Patch 1/5 handles the easy non-batched case with a copy to a padded buffer (only if needed). Patches 2/5 and 3/5 clean coding style up before further changes. Patch 4/5 deals with TCP and UDP batched frames in non-vhost-user modes. Patch 5/5 is for batched frames in vhost-user mode instead. v3: * in 4/5, add calls to tap_hdr_update() from UDP and TCP code to actually update the frame length descriptors after padding * refactor 5/5 entirely based on David's feedback: assume that the first buffer supplied by the guest is at least 60 bytes long, and introduce a vu_pad() common function for both TCP and UDP. Don't recalculate l2len in it, as all the callers already do. v2: * in 1/5, calculate vnet_len *after* padding * in 5/5: - pass the right pointers to memset() - explicitly request at least ETH_ZLEN bytes from vu_collect() Stefano Brivio (5): tap: Pad non-batched frames to 802.3 minimum (60 bytes) if needed tcp: Fix coding style for comment to enum tcp_iov_parts udp: Fix coding style for comment to enum udp_iov_idx tcp, udp: Pad batched frames to 60 bytes (802.3 minimum) in non-vhost-user modes tcp, udp: Pad batched frames for vhost-user modes to 60 bytes (802.3 minimum) tap.c | 11 ++++++++++- tcp.c | 2 +- tcp_buf.c | 23 +++++++++++++++++++++++ tcp_internal.h | 4 +++- tcp_vu.c | 17 ++++++++++++----- udp.c | 43 +++++++++++++++++++++++++++++++++++-------- udp_vu.c | 8 ++++++-- util.c | 3 +++ util.h | 3 +++ vu_common.c | 14 ++++++++++++++ vu_common.h | 1 + 11 files changed, 111 insertions(+), 18 deletions(-) -- 2.43.0