Sriram R <quic_srirrama@xxxxxxxxxxx> writes: > Currently Fast xmit is supported in AP, STA and other device types where > the destination doesn't change for the lifetime of its association by > caching the static parts of the header that can be reused directly for > every Tx such as addresses and updates only mutable header fields such as > PN. This technique is not directly applicable for a Mesh device type > due to the dynamic nature of the topology and protocol. The header is > built based on the destination mesh device which is proxying a certain > external device and based on the Mesh destination the next hop changes. > And the RA/A1 which is the next hop for reaching the destination can > vary during runtime as per the best route based on airtime. To > accommodate these changes and to come up with a solution to avoid > overhead during header generation, the headers comprising the MAC, Mesh > and LLC part are cached whenever data for a certain external destination > is sent. This cached header is reused every time a data is sent to that > external destination. > > To ensure the changes in network are reflected in these cached headers, > the Mesh Proxy path table and Mesh path table changes are monitored > and corresponding headers are updated or flushed as applicable so that > the header used for a frame towards a certain destination is valid. > > Old headers are flushed by the mesh housekeeping timers and based on the > cache size. > > Only 6addr frame headers are cached currently. > > Tested with ath11k driver. > > Signed-off-by: Sriram R <quic_srirrama@xxxxxxxxxxx> > --- > v2: Moved to static header cache size of 512 entries > Rearranged entry struct to avoid padding > Used GFP_ATOMIC while entry allocation in tx path > Compile tested from previous version - only above trivial changes > > net/mac80211/ieee80211_i.h | 20 ++ > net/mac80211/mesh.c | 2 + > net/mac80211/mesh.h | 46 +++++ > net/mac80211/mesh_hwmp.c | 8 +- > net/mac80211/mesh_pathtbl.c | 396 ++++++++++++++++++++++++++++++++++++ > net/mac80211/rx.c | 9 +- > net/mac80211/tx.c | 89 ++++++++ > 7 files changed, 566 insertions(+), 4 deletions(-) The title should be: wifi: mac80211: Mesh Fast xmit support But I suspect Johannes can fix that so no need resend because of this. -- https://patchwork.kernel.org/project/linux-wireless/list/ https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches
