On 12/3/2020 10:08 AM, Stephen Hemminger wrote:
On Thu, 3 Dec 2020 07:59:54 -0600
George Prekas <preka...@amazon.com> wrote:
Insert a compiler barrier to make sure that the IP checksum calculation
happens after setting all the fields of the IP header.
Signed-off-by: George Prekas <preka...@amazon.com>
I don't think this is necessary. All other OS's don't have to do this.
The CPU is going to maintain proper memory order.
Hi Stephen,
This is not a CPU or OS issue. This is a compiler issue. The compiler is
free to reorder statements if it does not detect dependencies between
them. Without this compiler barrier, the calculated IP checksum is wrong.
