From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965690AbeCADTQ (ORCPT ); Wed, 28 Feb 2018 22:19:16 -0500 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:50936 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S965589AbeCADTP (ORCPT ); Wed, 28 Feb 2018 22:19:15 -0500 From: Jason Wang To: mst@redhat.com, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: brouer@redhat.com, john.fastabend@gmail.com, Jason Wang Subject: [PATCH net-next 0/2] virtio-net: re enable XDP_REDIRECT for mergeable buffer Date: Thu, 1 Mar 2018 11:19:03 +0800 Message-Id: <1519874345-10235-1-git-send-email-jasowang@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi: This series tries to re-enable XDP_REDIRECT for mergeable buffer which was removed since commit 7324f5399b06 ("virtio_net: disable XDP_REDIRECT in receive_mergeable() case"). Main concerns are: - not enough tailroom was reserved which breaks cpumap - complex logic like EWMA and linearizing during XDP processing Fix those by: - reserve enough tailroom during refill - disable EWMA and use fixed size of rx buffer - drop linearizing logic and offload it to generic XDP routine, this could happen only when the buffer were refilled before XDP set, so we could simply ignore the negative performance impact. Please review. Thanks Jason Wang (2): virtio-net: re enable XDP_REDIRECT for mergeable buffer virtio-net: simplify XDP handling in small buffer drivers/net/virtio_net.c | 186 ++++++++++++++++++----------------------------- 1 file changed, 70 insertions(+), 116 deletions(-) -- 2.7.4