[dpdk-dev] [PATCH v10 2/3] ethdev: extend RSS offload types

[Su, Simei]

Hi, Andrew

> -----Original Message-----
> From: Andrew Rybchenko [mailto:arybchenko at solarflare.com]
> Sent: Wednesday, October 9, 2019 12:46 AM
> To: Su, Simei <simei.su at intel.com>; Zhang, Qi Z <qi.z.zhang at intel.com>; Ye,
> Xiaolong <xiaolong.ye at intel.com>; Yigit, Ferruh <ferruh.yigit at intel.com>
> Cc: dev at dpdk.org
> Subject: Re: [dpdk-dev] [PATCH v10 2/3] ethdev: extend RSS offload types
> 
> On 10/4/19 7:46 AM, Simei Su wrote:
> > This patch reserves several bits as input set selection from the high
> > end of the 64 bits. It is combined with exisiting ETH_RSS_* to
> > represent RSS types.
> >
> > Signed-off-by: Simei Su <simei.su at intel.com>
> > Reviewed-by: Qi Zhang <qi.z.zhang at intel.com>
> > Acked-by: Ori Kam <orika at mellanox.com>
> > ---
> >   lib/librte_ethdev/rte_ethdev.c | 42
> ++++++++++++++++++++++++++++++++++++++++++
> >   lib/librte_ethdev/rte_ethdev.h | 14 ++++++++++++++
> >   2 files changed, 56 insertions(+)
> >
> > diff --git a/lib/librte_ethdev/rte_ethdev.c
> > b/lib/librte_ethdev/rte_ethdev.c index af82360..1666652 100644
> > --- a/lib/librte_ethdev/rte_ethdev.c
> > +++ b/lib/librte_ethdev/rte_ethdev.c
> > @@ -1115,6 +1115,26 @@ struct rte_eth_dev *
> >   	return name;
> >   }
> >
> > +static uint64_t
> > +strip_out_src_dst_only(uint64_t value, uint64_t layer) {
> > +	uint64_t flag = 0;
> > +
> > +	if (layer == 3) {
> > +		if ((value & ETH_RSS_L3_SRC_ONLY) &&
> > +			(value & ETH_RSS_L3_DST_ONLY))
> > +				flag = 1;
> > +	}
> > +
> > +	if (layer == 4) {
> > +		if ((value & ETH_RSS_L4_SRC_ONLY) &&
> > +			(value & ETH_RSS_L4_DST_ONLY))
> > +				flag = 1;
> > +	}
> > +
> > +	return flag;
> > +}
> > +
> 
> I though about something like:
> 
> static uint64_t
> strip_out_src_dst_only(uint64_t rss_hf)
> {
> 	if ((rss_hf & ETH_RSS_L3_SRC_ONLY) && (rss_hf &
> ETH_RSS_L3_DST_ONLY))
> 		rss_hf &= ~(ETH_RSS_L3_SRC_ONLY | ETH_RSS_L3_DST_ONLY);
> 
> 	if ((rss_hf & ETH_RSS_L4_SRC_ONLY) && (rss_hf &
> ETH_RSS_L4_DST_ONLY))
> 		rss_hf &= ~(ETH_RSS_L4_SRC_ONLY | ETH_RSS_L4_DST_ONLY);
> 
> 	return rss_hf;
> }
> 
> dev_conf->rx_adv_conf.rss_conf.rss_hf =
> 	strip_out_src_dst_only(dev_conf->rx_adv_conf.rss_conf.rss_hf);
> 
> or void function with uint64_t *rss_hf argument.

  Yes, this way is more concise and clear. I have sent PATCH v11. Thanks for your guidance.

> 
> >   int
> >   rte_eth_dev_configure(uint16_t port_id, uint16_t nb_rx_q, uint16_t
> nb_tx_q,
> >   		      const struct rte_eth_conf *dev_conf) @@ -1124,6 +1144,8
> @@
> > struct rte_eth_dev *
> >   	struct rte_eth_conf orig_conf;
> >   	int diag;
> >   	int ret;
> > +	uint64_t layer3 = 3;
> > +	uint64_t layer4 = 4;
> >
> >   	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
> >
> > @@ -1269,6 +1291,16 @@ struct rte_eth_dev *
> >   		goto rollback;
> >   	}
> >
> > +	if (strip_out_src_dst_only(
> > +		dev_conf->rx_adv_conf.rss_conf.rss_hf, layer3) == 1)
> > +			dev->data->dev_conf.rx_adv_conf.rss_conf.rss_hf &=
> > +				~(ETH_RSS_L3_SRC_ONLY | ETH_RSS_L3_DST_ONLY);
> > +
> > +	if (strip_out_src_dst_only(
> > +		dev_conf->rx_adv_conf.rss_conf.rss_hf, layer4) == 1)
> > +			dev->data->dev_conf.rx_adv_conf.rss_conf.rss_hf &=
> > +				~(ETH_RSS_L4_SRC_ONLY | ETH_RSS_L4_DST_ONLY);
> > +
> >   	/* Check that device supports requested rss hash functions. */
> >   	if ((dev_info.flow_type_rss_offloads |
> >   	     dev_conf->rx_adv_conf.rss_conf.rss_hf) != @@ -3105,6 +3137,8
> > @@ struct rte_eth_dev *
> >   	struct rte_eth_dev *dev;
> >   	struct rte_eth_dev_info dev_info = { .flow_type_rss_offloads = 0, };
> >   	int ret;
> > +	uint64_t layer3 = 3;
> > +	uint64_t layer4 = 4;
> >
> >   	RTE_ETH_VALID_PORTID_OR_ERR_RET(port_id, -ENODEV);
> >
> > @@ -3112,6 +3146,14 @@ struct rte_eth_dev *
> >   	if (ret != 0)
> >   		return ret;
> >
> > +	if (strip_out_src_dst_only(rss_conf->rss_hf, layer3) == 1)
> > +		rss_conf->rss_hf &=
> > +			~(ETH_RSS_L3_SRC_ONLY | ETH_RSS_L3_DST_ONLY);
> > +
> > +	if (strip_out_src_dst_only(rss_conf->rss_hf, layer4) == 1)
> > +		rss_conf->rss_hf &=
> > +			~(ETH_RSS_L4_SRC_ONLY | ETH_RSS_L4_DST_ONLY);
> > +
> >   	dev = &rte_eth_devices[port_id];
> >   	if ((dev_info.flow_type_rss_offloads | rss_conf->rss_hf) !=
> >   	    dev_info.flow_type_rss_offloads) { diff --git
> > a/lib/librte_ethdev/rte_ethdev.h b/lib/librte_ethdev/rte_ethdev.h
> > index 7722f70..6d61b84 100644
> > --- a/lib/librte_ethdev/rte_ethdev.h
> > +++ b/lib/librte_ethdev/rte_ethdev.h
> > @@ -505,6 +505,20 @@ struct rte_eth_rss_conf {
> >   #define ETH_RSS_GENEVE             (1ULL << 20)
> >   #define ETH_RSS_NVGRE              (1ULL << 21)
> >
> > +/*
> > + * We use the following macros to combine with above ETH_RSS_* for
> > + * more specific input set selection. These bits are defined starting
> > + * from the high end of the 64 bits.
> > + * Note: If we use above ETH_RSS_* without SRC/DST_ONLY, it
> > +represents
> > + * both SRC and DST are taken into account. If SRC_ONLY and DST_ONLY
> > +of
> > + * the same level be used simultaneously, it is the same case as none
> > +of
> > + * them are added.
> > + */
> > +#define ETH_RSS_L3_SRC_ONLY        (1ULL << 63)
> > +#define ETH_RSS_L3_DST_ONLY        (1ULL << 62)
> > +#define ETH_RSS_L4_SRC_ONLY        (1ULL << 61)
> > +#define ETH_RSS_L4_DST_ONLY        (1ULL << 60)
> > +
> >   #define ETH_RSS_IP ( \
> >   	ETH_RSS_IPV4 | \
> >   	ETH_RSS_FRAG_IPV4 | \