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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/net/hyperv/netvsc_bpf.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/net/hyperv/netvsc_bpf.c')
-rw-r--r-- | drivers/net/hyperv/netvsc_bpf.c | 292 |
1 files changed, 292 insertions, 0 deletions
diff --git a/drivers/net/hyperv/netvsc_bpf.c b/drivers/net/hyperv/netvsc_bpf.c new file mode 100644 index 000000000..4a9522689 --- /dev/null +++ b/drivers/net/hyperv/netvsc_bpf.c @@ -0,0 +1,292 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* Copyright (c) 2019, Microsoft Corporation. + * + * Author: + * Haiyang Zhang <haiyangz@microsoft.com> + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include <linux/netdevice.h> +#include <linux/etherdevice.h> +#include <linux/ethtool.h> +#include <linux/netpoll.h> +#include <linux/bpf.h> +#include <linux/bpf_trace.h> +#include <linux/kernel.h> +#include <net/xdp.h> + +#include <linux/mutex.h> +#include <linux/rtnetlink.h> + +#include "hyperv_net.h" + +u32 netvsc_run_xdp(struct net_device *ndev, struct netvsc_channel *nvchan, + struct xdp_buff *xdp) +{ + struct netvsc_stats_rx *rx_stats = &nvchan->rx_stats; + void *data = nvchan->rsc.data[0]; + u32 len = nvchan->rsc.len[0]; + struct page *page = NULL; + struct bpf_prog *prog; + u32 act = XDP_PASS; + bool drop = true; + + xdp->data_hard_start = NULL; + + rcu_read_lock(); + prog = rcu_dereference(nvchan->bpf_prog); + + if (!prog) + goto out; + + /* Ensure that the below memcpy() won't overflow the page buffer. */ + if (len > ndev->mtu + ETH_HLEN) { + act = XDP_DROP; + goto out; + } + + /* allocate page buffer for data */ + page = alloc_page(GFP_ATOMIC); + if (!page) { + act = XDP_DROP; + goto out; + } + + xdp_init_buff(xdp, PAGE_SIZE, &nvchan->xdp_rxq); + xdp_prepare_buff(xdp, page_address(page), NETVSC_XDP_HDRM, len, false); + + memcpy(xdp->data, data, len); + + act = bpf_prog_run_xdp(prog, xdp); + + switch (act) { + case XDP_PASS: + case XDP_TX: + drop = false; + break; + + case XDP_DROP: + break; + + case XDP_REDIRECT: + if (!xdp_do_redirect(ndev, xdp, prog)) { + nvchan->xdp_flush = true; + drop = false; + + u64_stats_update_begin(&rx_stats->syncp); + + rx_stats->xdp_redirect++; + rx_stats->packets++; + rx_stats->bytes += nvchan->rsc.pktlen; + + u64_stats_update_end(&rx_stats->syncp); + + break; + } else { + u64_stats_update_begin(&rx_stats->syncp); + rx_stats->xdp_drop++; + u64_stats_update_end(&rx_stats->syncp); + } + + fallthrough; + + case XDP_ABORTED: + trace_xdp_exception(ndev, prog, act); + break; + + default: + bpf_warn_invalid_xdp_action(ndev, prog, act); + } + +out: + rcu_read_unlock(); + + if (page && drop) { + __free_page(page); + xdp->data_hard_start = NULL; + } + + return act; +} + +unsigned int netvsc_xdp_fraglen(unsigned int len) +{ + return SKB_DATA_ALIGN(len) + + SKB_DATA_ALIGN(sizeof(struct skb_shared_info)); +} + +struct bpf_prog *netvsc_xdp_get(struct netvsc_device *nvdev) +{ + return rtnl_dereference(nvdev->chan_table[0].bpf_prog); +} + +int netvsc_xdp_set(struct net_device *dev, struct bpf_prog *prog, + struct netlink_ext_ack *extack, + struct netvsc_device *nvdev) +{ + struct bpf_prog *old_prog; + int buf_max, i; + + old_prog = netvsc_xdp_get(nvdev); + + if (!old_prog && !prog) + return 0; + + buf_max = NETVSC_XDP_HDRM + netvsc_xdp_fraglen(dev->mtu + ETH_HLEN); + if (prog && buf_max > PAGE_SIZE) { + netdev_err(dev, "XDP: mtu:%u too large, buf_max:%u\n", + dev->mtu, buf_max); + NL_SET_ERR_MSG_MOD(extack, "XDP: mtu too large"); + + return -EOPNOTSUPP; + } + + if (prog && (dev->features & NETIF_F_LRO)) { + netdev_err(dev, "XDP: not support LRO\n"); + NL_SET_ERR_MSG_MOD(extack, "XDP: not support LRO"); + + return -EOPNOTSUPP; + } + + if (prog) + bpf_prog_add(prog, nvdev->num_chn - 1); + + for (i = 0; i < nvdev->num_chn; i++) + rcu_assign_pointer(nvdev->chan_table[i].bpf_prog, prog); + + if (old_prog) + for (i = 0; i < nvdev->num_chn; i++) + bpf_prog_put(old_prog); + + return 0; +} + +int netvsc_vf_setxdp(struct net_device *vf_netdev, struct bpf_prog *prog) +{ + struct netdev_bpf xdp; + int ret; + + ASSERT_RTNL(); + + if (!vf_netdev) + return 0; + + if (!vf_netdev->netdev_ops->ndo_bpf) + return 0; + + memset(&xdp, 0, sizeof(xdp)); + + if (prog) + bpf_prog_inc(prog); + + xdp.command = XDP_SETUP_PROG; + xdp.prog = prog; + + ret = vf_netdev->netdev_ops->ndo_bpf(vf_netdev, &xdp); + + if (ret && prog) + bpf_prog_put(prog); + + return ret; +} + +int netvsc_bpf(struct net_device *dev, struct netdev_bpf *bpf) +{ + struct net_device_context *ndevctx = netdev_priv(dev); + struct netvsc_device *nvdev = rtnl_dereference(ndevctx->nvdev); + struct net_device *vf_netdev = rtnl_dereference(ndevctx->vf_netdev); + struct netlink_ext_ack *extack = bpf->extack; + int ret; + + if (!nvdev || nvdev->destroy) { + return -ENODEV; + } + + switch (bpf->command) { + case XDP_SETUP_PROG: + ret = netvsc_xdp_set(dev, bpf->prog, extack, nvdev); + + if (ret) + return ret; + + ret = netvsc_vf_setxdp(vf_netdev, bpf->prog); + + if (ret) { + netdev_err(dev, "vf_setxdp failed:%d\n", ret); + NL_SET_ERR_MSG_MOD(extack, "vf_setxdp failed"); + + netvsc_xdp_set(dev, NULL, extack, nvdev); + } + + return ret; + + default: + return -EINVAL; + } +} + +static int netvsc_ndoxdp_xmit_fm(struct net_device *ndev, + struct xdp_frame *frame, u16 q_idx) +{ + struct sk_buff *skb; + + skb = xdp_build_skb_from_frame(frame, ndev); + if (unlikely(!skb)) + return -ENOMEM; + + netvsc_get_hash(skb, netdev_priv(ndev)); + + skb_record_rx_queue(skb, q_idx); + + netvsc_xdp_xmit(skb, ndev); + + return 0; +} + +int netvsc_ndoxdp_xmit(struct net_device *ndev, int n, + struct xdp_frame **frames, u32 flags) +{ + struct net_device_context *ndev_ctx = netdev_priv(ndev); + const struct net_device_ops *vf_ops; + struct netvsc_stats_tx *tx_stats; + struct netvsc_device *nvsc_dev; + struct net_device *vf_netdev; + int i, count = 0; + u16 q_idx; + + /* Don't transmit if netvsc_device is gone */ + nvsc_dev = rcu_dereference_bh(ndev_ctx->nvdev); + if (unlikely(!nvsc_dev || nvsc_dev->destroy)) + return 0; + + /* If VF is present and up then redirect packets to it. + * Skip the VF if it is marked down or has no carrier. + * If netpoll is in uses, then VF can not be used either. + */ + vf_netdev = rcu_dereference_bh(ndev_ctx->vf_netdev); + if (vf_netdev && netif_running(vf_netdev) && + netif_carrier_ok(vf_netdev) && !netpoll_tx_running(ndev) && + vf_netdev->netdev_ops->ndo_xdp_xmit && + ndev_ctx->data_path_is_vf) { + vf_ops = vf_netdev->netdev_ops; + return vf_ops->ndo_xdp_xmit(vf_netdev, n, frames, flags); + } + + q_idx = smp_processor_id() % ndev->real_num_tx_queues; + + for (i = 0; i < n; i++) { + if (netvsc_ndoxdp_xmit_fm(ndev, frames[i], q_idx)) + break; + + count++; + } + + tx_stats = &nvsc_dev->chan_table[q_idx].tx_stats; + + u64_stats_update_begin(&tx_stats->syncp); + tx_stats->xdp_xmit += count; + u64_stats_update_end(&tx_stats->syncp); + + return count; +} |