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 [thread overview]
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
next prev parent reply other threads:[~2020-07-21 10:04 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-08 12:39 [PATCH] rpmsg: virtio: add endianness conversions 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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200721060305-mutt-send-email-mst@kernel.org \
--to=mst@redhat.com \
--cc=arnaud.pouliquen@st.com \
--cc=bjorn.andersson@linaro.org \
--cc=guennadi.liakhovetski@linux.intel.com \
--cc=liam.r.girdwood@linux.intel.com \
--cc=linux-remoteproc@vger.kernel.org \
--cc=mathieu.poirier@linaro.org \
--cc=ohad@wizery.com \
--cc=pierre-louis.bossart@linux.intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.