From: Alexander Duyck <adu...@mirantis.com> Date: Sun, 10 Apr 2016 21:44:38 -0400
> This patch series sets up a few different things. > > First it adds support for GRO of frames with a fixed IP ID value. This > will allow us to perform GRO for frames that go through things like an IPv6 > to IPv4 header translation. > > The second item we add is support for segmenting frames that are generated > this way. Most devices only support an incrementing IP ID value, and in > the case of TCP the IP ID can be ignored in many cases since the DF bit > should be set. So we can technically segment these frames using existing > TSO if we are willing to allow the IP ID to be mangled. As such I have > added a matching feature for the new form of GRO/GSO called TCP IPv4 ID > mangling. With this enabled we can assemble and disassemble a frame with > the sequence number fixed and the only ill effect will be that the IPv4 ID > will be altered which may or may not have any noticeable effect. As such I > have defaulted the feature to disabled. > > The third item this patch series adds is support for partial GSO > segmentation. Partial GSO segmentation allows us to split a large frame > into two pieces. The first piece will have an even multiple of MSS worth > of data and the headers before the one pointed to by csum_start will have > been updated so that they are correct for if the data payload had already > been segmented. By doing this we can do things such as precompute the > outer header checksums for a frame to be segmented allowing us to perform > TSO on devices that don't support tunneling, or tunneling with outer header > checksums. > > This patch set is based on the net-next tree, but I included "net: remove > netdevice gso_min_segs" in my tree as I assume it is likely to be applied > before this patch set will and I wanted to avoid a merge conflict. > > v2: Fixed items reported by Jesse Gross > fixed missing GSO flag in MPLS check > adding DF check for MANGLEID > Moved extra GSO feature checks into gso_features_check > Rebased batches to account for "net: remove netdevice gso_min_segs" > > Driver patches from the first patch set should still be compatible. However > I do have a few changes in them so I will submit a v2 of those to Jeff > Kirsher once these patches are accepted into net-next. > > Example driver patches for i40e, ixgbe, and igb: > https://patchwork.ozlabs.org/patch/608221/ > https://patchwork.ozlabs.org/patch/608224/ > https://patchwork.ozlabs.org/patch/608225/ Series applied, thanks Alexander.
