iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ethernet: add a helper for assigning port addresses

Browse Source 
[ Upstream commit e80094a473eefad9d856ce3ab0d7afdbb64800c4 ]

We have 5 drivers which offset base MAC addr by port id.
Create a helper for them.

This helper takes care of overflows, which some drivers
did not do, please complain if that's going to break
anything!

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Reviewed-by: Shannon Nelson <snelson@pensando.io>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: 6e159fd653d7 ("ethernet: Add helper for assigning packet type when dest address does not match device address")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jakub Kicinski 2021-10-18 14:10:02 -07:00 committed by Greg Kroah-Hartman
parent a82fcda87f
commit 51fcea1b7c
1 changed files with 21 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

21
include/linux/etherdevice.h
View File

@ -522,6 +522,27 @@ static inline unsigned long compare_ether_header(const void *a, const void *b)
#endif
}
/**
* eth_hw_addr_gen - Generate and assign Ethernet address to a port
* @dev: pointer to port's net_device structure
* @base_addr: base Ethernet address
* @id: offset to add to the base address
*
* Generate a MAC address using a base address and an offset and assign it
* to a net_device. Commonly used by switch drivers which need to compute
* addresses for all their ports. addr_assign_type is not changed.
*/
static inline void eth_hw_addr_gen(struct net_device *dev, const u8 *base_addr,
unsigned int id)
{
u64 u = ether_addr_to_u64(base_addr);
u8 addr[ETH_ALEN];
u += id;
u64_to_ether_addr(u, addr);
eth_hw_addr_set(dev, addr);
}
/**
* eth_skb_pad - Pad buffer to mininum number of octets for Ethernet frame
* @skb: Buffer to pad