Series implementing a zerocopy method for OVS upcall messages. Based
on top of commit: (''openvswitch: Enable memory mapped Netlink i/o'')
Thomas Graf (6):
net: Export skb_zerocopy() to zerocopy from one skb to another
openvswitch: Allow user space to announce ability to accept unaligned
Netlink messages
openvswitch: Drop user features if old user space attempted to create
datapath
openvswitch: Pass datapath into userspace queue functions
openvswitch: Use skb_zerocopy() for upcall
openvswitch: Compute checksum in skb_gso_segment() if needed
include/linux/skbuff.h | 3 +
include/uapi/linux/openvswitch.h | 14 ++++-
net/core/skbuff.c | 85 ++++++++++++++++++++++++++++
net/netfilter/nfnetlink_queue_core.c | 59 ++-----------------
net/openvswitch/datapath.c | 106 ++++++++++++++++++++++++++---------
net/openvswitch/datapath.h | 2 +
6 files changed, 185 insertions(+), 84 deletions(-)
---
V9: - Dropped patches 1-3 (merged)
- Dropped skb argument from upcall_msg_size()
- Dropped dp_ifindex and net argument from all queue functions
- Added patch to remove NETIF_F_HW_CSUM from __skb_gso_segment()
V8: - Dropped patch adding NLM_F_REPLACE support, I'll pursue this in a
separate patch series. Addresses Jesse's comments.
- Improved comment describing OVS_DATAPATH_VERSION bump.
V7: - removed unintential kernel-doc comment
- WARN_ONCE() -> WARN(), message on single line, added \n
V6: - Added memory mapped netlink i/o support
- Drop user_features if old user space not aware of user features
reuses an existing datapath
V5: - Removed padding requirement in user space
- Added OVS_DP_F_UNALIGNED flag let user space signal ability to
receive unaligned Netlink messages, fall back to linear copy
otherwise.
V4: - Daniel Borkmann pointed out that the style in skbuff.h has changed
in net-next, adapted to no longer using extern in headers.
V3: - Removed unneeded alignment of nlmsg_len after padding
V2: - Added skb_zerocopy_headlen() to calculate headroom of destination
buffer. This also takes care of the from->head_frag issue.
- Attribute alignment for frag_list case
- API documentation
- performance data for CHECKSUM_PARTIAL tx case
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