RE: [Intel-wired-lan] [PATCH net-next 2/3] ixgbe: optimize for XDP_REDIRECT in xsk path

From: Intel-wired-lan <redacted> On Behalf Of
Magnus Karlsson
Sent: Wednesday, December 2, 2020 8:37 PM
To: Karlsson, Magnus <magnus.karlsson@intel.com>; Topel, Bjorn
[off-list ref]; intel-wired-lan@lists.osuosl.org; Nguyen, Anthony L
[off-list ref]
Cc: netdev@vger.kernel.org; maciejromanfijalkowski@gmail.com
Subject: [Intel-wired-lan] [PATCH net-next 2/3] ixgbe: optimize for
XDP_REDIRECT in xsk path

From: Magnus Karlsson <magnus.karlsson@intel.com>

Optimize ixgbe_run_xdp_zc() for the XDP program verdict being XDP_REDIRECT
in the zsk zero-copy path. This path is only used when having AF_XDP zero-copy
on and in that case most packets will be directed to user space. This provides a
little under 100k extra packets in throughput on my server when running l2fwd in
xdpsock.

Signed-off-by: Magnus Karlsson <magnus.karlsson@intel.com>
---
 drivers/net/ethernet/intel/ixgbe/ixgbe_xsk.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

Tested-by: Vishakha Jambekar <redacted>