From mboxrd@z Thu Jan 1 00:00:00 1970 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 197662F9DBA for ; Thu, 25 Sep 2025 10:37:36 +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=1758796658; cv=none; b=FnT80AiOLZHQJYF4fgQNxvkCh3silKjXMzc1KER5gNXPMiM/NS0pmSg09ZBP0pRMDWPjWqJXsNZd3ELagW4ktk9ExXxNK3uVTHwXFIo3UlBsN/bNPyexpNHT+oMb9jovVAy3g2gwFt5fVn+I+RMheDrS/Rmn1qknvXEfgV113Dg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758796658; c=relaxed/simple; bh=4t6ixKfADhlr9xzvfuDQl77U06Jc1JbbTyleI9sfI7U=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=mFvRxoK0aRExoh+tYktTHXLAvh24XK/OQfRjAl0zWaG7eskgb6SQFZYfV7hM2KnDaLbJr/85dfvHttHLXISePN7q5pIpNzc+izCrPBqqn2aQrfHsfeKiDe2eTy/QIcTGd3noZoX8h0c95ejQDjATjXH9rP8zQwJAOVVzdtLzuiw= 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=UcbG82qG; 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="UcbG82qG" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1758796656; 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=vFIZuPKUpfLWKhMoVS+8GFV45HPQ85k5vLQT16WEDbY=; b=UcbG82qGyVtUxhfFw0mwa8Bz+IvV1Txkh0LbyDgIHQBec/CspqjcXk3Yv3oHNeNMOHcH+w 8jnt1aE+Zx8MNCPjSlNDWxtBvjOUtapyM7QrdiabikD5kyNujEe9CwCmDN5vneczRidp2b As6XpKk/NQcCyT694SN7trqjddPO4X8= Received: from mx-prod-mc-03.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-153-m4C23J8MOSW-9cfZMFh5-A-1; Thu, 25 Sep 2025 06:37:32 -0400 X-MC-Unique: m4C23J8MOSW-9cfZMFh5-A-1 X-Mimecast-MFC-AGG-ID: m4C23J8MOSW-9cfZMFh5-A_1758796652 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-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id E17BD1944EBF; Thu, 25 Sep 2025 10:37:31 +0000 (UTC) Received: from localhost.localdomain (unknown [10.72.112.10]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 8907219560A2; Thu, 25 Sep 2025 10:37:28 +0000 (UTC) From: Jason Wang To: mst@redhat.com, jasowang@redhat.com, xuanzhuo@linux.alibaba.com, eperezma@redhat.com Cc: virtualization@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH V7 03/19] virtio_ring: unify logic of virtqueue_poll() and more_used() Date: Thu, 25 Sep 2025 18:36:52 +0800 Message-ID: <20250925103708.44589-4-jasowang@redhat.com> In-Reply-To: <20250925103708.44589-1-jasowang@redhat.com> References: <20250925103708.44589-1-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: 8bit 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 Pérez 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, } } -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 != virtio16_to_cpu(vq->vq.vdev, + return (u16)last_used_idx != virtio16_to_cpu(vq->vq.vdev, vq->split.vring.used->idx); } +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; } -static bool virtqueue_poll_split(struct vring_virtqueue *vq, - unsigned int last_used_idx) -{ - return (u16)last_used_idx != 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 = to_vvq(_vq); @@ -1710,16 +1709,20 @@ static inline bool is_used_desc_packed(const struct vring_virtqueue *vq, return avail == used && used == used_wrap_counter; } -static bool more_used_packed(const struct vring_virtqueue *vq) +static bool virtqueue_poll_packed(const struct vring_virtqueue *vq, u16 off_wrap) { - u16 last_used; - u16 last_used_idx; - bool used_wrap_counter; + bool wrap_counter; + u16 used_idx; - last_used_idx = READ_ONCE(vq->last_used_idx); - last_used = packed_last_used(last_used_idx); - used_wrap_counter = packed_used_wrap_counter(last_used_idx); - return is_used_desc_packed(vq, last_used, used_wrap_counter); + wrap_counter = off_wrap >> VRING_PACKED_EVENT_F_WRAP_CTR; + used_idx = 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)); } static void *virtqueue_get_buf_ctx_packed(struct virtqueue *_vq, @@ -1843,17 +1846,6 @@ static unsigned int virtqueue_enable_cb_prepare_packed(struct virtqueue *_vq) return vq->last_used_idx; } -static bool virtqueue_poll_packed(struct vring_virtqueue *vq, u16 off_wrap) -{ - bool wrap_counter; - u16 used_idx; - - wrap_counter = off_wrap >> VRING_PACKED_EVENT_F_WRAP_CTR; - used_idx = 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 = to_vvq(_vq); -- 2.31.1