Re: [dpdk-dev] [PATCH v4 1/3] ethdev: add enum type for loop on Rx/Tx offloads

["Dai, Wei" <wei.dai@intel.com>]

Hi Zhang Qi
Thanks for your feedback.

> -----Original Message-----
> From: Zhang, Qi Z
> Sent: Monday, March 19, 2018 10:06 PM
> To: Dai, Wei <wei.dai@intel.com>; Lu, Wenzhuo <wenzhuo.lu@intel.com>;
> Wu, Jingjing <jingjing.wu@intel.com>
> Cc: dev@dpdk.org; Dai, Wei <wei.dai@intel.com>
> Subject: RE: [dpdk-dev] [PATCH v4 1/3] ethdev: add enum type for loop on
> Rx/Tx offloads
> 
> Hi Daiwei:
> 
> > -----Original Message-----
> > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Wei Dai
> > Sent: Monday, March 19, 2018 8:41 PM
> > To: Lu, Wenzhuo <wenzhuo.lu@intel.com>; Wu, Jingjing
> > <jingjing.wu@intel.com>
> > Cc: dev@dpdk.org; Dai, Wei <wei.dai@intel.com>
> > Subject: [dpdk-dev] [PATCH v4 1/3] ethdev: add enum type for loop on
> > Rx/Tx offloads
> >
> > This patch adds enum rte_eth_rx_offload_type and enum
> > rte_eth_tx_offload_type. For a loop on all Rx offloads, it is
> > convenient to begin with the first enum member
> > ETH_RX_OFFLOAD_FIRST_FEATURE and to end at
> ETH_RX_OFFLOAD_TOTAL_NUM.
> > A loop on all Tx offloads can begin with
> ETH_TX_OFFLOAD_FIRST_FEATURE
> > and end at ETH_TX_OFFLOAD_TOTAL_NUM.
> >
> > Signed-off-by: Wei Dai <wei.dai@intel.com>
> > ---
> >  lib/librte_ether/rte_ethdev.h | 44
> > +++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 44 insertions(+)
> >
> > diff --git a/lib/librte_ether/rte_ethdev.h
> > b/lib/librte_ether/rte_ethdev.h index 0361533..0089ea3 100644
> > --- a/lib/librte_ether/rte_ethdev.h
> > +++ b/lib/librte_ether/rte_ethdev.h
> > @@ -946,6 +946,27 @@ struct rte_eth_conf {
> >  			     DEV_RX_OFFLOAD_VLAN_FILTER | \
> >  			     DEV_RX_OFFLOAD_VLAN_EXTEND)
> >
> > +enum rte_eth_rx_offload_type {
> > +	ETH_RX_OFFLOAD_FIRST_FEATURE = 0,
> > +	ETH_RX_OFFLOAD_VLAN_STRIP = ETH_RX_OFFLOAD_FIRST_FEATURE,
> > +	ETH_RX_OFFLOAD_IPV4_CKSUM,
> > +	ETH_RX_OFFLOAD_UDP_CKSUM,
> > +	ETH_RX_OFFLOAD_TCP_CKSUM,
> > +	ETH_RX_OFFLOAD_TCP_LRO,
> > +	ETH_RX_OFFLOAD_QINQ_STRIP,
> > +	ETH_RX_OFFLOAD_OUTER_IPV4_CKSUM,
> > +	ETH_RX_OFFLOAD_MACSEC_STRIP,
> > +	ETH_RX_OFFLOAD_HEADER_SPLIT,
> > +	ETH_RX_OFFLOAD_VLAN_FILTER,
> > +	ETH_RX_OFFLOAD_VLAN_EXTEND,
> > +	ETH_RX_OFFLOAD_JUMBO_FRAME,
> > +	ETH_RX_OFFLOAD_CRC_STRIP,
> > +	ETH_RX_OFFLOAD_SCATTER,
> > +	ETH_RX_OFFLOAD_TIMESTAMP,
> > +	ETH_RX_OFFLOAD_SECURITY,
> > +	ETH_RX_OFFLOAD_TOTAL_NUM
> > +};
> 
> This looks a little duplicate with rte_rx_offload_names in rte_ethdev.c
rte_rx_offload_names is a static string array defined in rte_ethdev.c, if it can be referred by other files,
the "static" must be removed.

> 
> In patch 2/3 and 3/3, I think if you simply loop from offload bit 0 to bit 63 to
> check the name, that should still work right?
> then this patch could be unnecessary.
Yes, using loop from bit 0 to bit 63 in patch 2/3 and 3/3 can work right.
But I think this enum type is still useful for other application which need to loop on
all possible offloads. 
I will submit this patch as a standalone one and using loop from bit 0 to bit 63 in next version of patch set.

> Regards
> Qi
> > +
> >  /*
> >   * If new Rx offload capabilities are defined, they also must be
> >   * mentioned in rte_rx_offload_names in rte_ethdev.c file.
> > @@ -981,6 +1002,29 @@ struct rte_eth_conf {
> >   */
> >  #define DEV_TX_OFFLOAD_SECURITY         0x00020000
> >
> > +enum rte_eth_tx_offload_type {
> > +	ETH_TX_OFFLOAD_FIRST_FEATURE = 0,
> > +	ETH_TX_OFFLOAD_VLAN_INSERT = ETH_TX_OFFLOAD_FIRST_FEATURE,
> > +	ETH_TX_OFFLOAD_IPV4_CKSUM,
> > +	ETH_TX_OFFLOAD_UDP_CKSUM,
> > +	ETH_TX_OFFLOAD_TCP_CKSUM,
> > +	ETH_TX_OFFLOAD_SCTP_CKSUM,
> > +	ETH_TX_OFFLOAD_TCP_TSO,
> > +	ETH_TX_OFFLOAD_UDP_TSO,
> > +	ETH_TX_OFFLOAD_OUTER_IPV4_CKSUM,
> > +	ETH_TX_OFFLOAD_QINQ_INSERT,
> > +	ETH_TX_OFFLOAD_VXLAN_TNL_TSO,
> > +	ETH_TX_OFFLOAD_GRE_TNL_TSO,
> > +	ETH_TX_OFFLOAD_IPIP_TNL_TSO,
> > +	ETH_TX_OFFLOAD_GENEVE_TNL_TSO,
> > +	ETH_TX_OFFLOAD_MACSEC_INSERT,
> > +	ETH_TX_OFFLOAD_MT_LOCKFREE,
> > +	ETH_TX_OFFLOAD_MULTI_SEGS,
> > +	ETH_TX_OFFLOAD_MBUF_FAST_FREE,
> > +	ETH_TX_OFFLOAD_SECURITY,
> > +	ETH_TX_OFFLOAD_TOTAL_NUM
> > +};
> > +
> >  /*
> >   * If new Tx offload capabilities are defined, they also must be
> >   * mentioned in rte_tx_offload_names in rte_ethdev.c file.
> > --
> > 2.7.5