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linux/drivers/net/ethernet/intel/igc/igc_xdp.h

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igc: Add initial XDP support Add the initial XDP support to the igc driver. For now, only XDP_PASS, XDP_DROP, XDP_ABORTED actions are supported. Upcoming patches will add support for the remaining XDP actions. XDP configuration helpers are defined in a new file, igc_xdp.c. These helpers are utilized in igc_main.c to implement the ndo_bpf callback. XDP-related code that belongs to the driver's hot path is landed in igc_main.c. By default, the driver uses Rx buffers with 2 KB size. When XDP is enabled, it uses larger buffers so we have enough space to accommodate the headroom and tailroom required by XDP infrastructure. Also, the driver doesn't support XDP functionality with frames that span over multiple buffers so jumbo frames are not allowed for now. The approach implemented follows the approach implemented in other Intel drivers as much as possible for the sake of consistency across the drivers. Quick comment regarding igc_build_skb(): this patch doesn't touch it because the function is never called. It seems its support is incomplete/in progress. The function was added by commit 0507ef8a0372b ("igc: Add transmit and receive fastpath and interrupt handlers") but ring_uses_build_skb() always return False since the IGC_RING_FLAG_RX_ BUILD_SKB_ENABLED isn't set anywhere in the driver code. This patch has been tested with the sample app "xdp1" located in samples/bpf/ dir. Signed-off-by: Andre Guedes <andre.guedes@intel.com> Signed-off-by: Vedang Patel <vedang.patel@intel.com> Signed-off-by: Jithu Joseph <jithu.joseph@intel.com> Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Tested-by: Dvora Fuxbrumer <dvorax.fuxbrumer@linux.intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
2021-03-09 23:13:20 -08:00
/* SPDX-License-Identifier: GPL-2.0 */
/* Copyright (c) 2020, Intel Corporation. */
#ifndef _IGC_XDP_H_
#define _IGC_XDP_H_
int igc_xdp_set_prog(struct igc_adapter *adapter, struct bpf_prog *prog,
struct netlink_ext_ack *extack);
igc: Enable RX via AF_XDP zero-copy Add support for receiving packets via AF_XDP zero-copy mechanism. Add a new flag to 'enum igc_ring_flags_t' to indicate the ring has AF_XDP zero-copy enabled so proper ring setup is carried out during ring configuration in igc_configure_rx_ring(). RX buffers can now be allocated via the shared pages mechanism (default behavior of the driver) or via xsk pool (when AF_XDP zero-copy is enabled) so a union is added to the 'struct igc_rx_buffer' to cover both cases. When AF_XDP zero-copy is enabled, rx buffers are allocated from the xsk pool using the new helper igc_alloc_rx_buffers_zc() which is the counterpart of igc_alloc_rx_buffers(). Likewise other Intel drivers that support AF_XDP zero-copy, in igc we have a dedicated path for cleaning up rx irqs when zero-copy is enabled. This avoids adding too many checks within igc_clean_rx_irq(), resulting in a more readable and efficient code since this function is called from the hot-path of the driver. Signed-off-by: Andre Guedes <andre.guedes@intel.com> Signed-off-by: Vedang Patel <vedang.patel@intel.com> Signed-off-by: Jithu Joseph <jithu.joseph@intel.com> Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Tested-by: Dvora Fuxbrumer <dvorax.fuxbrumer@linux.intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
2021-04-22 23:25:54 -07:00
int igc_xdp_setup_pool(struct igc_adapter *adapter, struct xsk_buff_pool *pool,
u16 queue_id);
igc: Add initial XDP support Add the initial XDP support to the igc driver. For now, only XDP_PASS, XDP_DROP, XDP_ABORTED actions are supported. Upcoming patches will add support for the remaining XDP actions. XDP configuration helpers are defined in a new file, igc_xdp.c. These helpers are utilized in igc_main.c to implement the ndo_bpf callback. XDP-related code that belongs to the driver's hot path is landed in igc_main.c. By default, the driver uses Rx buffers with 2 KB size. When XDP is enabled, it uses larger buffers so we have enough space to accommodate the headroom and tailroom required by XDP infrastructure. Also, the driver doesn't support XDP functionality with frames that span over multiple buffers so jumbo frames are not allowed for now. The approach implemented follows the approach implemented in other Intel drivers as much as possible for the sake of consistency across the drivers. Quick comment regarding igc_build_skb(): this patch doesn't touch it because the function is never called. It seems its support is incomplete/in progress. The function was added by commit 0507ef8a0372b ("igc: Add transmit and receive fastpath and interrupt handlers") but ring_uses_build_skb() always return False since the IGC_RING_FLAG_RX_ BUILD_SKB_ENABLED isn't set anywhere in the driver code. This patch has been tested with the sample app "xdp1" located in samples/bpf/ dir. Signed-off-by: Andre Guedes <andre.guedes@intel.com> Signed-off-by: Vedang Patel <vedang.patel@intel.com> Signed-off-by: Jithu Joseph <jithu.joseph@intel.com> Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Tested-by: Dvora Fuxbrumer <dvorax.fuxbrumer@linux.intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
2021-03-09 23:13:20 -08:00
igc: Move igc_xdp_is_enabled() Move the helper igc_xdp_is_enabled() to igc_xdp.h so it can be reused in igc_xdp.c by upcoming patches that will introduce AF_XDP zero-copy support to the driver. Signed-off-by: Andre Guedes <andre.guedes@intel.com> Signed-off-by: Vedang Patel <vedang.patel@intel.com> Signed-off-by: Jithu Joseph <jithu.joseph@intel.com> Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Tested-by: Dvora Fuxbrumer <dvorax.fuxbrumer@linux.intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
2021-04-22 23:25:47 -07:00
static inline bool igc_xdp_is_enabled(struct igc_adapter *adapter)
{
return !!adapter->xdp_prog;
}
igc: Add initial XDP support Add the initial XDP support to the igc driver. For now, only XDP_PASS, XDP_DROP, XDP_ABORTED actions are supported. Upcoming patches will add support for the remaining XDP actions. XDP configuration helpers are defined in a new file, igc_xdp.c. These helpers are utilized in igc_main.c to implement the ndo_bpf callback. XDP-related code that belongs to the driver's hot path is landed in igc_main.c. By default, the driver uses Rx buffers with 2 KB size. When XDP is enabled, it uses larger buffers so we have enough space to accommodate the headroom and tailroom required by XDP infrastructure. Also, the driver doesn't support XDP functionality with frames that span over multiple buffers so jumbo frames are not allowed for now. The approach implemented follows the approach implemented in other Intel drivers as much as possible for the sake of consistency across the drivers. Quick comment regarding igc_build_skb(): this patch doesn't touch it because the function is never called. It seems its support is incomplete/in progress. The function was added by commit 0507ef8a0372b ("igc: Add transmit and receive fastpath and interrupt handlers") but ring_uses_build_skb() always return False since the IGC_RING_FLAG_RX_ BUILD_SKB_ENABLED isn't set anywhere in the driver code. This patch has been tested with the sample app "xdp1" located in samples/bpf/ dir. Signed-off-by: Andre Guedes <andre.guedes@intel.com> Signed-off-by: Vedang Patel <vedang.patel@intel.com> Signed-off-by: Jithu Joseph <jithu.joseph@intel.com> Reviewed-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Tested-by: Dvora Fuxbrumer <dvorax.fuxbrumer@linux.intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
2021-03-09 23:13:20 -08:00
#endif /* _IGC_XDP_H_ */
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