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=-8.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, 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 64026C31E4B for ; Thu, 13 Jun 2019 16:35:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4339120449 for ; Thu, 13 Jun 2019 16:35:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392533AbfFMQfz (ORCPT ); Thu, 13 Jun 2019 12:35:55 -0400 Received: from mga01.intel.com ([192.55.52.88]:5947 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730702AbfFMHhz (ORCPT ); Thu, 13 Jun 2019 03:37:55 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 13 Jun 2019 00:37:54 -0700 X-ExtLoop1: 1 Received: from mkarlsso-mobl.ger.corp.intel.com (HELO VM.ger.corp.intel.com) ([10.103.211.41]) by orsmga004.jf.intel.com with ESMTP; 13 Jun 2019 00:37:49 -0700 From: Magnus Karlsson To: magnus.karlsson@intel.com, bjorn.topel@intel.com, ast@kernel.org, daniel@iogearbox.net, netdev@vger.kernel.org, brouer@redhat.com Cc: bpf@vger.kernel.org, bruce.richardson@intel.com, ciara.loftus@intel.com, jakub.kicinski@netronome.com, xiaolong.ye@intel.com, qi.z.zhang@intel.com, maximmi@mellanox.com, sridhar.samudrala@intel.com, kevin.laatz@intel.com, ilias.apalodimas@linaro.org, kiran.patil@intel.com, axboe@kernel.dk, maciej.fijalkowski@intel.com, maciejromanfijalkowski@gmail.com, intel-wired-lan@lists.osuosl.org Subject: [PATCH bpf-next 3/6] i40e: add support for AF_XDP need_wakup feature Date: Thu, 13 Jun 2019 09:37:27 +0200 Message-Id: <1560411450-29121-4-git-send-email-magnus.karlsson@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1560411450-29121-1-git-send-email-magnus.karlsson@intel.com> References: <1560411450-29121-1-git-send-email-magnus.karlsson@intel.com> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This patch adds support for the need_wakeup feature of AF_XDP. If the application has told the kernel that it might sleep using the new bind flag XDP_USE_NEED_WAKEUP, the driver will then set this flag if it has no more buffers on the NIC Rx ring and yield to the application. For Tx, it will set the flag if it has no outstanding Tx completion interrupts and return to the application. Signed-off-by: Magnus Karlsson --- drivers/net/ethernet/intel/i40e/i40e_xsk.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c index 32be3dd..1863974 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c +++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c @@ -625,6 +625,15 @@ int i40e_clean_rx_irq_zc(struct i40e_ring *rx_ring, int budget) i40e_finalize_xdp_rx(rx_ring, xdp_xmit); i40e_update_rx_stats(rx_ring, total_rx_bytes, total_rx_packets); + + if (xsk_umem_uses_might_sleep(rx_ring->xsk_umem)) { + if (failure || rx_ring->next_to_clean == rx_ring->next_to_use) + xsk_set_rx_need_wakeup(rx_ring->xsk_umem); + else + xsk_clear_rx_need_wakeup(rx_ring->xsk_umem); + + return (int)total_rx_packets; + } return failure ? budget : (int)total_rx_packets; } @@ -758,6 +767,13 @@ bool i40e_clean_xdp_tx_irq(struct i40e_vsi *vsi, out_xmit: xmit_done = i40e_xmit_zc(tx_ring, budget); + if (xsk_umem_uses_might_sleep(tx_ring->xsk_umem)) { + if (tx_ring->next_to_clean == tx_ring->next_to_use) + xsk_set_tx_need_wakeup(tx_ring->xsk_umem); + else + xsk_clear_tx_need_wakeup(tx_ring->xsk_umem); + } + return work_done && xmit_done; } -- 2.7.4