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Date: Fri, 8 May 2020 12:14:51 +0300 From: Igor Russkikh <irusskikh@...vell.com> To: Jakub Kicinski <kuba@...nel.org> CC: <netdev@...r.kernel.org>, "David S . Miller" <davem@...emloft.net>, "Mark Starovoytov" <mstarovoitov@...vell.com> Subject: Re: [PATCH net-next 7/7] net: atlantic: unify get_mac_permanent Hi Jakub, >> This patch moves MAC generation into a separate function, which is > called >> from both places to reduce the amount of copy/paste. > > Right, but why do you have your own mac generation rather than using > eth_hw_addr_random(). You need to set NET_ADDR_RANDOM for example, > just use standard helpers, please. We want this still be an Aquantia vendor id MAC, not a fully random mac. Thats why the logic below randomizes only low three octets. >> } >> + >> +static inline bool aq_hw_is_zero_ether_addr(const u8 *addr) > > No static inlines in C files, please. Let compiler decide inlineing & > generate a warning when function becomes unused. Ok, will fix. >> + get_random_bytes(&rnd, sizeof(unsigned int)); >> + l = 0xE300 0000U | (0xFFFFU & rnd) | (0x00 << 16); >> + h = 0x8001300EU; >> + >> + mac[5] = (u8)(0xFFU & l); >> + l >>= 8; >> + mac[4] = (u8)(0xFFU & l); >> + l >>= 8; >> + mac[3] = (u8)(0xFFU & l); >> + l >>= 8; >> + mac[2] = (u8)(0xFFU & l); >> + mac[1] = (u8)(0xFFU & h); >> + h >>= 8; >> + mac[0] = (u8)(0xFFU & h); > > This can be greatly simplified using helpers from etherdevice.h, if > it's really needed. This is the exact place where we put Aquantia vendor id, even if mac is random. eth_hw_addr_random is more suitable for software devices like bridges, which are not related to any vendor. Regards, Igor
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