sfc: Enable setting of xdp_prog (e45a4fed) · Commits · 戴 / test

drivers/net/ethernet/sfc/efx.c

+70 −0

Original line number	Diff line number	Diff line
		@@ -226,6 +226,8 @@ static void efx_fini_napi_channel(struct efx_channel *channel);
		static void efx_fini_struct(struct efx_nic *efx);
		static void efx_start_all(struct efx_nic *efx);
		static void efx_stop_all(struct efx_nic *efx);
		static int efx_xdp_setup_prog(struct efx_nic efx, struct bpf_prog prog);
		static int efx_xdp(struct net_device dev, struct netdev_bpf xdp);

		#define EFX_ASSERT_RESET_SERIALISED(efx) \
		do { \
		@@ -2025,6 +2027,10 @@ static void efx_stop_all(struct efx_nic *efx)

		static void efx_remove_all(struct efx_nic *efx)
		{
		rtnl_lock();
		efx_xdp_setup_prog(efx, NULL);
		rtnl_unlock();

		efx_remove_channels(efx);
		efx_remove_filters(efx);
		#ifdef CONFIG_SFC_SRIOV
		@@ -2280,6 +2286,17 @@ static void efx_watchdog(struct net_device *net_dev)
		efx_schedule_reset(efx, RESET_TYPE_TX_WATCHDOG);
		}

		static unsigned int efx_xdp_max_mtu(struct efx_nic *efx)
		{
		/* The maximum MTU that we can fit in a single page, allowing for
		* framing, overhead and XDP headroom.
		*/
		int overhead = EFX_MAX_FRAME_LEN(0) + sizeof(struct efx_rx_page_state) +
		efx->rx_prefix_size + efx->type->rx_buffer_padding +
		efx->rx_ip_align + XDP_PACKET_HEADROOM;

		return PAGE_SIZE - overhead;
		}

		/* Context: process, rtnl_lock() held. */
		static int efx_change_mtu(struct net_device *net_dev, int new_mtu)
		@@ -2291,6 +2308,14 @@ static int efx_change_mtu(struct net_device *net_dev, int new_mtu)
		if (rc)
		return rc;

		if (rtnl_dereference(efx->xdp_prog) &&
		new_mtu > efx_xdp_max_mtu(efx)) {
		netif_err(efx, drv, efx->net_dev,
		"Requested MTU of %d too big for XDP (max: %d)\n",
		new_mtu, efx_xdp_max_mtu(efx));
		return -EINVAL;
		}

		netif_dbg(efx, drv, efx->net_dev, "changing MTU to %d\n", new_mtu);

		efx_device_detach_sync(efx);
		@@ -2492,8 +2517,53 @@ static const struct net_device_ops efx_netdev_ops = {
		#endif
		.ndo_udp_tunnel_add = efx_udp_tunnel_add,
		.ndo_udp_tunnel_del = efx_udp_tunnel_del,
		.ndo_bpf = efx_xdp
		};

		static int efx_xdp_setup_prog(struct efx_nic efx, struct bpf_prog prog)
		{
		struct bpf_prog *old_prog;

		if (efx->xdp_rxq_info_failed) {
		netif_err(efx, drv, efx->net_dev,
		"Unable to bind XDP program due to previous failure of rxq_info\n");
		return -EINVAL;
		}

		if (prog && efx->net_dev->mtu > efx_xdp_max_mtu(efx)) {
		netif_err(efx, drv, efx->net_dev,
		"Unable to configure XDP with MTU of %d (max: %d)\n",
		efx->net_dev->mtu, efx_xdp_max_mtu(efx));
		return -EINVAL;
		}

		old_prog = rtnl_dereference(efx->xdp_prog);
		rcu_assign_pointer(efx->xdp_prog, prog);
		/* Release the reference that was originally passed by the caller. */
		if (old_prog)
		bpf_prog_put(old_prog);

		return 0;
		}

		/* Context: process, rtnl_lock() held. */
		static int efx_xdp(struct net_device dev, struct netdev_bpf xdp)
		{
		struct efx_nic *efx = netdev_priv(dev);
		struct bpf_prog *xdp_prog;

		switch (xdp->command) {
		case XDP_SETUP_PROG:
		return efx_xdp_setup_prog(efx, xdp->prog);
		case XDP_QUERY_PROG:
		xdp_prog = rtnl_dereference(efx->xdp_prog);
		xdp->prog_id = xdp_prog ? xdp_prog->aux->id : 0;
		return 0;
		default:
		return -EINVAL;
		}
		}

		static void efx_update_name(struct efx_nic *efx)
		{
		strcpy(efx->name, efx->net_dev->name);

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