netdev - RE: [Intel-wired-lan] [PATCH iwl-next v2 1/3] igb: prepare for RSS key get/set support

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Message-ID: <IA3PR11MB8986E72CF8AB3E302D1296CAE582A@IA3PR11MB8986.namprd11.prod.outlook.com>
Date: Fri, 9 Jan 2026 05:59:24 +0000
From: "Loktionov, Aleksandr" <aleksandr.loktionov@...el.com>
To: Takashi Kozu <takkozu@...zon.com>, "Nguyen, Anthony L"
	<anthony.l.nguyen@...el.com>
CC: "Kitszel, Przemyslaw" <przemyslaw.kitszel@...el.com>,
	"andrew+netdev@...n.ch" <andrew+netdev@...n.ch>, "davem@...emloft.net"
	<davem@...emloft.net>, "edumazet@...gle.com" <edumazet@...gle.com>,
	"kuba@...nel.org" <kuba@...nel.org>, "pabeni@...hat.com" <pabeni@...hat.com>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>, Kohei Enju
	<enjuk@...zon.com>
Subject: RE: [Intel-wired-lan] [PATCH iwl-next v2 1/3] igb: prepare for RSS
 key get/set support



> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf
> Of Takashi Kozu
> Sent: Thursday, January 8, 2026 6:20 AM
> To: Nguyen, Anthony L <anthony.l.nguyen@...el.com>
> Cc: Kitszel, Przemyslaw <przemyslaw.kitszel@...el.com>;
> andrew+netdev@...n.ch; davem@...emloft.net; edumazet@...gle.com;
> kuba@...nel.org; pabeni@...hat.com; intel-wired-lan@...ts.osuosl.org;
> netdev@...r.kernel.org; Takashi Kozu <takkozu@...zon.com>; Kohei Enju
> <enjuk@...zon.com>
> Subject: [Intel-wired-lan] [PATCH iwl-next v2 1/3] igb: prepare for
> RSS key get/set support
> 
> Store the RSS key inside struct igb_adapter and introduce the
> igb_write_rss_key() helper function. This allows the driver to program
> the E1000 registers using a persistent RSS key, instead of using a
> stack-local buffer in igb_setup_mrqc().
> 
> Tested-by: Kohei Enju <enjuk@...zon.com>
> Signed-off-by: Takashi Kozu <takkozu@...zon.com>
> ---
>  drivers/net/ethernet/intel/igb/igb.h         |  3 +++
>  drivers/net/ethernet/intel/igb/igb_ethtool.c | 12 ++++++++++++
>  drivers/net/ethernet/intel/igb/igb_main.c    |  6 ++----
>  3 files changed, 17 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/ethernet/intel/igb/igb.h
> b/drivers/net/ethernet/intel/igb/igb.h
> index 0fff1df81b7b..8c9b02058cec 100644
> --- a/drivers/net/ethernet/intel/igb/igb.h
> +++ b/drivers/net/ethernet/intel/igb/igb.h
> @@ -495,6 +495,7 @@ struct hwmon_buff {
>  #define IGB_N_PEROUT	2
>  #define IGB_N_SDP	4
>  #define IGB_RETA_SIZE	128
> +#define IGB_RSS_KEY_SIZE	40
> 
>  enum igb_filter_match_flags {
>  	IGB_FILTER_FLAG_ETHER_TYPE = 0x1,
> @@ -655,6 +656,7 @@ struct igb_adapter {
>  	struct i2c_client *i2c_client;
>  	u32 rss_indir_tbl_init;
>  	u8 rss_indir_tbl[IGB_RETA_SIZE];
> +	u8 rss_key[IGB_RSS_KEY_SIZE];
> 
>  	unsigned long link_check_timeout;
>  	int copper_tries;
> @@ -735,6 +737,7 @@ void igb_down(struct igb_adapter *);  void
> igb_reinit_locked(struct igb_adapter *);  void igb_reset(struct
> igb_adapter *);  int igb_reinit_queues(struct igb_adapter *);
> +void igb_write_rss_key(struct igb_adapter *adapter);
>  void igb_write_rss_indir_tbl(struct igb_adapter *);  int
> igb_set_spd_dplx(struct igb_adapter *, u32, u8);  int
> igb_setup_tx_resources(struct igb_ring *); diff --git
> a/drivers/net/ethernet/intel/igb/igb_ethtool.c
> b/drivers/net/ethernet/intel/igb/igb_ethtool.c
> index 10e2445e0ded..8695ff28a7b8 100644
> --- a/drivers/net/ethernet/intel/igb/igb_ethtool.c
> +++ b/drivers/net/ethernet/intel/igb/igb_ethtool.c
> @@ -3016,6 +3016,18 @@ static int igb_set_rxnfc(struct net_device
> *dev, struct ethtool_rxnfc *cmd)
>  	return ret;
>  }
> 
> +void igb_write_rss_key(struct igb_adapter *adapter) {
> +	struct e1000_hw *hw = &adapter->hw;
> +	u32 val;
> +	int i;
> +
> +	for (i = 0; i < IGB_RSS_KEY_SIZE / 4; i++) {
> +		val = get_unaligned_le32(&adapter->rss_key[i * 4]);
> +		wr32(E1000_RSSRK(i), val);
> +	}
> +}
> +
>  static int igb_get_eee(struct net_device *netdev, struct ethtool_keee
> *edata)  {
>  	struct igb_adapter *adapter = netdev_priv(netdev); diff --git
> a/drivers/net/ethernet/intel/igb/igb_main.c
> b/drivers/net/ethernet/intel/igb/igb_main.c
> index 85f9589cc568..da0f550de605 100644
> --- a/drivers/net/ethernet/intel/igb/igb_main.c
> +++ b/drivers/net/ethernet/intel/igb/igb_main.c
> @@ -4525,11 +4525,9 @@ static void igb_setup_mrqc(struct igb_adapter
> *adapter)
>  	struct e1000_hw *hw = &adapter->hw;
>  	u32 mrqc, rxcsum;
>  	u32 j, num_rx_queues;
> -	u32 rss_key[10];
> 
> -	netdev_rss_key_fill(rss_key, sizeof(rss_key));
> -	for (j = 0; j < 10; j++)
> -		wr32(E1000_RSSRK(j), rss_key[j]);
> +	netdev_rss_key_fill(adapter->rss_key, sizeof(adapter-
> >rss_key));
> +	igb_write_rss_key(adapter);
> 
>  	num_rx_queues = adapter->rss_queues;
> 
> --
> 2.52.0

Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>