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path: root/drivers/net/ethernet/intel/igc/igc_xdp.c
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Diffstat (limited to 'drivers/net/ethernet/intel/igc/igc_xdp.c')
-rw-r--r--drivers/net/ethernet/intel/igc/igc_xdp.c146
1 files changed, 146 insertions, 0 deletions
diff --git a/drivers/net/ethernet/intel/igc/igc_xdp.c b/drivers/net/ethernet/intel/igc/igc_xdp.c
new file mode 100644
index 000000000..aeeb34e64
--- /dev/null
+++ b/drivers/net/ethernet/intel/igc/igc_xdp.c
@@ -0,0 +1,146 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2020, Intel Corporation. */
+
+#include <linux/if_vlan.h>
+#include <net/xdp_sock_drv.h>
+
+#include "igc.h"
+#include "igc_xdp.h"
+
+int igc_xdp_set_prog(struct igc_adapter *adapter, struct bpf_prog *prog,
+ struct netlink_ext_ack *extack)
+{
+ struct net_device *dev = adapter->netdev;
+ bool if_running = netif_running(dev);
+ struct bpf_prog *old_prog;
+
+ if (dev->mtu > ETH_DATA_LEN) {
+ /* For now, the driver doesn't support XDP functionality with
+ * jumbo frames so we return error.
+ */
+ NL_SET_ERR_MSG_MOD(extack, "Jumbo frames not supported");
+ return -EOPNOTSUPP;
+ }
+
+ if (if_running)
+ igc_close(dev);
+
+ old_prog = xchg(&adapter->xdp_prog, prog);
+ if (old_prog)
+ bpf_prog_put(old_prog);
+
+ if (if_running)
+ igc_open(dev);
+
+ return 0;
+}
+
+static int igc_xdp_enable_pool(struct igc_adapter *adapter,
+ struct xsk_buff_pool *pool, u16 queue_id)
+{
+ struct net_device *ndev = adapter->netdev;
+ struct device *dev = &adapter->pdev->dev;
+ struct igc_ring *rx_ring, *tx_ring;
+ struct napi_struct *napi;
+ bool needs_reset;
+ u32 frame_size;
+ int err;
+
+ if (queue_id >= adapter->num_rx_queues ||
+ queue_id >= adapter->num_tx_queues)
+ return -EINVAL;
+
+ frame_size = xsk_pool_get_rx_frame_size(pool);
+ if (frame_size < ETH_FRAME_LEN + VLAN_HLEN * 2) {
+ /* When XDP is enabled, the driver doesn't support frames that
+ * span over multiple buffers. To avoid that, we check if xsk
+ * frame size is big enough to fit the max ethernet frame size
+ * + vlan double tagging.
+ */
+ return -EOPNOTSUPP;
+ }
+
+ err = xsk_pool_dma_map(pool, dev, IGC_RX_DMA_ATTR);
+ if (err) {
+ netdev_err(ndev, "Failed to map xsk pool\n");
+ return err;
+ }
+
+ needs_reset = netif_running(adapter->netdev) && igc_xdp_is_enabled(adapter);
+
+ rx_ring = adapter->rx_ring[queue_id];
+ tx_ring = adapter->tx_ring[queue_id];
+ /* Rx and Tx rings share the same napi context. */
+ napi = &rx_ring->q_vector->napi;
+
+ if (needs_reset) {
+ igc_disable_rx_ring(rx_ring);
+ igc_disable_tx_ring(tx_ring);
+ napi_disable(napi);
+ }
+
+ set_bit(IGC_RING_FLAG_AF_XDP_ZC, &rx_ring->flags);
+ set_bit(IGC_RING_FLAG_AF_XDP_ZC, &tx_ring->flags);
+
+ if (needs_reset) {
+ napi_enable(napi);
+ igc_enable_rx_ring(rx_ring);
+ igc_enable_tx_ring(tx_ring);
+
+ err = igc_xsk_wakeup(ndev, queue_id, XDP_WAKEUP_RX);
+ if (err) {
+ xsk_pool_dma_unmap(pool, IGC_RX_DMA_ATTR);
+ return err;
+ }
+ }
+
+ return 0;
+}
+
+static int igc_xdp_disable_pool(struct igc_adapter *adapter, u16 queue_id)
+{
+ struct igc_ring *rx_ring, *tx_ring;
+ struct xsk_buff_pool *pool;
+ struct napi_struct *napi;
+ bool needs_reset;
+
+ if (queue_id >= adapter->num_rx_queues ||
+ queue_id >= adapter->num_tx_queues)
+ return -EINVAL;
+
+ pool = xsk_get_pool_from_qid(adapter->netdev, queue_id);
+ if (!pool)
+ return -EINVAL;
+
+ needs_reset = netif_running(adapter->netdev) && igc_xdp_is_enabled(adapter);
+
+ rx_ring = adapter->rx_ring[queue_id];
+ tx_ring = adapter->tx_ring[queue_id];
+ /* Rx and Tx rings share the same napi context. */
+ napi = &rx_ring->q_vector->napi;
+
+ if (needs_reset) {
+ igc_disable_rx_ring(rx_ring);
+ igc_disable_tx_ring(tx_ring);
+ napi_disable(napi);
+ }
+
+ xsk_pool_dma_unmap(pool, IGC_RX_DMA_ATTR);
+ clear_bit(IGC_RING_FLAG_AF_XDP_ZC, &rx_ring->flags);
+ clear_bit(IGC_RING_FLAG_AF_XDP_ZC, &tx_ring->flags);
+
+ if (needs_reset) {
+ napi_enable(napi);
+ igc_enable_rx_ring(rx_ring);
+ igc_enable_tx_ring(tx_ring);
+ }
+
+ return 0;
+}
+
+int igc_xdp_setup_pool(struct igc_adapter *adapter, struct xsk_buff_pool *pool,
+ u16 queue_id)
+{
+ return pool ? igc_xdp_enable_pool(adapter, pool, queue_id) :
+ igc_xdp_disable_pool(adapter, queue_id);
+}