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Date:   Tue, 12 Feb 2019 09:52:03 +0100
From:   Björn Töpel <bjorn.topel@...il.com>
To:     intel-wired-lan@...ts.osuosl.org
Cc:     Björn Töpel <bjorn.topel@...il.com>,
        magnus.karlsson@...el.com, magnus.karlsson@...il.com,
        netdev@...r.kernel.org, jan.sokolowski@...el.com
Subject: [PATCH 0/2] i40e: fix regression that enables AF_XDP ZC unconditionally

This series addresses a recent AF_XDP zero-copy regression.

In commit f3fef2b6e1cc ("i40e: Remove umem from VSI") a regression was
introduced; When the VSI was reset, the setup code would try to enable
AF_XDP ZC unconditionally (as long as there was a umem placed in the
netdev._rx struct). Here, we add a bitmap to the VSI that tracks if a
certain queue pair has been "zero-copy enabled" via the ndo_bpf. The
bitmap is used in i40e_xsk_umem, and enables zero-copy if and only if
XDP is enabled, the corresponding qid in the bitmap is set and the
umem is non-NULL.

Thanks,
Björn


Björn Töpel (2):
  i40e: move i40e_xsk_umem function
  i40e: add tracking of AF_XDP ZC state for each queue pair

 drivers/net/ethernet/intel/i40e/i40e.h      | 16 ++----------
 drivers/net/ethernet/intel/i40e/i40e_main.c | 28 +++++++++++++++++++++
 drivers/net/ethernet/intel/i40e/i40e_xsk.c  |  3 +++
 3 files changed, 33 insertions(+), 14 deletions(-)

-- 
2.19.1

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