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bb2ef9b92b
This hardware can provide only 48 bits of cycle counter. We can leave only 24 bits in the cache to extend RX timestamps from 32 bits to 48 bits. Lower 8 bits of the cached value will be used to check for roll-over while extending to full 48 bits. This change makes cache writes atomic even on 32 bit platforms and we can simply use READ_ONCE()/WRITE_ONCE() pair and remove spinlock. The configuration structure will be also reduced by 4 bytes. Reviewed-by: Michael Chan <michael.chan@broadcom.com> Signed-off-by: Vadim Fedorenko <vadfed@meta.com> Link: https://patch.msgid.link/20241103215108.557531-1-vadfed@meta.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>