> -----Original Message-----
> From: Thomas Monjalon [mailto:thomas.monjalon at 6wind.com]
> Sent: Tuesday, October 28, 2014 10:15 PM
> To: Wu, Jingjing
> Cc: dev at dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v4 16/21] ethdev: define structures for
> configuring flexible payload
>
> 2014-10-22 09:01, Jingjing Wu:
> > +/**
> > + * A structure defined a field vector to specify each field.
> > + */
> > +struct rte_eth_field_vector {
> > + uint8_t offset; /**< Source word offset */
> > + uint8_t size; /**< Field Size defined in word units */
> > +};
>
> I'm sorry but I don't understand this patch at all.
> I think the reason is that I need more information about flex filter.
>
Yes, it is a little difficult to understand the behavior. Let me explain it as
I can.
<1> flex words:
We can select where the 8 flex words are. It can be constituted of 1-3
partitions.
Each partition is defined as rte_eth_field_vector.
For example:
if we set
rte_eth_flex_payload_cfg = {
.type = RTE_ETH_L4_PAYLOAD;
.nb_field = 1;
.field = {
{0, 8}, /*offset = 0, size =8*/
};
};
This means the 8 words from the beginning of l4 payload will be consider as
flex words.
If we set
rte_eth_flex_payload_cfg = {
.type = RTE_ETH_L4_PAYLOAD;
.nb_field = 1;
.field = {
{0, 2}, /*offset = 0, size =2*/
{4, 6}, /*offset = 4, size =6*/
};
};
This means the 2 words from the beginning of l4 payload plus 6 words form the
offset 4
will be consider as flex words.
<2> flex mask:
As the <1> configuration, we already select 8 words as flex words. Then the
flex mask
Will help us to define whether these word will participate in comparing.
The flex mask can be constituted of 2 partitions. One is word mask, another is
bit mask.
Word mask is defined in rte_eth_fdir_flex_masks.words_mask, it means bit i
enables word i of flex words.
rte_eth_fdir_flex_masks.field specify each word's bit mask, Fortville support 2
word bitmask.
> > +
> > +/**
> > + * payload type
> > + */
> > +enum rte_eth_payload_type {
> > + RTE_ETH_PAYLOAD_UNKNOWN = 0,
> > + RTE_ETH_L2_PAYLOAD,
> > + RTE_ETH_L3_PAYLOAD,
> > + RTE_ETH_L4_PAYLOAD,
> > +};
> > +
> > /**
> > * flow type
> > */
> > @@ -92,6 +111,30 @@ enum rte_eth_flow_type { };
> >
> > /**
> > + * A structure used to select fields extracted from the protocol
> > +layers to
> > + * the Field Vector as flexible payload for filter */ struct
> > +rte_eth_flex_payload_cfg {
> > + enum rte_eth_payload_type type; /**< payload type */
> > + uint8_t nb_field; /**< the number of following fields */
> > + struct rte_eth_field_vector field[0]; };
> > +
> > +#define RTE_ETH_FDIR_CFG_FLX 0x0001
> > +/**
> > + * A structure used to config FDIR filter global set
> > + * to support RTE_ETH_FILTER_FDIR with RTE_ETH_FILTER_SET operation.
> > + */
> > +struct rte_eth_fdir_cfg {
> > + uint16_t cmd; /**< sub command */
> > + /**
> > + * A pointer to structure for the configuration e.g.
> > + * struct rte_eth_flex_payload_cfg for FDIR_CFG_FLX
> > + */
> > + void *cfg;
> > +};
