From fefb695a745f10247fd68f5561e6e3d85e1d7b59 Mon Sep 17 00:00:00 2001 From: Stanislav Fomichev Date: Thu, 19 Jan 2023 14:15:28 -0800 Subject: [PATCH] veth: Introduce veth_xdp_buff wrapper for xdp_buff No functional changes. Boilerplate to allow stuffing more data after xdp_buff. Cc: Martin KaFai Lau Cc: Jakub Kicinski Cc: Willem de Bruijn Cc: Jesper Dangaard Brouer Cc: Anatoly Burakov Cc: Alexander Lobakin Cc: Magnus Karlsson Cc: Maryam Tahhan Cc: xdp-hints@xdp-project.net Cc: netdev@vger.kernel.org Signed-off-by: Stanislav Fomichev Link: https://lore.kernel.org/r/20230119221536.3349901-10-sdf@google.com Signed-off-by: Martin KaFai Lau --- drivers/net/veth.c | 56 ++++++++++++++++++++++++++++++------------------------ 1 file changed, 31 insertions(+), 25 deletions(-) diff --git a/drivers/net/veth.c b/drivers/net/veth.c index dfc7d87..70f5060 100644 --- a/drivers/net/veth.c +++ b/drivers/net/veth.c @@ -116,6 +116,10 @@ static struct { { "peer_ifindex" }, }; +struct veth_xdp_buff { + struct xdp_buff xdp; +}; + static int veth_get_link_ksettings(struct net_device *dev, struct ethtool_link_ksettings *cmd) { @@ -592,23 +596,24 @@ static struct xdp_frame *veth_xdp_rcv_one(struct veth_rq *rq, rcu_read_lock(); xdp_prog = rcu_dereference(rq->xdp_prog); if (likely(xdp_prog)) { - struct xdp_buff xdp; + struct veth_xdp_buff vxbuf; + struct xdp_buff *xdp = &vxbuf.xdp; u32 act; - xdp_convert_frame_to_buff(frame, &xdp); - xdp.rxq = &rq->xdp_rxq; + xdp_convert_frame_to_buff(frame, xdp); + xdp->rxq = &rq->xdp_rxq; - act = bpf_prog_run_xdp(xdp_prog, &xdp); + act = bpf_prog_run_xdp(xdp_prog, xdp); switch (act) { case XDP_PASS: - if (xdp_update_frame_from_buff(&xdp, frame)) + if (xdp_update_frame_from_buff(xdp, frame)) goto err_xdp; break; case XDP_TX: orig_frame = *frame; - xdp.rxq->mem = frame->mem; - if (unlikely(veth_xdp_tx(rq, &xdp, bq) < 0)) { + xdp->rxq->mem = frame->mem; + if (unlikely(veth_xdp_tx(rq, xdp, bq) < 0)) { trace_xdp_exception(rq->dev, xdp_prog, act); frame = &orig_frame; stats->rx_drops++; @@ -619,8 +624,8 @@ static struct xdp_frame *veth_xdp_rcv_one(struct veth_rq *rq, goto xdp_xmit; case XDP_REDIRECT: orig_frame = *frame; - xdp.rxq->mem = frame->mem; - if (xdp_do_redirect(rq->dev, &xdp, xdp_prog)) { + xdp->rxq->mem = frame->mem; + if (xdp_do_redirect(rq->dev, xdp, xdp_prog)) { frame = &orig_frame; stats->rx_drops++; goto err_xdp; @@ -801,7 +806,8 @@ static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq, { void *orig_data, *orig_data_end; struct bpf_prog *xdp_prog; - struct xdp_buff xdp; + struct veth_xdp_buff vxbuf; + struct xdp_buff *xdp = &vxbuf.xdp; u32 act, metalen; int off; @@ -815,22 +821,22 @@ static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq, } __skb_push(skb, skb->data - skb_mac_header(skb)); - if (veth_convert_skb_to_xdp_buff(rq, &xdp, &skb)) + if (veth_convert_skb_to_xdp_buff(rq, xdp, &skb)) goto drop; - orig_data = xdp.data; - orig_data_end = xdp.data_end; + orig_data = xdp->data; + orig_data_end = xdp->data_end; - act = bpf_prog_run_xdp(xdp_prog, &xdp); + act = bpf_prog_run_xdp(xdp_prog, xdp); switch (act) { case XDP_PASS: break; case XDP_TX: - veth_xdp_get(&xdp); + veth_xdp_get(xdp); consume_skb(skb); - xdp.rxq->mem = rq->xdp_mem; - if (unlikely(veth_xdp_tx(rq, &xdp, bq) < 0)) { + xdp->rxq->mem = rq->xdp_mem; + if (unlikely(veth_xdp_tx(rq, xdp, bq) < 0)) { trace_xdp_exception(rq->dev, xdp_prog, act); stats->rx_drops++; goto err_xdp; @@ -839,10 +845,10 @@ static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq, rcu_read_unlock(); goto xdp_xmit; case XDP_REDIRECT: - veth_xdp_get(&xdp); + veth_xdp_get(xdp); consume_skb(skb); - xdp.rxq->mem = rq->xdp_mem; - if (xdp_do_redirect(rq->dev, &xdp, xdp_prog)) { + xdp->rxq->mem = rq->xdp_mem; + if (xdp_do_redirect(rq->dev, xdp, xdp_prog)) { stats->rx_drops++; goto err_xdp; } @@ -862,7 +868,7 @@ static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq, rcu_read_unlock(); /* check if bpf_xdp_adjust_head was used */ - off = orig_data - xdp.data; + off = orig_data - xdp->data; if (off > 0) __skb_push(skb, off); else if (off < 0) @@ -871,21 +877,21 @@ static struct sk_buff *veth_xdp_rcv_skb(struct veth_rq *rq, skb_reset_mac_header(skb); /* check if bpf_xdp_adjust_tail was used */ - off = xdp.data_end - orig_data_end; + off = xdp->data_end - orig_data_end; if (off != 0) __skb_put(skb, off); /* positive on grow, negative on shrink */ /* XDP frag metadata (e.g. nr_frags) are updated in eBPF helpers * (e.g. bpf_xdp_adjust_tail), we need to update data_len here. */ - if (xdp_buff_has_frags(&xdp)) + if (xdp_buff_has_frags(xdp)) skb->data_len = skb_shinfo(skb)->xdp_frags_size; else skb->data_len = 0; skb->protocol = eth_type_trans(skb, rq->dev); - metalen = xdp.data - xdp.data_meta; + metalen = xdp->data - xdp->data_meta; if (metalen) skb_metadata_set(skb, metalen); out: @@ -898,7 +904,7 @@ xdp_drop: return NULL; err_xdp: rcu_read_unlock(); - xdp_return_buff(&xdp); + xdp_return_buff(xdp); xdp_xmit: return NULL; } -- 2.7.4