netdev - Re: [PATCH net-next] i40e: xsk: read the XDP program once per NAPI

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Date:   Wed, 22 Jun 2022 17:35:16 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Ciara Loftus <ciara.loftus@...el.com>
Cc:     intel-wired-lan@...ts.osuosl.org, anthony.l.nguyen@...el.com,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        magnus.karlsson@...el.com, maciej.fijalkowski@...el.com
Subject: Re: [PATCH net-next] i40e: xsk: read the XDP program once per NAPI

On Wed, 22 Jun 2022 09:14:47 +0000 Ciara Loftus wrote:
> Similar to how it's done in the ice driver since 'eb087cd82864 ("ice:
> propagate xdp_ring onto rx_ring")', read the XDP program once per NAPI
> instead of once per descriptor cleaned. I measured an improvement in
> throughput of 2% for the AF_XDP xdpsock l2fwd benchmark in busy polling
> mode on my platform.

drivers/net/ethernet/intel/i40e/i40e_xsk.c:151: warning: Function parameter or member 'xdp_prog' not described in 'i40e_run_xdp_zc'