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conn: simplify supportsUDPOffload 

This allows a kernel to support UDP_GRO while not supporting
UDP_SEGMENT.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2023-10-18 21:02:52 +02:00
parent 42ec952ead
commit 177caa7e44
1 changed files with 2 additions and 8 deletions
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10
conn/features_linux.go
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@ -18,15 +18,9 @@ func supportsUDPOffload(conn *net.UDPConn) (txOffload, rxOffload bool) {
}
err = rc.Control(func(fd uintptr) {
_, errSyscall := unix.GetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_SEGMENT)
if errSyscall != nil {
return
}
txOffload = true
txOffload = errSyscall == nil
opt, errSyscall := unix.GetsockoptInt(int(fd), unix.IPPROTO_UDP, unix.UDP_GRO)
if errSyscall != nil {
return
}
rxOffload = opt == 1
rxOffload = errSyscall == nil && opt == 1
})
if err != nil {
return false, false