From nobody Thu Oct 2 09:17:10 2025 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 617432C11DB for ; Fri, 19 Sep 2025 07:32:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758267141; cv=none; b=PHbEKyp6Rxj0cLbsTn2dsjNXQ96h2JTCQLSohzSPjPMqhILu+ai5x5YxkSRwtg+O9bLc1AdiyKFXUZNn9wvYkR1pqSrLsPTYBxEYTITnHuNzVbVzVz3TYbD9umfVRlPw1nuoOVVNcyeUthvsEgxtKR0LGkalw8+UH7CN0H64izE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758267141; c=relaxed/simple; bh=4t6ixKfADhlr9xzvfuDQl77U06Jc1JbbTyleI9sfI7U=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=uvTES3Tu1zJ5eF0zjMh9TKDXMKRUFbEylquLyTSihB6gHPZaP4CAUBD5/wzNT5MQA2cfL3hxqRJbi7Rruuk1Zwks7Vz/hMk0lHp58R9nmrQWvCYmbR23AI/tU4f3tEEq12Z8wsTgkptK1JJnZs0nq9rtyZsjUk7pYnIFGhsso9Q= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=DNWxEp5p; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="DNWxEp5p" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1758267138; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=vFIZuPKUpfLWKhMoVS+8GFV45HPQ85k5vLQT16WEDbY=; b=DNWxEp5pWTquR9M9Yf9hgsjnjKaONliNjgoA/nybsOVHgpkYRu23IgZSdlEMjTy+ZNRfkJ naHSNbkTPkeI6Nd0SQxi+v3KyBkksclJRL78PIIjZBzKS25JkH6T/wUiI4i5E+uf0Hr53/ TGFXjM4TIAoReBmgewmLAONpAx7lRHQ= Received: from mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-127-nsbn7sWgO7ydFh65dozYOg-1; Fri, 19 Sep 2025 03:32:14 -0400 X-MC-Unique: nsbn7sWgO7ydFh65dozYOg-1 X-Mimecast-MFC-AGG-ID: nsbn7sWgO7ydFh65dozYOg_1758267134 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id EE30119560A2; Fri, 19 Sep 2025 07:32:13 +0000 (UTC) Received: from localhost.localdomain (unknown [10.72.112.45]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id DE9D81956045; Fri, 19 Sep 2025 07:32:10 +0000 (UTC) From: Jason Wang To: mst@redhat.com, jasowang@redhat.com, xuanzhuo@linux.alibaba.com, eperezma@redhat.com, virtualization@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH V6 03/19] virtio_ring: unify logic of virtqueue_poll() and more_used() Date: Fri, 19 Sep 2025 15:31:38 +0800 Message-ID: <20250919073154.49278-4-jasowang@redhat.com> In-Reply-To: <20250919073154.49278-1-jasowang@redhat.com> References: <20250919073154.49278-1-jasowang@redhat.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 This patch unifies the logic of virtqueue_poll() and more_used() for better code reusing and ease the future in order implementation. Acked-by: Eugenio P=C3=A9rez Reviewed-by: Xuan Zhuo Signed-off-by: Jason Wang --- drivers/virtio/virtio_ring.c | 48 +++++++++++++++--------------------- 1 file changed, 20 insertions(+), 28 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index fed3962411a1..d8a07e0d9fa8 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -806,12 +806,18 @@ static void detach_buf_split(struct vring_virtqueue *= vq, unsigned int head, } } =20 -static bool more_used_split(const struct vring_virtqueue *vq) +static bool virtqueue_poll_split(const struct vring_virtqueue *vq, + unsigned int last_used_idx) { - return vq->last_used_idx !=3D virtio16_to_cpu(vq->vq.vdev, + return (u16)last_used_idx !=3D virtio16_to_cpu(vq->vq.vdev, vq->split.vring.used->idx); } =20 +static bool more_used_split(const struct vring_virtqueue *vq) +{ + return virtqueue_poll_split(vq, vq->last_used_idx); +} + static void *virtqueue_get_buf_ctx_split(struct virtqueue *_vq, unsigned int *len, void **ctx) @@ -919,13 +925,6 @@ static unsigned int virtqueue_enable_cb_prepare_split(= struct virtqueue *_vq) return last_used_idx; } =20 -static bool virtqueue_poll_split(struct vring_virtqueue *vq, - unsigned int last_used_idx) -{ - return (u16)last_used_idx !=3D virtio16_to_cpu(vq->vq.vdev, - vq->split.vring.used->idx); -} - static bool virtqueue_enable_cb_delayed_split(struct virtqueue *_vq) { struct vring_virtqueue *vq =3D to_vvq(_vq); @@ -1710,16 +1709,20 @@ static inline bool is_used_desc_packed(const struct= vring_virtqueue *vq, return avail =3D=3D used && used =3D=3D used_wrap_counter; } =20 -static bool more_used_packed(const struct vring_virtqueue *vq) +static bool virtqueue_poll_packed(const struct vring_virtqueue *vq, u16 of= f_wrap) { - u16 last_used; - u16 last_used_idx; - bool used_wrap_counter; + bool wrap_counter; + u16 used_idx; =20 - last_used_idx =3D READ_ONCE(vq->last_used_idx); - last_used =3D packed_last_used(last_used_idx); - used_wrap_counter =3D packed_used_wrap_counter(last_used_idx); - return is_used_desc_packed(vq, last_used, used_wrap_counter); + wrap_counter =3D off_wrap >> VRING_PACKED_EVENT_F_WRAP_CTR; + used_idx =3D off_wrap & ~(1 << VRING_PACKED_EVENT_F_WRAP_CTR); + + return is_used_desc_packed(vq, used_idx, wrap_counter); +} + +static bool more_used_packed(const struct vring_virtqueue *vq) +{ + return virtqueue_poll_packed(vq, READ_ONCE(vq->last_used_idx)); } =20 static void *virtqueue_get_buf_ctx_packed(struct virtqueue *_vq, @@ -1843,17 +1846,6 @@ static unsigned int virtqueue_enable_cb_prepare_pack= ed(struct virtqueue *_vq) return vq->last_used_idx; } =20 -static bool virtqueue_poll_packed(struct vring_virtqueue *vq, u16 off_wrap) -{ - bool wrap_counter; - u16 used_idx; - - wrap_counter =3D off_wrap >> VRING_PACKED_EVENT_F_WRAP_CTR; - used_idx =3D off_wrap & ~(1 << VRING_PACKED_EVENT_F_WRAP_CTR); - - return is_used_desc_packed(vq, used_idx, wrap_counter); -} - static bool virtqueue_enable_cb_delayed_packed(struct virtqueue *_vq) { struct vring_virtqueue *vq =3D to_vvq(_vq); --=20 2.31.1