netdev - RE: [PATCH iwl-next v4 1/3] igb: prepare for RSS key get/set support

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: <PH7PR11MB5983DDDE8A2F05FF51672A7BF389A@PH7PR11MB5983.namprd11.prod.outlook.com>
Date: Tue, 20 Jan 2026 15:26:42 +0000
From: "Kwapulinski, Piotr" <piotr.kwapulinski@...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>, "Loktionov, Aleksandr"
	<aleksandr.loktionov@...el.com>, "pmenzel@...gen.mpg.de"
	<pmenzel@...gen.mpg.de>, "enjuk@...zon.com" <enjuk@...zon.com>
Subject: RE: [PATCH iwl-next v4 1/3] igb: prepare for RSS key get/set support

>-----Original Message-----
>From: Takashi Kozu <takkozu@...zon.com> 
>Sent: Tuesday, January 20, 2026 10:35 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; Loktionov, Aleksandr <aleksandr.loktionov@...el.com>; pmenzel@...gen.mpg.de; Kwapulinski, Piotr <piotr.kwapulinski@...el.com>; enjuk@...zon.com; Takashi Kozu <takkozu@...zon.com>
>Subject: [PATCH iwl-next v4 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().
>
>Signed-off-by: Takashi Kozu <takkozu@...zon.com>
>---
> drivers/net/ethernet/intel/igb/igb.h         |  3 +++
> drivers/net/ethernet/intel/igb/igb_ethtool.c | 21 ++++++++++++++++++++
> drivers/net/ethernet/intel/igb/igb_main.c    |  8 ++++----
> 3 files changed, 28 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 b507576b28b2..a93069b761a6 100644
>--- a/drivers/net/ethernet/intel/igb/igb_ethtool.c
>+++ b/drivers/net/ethernet/intel/igb/igb_ethtool.c
>@@ -3019,6 +3019,27 @@ static int igb_set_rxnfc(struct net_device *dev, struct ethtool_rxnfc *cmd)
> 	return ret;
> }
> 
>+/**
>+ * igb_write_rss_key - Program the RSS key into device registers
>+ * @adapter: board private structure
>+ *
>+ * Write the RSS key stored in adapter->rss_key to the E1000 hardware registers.
>+ * Each 32-bit chunk of the key is read using get_unaligned_le32() and 
>+written
>+ * to the appropriate register.
>+ */
>+void igb_write_rss_key(struct igb_adapter *adapter) {
>+	struct e1000_hw *hw = &adapter->hw;
>+
>+	ASSERT_RTNL();
>+
>+	for (int i = 0; i < IGB_RSS_KEY_SIZE / 4; i++) {
>+		u32 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 dbea37269d2c..c703011b19ec 100644
>--- a/drivers/net/ethernet/intel/igb/igb_main.c
>+++ b/drivers/net/ethernet/intel/igb/igb_main.c
>@@ -4050,6 +4050,9 @@ static int igb_sw_init(struct igb_adapter *adapter)
> 
> 	pci_read_config_word(pdev, PCI_COMMAND, &hw->bus.pci_cmd_word);
> 
>+	/* init RSS key */
>+	netdev_rss_key_fill(adapter->rss_key, sizeof(adapter->rss_key));
>+
> 	/* set default ring sizes */
> 	adapter->tx_ring_count = IGB_DEFAULT_TXD;
> 	adapter->rx_ring_count = IGB_DEFAULT_RXD; @@ -4525,11 +4528,8 @@ 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]);
>+	igb_write_rss_key(adapter);
> 
> 	num_rx_queues = adapter->rss_queues;
> 
>--
>2.52.0
Reviewed-by: Piotr Kwapulinski <piotr.kwapulinski@...el.com>