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From: "Michael S. Tsirkin" <mst@redhat.com>
To: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>,
	Arnaud POULIQUEN <arnaud.pouliquen@st.com>,
	"linux-remoteproc@vger.kernel.org"
	<linux-remoteproc@vger.kernel.org>,
	Ohad Ben-Cohen <ohad@wizery.com>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>,
	Liam Girdwood <liam.r.girdwood@linux.intel.com>
Subject: Re: [PATCH RESEND v4] rpmsg: virtio: add endianness conversions
Date: Tue, 21 Jul 2020 06:04:12 -0400
Message-ID: <20200721060305-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <20200721085638.GA3815@ubuntu>

On Tue, Jul 21, 2020 at 10:56:38AM +0200, Guennadi Liakhovetski wrote:
> According to the VirtIO 1.0 spec data, sent over virtual queues must
> be in little-endian format. Update the RPMsg VirtIO implementation
> to enforce that but let legacy configurations continue use native
> endianness.
> 
> Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
> Reviewed-by: Mathieu Poirier <mathieu.poirier@linaro.org>
> Tested-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>

Looks good to me
Acked-by: Michael S. Tsirkin <mst@redhat.com>

Who's merging this? If me, could I get acks from maintainers on this please?


> ---
> 
> Ping: 2 weeks since the original submission. Also added back the updated
> "reviewed-by" tag.
> 
> v4: fix a left-over use of an LE value in calculation - thanks to Arnaud for
> catching!
> 
> v3: use the virtio_byteorder.h header
> 
> v2: Following suggestions from Michael and Mathieu switch to using virtio16/32
> types and conversion functions.
> 
>  drivers/rpmsg/virtio_rpmsg_bus.c | 63 +++++++++++++++++---------------
>  1 file changed, 34 insertions(+), 29 deletions(-)
> 
> diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c
> index 07d4f3374098..9006fc7f73d0 100644
> --- a/drivers/rpmsg/virtio_rpmsg_bus.c
> +++ b/drivers/rpmsg/virtio_rpmsg_bus.c
> @@ -23,6 +23,7 @@
>  #include <linux/slab.h>
>  #include <linux/sched.h>
>  #include <linux/virtio.h>
> +#include <linux/virtio_byteorder.h>
>  #include <linux/virtio_ids.h>
>  #include <linux/virtio_config.h>
>  #include <linux/wait.h>
> @@ -84,11 +85,11 @@ struct virtproc_info {
>   * Every message sent(/received) on the rpmsg bus begins with this header.
>   */
>  struct rpmsg_hdr {
> -	u32 src;
> -	u32 dst;
> -	u32 reserved;
> -	u16 len;
> -	u16 flags;
> +	__virtio32 src;
> +	__virtio32 dst;
> +	__virtio32 reserved;
> +	__virtio16 len;
> +	__virtio16 flags;
>  	u8 data[];
>  } __packed;
>  
> @@ -106,8 +107,8 @@ struct rpmsg_hdr {
>   */
>  struct rpmsg_ns_msg {
>  	char name[RPMSG_NAME_SIZE];
> -	u32 addr;
> -	u32 flags;
> +	__virtio32 addr;
> +	__virtio32 flags;
>  } __packed;
>  
>  /**
> @@ -335,8 +336,8 @@ static int virtio_rpmsg_announce_create(struct rpmsg_device *rpdev)
>  		struct rpmsg_ns_msg nsm;
>  
>  		strncpy(nsm.name, rpdev->id.name, RPMSG_NAME_SIZE);
> -		nsm.addr = rpdev->ept->addr;
> -		nsm.flags = RPMSG_NS_CREATE;
> +		nsm.addr = cpu_to_virtio32(vrp->vdev, rpdev->ept->addr);
> +		nsm.flags = cpu_to_virtio32(vrp->vdev, RPMSG_NS_CREATE);
>  
>  		err = rpmsg_sendto(rpdev->ept, &nsm, sizeof(nsm), RPMSG_NS_ADDR);
>  		if (err)
> @@ -359,8 +360,8 @@ static int virtio_rpmsg_announce_destroy(struct rpmsg_device *rpdev)
>  		struct rpmsg_ns_msg nsm;
>  
>  		strncpy(nsm.name, rpdev->id.name, RPMSG_NAME_SIZE);
> -		nsm.addr = rpdev->ept->addr;
> -		nsm.flags = RPMSG_NS_DESTROY;
> +		nsm.addr = cpu_to_virtio32(vrp->vdev, rpdev->ept->addr);
> +		nsm.flags = cpu_to_virtio32(vrp->vdev, RPMSG_NS_DESTROY);
>  
>  		err = rpmsg_sendto(rpdev->ept, &nsm, sizeof(nsm), RPMSG_NS_ADDR);
>  		if (err)
> @@ -612,18 +613,18 @@ static int rpmsg_send_offchannel_raw(struct rpmsg_device *rpdev,
>  		}
>  	}
>  
> -	msg->len = len;
> +	msg->len = cpu_to_virtio16(vrp->vdev, len);
>  	msg->flags = 0;
> -	msg->src = src;
> -	msg->dst = dst;
> +	msg->src = cpu_to_virtio32(vrp->vdev, src);
> +	msg->dst = cpu_to_virtio32(vrp->vdev, dst);
>  	msg->reserved = 0;
>  	memcpy(msg->data, data, len);
>  
>  	dev_dbg(dev, "TX From 0x%x, To 0x%x, Len %d, Flags %d, Reserved %d\n",
> -		msg->src, msg->dst, msg->len, msg->flags, msg->reserved);
> +		src, dst, len, msg->flags, msg->reserved);
>  #if defined(CONFIG_DYNAMIC_DEBUG)
>  	dynamic_hex_dump("rpmsg_virtio TX: ", DUMP_PREFIX_NONE, 16, 1,
> -			 msg, sizeof(*msg) + msg->len, true);
> +			 msg, sizeof(*msg) + len, true);
>  #endif
>  
>  	rpmsg_sg_init(&sg, msg, sizeof(*msg) + len);
> @@ -704,13 +705,17 @@ static int rpmsg_recv_single(struct virtproc_info *vrp, struct device *dev,
>  {
>  	struct rpmsg_endpoint *ept;
>  	struct scatterlist sg;
> +	unsigned int msg_len = virtio16_to_cpu(vrp->vdev, msg->len);
>  	int err;
>  
>  	dev_dbg(dev, "From: 0x%x, To: 0x%x, Len: %d, Flags: %d, Reserved: %d\n",
> -		msg->src, msg->dst, msg->len, msg->flags, msg->reserved);
> +		virtio32_to_cpu(vrp->vdev, msg->src),
> +		virtio32_to_cpu(vrp->vdev, msg->dst), msg_len,
> +		virtio16_to_cpu(vrp->vdev, msg->flags),
> +		virtio32_to_cpu(vrp->vdev, msg->reserved));
>  #if defined(CONFIG_DYNAMIC_DEBUG)
>  	dynamic_hex_dump("rpmsg_virtio RX: ", DUMP_PREFIX_NONE, 16, 1,
> -			 msg, sizeof(*msg) + msg->len, true);
> +			 msg, sizeof(*msg) + msg_len, true);
>  #endif
>  
>  	/*
> @@ -718,15 +723,15 @@ static int rpmsg_recv_single(struct virtproc_info *vrp, struct device *dev,
>  	 * the reported payload length.
>  	 */
>  	if (len > vrp->buf_size ||
> -	    msg->len > (len - sizeof(struct rpmsg_hdr))) {
> -		dev_warn(dev, "inbound msg too big: (%d, %d)\n", len, msg->len);
> +	    msg_len > (len - sizeof(struct rpmsg_hdr))) {
> +		dev_warn(dev, "inbound msg too big: (%d, %d)\n", len, msg_len);
>  		return -EINVAL;
>  	}
>  
>  	/* use the dst addr to fetch the callback of the appropriate user */
>  	mutex_lock(&vrp->endpoints_lock);
>  
> -	ept = idr_find(&vrp->endpoints, msg->dst);
> +	ept = idr_find(&vrp->endpoints, virtio32_to_cpu(vrp->vdev, msg->dst));
>  
>  	/* let's make sure no one deallocates ept while we use it */
>  	if (ept)
> @@ -739,8 +744,8 @@ static int rpmsg_recv_single(struct virtproc_info *vrp, struct device *dev,
>  		mutex_lock(&ept->cb_lock);
>  
>  		if (ept->cb)
> -			ept->cb(ept->rpdev, msg->data, msg->len, ept->priv,
> -				msg->src);
> +			ept->cb(ept->rpdev, msg->data, msg_len, ept->priv,
> +				virtio32_to_cpu(vrp->vdev, msg->src));
>  
>  		mutex_unlock(&ept->cb_lock);
>  
> @@ -846,15 +851,15 @@ static int rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len,
>  	/* don't trust the remote processor for null terminating the name */
>  	msg->name[RPMSG_NAME_SIZE - 1] = '\0';
>  
> -	dev_info(dev, "%sing channel %s addr 0x%x\n",
> -		 msg->flags & RPMSG_NS_DESTROY ? "destroy" : "creat",
> -		 msg->name, msg->addr);
> -
>  	strncpy(chinfo.name, msg->name, sizeof(chinfo.name));
>  	chinfo.src = RPMSG_ADDR_ANY;
> -	chinfo.dst = msg->addr;
> +	chinfo.dst = virtio32_to_cpu(vrp->vdev, msg->addr);
> +
> +	dev_info(dev, "%sing channel %s addr 0x%x\n",
> +		 virtio32_to_cpu(vrp->vdev, msg->flags) & RPMSG_NS_DESTROY ?
> +		 "destroy" : "creat", msg->name, chinfo.dst);
>  
> -	if (msg->flags & RPMSG_NS_DESTROY) {
> +	if (virtio32_to_cpu(vrp->vdev, msg->flags) & RPMSG_NS_DESTROY) {
>  		ret = rpmsg_unregister_device(&vrp->vdev->dev, &chinfo);
>  		if (ret)
>  			dev_err(dev, "rpmsg_destroy_channel failed: %d\n", ret);
> -- 
> 2.27.0


  reply index

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-08 12:39 [PATCH] " Guennadi Liakhovetski
2020-06-08 13:13 ` Michael S. Tsirkin
2020-06-15 20:47 ` Mathieu Poirier
2020-06-16  6:14   ` Guennadi Liakhovetski
2020-06-16  7:30     ` [PATCH v2] " Guennadi Liakhovetski
2020-06-30 17:50       ` Mathieu Poirier
2020-07-01 10:00         ` Michael S. Tsirkin
2020-07-06 12:47           ` Guennadi Liakhovetski
2020-07-06 12:56             ` Guennadi Liakhovetski
2020-07-06 13:38               ` [PATCH v3] " Guennadi Liakhovetski
2020-07-07 15:11                 ` Arnaud POULIQUEN
2020-07-07 15:34                   ` [PATCH v4] " Guennadi Liakhovetski
2020-07-07 15:38                     ` Mathieu Poirier
2020-07-10  6:20                       ` Guennadi Liakhovetski
2020-07-21  8:56                       ` [PATCH RESEND " Guennadi Liakhovetski
2020-07-21 10:04                         ` Michael S. Tsirkin [this message]
2020-07-22  3:39                         ` Bjorn Andersson
2020-07-22  4:00                         ` patchwork-bot+linux-remoteproc
2020-07-27 16:07                         ` Michael S. Tsirkin
2020-07-27 16:09                           ` Mathieu Poirier
2020-07-28  9:51                             ` Michael S. Tsirkin

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