netdev - [PATCH 0/3 bpf-next] intel: AF_XDP support for TX of RX packets

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Message-ID: <20190628221555.3009654-1-jonathan.lemon@gmail.com>
Date:   Fri, 28 Jun 2019 15:15:52 -0700
From:   Jonathan Lemon <jonathan.lemon@...il.com>
To:     <netdev@...r.kernel.org>, <bjorn.topel@...el.com>,
        <magnus.karlsson@...el.com>, <jakub.kicinski@...ronome.com>,
        <jeffrey.t.kirsher@...el.com>
CC:     <kernel-team@...com>
Subject: [PATCH 0/3 bpf-next] intel: AF_XDP support for TX of RX packets

NOTE: This patch depends on my previous "xsk: reuse cleanup" patch,
sent to netdev earlier.

The motivation is to have packets which were received on a zero-copy
AF_XDP socket, and which returned a TX verdict from the bpf program,
queued directly on the TX ring (if they're in the same napi context).

When these TX packets are completed, they are placed back onto the
reuse queue, as there isn't really any other place to handle them.

Space in the reuse queue is preallocated at init time for both the
RX and TX rings.  Another option would have a smaller TX queue size
and count in-flight TX packets, dropping any which exceed the reuseq
size - this approach is omitted for simplicity.

Jonathan Lemon (3):
  net: add convert_to_xdp_frame_keep_zc function
  i40e: Support zero-copy XDP_TX on the RX path for AF_XDP sockets.
  ixgbe: Support zero-copy XDP_TX on the RX path for AF_XDP sockets.

 drivers/net/ethernet/intel/i40e/i40e_txrx.h  |  1 +
 drivers/net/ethernet/intel/i40e/i40e_xsk.c   | 54 ++++++++++++--
 drivers/net/ethernet/intel/ixgbe/ixgbe.h     |  1 +
 drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c | 74 +++++++++++++++++---
 include/net/xdp.h                            | 20 ++++--
 5 files changed, 134 insertions(+), 16 deletions(-)

-- 
2.17.1