Re: [dpdk-dev] [PATCH v3] ethdev: increase flow type limit from 32 to 64

[Thomas Monjalon <thomas@monjalon.net>]

16/01/2018 10:44, Rybalchenko, Kirill:
> Hi Thomas,
> 
> From: Thomas Monjalon [mailto:thomas@monjalon.net]
> > 15/01/2018 18:33, Kirill Rybalchenko:
> > > --- a/lib/librte_ether/rte_eth_ctrl.h
> > > +++ b/lib/librte_ether/rte_eth_ctrl.h
> > > @@ -662,9 +662,9 @@ enum rte_fdir_mode {
> > >         RTE_FDIR_MODE_PERFECT_TUNNEL,   /**< Enable FDIR filter mode -
> > tunnel. */
> > >  };
> > >
> > > -#define UINT32_BIT (CHAR_BIT * sizeof(uint32_t))
> > > +#define UINT64_BIT (CHAR_BIT * sizeof(uint64_t))
> > >  #define RTE_FLOW_MASK_ARRAY_SIZE \
> > > -       (RTE_ALIGN(RTE_ETH_FLOW_MAX, UINT32_BIT)/UINT32_BIT)
> > > +       (RTE_ALIGN(RTE_ETH_FLOW_MAX, UINT64_BIT)/UINT64_BIT)
> > >
> > >  /**
> > >   * A structure used to get the information of flow director filter.
> > > @@ -681,7 +681,7 @@ struct rte_eth_fdir_info {
> > >         uint32_t guarant_spc; /**< Guaranteed spaces.*/
> > >         uint32_t best_spc; /**< Best effort spaces.*/
> > >         /** Bit mask for every supported flow type. */
> > > -       uint32_t flow_types_mask[RTE_FLOW_MASK_ARRAY_SIZE];
> > > +       uint64_t flow_types_mask[RTE_FLOW_MASK_ARRAY_SIZE];
> > >         uint32_t max_flexpayload; /**< Total flex payload in bytes. */
> > >         /** Flexible payload unit in bytes. Size and alignments of all flex
> > >             payload segments should be multiplies of this value. */ @@
> > > -774,7 +774,7 @@ enum rte_eth_hash_function {  };
> > >
> > >  #define RTE_SYM_HASH_MASK_ARRAY_SIZE \
> > > -       (RTE_ALIGN(RTE_ETH_FLOW_MAX, UINT32_BIT)/UINT32_BIT)
> > > +       (RTE_ALIGN(RTE_ETH_FLOW_MAX, UINT64_BIT)/UINT64_BIT)
> > >  /**
> > >   * A structure used to set or get global hash function configurations which
> > >   * include symmetric hash enable per flow type and hash function type.
> > > @@ -787,9 +787,9 @@ enum rte_eth_hash_function {  struct
> > > rte_eth_hash_global_conf {
> > >         enum rte_eth_hash_function hash_func; /**< Hash function type */
> > >         /** Bit mask for symmetric hash enable per flow type */
> > > -       uint32_t
> > sym_hash_enable_mask[RTE_SYM_HASH_MASK_ARRAY_SIZE];
> > > +       uint64_t
> > sym_hash_enable_mask[RTE_SYM_HASH_MASK_ARRAY_SIZE];
> > >         /** Bit mask indicates if the corresponding bit is valid */
> > > -       uint32_t valid_bit_mask[RTE_SYM_HASH_MASK_ARRAY_SIZE];
> > > +       uint64_t valid_bit_mask[RTE_SYM_HASH_MASK_ARRAY_SIZE];
> > >  };
> > 
> > This is still changing the ABI.
> > Am I missing something?
> > 
> We change size of structures rte_eth_fdir_info and rte_eth_hash_filter_info.

Yes, and these structures are allocated and read by the application?
So it is an ABI break.

> Application can use these structures for DPDK library API call only in
> rte_eth_dev_filter_ctrl() function call. In the patch this function is
> modified in the way that it will be compatible with user binary applications
> compiled with previous versions of DPDK library.

Have you tried to use a patched DPDK with a binary compiled with DPDK 17.11?