned int *segment); +void mlx5dr_buddy_free_mem(struct mlx5dr_icm_buddy_mem *buddy, + unsigned int seg, unsigned int order); + #endif /* _MLX5DR_H_ */