From: Jakub Kicinski <kuba@kernel.org>
To: Tony Nguyen <anthony.l.nguyen@intel.com>
Cc: davem@davemloft.net, Li RongQing <lirongqing@baidu.com>,
netdev@vger.kernel.org, nhorman@redhat.com, sassmann@redhat.com,
jeffrey.t.kirsher@intel.com,
Andrew Bowers <andrewx.bowers@intel.com>
Subject: Re: [net-next 2/6] i40e: prefetch struct page of Rx buffer conditionally
Date: Tue, 28 Jul 2020 13:14:23 -0700 [thread overview]
Message-ID: <20200728131423.2430b3f1@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> (raw)
In-Reply-To: <20200728190842.1284145-3-anthony.l.nguyen@intel.com>
On Tue, 28 Jul 2020 12:08:38 -0700 Tony Nguyen wrote:
> From: Li RongQing <lirongqing@baidu.com>
>
> page_address() accesses struct page only when WANT_PAGE_VIRTUAL
> or HASHED_PAGE_VIRTUAL is defined, otherwise it returns address
> based on offset, so we prefetch it conditionally
>
> Signed-off-by: Li RongQing <lirongqing@baidu.com>
> Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
> ---
> drivers/net/ethernet/intel/i40e/i40e_txrx.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> index 3e5c566ceb01..5d408fe26063 100644
> --- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> +++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> @@ -1953,7 +1953,9 @@ static struct i40e_rx_buffer *i40e_get_rx_buffer(struct i40e_ring *rx_ring,
> struct i40e_rx_buffer *rx_buffer;
>
> rx_buffer = i40e_rx_bi(rx_ring, rx_ring->next_to_clean);
> +#if defined(WANT_PAGE_VIRTUAL) || defined(HASHED_PAGE_VIRTUAL)
> prefetchw(rx_buffer->page);
> +#endif
Looks like something that belongs in a common header not (potentially
multiple) C sources.
next prev parent reply other threads:[~2020-07-28 20:14 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-28 19:08 [net-next 0/6][pull request] 40GbE Intel Wired LAN Driver Updates 2020-07-28 Tony Nguyen
2020-07-28 19:08 ` [net-next 1/6] i40e: not compute affinity_mask for IRQ Tony Nguyen
2020-07-28 19:08 ` [net-next 2/6] i40e: prefetch struct page of Rx buffer conditionally Tony Nguyen
2020-07-28 20:14 ` Jakub Kicinski [this message]
2020-07-29 6:20 ` 答复: " Li,Rongqing
2020-07-29 21:20 ` Jakub Kicinski
2020-07-30 1:15 ` 答复: " Li,Rongqing
2020-07-28 19:08 ` [net-next 3/6] i40e, xsk: remove HW descriptor prefetch in AF_XDP path Tony Nguyen
2020-07-28 19:08 ` [net-next 4/6] i40e: use 16B HW descriptors instead of 32B Tony Nguyen
2020-07-28 19:08 ` [net-next 5/6] i40e, xsk: increase budget for AF_XDP path Tony Nguyen
2020-07-28 20:15 ` Jakub Kicinski
2020-07-29 10:43 ` Björn Töpel
2020-07-29 21:22 ` Jakub Kicinski
2020-07-28 19:08 ` [net-next 6/6] i40e, xsk: move buffer allocation out of the Rx processing loop Tony Nguyen
2020-07-28 20:16 ` [net-next 0/6][pull request] 40GbE Intel Wired LAN Driver Updates 2020-07-28 Jakub Kicinski
2020-08-10 11:47 ` Björn Töpel
2020-08-10 11:51 ` Björn Töpel
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