From mboxrd@z Thu Jan 1 00:00:00 1970 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=-8.6 required=3.0 tests=DATE_IN_PAST_06_12, 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 703F6C7618B for ; Wed, 24 Jul 2019 13:26:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 48760229FA for ; Wed, 24 Jul 2019 13:26:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727851AbfGXN0Q (ORCPT ); Wed, 24 Jul 2019 09:26:16 -0400 Received: from mga01.intel.com ([192.55.52.88]:14367 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726099AbfGXN0P (ORCPT ); Wed, 24 Jul 2019 09:26:15 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 24 Jul 2019 06:26:15 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,303,1559545200"; d="scan'208";a="369295056" Received: from silpixa00399838.ir.intel.com (HELO silpixa00399838.ger.corp.intel.com) ([10.237.223.140]) by fmsmga006.fm.intel.com with ESMTP; 24 Jul 2019 06:26:12 -0700 From: Kevin Laatz To: netdev@vger.kernel.org, ast@kernel.org, daniel@iogearbox.net, bjorn.topel@intel.com, magnus.karlsson@intel.com, jakub.kicinski@netronome.com, jonathan.lemon@gmail.com, saeedm@mellanox.com, maximmi@mellanox.com, stephen@networkplumber.org Cc: bruce.richardson@intel.com, ciara.loftus@intel.com, bpf@vger.kernel.org, intel-wired-lan@lists.osuosl.org, Kevin Laatz Subject: [PATCH bpf-next v3 01/11] i40e: simplify Rx buffer recycle Date: Wed, 24 Jul 2019 05:10:33 +0000 Message-Id: <20190724051043.14348-2-kevin.laatz@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190724051043.14348-1-kevin.laatz@intel.com> References: <20190716030637.5634-1-kevin.laatz@intel.com> <20190724051043.14348-1-kevin.laatz@intel.com> Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Currently, the dma, addr and handle are modified when we reuse Rx buffers in zero-copy mode. However, this is not required as the inputs to the function are copies, not the original values themselves. As we use the copies within the function, we can use the original 'old_bi' values directly without having to mask and add the headroom. Signed-off-by: Kevin Laatz --- drivers/net/ethernet/intel/i40e/i40e_xsk.c | 13 +++---------- 1 file changed, 3 insertions(+), 10 deletions(-) diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c index 32bad014d76c..dfa096db2244 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c +++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c @@ -420,8 +420,6 @@ static void i40e_reuse_rx_buffer_zc(struct i40e_ring *rx_ring, struct i40e_rx_buffer *old_bi) { struct i40e_rx_buffer *new_bi = &rx_ring->rx_bi[rx_ring->next_to_alloc]; - unsigned long mask = (unsigned long)rx_ring->xsk_umem->chunk_mask; - u64 hr = rx_ring->xsk_umem->headroom + XDP_PACKET_HEADROOM; u16 nta = rx_ring->next_to_alloc; /* update, and store next to alloc */ @@ -429,14 +427,9 @@ static void i40e_reuse_rx_buffer_zc(struct i40e_ring *rx_ring, rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0; /* transfer page from old buffer to new buffer */ - new_bi->dma = old_bi->dma & mask; - new_bi->dma += hr; - - new_bi->addr = (void *)((unsigned long)old_bi->addr & mask); - new_bi->addr += hr; - - new_bi->handle = old_bi->handle & mask; - new_bi->handle += rx_ring->xsk_umem->headroom; + new_bi->dma = old_bi->dma; + new_bi->addr = old_bi->addr; + new_bi->handle = old_bi->handle; old_bi->addr = NULL; } -- 2.17.1 From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kevin Laatz Date: Wed, 24 Jul 2019 05:10:33 +0000 Subject: [Intel-wired-lan] [PATCH bpf-next v3 01/11] i40e: simplify Rx buffer recycle In-Reply-To: <20190724051043.14348-1-kevin.laatz@intel.com> References: <20190716030637.5634-1-kevin.laatz@intel.com> <20190724051043.14348-1-kevin.laatz@intel.com> Message-ID: <20190724051043.14348-2-kevin.laatz@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: intel-wired-lan@osuosl.org List-ID: Currently, the dma, addr and handle are modified when we reuse Rx buffers in zero-copy mode. However, this is not required as the inputs to the function are copies, not the original values themselves. As we use the copies within the function, we can use the original 'old_bi' values directly without having to mask and add the headroom. Signed-off-by: Kevin Laatz --- drivers/net/ethernet/intel/i40e/i40e_xsk.c | 13 +++---------- 1 file changed, 3 insertions(+), 10 deletions(-) diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c index 32bad014d76c..dfa096db2244 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c +++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c @@ -420,8 +420,6 @@ static void i40e_reuse_rx_buffer_zc(struct i40e_ring *rx_ring, struct i40e_rx_buffer *old_bi) { struct i40e_rx_buffer *new_bi = &rx_ring->rx_bi[rx_ring->next_to_alloc]; - unsigned long mask = (unsigned long)rx_ring->xsk_umem->chunk_mask; - u64 hr = rx_ring->xsk_umem->headroom + XDP_PACKET_HEADROOM; u16 nta = rx_ring->next_to_alloc; /* update, and store next to alloc */ @@ -429,14 +427,9 @@ static void i40e_reuse_rx_buffer_zc(struct i40e_ring *rx_ring, rx_ring->next_to_alloc = (nta < rx_ring->count) ? nta : 0; /* transfer page from old buffer to new buffer */ - new_bi->dma = old_bi->dma & mask; - new_bi->dma += hr; - - new_bi->addr = (void *)((unsigned long)old_bi->addr & mask); - new_bi->addr += hr; - - new_bi->handle = old_bi->handle & mask; - new_bi->handle += rx_ring->xsk_umem->headroom; + new_bi->dma = old_bi->dma; + new_bi->addr = old_bi->addr; + new_bi->handle = old_bi->handle; old_bi->addr = NULL; } -- 2.17.1