The set grew from the poor performance of %BPF_F_TEST_XDP_LIVE_FRAMES when the ice-backed device is a sender. Initially there were around 3.3 Mpps / thread, while I have 5.5 on skb-based pktgen... After fixing 0005 (0004 is a prereq for it) first (strange thing nobody noticed that earlier), I started catching random OOMs. This is how 0002 (and partially 0001) appeared. 0003 is a suggestion from Maciej to not waste time on refactoring dead lines. 0006 is a "cherry on top" to get away with the final 6.7 Mpps. 4.5 of 6 are fixes, but only the first three are tagged, since it then starts being tricky. I may backport them manually later on. TL;DR for the series is that shortcuts are good, but only as long as they don't make the driver miss important things. %XDP_TX is purely driver-local, however .ndo_xdp_xmit() is not, and sometimes assumptions can be unsafe there. With that series and also one core code patch[0], "live frames" and xdp-trafficgen are now safe'n'fast on ice (probably more to come). [0] https://lore.kernel.org/all/20230209172827.874728-1-alexandr.lobakin@xxxxxxxxx --- Goes to directly to bpf-next as touches the recently added/changed code. Alexander Lobakin (6): ice: fix ice_tx_ring::xdp_tx_active underflow ice: fix XDP Tx ring overrun ice: remove two impossible branches on XDP Tx cleaning ice: robustify cleaning/completing XDP Tx buffers ice: fix freeing XDP frames backed by Page Pool ice: micro-optimize .ndo_xdp_xmit() path drivers/net/ethernet/intel/ice/ice_txrx.c | 67 +++++++++----- drivers/net/ethernet/intel/ice/ice_txrx.h | 37 ++++++-- drivers/net/ethernet/intel/ice/ice_txrx_lib.c | 88 ++++++++++++------- drivers/net/ethernet/intel/ice/ice_txrx_lib.h | 4 +- drivers/net/ethernet/intel/ice/ice_xsk.c | 12 +-- 5 files changed, 136 insertions(+), 72 deletions(-) -- 2.39.1
