[PATCH v2] net/enic: add support for eCPRI matching

[Ferruh Yigit]

On 1/26/2022 9:48 PM, John Daley wrote:
> eCPRI message can be over Ethernet layer (.1Q supported also) or over
> UDP layer. Message header formats are the same in these two variants.
> 
> Only up though the first packet header in the PDU can be matched.
> RSS on the eCPRI header fields is not supported.
> 
> Signed-off-by: John Daley <johndale at cisco.com>
> Reviewed-by: Hyong Youb Kim <hyonkim at cisco.com>
> ---
> v2 - include enic.ini update
> 
>   doc/guides/nics/features/enic.ini      |  1 +
>   doc/guides/rel_notes/release_22_03.rst |  1 +
>   drivers/net/enic/enic_fm_flow.c        | 65 ++++++++++++++++++++++++++
>   3 files changed, 67 insertions(+)
> 
> diff --git a/doc/guides/nics/features/enic.ini b/doc/guides/nics/features/enic.ini
> index c3bcead05e..88e4ef8c64 100644
> --- a/doc/guides/nics/features/enic.ini
> +++ b/doc/guides/nics/features/enic.ini
> @@ -53,6 +53,7 @@ vlan                 = Y
>   vxlan                = Y
>   geneve               = Y
>   geneve_opt           = Y
> +ecpri                = Y

Can you please add in alphabetical order, as in 'doc/guides/nics/features/default.ini'?

>   
>   [rte_flow actions]
>   count                = Y
> diff --git a/doc/guides/rel_notes/release_22_03.rst b/doc/guides/rel_notes/release_22_03.rst
> index b38dc54e62..52d1e32cf6 100644
> --- a/doc/guides/rel_notes/release_22_03.rst
> +++ b/doc/guides/rel_notes/release_22_03.rst
> @@ -58,6 +58,7 @@ New Features
>   * **Updated Cisco enic driver.**
>   
>     * Added rte_flow support for matching GENEVE packets.
> +  * Added rte_flow support for matching eCPRI packets.
>   
>   Removed Items
>   -------------
> diff --git a/drivers/net/enic/enic_fm_flow.c b/drivers/net/enic/enic_fm_flow.c
> index 752ffeb5c5..589c9253e1 100644
> --- a/drivers/net/enic/enic_fm_flow.c
> +++ b/drivers/net/enic/enic_fm_flow.c
> @@ -237,6 +237,7 @@ static enic_copy_item_fn enic_fm_copy_item_vxlan;
>   static enic_copy_item_fn enic_fm_copy_item_gtp;
>   static enic_copy_item_fn enic_fm_copy_item_geneve;
>   static enic_copy_item_fn enic_fm_copy_item_geneve_opt;
> +static enic_copy_item_fn enic_fm_copy_item_ecpri;
>   
>   /* Ingress actions */
>   static const enum rte_flow_action_type enic_fm_supported_ig_actions[] = {
> @@ -392,6 +393,15 @@ static const struct enic_fm_items enic_fm_items[] = {
>   			       RTE_FLOW_ITEM_TYPE_END,
>   		},
>   	},
> +	[RTE_FLOW_ITEM_TYPE_ECPRI] = {
> +		.copy_item = enic_fm_copy_item_ecpri,
> +		.valid_start_item = 1,
> +		.prev_items = (const enum rte_flow_item_type[]) {
> +			       RTE_FLOW_ITEM_TYPE_ETH,
> +			       RTE_FLOW_ITEM_TYPE_UDP,
> +			       RTE_FLOW_ITEM_TYPE_END,
> +		},
> +	},
>   };
>   
>   static int
> @@ -877,6 +887,61 @@ enic_fm_copy_item_geneve_opt(struct copy_item_args *arg)
>   	return 0;
>   }
>   
> +/* Match eCPRI combined message header */
> +static int
> +enic_fm_copy_item_ecpri(struct copy_item_args *arg)
> +{
> +	const struct rte_flow_item *item = arg->item;
> +	const struct rte_flow_item_ecpri *spec = item->spec;
> +	const struct rte_flow_item_ecpri *mask = item->mask;
> +	struct fm_tcam_match_entry *entry = arg->fm_tcam_entry;
> +	struct fm_header_set *fm_data, *fm_mask;
> +	uint8_t *fm_data_to, *fm_mask_to;
> +
> +	ENICPMD_FUNC_TRACE();
> +
> +	/* Tunneling not supported- only matching on inner eCPRI fields. */
> +	if (arg->header_level > 0)
> +		return -EINVAL;
> +
> +	/* Need both spec and mask */
> +	if (!spec || !mask)
> +		return -EINVAL;
> +
> +	fm_data = &entry->ftm_data.fk_hdrset[0];
> +	fm_mask = &entry->ftm_mask.fk_hdrset[0];
> +
> +	/* eCPRI can only follow L2/VLAN layer if ethernet type is 0xAEFE. */
> +	if (!(fm_data->fk_metadata & FKM_UDP) &&
> +	    (fm_mask->l2.eth.fk_ethtype != UINT16_MAX ||
> +	    rte_cpu_to_be_16(fm_data->l2.eth.fk_ethtype) !=
> +	    RTE_ETHER_TYPE_ECPRI))
> +		return -EINVAL;
> +
> +	if (fm_data->fk_metadata & FKM_UDP) {
> +		/* eCPRI on UDP */
> +		fm_data->fk_header_select |= FKH_L4RAW;
> +		fm_mask->fk_header_select |= FKH_L4RAW;
> +		fm_data_to = &fm_data->l4.rawdata[sizeof(fm_data->l4.udp)];
> +		fm_mask_to = &fm_mask->l4.rawdata[sizeof(fm_data->l4.udp)];
> +	} else {
> +		/* eCPRI directly after Etherent header */
> +		fm_data->fk_header_select |= FKH_L3RAW;
> +		fm_mask->fk_header_select |= FKH_L3RAW;
> +		fm_data_to = &fm_data->l3.rawdata[0];
> +		fm_mask_to = &fm_mask->l3.rawdata[0];
> +	}
> +
> +	/*
> +	 * Use the raw L3 or L4 buffer to match eCPRI since fm_header_set does
> +	 * not have eCPRI header. Only 1st message header of PDU can be matched.
> +	 * "C" * bit ignored.
> +	 */
> +	memcpy(fm_data_to, spec, sizeof(*spec));
> +	memcpy(fm_mask_to, mask, sizeof(*mask));
> +	return 0;
> +}
> +
>   /*
>    * Currently, raw pattern match is very limited. It is intended for matching
>    * UDP tunnel header (e.g. vxlan or geneve).