The main purpose of this patchset is to add AF_XDP support for UMEM
chunk sizes > PAGE_SIZE. This is enabled for UMEMs backed by HugeTLB
pages.
Note, v5 fixes a major bug in previous versions of this patchset.
In particular, dma_map_page_attrs used to be called once for each
order-0 page in a hugepage with the assumption that returned I/O
addresses are contiguous within a hugepage. This assumption is incorrect
when an IOMMU is enabled. To fix this, v5 does DMA page accounting
accounting at hugepage granularity.
Changes since v4:
* Use hugepages in DMA map (fixes zero-copy mode with IOMMU).
* Use pool->dma_pages to check for DMA. This change is needed to avoid
performance regressions).
* Update commit message and benchmark table.
Changes since v3:
* Fix checkpatch.pl whitespace error.
Changes since v2:
* Related fixes/improvements included with v2 have been removed. These
changes have all been resubmitted as standalone patchsets.
* Minimize uses of #ifdef CONFIG_HUGETLB_PAGE.
* Improve AF_XDP documentation.
* Update benchmark table in commit message.
Changes since v1:
* Add many fixes/improvements to the XSK selftests.
* Add check for unaligned descriptors that overrun UMEM.
* Fix compile errors when CONFIG_HUGETLB_PAGE is not set.
* Fix incorrect use of _Static_assert.
* Update AF_XDP documentation.
* Rename unaligned 9K frame size test.
* Make xp_check_dma_contiguity less conservative.
* Add more information to benchmark table.
Thanks to Magnus Karlsson for all his support!
Happy Easter!
Kal Conley (4):
xsk: Use pool->dma_pages to check for DMA
xsk: Support UMEM chunk_size > PAGE_SIZE
selftests: xsk: Use hugepages when umem->frame_size > PAGE_SIZE
selftests: xsk: Add tests for 8K and 9K frame sizes
Documentation/networking/af_xdp.rst | 36 ++++++++++------
include/net/xdp_sock.h | 2 +
include/net/xdp_sock_drv.h | 12 ++++++
include/net/xsk_buff_pool.h | 12 +++---
net/xdp/xdp_umem.c | 55 +++++++++++++++++++-----
net/xdp/xsk_buff_pool.c | 43 ++++++++++--------
tools/testing/selftests/bpf/xskxceiver.c | 27 +++++++++++-
tools/testing/selftests/bpf/xskxceiver.h | 2 +
8 files changed, 142 insertions(+), 47 deletions(-)
--
2.39.2
