Hi Jia,
The change in commit:b826efba6de4 does follow the x540 datasheet, but is not
consistent with the latest ixgbe kernel driver(v5.10.2).
In ixgbe_main.c(kernel driver), there are the following code, without any
precondition. I think the author think NFS packet shall not be filtered in any
condition.
/**
* ixgbe_configure_rx - Configure 8259x Receive Unit after Reset
* @adapter: board private structure
*
* Configure the Rx unit of the MAC after a reset.
**/
static void ixgbe_configure_rx(struct ixgbe_adapter *adapter)
{
...
/* RSC Setup */
rfctl = IXGBE_READ_REG(hw, IXGBE_RFCTL);
rfctl &= ~IXGBE_RFCTL_RSC_DIS;
if (!(adapter->flags2 & IXGBE_FLAG2_RSC_ENABLED))
rfctl |= IXGBE_RFCTL_RSC_DIS;
/* disable NFS filtering */
rfctl |= (IXGBE_RFCTL_NFSW_DIS | IXGBE_RFCTL_NFSR_DIS);
IXGBE_WRITE_REG(hw, IXGBE_RFCTL, rfctl);
...
}
I cannot find the complete modification history of these code lines in kernel
driver. But these line is introduced in ixgbe 4.5.4(2016-12-13), and never
changed later.
I bring this change because NFS packet will be filtered without it, the result
is that all NFS packets flow into queue0, before RSS can work on it.
Thanks for your suggestions on this patch, I will submit patch v2 to include
them.
-----Original Message-----
From: Guo, Jia
Sent: Friday, January 22, 2021 1:34 PM
To: Yu, DapengX <[email protected]>; Wang, Haiyue <[email protected]>;
Yang, Qiming <[email protected]>
Cc: [email protected]; Yu, DapengX <[email protected]>; [email protected]
Subject: RE: [PATCH] net/ixgbe: disable NFS filtering
Hi, dapeng
> -----Original Message-----
> From: [email protected] <[email protected]>
> Sent: Wednesday, January 20, 2021 5:27 PM
> To: Guo, Jia <[email protected]>; Wang, Haiyue
> <[email protected]>; Yang, Qiming <[email protected]>
> Cc: [email protected]; Yu, DapengX <[email protected]>; [email protected]
> Subject: [PATCH] net/ixgbe: disable NFS filtering
>
> From: Dapeng Yu <[email protected]>
>
> Disable NFS header filtering whether NFS packets coalescing are
> required or not.
>
> This behavior is aligned with ixgbe kernel driver.
>
> Fixes: b826efba6de4 ("net/ixgbe: align register setting when RSC is
> disabled")
I suggest to add one more fix line which related with the patch, since below
patch is what you most change the behaviors.
the Fixes: 8eecb3295aed ("ixgbe: add LRO support ")
And I saw prior fixed patch are also said it would flow the datasheet, could
you explain why you bring this change? Is it anything change about that in
kernel driver prior with currently?
> Cc: [email protected]
>
> Signed-off-by: Dapeng Yu <[email protected]>
> ---
> drivers/net/ixgbe/ixgbe_rxtx.c | 10 +++-------
> 1 file changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/net/ixgbe/ixgbe_rxtx.c
> b/drivers/net/ixgbe/ixgbe_rxtx.c index cc8f70e6d..3fb55c675 100644
> --- a/drivers/net/ixgbe/ixgbe_rxtx.c
> +++ b/drivers/net/ixgbe/ixgbe_rxtx.c
> @@ -4923,15 +4923,11 @@ ixgbe_set_rsc(struct rte_eth_dev *dev)
> /* RFCTL configuration */
> rfctl = IXGBE_READ_REG(hw, IXGBE_RFCTL);
> if ((rsc_capable) && (rx_conf->offloads &
> DEV_RX_OFFLOAD_TCP_LRO))
> - /*
> - * Since NFS packets coalescing is not supported - clear
> - * RFCTL.NFSW_DIS and RFCTL.NFSR_DIS when RSC is
> - * enabled.
> - */
> - rfctl &= ~(IXGBE_RFCTL_RSC_DIS | IXGBE_RFCTL_NFSW_DIS
> |
> - IXGBE_RFCTL_NFSR_DIS);
> + rfctl &= ~IXGBE_RFCTL_RSC_DIS;
> else
> rfctl |= IXGBE_RFCTL_RSC_DIS;
> + /* disable NFS filtering */
> + rfctl |= (IXGBE_RFCTL_NFSW_DIS | IXGBE_RFCTL_NFSR_DIS);
I thinks the "()" is no need, right?
> IXGBE_WRITE_REG(hw, IXGBE_RFCTL, rfctl);
>
> /* If LRO hasn't been requested - we are done here. */
> --
> 2.27.0
