From patchwork Thu Jun 15 23:27:51 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Long Li X-Patchwork-Id: 13281863 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 80EB8EB64DA for ; Thu, 15 Jun 2023 23:28:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231244AbjFOX2b (ORCPT ); Thu, 15 Jun 2023 19:28:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52028 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239978AbjFOX23 (ORCPT ); Thu, 15 Jun 2023 19:28:29 -0400 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id B26392D57; Thu, 15 Jun 2023 16:28:02 -0700 (PDT) Received: by linux.microsoft.com (Postfix, from userid 1004) id CFA5B20FEB80; Thu, 15 Jun 2023 16:28:01 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com CFA5B20FEB80 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxonhyperv.com; s=default; t=1686871681; bh=y5V7yYuG8e/yBxteubjXicX8w1FBL0ThXqAOOQJhXdo=; h=From:To:Cc:Subject:Date:From; b=stBKByQKzI7m1IOjy7UOte9NtqAsQw8X/9BlGGKRqWUrmNT1ZSKuLJ9p/BJg1bM+u V5C+XxZgkJCn/ZxEjfBMWsN+dQ0x2O4bL7+9G7KDE7LdBG5sXSuRcDD8jS0wxL3fMn KuuCL9G9EV8bUR4NuI65/AdC4J5fayC1KWKp90QU= From: longli@linuxonhyperv.com To: "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Leon Romanovsky , Shradha Gupta , Ajay Sharma , Shachar Raindel , Stephen Hemminger , linux-hyperv@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: linux-rdma@vger.kernel.org, Long Li , stable@vger.kernel.org Subject: [PATCH] net: mana: Batch ringing RX queue doorbell on receiving packets Date: Thu, 15 Jun 2023 16:27:51 -0700 Message-Id: <1686871671-31110-1-git-send-email-longli@linuxonhyperv.com> X-Mailer: git-send-email 1.8.3.1 Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: Long Li It's inefficient to ring the doorbell page every time a WQE is posted to the received queue. Move the code for ringing doorbell page to where after we have posted all WQEs to the receive queue during a callback from napi_poll(). Tests showed no regression in network latency benchmarks. Cc: stable@vger.kernel.org Fixes: ca9c54d2d6a5 ("net: mana: Add a driver for Microsoft Azure Network Adapter (MANA)") Signed-off-by: Long Li Reviewed-by: Haiyang Zhang --- drivers/net/ethernet/microsoft/mana/mana_en.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/microsoft/mana/mana_en.c b/drivers/net/ethernet/microsoft/mana/mana_en.c index cd4d5ceb9f2d..ef1f0ce8e44d 100644 --- a/drivers/net/ethernet/microsoft/mana/mana_en.c +++ b/drivers/net/ethernet/microsoft/mana/mana_en.c @@ -1383,8 +1383,8 @@ static void mana_post_pkt_rxq(struct mana_rxq *rxq) recv_buf_oob = &rxq->rx_oobs[curr_index]; - err = mana_gd_post_and_ring(rxq->gdma_rq, &recv_buf_oob->wqe_req, - &recv_buf_oob->wqe_inf); + err = mana_gd_post_work_request(rxq->gdma_rq, &recv_buf_oob->wqe_req, + &recv_buf_oob->wqe_inf); if (WARN_ON_ONCE(err)) return; @@ -1654,6 +1654,12 @@ static void mana_poll_rx_cq(struct mana_cq *cq) mana_process_rx_cqe(rxq, cq, &comp[i]); } + if (comp_read) { + struct gdma_context *gc = rxq->gdma_rq->gdma_dev->gdma_context; + + mana_gd_wq_ring_doorbell(gc, rxq->gdma_rq); + } + if (rxq->xdp_flush) xdp_do_flush(); }