73f1071c1d
Add support for XDP_TX action which enables XDP programs to transmit back receiving frames. I225 controller has only 4 Tx hardware queues. Since XDP programs may not even issue an XDP_TX action, this patch doesn't reserve dedicated queues just for XDP like other Intel drivers do. Instead, the queues are shared between the network stack and XDP. The netdev queue lock is used to ensure mutual exclusion. Since frames can now be transmitted via XDP_TX, the igc_tx_buffer structure is modified so we are able to save a reference to the xdp frame for later clean up once the packet is transmitted. The tx_buffer is mapped to either a skb or a xdpf so we use a union to save the skb or xdpf pointer and have a bit in tx_flags to indicate which field to use. This patch has been tested with the sample app "xdp2" 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>
60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020, Intel Corporation. */
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#include "igc.h"
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#include "igc_xdp.h"
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int igc_xdp_set_prog(struct igc_adapter *adapter, struct bpf_prog *prog,
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struct netlink_ext_ack *extack)
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{
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struct net_device *dev = adapter->netdev;
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bool if_running = netif_running(dev);
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struct bpf_prog *old_prog;
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if (dev->mtu > ETH_DATA_LEN) {
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/* For now, the driver doesn't support XDP functionality with
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* jumbo frames so we return error.
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*/
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NL_SET_ERR_MSG_MOD(extack, "Jumbo frames not supported");
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return -EOPNOTSUPP;
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}
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if (if_running)
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igc_close(dev);
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old_prog = xchg(&adapter->xdp_prog, prog);
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if (old_prog)
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bpf_prog_put(old_prog);
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if (if_running)
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igc_open(dev);
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return 0;
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}
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int igc_xdp_register_rxq_info(struct igc_ring *ring)
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{
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struct net_device *dev = ring->netdev;
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int err;
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err = xdp_rxq_info_reg(&ring->xdp_rxq, dev, ring->queue_index, 0);
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if (err) {
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netdev_err(dev, "Failed to register xdp rxq info\n");
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return err;
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}
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err = xdp_rxq_info_reg_mem_model(&ring->xdp_rxq, MEM_TYPE_PAGE_SHARED,
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NULL);
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if (err) {
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netdev_err(dev, "Failed to register xdp rxq mem model\n");
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xdp_rxq_info_unreg(&ring->xdp_rxq);
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return err;
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}
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return 0;
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}
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void igc_xdp_unregister_rxq_info(struct igc_ring *ring)
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{
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xdp_rxq_info_unreg(&ring->xdp_rxq);
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}
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