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Replace the explicit umem reference passed to the driver in AF_XDP
zero-copy mode with the buffer pool instead. This in preparation for
extending the functionality of the zero-copy mode so that umems can be
shared between queues on the same netdev and also between netdevs. In
this commit, only an umem reference has been added to the buffer pool
struct. But later commits will add other entities to it. These are
going to be entities that are different between different queue ids
and netdevs even though the umem is shared between them.
Signed-off-by: Magnus Karlsson <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
Acked-by: Björn Töpel <[email protected]>
Link: https://lore.kernel.org/bpf/[email protected]
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Remove MEM_TYPE_ZERO_COPY in favor of the new MEM_TYPE_XSK_BUFF_POOL
APIs.
v4->v5: Fixed "warning: Excess function parameter 'alloc' description
in 'ice_alloc_rx_bufs_zc'" and "warning: Excess function
parameter 'xdp' description in
'ice_construct_skb_zc'". (Jakub)
Signed-off-by: Maciej Fijalkowski <[email protected]>
Signed-off-by: Björn Töpel <[email protected]>
Signed-off-by: Alexei Starovoitov <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/bpf/[email protected]
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Using ENOTSUPP almost always results in some bizarre error message to
be printed in userspace. This is likely because ENOTSUPP was defined for
the NFS protocol (as per a comment in include/linux/errno.h). Use
EOPNOTSUPP instead.
Signed-off-by: Anirudh Venkataramanan <[email protected]>
Signed-off-by: Tony Nguyen <[email protected]>
Tested-by: Andrew Bowers <[email protected]>
Signed-off-by: Jeff Kirsher <[email protected]>
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Add zero copy AF_XDP support. This patch adds zero copy support for
Tx and Rx; code for zero copy is added to ice_xsk.h and ice_xsk.c.
For Tx, implement ndo_xsk_wakeup. As with other drivers, reuse
existing XDP Tx queues for this task, since XDP_REDIRECT guarantees
mutual exclusion between different NAPI contexts based on CPU ID. In
turn, a netdev can XDP_REDIRECT to another netdev with a different
NAPI context, since the operation is bound to a specific core and each
core has its own hardware ring.
For Rx, allocate frames as MEM_TYPE_ZERO_COPY on queues that AF_XDP is
enabled.
Signed-off-by: Krzysztof Kazimierczak <[email protected]>
Co-developed-by: Maciej Fijalkowski <[email protected]>
Signed-off-by: Maciej Fijalkowski <[email protected]>
Signed-off-by: Tony Nguyen <[email protected]>
Signed-off-by: Jeff Kirsher <[email protected]>
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