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[net-next,v8,0/4] GVE Raw Addressing

Message ID 20201125173846.3033449-1-awogbemila@google.com
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Series GVE Raw Addressing | expand

Message

David Awogbemila Nov. 25, 2020, 5:38 p.m. UTC 
Patchset description:
This  patchset introduces "raw addressing" mode to the GVE driver.
Previously (in "queue_page_list" or "qpl" mode), the driver would
pre-allocate and dma_map buffers to be used on egress and ingress.
On egress, it would copy data from the skb provided to the
pre-allocated buffers - this was expensive.
In raw addressing mode, the driver can avoid this copy and simply
dma_map the skb's data so that the NIC can use it.
On ingress, the driver passes buffers up to the networking stack and
then frees and reallocates buffers when necessary instead of using
skb_copy_to_linear_data.
Patch 3 separates the page refcount tracking mechanism
into a function gve_rx_can_recycle_buffer which uses get_page - this will
be changed in a future patch to eliminate the use of get_page in tracking
page refcounts.

Changes from v7
Patch 1: Drop static inline functions in gve_adminq.c.
Patch 2: Simplify gve_rx_refill_buffers logic to use (fill_cnt - rx->cnt).
Patch 4: Use per-ring dma_mapping error stat.

Catherine Sullivan (3):
  gve: Add support for raw addressing device option
  gve: Add support for raw addressing to the rx path
  gve: Add support for raw addressing in the tx path

David Awogbemila (1):
  gve: Rx Buffer Recycling

 drivers/net/ethernet/google/gve/gve.h         |  39 +-
 drivers/net/ethernet/google/gve/gve_adminq.c  |  89 ++++-
 drivers/net/ethernet/google/gve/gve_adminq.h  |  15 +-
 drivers/net/ethernet/google/gve/gve_desc.h    |  19 +-
 drivers/net/ethernet/google/gve/gve_ethtool.c |   2 +
 drivers/net/ethernet/google/gve/gve_main.c    |  11 +-
 drivers/net/ethernet/google/gve/gve_rx.c      | 364 +++++++++++++-----
 drivers/net/ethernet/google/gve/gve_tx.c      | 207 ++++++++--
 8 files changed, 579 insertions(+), 167 deletions(-)