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=-17.5 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 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 19C7EC433DB for ; Fri, 29 Jan 2021 03:51:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D020364E01 for ; Fri, 29 Jan 2021 03:51:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231919AbhA2Dve (ORCPT ); Thu, 28 Jan 2021 22:51:34 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:53460 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231878AbhA2DvV (ORCPT ); Thu, 28 Jan 2021 22:51:21 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1611892195; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=1wOMLsnl3srevdmRDL22qVzg7hZeq9Vx6iIhsGCDt5g=; b=RvRsDBAitIKccBq9TyYEweAYh4dDdyJOfNVMLE+71IE50StzOkbYIrho8fCOF/z6VAaQlC nH9iA+3vECwDjTuFti6AtWbeR1X0Cd0fCnT23TSL6VCMY4DD3ubtN0OzobKWdneP+T1iT4 QvsgmpiuT0VB0mT0QLixSSX2/7LsBOo= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-407-bVMfGUOKOKOQJgtd-AiNww-1; Thu, 28 Jan 2021 22:49:53 -0500 X-MC-Unique: bVMfGUOKOKOQJgtd-AiNww-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C0FEA107ACE3; Fri, 29 Jan 2021 03:49:51 +0000 (UTC) Received: from [10.72.14.10] (ovpn-14-10.pek2.redhat.com [10.72.14.10]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1E0221894E; Fri, 29 Jan 2021 03:49:46 +0000 (UTC) Subject: Re: [PATCH 2/2] vdpa/mlx5: Restore the hardware used index after change map To: Eli Cohen , mst@redhat.com Cc: virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, lulu@redhat.com References: <20210128134130.3051-1-elic@nvidia.com> <20210128134130.3051-3-elic@nvidia.com> From: Jason Wang Message-ID: <54239b51-918c-3475-dc88-4da1a4548da8@redhat.com> Date: Fri, 29 Jan 2021 11:49:45 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210128134130.3051-3-elic@nvidia.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org On 2021/1/28 下午9:41, Eli Cohen wrote: > When a change of memory map occurs, the hardware resources are destroyed > and then re-created again with the new memory map. In such case, we need > to restore the hardware available and used indices. The driver failed to > restore the used index which is added here. > > Fixes 1a86b377aa21 ("vdpa/mlx5: Add VDPA driver for supported mlx5 devices") > Signed-off-by: Eli Cohen A question. Does this mean after a vq is suspended, the hw used index is not equal to vq used index? Thanks > --- > drivers/vdpa/mlx5/net/mlx5_vnet.c | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/drivers/vdpa/mlx5/net/mlx5_vnet.c b/drivers/vdpa/mlx5/net/mlx5_vnet.c > index 549ded074ff3..3fc8588cecae 100644 > --- a/drivers/vdpa/mlx5/net/mlx5_vnet.c > +++ b/drivers/vdpa/mlx5/net/mlx5_vnet.c > @@ -87,6 +87,7 @@ struct mlx5_vq_restore_info { > u64 device_addr; > u64 driver_addr; > u16 avail_index; > + u16 used_index; > bool ready; > struct vdpa_callback cb; > bool restore; > @@ -121,6 +122,7 @@ struct mlx5_vdpa_virtqueue { > u32 virtq_id; > struct mlx5_vdpa_net *ndev; > u16 avail_idx; > + u16 used_idx; > int fw_state; > > /* keep last in the struct */ > @@ -804,6 +806,7 @@ static int create_virtqueue(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtque > > obj_context = MLX5_ADDR_OF(create_virtio_net_q_in, in, obj_context); > MLX5_SET(virtio_net_q_object, obj_context, hw_available_index, mvq->avail_idx); > + MLX5_SET(virtio_net_q_object, obj_context, hw_used_index, mvq->used_idx); > MLX5_SET(virtio_net_q_object, obj_context, queue_feature_bit_mask_12_3, > get_features_12_3(ndev->mvdev.actual_features)); > vq_ctx = MLX5_ADDR_OF(virtio_net_q_object, obj_context, virtio_q_context); > @@ -1022,6 +1025,7 @@ static int connect_qps(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue *m > struct mlx5_virtq_attr { > u8 state; > u16 available_index; > + u16 used_index; > }; > > static int query_virtqueue(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueue *mvq, > @@ -1052,6 +1056,7 @@ static int query_virtqueue(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqueu > memset(attr, 0, sizeof(*attr)); > attr->state = MLX5_GET(virtio_net_q_object, obj_context, state); > attr->available_index = MLX5_GET(virtio_net_q_object, obj_context, hw_available_index); > + attr->used_index = MLX5_GET(virtio_net_q_object, obj_context, hw_used_index); > kfree(out); > return 0; > > @@ -1602,6 +1607,7 @@ static int save_channel_info(struct mlx5_vdpa_net *ndev, struct mlx5_vdpa_virtqu > return err; > > ri->avail_index = attr.available_index; > + ri->used_index = attr.used_index; > ri->ready = mvq->ready; > ri->num_ent = mvq->num_ent; > ri->desc_addr = mvq->desc_addr; > @@ -1646,6 +1652,7 @@ static void restore_channels_info(struct mlx5_vdpa_net *ndev) > continue; > > mvq->avail_idx = ri->avail_index; > + mvq->used_idx = ri->used_index; > mvq->ready = ri->ready; > mvq->num_ent = ri->num_ent; > mvq->desc_addr = ri->desc_addr;