From: Scott <[email protected]> This series addresses correctness issues and adds performance optimizations to the AF_PACKET driver, laying the groundwork for upcoming advanced features.
The series is structured as: Patch 1/3: Thread safety and frame calculation fixes - Critical correctness fixes for multi-threaded environments - Proper atomic operations and memory ordering for tp_status - Fixes frame address calculation bugs Patch 2/3: Performance optimizations - Use rte_memcpy() for better performance - Add prefetching for next frame/mbuf - Use rte_pktmbuf_free_bulk() instead of individual frees Patch 3/3: New features and device arguments - Software checksum offload support - TX poll behavior control (txpollnotrdy devarg) - Improved devarg validation These changes prepare the driver for planned follow-up patches that will add significant new capabilities: - io_uring SQPOLL support for TX send notify, which meaningfully improves performance by eliminating syscall overhead and enabling kernel-side polling - GRO/GSO support via PACKET_VNET_HDR to aggregate packets and reduce per-packet interface traversal overhead - TPACKET_V3 protocol support for block-based RX/TX processing, providing packet batching benefits and reducing cache pressure The correctness fixes in patch 1/3 are particularly important for these future features, as io_uring SQPOLL mode involves asynchronous kernel updates to tp_status from independent CPU cores, requiring proper memory ordering. Scott Mitchell (3): net/af_packet: fix thread safety and frame calculations net/af_packet: RX/TX rte_memcpy, bulk free, prefetch net/af_packet: software checksum and tx poll control drivers/net/af_packet/rte_eth_af_packet.c | 389 +++++++++++++++------- 1 file changed, 270 insertions(+), 119 deletions(-) -- 2.39.5 (Apple Git-154)
