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Date:   Tue, 27 Jun 2017 23:15:20 -0700
From:   Jakub Kicinski <jakub.kicinski@...ronome.com>
To:     Simon Horman <simon.horman@...ronome.com>
Cc:     David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
        oss-drivers@...ronome.com,
        Pieter Jansen van Vuuren 
        <pieter.jansenvanvuuren@...ronome.com>
Subject: Re: [PATCH/RFC net-next 7/9] nfp: add metadata to each flow offload

On Wed, 28 Jun 2017 01:21:47 +0200, Simon Horman wrote:
> From: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@...ronome.com>
> 
> Adds metadata describing the mask id of each flow and keeps track of
> flows installed in hardware. Previously a flow could not be removed
> from hardware as there was no way of knowing if that a specific flow
> was installed. This is solved by storing the offloaded flows in a
> hash table.
> 
> Signed-off-by: Pieter Jansen van Vuuren <pieter.jansenvanvuuren@...ronome.com>
> Signed-off-by: Simon Horman <simon.horman@...ronome.com>

> diff --git a/drivers/net/ethernet/netronome/nfp/flower/main.h b/drivers/net/ethernet/netronome/nfp/flower/main.h
> index 52db2acb250e..cc184618306c 100644
> --- a/drivers/net/ethernet/netronome/nfp/flower/main.h
> +++ b/drivers/net/ethernet/netronome/nfp/flower/main.h
> @@ -34,6 +34,7 @@
>  #ifndef __NFP_FLOWER_H__
>  #define __NFP_FLOWER_H__ 1
>  
> +#include <linux/circ_buf.h>
>  #include <linux/types.h>
>  
>  #include "cmsg.h"
> @@ -45,6 +46,42 @@ struct tc_to_netdev;
>  struct net_device;
>  struct nfp_app;
>  
> +#define NFP_FLOWER_HASH_BITS		10
> +#define NFP_FLOWER_HASH_SEED		129004
> +
> +#define NFP_FLOWER_MASK_ENTRY_RS	256
> +#define NFP_FLOWER_MASK_ELEMENT_RS	1
> +#define NFP_FLOWER_MASK_HASH_BITS	10
> +#define NFP_FLOWER_MASK_HASH_SEED	9198806
> +
> +#define NFP_FL_META_FLAG_NEW_MASK	128
> +#define NFP_FL_META_FLAG_LAST_MASK	1
> +
> +#define NFP_FL_MASK_REUSE_TIME		40
> +#define NFP_FL_MASK_ID_LOCATION		1
> +
> +struct nfp_fl_mask_id {
> +	struct circ_buf mask_id_free_list;
> +	struct timeval *last_used;
> +	u8 init_unallocated;
> +};
> +
> +/**
> + * struct nfp_flower_priv - Flower APP per-vNIC priv data
> + * @nn:			Pointer to vNIC
> + * @flower_version:	HW version of flower
> + * @mask_ids:		List of free mask ids
> + * @mask_table:		Hash table used to store masks
> + * @flow_table:		Hash table used to store flower rules
> + */
> +struct nfp_flower_priv {
> +	struct nfp_net *nn;
> +	u64 flower_version;
> +	struct nfp_fl_mask_id mask_ids;
> +	DECLARE_HASHTABLE(mask_table, NFP_FLOWER_MASK_HASH_BITS);
> +	DECLARE_HASHTABLE(flow_table, NFP_FLOWER_HASH_BITS);

Include for hashtable seems missing.

> +};
> +
>  struct nfp_fl_key_ls {
>  	u32 key_layer_two;
>  	u8 key_layer;
> @@ -69,6 +106,10 @@ struct nfp_fl_payload {
>  	char *action_data;
>  };
>  
> +int nfp_flower_metadata_init(struct nfp_app *app);
> +void nfp_flower_metadata_cleanup(struct nfp_app *app);
> +
> +int nfp_repr_get_port_id(struct net_device *netdev);

Isn't this a static inline in repr.h?

>  int nfp_flower_repr_init(struct nfp_app *app);
>  int nfp_flower_setup_tc(struct nfp_app *app, struct net_device *netdev,
>  			u32 handle, __be16 proto, struct tc_to_netdev *tc);

> diff --git a/drivers/net/ethernet/netronome/nfp/flower/metadata.c b/drivers/net/ethernet/netronome/nfp/flower/metadata.c
> new file mode 100644
> index 000000000000..acbf4c757988

> + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
> + * SOFTWARE.
> + */
> +
> +#include <asm/timex.h>

I think this is unnecessary.

> +#include <linux/hash.h>
> +#include <linux/hashtable.h>
> +#include <linux/jhash.h>
> +#include <linux/vmalloc.h>
> +#include <net/pkt_cls.h>

> +static int nfp_mask_alloc(struct nfp_app *app, u8 *mask_id)
> +{
> +	struct nfp_flower_priv *priv = app->priv;
> +	struct timeval reuse, curr;
> +	struct circ_buf *ring;
> +	u8 temp_id, freed_id;
> +
> +	ring = &priv->mask_ids.mask_id_free_list;
> +	freed_id = NFP_FLOWER_MASK_ENTRY_RS - 1;
> +	/* Checking for unallocated entries first. */
> +	if (priv->mask_ids.init_unallocated > 0) {
> +		*mask_id = priv->mask_ids.init_unallocated;
> +		priv->mask_ids.init_unallocated--;
> +		goto exit_check_timestamp;

Do you really need to check the timestamp here?  Isn't this if() for the
case where we have some masks which were never used by the driver?

> +	}
> +
> +	/* Checking if buffer is empty. */
> +	if (ring->head == ring->tail) {
> +		*mask_id = freed_id;
> +		return -ENOENT;
> +	}
> +
> +	memcpy(&temp_id, &ring->buf[ring->tail], NFP_FLOWER_MASK_ELEMENT_RS);
> +	*mask_id = temp_id;
> +	memcpy(&ring->buf[ring->tail], &freed_id, NFP_FLOWER_MASK_ELEMENT_RS);
> +
> +	ring->tail = (ring->tail + NFP_FLOWER_MASK_ELEMENT_RS) %
> +		     (NFP_FLOWER_MASK_ENTRY_RS * NFP_FLOWER_MASK_ELEMENT_RS);
> +
> +exit_check_timestamp:
> +	do_gettimeofday(&curr);
> +	reuse.tv_sec = curr.tv_sec -
> +		       priv->mask_ids.last_used[*mask_id].tv_sec;
> +	reuse.tv_usec = curr.tv_usec -
> +			priv->mask_ids.last_used[*mask_id].tv_usec;

Could you perhaps use timespec64 as the type?  You will then be able to
use timespec64_sub() and it will save a nsec -> usec conversion in
do_gettimeofday().

> +	if (!reuse.tv_sec && reuse.tv_usec < NFP_FL_MASK_REUSE_TIME) {
> +		nfp_release_mask_id(app, *mask_id);
> +		return -ENOENT;
> +	}
> +
> +	return 0;
> +}
> +
> +static int
> +nfp_add_mask_table(struct nfp_app *app, char *mask_data, u32 mask_len)
> +{
> +	struct nfp_flower_priv *priv = app->priv;
> +	struct nfp_mask_id_table *mask_entry;
> +	unsigned long hash_key;
> +	u8 mask_id;
> +
> +	if (nfp_mask_alloc(app, &mask_id))
> +		return -ENOENT;
> +
> +	mask_entry = kmalloc(sizeof(*mask_entry), GFP_ATOMIC);

GFP_KERNEL, I think there used to be a spinlock around this which is no
more?

> +	if (!mask_entry) {
> +		nfp_release_mask_id(app, mask_id);
> +		return -ENOMEM;
> +	}
> +
> +	INIT_HLIST_NODE(&mask_entry->link);
> +	mask_entry->mask_id = mask_id;
> +	hash_key = jhash(mask_data, mask_len, NFP_FLOWER_MASK_HASH_SEED);
> +	mask_entry->hash_key = hash_key;
> +	mask_entry->ref_cnt = 1;
> +	hash_add(priv->mask_table, &mask_entry->link, hash_key);
> +
> +	return mask_id;
> +}

> +static int
> +nfp_check_mask_add(struct nfp_app *app, char *mask_data, u32 mask_len,
> +		   u8 *mask_id)
> +{
> +	int allocate_mask;

bool? (same for the return type)

> +	int err;
> +
> +	allocate_mask = 0;
> +	err = nfp_find_in_mask_table(app, mask_data, mask_len);
> +	if (err < 0) {
> +		/* Could not find an existing mask id. */
> +		allocate_mask = NFP_FL_META_FLAG_NEW_MASK;
> +		err = nfp_add_mask_table(app, mask_data, mask_len);
> +		if (err < 0)
> +			return -ENOENT;
> +	}
> +	*mask_id = err;
> +
> +	return allocate_mask;
> +}

> +int nfp_flower_metadata_init(struct nfp_app *app)
> +{
> +	struct nfp_flower_priv *priv = app->priv;
> +
> +	hash_init(priv->mask_table);
> +	hash_init(priv->flow_table);
> +
> +	/* Init ring buffer and unallocated mask_ids. */
> +	priv->mask_ids.mask_id_free_list.buf =
> +		kzalloc(NFP_FLOWER_MASK_ENTRY_RS * NFP_FLOWER_MASK_ELEMENT_RS,
> +			GFP_KERNEL);

Is zeroing this memory necessary?

> +	if (!priv->mask_ids.mask_id_free_list.buf)
> +		return -ENOMEM;
> +
> +	priv->mask_ids.init_unallocated = NFP_FLOWER_MASK_ENTRY_RS - 1;
> +
> +	/* Init timestamps for mask id*/
> +	priv->mask_ids.last_used = kcalloc(NFP_FLOWER_MASK_ENTRY_RS,
> +					   sizeof(*priv->mask_ids.last_used),
> +					   GFP_KERNEL);

And this, potentially?

> +	if (!priv->mask_ids.last_used) {
> +		kfree(priv->mask_ids.mask_id_free_list.buf);
> +		return -ENOMEM;
> +	}
> +
> +	priv->flower_version = 0;
> +
> +	return 0;
> +}

> diff --git a/drivers/net/ethernet/netronome/nfp/flower/offload.c b/drivers/net/ethernet/netronome/nfp/flower/offload.c
> index c8f9e2996cc6..a7f688bbc761 100644
> --- a/drivers/net/ethernet/netronome/nfp/flower/offload.c
> +++ b/drivers/net/ethernet/netronome/nfp/flower/offload.c

> @@ -297,6 +318,9 @@ int nfp_flower_repr_init(struct nfp_app *app)
>  	u64 version;
>  	int err;
>  
> +	if (nfp_flower_metadata_init(app) < 0)
> +		return -EOPNOTSUPP;

app init candidate.

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