i40e: add AF_XDP zero-copy Rx support

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This patch adds zero-copy Rx support for AF_XDP sockets. Instead of
allocating buffers of type MEM_TYPE_PAGE_SHARED, the Rx frames are
allocated as MEM_TYPE_ZERO_COPY when AF_XDP is enabled for a certain
queue.

All AF_XDP specific functions are added to a new file, i40e_xsk.c.

Note that when AF_XDP zero-copy is enabled, the XDP action XDP_PASS
will allocate a new buffer and copy the zero-copy frame prior passing
it to the kernel stack.

Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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This commit is contained in:

Björn Töpel 2018-08-28 14:44:32 +02:00 • committed by Alexei Starovoitov

parent 20a739dbef

commit 0a714186d3

7 changed files with 775 additions and 11 deletions

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3

drivers/net/ethernet/intel/i40e/Makefile

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19

drivers/net/ethernet/intel/i40e/i40e.h

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53

drivers/net/ethernet/intel/i40e/i40e_main.c

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9

drivers/net/ethernet/intel/i40e/i40e_txrx.c

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20

drivers/net/ethernet/intel/i40e/i40e_txrx.h

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661

drivers/net/ethernet/intel/i40e/i40e_xsk.c

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21

drivers/net/ethernet/intel/i40e/i40e_xsk.h

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