2022-11-22 22:10:10

by Maciej Fijalkowski

Subject: Re: [PATCH net-next v4 4/7] net: lan966x: Update rxq memory model

On Tue, Nov 22, 2022 at 10:44:10PM +0100, Horatiu Vultur wrote:
> By default the rxq memory model is MEM_TYPE_PAGE_SHARED but to be able
> to reuse pages on the TX side, when the XDP action XDP_TX it is required
> to update the memory model to PAGE_POOL.
>
> Signed-off-by: Horatiu Vultur <[email protected]>
> ---
> .../net/ethernet/microchip/lan966x/lan966x_fdma.c | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
> index 384ed34197d58..483d1470c8362 100644
> --- a/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
> +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
> @@ -78,8 +78,22 @@ static int lan966x_fdma_rx_alloc_page_pool(struct lan966x_rx *rx)
> .max_len = rx->max_mtu -
> SKB_DATA_ALIGN(sizeof(struct skb_shared_info)),
> };
> + struct lan966x_port *port;

port can be scoped only for the loop below?

> + int i;
>
> rx->page_pool = page_pool_create(&pp_params);
> +
> + for (i = 0; i < lan966x->num_phys_ports; ++i) {

Quoting Alex from some other thread:

"Since we're on -std=gnu11 for a bunch of releases already, all new
loops are expected to go with the iterator declarations inside them."

TBH I wasn't aware of that personally :)

> + if (!lan966x->ports[i])
> + continue;
> +
> + port = lan966x->ports[i];
> +
> + xdp_rxq_info_unreg_mem_model(&port->xdp_rxq);
> + xdp_rxq_info_reg_mem_model(&port->xdp_rxq, MEM_TYPE_PAGE_POOL,
> + rx->page_pool);
> + }
> +
> return PTR_ERR_OR_ZERO(rx->page_pool);
> }
>
> --
> 2.38.0
>

2022-11-23 20:34:58

by Horatiu Vultur

Subject: Re: [PATCH net-next v4 4/7] net: lan966x: Update rxq memory model

The 11/22/2022 23:01, Maciej Fijalkowski wrote:
>
> On Tue, Nov 22, 2022 at 10:44:10PM +0100, Horatiu Vultur wrote:
> > By default the rxq memory model is MEM_TYPE_PAGE_SHARED but to be able
> > to reuse pages on the TX side, when the XDP action XDP_TX it is required
> > to update the memory model to PAGE_POOL.
> >
> > Signed-off-by: Horatiu Vultur <[email protected]>
> > ---
> > .../net/ethernet/microchip/lan966x/lan966x_fdma.c | 14 ++++++++++++++
> > 1 file changed, 14 insertions(+)
> >
> > diff --git a/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
> > index 384ed34197d58..483d1470c8362 100644
> > --- a/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
> > +++ b/drivers/net/ethernet/microchip/lan966x/lan966x_fdma.c
> > @@ -78,8 +78,22 @@ static int lan966x_fdma_rx_alloc_page_pool(struct lan966x_rx *rx)
> > .max_len = rx->max_mtu -
> > SKB_DATA_ALIGN(sizeof(struct skb_shared_info)),
> > };
> > + struct lan966x_port *port;
>
> port can be scoped only for the loop below?

Yes, I will change this.

>
> > + int i;
> >
> > rx->page_pool = page_pool_create(&pp_params);
> > +
> > + for (i = 0; i < lan966x->num_phys_ports; ++i) {
>
> Quoting Alex from some other thread:
>
> "Since we're on -std=gnu11 for a bunch of releases already, all new
> loops are expected to go with the iterator declarations inside them."
>
> TBH I wasn't aware of that personally :)

Me neither, I will update this and all the other lops introduced in this
series.

>
> > + if (!lan966x->ports[i])
> > + continue;
> > +
> > + port = lan966x->ports[i];
> > +
> > + xdp_rxq_info_unreg_mem_model(&port->xdp_rxq);
> > + xdp_rxq_info_reg_mem_model(&port->xdp_rxq, MEM_TYPE_PAGE_POOL,
> > + rx->page_pool);
> > + }
> > +
> > return PTR_ERR_OR_ZERO(rx->page_pool);
> > }
> >
> > --
> > 2.38.0
> >

--
/Horatiu