From patchwork Wed Feb 15 12:42:59 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tirthendu Sarkar X-Patchwork-Id: 13141612 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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 90847C636CC for ; Wed, 15 Feb 2023 12:57:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233287AbjBOM54 (ORCPT ); Wed, 15 Feb 2023 07:57:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42576 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233852AbjBOM5w (ORCPT ); Wed, 15 Feb 2023 07:57:52 -0500 Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2362861B1; Wed, 15 Feb 2023 04:57:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1676465871; x=1708001871; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=9TYGTju5wJ26T7VHIbNLTsOJgKK+6HVcw3Qa/CXWZys=; b=kn5kIzMKPMpTgW2wR4QxVh1UJyO7GjsTeKkUWDptlcnyRkjEFA7DGIr4 oyehSqbpbURRuDLBVD06UpEi6BXn5I36fK+CxB+LBhKH7b/HDsBNmfjfL Dp7FMso4K/GaoHhoCucfhxAiBOIMP76PX/KXTE67FuzXj7kXVdq5IHYCw qFYNCFRyctl2O6+pq46ei2HRnBcyRf+NyksdTLgbWf9smNs6cUU/swkyS H3LguKf9S3Jrwgjih77BQVHgPKDfF4RugY8yOwyZzIzE+vGisGUi62IBg 0dLMrNb1JRsNvqFUIa9skb0+CSAhCpvlGVy/ZFGu0rLyV+LJcbyXt24bH g==; X-IronPort-AV: E=McAfee;i="6500,9779,10621"; a="393822011" X-IronPort-AV: E=Sophos;i="5.97,299,1669104000"; d="scan'208";a="393822011" Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Feb 2023 04:57:50 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10621"; a="998478603" X-IronPort-AV: E=Sophos;i="5.97,299,1669104000"; d="scan'208";a="998478603" Received: from unknown (HELO paamrpdk12-S2600BPB.aw.intel.com) ([10.228.151.145]) by fmsmga005-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Feb 2023 04:57:49 -0800 From: Tirthendu Sarkar To: intel-wired-lan@lists.osuosl.org Cc: jesse.brandeburg@intel.com, anthony.l.nguyen@intel.com, netdev@vger.kernel.org, bpf@vger.kernel.org, magnus.karlsson@intel.com, maciej.fijalkowski@intel.com, tirthendu.sarkar@intel.com Subject: [PATCH intel-next v4 2/8] i40e: change Rx buffer size for legacy-rx to support XDP multi-buffer Date: Wed, 15 Feb 2023 18:12:59 +0530 Message-Id: <20230215124305.76075-3-tirthendu.sarkar@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230215124305.76075-1-tirthendu.sarkar@intel.com> References: <20230215124305.76075-1-tirthendu.sarkar@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org X-Patchwork-Delegate: kuba@kernel.org Adding support for XDP multi-buffer entails adding information of all the fragments of the packet in the xdp_buff. This approach implies that underlying buffer has to provide tailroom for skb_shared_info. In the legacy-rx mode, driver can only configure upto 2k sized Rx buffers and with the current configuration of 2k sized Rx buffers there is no way to do tailroom reservation for skb_shared_info. Hence size of Rx buffers is now lowered to 1664 (2k - sizeof(skb_shared_info)). Also, driver can only chain upto 5 Rx buffers and this means max MTU supported for legacy-rx is now 8320. Signed-off-by: Tirthendu Sarkar --- drivers/net/ethernet/intel/i40e/i40e_main.c | 2 +- drivers/net/ethernet/intel/i40e/i40e_txrx.h | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c index 672038801d1d..d7c08f1d486a 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_main.c +++ b/drivers/net/ethernet/intel/i40e/i40e_main.c @@ -2903,7 +2903,7 @@ static void i40e_sync_filters_subtask(struct i40e_pf *pf) static u16 i40e_calculate_vsi_rx_buf_len(struct i40e_vsi *vsi) { if (!vsi->netdev || (vsi->back->flags & I40E_FLAG_LEGACY_RX)) - return I40E_RXBUFFER_2048; + return I40E_RXBUFFER_1664; return PAGE_SIZE < 8192 ? I40E_RXBUFFER_3072 : I40E_RXBUFFER_2048; } diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.h b/drivers/net/ethernet/intel/i40e/i40e_txrx.h index 768290dc6f48..1382efb43ffd 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.h +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.h @@ -97,6 +97,7 @@ enum i40e_dyn_idx_t { /* Supported Rx Buffer Sizes (a multiple of 128) */ #define I40E_RXBUFFER_256 256 #define I40E_RXBUFFER_1536 1536 /* 128B aligned standard Ethernet frame */ +#define I40E_RXBUFFER_1664 1664 /* For legacy Rx with tailroom for frags */ #define I40E_RXBUFFER_2048 2048 #define I40E_RXBUFFER_3072 3072 /* Used for large frames w/ padding */ #define I40E_MAX_RXBUFFER 9728 /* largest size for single descriptor */