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Message-ID: <1703727396.2909393-2-xuanzhuo@linux.alibaba.com>
Date: Thu, 28 Dec 2023 09:36:36 +0800
From: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: netdev@...r.kernel.org,
 Jason Wang <jasowang@...hat.com>,
 "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>,
 virtualization@...ts.linux.dev,
 Zhu Yanjun <yanjun.zhu@...ux.dev>
Subject: Re: [PATCH net-next v1 3/6] virtio_net: support device stats

On Wed, 27 Dec 2023 16:08:47 -0500, "Michael S. Tsirkin" <mst@...hat.com> wrote:
> On Tue, Dec 26, 2023 at 03:31:00PM +0800, Xuan Zhuo wrote:
> > As the spec https://github.com/oasis-tcs/virtio-spec/commit/42f389989823039724f95bbbd243291ab0064f82
> >
> > Virtio-net supports to get the stats from the device by ethtool -S <eth0>.
>
> you mean "make Virtio-net support getting..."

Not native speaker, thanks, I will fix in next version.


>
> > Signed-off-by: Xuan Zhuo <xuanzhuo@...ux.alibaba.com>
> > ---
> >  drivers/net/virtio_net.c | 354 ++++++++++++++++++++++++++++++++++++++-
> >  1 file changed, 350 insertions(+), 4 deletions(-)
>
>
> >
> > diff --git a/drivers/net/virtio_net.c b/drivers/net/virtio_net.c
> > index 31b9ead6260d..1f4d9605552f 100644
> > --- a/drivers/net/virtio_net.c
> > +++ b/drivers/net/virtio_net.c
> > @@ -127,6 +127,113 @@ static const struct virtnet_stat_desc virtnet_rq_stats_desc[] = {
> >  #define VIRTNET_SQ_STATS_LEN	ARRAY_SIZE(virtnet_sq_stats_desc)
> >  #define VIRTNET_RQ_STATS_LEN	ARRAY_SIZE(virtnet_rq_stats_desc)
> >
> > +#define VIRTNET_STATS_DESC(qtype, class, name) \
> > +	{#name, offsetof(struct virtio_net_stats_ ## qtype ## _ ## class, qtype ## _ ## name)}
> > +
> > +static const struct virtnet_stat_desc virtnet_stats_cvq_desc[] = {
> > +	{"command_num", offsetof(struct virtio_net_stats_cvq, command_num)},
> > +	{"ok_num", offsetof(struct virtio_net_stats_cvq, ok_num)}
> > +};
>
> Use named initializers please this is confusing enough.

Do you mean that I donot use the marco VIRTNET_STATS_DESC?


>
> > +
> > +static const struct virtnet_stat_desc virtnet_stats_rx_basic_desc[] = {
> > +	VIRTNET_STATS_DESC(rx, basic, packets),
> > +	VIRTNET_STATS_DESC(rx, basic, bytes),
> > +
> > +	VIRTNET_STATS_DESC(rx, basic, notifications),
> > +	VIRTNET_STATS_DESC(rx, basic, interrupts),
> > +
> > +	VIRTNET_STATS_DESC(rx, basic, drops),
> > +	VIRTNET_STATS_DESC(rx, basic, drop_overruns),
> > +};
> > +
> > +static const struct virtnet_stat_desc virtnet_stats_tx_basic_desc[] = {
> > +	VIRTNET_STATS_DESC(tx, basic, packets),
> > +	VIRTNET_STATS_DESC(tx, basic, bytes),
> > +
> > +	VIRTNET_STATS_DESC(tx, basic, notifications),
> > +	VIRTNET_STATS_DESC(tx, basic, interrupts),
> > +
> > +	VIRTNET_STATS_DESC(tx, basic, drops),
> > +	VIRTNET_STATS_DESC(tx, basic, drop_malformed),
> > +};
> > +
> > +static const struct virtnet_stat_desc virtnet_stats_rx_csum_desc[] = {
> > +	VIRTNET_STATS_DESC(rx, csum, csum_valid),
> > +	VIRTNET_STATS_DESC(rx, csum, needs_csum),
> > +
> > +	VIRTNET_STATS_DESC(rx, csum, csum_none),
> > +	VIRTNET_STATS_DESC(rx, csum, csum_bad),
> > +};
> > +
> > +static const struct virtnet_stat_desc virtnet_stats_tx_csum_desc[] = {
> > +	VIRTNET_STATS_DESC(tx, csum, needs_csum),
> > +	VIRTNET_STATS_DESC(tx, csum, csum_none),
> > +};
> > +
> > +static const struct virtnet_stat_desc virtnet_stats_rx_gso_desc[] = {
> > +	VIRTNET_STATS_DESC(rx, gso, gso_packets),
> > +	VIRTNET_STATS_DESC(rx, gso, gso_bytes),
> > +	VIRTNET_STATS_DESC(rx, gso, gso_packets_coalesced),
> > +	VIRTNET_STATS_DESC(rx, gso, gso_bytes_coalesced),
> > +};
> > +
> > +static const struct virtnet_stat_desc virtnet_stats_tx_gso_desc[] = {
> > +	VIRTNET_STATS_DESC(tx, gso, gso_packets),
> > +	VIRTNET_STATS_DESC(tx, gso, gso_bytes),
> > +	VIRTNET_STATS_DESC(tx, gso, gso_segments),
> > +	VIRTNET_STATS_DESC(tx, gso, gso_segments_bytes),
> > +	VIRTNET_STATS_DESC(tx, gso, gso_packets_noseg),
> > +	VIRTNET_STATS_DESC(tx, gso, gso_bytes_noseg),
> > +};
> > +
> > +static const struct virtnet_stat_desc virtnet_stats_rx_speed_desc[] = {
> > +	VIRTNET_STATS_DESC(rx, speed, packets_allowance_exceeded),
> > +	VIRTNET_STATS_DESC(rx, speed, bytes_allowance_exceeded),
> > +};
> > +
> > +static const struct virtnet_stat_desc virtnet_stats_tx_speed_desc[] = {
> > +	VIRTNET_STATS_DESC(tx, speed, packets_allowance_exceeded),
> > +	VIRTNET_STATS_DESC(tx, speed, packets_allowance_exceeded),
> > +};
> > +
> > +struct virtnet_stats_map {
>
> This seems to be somehow trying to do a table driven design?
> All this effort does not seem to have resulted in less or
> cleaner code.

I think this works.

If we has not a table of all hw stats.
How can we parse the stats from the device?
A huge if-else?


>
> Keep it simple: for each structure add a function decoding from
> UAPI format to ethtool format. No offsetof games nothing.

That will make a mass of small same functions.


>
>
>
>
> > +	u64 flag;
>
> is it a single flag rly?
>
> > +	u32 len;
>
> len here means "bytes"?
>
> > +	u32 num;
> > +
> > +#define VIRTNET_STATS_Q_TYPE_RX 0
> > +#define VIRTNET_STATS_Q_TYPE_TX 1
> > +#define VIRTNET_STATS_Q_TYPE_CQ 2
> > +	u32 queue_type;
> > +
> > +	u8 type;
> > +	const struct virtnet_stat_desc *desc;
> > +};
> > +
> > +#define VIRTNET_DEVICE_STATS_MAP_ITEM(TYPE, type, queue_type)	\
> > +	{							\
> > +		VIRTIO_NET_STATS_TYPE_##TYPE,			\
> > +		sizeof(struct virtio_net_stats_ ## type),	\
> > +		ARRAY_SIZE(virtnet_stats_ ## type ##_desc),	\
> > +		VIRTNET_STATS_Q_TYPE_##queue_type,		\
> > +		VIRTIO_NET_STATS_TYPE_REPLY_##TYPE,		\
> > +		&virtnet_stats_##type##_desc[0]			\
> > +	}
> > +
> > +static struct virtnet_stats_map virtio_net_stats_map[] = {
> > +	VIRTNET_DEVICE_STATS_MAP_ITEM(CVQ, cvq, CQ),
> > +
> > +	VIRTNET_DEVICE_STATS_MAP_ITEM(RX_BASIC, rx_basic, RX),
> > +	VIRTNET_DEVICE_STATS_MAP_ITEM(RX_CSUM,  rx_csum,  RX),
> > +	VIRTNET_DEVICE_STATS_MAP_ITEM(RX_GSO,   rx_gso,   RX),
> > +	VIRTNET_DEVICE_STATS_MAP_ITEM(RX_SPEED, rx_speed, RX),
> > +
> > +	VIRTNET_DEVICE_STATS_MAP_ITEM(TX_BASIC, tx_basic, TX),
> > +	VIRTNET_DEVICE_STATS_MAP_ITEM(TX_CSUM,  tx_csum,  TX),
> > +	VIRTNET_DEVICE_STATS_MAP_ITEM(TX_GSO,   tx_gso,   TX),
> > +	VIRTNET_DEVICE_STATS_MAP_ITEM(TX_SPEED, tx_speed, TX),
> > +};
> > +
> >  struct virtnet_interrupt_coalesce {
> >  	u32 max_packets;
> >  	u32 max_usecs;
> > @@ -232,6 +339,7 @@ struct control_buf {
> >  	struct virtio_net_ctrl_coal_tx coal_tx;
> >  	struct virtio_net_ctrl_coal_rx coal_rx;
> >  	struct virtio_net_ctrl_coal_vq coal_vq;
> > +	struct virtio_net_stats_capabilities stats_cap;
> >  };
> >
> >  struct virtnet_info {
> > @@ -314,6 +422,8 @@ struct virtnet_info {
> >
> >  	/* failover when STANDBY feature enabled */
> >  	struct failover *failover;
> > +
> > +	u64 device_stats_cap;
> >  };
> >
> >  struct padded_vnet_hdr {
> > @@ -3157,6 +3267,204 @@ static int virtnet_set_channels(struct net_device *dev,
> >  	return err;
> >  }
> >
> > +static void virtnet_get_hw_stats_string(struct virtnet_info *vi, int type, int qid, u8 **data)
> > +{
> > +	struct virtnet_stats_map *m;
> > +	int i, j;
> > +	u8 *p = *data;
> > +
> > +	if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_DEVICE_STATS))
> > +		return;
> > +
> > +	for (i = 0; i < ARRAY_SIZE(virtio_net_stats_map); ++i) {
> > +		m = &virtio_net_stats_map[i];
> > +
> > +		if (m->queue_type != type)
> > +			continue;
> > +
> > +		if (!(vi->device_stats_cap & m->flag))
> > +			continue;
> > +
> > +		for (j = 0; j < m->num; ++j) {
> > +			if (type == VIRTNET_STATS_Q_TYPE_RX)
> > +				ethtool_sprintf(&p, "rx_queue_hw_%u_%s", qid, m->desc[j].desc);
> > +
> > +			else if (type == VIRTNET_STATS_Q_TYPE_TX)
> > +				ethtool_sprintf(&p, "tx_queue_hw_%u_%s", qid, m->desc[j].desc);
> > +
> > +			else if (type == VIRTNET_STATS_Q_TYPE_CQ)
> > +				ethtool_sprintf(&p, "cq_hw_%s", m->desc[j].desc);
>
> what is this XX_queue_hw_ cuteness? I don't see other drivers
> doing this.

We has "bytes", "packets" from the driver and the same from the device.
I want to distinguish that.





>
> > +		}
> > +	}
> > +
> > +	*data = p;
> > +}
> > +
> > +struct virtnet_stats_ctx {
>
> what is this struct? I don't understand the need for this one either.
> If you want a union of UAPI types just do that.
>
>
> > +	u32 num_cq;
> > +	u32 num_rx;
> > +	u32 num_tx;
> > +
> > +	u64 bitmap_cq;
> > +	u64 bitmap_rx;
> > +	u64 bitmap_tx;
>
> Can't this be an array indexed by type?

Yes, It can be  array. But I like ctx.bitmap_tx no ctx.bitmaps[TX].
I think ctx.bitmap_tx is more convenient.



>
> > +
> > +	u32 size_cq;
> > +	u32 size_rx;
> > +	u32 size_tx;
>
> Using "size" to mean "bytes" is weird.


YES. bytes is better than size here.

Thanks


>
> > +
> > +	u64 *data;
> > +};
> > +
> > +static void virtnet_stats_ctx_init(struct virtnet_info *vi,
> > +				   struct virtnet_stats_ctx *ctx,
> > +				   u64 *data)
> > +{
> > +	struct virtnet_stats_map *m;
> > +	int i;
> > +
> > +	ctx->data = data;
> > +
> > +	for (i = 0; i < ARRAY_SIZE(virtio_net_stats_map); ++i) {
> > +		m = &virtio_net_stats_map[i];
> > +
> > +		if (vi->device_stats_cap & m->flag) {
> > +			if (m->queue_type == VIRTNET_STATS_Q_TYPE_CQ) {
> > +				ctx->bitmap_cq |= m->flag;
> > +				ctx->num_cq += m->num;
> > +				ctx->size_cq += m->len;
> > +			}
> > +
> > +			if (m->queue_type == VIRTNET_STATS_Q_TYPE_RX) {
> > +				ctx->bitmap_rx |= m->flag;
> > +				ctx->num_rx += m->num;
> > +				ctx->size_rx += m->len;
> > +			}
> > +
> > +			if (m->queue_type == VIRTNET_STATS_Q_TYPE_TX) {
> > +				ctx->bitmap_tx |= m->flag;
> > +				ctx->num_tx += m->num;
> > +				ctx->size_tx += m->len;
> > +			}
> > +		}
> > +	}
> > +}
> > +
> > +static int virtnet_get_hw_stats(struct virtnet_info *vi,
> > +				struct virtnet_stats_ctx *ctx)
> > +{
> > +	struct virtio_net_ctrl_queue_stats *req;
> > +	struct virtio_net_stats_reply_hdr *hdr;
> > +	struct scatterlist sgs_in, sgs_out;
> > +	u32 num_rx, num_tx, num_cq, offset;
> > +	int qnum, i, j,  qid, res_size;
> > +	struct virtnet_stats_map *m;
> > +	void *reply, *p;
> > +	u64 bitmap;
> > +	int ok;
> > +	u64 *v;
> > +
> > +	if (!virtio_has_feature(vi->vdev, VIRTIO_NET_F_DEVICE_STATS))
> > +		return 0;
> > +
> > +	qnum = 0;
> > +	if (ctx->bitmap_cq)
> > +		qnum += 1;
> > +
> > +	if (ctx->bitmap_rx)
> > +		qnum += vi->curr_queue_pairs;
> > +
> > +	if (ctx->bitmap_tx)
> > +		qnum += vi->curr_queue_pairs;
> > +
> > +	req = kcalloc(qnum, sizeof(*req), GFP_KERNEL);
> > +	if (!req)
> > +		return -ENOMEM;
> > +
> > +	res_size = (ctx->size_rx + ctx->size_tx) * vi->curr_queue_pairs + ctx->size_cq;
> > +	reply = kmalloc(res_size, GFP_KERNEL);
> > +	if (!reply) {
> > +		kfree(req);
> > +		return -ENOMEM;
> > +	}
> > +
> > +	j = 0;
> > +	for (i = 0; i < vi->curr_queue_pairs; ++i) {
> > +		if (ctx->bitmap_rx) {
> > +			req->stats[j].vq_index = cpu_to_le16(i * 2);
> > +			req->stats[j].types_bitmap[0] = cpu_to_le64(ctx->bitmap_rx);
> > +			++j;
> > +		}
> > +
> > +		if (ctx->bitmap_tx) {
> > +			req->stats[j].vq_index = cpu_to_le16(i * 2 + 1);
> > +			req->stats[j].types_bitmap[0] = cpu_to_le64(ctx->bitmap_tx);
> > +			++j;
> > +		}
> > +	}
> > +
> > +	if (ctx->size_cq) {
> > +		req->stats[j].vq_index = cpu_to_le16(vi->max_queue_pairs * 2);
> > +		req->stats[j].types_bitmap[0] = cpu_to_le64(ctx->bitmap_cq);
> > +		++j;
> > +	}
> > +
> > +	sg_init_one(&sgs_out, req, sizeof(*req) * j);
> > +	sg_init_one(&sgs_in, reply, res_size);
> > +
> > +	ok = virtnet_send_command(vi, VIRTIO_NET_CTRL_STATS,
> > +				  VIRTIO_NET_CTRL_STATS_GET,
> > +				  &sgs_out, &sgs_in);
> > +	kfree(req);
> > +
> > +	if (!ok) {
> > +		kfree(reply);
> > +		return ok;
> > +	}
> > +
> > +	num_rx = VIRTNET_RQ_STATS_LEN + ctx->num_rx;
> > +	num_tx = VIRTNET_SQ_STATS_LEN + ctx->num_tx;
> > +	num_cq = ctx->num_tx;
> > +
> > +	for (p = reply; p - reply < res_size; p += virtio16_to_cpu(vi->vdev, hdr->size)) {
> > +		hdr = p;
> > +
> > +		qid = virtio16_to_cpu(vi->vdev, hdr->vq_index);
> > +
> > +		if (qid == vi->max_queue_pairs * 2) {
> > +			offset = 0;
> > +			bitmap = ctx->bitmap_cq;
> > +		} else if (qid % 2) {
> > +			offset = num_cq + num_rx * vi->curr_queue_pairs + num_tx * (qid / 2);
> > +			offset += VIRTNET_SQ_STATS_LEN;
> > +			bitmap = ctx->bitmap_tx;
> > +		} else {
> > +			offset = num_cq + num_rx * (qid / 2) + VIRTNET_RQ_STATS_LEN;
> > +			bitmap = ctx->bitmap_rx;
> > +		}
> > +
> > +		for (i = 0; i < ARRAY_SIZE(virtio_net_stats_map); ++i) {
> > +			m = &virtio_net_stats_map[i];
> > +
> > +			if (m->flag & bitmap)
> > +				offset += m->num;
> > +
> > +			if (hdr->type != m->type)
> > +				continue;
> > +
> > +			for (j = 0; j < m->num; ++j) {
> > +				v = p + m->desc[j].offset;
> > +				ctx->data[offset + j] = virtio64_to_cpu(vi->vdev, *v);
> > +			}
> > +
> > +			break;
> > +		}
> > +	}
> > +
> > +	kfree(reply);
> > +	return 0;
> > +}
> > +
> >  static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data)
> >  {
> >  	struct virtnet_info *vi = netdev_priv(dev);
> > @@ -3165,16 +3473,22 @@ static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data)
> >
> >  	switch (stringset) {
> >  	case ETH_SS_STATS:
> > +		virtnet_get_hw_stats_string(vi, VIRTNET_STATS_Q_TYPE_CQ, 0, &p);
> > +
> >  		for (i = 0; i < vi->curr_queue_pairs; i++) {
> >  			for (j = 0; j < VIRTNET_RQ_STATS_LEN; j++)
> >  				ethtool_sprintf(&p, "rx_queue_%u_%s", i,
> >  						virtnet_rq_stats_desc[j].desc);
> > +
> > +			virtnet_get_hw_stats_string(vi, VIRTNET_STATS_Q_TYPE_RX, i, &p);
> >  		}
> >
> >  		for (i = 0; i < vi->curr_queue_pairs; i++) {
> >  			for (j = 0; j < VIRTNET_SQ_STATS_LEN; j++)
> >  				ethtool_sprintf(&p, "tx_queue_%u_%s", i,
> >  						virtnet_sq_stats_desc[j].desc);
> > +
> > +			virtnet_get_hw_stats_string(vi, VIRTNET_STATS_Q_TYPE_TX, i, &p);
> >  		}
> >  		break;
> >  	}
> > @@ -3183,11 +3497,35 @@ static void virtnet_get_strings(struct net_device *dev, u32 stringset, u8 *data)
> >  static int virtnet_get_sset_count(struct net_device *dev, int sset)
> >  {
> >  	struct virtnet_info *vi = netdev_priv(dev);
> > +	struct virtnet_stats_ctx ctx = {0};
> > +	u32 pair_count;
> >
> >  	switch (sset) {
> >  	case ETH_SS_STATS:
> > -		return vi->curr_queue_pairs * (VIRTNET_RQ_STATS_LEN +
> > -					       VIRTNET_SQ_STATS_LEN);
> > +		if (virtio_has_feature(vi->vdev, VIRTIO_NET_F_DEVICE_STATS) &&
> > +		    !vi->device_stats_cap) {
> > +			struct scatterlist sg;
> > +
> > +			sg_init_one(&sg, &vi->ctrl->stats_cap, sizeof(vi->ctrl->stats_cap));
> > +
> > +			if (!virtnet_send_command(vi, VIRTIO_NET_CTRL_STATS,
> > +						  VIRTIO_NET_CTRL_STATS_QUERY,
> > +						  NULL, &sg)) {
> > +				dev_warn(&dev->dev, "Fail to get stats capability\n");
> > +			} else {
> > +				__le64 v;
> > +
> > +				v = vi->ctrl->stats_cap.supported_stats_types[0];
> > +				vi->device_stats_cap = virtio64_to_cpu(vi->vdev, v);
> > +			}
> > +		}
> > +
> > +		virtnet_stats_ctx_init(vi, &ctx, NULL);
> > +
> > +		pair_count = VIRTNET_RQ_STATS_LEN + VIRTNET_SQ_STATS_LEN;
> > +		pair_count += ctx.num_rx + ctx.num_tx;
> > +
> > +		return ctx.num_cq + vi->curr_queue_pairs * pair_count;
> >  	default:
> >  		return -EOPNOTSUPP;
> >  	}
> > @@ -3197,11 +3535,17 @@ static void virtnet_get_ethtool_stats(struct net_device *dev,
> >  				      struct ethtool_stats *stats, u64 *data)
> >  {
> >  	struct virtnet_info *vi = netdev_priv(dev);
> > -	unsigned int idx = 0, start, i, j;
> > +	struct virtnet_stats_ctx ctx = {0};
> > +	unsigned int idx, start, i, j;
> >  	const u8 *stats_base;
> >  	const u64_stats_t *p;
> >  	size_t offset;
> >
> > +	virtnet_stats_ctx_init(vi, &ctx, data);
> > +	virtnet_get_hw_stats(vi, &ctx);
> > +
> > +	idx = ctx.num_cq;
> > +
> >  	for (i = 0; i < vi->curr_queue_pairs; i++) {
> >  		struct receive_queue *rq = &vi->rq[i];
> >
> > @@ -3215,6 +3559,7 @@ static void virtnet_get_ethtool_stats(struct net_device *dev,
> >  			}
> >  		} while (u64_stats_fetch_retry(&rq->stats.syncp, start));
> >  		idx += VIRTNET_RQ_STATS_LEN;
> > +		idx += ctx.num_rx;
> >  	}
> >
> >  	for (i = 0; i < vi->curr_queue_pairs; i++) {
> > @@ -3230,6 +3575,7 @@ static void virtnet_get_ethtool_stats(struct net_device *dev,
> >  			}
> >  		} while (u64_stats_fetch_retry(&sq->stats.syncp, start));
> >  		idx += VIRTNET_SQ_STATS_LEN;
> > +		idx += ctx.num_tx;
> >  	}
> >  }
> >
> > @@ -4760,7 +5106,7 @@ static struct virtio_device_id id_table[] = {
> >  	VIRTIO_NET_F_SPEED_DUPLEX, VIRTIO_NET_F_STANDBY, \
> >  	VIRTIO_NET_F_RSS, VIRTIO_NET_F_HASH_REPORT, VIRTIO_NET_F_NOTF_COAL, \
> >  	VIRTIO_NET_F_VQ_NOTF_COAL, \
> > -	VIRTIO_NET_F_GUEST_HDRLEN
> > +	VIRTIO_NET_F_GUEST_HDRLEN, VIRTIO_NET_F_DEVICE_STATS
> >
> >  static unsigned int features[] = {
> >  	VIRTNET_FEATURES,
> > --
> > 2.32.0.3.g01195cf9f
>

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