kernel: backport eth_addr_add()

It's required by upcoming NVMEM layout drivers.

Signed-off-by: Rafał Miłecki <[email protected]>

target/linux/ath79/patches-5.10/910-unaligned_access_hacks.patch

@@ -833,7 +833,7 @@ SVN-Revision: 35130
  		*sum = csum_fold(csum_partial(diff, sizeof(diff),
 --- a/include/linux/etherdevice.h
 +++ b/include/linux/etherdevice.h
-@@ -499,7 +499,7 @@ static inline bool is_etherdev_addr(cons
+@@ -513,7 +513,7 @@ static inline bool is_etherdev_addr(cons
   * @b: Pointer to Ethernet header
   *
   * Compare two Ethernet headers, returns 0 if equal.
@@ -842,7 +842,7 @@ SVN-Revision: 35130
   * aligned OR the platform can handle unaligned access.  This is the
   * case for all packets coming into netif_receive_skb or similar
   * entry points.
-@@ -522,11 +522,12 @@ static inline unsigned long compare_ethe
+@@ -536,11 +536,12 @@ static inline unsigned long compare_ethe
  	fold |= *(unsigned long *)(a + 6) ^ *(unsigned long *)(b + 6);
  	return fold;
  #else

target/linux/ath79/patches-5.15/910-unaligned_access_hacks.patch

@@ -829,7 +829,7 @@ SVN-Revision: 35130
  		*sum = csum_fold(csum_partial(diff, sizeof(diff),
 --- a/include/linux/etherdevice.h
 +++ b/include/linux/etherdevice.h
-@@ -511,7 +511,7 @@ static inline bool is_etherdev_addr(cons
+@@ -525,7 +525,7 @@ static inline bool is_etherdev_addr(cons
   * @b: Pointer to Ethernet header
   *
   * Compare two Ethernet headers, returns 0 if equal.
@@ -838,7 +838,7 @@ SVN-Revision: 35130
   * aligned OR the platform can handle unaligned access.  This is the
   * case for all packets coming into netif_receive_skb or similar
   * entry points.
-@@ -534,11 +534,12 @@ static inline unsigned long compare_ethe
+@@ -548,11 +548,12 @@ static inline unsigned long compare_ethe
  	fold |= *(unsigned long *)(a + 6) ^ *(unsigned long *)(b + 6);
  	return fold;
  #else

target/linux/generic/backport-5.10/632-v6.3-net-add-helper-eth_addr_add.patch

@@ -0,0 +1,41 @@
+From 7390609b0121a1b982c5ecdfcd72dc328e5784ee Mon Sep 17 00:00:00 2001
+From: Michael Walle <[email protected]>
+Date: Mon, 6 Feb 2023 13:43:42 +0000
+Subject: [PATCH] net: add helper eth_addr_add()
+
+Add a helper to add an offset to a ethernet address. This comes in handy
+if you have a base ethernet address for multiple interfaces.
+
+Signed-off-by: Michael Walle <[email protected]>
+Reviewed-by: Andrew Lunn <[email protected]>
+Acked-by: Jakub Kicinski <[email protected]>
+Signed-off-by: Srinivas Kandagatla <[email protected]>
+Link: https://lore.kernel.org/r/[email protected]
+Signed-off-by: Greg Kroah-Hartman <[email protected]>
+---
+ include/linux/etherdevice.h | 14 ++++++++++++++
+ 1 file changed, 14 insertions(+)
+
+--- a/include/linux/etherdevice.h
++++ b/include/linux/etherdevice.h
+@@ -466,6 +466,20 @@ static inline void eth_addr_inc(u8 *addr
+ }
+ 
+ /**
++ * eth_addr_add() - Add (or subtract) an offset to/from the given MAC address.
++ *
++ * @offset: Offset to add.
++ * @addr: Pointer to a six-byte array containing Ethernet address to increment.
++ */
++static inline void eth_addr_add(u8 *addr, long offset)
++{
++	u64 u = ether_addr_to_u64(addr);
++
++	u += offset;
++	u64_to_ether_addr(u, addr);
++}
++
++/**
+  * is_etherdev_addr - Tell if given Ethernet address belongs to the device.
+  * @dev: Pointer to a device structure
+  * @addr: Pointer to a six-byte array containing the Ethernet address

target/linux/generic/backport-5.15/611-v6.3-net-add-helper-eth_addr_add.patch

@@ -0,0 +1,41 @@
+From 7390609b0121a1b982c5ecdfcd72dc328e5784ee Mon Sep 17 00:00:00 2001
+From: Michael Walle <[email protected]>
+Date: Mon, 6 Feb 2023 13:43:42 +0000
+Subject: [PATCH] net: add helper eth_addr_add()
+
+Add a helper to add an offset to a ethernet address. This comes in handy
+if you have a base ethernet address for multiple interfaces.
+
+Signed-off-by: Michael Walle <[email protected]>
+Reviewed-by: Andrew Lunn <[email protected]>
+Acked-by: Jakub Kicinski <[email protected]>
+Signed-off-by: Srinivas Kandagatla <[email protected]>
+Link: https://lore.kernel.org/r/[email protected]
+Signed-off-by: Greg Kroah-Hartman <[email protected]>
+---
+ include/linux/etherdevice.h | 14 ++++++++++++++
+ 1 file changed, 14 insertions(+)
+
+--- a/include/linux/etherdevice.h
++++ b/include/linux/etherdevice.h
+@@ -478,6 +478,20 @@ static inline void eth_addr_inc(u8 *addr
+ }
+ 
+ /**
++ * eth_addr_add() - Add (or subtract) an offset to/from the given MAC address.
++ *
++ * @offset: Offset to add.
++ * @addr: Pointer to a six-byte array containing Ethernet address to increment.
++ */
++static inline void eth_addr_add(u8 *addr, long offset)
++{
++	u64 u = ether_addr_to_u64(addr);
++
++	u += offset;
++	u64_to_ether_addr(u, addr);
++}
++
++/**
+  * is_etherdev_addr - Tell if given Ethernet address belongs to the device.
+  * @dev: Pointer to a device structure
+  * @addr: Pointer to a six-byte array containing the Ethernet address