[PATCH net-next 0/3][pull request] 40GbE Intel Wired LAN Driver Updates 2022-06-21

[PATCH net-next 0/3][pull request] 40GbE Intel Wired LAN Driver Updates 2022-06-21

[Tony Nguyen]

This series contains updates to i40e driver only.

Mateusz adds support for using the speed option in ethtool.

Minghao Chi removes unneeded synchronize_irq() calls.

Bernard Zhao removes unneeded NULL check.

The following are changes since commit 8720bd951b8e8515ffd995c7631790fdabaa9265:
  Merge branch 'net-dsa-microchip-common-spi-probe-for-the-ksz-series-switches-part-1'
and are available in the git repository at:
  git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue 40GbE

Bernard Zhao (1):
  intel/i40e: delete if NULL check before dev_kfree_skb

Mateusz Palczewski (1):
  i40e: Add support for ethtool -s <interface> speed <speed in Mb>

Minghao Chi (1):
  i40e: Remove unnecessary synchronize_irq() before free_irq()

 .../net/ethernet/intel/i40e/i40e_ethtool.c    | 90 +++++++++++++++++++
 drivers/net/ethernet/intel/i40e/i40e_main.c   |  2 -
 drivers/net/ethernet/intel/i40e/i40e_txrx.c   |  6 +-
 3 files changed, 92 insertions(+), 6 deletions(-)

-- 
2.35.1

[PATCH net-next 1/3] i40e: Add support for ethtool -s <interface> speed <speed in Mb>

[Tony Nguyen]

From: Mateusz Palczewski <mateusz.palczewski@intel.com>

Add ability to change speed through ethtool -s <interface> speed <speed in Mb>
Driver advertises all link modes that support requested speed.
Autoneg must be set off e.g.:
	ethtool -s <interface> autoneg off speed <speed in Mb>.

Add helper function that translate speed in Mb to
enum i40e_aq_link_speed and compare it to supported speeds from
given ethtool_link_ksettings. Add in i40e_set_link_ksettings hold
for requested speed and set copy_ks.base.speed to safe_ks.base.speed
to be sure that user is not changing unsupported setting.
In i40e_speed_to_link_speed compare requested speed with supported
speeds. Set speed to requested speed.

Signed-off-by: Norbert Zulinski <norbertx.zulinski@intel.com>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@intel.com>
Tested-by: Dave Switzer <david.switzer@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 .../net/ethernet/intel/i40e/i40e_ethtool.c    | 90 +++++++++++++++++++
 1 file changed, 90 insertions(+)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
index 552aad6ae1ca..55841816272b 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_ethtool.c
@@ -1143,6 +1143,71 @@ static int i40e_get_link_ksettings(struct net_device *netdev,
 	return 0;
 }
 
+#define I40E_LBIT_SIZE 8
+/**
+ * i40e_speed_to_link_speed - Translate decimal speed to i40e_aq_link_speed
+ * @speed: speed in decimal
+ * @ks: ethtool ksettings
+ *
+ * Return i40e_aq_link_speed based on speed
+ **/
+static enum i40e_aq_link_speed
+i40e_speed_to_link_speed(__u32 speed, const struct ethtool_link_ksettings *ks)
+{
+	enum i40e_aq_link_speed link_speed = I40E_LINK_SPEED_UNKNOWN;
+	bool speed_changed = false;
+	int i, j;
+
+	static const struct {
+		__u32 speed;
+		enum i40e_aq_link_speed link_speed;
+		__u8 bit[I40E_LBIT_SIZE];
+	} i40e_speed_lut[] = {
+#define I40E_LBIT(mode) ETHTOOL_LINK_MODE_ ## mode ##_Full_BIT
+		{SPEED_100, I40E_LINK_SPEED_100MB, {I40E_LBIT(100baseT)} },
+		{SPEED_1000, I40E_LINK_SPEED_1GB,
+		 {I40E_LBIT(1000baseT), I40E_LBIT(1000baseX),
+		  I40E_LBIT(1000baseKX)} },
+		{SPEED_10000, I40E_LINK_SPEED_10GB,
+		 {I40E_LBIT(10000baseT), I40E_LBIT(10000baseKR),
+		  I40E_LBIT(10000baseLR), I40E_LBIT(10000baseCR),
+		  I40E_LBIT(10000baseSR), I40E_LBIT(10000baseKX4)} },
+
+		{SPEED_25000, I40E_LINK_SPEED_25GB,
+		 {I40E_LBIT(25000baseCR), I40E_LBIT(25000baseKR),
+		  I40E_LBIT(25000baseSR)} },
+		{SPEED_40000, I40E_LINK_SPEED_40GB,
+		 {I40E_LBIT(40000baseKR4), I40E_LBIT(40000baseCR4),
+		  I40E_LBIT(40000baseSR4), I40E_LBIT(40000baseLR4)} },
+		{SPEED_20000, I40E_LINK_SPEED_20GB,
+		 {I40E_LBIT(20000baseKR2)} },
+		{SPEED_2500, I40E_LINK_SPEED_2_5GB, {I40E_LBIT(2500baseT)} },
+		{SPEED_5000, I40E_LINK_SPEED_5GB, {I40E_LBIT(2500baseT)} }
+#undef I40E_LBIT
+};
+
+	for (i = 0; i < ARRAY_SIZE(i40e_speed_lut); i++) {
+		if (i40e_speed_lut[i].speed == speed) {
+			for (j = 0; j < I40E_LBIT_SIZE; j++) {
+				if (test_bit(i40e_speed_lut[i].bit[j],
+					     ks->link_modes.supported)) {
+					speed_changed = true;
+					break;
+				}
+				if (!i40e_speed_lut[i].bit[j])
+					break;
+			}
+			if (speed_changed) {
+				link_speed = i40e_speed_lut[i].link_speed;
+				break;
+			}
+		}
+	}
+	return link_speed;
+}
+
+#undef I40E_LBIT_SIZE
+
 /**
  * i40e_set_link_ksettings - Set Speed and Duplex
  * @netdev: network interface device structure
@@ -1159,12 +1224,14 @@ static int i40e_set_link_ksettings(struct net_device *netdev,
 	struct ethtool_link_ksettings copy_ks;
 	struct i40e_aq_set_phy_config config;
 	struct i40e_pf *pf = np->vsi->back;
+	enum i40e_aq_link_speed link_speed;
 	struct i40e_vsi *vsi = np->vsi;
 	struct i40e_hw *hw = &pf->hw;
 	bool autoneg_changed = false;
 	i40e_status status = 0;
 	int timeout = 50;
 	int err = 0;
+	__u32 speed;
 	u8 autoneg;
 
 	/* Changing port settings is not supported if this isn't the
@@ -1197,6 +1264,7 @@ static int i40e_set_link_ksettings(struct net_device *netdev,
 
 	/* save autoneg out of ksettings */
 	autoneg = copy_ks.base.autoneg;
+	speed = copy_ks.base.speed;
 
 	/* get our own copy of the bits to check against */
 	memset(&safe_ks, 0, sizeof(struct ethtool_link_ksettings));
@@ -1215,6 +1283,7 @@ static int i40e_set_link_ksettings(struct net_device *netdev,
 
 	/* set autoneg back to what it currently is */
 	copy_ks.base.autoneg = safe_ks.base.autoneg;
+	copy_ks.base.speed  = safe_ks.base.speed;
 
 	/* If copy_ks.base and safe_ks.base are not the same now, then they are
 	 * trying to set something that we do not support.
@@ -1331,6 +1400,27 @@ static int i40e_set_link_ksettings(struct net_device *netdev,
 						  40000baseLR4_Full))
 		config.link_speed |= I40E_LINK_SPEED_40GB;
 
+	/* Autonegotiation must be disabled to change speed */
+	if ((speed != SPEED_UNKNOWN && safe_ks.base.speed != speed) &&
+	    (autoneg == AUTONEG_DISABLE ||
+	    (safe_ks.base.autoneg == AUTONEG_DISABLE && !autoneg_changed))) {
+		link_speed = i40e_speed_to_link_speed(speed, ks);
+		if (link_speed == I40E_LINK_SPEED_UNKNOWN) {
+			netdev_info(netdev, "Given speed is not supported\n");
+			err = -EOPNOTSUPP;
+			goto done;
+		} else {
+			config.link_speed = link_speed;
+		}
+	} else {
+		if (safe_ks.base.speed != speed) {
+			netdev_info(netdev,
+				    "Unable to set speed, disable autoneg\n");
+			err = -EOPNOTSUPP;
+			goto done;
+		}
+	}
+
 	/* If speed didn't get set, set it to what it currently is.
 	 * This is needed because if advertise is 0 (as it is when autoneg
 	 * is disabled) then speed won't get set.
-- 
2.35.1

[PATCH net-next 2/3] i40e: Remove unnecessary synchronize_irq() before free_irq()

[Tony Nguyen]

From: Minghao Chi <chi.minghao@zte.com.cn>

Calling synchronize_irq() right before free_irq() is quite useless. On one
hand the IRQ can easily fire again before free_irq() is entered, on the
other hand free_irq() itself calls synchronize_irq() internally (in a race
condition free way), before any state associated with the IRQ is freed.

Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: Minghao Chi <chi.minghao@zte.com.cn>
Tested-by: Gurucharan <gurucharanx.g@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 83e0cf475ebd..797f61b2cd96 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -4162,7 +4162,6 @@ static void i40e_free_misc_vector(struct i40e_pf *pf)
 	i40e_flush(&pf->hw);
 
 	if (pf->flags & I40E_FLAG_MSIX_ENABLED && pf->msix_entries) {
-		synchronize_irq(pf->msix_entries[0].vector);
 		free_irq(pf->msix_entries[0].vector, pf);
 		clear_bit(__I40E_MISC_IRQ_REQUESTED, pf->state);
 	}
@@ -4901,7 +4900,6 @@ static void i40e_vsi_free_irq(struct i40e_vsi *vsi)
 			irq_set_affinity_notifier(irq_num, NULL);
 			/* remove our suggested affinity mask for this IRQ */
 			irq_update_affinity_hint(irq_num, NULL);
-			synchronize_irq(irq_num);
 			free_irq(irq_num, vsi->q_vectors[i]);
 
 			/* Tear down the interrupt queue link list
-- 
2.35.1

[PATCH net-next 3/3] intel/i40e: delete if NULL check before dev_kfree_skb

[Tony Nguyen]

From: Bernard Zhao <zhaojunkui2008@126.com>

dev_kfree_skb check if the input parameter NULL and do the right
thing, there is no need to check again.
This change is to cleanup the code a bit.

Signed-off-by: Bernard Zhao <zhaojunkui2008@126.com>
Tested-by: Gurucharan <gurucharanx.g@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_txrx.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
index b7967105a549..dadef56e5f9b 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
@@ -1483,10 +1483,8 @@ void i40e_clean_rx_ring(struct i40e_ring *rx_ring)
 	if (!rx_ring->rx_bi)
 		return;
 
-	if (rx_ring->skb) {
-		dev_kfree_skb(rx_ring->skb);
-		rx_ring->skb = NULL;
-	}
+	dev_kfree_skb(rx_ring->skb);
+	rx_ring->skb = NULL;
 
 	if (rx_ring->xsk_pool) {
 		i40e_xsk_clean_rx_ring(rx_ring);
-- 
2.35.1

Re: [PATCH net-next 0/3][pull request] 40GbE Intel Wired LAN Driver Updates 2022-06-21

[patchwork-bot+netdevbpf]

Hello:

This series was applied to netdev/net-next.git (master)
by Tony Nguyen <anthony.l.nguyen@intel.com>:

On Tue, 21 Jun 2022 15:59:27 -0700 you wrote:
> This series contains updates to i40e driver only.
> 
> Mateusz adds support for using the speed option in ethtool.
> 
> Minghao Chi removes unneeded synchronize_irq() calls.
> 
> Bernard Zhao removes unneeded NULL check.
> 
> [...]

Here is the summary with links:
  - [net-next,1/3] i40e: Add support for ethtool -s <interface> speed <speed in Mb>
    https://git.kernel.org/netdev/net-next/c/7f72d923149c
  - [net-next,2/3] i40e: Remove unnecessary synchronize_irq() before free_irq()
    https://git.kernel.org/netdev/net-next/c/3e0fcb782a9f
  - [net-next,3/3] intel/i40e: delete if NULL check before dev_kfree_skb
    https://git.kernel.org/netdev/net-next/c/56878d49cc26

You are awesome, thank you!
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