On Wed, 25 Jan 2023 01:33:22 +0100 Lorenzo Bianconi wrote: > A summary of the flags being set for various drivers is given below. > Note that XDP_F_REDIRECT_TARGET and XDP_F_FRAG_TARGET are features > that can be turned off and on at runtime. This means that these flags > may be set and unset under RTNL lock protection by the driver. Hence, > READ_ONCE must be used by code loading the flag value. > > Also, these flags are not used for synchronization against the availability > of XDP resources on a device. It is merely a hint, and hence the read > may race with the actual teardown of XDP resources on the device. This > may change in the future, e.g. operations taking a reference on the XDP > resources of the driver, and in turn inhibiting turning off this flag. > However, for now, it can only be used as a hint to check whether device > supports becoming a redirection target. Acked-by: Jakub Kicinski <kuba@xxxxxxxxxx>
