[PATCH net-next v2 0/3][pull request] 40GbE Intel Wired LAN Driver Updates 2021-10-29

This series contains updates to i40e, ice, igb, and ixgbevf drivers.

Yang Li simplifies return statements of bool values for i40e and ice.

Jan Kundrát corrects problems with I2C bit-banging for igb.

Colin Ian King removes unneeded variable initialization for ixgbevf.
---
v2: Dropped patch 1; awaiting changes from author

The following are changes since commit 7444d706be31753f65052c7f6325fc8470cc1789:
  ifb: fix building without CONFIG_NET_CLS_ACT
and are available in the git repository at:
  git://git.kernel.org/pub/scm/linux/kernel/git/tnguy/next-queue 40GbE

Colin Ian King (1):
  net: ixgbevf: Remove redundant initialization of variable ret_val

Jan Kundrát (1):
  igb: unbreak I2C bit-banging on i350

Yang Li (1):
  intel: Simplify bool conversion

 drivers/net/ethernet/intel/i40e/i40e_xsk.c |  2 +-
 drivers/net/ethernet/intel/ice/ice_xsk.c   |  2 +-
 drivers/net/ethernet/intel/igb/igb_main.c  | 23 ++++++++++++++--------
 drivers/net/ethernet/intel/ixgbevf/vf.c    |  2 +-
 4 files changed, 18 insertions(+), 11 deletions(-)

-- 
2.31.1

From: Yang Li <redacted>

Fix the following coccicheck warning:
./drivers/net/ethernet/intel/i40e/i40e_xsk.c:229:35-40: WARNING:
conversion to bool not needed here
./drivers/net/ethernet/intel/ice/ice_xsk.c:399:35-40: WARNING:
conversion to bool not needed here

Reported-by: Abaci Robot <redacted>
Signed-off-by: Yang Li <redacted>
Tested-by: Tony Brelinski <redacted>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_xsk.c | 2 +-
 drivers/net/ethernet/intel/ice/ice_xsk.c   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_xsk.c b/drivers/net/ethernet/intel/i40e/i40e_xsk.c
index 6f85879ba993..ea06e957393e 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_xsk.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_xsk.c

@@ -226,7 +226,7 @@ bool i40e_alloc_rx_buffers_zc(struct i40e_ring *rx_ring, u16 count)
 	rx_desc->wb.qword1.status_error_len = 0;
 	i40e_release_rx_desc(rx_ring, ntu);
 
-	return count == nb_buffs ? true : false;
+	return count == nb_buffs;
 }
 
 /**

diff --git a/drivers/net/ethernet/intel/ice/ice_xsk.c b/drivers/net/ethernet/intel/ice/ice_xsk.c
index d9dfcfc2c6f9..ff55cb415b11 100644
--- a/drivers/net/ethernet/intel/ice/ice_xsk.c
+++ b/drivers/net/ethernet/intel/ice/ice_xsk.c

@@ -399,7 +399,7 @@ bool ice_alloc_rx_bufs_zc(struct ice_rx_ring *rx_ring, u16 count)
 	rx_desc->wb.status_error0 = 0;
 	ice_release_rx_desc(rx_ring, ntu);
 
-	return count == nb_buffs ? true : false;
+	return count == nb_buffs;
 }
 
 /**

-- 
2.31.1

From: Jan Kundrát <redacted>

The driver tried to use Linux' native software I2C bus master
(i2c-algo-bits) for exporting the I2C interface that talks to the SFP
cage(s) towards userspace. As-is, however, the physical SCL/SDA pins
were not moving at all, staying at logical 1 all the time.

The main culprit was the I2CPARAMS register where igb was not setting
the I2CBB_EN bit. That meant that all the careful signal bit-banging was
actually not being propagated to the chip pads (I verified this with a
scope).

The bit-banging was not correct either, because I2C is supposed to be an
open-collector bus, and the code was driving both lines via a totem
pole. The code was also trying to do operations which did not make any
sense with the i2c-algo-bits, namely manipulating both SDA and SCL from
igb_set_i2c_data (which is only supposed to set SDA). I'm not sure if
that was meant as an optimization, or was just flat out wrong, but given
that the i2c-algo-bits is set up to work with a totally dumb GPIO-ish
implementation underneath, there's no need for this code to be smart.

The open-drain vs. totem-pole is fixed by the usual trick where the
logical zero is implemented via regular output mode and outputting a
logical 0, and the logical high is implemented via the IO pad configured
as an input (thus floating), and letting the mandatory pull-up resistors
do the rest. Anything else is actually wrong on I2C where all devices
are supposed to have open-drain connection to the bus.

The missing I2CBB_EN is set (along with a safe initial value of the
GPIOs) just before registering this software I2C bus.

The chip datasheet mentions HW-implemented I2C transactions (SFP EEPROM
reads and writes) as well, but I'm not touching these for simplicity.

Tested on a LR-Link LRES2203PF-2SFP (which is an almost-miniPCIe form
factor card, a cable, and a module with two SFP cages). There was one
casualty, an old broken SFP we had laying around, which was used to
solder some thin wires as a DIY I2C breakout. Thanks for your service.
With this patch in place, I can `i2cdump -y 3 0x51 c` and read back data
which make sense. Yay.

Signed-off-by: Jan Kundrát <redacted>
See-also: https://www.spinics.net/lists/netdev/msg490554.html
Reviewed-by: Jesse Brandeburg <redacted>
Tested-by: Tony Brelinski <redacted>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/igb/igb_main.c | 23 +++++++++++++++--------
 1 file changed, 15 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index e67a71c3f141..836be0d3b291 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c

@@ -577,16 +577,15 @@ static void igb_set_i2c_data(void *data, int state)
 	struct e1000_hw *hw = &adapter->hw;
 	s32 i2cctl = rd32(E1000_I2CPARAMS);
 
-	if (state)
-		i2cctl |= E1000_I2C_DATA_OUT;
-	else
+	if (state) {
+		i2cctl |= E1000_I2C_DATA_OUT | E1000_I2C_DATA_OE_N;
+	} else {
+		i2cctl &= ~E1000_I2C_DATA_OE_N;
 		i2cctl &= ~E1000_I2C_DATA_OUT;
+	}
 
-	i2cctl &= ~E1000_I2C_DATA_OE_N;
-	i2cctl |= E1000_I2C_CLK_OE_N;
 	wr32(E1000_I2CPARAMS, i2cctl);
 	wrfl();
-
 }
 
 /**

@@ -603,8 +602,7 @@ static void igb_set_i2c_clk(void *data, int state)
 	s32 i2cctl = rd32(E1000_I2CPARAMS);
 
 	if (state) {
-		i2cctl |= E1000_I2C_CLK_OUT;
-		i2cctl &= ~E1000_I2C_CLK_OE_N;
+		i2cctl |= E1000_I2C_CLK_OUT | E1000_I2C_CLK_OE_N;
 	} else {
 		i2cctl &= ~E1000_I2C_CLK_OUT;
 		i2cctl &= ~E1000_I2C_CLK_OE_N;

@@ -3116,12 +3114,21 @@ static void igb_init_mas(struct igb_adapter *adapter)
  **/
 static s32 igb_init_i2c(struct igb_adapter *adapter)
 {
+	struct e1000_hw *hw = &adapter->hw;
 	s32 status = 0;
+	s32 i2cctl;
 
 	/* I2C interface supported on i350 devices */
 	if (adapter->hw.mac.type != e1000_i350)
 		return 0;
 
+	i2cctl = rd32(E1000_I2CPARAMS);
+	i2cctl |= E1000_I2CBB_EN
+		| E1000_I2C_CLK_OUT | E1000_I2C_CLK_OE_N
+		| E1000_I2C_DATA_OUT | E1000_I2C_DATA_OE_N;
+	wr32(E1000_I2CPARAMS, i2cctl);
+	wrfl();
+
 	/* Initialize the i2c bus which is controlled by the registers.
 	 * This bus will use the i2c_algo_bit structure that implements
 	 * the protocol through toggling of the 4 bits in the register.

-- 
2.31.1

From: Colin Ian King <redacted>

The variable ret_val is being initialized with a value that is never
read, it is being updated later on. The assignment is redundant and
can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <redacted>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/ixgbevf/vf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/ixgbevf/vf.c b/drivers/net/ethernet/intel/ixgbevf/vf.c
index 5fc347abab3c..d459f5c8e98f 100644
--- a/drivers/net/ethernet/intel/ixgbevf/vf.c
+++ b/drivers/net/ethernet/intel/ixgbevf/vf.c

@@ -66,9 +66,9 @@ static s32 ixgbevf_reset_hw_vf(struct ixgbe_hw *hw)
 {
 	struct ixgbe_mbx_info *mbx = &hw->mbx;
 	u32 timeout = IXGBE_VF_INIT_TIMEOUT;
-	s32 ret_val = IXGBE_ERR_INVALID_MAC_ADDR;
 	u32 msgbuf[IXGBE_VF_PERMADDR_MSG_LEN];
 	u8 *addr = (u8 *)(&msgbuf[1]);
+	s32 ret_val;
 
 	/* Call adapter stop to disable tx/rx and clear interrupts */
 	hw->mac.ops.stop_adapter(hw);

-- 
2.31.1

Hello:

This series was applied to netdev/net-next.git (master)
by Tony Nguyen [off-list ref]:

On Fri, 29 Oct 2021 09:46:38 -0700 you wrote:

This series contains updates to i40e, ice, igb, and ixgbevf drivers.

Yang Li simplifies return statements of bool values for i40e and ice.

Jan Kundrát corrects problems with I2C bit-banging for igb.

Colin Ian King removes unneeded variable initialization for ixgbevf.

[...]

Here is the summary with links:
  - [net-next,v2,1/3] intel: Simplify bool conversion
    https://git.kernel.org/netdev/net-next/c/3c6f3ae3bb2e
  - [net-next,v2,2/3] igb: unbreak I2C bit-banging on i350
    https://git.kernel.org/netdev/net-next/c/a97f8783a937
  - [net-next,v2,3/3] net: ixgbevf: Remove redundant initialization of variable ret_val
    https://git.kernel.org/netdev/net-next/c/1b9abade3e75

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html