net/mlx5: fix NVGRE matching

Message ID 3cd91c82dfa7f0feb325c0ed866659c07230c9fb.1563478228.git.dekelp@mellanox.com
State Superseded, archived
Delegated to: Raslan Darawsheh
Headers show
Series
  • net/mlx5: fix NVGRE matching
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Checks

Context Check Description
ci/Intel-compilation fail apply issues
ci/checkpatch success coding style OK

Commit Message

Dekel Peled July 18, 2019, 7:42 p.m.
NVGRE has a GRE header with c_rsvd0_ver value 0x2000 and protocol
value 0x6558.
These should be matched when item_nvgre is provided.

This patch adds validation function of NVGRE item, to validate that
the input values, if exist, are as required.
It also updates the translate function of NVGRE item, to add the
required values, if they were not specified.

Original work by Xiaoyu Min <jackmin@mellanox.com>

Fixes: fc2c498ccb94 ("net/mlx5: add Direct Verbs translate items")
Signed-off-by: Dekel Peled <dekelp@mellanox.com>
---
 drivers/net/mlx5/mlx5_flow.c    | 69 +++++++++++++++++++++++++++++++++++++++++
 drivers/net/mlx5/mlx5_flow.h    | 10 ++++--
 drivers/net/mlx5/mlx5_flow_dv.c | 25 +++++++++++++--
 drivers/net/mlx5/mlx5_rxtx.h    |  2 +-
 4 files changed, 101 insertions(+), 5 deletions(-)

Comments

Xiaoyu Min July 22, 2019, 9:30 a.m. | #1
On Thu, 19-07-18, 22:42, Dekel Peled wrote:
> NVGRE has a GRE header with c_rsvd0_ver value 0x2000 and protocol
> value 0x6558.
> These should be matched when item_nvgre is provided.
> 
> This patch adds validation function of NVGRE item, to validate that
> the input values, if exist, are as required.
> It also updates the translate function of NVGRE item, to add the
> required values, if they were not specified.
> 
> Original work by Xiaoyu Min <jackmin@mellanox.com>
> 
> Fixes: fc2c498ccb94 ("net/mlx5: add Direct Verbs translate items")
> Signed-off-by: Dekel Peled <dekelp@mellanox.com>
> ---
>  drivers/net/mlx5/mlx5_flow.c    | 69 +++++++++++++++++++++++++++++++++++++++++
>  drivers/net/mlx5/mlx5_flow.h    | 10 ++++--
>  drivers/net/mlx5/mlx5_flow_dv.c | 25 +++++++++++++--
>  drivers/net/mlx5/mlx5_rxtx.h    |  2 +-
>  4 files changed, 101 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
> index e082cbb..6aca4d6 100644
> --- a/drivers/net/mlx5/mlx5_flow.c
> +++ b/drivers/net/mlx5/mlx5_flow.c
> @@ -298,6 +298,10 @@ struct mlx5_flow_tunnel_info {
>  		.tunnel = MLX5_FLOW_LAYER_MPLS,
>  		.ptype = RTE_PTYPE_TUNNEL_MPLS_IN_GRE,
>  	},
> +	{
> +		.tunnel = MLX5_FLOW_LAYER_NVGRE,
> +		.ptype = RTE_PTYPE_TUNNEL_NVGRE,
> +	},
>  };
>  
>  /**
> @@ -1323,6 +1327,11 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
>  		return rte_flow_error_set(error, EINVAL,
>  					  RTE_FLOW_ERROR_TYPE_ITEM, item,
>  					  "L3 cannot follow an L4 layer.");
> +	else if ((item_flags & MLX5_FLOW_LAYER_NVGRE) &&
> +		  !(item_flags & MLX5_FLOW_LAYER_INNER_L2))
> +		return rte_flow_error_set(error, EINVAL,
> +					  RTE_FLOW_ERROR_TYPE_ITEM, item,
> +					  "L3 cannot follow an NVGRE layer.");
>  	if (!mask)
>  		mask = &rte_flow_item_ipv4_mask;
>  	else if (mask->hdr.next_proto_id != 0 &&
> @@ -1409,6 +1418,11 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
>  		return rte_flow_error_set(error, EINVAL,
>  					  RTE_FLOW_ERROR_TYPE_ITEM, item,
>  					  "L3 cannot follow an L4 layer.");
> +	else if ((item_flags & MLX5_FLOW_LAYER_NVGRE) &&
> +		  !(item_flags & MLX5_FLOW_LAYER_INNER_L2))
> +		return rte_flow_error_set(error, EINVAL,
> +					  RTE_FLOW_ERROR_TYPE_ITEM, item,
> +					  "L3 cannot follow an NVGRE layer.");
>  	if (!mask)
>  		mask = &rte_flow_item_ipv6_mask;
>  	ret = mlx5_flow_item_acceptable(item, (const uint8_t *)mask,
> @@ -1887,6 +1901,61 @@ uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
>  				  " update.");
>  }
>  
> +/**
> + * Validate NVGRE item.
> + *
> + * @param[in] item
> + *   Item specification.
> + * @param[in] item_flags
> + *   Bit flags to mark detected items.
> + * @param[in] target_protocol
> + *   The next protocol in the previous item.
> + * @param[out] error
> + *   Pointer to error structure.
> + *
> + * @return
> + *   0 on success, a negative errno value otherwise and rte_errno is set.
> + */
> +int
> +mlx5_flow_validate_item_nvgre(const struct rte_flow_item *item,
> +			      uint64_t item_flags,
> +			      uint8_t target_protocol,
> +			      struct rte_flow_error *error)
> +{
> +	const struct rte_flow_item_nvgre *mask = item->mask;
> +	const struct rte_flow_item_nvgre *spec = item->spec;
> +	int ret;
> +
> +	if (target_protocol != 0xff && target_protocol != IPPROTO_GRE)
> +		return rte_flow_error_set(error, EINVAL,
> +					  RTE_FLOW_ERROR_TYPE_ITEM, item,
> +					  "protocol filtering not compatible"
> +					  " with this GRE layer");
> +	if (item_flags & MLX5_FLOW_LAYER_TUNNEL)
> +		return rte_flow_error_set(error, ENOTSUP,
> +					  RTE_FLOW_ERROR_TYPE_ITEM, item,
> +					  "multiple tunnel layers not"
> +					  " supported");
> +	if (!(item_flags & MLX5_FLOW_LAYER_OUTER_L3))
> +		return rte_flow_error_set(error, ENOTSUP,
> +					  RTE_FLOW_ERROR_TYPE_ITEM, item,
> +					  "L3 Layer is missing");
> +	if (spec && (spec->protocol != RTE_BE16(RTE_ETHER_TYPE_TEB) ||
> +		     spec->c_k_s_rsvd0_ver != RTE_BE16(0x2000)))
> +		return rte_flow_error_set(error, EINVAL,
> +					  RTE_FLOW_ERROR_TYPE_ITEM, item,
> +					  "wrong values for NVGRE");
Not necessary to check the spec because the following
mlx5_flow_item_acceptable only accept matching on .tni field.
Since there is no meaning allowing the user to match on .protocol
and .c_k_s_rsvd0_ver.
What do you think?

> +	if (!mask)
> +		mask = &rte_flow_item_nvgre_mask;
> +	ret = mlx5_flow_item_acceptable
> +		(item, (const uint8_t *)mask,
> +		 (const uint8_t *)&rte_flow_item_nvgre_mask,
> +		 sizeof(struct rte_flow_item_nvgre), error);
> +	if (ret < 0)
> +		return ret;
> +	return 0;
> +}
> +
>  static int
>  flow_null_validate(struct rte_eth_dev *dev __rte_unused,
>  		   const struct rte_flow_attr *attr __rte_unused,
> diff --git a/drivers/net/mlx5/mlx5_flow.h b/drivers/net/mlx5/mlx5_flow.h
> index 3f96bec..24da74b 100644
> --- a/drivers/net/mlx5/mlx5_flow.h
> +++ b/drivers/net/mlx5/mlx5_flow.h
> @@ -48,6 +48,7 @@
>  #define MLX5_FLOW_LAYER_VXLAN_GPE (1u << 13)
>  #define MLX5_FLOW_LAYER_GRE (1u << 14)
>  #define MLX5_FLOW_LAYER_MPLS (1u << 15)
> +/* List of tunnel Layer bits continued below. */
>  
>  /* General pattern items bits. */
>  #define MLX5_FLOW_ITEM_METADATA (1u << 16)
> @@ -58,8 +59,10 @@
>  #define MLX5_FLOW_LAYER_ICMP6 (1u << 19)
>  #define MLX5_FLOW_LAYER_GRE_KEY (1u << 20)
>  
> +/* Pattern tunnel Layer bits (continued). */
>  #define MLX5_FLOW_LAYER_IPIP (1u << 21)
>  #define MLX5_FLOW_LAYER_IPV6_ENCAP (1u << 22)
> +#define MLX5_FLOW_LAYER_NVGRE (1u << 23)
>  
>  /* Outer Masks. */
>  #define MLX5_FLOW_LAYER_OUTER_L3 \
> @@ -79,7 +82,7 @@
>  /* Tunnel Masks. */
>  #define MLX5_FLOW_LAYER_TUNNEL \
>  	(MLX5_FLOW_LAYER_VXLAN | MLX5_FLOW_LAYER_VXLAN_GPE | \
> -	 MLX5_FLOW_LAYER_GRE | MLX5_FLOW_LAYER_MPLS | \
> +	 MLX5_FLOW_LAYER_GRE | MLX5_FLOW_LAYER_NVGRE | MLX5_FLOW_LAYER_MPLS | \
>  	 MLX5_FLOW_LAYER_IPIP | MLX5_FLOW_LAYER_IPV6_ENCAP)
>  
>  /* Inner Masks. */
> @@ -518,5 +521,8 @@ int mlx5_flow_validate_item_icmp6(const struct rte_flow_item *item,
>  				   uint64_t item_flags,
>  				   uint8_t target_protocol,
>  				   struct rte_flow_error *error);
> -
> +int mlx5_flow_validate_item_nvgre(const struct rte_flow_item *item,
> +				  uint64_t item_flags,
> +				  uint8_t target_protocol,
> +				  struct rte_flow_error *error);
>  #endif /* RTE_PMD_MLX5_FLOW_H_ */
> diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
> index 7240d3b..ab758d4 100644
> --- a/drivers/net/mlx5/mlx5_flow_dv.c
> +++ b/drivers/net/mlx5/mlx5_flow_dv.c
> @@ -2966,7 +2966,6 @@ struct field_modify_info modify_tcp[] = {
>  					     MLX5_FLOW_LAYER_OUTER_L4_UDP;
>  			break;
>  		case RTE_FLOW_ITEM_TYPE_GRE:
> -		case RTE_FLOW_ITEM_TYPE_NVGRE:
>  			ret = mlx5_flow_validate_item_gre(items, item_flags,
>  							  next_protocol, error);
>  			if (ret < 0)
> @@ -2974,6 +2973,14 @@ struct field_modify_info modify_tcp[] = {
>  			gre_item = items;
>  			last_item = MLX5_FLOW_LAYER_GRE;
>  			break;
> +		case RTE_FLOW_ITEM_TYPE_NVGRE:
> +			ret = mlx5_flow_validate_item_nvgre(items, item_flags,
> +							    next_protocol,
> +							    error);
> +			if (ret < 0)
> +				return ret;
> +			last_item = MLX5_FLOW_LAYER_NVGRE;
> +			break;
>  		case RTE_FLOW_ITEM_TYPE_GRE_KEY:
>  			ret = mlx5_flow_validate_item_gre_key
>  				(items, item_flags, gre_item, error);
> @@ -3919,7 +3926,21 @@ struct field_modify_info modify_tcp[] = {
>  	int size;
>  	int i;
>  
> -	flow_dv_translate_item_gre(matcher, key, item, inner);
> +	/* For NVGRE, GRE header fields must be set with defined values. */
> +	const struct rte_flow_item_gre gre_spec = {
> +		.c_rsvd0_ver = RTE_BE16(0x2000),
> +		.protocol = RTE_BE16(RTE_ETHER_TYPE_TEB)
> +	};
> +	const struct rte_flow_item_gre gre_mask = {
> +		.c_rsvd0_ver = RTE_BE16(UINT16_MAX),
Well, it should be `RTE_BE16(0xB000)`, which, I think, is more explicit.
Because our NIC only support matching on C,K,S bits, not else bits in
c_rsvd0_ver. Our PMD just ignore the other bits. 

> +		.protocol = RTE_BE16(UINT16_MAX),
> +	};
> +	const struct rte_flow_item gre_item = {
> +		.spec = &gre_spec,
> +		.mask = &gre_mask,
> +		.last = NULL,
> +	};
> +	flow_dv_translate_item_gre(matcher, key, &gre_item, inner);
>  	if (!nvgre_v)
>  		return;
>  	if (!nvgre_m)
> diff --git a/drivers/net/mlx5/mlx5_rxtx.h b/drivers/net/mlx5/mlx5_rxtx.h
> index dfa79e2..d732757 100644
> --- a/drivers/net/mlx5/mlx5_rxtx.h
> +++ b/drivers/net/mlx5/mlx5_rxtx.h
> @@ -40,7 +40,7 @@
>  #include "mlx5_glue.h"
>  
>  /* Support tunnel matching. */
> -#define MLX5_FLOW_TUNNEL 5
> +#define MLX5_FLOW_TUNNEL 6
>  
>  struct mlx5_rxq_stats {
>  #ifdef MLX5_PMD_SOFT_COUNTERS
> -- 
> 1.8.3.1
>
Dekel Peled July 22, 2019, 11:33 a.m. | #2
Thanks, PSB.

> -----Original Message-----
> From: Jack Min
> Sent: Monday, July 22, 2019 12:31 PM
> To: Dekel Peled <dekelp@mellanox.com>
> Cc: Yongseok Koh <yskoh@mellanox.com>; Slava Ovsiienko
> <viacheslavo@mellanox.com>; Shahaf Shuler <shahafs@mellanox.com>; Ori
> Kam <orika@mellanox.com>; dev@dpdk.org
> Subject: Re: [PATCH] net/mlx5: fix NVGRE matching
> 
> On Thu, 19-07-18, 22:42, Dekel Peled wrote:
> > NVGRE has a GRE header with c_rsvd0_ver value 0x2000 and protocol
> > value 0x6558.
> > These should be matched when item_nvgre is provided.
> >
> > This patch adds validation function of NVGRE item, to validate that
> > the input values, if exist, are as required.
> > It also updates the translate function of NVGRE item, to add the
> > required values, if they were not specified.
> >
> > Original work by Xiaoyu Min <jackmin@mellanox.com>
> >
> > Fixes: fc2c498ccb94 ("net/mlx5: add Direct Verbs translate items")
> > Signed-off-by: Dekel Peled <dekelp@mellanox.com>
> > ---
> >  drivers/net/mlx5/mlx5_flow.c    | 69
> +++++++++++++++++++++++++++++++++++++++++
> >  drivers/net/mlx5/mlx5_flow.h    | 10 ++++--
> >  drivers/net/mlx5/mlx5_flow_dv.c | 25 +++++++++++++--
> >  drivers/net/mlx5/mlx5_rxtx.h    |  2 +-
> >  4 files changed, 101 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/net/mlx5/mlx5_flow.c
> > b/drivers/net/mlx5/mlx5_flow.c index e082cbb..6aca4d6 100644
> > --- a/drivers/net/mlx5/mlx5_flow.c
> > +++ b/drivers/net/mlx5/mlx5_flow.c
> > @@ -298,6 +298,10 @@ struct mlx5_flow_tunnel_info {
> >  		.tunnel = MLX5_FLOW_LAYER_MPLS,
> >  		.ptype = RTE_PTYPE_TUNNEL_MPLS_IN_GRE,
> >  	},
> > +	{
> > +		.tunnel = MLX5_FLOW_LAYER_NVGRE,
> > +		.ptype = RTE_PTYPE_TUNNEL_NVGRE,
> > +	},
> >  };
> >
> >  /**
> > @@ -1323,6 +1327,11 @@ uint32_t mlx5_flow_adjust_priority(struct
> rte_eth_dev *dev, int32_t priority,
> >  		return rte_flow_error_set(error, EINVAL,
> >  					  RTE_FLOW_ERROR_TYPE_ITEM,
> item,
> >  					  "L3 cannot follow an L4 layer.");
> > +	else if ((item_flags & MLX5_FLOW_LAYER_NVGRE) &&
> > +		  !(item_flags & MLX5_FLOW_LAYER_INNER_L2))
> > +		return rte_flow_error_set(error, EINVAL,
> > +					  RTE_FLOW_ERROR_TYPE_ITEM,
> item,
> > +					  "L3 cannot follow an NVGRE layer.");
> >  	if (!mask)
> >  		mask = &rte_flow_item_ipv4_mask;
> >  	else if (mask->hdr.next_proto_id != 0 && @@ -1409,6 +1418,11 @@
> > uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t
> priority,
> >  		return rte_flow_error_set(error, EINVAL,
> >  					  RTE_FLOW_ERROR_TYPE_ITEM,
> item,
> >  					  "L3 cannot follow an L4 layer.");
> > +	else if ((item_flags & MLX5_FLOW_LAYER_NVGRE) &&
> > +		  !(item_flags & MLX5_FLOW_LAYER_INNER_L2))
> > +		return rte_flow_error_set(error, EINVAL,
> > +					  RTE_FLOW_ERROR_TYPE_ITEM,
> item,
> > +					  "L3 cannot follow an NVGRE layer.");
> >  	if (!mask)
> >  		mask = &rte_flow_item_ipv6_mask;
> >  	ret = mlx5_flow_item_acceptable(item, (const uint8_t *)mask, @@
> > -1887,6 +1901,61 @@ uint32_t mlx5_flow_adjust_priority(struct
> rte_eth_dev *dev, int32_t priority,
> >  				  " update.");
> >  }
> >
> > +/**
> > + * Validate NVGRE item.
> > + *
> > + * @param[in] item
> > + *   Item specification.
> > + * @param[in] item_flags
> > + *   Bit flags to mark detected items.
> > + * @param[in] target_protocol
> > + *   The next protocol in the previous item.
> > + * @param[out] error
> > + *   Pointer to error structure.
> > + *
> > + * @return
> > + *   0 on success, a negative errno value otherwise and rte_errno is set.
> > + */
> > +int
> > +mlx5_flow_validate_item_nvgre(const struct rte_flow_item *item,
> > +			      uint64_t item_flags,
> > +			      uint8_t target_protocol,
> > +			      struct rte_flow_error *error) {
> > +	const struct rte_flow_item_nvgre *mask = item->mask;
> > +	const struct rte_flow_item_nvgre *spec = item->spec;
> > +	int ret;
> > +
> > +	if (target_protocol != 0xff && target_protocol != IPPROTO_GRE)
> > +		return rte_flow_error_set(error, EINVAL,
> > +					  RTE_FLOW_ERROR_TYPE_ITEM,
> item,
> > +					  "protocol filtering not compatible"
> > +					  " with this GRE layer");
> > +	if (item_flags & MLX5_FLOW_LAYER_TUNNEL)
> > +		return rte_flow_error_set(error, ENOTSUP,
> > +					  RTE_FLOW_ERROR_TYPE_ITEM,
> item,
> > +					  "multiple tunnel layers not"
> > +					  " supported");
> > +	if (!(item_flags & MLX5_FLOW_LAYER_OUTER_L3))
> > +		return rte_flow_error_set(error, ENOTSUP,
> > +					  RTE_FLOW_ERROR_TYPE_ITEM,
> item,
> > +					  "L3 Layer is missing");
> > +	if (spec && (spec->protocol != RTE_BE16(RTE_ETHER_TYPE_TEB) ||
> > +		     spec->c_k_s_rsvd0_ver != RTE_BE16(0x2000)))
> > +		return rte_flow_error_set(error, EINVAL,
> > +					  RTE_FLOW_ERROR_TYPE_ITEM,
> item,
> > +					  "wrong values for NVGRE");
> Not necessary to check the spec because the following
> mlx5_flow_item_acceptable only accept matching on .tni field.
> Since there is no meaning allowing the user to match on .protocol and
> .c_k_s_rsvd0_ver.
> What do you think?

I think it is safer to verify that application doesn't insert invalid values.
It covers any future pmd or applications change.

> 
> > +	if (!mask)
> > +		mask = &rte_flow_item_nvgre_mask;
> > +	ret = mlx5_flow_item_acceptable
> > +		(item, (const uint8_t *)mask,
> > +		 (const uint8_t *)&rte_flow_item_nvgre_mask,
> > +		 sizeof(struct rte_flow_item_nvgre), error);
> > +	if (ret < 0)
> > +		return ret;
> > +	return 0;
> > +}
> > +
> >  static int
> >  flow_null_validate(struct rte_eth_dev *dev __rte_unused,
> >  		   const struct rte_flow_attr *attr __rte_unused, diff --git
> > a/drivers/net/mlx5/mlx5_flow.h b/drivers/net/mlx5/mlx5_flow.h index
> > 3f96bec..24da74b 100644
> > --- a/drivers/net/mlx5/mlx5_flow.h
> > +++ b/drivers/net/mlx5/mlx5_flow.h
> > @@ -48,6 +48,7 @@
> >  #define MLX5_FLOW_LAYER_VXLAN_GPE (1u << 13)  #define
> > MLX5_FLOW_LAYER_GRE (1u << 14)  #define MLX5_FLOW_LAYER_MPLS
> (1u <<
> > 15)
> > +/* List of tunnel Layer bits continued below. */
> >
> >  /* General pattern items bits. */
> >  #define MLX5_FLOW_ITEM_METADATA (1u << 16) @@ -58,8 +59,10 @@
> > #define MLX5_FLOW_LAYER_ICMP6 (1u << 19)  #define
> > MLX5_FLOW_LAYER_GRE_KEY (1u << 20)
> >
> > +/* Pattern tunnel Layer bits (continued). */
> >  #define MLX5_FLOW_LAYER_IPIP (1u << 21)  #define
> > MLX5_FLOW_LAYER_IPV6_ENCAP (1u << 22)
> > +#define MLX5_FLOW_LAYER_NVGRE (1u << 23)
> >
> >  /* Outer Masks. */
> >  #define MLX5_FLOW_LAYER_OUTER_L3 \
> > @@ -79,7 +82,7 @@
> >  /* Tunnel Masks. */
> >  #define MLX5_FLOW_LAYER_TUNNEL \
> >  	(MLX5_FLOW_LAYER_VXLAN | MLX5_FLOW_LAYER_VXLAN_GPE | \
> > -	 MLX5_FLOW_LAYER_GRE | MLX5_FLOW_LAYER_MPLS | \
> > +	 MLX5_FLOW_LAYER_GRE | MLX5_FLOW_LAYER_NVGRE |
> MLX5_FLOW_LAYER_MPLS
> > +| \
> >  	 MLX5_FLOW_LAYER_IPIP | MLX5_FLOW_LAYER_IPV6_ENCAP)
> >
> >  /* Inner Masks. */
> > @@ -518,5 +521,8 @@ int mlx5_flow_validate_item_icmp6(const struct
> rte_flow_item *item,
> >  				   uint64_t item_flags,
> >  				   uint8_t target_protocol,
> >  				   struct rte_flow_error *error);
> > -
> > +int mlx5_flow_validate_item_nvgre(const struct rte_flow_item *item,
> > +				  uint64_t item_flags,
> > +				  uint8_t target_protocol,
> > +				  struct rte_flow_error *error);
> >  #endif /* RTE_PMD_MLX5_FLOW_H_ */
> > diff --git a/drivers/net/mlx5/mlx5_flow_dv.c
> > b/drivers/net/mlx5/mlx5_flow_dv.c index 7240d3b..ab758d4 100644
> > --- a/drivers/net/mlx5/mlx5_flow_dv.c
> > +++ b/drivers/net/mlx5/mlx5_flow_dv.c
> > @@ -2966,7 +2966,6 @@ struct field_modify_info modify_tcp[] = {
> >
> MLX5_FLOW_LAYER_OUTER_L4_UDP;
> >  			break;
> >  		case RTE_FLOW_ITEM_TYPE_GRE:
> > -		case RTE_FLOW_ITEM_TYPE_NVGRE:
> >  			ret = mlx5_flow_validate_item_gre(items,
> item_flags,
> >  							  next_protocol,
> error);
> >  			if (ret < 0)
> > @@ -2974,6 +2973,14 @@ struct field_modify_info modify_tcp[] = {
> >  			gre_item = items;
> >  			last_item = MLX5_FLOW_LAYER_GRE;
> >  			break;
> > +		case RTE_FLOW_ITEM_TYPE_NVGRE:
> > +			ret = mlx5_flow_validate_item_nvgre(items,
> item_flags,
> > +							    next_protocol,
> > +							    error);
> > +			if (ret < 0)
> > +				return ret;
> > +			last_item = MLX5_FLOW_LAYER_NVGRE;
> > +			break;
> >  		case RTE_FLOW_ITEM_TYPE_GRE_KEY:
> >  			ret = mlx5_flow_validate_item_gre_key
> >  				(items, item_flags, gre_item, error); @@ -
> 3919,7 +3926,21 @@
> > struct field_modify_info modify_tcp[] = {
> >  	int size;
> >  	int i;
> >
> > -	flow_dv_translate_item_gre(matcher, key, item, inner);
> > +	/* For NVGRE, GRE header fields must be set with defined values. */
> > +	const struct rte_flow_item_gre gre_spec = {
> > +		.c_rsvd0_ver = RTE_BE16(0x2000),
> > +		.protocol = RTE_BE16(RTE_ETHER_TYPE_TEB)
> > +	};
> > +	const struct rte_flow_item_gre gre_mask = {
> > +		.c_rsvd0_ver = RTE_BE16(UINT16_MAX),
> Well, it should be `RTE_BE16(0xB000)`, which, I think, is more explicit.
> Because our NIC only support matching on C,K,S bits, not else bits in
> c_rsvd0_ver. Our PMD just ignore the other bits.

The spec is specific 0x2000 and with full 0xffff mask to make sure all bits are covered.

> 
> > +		.protocol = RTE_BE16(UINT16_MAX),
> > +	};
> > +	const struct rte_flow_item gre_item = {
> > +		.spec = &gre_spec,
> > +		.mask = &gre_mask,
> > +		.last = NULL,
> > +	};
> > +	flow_dv_translate_item_gre(matcher, key, &gre_item, inner);
> >  	if (!nvgre_v)
> >  		return;
> >  	if (!nvgre_m)
> > diff --git a/drivers/net/mlx5/mlx5_rxtx.h
> > b/drivers/net/mlx5/mlx5_rxtx.h index dfa79e2..d732757 100644
> > --- a/drivers/net/mlx5/mlx5_rxtx.h
> > +++ b/drivers/net/mlx5/mlx5_rxtx.h
> > @@ -40,7 +40,7 @@
> >  #include "mlx5_glue.h"
> >
> >  /* Support tunnel matching. */
> > -#define MLX5_FLOW_TUNNEL 5
> > +#define MLX5_FLOW_TUNNEL 6
> >
> >  struct mlx5_rxq_stats {
> >  #ifdef MLX5_PMD_SOFT_COUNTERS
> > --
> > 1.8.3.1
> >
Xiaoyu Min July 22, 2019, 12:09 p.m. | #3
On Mon, 19-07-22, 19:33, Dekel Peled wrote:
> Thanks, PSB.
> 
> > -----Original Message-----
> > From: Jack Min
> > Sent: Monday, July 22, 2019 12:31 PM
> > To: Dekel Peled <dekelp@mellanox.com>
> > Cc: Yongseok Koh <yskoh@mellanox.com>; Slava Ovsiienko
> > <viacheslavo@mellanox.com>; Shahaf Shuler <shahafs@mellanox.com>; Ori
> > Kam <orika@mellanox.com>; dev@dpdk.org
> > Subject: Re: [PATCH] net/mlx5: fix NVGRE matching
> > 
> > On Thu, 19-07-18, 22:42, Dekel Peled wrote:
> > > NVGRE has a GRE header with c_rsvd0_ver value 0x2000 and protocol
> > > value 0x6558.
> > > These should be matched when item_nvgre is provided.
> > >
> > > This patch adds validation function of NVGRE item, to validate that
> > > the input values, if exist, are as required.
> > > It also updates the translate function of NVGRE item, to add the
> > > required values, if they were not specified.
> > >
> > > Original work by Xiaoyu Min <jackmin@mellanox.com>
> > >
> > > Fixes: fc2c498ccb94 ("net/mlx5: add Direct Verbs translate items")
> > > Signed-off-by: Dekel Peled <dekelp@mellanox.com>
> > > ---
> > >  drivers/net/mlx5/mlx5_flow.c    | 69
> > +++++++++++++++++++++++++++++++++++++++++
> > >  drivers/net/mlx5/mlx5_flow.h    | 10 ++++--
> > >  drivers/net/mlx5/mlx5_flow_dv.c | 25 +++++++++++++--
> > >  drivers/net/mlx5/mlx5_rxtx.h    |  2 +-
> > >  4 files changed, 101 insertions(+), 5 deletions(-)
> > >
> > > diff --git a/drivers/net/mlx5/mlx5_flow.c
> > > b/drivers/net/mlx5/mlx5_flow.c index e082cbb..6aca4d6 100644
> > > --- a/drivers/net/mlx5/mlx5_flow.c
> > > +++ b/drivers/net/mlx5/mlx5_flow.c
> > > @@ -298,6 +298,10 @@ struct mlx5_flow_tunnel_info {
> > >  		.tunnel = MLX5_FLOW_LAYER_MPLS,
> > >  		.ptype = RTE_PTYPE_TUNNEL_MPLS_IN_GRE,
> > >  	},
> > > +	{
> > > +		.tunnel = MLX5_FLOW_LAYER_NVGRE,
> > > +		.ptype = RTE_PTYPE_TUNNEL_NVGRE,
> > > +	},
> > >  };
> > >
> > >  /**
> > > @@ -1323,6 +1327,11 @@ uint32_t mlx5_flow_adjust_priority(struct
> > rte_eth_dev *dev, int32_t priority,
> > >  		return rte_flow_error_set(error, EINVAL,
> > >  					  RTE_FLOW_ERROR_TYPE_ITEM,
> > item,
> > >  					  "L3 cannot follow an L4 layer.");
> > > +	else if ((item_flags & MLX5_FLOW_LAYER_NVGRE) &&
> > > +		  !(item_flags & MLX5_FLOW_LAYER_INNER_L2))
> > > +		return rte_flow_error_set(error, EINVAL,
> > > +					  RTE_FLOW_ERROR_TYPE_ITEM,
> > item,
> > > +					  "L3 cannot follow an NVGRE layer.");
> > >  	if (!mask)
> > >  		mask = &rte_flow_item_ipv4_mask;
> > >  	else if (mask->hdr.next_proto_id != 0 && @@ -1409,6 +1418,11 @@
> > > uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t
> > priority,
> > >  		return rte_flow_error_set(error, EINVAL,
> > >  					  RTE_FLOW_ERROR_TYPE_ITEM,
> > item,
> > >  					  "L3 cannot follow an L4 layer.");
> > > +	else if ((item_flags & MLX5_FLOW_LAYER_NVGRE) &&
> > > +		  !(item_flags & MLX5_FLOW_LAYER_INNER_L2))
> > > +		return rte_flow_error_set(error, EINVAL,
> > > +					  RTE_FLOW_ERROR_TYPE_ITEM,
> > item,
> > > +					  "L3 cannot follow an NVGRE layer.");
> > >  	if (!mask)
> > >  		mask = &rte_flow_item_ipv6_mask;
> > >  	ret = mlx5_flow_item_acceptable(item, (const uint8_t *)mask, @@
> > > -1887,6 +1901,61 @@ uint32_t mlx5_flow_adjust_priority(struct
> > rte_eth_dev *dev, int32_t priority,
> > >  				  " update.");
> > >  }
> > >
> > > +/**
> > > + * Validate NVGRE item.
> > > + *
> > > + * @param[in] item
> > > + *   Item specification.
> > > + * @param[in] item_flags
> > > + *   Bit flags to mark detected items.
> > > + * @param[in] target_protocol
> > > + *   The next protocol in the previous item.
> > > + * @param[out] error
> > > + *   Pointer to error structure.
> > > + *
> > > + * @return
> > > + *   0 on success, a negative errno value otherwise and rte_errno is set.
> > > + */
> > > +int
> > > +mlx5_flow_validate_item_nvgre(const struct rte_flow_item *item,
> > > +			      uint64_t item_flags,
> > > +			      uint8_t target_protocol,
> > > +			      struct rte_flow_error *error) {
> > > +	const struct rte_flow_item_nvgre *mask = item->mask;
> > > +	const struct rte_flow_item_nvgre *spec = item->spec;
> > > +	int ret;
> > > +
> > > +	if (target_protocol != 0xff && target_protocol != IPPROTO_GRE)
> > > +		return rte_flow_error_set(error, EINVAL,
> > > +					  RTE_FLOW_ERROR_TYPE_ITEM,
> > item,
> > > +					  "protocol filtering not compatible"
> > > +					  " with this GRE layer");
> > > +	if (item_flags & MLX5_FLOW_LAYER_TUNNEL)
> > > +		return rte_flow_error_set(error, ENOTSUP,
> > > +					  RTE_FLOW_ERROR_TYPE_ITEM,
> > item,
> > > +					  "multiple tunnel layers not"
> > > +					  " supported");
> > > +	if (!(item_flags & MLX5_FLOW_LAYER_OUTER_L3))
> > > +		return rte_flow_error_set(error, ENOTSUP,
> > > +					  RTE_FLOW_ERROR_TYPE_ITEM,
> > item,
> > > +					  "L3 Layer is missing");
> > > +	if (spec && (spec->protocol != RTE_BE16(RTE_ETHER_TYPE_TEB) ||
> > > +		     spec->c_k_s_rsvd0_ver != RTE_BE16(0x2000)))
> > > +		return rte_flow_error_set(error, EINVAL,
> > > +					  RTE_FLOW_ERROR_TYPE_ITEM,
> > item,
> > > +					  "wrong values for NVGRE");
> > Not necessary to check the spec because the following
> > mlx5_flow_item_acceptable only accept matching on .tni field.
> > Since there is no meaning allowing the user to match on .protocol and
> > .c_k_s_rsvd0_ver.
> > What do you think?
> 
> I think it is safer to verify that application doesn't insert invalid values.
> It covers any future pmd or applications change.
If the mask is not enabled for .protocol and c_k_s_rsvd0_ver, whatever
the spec value is, it doesn't matter, right?

> 
> > 
> > > +	if (!mask)
> > > +		mask = &rte_flow_item_nvgre_mask;
> > > +	ret = mlx5_flow_item_acceptable
> > > +		(item, (const uint8_t *)mask,
> > > +		 (const uint8_t *)&rte_flow_item_nvgre_mask,
> > > +		 sizeof(struct rte_flow_item_nvgre), error);
> > > +	if (ret < 0)
> > > +		return ret;
> > > +	return 0;
> > > +}
> > > +
> > >  static int
> > >  flow_null_validate(struct rte_eth_dev *dev __rte_unused,
> > >  		   const struct rte_flow_attr *attr __rte_unused, diff --git
> > > a/drivers/net/mlx5/mlx5_flow.h b/drivers/net/mlx5/mlx5_flow.h index
> > > 3f96bec..24da74b 100644
> > > --- a/drivers/net/mlx5/mlx5_flow.h
> > > +++ b/drivers/net/mlx5/mlx5_flow.h
> > > @@ -48,6 +48,7 @@
> > >  #define MLX5_FLOW_LAYER_VXLAN_GPE (1u << 13)  #define
> > > MLX5_FLOW_LAYER_GRE (1u << 14)  #define MLX5_FLOW_LAYER_MPLS
> > (1u <<
> > > 15)
> > > +/* List of tunnel Layer bits continued below. */
> > >
> > >  /* General pattern items bits. */
> > >  #define MLX5_FLOW_ITEM_METADATA (1u << 16) @@ -58,8 +59,10 @@
> > > #define MLX5_FLOW_LAYER_ICMP6 (1u << 19)  #define
> > > MLX5_FLOW_LAYER_GRE_KEY (1u << 20)
> > >
> > > +/* Pattern tunnel Layer bits (continued). */
> > >  #define MLX5_FLOW_LAYER_IPIP (1u << 21)  #define
> > > MLX5_FLOW_LAYER_IPV6_ENCAP (1u << 22)
> > > +#define MLX5_FLOW_LAYER_NVGRE (1u << 23)
> > >
> > >  /* Outer Masks. */
> > >  #define MLX5_FLOW_LAYER_OUTER_L3 \
> > > @@ -79,7 +82,7 @@
> > >  /* Tunnel Masks. */
> > >  #define MLX5_FLOW_LAYER_TUNNEL \
> > >  	(MLX5_FLOW_LAYER_VXLAN | MLX5_FLOW_LAYER_VXLAN_GPE | \
> > > -	 MLX5_FLOW_LAYER_GRE | MLX5_FLOW_LAYER_MPLS | \
> > > +	 MLX5_FLOW_LAYER_GRE | MLX5_FLOW_LAYER_NVGRE |
> > MLX5_FLOW_LAYER_MPLS
> > > +| \
> > >  	 MLX5_FLOW_LAYER_IPIP | MLX5_FLOW_LAYER_IPV6_ENCAP)
> > >
> > >  /* Inner Masks. */
> > > @@ -518,5 +521,8 @@ int mlx5_flow_validate_item_icmp6(const struct
> > rte_flow_item *item,
> > >  				   uint64_t item_flags,
> > >  				   uint8_t target_protocol,
> > >  				   struct rte_flow_error *error);
> > > -
> > > +int mlx5_flow_validate_item_nvgre(const struct rte_flow_item *item,
> > > +				  uint64_t item_flags,
> > > +				  uint8_t target_protocol,
> > > +				  struct rte_flow_error *error);
> > >  #endif /* RTE_PMD_MLX5_FLOW_H_ */
> > > diff --git a/drivers/net/mlx5/mlx5_flow_dv.c
> > > b/drivers/net/mlx5/mlx5_flow_dv.c index 7240d3b..ab758d4 100644
> > > --- a/drivers/net/mlx5/mlx5_flow_dv.c
> > > +++ b/drivers/net/mlx5/mlx5_flow_dv.c
> > > @@ -2966,7 +2966,6 @@ struct field_modify_info modify_tcp[] = {
> > >
> > MLX5_FLOW_LAYER_OUTER_L4_UDP;
> > >  			break;
> > >  		case RTE_FLOW_ITEM_TYPE_GRE:
> > > -		case RTE_FLOW_ITEM_TYPE_NVGRE:
> > >  			ret = mlx5_flow_validate_item_gre(items,
> > item_flags,
> > >  							  next_protocol,
> > error);
> > >  			if (ret < 0)
> > > @@ -2974,6 +2973,14 @@ struct field_modify_info modify_tcp[] = {
> > >  			gre_item = items;
> > >  			last_item = MLX5_FLOW_LAYER_GRE;
> > >  			break;
> > > +		case RTE_FLOW_ITEM_TYPE_NVGRE:
> > > +			ret = mlx5_flow_validate_item_nvgre(items,
> > item_flags,
> > > +							    next_protocol,
> > > +							    error);
> > > +			if (ret < 0)
> > > +				return ret;
> > > +			last_item = MLX5_FLOW_LAYER_NVGRE;
> > > +			break;
> > >  		case RTE_FLOW_ITEM_TYPE_GRE_KEY:
> > >  			ret = mlx5_flow_validate_item_gre_key
> > >  				(items, item_flags, gre_item, error); @@ -
> > 3919,7 +3926,21 @@
> > > struct field_modify_info modify_tcp[] = {
> > >  	int size;
> > >  	int i;
> > >
> > > -	flow_dv_translate_item_gre(matcher, key, item, inner);
> > > +	/* For NVGRE, GRE header fields must be set with defined values. */
> > > +	const struct rte_flow_item_gre gre_spec = {
> > > +		.c_rsvd0_ver = RTE_BE16(0x2000),
> > > +		.protocol = RTE_BE16(RTE_ETHER_TYPE_TEB)
> > > +	};
> > > +	const struct rte_flow_item_gre gre_mask = {
> > > +		.c_rsvd0_ver = RTE_BE16(UINT16_MAX),
> > Well, it should be `RTE_BE16(0xB000)`, which, I think, is more explicit.
> > Because our NIC only support matching on C,K,S bits, not else bits in
> > c_rsvd0_ver. Our PMD just ignore the other bits.
> 
> The spec is specific 0x2000 and with full 0xffff mask to make sure all bits are covered.
I see. You wanna make sure that all bits are covered but what I wanna
point out is our PMD only match C,K,S bits and ignore others.
So, even though the spec/mask is 0x2000/0xffff, it still will match on 0x2001, for
example.

> 
> > 
> > > +		.protocol = RTE_BE16(UINT16_MAX),
> > > +	};
> > > +	const struct rte_flow_item gre_item = {
> > > +		.spec = &gre_spec,
> > > +		.mask = &gre_mask,
> > > +		.last = NULL,
> > > +	};
> > > +	flow_dv_translate_item_gre(matcher, key, &gre_item, inner);
> > >  	if (!nvgre_v)
> > >  		return;
> > >  	if (!nvgre_m)
> > > diff --git a/drivers/net/mlx5/mlx5_rxtx.h
> > > b/drivers/net/mlx5/mlx5_rxtx.h index dfa79e2..d732757 100644
> > > --- a/drivers/net/mlx5/mlx5_rxtx.h
> > > +++ b/drivers/net/mlx5/mlx5_rxtx.h
> > > @@ -40,7 +40,7 @@
> > >  #include "mlx5_glue.h"
> > >
> > >  /* Support tunnel matching. */
> > > -#define MLX5_FLOW_TUNNEL 5
> > > +#define MLX5_FLOW_TUNNEL 6
> > >
> > >  struct mlx5_rxq_stats {
> > >  #ifdef MLX5_PMD_SOFT_COUNTERS
> > > --
> > > 1.8.3.1
> > >
Dekel Peled July 22, 2019, 3:38 p.m. | #4
Thanks, sent v2.

> -----Original Message-----
> From: Jack Min
> Sent: Monday, July 22, 2019 3:10 PM
> To: Dekel Peled <dekelp@mellanox.com>
> Cc: Yongseok Koh <yskoh@mellanox.com>; Slava Ovsiienko
> <viacheslavo@mellanox.com>; Shahaf Shuler <shahafs@mellanox.com>; Ori
> Kam <orika@mellanox.com>; dev@dpdk.org
> Subject: Re: [PATCH] net/mlx5: fix NVGRE matching
> 
> On Mon, 19-07-22, 19:33, Dekel Peled wrote:
> > Thanks, PSB.
> >
> > > -----Original Message-----
> > > From: Jack Min
> > > Sent: Monday, July 22, 2019 12:31 PM
> > > To: Dekel Peled <dekelp@mellanox.com>
> > > Cc: Yongseok Koh <yskoh@mellanox.com>; Slava Ovsiienko
> > > <viacheslavo@mellanox.com>; Shahaf Shuler <shahafs@mellanox.com>;
> > > Ori Kam <orika@mellanox.com>; dev@dpdk.org
> > > Subject: Re: [PATCH] net/mlx5: fix NVGRE matching
> > >
> > > On Thu, 19-07-18, 22:42, Dekel Peled wrote:
> > > > NVGRE has a GRE header with c_rsvd0_ver value 0x2000 and protocol
> > > > value 0x6558.
> > > > These should be matched when item_nvgre is provided.
> > > >
> > > > This patch adds validation function of NVGRE item, to validate
> > > > that the input values, if exist, are as required.
> > > > It also updates the translate function of NVGRE item, to add the
> > > > required values, if they were not specified.
> > > >
> > > > Original work by Xiaoyu Min <jackmin@mellanox.com>
> > > >
> > > > Fixes: fc2c498ccb94 ("net/mlx5: add Direct Verbs translate items")
> > > > Signed-off-by: Dekel Peled <dekelp@mellanox.com>
> > > > ---
> > > >  drivers/net/mlx5/mlx5_flow.c    | 69
> > > +++++++++++++++++++++++++++++++++++++++++
> > > >  drivers/net/mlx5/mlx5_flow.h    | 10 ++++--
> > > >  drivers/net/mlx5/mlx5_flow_dv.c | 25 +++++++++++++--
> > > >  drivers/net/mlx5/mlx5_rxtx.h    |  2 +-
> > > >  4 files changed, 101 insertions(+), 5 deletions(-)
> > > >
> > > > diff --git a/drivers/net/mlx5/mlx5_flow.c
> > > > b/drivers/net/mlx5/mlx5_flow.c index e082cbb..6aca4d6 100644
> > > > --- a/drivers/net/mlx5/mlx5_flow.c
> > > > +++ b/drivers/net/mlx5/mlx5_flow.c
> > > > @@ -298,6 +298,10 @@ struct mlx5_flow_tunnel_info {
> > > >  		.tunnel = MLX5_FLOW_LAYER_MPLS,
> > > >  		.ptype = RTE_PTYPE_TUNNEL_MPLS_IN_GRE,
> > > >  	},
> > > > +	{
> > > > +		.tunnel = MLX5_FLOW_LAYER_NVGRE,
> > > > +		.ptype = RTE_PTYPE_TUNNEL_NVGRE,
> > > > +	},
> > > >  };
> > > >
> > > >  /**
> > > > @@ -1323,6 +1327,11 @@ uint32_t mlx5_flow_adjust_priority(struct
> > > rte_eth_dev *dev, int32_t priority,
> > > >  		return rte_flow_error_set(error, EINVAL,
> > > >  					  RTE_FLOW_ERROR_TYPE_ITEM,
> > > item,
> > > >  					  "L3 cannot follow an L4 layer.");
> > > > +	else if ((item_flags & MLX5_FLOW_LAYER_NVGRE) &&
> > > > +		  !(item_flags & MLX5_FLOW_LAYER_INNER_L2))
> > > > +		return rte_flow_error_set(error, EINVAL,
> > > > +					  RTE_FLOW_ERROR_TYPE_ITEM,
> > > item,
> > > > +					  "L3 cannot follow an NVGRE layer.");
> > > >  	if (!mask)
> > > >  		mask = &rte_flow_item_ipv4_mask;
> > > >  	else if (mask->hdr.next_proto_id != 0 && @@ -1409,6 +1418,11 @@
> > > > uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev,
> > > > int32_t
> > > priority,
> > > >  		return rte_flow_error_set(error, EINVAL,
> > > >  					  RTE_FLOW_ERROR_TYPE_ITEM,
> > > item,
> > > >  					  "L3 cannot follow an L4 layer.");
> > > > +	else if ((item_flags & MLX5_FLOW_LAYER_NVGRE) &&
> > > > +		  !(item_flags & MLX5_FLOW_LAYER_INNER_L2))
> > > > +		return rte_flow_error_set(error, EINVAL,
> > > > +					  RTE_FLOW_ERROR_TYPE_ITEM,
> > > item,
> > > > +					  "L3 cannot follow an NVGRE layer.");
> > > >  	if (!mask)
> > > >  		mask = &rte_flow_item_ipv6_mask;
> > > >  	ret = mlx5_flow_item_acceptable(item, (const uint8_t *)mask, @@
> > > > -1887,6 +1901,61 @@ uint32_t mlx5_flow_adjust_priority(struct
> > > rte_eth_dev *dev, int32_t priority,
> > > >  				  " update.");
> > > >  }
> > > >
> > > > +/**
> > > > + * Validate NVGRE item.
> > > > + *
> > > > + * @param[in] item
> > > > + *   Item specification.
> > > > + * @param[in] item_flags
> > > > + *   Bit flags to mark detected items.
> > > > + * @param[in] target_protocol
> > > > + *   The next protocol in the previous item.
> > > > + * @param[out] error
> > > > + *   Pointer to error structure.
> > > > + *
> > > > + * @return
> > > > + *   0 on success, a negative errno value otherwise and rte_errno is
> set.
> > > > + */
> > > > +int
> > > > +mlx5_flow_validate_item_nvgre(const struct rte_flow_item *item,
> > > > +			      uint64_t item_flags,
> > > > +			      uint8_t target_protocol,
> > > > +			      struct rte_flow_error *error) {
> > > > +	const struct rte_flow_item_nvgre *mask = item->mask;
> > > > +	const struct rte_flow_item_nvgre *spec = item->spec;
> > > > +	int ret;
> > > > +
> > > > +	if (target_protocol != 0xff && target_protocol != IPPROTO_GRE)
> > > > +		return rte_flow_error_set(error, EINVAL,
> > > > +					  RTE_FLOW_ERROR_TYPE_ITEM,
> > > item,
> > > > +					  "protocol filtering not compatible"
> > > > +					  " with this GRE layer");
> > > > +	if (item_flags & MLX5_FLOW_LAYER_TUNNEL)
> > > > +		return rte_flow_error_set(error, ENOTSUP,
> > > > +					  RTE_FLOW_ERROR_TYPE_ITEM,
> > > item,
> > > > +					  "multiple tunnel layers not"
> > > > +					  " supported");
> > > > +	if (!(item_flags & MLX5_FLOW_LAYER_OUTER_L3))
> > > > +		return rte_flow_error_set(error, ENOTSUP,
> > > > +					  RTE_FLOW_ERROR_TYPE_ITEM,
> > > item,
> > > > +					  "L3 Layer is missing");
> > > > +	if (spec && (spec->protocol != RTE_BE16(RTE_ETHER_TYPE_TEB) ||
> > > > +		     spec->c_k_s_rsvd0_ver != RTE_BE16(0x2000)))
> > > > +		return rte_flow_error_set(error, EINVAL,
> > > > +					  RTE_FLOW_ERROR_TYPE_ITEM,
> > > item,
> > > > +					  "wrong values for NVGRE");
> > > Not necessary to check the spec because the following
> > > mlx5_flow_item_acceptable only accept matching on .tni field.
> > > Since there is no meaning allowing the user to match on .protocol
> > > and .c_k_s_rsvd0_ver.
> > > What do you think?
> >
> > I think it is safer to verify that application doesn't insert invalid values.
> > It covers any future pmd or applications change.
> If the mask is not enabled for .protocol and c_k_s_rsvd0_ver, whatever the
> spec value is, it doesn't matter, right?
> 
> >
> > >
> > > > +	if (!mask)
> > > > +		mask = &rte_flow_item_nvgre_mask;
> > > > +	ret = mlx5_flow_item_acceptable
> > > > +		(item, (const uint8_t *)mask,
> > > > +		 (const uint8_t *)&rte_flow_item_nvgre_mask,
> > > > +		 sizeof(struct rte_flow_item_nvgre), error);
> > > > +	if (ret < 0)
> > > > +		return ret;
> > > > +	return 0;
> > > > +}
> > > > +
> > > >  static int
> > > >  flow_null_validate(struct rte_eth_dev *dev __rte_unused,
> > > >  		   const struct rte_flow_attr *attr __rte_unused, diff --git
> > > > a/drivers/net/mlx5/mlx5_flow.h b/drivers/net/mlx5/mlx5_flow.h
> > > > index 3f96bec..24da74b 100644
> > > > --- a/drivers/net/mlx5/mlx5_flow.h
> > > > +++ b/drivers/net/mlx5/mlx5_flow.h
> > > > @@ -48,6 +48,7 @@
> > > >  #define MLX5_FLOW_LAYER_VXLAN_GPE (1u << 13)  #define
> > > > MLX5_FLOW_LAYER_GRE (1u << 14)  #define
> MLX5_FLOW_LAYER_MPLS
> > > (1u <<
> > > > 15)
> > > > +/* List of tunnel Layer bits continued below. */
> > > >
> > > >  /* General pattern items bits. */  #define
> > > > MLX5_FLOW_ITEM_METADATA (1u << 16) @@ -58,8 +59,10 @@
> #define
> > > > MLX5_FLOW_LAYER_ICMP6 (1u << 19)  #define
> MLX5_FLOW_LAYER_GRE_KEY
> > > > (1u << 20)
> > > >
> > > > +/* Pattern tunnel Layer bits (continued). */
> > > >  #define MLX5_FLOW_LAYER_IPIP (1u << 21)  #define
> > > > MLX5_FLOW_LAYER_IPV6_ENCAP (1u << 22)
> > > > +#define MLX5_FLOW_LAYER_NVGRE (1u << 23)
> > > >
> > > >  /* Outer Masks. */
> > > >  #define MLX5_FLOW_LAYER_OUTER_L3 \ @@ -79,7 +82,7 @@
> > > >  /* Tunnel Masks. */
> > > >  #define MLX5_FLOW_LAYER_TUNNEL \
> > > >  	(MLX5_FLOW_LAYER_VXLAN | MLX5_FLOW_LAYER_VXLAN_GPE | \
> > > > -	 MLX5_FLOW_LAYER_GRE | MLX5_FLOW_LAYER_MPLS | \
> > > > +	 MLX5_FLOW_LAYER_GRE | MLX5_FLOW_LAYER_NVGRE |
> > > MLX5_FLOW_LAYER_MPLS
> > > > +| \
> > > >  	 MLX5_FLOW_LAYER_IPIP | MLX5_FLOW_LAYER_IPV6_ENCAP)
> > > >
> > > >  /* Inner Masks. */
> > > > @@ -518,5 +521,8 @@ int mlx5_flow_validate_item_icmp6(const struct
> > > rte_flow_item *item,
> > > >  				   uint64_t item_flags,
> > > >  				   uint8_t target_protocol,
> > > >  				   struct rte_flow_error *error);
> > > > -
> > > > +int mlx5_flow_validate_item_nvgre(const struct rte_flow_item *item,
> > > > +				  uint64_t item_flags,
> > > > +				  uint8_t target_protocol,
> > > > +				  struct rte_flow_error *error);
> > > >  #endif /* RTE_PMD_MLX5_FLOW_H_ */ diff --git
> > > > a/drivers/net/mlx5/mlx5_flow_dv.c
> > > > b/drivers/net/mlx5/mlx5_flow_dv.c index 7240d3b..ab758d4 100644
> > > > --- a/drivers/net/mlx5/mlx5_flow_dv.c
> > > > +++ b/drivers/net/mlx5/mlx5_flow_dv.c
> > > > @@ -2966,7 +2966,6 @@ struct field_modify_info modify_tcp[] = {
> > > >
> > > MLX5_FLOW_LAYER_OUTER_L4_UDP;
> > > >  			break;
> > > >  		case RTE_FLOW_ITEM_TYPE_GRE:
> > > > -		case RTE_FLOW_ITEM_TYPE_NVGRE:
> > > >  			ret = mlx5_flow_validate_item_gre(items,
> > > item_flags,
> > > >  							  next_protocol,
> > > error);
> > > >  			if (ret < 0)
> > > > @@ -2974,6 +2973,14 @@ struct field_modify_info modify_tcp[] = {
> > > >  			gre_item = items;
> > > >  			last_item = MLX5_FLOW_LAYER_GRE;
> > > >  			break;
> > > > +		case RTE_FLOW_ITEM_TYPE_NVGRE:
> > > > +			ret = mlx5_flow_validate_item_nvgre(items,
> > > item_flags,
> > > > +							    next_protocol,
> > > > +							    error);
> > > > +			if (ret < 0)
> > > > +				return ret;
> > > > +			last_item = MLX5_FLOW_LAYER_NVGRE;
> > > > +			break;
> > > >  		case RTE_FLOW_ITEM_TYPE_GRE_KEY:
> > > >  			ret = mlx5_flow_validate_item_gre_key
> > > >  				(items, item_flags, gre_item, error); @@ -
> > > 3919,7 +3926,21 @@
> > > > struct field_modify_info modify_tcp[] = {
> > > >  	int size;
> > > >  	int i;
> > > >
> > > > -	flow_dv_translate_item_gre(matcher, key, item, inner);
> > > > +	/* For NVGRE, GRE header fields must be set with defined values. */
> > > > +	const struct rte_flow_item_gre gre_spec = {
> > > > +		.c_rsvd0_ver = RTE_BE16(0x2000),
> > > > +		.protocol = RTE_BE16(RTE_ETHER_TYPE_TEB)
> > > > +	};
> > > > +	const struct rte_flow_item_gre gre_mask = {
> > > > +		.c_rsvd0_ver = RTE_BE16(UINT16_MAX),
> > > Well, it should be `RTE_BE16(0xB000)`, which, I think, is more explicit.
> > > Because our NIC only support matching on C,K,S bits, not else bits
> > > in c_rsvd0_ver. Our PMD just ignore the other bits.
> >
> > The spec is specific 0x2000 and with full 0xffff mask to make sure all bits are
> covered.
> I see. You wanna make sure that all bits are covered but what I wanna point
> out is our PMD only match C,K,S bits and ignore others.
> So, even though the spec/mask is 0x2000/0xffff, it still will match on 0x2001,
> for example.
> 
> >
> > >
> > > > +		.protocol = RTE_BE16(UINT16_MAX),
> > > > +	};
> > > > +	const struct rte_flow_item gre_item = {
> > > > +		.spec = &gre_spec,
> > > > +		.mask = &gre_mask,
> > > > +		.last = NULL,
> > > > +	};
> > > > +	flow_dv_translate_item_gre(matcher, key, &gre_item, inner);
> > > >  	if (!nvgre_v)
> > > >  		return;
> > > >  	if (!nvgre_m)
> > > > diff --git a/drivers/net/mlx5/mlx5_rxtx.h
> > > > b/drivers/net/mlx5/mlx5_rxtx.h index dfa79e2..d732757 100644
> > > > --- a/drivers/net/mlx5/mlx5_rxtx.h
> > > > +++ b/drivers/net/mlx5/mlx5_rxtx.h
> > > > @@ -40,7 +40,7 @@
> > > >  #include "mlx5_glue.h"
> > > >
> > > >  /* Support tunnel matching. */
> > > > -#define MLX5_FLOW_TUNNEL 5
> > > > +#define MLX5_FLOW_TUNNEL 6
> > > >
> > > >  struct mlx5_rxq_stats {
> > > >  #ifdef MLX5_PMD_SOFT_COUNTERS
> > > > --
> > > > 1.8.3.1
> > > >

Patch

diff --git a/drivers/net/mlx5/mlx5_flow.c b/drivers/net/mlx5/mlx5_flow.c
index e082cbb..6aca4d6 100644
--- a/drivers/net/mlx5/mlx5_flow.c
+++ b/drivers/net/mlx5/mlx5_flow.c
@@ -298,6 +298,10 @@  struct mlx5_flow_tunnel_info {
 		.tunnel = MLX5_FLOW_LAYER_MPLS,
 		.ptype = RTE_PTYPE_TUNNEL_MPLS_IN_GRE,
 	},
+	{
+		.tunnel = MLX5_FLOW_LAYER_NVGRE,
+		.ptype = RTE_PTYPE_TUNNEL_NVGRE,
+	},
 };
 
 /**
@@ -1323,6 +1327,11 @@  uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
 		return rte_flow_error_set(error, EINVAL,
 					  RTE_FLOW_ERROR_TYPE_ITEM, item,
 					  "L3 cannot follow an L4 layer.");
+	else if ((item_flags & MLX5_FLOW_LAYER_NVGRE) &&
+		  !(item_flags & MLX5_FLOW_LAYER_INNER_L2))
+		return rte_flow_error_set(error, EINVAL,
+					  RTE_FLOW_ERROR_TYPE_ITEM, item,
+					  "L3 cannot follow an NVGRE layer.");
 	if (!mask)
 		mask = &rte_flow_item_ipv4_mask;
 	else if (mask->hdr.next_proto_id != 0 &&
@@ -1409,6 +1418,11 @@  uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
 		return rte_flow_error_set(error, EINVAL,
 					  RTE_FLOW_ERROR_TYPE_ITEM, item,
 					  "L3 cannot follow an L4 layer.");
+	else if ((item_flags & MLX5_FLOW_LAYER_NVGRE) &&
+		  !(item_flags & MLX5_FLOW_LAYER_INNER_L2))
+		return rte_flow_error_set(error, EINVAL,
+					  RTE_FLOW_ERROR_TYPE_ITEM, item,
+					  "L3 cannot follow an NVGRE layer.");
 	if (!mask)
 		mask = &rte_flow_item_ipv6_mask;
 	ret = mlx5_flow_item_acceptable(item, (const uint8_t *)mask,
@@ -1887,6 +1901,61 @@  uint32_t mlx5_flow_adjust_priority(struct rte_eth_dev *dev, int32_t priority,
 				  " update.");
 }
 
+/**
+ * Validate NVGRE item.
+ *
+ * @param[in] item
+ *   Item specification.
+ * @param[in] item_flags
+ *   Bit flags to mark detected items.
+ * @param[in] target_protocol
+ *   The next protocol in the previous item.
+ * @param[out] error
+ *   Pointer to error structure.
+ *
+ * @return
+ *   0 on success, a negative errno value otherwise and rte_errno is set.
+ */
+int
+mlx5_flow_validate_item_nvgre(const struct rte_flow_item *item,
+			      uint64_t item_flags,
+			      uint8_t target_protocol,
+			      struct rte_flow_error *error)
+{
+	const struct rte_flow_item_nvgre *mask = item->mask;
+	const struct rte_flow_item_nvgre *spec = item->spec;
+	int ret;
+
+	if (target_protocol != 0xff && target_protocol != IPPROTO_GRE)
+		return rte_flow_error_set(error, EINVAL,
+					  RTE_FLOW_ERROR_TYPE_ITEM, item,
+					  "protocol filtering not compatible"
+					  " with this GRE layer");
+	if (item_flags & MLX5_FLOW_LAYER_TUNNEL)
+		return rte_flow_error_set(error, ENOTSUP,
+					  RTE_FLOW_ERROR_TYPE_ITEM, item,
+					  "multiple tunnel layers not"
+					  " supported");
+	if (!(item_flags & MLX5_FLOW_LAYER_OUTER_L3))
+		return rte_flow_error_set(error, ENOTSUP,
+					  RTE_FLOW_ERROR_TYPE_ITEM, item,
+					  "L3 Layer is missing");
+	if (spec && (spec->protocol != RTE_BE16(RTE_ETHER_TYPE_TEB) ||
+		     spec->c_k_s_rsvd0_ver != RTE_BE16(0x2000)))
+		return rte_flow_error_set(error, EINVAL,
+					  RTE_FLOW_ERROR_TYPE_ITEM, item,
+					  "wrong values for NVGRE");
+	if (!mask)
+		mask = &rte_flow_item_nvgre_mask;
+	ret = mlx5_flow_item_acceptable
+		(item, (const uint8_t *)mask,
+		 (const uint8_t *)&rte_flow_item_nvgre_mask,
+		 sizeof(struct rte_flow_item_nvgre), error);
+	if (ret < 0)
+		return ret;
+	return 0;
+}
+
 static int
 flow_null_validate(struct rte_eth_dev *dev __rte_unused,
 		   const struct rte_flow_attr *attr __rte_unused,
diff --git a/drivers/net/mlx5/mlx5_flow.h b/drivers/net/mlx5/mlx5_flow.h
index 3f96bec..24da74b 100644
--- a/drivers/net/mlx5/mlx5_flow.h
+++ b/drivers/net/mlx5/mlx5_flow.h
@@ -48,6 +48,7 @@ 
 #define MLX5_FLOW_LAYER_VXLAN_GPE (1u << 13)
 #define MLX5_FLOW_LAYER_GRE (1u << 14)
 #define MLX5_FLOW_LAYER_MPLS (1u << 15)
+/* List of tunnel Layer bits continued below. */
 
 /* General pattern items bits. */
 #define MLX5_FLOW_ITEM_METADATA (1u << 16)
@@ -58,8 +59,10 @@ 
 #define MLX5_FLOW_LAYER_ICMP6 (1u << 19)
 #define MLX5_FLOW_LAYER_GRE_KEY (1u << 20)
 
+/* Pattern tunnel Layer bits (continued). */
 #define MLX5_FLOW_LAYER_IPIP (1u << 21)
 #define MLX5_FLOW_LAYER_IPV6_ENCAP (1u << 22)
+#define MLX5_FLOW_LAYER_NVGRE (1u << 23)
 
 /* Outer Masks. */
 #define MLX5_FLOW_LAYER_OUTER_L3 \
@@ -79,7 +82,7 @@ 
 /* Tunnel Masks. */
 #define MLX5_FLOW_LAYER_TUNNEL \
 	(MLX5_FLOW_LAYER_VXLAN | MLX5_FLOW_LAYER_VXLAN_GPE | \
-	 MLX5_FLOW_LAYER_GRE | MLX5_FLOW_LAYER_MPLS | \
+	 MLX5_FLOW_LAYER_GRE | MLX5_FLOW_LAYER_NVGRE | MLX5_FLOW_LAYER_MPLS | \
 	 MLX5_FLOW_LAYER_IPIP | MLX5_FLOW_LAYER_IPV6_ENCAP)
 
 /* Inner Masks. */
@@ -518,5 +521,8 @@  int mlx5_flow_validate_item_icmp6(const struct rte_flow_item *item,
 				   uint64_t item_flags,
 				   uint8_t target_protocol,
 				   struct rte_flow_error *error);
-
+int mlx5_flow_validate_item_nvgre(const struct rte_flow_item *item,
+				  uint64_t item_flags,
+				  uint8_t target_protocol,
+				  struct rte_flow_error *error);
 #endif /* RTE_PMD_MLX5_FLOW_H_ */
diff --git a/drivers/net/mlx5/mlx5_flow_dv.c b/drivers/net/mlx5/mlx5_flow_dv.c
index 7240d3b..ab758d4 100644
--- a/drivers/net/mlx5/mlx5_flow_dv.c
+++ b/drivers/net/mlx5/mlx5_flow_dv.c
@@ -2966,7 +2966,6 @@  struct field_modify_info modify_tcp[] = {
 					     MLX5_FLOW_LAYER_OUTER_L4_UDP;
 			break;
 		case RTE_FLOW_ITEM_TYPE_GRE:
-		case RTE_FLOW_ITEM_TYPE_NVGRE:
 			ret = mlx5_flow_validate_item_gre(items, item_flags,
 							  next_protocol, error);
 			if (ret < 0)
@@ -2974,6 +2973,14 @@  struct field_modify_info modify_tcp[] = {
 			gre_item = items;
 			last_item = MLX5_FLOW_LAYER_GRE;
 			break;
+		case RTE_FLOW_ITEM_TYPE_NVGRE:
+			ret = mlx5_flow_validate_item_nvgre(items, item_flags,
+							    next_protocol,
+							    error);
+			if (ret < 0)
+				return ret;
+			last_item = MLX5_FLOW_LAYER_NVGRE;
+			break;
 		case RTE_FLOW_ITEM_TYPE_GRE_KEY:
 			ret = mlx5_flow_validate_item_gre_key
 				(items, item_flags, gre_item, error);
@@ -3919,7 +3926,21 @@  struct field_modify_info modify_tcp[] = {
 	int size;
 	int i;
 
-	flow_dv_translate_item_gre(matcher, key, item, inner);
+	/* For NVGRE, GRE header fields must be set with defined values. */
+	const struct rte_flow_item_gre gre_spec = {
+		.c_rsvd0_ver = RTE_BE16(0x2000),
+		.protocol = RTE_BE16(RTE_ETHER_TYPE_TEB)
+	};
+	const struct rte_flow_item_gre gre_mask = {
+		.c_rsvd0_ver = RTE_BE16(UINT16_MAX),
+		.protocol = RTE_BE16(UINT16_MAX),
+	};
+	const struct rte_flow_item gre_item = {
+		.spec = &gre_spec,
+		.mask = &gre_mask,
+		.last = NULL,
+	};
+	flow_dv_translate_item_gre(matcher, key, &gre_item, inner);
 	if (!nvgre_v)
 		return;
 	if (!nvgre_m)
diff --git a/drivers/net/mlx5/mlx5_rxtx.h b/drivers/net/mlx5/mlx5_rxtx.h
index dfa79e2..d732757 100644
--- a/drivers/net/mlx5/mlx5_rxtx.h
+++ b/drivers/net/mlx5/mlx5_rxtx.h
@@ -40,7 +40,7 @@ 
 #include "mlx5_glue.h"
 
 /* Support tunnel matching. */
-#define MLX5_FLOW_TUNNEL 5
+#define MLX5_FLOW_TUNNEL 6
 
 struct mlx5_rxq_stats {
 #ifdef MLX5_PMD_SOFT_COUNTERS