examples/flow_filtering: fix example documentation

  Previous patch removed the VLAN item from example code.
This patch fixes the documentation accordingly.

Fixes: 9af4eb565710 ("examples/flow_filtering: remove VLAN item")
Cc: orika@mellanox.com

Signed-off-by: Dekel Peled <dekelp@mellanox.com>
---
 doc/guides/sample_app_ug/flow_filtering.rst | 74 +++++++----------------------
 examples/flow_filtering/flow_blocks.c       | 18 ++-----
 2 files changed, 21 insertions(+), 71 deletions(-)
  

> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Dekel Peled
> Sent: Monday, December 24, 2018 12:51 PM
> To: Ori Kam <orika@mellanox.com>
> Cc: dev@dpdk.org; Dekel Peled <dekelp@mellanox.com>
> Subject: [dpdk-dev] [PATCH] examples/flow_filtering: fix example
> documentation
> 
> Previous patch removed the VLAN item from example code.
> This patch fixes the documentation accordingly.

So why are you modifying the c file?

> 
> Fixes: 9af4eb565710 ("examples/flow_filtering: remove VLAN item")
> Cc: orika@mellanox.com
> 
> Signed-off-by: Dekel Peled <dekelp@mellanox.com>
> ---
>  doc/guides/sample_app_ug/flow_filtering.rst | 74 +++++++----------------------
>  examples/flow_filtering/flow_blocks.c       | 18 ++-----
>  2 files changed, 21 insertions(+), 71 deletions(-)
> 
> diff --git a/doc/guides/sample_app_ug/flow_filtering.rst
> b/doc/guides/sample_app_ug/flow_filtering.rst
> index 840d557..9dba85a 100644
> --- a/doc/guides/sample_app_ug/flow_filtering.rst
> +++ b/doc/guides/sample_app_ug/flow_filtering.rst
> @@ -53,7 +53,7 @@ applications and the Environment Abstraction Layer (EAL)
> options.
>  Explanation
>  -----------
> 
> -The example is build from 2 main files,
> +The example is built from 2 files,
>  ``main.c`` which holds the example logic and ``flow_blocks.c`` that holds the
>  implementation for building the flow rule.
> 
> @@ -380,13 +380,9 @@ This function is located in the ``flow_blocks.c`` file.
>     {
>             struct rte_flow_attr attr;
>             struct rte_flow_item pattern[MAX_PATTERN_NUM];
> -           struct rte_flow_action action[MAX_PATTERN_NUM];
> +           struct rte_flow_action action[MAX_ACTION_NUM];
>             struct rte_flow *flow = NULL;
>             struct rte_flow_action_queue queue = { .index = rx_q };
> -           struct rte_flow_item_eth eth_spec;
> -           struct rte_flow_item_eth eth_mask;
> -           struct rte_flow_item_vlan vlan_spec;
> -           struct rte_flow_item_vlan vlan_mask;
>             struct rte_flow_item_ipv4 ip_spec;
>             struct rte_flow_item_ipv4 ip_mask;
> 
> @@ -404,37 +400,19 @@ This function is located in the ``flow_blocks.c`` file.
>              * create the action sequence.
>              * one action only,  move packet to queue
>              */
> -
>             action[0].type = RTE_FLOW_ACTION_TYPE_QUEUE;
>             action[0].conf = &queue;
>             action[1].type = RTE_FLOW_ACTION_TYPE_END;
> 
>             /*
> -            * set the first level of the pattern (eth).
> +            * set the first level of the pattern (ETH).
>              * since in this example we just want to get the
>              * ipv4 we set this level to allow all.
>              */
> -           memset(&eth_spec, 0, sizeof(struct rte_flow_item_eth));
> -           memset(&eth_mask, 0, sizeof(struct rte_flow_item_eth));
> -           eth_spec.type = 0;
> -           eth_mask.type = 0;
>             pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
> -           pattern[0].spec = &eth_spec;
> -           pattern[0].mask = &eth_mask;
> -
> -           /*
> -            * setting the second level of the pattern (vlan).
> -            * since in this example we just want to get the
> -            * ipv4 we also set this level to allow all.
> -            */
> -           memset(&vlan_spec, 0, sizeof(struct rte_flow_item_vlan));
> -           memset(&vlan_mask, 0, sizeof(struct rte_flow_item_vlan));
> -           pattern[1].type = RTE_FLOW_ITEM_TYPE_VLAN;
> -           pattern[1].spec = &vlan_spec;
> -           pattern[1].mask = &vlan_mask;
> 
>             /*
> -            * setting the third level of the pattern (ip).
> +            * setting the second level of the pattern (IP).
>              * in this example this is the level we care about
>              * so we set it according to the parameters.
>              */
> @@ -444,12 +422,12 @@ This function is located in the ``flow_blocks.c`` file.
>             ip_mask.hdr.dst_addr = dest_mask;
>             ip_spec.hdr.src_addr = htonl(src_ip);
>             ip_mask.hdr.src_addr = src_mask;
> -           pattern[2].type = RTE_FLOW_ITEM_TYPE_IPV4;
> -           pattern[2].spec = &ip_spec;
> -           pattern[2].mask = &ip_mask;
> +           pattern[1].type = RTE_FLOW_ITEM_TYPE_IPV4;
> +           pattern[1].spec = &ip_spec;
> +           pattern[1].mask = &ip_mask;
> 
>             /* the final level must be always type end */
> -           pattern[3].type = RTE_FLOW_ITEM_TYPE_END;
> +           pattern[2].type = RTE_FLOW_ITEM_TYPE_END;
> 
>             int res = rte_flow_validate(port_id, &attr, pattern, action, error);
>             if(!res)
> @@ -464,14 +442,10 @@ The first part of the function is declaring the
> structures that will be used.
> 
>     struct rte_flow_attr attr;
>     struct rte_flow_item pattern[MAX_PATTERN_NUM];
> -   struct rte_flow_action action[MAX_PATTERN_NUM];
> +   struct rte_flow_action action[MAX_ACTION_NUM];
>     struct rte_flow *flow;
>     struct rte_flow_error error;
>     struct rte_flow_action_queue queue = { .index = rx_q };
> -   struct rte_flow_item_eth eth_spec;
> -   struct rte_flow_item_eth eth_mask;
> -   struct rte_flow_item_vlan vlan_spec;
> -   struct rte_flow_item_vlan vlan_mask;
>     struct rte_flow_item_ipv4 ip_spec;
>     struct rte_flow_item_ipv4 ip_mask;
> 
> @@ -491,33 +465,17 @@ the rule. In this case send the packet to queue.
>     action[0].conf = &queue;
>     action[1].type = RTE_FLOW_ACTION_TYPE_END;
> 
> -The forth part is responsible for creating the pattern and is build from
> -number of step. In each step we build one level of the pattern starting with
> +The fourth part is responsible for creating the pattern and is built from
> +number of steps. In each step we build one level of the pattern starting with
>  the lowest one.
> 
>  Setting the first level of the pattern ETH:
> 
>  .. code-block:: c
> 
> -   memset(&eth_spec, 0, sizeof(struct rte_flow_item_eth));
> -   memset(&eth_mask, 0, sizeof(struct rte_flow_item_eth));
> -   eth_spec.type = 0;
> -   eth_mask.type = 0;
>     pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
> -   pattern[0].spec = &eth_spec;
> -   pattern[0].mask = &eth_mask;
> -
> -Setting the second level of the pattern VLAN:
> -
> -.. code-block:: c
> -
> -   memset(&vlan_spec, 0, sizeof(struct rte_flow_item_vlan));
> -   memset(&vlan_mask, 0, sizeof(struct rte_flow_item_vlan));
> -   pattern[1].type = RTE_FLOW_ITEM_TYPE_VLAN;
> -   pattern[1].spec = &vlan_spec;
> -   pattern[1].mask = &vlan_mask;
> 
> -Setting the third level ip:
> +Setting the second level of the pattern IP:
> 
>  .. code-block:: c
> 
> @@ -527,15 +485,15 @@ Setting the third level ip:
>     ip_mask.hdr.dst_addr = dest_mask;
>     ip_spec.hdr.src_addr = htonl(src_ip);
>     ip_mask.hdr.src_addr = src_mask;
> -   pattern[2].type = RTE_FLOW_ITEM_TYPE_IPV4;
> -   pattern[2].spec = &ip_spec;
> -   pattern[2].mask = &ip_mask;
> +   pattern[1].type = RTE_FLOW_ITEM_TYPE_IPV4;
> +   pattern[1].spec = &ip_spec;
> +   pattern[1].mask = &ip_mask;
> 
>  Closing the pattern part.
> 
>  .. code-block:: c
> 
> -   pattern[3].type = RTE_FLOW_ITEM_TYPE_END;
> +   pattern[2].type = RTE_FLOW_ITEM_TYPE_END;
> 
>  The last part of the function is to validate the rule and create it.
> 
> diff --git a/examples/flow_filtering/flow_blocks.c
> b/examples/flow_filtering/flow_blocks.c
> index bae7116..1edf6f9 100644
> --- a/examples/flow_filtering/flow_blocks.c
> +++ b/examples/flow_filtering/flow_blocks.c
> @@ -2,7 +2,8 @@
>   * Copyright 2017 Mellanox Technologies, Ltd
>   */
> 
> -#define MAX_PATTERN_NUM		4
> +#define MAX_PATTERN_NUM		3
> +#define MAX_ACTION_NUM		2
> 
>  struct rte_flow *
>  generate_ipv4_flow(uint16_t port_id, uint16_t rx_q,
> @@ -41,11 +42,9 @@ struct rte_flow *
>  {
>  	struct rte_flow_attr attr;
>  	struct rte_flow_item pattern[MAX_PATTERN_NUM];
> -	struct rte_flow_action action[MAX_PATTERN_NUM];
> +	struct rte_flow_action action[MAX_ACTION_NUM];
>  	struct rte_flow *flow = NULL;
>  	struct rte_flow_action_queue queue = { .index = rx_q };
> -	struct rte_flow_item_eth eth_spec;
> -	struct rte_flow_item_eth eth_mask;
>  	struct rte_flow_item_ipv4 ip_spec;
>  	struct rte_flow_item_ipv4 ip_mask;
>  	int res;
> @@ -64,26 +63,19 @@ struct rte_flow *
>  	 * create the action sequence.
>  	 * one action only,  move packet to queue
>  	 */
> -
>  	action[0].type = RTE_FLOW_ACTION_TYPE_QUEUE;
>  	action[0].conf = &queue;
>  	action[1].type = RTE_FLOW_ACTION_TYPE_END;
> 
>  	/*
> -	 * set the first level of the pattern (eth).
> +	 * set the first level of the pattern (ETH).
>  	 * since in this example we just want to get the
>  	 * ipv4 we set this level to allow all.
>  	 */
> -	memset(&eth_spec, 0, sizeof(struct rte_flow_item_eth));
> -	memset(&eth_mask, 0, sizeof(struct rte_flow_item_eth));
> -	eth_spec.type = 0;
> -	eth_mask.type = 0;
>  	pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
> -	pattern[0].spec = &eth_spec;
> -	pattern[0].mask = &eth_mask;
> 
>  	/*
> -	 * setting the third level of the pattern (ip).
> +	 * setting the second level of the pattern (IP).
>  	 * in this example this is the level we care about
>  	 * so we set it according to the parameters.
>  	 */
> --
> 1.8.3.1


Thanks,
Ori
  

PSB.

> -----Original Message-----
> From: Ori Kam
> Sent: Tuesday, December 25, 2018 5:25 AM
> To: Dekel Peled <dekelp@mellanox.com>
> Cc: dev@dpdk.org; Dekel Peled <dekelp@mellanox.com>
> Subject: RE: [dpdk-dev] [PATCH] examples/flow_filtering: fix example
> documentation
> 
> 
> 
> > -----Original Message-----
> > From: dev <dev-bounces@dpdk.org> On Behalf Of Dekel Peled
> > Sent: Monday, December 24, 2018 12:51 PM
> > To: Ori Kam <orika@mellanox.com>
> > Cc: dev@dpdk.org; Dekel Peled <dekelp@mellanox.com>
> > Subject: [dpdk-dev] [PATCH] examples/flow_filtering: fix example
> > documentation
> >
> > Previous patch removed the VLAN item from example code.
> > This patch fixes the documentation accordingly.
> 
> So why are you modifying the c file?
> 

The doc file quotes the c file, needed to modify both to align doc with code.
Code change includes fix of comments, and removing redundant variables and their initialization.

> >
> > Fixes: 9af4eb565710 ("examples/flow_filtering: remove VLAN item")
> > Cc: orika@mellanox.com
> >
> > Signed-off-by: Dekel Peled <dekelp@mellanox.com>
> > ---
> >  doc/guides/sample_app_ug/flow_filtering.rst | 74 +++++++------------------
> ----
> >  examples/flow_filtering/flow_blocks.c       | 18 ++-----
> >  2 files changed, 21 insertions(+), 71 deletions(-)
> >
> > diff --git a/doc/guides/sample_app_ug/flow_filtering.rst
> > b/doc/guides/sample_app_ug/flow_filtering.rst
> > index 840d557..9dba85a 100644
> > --- a/doc/guides/sample_app_ug/flow_filtering.rst
> > +++ b/doc/guides/sample_app_ug/flow_filtering.rst
> > @@ -53,7 +53,7 @@ applications and the Environment Abstraction Layer
> > (EAL) options.
> >  Explanation
> >  -----------
> >
> > -The example is build from 2 main files,
> > +The example is built from 2 files,
> >  ``main.c`` which holds the example logic and ``flow_blocks.c`` that
> > holds the  implementation for building the flow rule.
> >
> > @@ -380,13 +380,9 @@ This function is located in the ``flow_blocks.c`` file.
> >     {
> >             struct rte_flow_attr attr;
> >             struct rte_flow_item pattern[MAX_PATTERN_NUM];
> > -           struct rte_flow_action action[MAX_PATTERN_NUM];
> > +           struct rte_flow_action action[MAX_ACTION_NUM];
> >             struct rte_flow *flow = NULL;
> >             struct rte_flow_action_queue queue = { .index = rx_q };
> > -           struct rte_flow_item_eth eth_spec;
> > -           struct rte_flow_item_eth eth_mask;
> > -           struct rte_flow_item_vlan vlan_spec;
> > -           struct rte_flow_item_vlan vlan_mask;
> >             struct rte_flow_item_ipv4 ip_spec;
> >             struct rte_flow_item_ipv4 ip_mask;
> >
> > @@ -404,37 +400,19 @@ This function is located in the ``flow_blocks.c`` file.
> >              * create the action sequence.
> >              * one action only,  move packet to queue
> >              */
> > -
> >             action[0].type = RTE_FLOW_ACTION_TYPE_QUEUE;
> >             action[0].conf = &queue;
> >             action[1].type = RTE_FLOW_ACTION_TYPE_END;
> >
> >             /*
> > -            * set the first level of the pattern (eth).
> > +            * set the first level of the pattern (ETH).
> >              * since in this example we just want to get the
> >              * ipv4 we set this level to allow all.
> >              */
> > -           memset(&eth_spec, 0, sizeof(struct rte_flow_item_eth));
> > -           memset(&eth_mask, 0, sizeof(struct rte_flow_item_eth));
> > -           eth_spec.type = 0;
> > -           eth_mask.type = 0;
> >             pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
> > -           pattern[0].spec = &eth_spec;
> > -           pattern[0].mask = &eth_mask;
> > -
> > -           /*
> > -            * setting the second level of the pattern (vlan).
> > -            * since in this example we just want to get the
> > -            * ipv4 we also set this level to allow all.
> > -            */
> > -           memset(&vlan_spec, 0, sizeof(struct rte_flow_item_vlan));
> > -           memset(&vlan_mask, 0, sizeof(struct rte_flow_item_vlan));
> > -           pattern[1].type = RTE_FLOW_ITEM_TYPE_VLAN;
> > -           pattern[1].spec = &vlan_spec;
> > -           pattern[1].mask = &vlan_mask;
> >
> >             /*
> > -            * setting the third level of the pattern (ip).
> > +            * setting the second level of the pattern (IP).
> >              * in this example this is the level we care about
> >              * so we set it according to the parameters.
> >              */
> > @@ -444,12 +422,12 @@ This function is located in the ``flow_blocks.c`` file.
> >             ip_mask.hdr.dst_addr = dest_mask;
> >             ip_spec.hdr.src_addr = htonl(src_ip);
> >             ip_mask.hdr.src_addr = src_mask;
> > -           pattern[2].type = RTE_FLOW_ITEM_TYPE_IPV4;
> > -           pattern[2].spec = &ip_spec;
> > -           pattern[2].mask = &ip_mask;
> > +           pattern[1].type = RTE_FLOW_ITEM_TYPE_IPV4;
> > +           pattern[1].spec = &ip_spec;
> > +           pattern[1].mask = &ip_mask;
> >
> >             /* the final level must be always type end */
> > -           pattern[3].type = RTE_FLOW_ITEM_TYPE_END;
> > +           pattern[2].type = RTE_FLOW_ITEM_TYPE_END;
> >
> >             int res = rte_flow_validate(port_id, &attr, pattern, action, error);
> >             if(!res)
> > @@ -464,14 +442,10 @@ The first part of the function is declaring the
> > structures that will be used.
> >
> >     struct rte_flow_attr attr;
> >     struct rte_flow_item pattern[MAX_PATTERN_NUM];
> > -   struct rte_flow_action action[MAX_PATTERN_NUM];
> > +   struct rte_flow_action action[MAX_ACTION_NUM];
> >     struct rte_flow *flow;
> >     struct rte_flow_error error;
> >     struct rte_flow_action_queue queue = { .index = rx_q };
> > -   struct rte_flow_item_eth eth_spec;
> > -   struct rte_flow_item_eth eth_mask;
> > -   struct rte_flow_item_vlan vlan_spec;
> > -   struct rte_flow_item_vlan vlan_mask;
> >     struct rte_flow_item_ipv4 ip_spec;
> >     struct rte_flow_item_ipv4 ip_mask;
> >
> > @@ -491,33 +465,17 @@ the rule. In this case send the packet to queue.
> >     action[0].conf = &queue;
> >     action[1].type = RTE_FLOW_ACTION_TYPE_END;
> >
> > -The forth part is responsible for creating the pattern and is build
> > from -number of step. In each step we build one level of the pattern
> > starting with
> > +The fourth part is responsible for creating the pattern and is built
> > +from number of steps. In each step we build one level of the pattern
> > +starting with
> >  the lowest one.
> >
> >  Setting the first level of the pattern ETH:
> >
> >  .. code-block:: c
> >
> > -   memset(&eth_spec, 0, sizeof(struct rte_flow_item_eth));
> > -   memset(&eth_mask, 0, sizeof(struct rte_flow_item_eth));
> > -   eth_spec.type = 0;
> > -   eth_mask.type = 0;
> >     pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
> > -   pattern[0].spec = &eth_spec;
> > -   pattern[0].mask = &eth_mask;
> > -
> > -Setting the second level of the pattern VLAN:
> > -
> > -.. code-block:: c
> > -
> > -   memset(&vlan_spec, 0, sizeof(struct rte_flow_item_vlan));
> > -   memset(&vlan_mask, 0, sizeof(struct rte_flow_item_vlan));
> > -   pattern[1].type = RTE_FLOW_ITEM_TYPE_VLAN;
> > -   pattern[1].spec = &vlan_spec;
> > -   pattern[1].mask = &vlan_mask;
> >
> > -Setting the third level ip:
> > +Setting the second level of the pattern IP:
> >
> >  .. code-block:: c
> >
> > @@ -527,15 +485,15 @@ Setting the third level ip:
> >     ip_mask.hdr.dst_addr = dest_mask;
> >     ip_spec.hdr.src_addr = htonl(src_ip);
> >     ip_mask.hdr.src_addr = src_mask;
> > -   pattern[2].type = RTE_FLOW_ITEM_TYPE_IPV4;
> > -   pattern[2].spec = &ip_spec;
> > -   pattern[2].mask = &ip_mask;
> > +   pattern[1].type = RTE_FLOW_ITEM_TYPE_IPV4;
> > +   pattern[1].spec = &ip_spec;
> > +   pattern[1].mask = &ip_mask;
> >
> >  Closing the pattern part.
> >
> >  .. code-block:: c
> >
> > -   pattern[3].type = RTE_FLOW_ITEM_TYPE_END;
> > +   pattern[2].type = RTE_FLOW_ITEM_TYPE_END;
> >
> >  The last part of the function is to validate the rule and create it.
> >
> > diff --git a/examples/flow_filtering/flow_blocks.c
> > b/examples/flow_filtering/flow_blocks.c
> > index bae7116..1edf6f9 100644
> > --- a/examples/flow_filtering/flow_blocks.c
> > +++ b/examples/flow_filtering/flow_blocks.c
> > @@ -2,7 +2,8 @@
> >   * Copyright 2017 Mellanox Technologies, Ltd
> >   */
> >
> > -#define MAX_PATTERN_NUM		4
> > +#define MAX_PATTERN_NUM		3
> > +#define MAX_ACTION_NUM		2
> >
> >  struct rte_flow *
> >  generate_ipv4_flow(uint16_t port_id, uint16_t rx_q, @@ -41,11 +42,9
> > @@ struct rte_flow *  {
> >  	struct rte_flow_attr attr;
> >  	struct rte_flow_item pattern[MAX_PATTERN_NUM];
> > -	struct rte_flow_action action[MAX_PATTERN_NUM];
> > +	struct rte_flow_action action[MAX_ACTION_NUM];
> >  	struct rte_flow *flow = NULL;
> >  	struct rte_flow_action_queue queue = { .index = rx_q };
> > -	struct rte_flow_item_eth eth_spec;
> > -	struct rte_flow_item_eth eth_mask;
> >  	struct rte_flow_item_ipv4 ip_spec;
> >  	struct rte_flow_item_ipv4 ip_mask;
> >  	int res;
> > @@ -64,26 +63,19 @@ struct rte_flow *
> >  	 * create the action sequence.
> >  	 * one action only,  move packet to queue
> >  	 */
> > -
> >  	action[0].type = RTE_FLOW_ACTION_TYPE_QUEUE;
> >  	action[0].conf = &queue;
> >  	action[1].type = RTE_FLOW_ACTION_TYPE_END;
> >
> >  	/*
> > -	 * set the first level of the pattern (eth).
> > +	 * set the first level of the pattern (ETH).
> >  	 * since in this example we just want to get the
> >  	 * ipv4 we set this level to allow all.
> >  	 */
> > -	memset(&eth_spec, 0, sizeof(struct rte_flow_item_eth));
> > -	memset(&eth_mask, 0, sizeof(struct rte_flow_item_eth));
> > -	eth_spec.type = 0;
> > -	eth_mask.type = 0;
> >  	pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
> > -	pattern[0].spec = &eth_spec;
> > -	pattern[0].mask = &eth_mask;
> >
> >  	/*
> > -	 * setting the third level of the pattern (ip).
> > +	 * setting the second level of the pattern (IP).
> >  	 * in this example this is the level we care about
> >  	 * so we set it according to the parameters.
> >  	 */
> > --
> > 1.8.3.1
> 
> 
> Thanks,
> Ori
  

PSB

> -----Original Message-----
> From: Dekel Peled
> Sent: Tuesday, December 25, 2018 8:31 AM
> To: Ori Kam <orika@mellanox.com>
> Cc: dev@dpdk.org
> Subject: RE: [dpdk-dev] [PATCH] examples/flow_filtering: fix example
> documentation
> 
> PSB.
> 
> > -----Original Message-----
> > From: Ori Kam
> > Sent: Tuesday, December 25, 2018 5:25 AM
> > To: Dekel Peled <dekelp@mellanox.com>
> > Cc: dev@dpdk.org; Dekel Peled <dekelp@mellanox.com>
> > Subject: RE: [dpdk-dev] [PATCH] examples/flow_filtering: fix example
> > documentation
> >
> >
> >
> > > -----Original Message-----
> > > From: dev <dev-bounces@dpdk.org> On Behalf Of Dekel Peled
> > > Sent: Monday, December 24, 2018 12:51 PM
> > > To: Ori Kam <orika@mellanox.com>
> > > Cc: dev@dpdk.org; Dekel Peled <dekelp@mellanox.com>
> > > Subject: [dpdk-dev] [PATCH] examples/flow_filtering: fix example
> > > documentation
> > >
> > > Previous patch removed the VLAN item from example code.
> > > This patch fixes the documentation accordingly.
> >
> > So why are you modifying the c file?
> >
> 
> The doc file quotes the c file, needed to modify both to align doc with code.
> Code change includes fix of comments, and removing redundant variables and
> their initialization.
> 

Modify the H to match the C I agree. 
Changing the C file is something else, since in order to make the H file match the C file you only need to change the H.

If you also wish to do some code cleanup feel free, but make sure you are adding this also 
to the commit log. 

> > >
> > > Fixes: 9af4eb565710 ("examples/flow_filtering: remove VLAN item")
> > > Cc: orika@mellanox.com
> > >
> > > Signed-off-by: Dekel Peled <dekelp@mellanox.com>
> > > ---
> > >  doc/guides/sample_app_ug/flow_filtering.rst | 74 +++++++------------------
> > ----
> > >  examples/flow_filtering/flow_blocks.c       | 18 ++-----
> > >  2 files changed, 21 insertions(+), 71 deletions(-)
> > >
> > > diff --git a/doc/guides/sample_app_ug/flow_filtering.rst
> > > b/doc/guides/sample_app_ug/flow_filtering.rst
> > > index 840d557..9dba85a 100644
> > > --- a/doc/guides/sample_app_ug/flow_filtering.rst
> > > +++ b/doc/guides/sample_app_ug/flow_filtering.rst
> > > @@ -53,7 +53,7 @@ applications and the Environment Abstraction Layer
> > > (EAL) options.
> > >  Explanation
> > >  -----------
> > >
> > > -The example is build from 2 main files,
> > > +The example is built from 2 files,
> > >  ``main.c`` which holds the example logic and ``flow_blocks.c`` that
> > > holds the  implementation for building the flow rule.
> > >
> > > @@ -380,13 +380,9 @@ This function is located in the ``flow_blocks.c`` file.
> > >     {
> > >             struct rte_flow_attr attr;
> > >             struct rte_flow_item pattern[MAX_PATTERN_NUM];
> > > -           struct rte_flow_action action[MAX_PATTERN_NUM];
> > > +           struct rte_flow_action action[MAX_ACTION_NUM];
> > >             struct rte_flow *flow = NULL;
> > >             struct rte_flow_action_queue queue = { .index = rx_q };
> > > -           struct rte_flow_item_eth eth_spec;
> > > -           struct rte_flow_item_eth eth_mask;
> > > -           struct rte_flow_item_vlan vlan_spec;
> > > -           struct rte_flow_item_vlan vlan_mask;
> > >             struct rte_flow_item_ipv4 ip_spec;
> > >             struct rte_flow_item_ipv4 ip_mask;
> > >
> > > @@ -404,37 +400,19 @@ This function is located in the ``flow_blocks.c``
> file.
> > >              * create the action sequence.
> > >              * one action only,  move packet to queue
> > >              */
> > > -
> > >             action[0].type = RTE_FLOW_ACTION_TYPE_QUEUE;
> > >             action[0].conf = &queue;
> > >             action[1].type = RTE_FLOW_ACTION_TYPE_END;
> > >
> > >             /*
> > > -            * set the first level of the pattern (eth).
> > > +            * set the first level of the pattern (ETH).
> > >              * since in this example we just want to get the
> > >              * ipv4 we set this level to allow all.
> > >              */
> > > -           memset(&eth_spec, 0, sizeof(struct rte_flow_item_eth));
> > > -           memset(&eth_mask, 0, sizeof(struct rte_flow_item_eth));
> > > -           eth_spec.type = 0;
> > > -           eth_mask.type = 0;
> > >             pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
> > > -           pattern[0].spec = &eth_spec;
> > > -           pattern[0].mask = &eth_mask;
> > > -
> > > -           /*
> > > -            * setting the second level of the pattern (vlan).
> > > -            * since in this example we just want to get the
> > > -            * ipv4 we also set this level to allow all.
> > > -            */
> > > -           memset(&vlan_spec, 0, sizeof(struct rte_flow_item_vlan));
> > > -           memset(&vlan_mask, 0, sizeof(struct rte_flow_item_vlan));
> > > -           pattern[1].type = RTE_FLOW_ITEM_TYPE_VLAN;
> > > -           pattern[1].spec = &vlan_spec;
> > > -           pattern[1].mask = &vlan_mask;
> > >
> > >             /*
> > > -            * setting the third level of the pattern (ip).
> > > +            * setting the second level of the pattern (IP).
> > >              * in this example this is the level we care about
> > >              * so we set it according to the parameters.
> > >              */
> > > @@ -444,12 +422,12 @@ This function is located in the ``flow_blocks.c``
> file.
> > >             ip_mask.hdr.dst_addr = dest_mask;
> > >             ip_spec.hdr.src_addr = htonl(src_ip);
> > >             ip_mask.hdr.src_addr = src_mask;
> > > -           pattern[2].type = RTE_FLOW_ITEM_TYPE_IPV4;
> > > -           pattern[2].spec = &ip_spec;
> > > -           pattern[2].mask = &ip_mask;
> > > +           pattern[1].type = RTE_FLOW_ITEM_TYPE_IPV4;
> > > +           pattern[1].spec = &ip_spec;
> > > +           pattern[1].mask = &ip_mask;
> > >
> > >             /* the final level must be always type end */
> > > -           pattern[3].type = RTE_FLOW_ITEM_TYPE_END;
> > > +           pattern[2].type = RTE_FLOW_ITEM_TYPE_END;
> > >
> > >             int res = rte_flow_validate(port_id, &attr, pattern, action, error);
> > >             if(!res)
> > > @@ -464,14 +442,10 @@ The first part of the function is declaring the
> > > structures that will be used.
> > >
> > >     struct rte_flow_attr attr;
> > >     struct rte_flow_item pattern[MAX_PATTERN_NUM];
> > > -   struct rte_flow_action action[MAX_PATTERN_NUM];
> > > +   struct rte_flow_action action[MAX_ACTION_NUM];
> > >     struct rte_flow *flow;
> > >     struct rte_flow_error error;
> > >     struct rte_flow_action_queue queue = { .index = rx_q };
> > > -   struct rte_flow_item_eth eth_spec;
> > > -   struct rte_flow_item_eth eth_mask;
> > > -   struct rte_flow_item_vlan vlan_spec;
> > > -   struct rte_flow_item_vlan vlan_mask;
> > >     struct rte_flow_item_ipv4 ip_spec;
> > >     struct rte_flow_item_ipv4 ip_mask;
> > >
> > > @@ -491,33 +465,17 @@ the rule. In this case send the packet to queue.
> > >     action[0].conf = &queue;
> > >     action[1].type = RTE_FLOW_ACTION_TYPE_END;
> > >
> > > -The forth part is responsible for creating the pattern and is build
> > > from -number of step. In each step we build one level of the pattern
> > > starting with
> > > +The fourth part is responsible for creating the pattern and is built
> > > +from number of steps. In each step we build one level of the pattern
> > > +starting with
> > >  the lowest one.
> > >
> > >  Setting the first level of the pattern ETH:
> > >
> > >  .. code-block:: c
> > >
> > > -   memset(&eth_spec, 0, sizeof(struct rte_flow_item_eth));
> > > -   memset(&eth_mask, 0, sizeof(struct rte_flow_item_eth));
> > > -   eth_spec.type = 0;
> > > -   eth_mask.type = 0;
> > >     pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
> > > -   pattern[0].spec = &eth_spec;
> > > -   pattern[0].mask = &eth_mask;
> > > -
> > > -Setting the second level of the pattern VLAN:
> > > -
> > > -.. code-block:: c
> > > -
> > > -   memset(&vlan_spec, 0, sizeof(struct rte_flow_item_vlan));
> > > -   memset(&vlan_mask, 0, sizeof(struct rte_flow_item_vlan));
> > > -   pattern[1].type = RTE_FLOW_ITEM_TYPE_VLAN;
> > > -   pattern[1].spec = &vlan_spec;
> > > -   pattern[1].mask = &vlan_mask;
> > >
> > > -Setting the third level ip:
> > > +Setting the second level of the pattern IP:
> > >
> > >  .. code-block:: c
> > >
> > > @@ -527,15 +485,15 @@ Setting the third level ip:
> > >     ip_mask.hdr.dst_addr = dest_mask;
> > >     ip_spec.hdr.src_addr = htonl(src_ip);
> > >     ip_mask.hdr.src_addr = src_mask;
> > > -   pattern[2].type = RTE_FLOW_ITEM_TYPE_IPV4;
> > > -   pattern[2].spec = &ip_spec;
> > > -   pattern[2].mask = &ip_mask;
> > > +   pattern[1].type = RTE_FLOW_ITEM_TYPE_IPV4;
> > > +   pattern[1].spec = &ip_spec;
> > > +   pattern[1].mask = &ip_mask;
> > >
> > >  Closing the pattern part.
> > >
> > >  .. code-block:: c
> > >
> > > -   pattern[3].type = RTE_FLOW_ITEM_TYPE_END;
> > > +   pattern[2].type = RTE_FLOW_ITEM_TYPE_END;
> > >
> > >  The last part of the function is to validate the rule and create it.
> > >
> > > diff --git a/examples/flow_filtering/flow_blocks.c
> > > b/examples/flow_filtering/flow_blocks.c
> > > index bae7116..1edf6f9 100644
> > > --- a/examples/flow_filtering/flow_blocks.c
> > > +++ b/examples/flow_filtering/flow_blocks.c
> > > @@ -2,7 +2,8 @@
> > >   * Copyright 2017 Mellanox Technologies, Ltd
> > >   */
> > >
> > > -#define MAX_PATTERN_NUM		4
> > > +#define MAX_PATTERN_NUM		3
> > > +#define MAX_ACTION_NUM		2
> > >
> > >  struct rte_flow *
> > >  generate_ipv4_flow(uint16_t port_id, uint16_t rx_q, @@ -41,11 +42,9
> > > @@ struct rte_flow *  {
> > >  	struct rte_flow_attr attr;
> > >  	struct rte_flow_item pattern[MAX_PATTERN_NUM];
> > > -	struct rte_flow_action action[MAX_PATTERN_NUM];
> > > +	struct rte_flow_action action[MAX_ACTION_NUM];
> > >  	struct rte_flow *flow = NULL;
> > >  	struct rte_flow_action_queue queue = { .index = rx_q };
> > > -	struct rte_flow_item_eth eth_spec;
> > > -	struct rte_flow_item_eth eth_mask;
> > >  	struct rte_flow_item_ipv4 ip_spec;
> > >  	struct rte_flow_item_ipv4 ip_mask;
> > >  	int res;
> > > @@ -64,26 +63,19 @@ struct rte_flow *
> > >  	 * create the action sequence.
> > >  	 * one action only,  move packet to queue
> > >  	 */
> > > -
> > >  	action[0].type = RTE_FLOW_ACTION_TYPE_QUEUE;
> > >  	action[0].conf = &queue;
> > >  	action[1].type = RTE_FLOW_ACTION_TYPE_END;
> > >
> > >  	/*
> > > -	 * set the first level of the pattern (eth).
> > > +	 * set the first level of the pattern (ETH).
> > >  	 * since in this example we just want to get the
> > >  	 * ipv4 we set this level to allow all.
> > >  	 */
> > > -	memset(&eth_spec, 0, sizeof(struct rte_flow_item_eth));
> > > -	memset(&eth_mask, 0, sizeof(struct rte_flow_item_eth));
> > > -	eth_spec.type = 0;
> > > -	eth_mask.type = 0;
> > >  	pattern[0].type = RTE_FLOW_ITEM_TYPE_ETH;
> > > -	pattern[0].spec = &eth_spec;
> > > -	pattern[0].mask = &eth_mask;
> > >
> > >  	/*
> > > -	 * setting the third level of the pattern (ip).
> > > +	 * setting the second level of the pattern (IP).
> > >  	 * in this example this is the level we care about
> > >  	 * so we set it according to the parameters.
> > >  	 */
> > > --
> > > 1.8.3.1
> >
> >
> > Thanks,
> > Ori
  

On 12/25/2018 6:30 AM, Dekel Peled wrote:
> PSB.
> 
>> -----Original Message-----
>> From: Ori Kam
>> Sent: Tuesday, December 25, 2018 5:25 AM
>> To: Dekel Peled <dekelp@mellanox.com>
>> Cc: dev@dpdk.org; Dekel Peled <dekelp@mellanox.com>
>> Subject: RE: [dpdk-dev] [PATCH] examples/flow_filtering: fix example
>> documentation
>>
>>
>>
>>> -----Original Message-----
>>> From: dev <dev-bounces@dpdk.org> On Behalf Of Dekel Peled
>>> Sent: Monday, December 24, 2018 12:51 PM
>>> To: Ori Kam <orika@mellanox.com>
>>> Cc: dev@dpdk.org; Dekel Peled <dekelp@mellanox.com>
>>> Subject: [dpdk-dev] [PATCH] examples/flow_filtering: fix example
>>> documentation
>>>
>>> Previous patch removed the VLAN item from example code.
>>> This patch fixes the documentation accordingly.
>>
>> So why are you modifying the c file?
>>
> 
> The doc file quotes the c file, needed to modify both to align doc with code.
> Code change includes fix of comments, and removing redundant variables and their initialization.

What about removing the code from doc file, it is guaranteed that it will be
outdated again? Or perhaps just add pseudo code if required.
  

Hi Ferruh, PSB

> -----Original Message-----
> From: Ferruh Yigit <ferruh.yigit@intel.com>
> Sent: Wednesday, January 2, 2019 4:53 PM
> To: Dekel Peled <dekelp@mellanox.com>; Ori Kam <orika@mellanox.com>
> Cc: dev@dpdk.org
> Subject: Re: [dpdk-dev] [PATCH] examples/flow_filtering: fix example
> documentation
> 
> On 12/25/2018 6:30 AM, Dekel Peled wrote:
> > PSB.
> >
> >> -----Original Message-----
> >> From: Ori Kam
> >> Sent: Tuesday, December 25, 2018 5:25 AM
> >> To: Dekel Peled <dekelp@mellanox.com>
> >> Cc: dev@dpdk.org; Dekel Peled <dekelp@mellanox.com>
> >> Subject: RE: [dpdk-dev] [PATCH] examples/flow_filtering: fix example
> >> documentation
> >>
> >>
> >>
> >>> -----Original Message-----
> >>> From: dev <dev-bounces@dpdk.org> On Behalf Of Dekel Peled
> >>> Sent: Monday, December 24, 2018 12:51 PM
> >>> To: Ori Kam <orika@mellanox.com>
> >>> Cc: dev@dpdk.org; Dekel Peled <dekelp@mellanox.com>
> >>> Subject: [dpdk-dev] [PATCH] examples/flow_filtering: fix example
> >>> documentation
> >>>
> >>> Previous patch removed the VLAN item from example code.
> >>> This patch fixes the documentation accordingly.
> >>
> >> So why are you modifying the c file?
> >>
> >
> > The doc file quotes the c file, needed to modify both to align doc with code.
> > Code change includes fix of comments, and removing redundant variables
> and their initialization.
> 
> What about removing the code from doc file, it is guaranteed that it will be
> outdated again? Or perhaps just add pseudo code if required.

I Agree with you, I think it will be better to change the doc to show only the 
key lines just as in the code while the rest of the lines as pseudo code.

Do to time limitation, I will update the doc hopefully only for the 19.05 version.

So please merge the current patch. 

Thanks,
Ori