From patchwork Mon Jul 17 19:35:39 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Long Li X-Patchwork-Id: 13316550 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 36190C001DF for ; Mon, 17 Jul 2023 19:36:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231594AbjGQTf4 (ORCPT ); Mon, 17 Jul 2023 15:35:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36620 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230056AbjGQTfz (ORCPT ); Mon, 17 Jul 2023 15:35:55 -0400 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id E435ABE; Mon, 17 Jul 2023 12:35:54 -0700 (PDT) Received: by linux.microsoft.com (Postfix, from userid 1004) id 74E7921C7A03; Mon, 17 Jul 2023 12:35:54 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 74E7921C7A03 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxonhyperv.com; s=default; t=1689622554; bh=XYVYgOirAsauRpIsvXixfB6J0evqIQh9opQ7LMpeBYg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OTGZ63aKpVdiObPnWxlrtfW3yuiycFmIC1TMO5NpnDGQWVNEYqaMuBnfdW0yxyWf/ d10Ag5aFp1R8bnomNulbwL9ag3CVAsyx6VuRhD1oDE4ILLKoauQp9RDn5AQ6AedqPy onH5hYPH7JDTMAQv2jf7Q+YevKdEUUFV6G3AQXhQ= 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 Subject: [PATCH net-next v5 2/2] net: mana: Use the correct WQE count for ringing RQ doorbell Date: Mon, 17 Jul 2023 12:35:39 -0700 Message-Id: <1689622539-5334-3-git-send-email-longli@linuxonhyperv.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1689622539-5334-1-git-send-email-longli@linuxonhyperv.com> References: <1689622539-5334-1-git-send-email-longli@linuxonhyperv.com> Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: Long Li The hardware specification specifies that WQE_COUNT should set to 0 for the Receive Queue. Although currently the hardware doesn't enforce the check, in the future releases it may check on this value. Fixes: ca9c54d2d6a5 ("net: mana: Add a driver for Microsoft Azure Network Adapter (MANA)") Reviewed-by: Haiyang Zhang Reviewed-by: Dexuan Cui Signed-off-by: Long Li --- Change log: v4: Split the original patch into two: one for batching doorbell, one for setting the correct wqe count v5: Drop Cc: stable and use net-next drivers/net/ethernet/microsoft/mana/gdma_main.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/microsoft/mana/gdma_main.c b/drivers/net/ethernet/microsoft/mana/gdma_main.c index 8f3f78b68592..3765d3389a9a 100644 --- a/drivers/net/ethernet/microsoft/mana/gdma_main.c +++ b/drivers/net/ethernet/microsoft/mana/gdma_main.c @@ -300,8 +300,11 @@ static void mana_gd_ring_doorbell(struct gdma_context *gc, u32 db_index, void mana_gd_wq_ring_doorbell(struct gdma_context *gc, struct gdma_queue *queue) { + /* Hardware Spec specifies that software client should set 0 for + * wqe_cnt for Receive Queues. This value is not used in Send Queues. + */ mana_gd_ring_doorbell(gc, queue->gdma_dev->doorbell, queue->type, - queue->id, queue->head * GDMA_WQE_BU_SIZE, 1); + queue->id, queue->head * GDMA_WQE_BU_SIZE, 0); } void mana_gd_ring_cq(struct gdma_queue *cq, u8 arm_bit)