lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [day] [month] [year] [list]
Message-ID: <20250828160806.84557-1-enjuk@amazon.com>
Date: Fri, 29 Aug 2025 01:08:04 +0900
From: Kohei Enju <enjuk@...zon.com>
To: <pmenzel@...gen.mpg.de>
CC: <andrew+netdev@...n.ch>, <anthony.l.nguyen@...el.com>,
	<davem@...emloft.net>, <edumazet@...gle.com>, <enjuk@...zon.com>,
	<intel-wired-lan@...ts.osuosl.org>, <kohei.enju@...il.com>,
	<kuba@...nel.org>, <netdev@...r.kernel.org>, <pabeni@...hat.com>,
	<przemyslaw.kitszel@...el.com>
Subject: Re: [Intel-wired-lan] [PATCH iwl-next v1] ixgbe: preserve RSS indirection table across admin down/up

On Sun, 24 Aug 2025 20:00:32 +0200, Paul Menzel wrote:

> Dear Kohei,
> 
> 
> Thank you for your patch.
> 
> Am 24.08.25 um 13:20 schrieb Kohei Enju:
> > Currently, the RSS indirection table configured by user via ethtool is
> > reinitialized to default values during interface resets (e.g., admin
> > down/up, MTU change). As for RSS hash key, commit 3dfbfc7ebb95 ("ixgbe:
> > Check for RSS key before setting value") made it persistent across
> > interface resets.
> > 
> > By adopting the same approach used in igc and igb drivers which
> > reinitializes the RSS indirection table only when the queue count
> > changes, let's make user configuration persistent as long as queue count
> > remains unchanged.
> > 
> > Tested on Intel Corporation 82599ES 10-Gigabit SFI/SFP+ Network
> > Connection.
> > 
> > Test:
> > Set custom indirection table and check the value after interface down/up
> > 
> >    # ethtool --set-rxfh-indir ens5 equal 2
> >    # ethtool --show-rxfh-indir ens5 | head -5
> > 
> >    RX flow hash indirection table for ens5 with 12 RX ring(s):
> >        0:      0     1     0     1     0     1     0     1
> >        8:      0     1     0     1     0     1     0     1
> >       16:      0     1     0     1     0     1     0     1
> >    # ip link set dev ens5 down && ip link set dev ens5 up
> > 
> > Without patch:
> >    # ethtool --show-rxfh-indir ens5 | head -5
> > 
> >    RX flow hash indirection table for ens5 with 12 RX ring(s):
> >        0:      0     1     2     3     4     5     6     7
> >        8:      8     9    10    11     0     1     2     3
> >       16:      4     5     6     7     8     9    10    11
> > 
> > With patch:
> >    # ethtool --show-rxfh-indir ens5 | head -5
> > 
> >    RX flow hash indirection table for ens5 with 12 RX ring(s):
> >        0:      0     1     0     1     0     1     0     1
> >        8:      0     1     0     1     0     1     0     1
> >       16:      0     1     0     1     0     1     0     1
> > 
> > Signed-off-by: Kohei Enju <enjuk@...zon.com>
> > ---
> >   drivers/net/ethernet/intel/ixgbe/ixgbe.h      |  1 +
> >   drivers/net/ethernet/intel/ixgbe/ixgbe_main.c | 37 +++++++++++++------
> >   2 files changed, 27 insertions(+), 11 deletions(-)
> > 
> > diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe.h b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
> > index 14d275270123..d8b088c90b05 100644
> > --- a/drivers/net/ethernet/intel/ixgbe/ixgbe.h
> > +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe.h
> > @@ -838,6 +838,7 @@ struct ixgbe_adapter {
> >    */
> >   #define IXGBE_MAX_RETA_ENTRIES 512
> >   	u8 rss_indir_tbl[IXGBE_MAX_RETA_ENTRIES];
> > +	u16 last_rss_i;
> >   
> >   #define IXGBE_RSS_KEY_SIZE     40  /* size of RSS Hash Key in bytes */
> >   	u32 *rss_key;
> > diff --git a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> > index 80e6a2ef1350..dc5a8373b0c3 100644
> > --- a/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> > +++ b/drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
> > @@ -4318,14 +4318,22 @@ static void ixgbe_setup_reta(struct ixgbe_adapter *adapter)
> >   	/* Fill out hash function seeds */
> >   	ixgbe_store_key(adapter);
> >   
> > -	/* Fill out redirection table */
> > -	memset(adapter->rss_indir_tbl, 0, sizeof(adapter->rss_indir_tbl));
> > +	/* Update redirection table in memory on first init or queue count
> > +	 * change, otherwise preserve user configurations. Then always
> > +	 * write to hardware.
> > +	 */
> > +	if (adapter->last_rss_i != rss_i) {
> > +		memset(adapter->rss_indir_tbl, 0,
> > +		       sizeof(adapter->rss_indir_tbl));
> > +
> > +		for (i = 0, j = 0; i < reta_entries; i++, j++) {
> > +			if (j == rss_i)
> > +				j = 0;
> >   
> > -	for (i = 0, j = 0; i < reta_entries; i++, j++) {
> > -		if (j == rss_i)
> > -			j = 0;
> > +			adapter->rss_indir_tbl[i] = j;
> > +		}
> >   
> > -		adapter->rss_indir_tbl[i] = j;
> > +		adapter->last_rss_i = rss_i;
> >   	}
> >   
> >   	ixgbe_store_reta(adapter);
> > @@ -4347,12 +4355,19 @@ static void ixgbe_setup_vfreta(struct ixgbe_adapter *adapter)
> >   					*(adapter->rss_key + i));
> >   	}
> >   
> > -	/* Fill out the redirection table */
> > -	for (i = 0, j = 0; i < 64; i++, j++) {
> > -		if (j == rss_i)
> > -			j = 0;
> > +	/* Update redirection table in memory on first init or queue count
> > +	 * change, otherwise preserve user configurations. Then always
> > +	 * write to hardware.
> > +	 */
> > +	if (adapter->last_rss_i != rss_i) {
> > +		for (i = 0, j = 0; i < 64; i++, j++) {
> > +			if (j == rss_i)
> > +				j = 0;
> > +
> > +			adapter->rss_indir_tbl[i] = j;
> > +		}
> >   
> > -		adapter->rss_indir_tbl[i] = j;
> > +		adapter->last_rss_i = rss_i;
> >   	}
> >   
> >   	ixgbe_store_vfreta(adapter);
> 
> Reviewed-by: Paul Menzel <pmenzel@...gen.mpg.de>

Thank you for reviewing v1, Paul.

I've posted v2 with additional logic to check reta_entries changes.
Since v2 includes a functional change, I haven't carried forward your 
Reviewed-by: tag.

> 
> Kind regards,
> 
> Paul

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ