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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /include/net/xdp.h
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'include/net/xdp.h')
-rw-r--r--include/net/xdp.h498
1 files changed, 498 insertions, 0 deletions
diff --git a/include/net/xdp.h b/include/net/xdp.h
new file mode 100644
index 0000000000..de08c8e0d1
--- /dev/null
+++ b/include/net/xdp.h
@@ -0,0 +1,498 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/* include/net/xdp.h
+ *
+ * Copyright (c) 2017 Jesper Dangaard Brouer, Red Hat Inc.
+ */
+#ifndef __LINUX_NET_XDP_H__
+#define __LINUX_NET_XDP_H__
+
+#include <linux/bitfield.h>
+#include <linux/filter.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h> /* skb_shared_info */
+
+/**
+ * DOC: XDP RX-queue information
+ *
+ * The XDP RX-queue info (xdp_rxq_info) is associated with the driver
+ * level RX-ring queues. It is information that is specific to how
+ * the driver have configured a given RX-ring queue.
+ *
+ * Each xdp_buff frame received in the driver carries a (pointer)
+ * reference to this xdp_rxq_info structure. This provides the XDP
+ * data-path read-access to RX-info for both kernel and bpf-side
+ * (limited subset).
+ *
+ * For now, direct access is only safe while running in NAPI/softirq
+ * context. Contents are read-mostly and must not be updated during
+ * driver NAPI/softirq poll.
+ *
+ * The driver usage API is a register and unregister API.
+ *
+ * The struct is not directly tied to the XDP prog. A new XDP prog
+ * can be attached as long as it doesn't change the underlying
+ * RX-ring. If the RX-ring does change significantly, the NIC driver
+ * naturally need to stop the RX-ring before purging and reallocating
+ * memory. In that process the driver MUST call unregister (which
+ * also applies for driver shutdown and unload). The register API is
+ * also mandatory during RX-ring setup.
+ */
+
+enum xdp_mem_type {
+ MEM_TYPE_PAGE_SHARED = 0, /* Split-page refcnt based model */
+ MEM_TYPE_PAGE_ORDER0, /* Orig XDP full page model */
+ MEM_TYPE_PAGE_POOL,
+ MEM_TYPE_XSK_BUFF_POOL,
+ MEM_TYPE_MAX,
+};
+
+/* XDP flags for ndo_xdp_xmit */
+#define XDP_XMIT_FLUSH (1U << 0) /* doorbell signal consumer */
+#define XDP_XMIT_FLAGS_MASK XDP_XMIT_FLUSH
+
+struct xdp_mem_info {
+ u32 type; /* enum xdp_mem_type, but known size type */
+ u32 id;
+};
+
+struct page_pool;
+
+struct xdp_rxq_info {
+ struct net_device *dev;
+ u32 queue_index;
+ u32 reg_state;
+ struct xdp_mem_info mem;
+ unsigned int napi_id;
+ u32 frag_size;
+} ____cacheline_aligned; /* perf critical, avoid false-sharing */
+
+struct xdp_txq_info {
+ struct net_device *dev;
+};
+
+enum xdp_buff_flags {
+ XDP_FLAGS_HAS_FRAGS = BIT(0), /* non-linear xdp buff */
+ XDP_FLAGS_FRAGS_PF_MEMALLOC = BIT(1), /* xdp paged memory is under
+ * pressure
+ */
+};
+
+struct xdp_buff {
+ void *data;
+ void *data_end;
+ void *data_meta;
+ void *data_hard_start;
+ struct xdp_rxq_info *rxq;
+ struct xdp_txq_info *txq;
+ u32 frame_sz; /* frame size to deduce data_hard_end/reserved tailroom*/
+ u32 flags; /* supported values defined in xdp_buff_flags */
+};
+
+static __always_inline bool xdp_buff_has_frags(struct xdp_buff *xdp)
+{
+ return !!(xdp->flags & XDP_FLAGS_HAS_FRAGS);
+}
+
+static __always_inline void xdp_buff_set_frags_flag(struct xdp_buff *xdp)
+{
+ xdp->flags |= XDP_FLAGS_HAS_FRAGS;
+}
+
+static __always_inline void xdp_buff_clear_frags_flag(struct xdp_buff *xdp)
+{
+ xdp->flags &= ~XDP_FLAGS_HAS_FRAGS;
+}
+
+static __always_inline bool xdp_buff_is_frag_pfmemalloc(struct xdp_buff *xdp)
+{
+ return !!(xdp->flags & XDP_FLAGS_FRAGS_PF_MEMALLOC);
+}
+
+static __always_inline void xdp_buff_set_frag_pfmemalloc(struct xdp_buff *xdp)
+{
+ xdp->flags |= XDP_FLAGS_FRAGS_PF_MEMALLOC;
+}
+
+static __always_inline void
+xdp_init_buff(struct xdp_buff *xdp, u32 frame_sz, struct xdp_rxq_info *rxq)
+{
+ xdp->frame_sz = frame_sz;
+ xdp->rxq = rxq;
+ xdp->flags = 0;
+}
+
+static __always_inline void
+xdp_prepare_buff(struct xdp_buff *xdp, unsigned char *hard_start,
+ int headroom, int data_len, const bool meta_valid)
+{
+ unsigned char *data = hard_start + headroom;
+
+ xdp->data_hard_start = hard_start;
+ xdp->data = data;
+ xdp->data_end = data + data_len;
+ xdp->data_meta = meta_valid ? data : data + 1;
+}
+
+/* Reserve memory area at end-of data area.
+ *
+ * This macro reserves tailroom in the XDP buffer by limiting the
+ * XDP/BPF data access to data_hard_end. Notice same area (and size)
+ * is used for XDP_PASS, when constructing the SKB via build_skb().
+ */
+#define xdp_data_hard_end(xdp) \
+ ((xdp)->data_hard_start + (xdp)->frame_sz - \
+ SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
+
+static inline struct skb_shared_info *
+xdp_get_shared_info_from_buff(struct xdp_buff *xdp)
+{
+ return (struct skb_shared_info *)xdp_data_hard_end(xdp);
+}
+
+static __always_inline unsigned int xdp_get_buff_len(struct xdp_buff *xdp)
+{
+ unsigned int len = xdp->data_end - xdp->data;
+ struct skb_shared_info *sinfo;
+
+ if (likely(!xdp_buff_has_frags(xdp)))
+ goto out;
+
+ sinfo = xdp_get_shared_info_from_buff(xdp);
+ len += sinfo->xdp_frags_size;
+out:
+ return len;
+}
+
+struct xdp_frame {
+ void *data;
+ u16 len;
+ u16 headroom;
+ u32 metasize; /* uses lower 8-bits */
+ /* Lifetime of xdp_rxq_info is limited to NAPI/enqueue time,
+ * while mem info is valid on remote CPU.
+ */
+ struct xdp_mem_info mem;
+ struct net_device *dev_rx; /* used by cpumap */
+ u32 frame_sz;
+ u32 flags; /* supported values defined in xdp_buff_flags */
+};
+
+static __always_inline bool xdp_frame_has_frags(struct xdp_frame *frame)
+{
+ return !!(frame->flags & XDP_FLAGS_HAS_FRAGS);
+}
+
+static __always_inline bool xdp_frame_is_frag_pfmemalloc(struct xdp_frame *frame)
+{
+ return !!(frame->flags & XDP_FLAGS_FRAGS_PF_MEMALLOC);
+}
+
+#define XDP_BULK_QUEUE_SIZE 16
+struct xdp_frame_bulk {
+ int count;
+ void *xa;
+ void *q[XDP_BULK_QUEUE_SIZE];
+};
+
+static __always_inline void xdp_frame_bulk_init(struct xdp_frame_bulk *bq)
+{
+ /* bq->count will be zero'ed when bq->xa gets updated */
+ bq->xa = NULL;
+}
+
+static inline struct skb_shared_info *
+xdp_get_shared_info_from_frame(struct xdp_frame *frame)
+{
+ void *data_hard_start = frame->data - frame->headroom - sizeof(*frame);
+
+ return (struct skb_shared_info *)(data_hard_start + frame->frame_sz -
+ SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
+}
+
+struct xdp_cpumap_stats {
+ unsigned int redirect;
+ unsigned int pass;
+ unsigned int drop;
+};
+
+/* Clear kernel pointers in xdp_frame */
+static inline void xdp_scrub_frame(struct xdp_frame *frame)
+{
+ frame->data = NULL;
+ frame->dev_rx = NULL;
+}
+
+static inline void
+xdp_update_skb_shared_info(struct sk_buff *skb, u8 nr_frags,
+ unsigned int size, unsigned int truesize,
+ bool pfmemalloc)
+{
+ skb_shinfo(skb)->nr_frags = nr_frags;
+
+ skb->len += size;
+ skb->data_len += size;
+ skb->truesize += truesize;
+ skb->pfmemalloc |= pfmemalloc;
+}
+
+/* Avoids inlining WARN macro in fast-path */
+void xdp_warn(const char *msg, const char *func, const int line);
+#define XDP_WARN(msg) xdp_warn(msg, __func__, __LINE__)
+
+struct xdp_frame *xdp_convert_zc_to_xdp_frame(struct xdp_buff *xdp);
+struct sk_buff *__xdp_build_skb_from_frame(struct xdp_frame *xdpf,
+ struct sk_buff *skb,
+ struct net_device *dev);
+struct sk_buff *xdp_build_skb_from_frame(struct xdp_frame *xdpf,
+ struct net_device *dev);
+int xdp_alloc_skb_bulk(void **skbs, int n_skb, gfp_t gfp);
+struct xdp_frame *xdpf_clone(struct xdp_frame *xdpf);
+
+static inline
+void xdp_convert_frame_to_buff(struct xdp_frame *frame, struct xdp_buff *xdp)
+{
+ xdp->data_hard_start = frame->data - frame->headroom - sizeof(*frame);
+ xdp->data = frame->data;
+ xdp->data_end = frame->data + frame->len;
+ xdp->data_meta = frame->data - frame->metasize;
+ xdp->frame_sz = frame->frame_sz;
+ xdp->flags = frame->flags;
+}
+
+static inline
+int xdp_update_frame_from_buff(struct xdp_buff *xdp,
+ struct xdp_frame *xdp_frame)
+{
+ int metasize, headroom;
+
+ /* Assure headroom is available for storing info */
+ headroom = xdp->data - xdp->data_hard_start;
+ metasize = xdp->data - xdp->data_meta;
+ metasize = metasize > 0 ? metasize : 0;
+ if (unlikely((headroom - metasize) < sizeof(*xdp_frame)))
+ return -ENOSPC;
+
+ /* Catch if driver didn't reserve tailroom for skb_shared_info */
+ if (unlikely(xdp->data_end > xdp_data_hard_end(xdp))) {
+ XDP_WARN("Driver BUG: missing reserved tailroom");
+ return -ENOSPC;
+ }
+
+ xdp_frame->data = xdp->data;
+ xdp_frame->len = xdp->data_end - xdp->data;
+ xdp_frame->headroom = headroom - sizeof(*xdp_frame);
+ xdp_frame->metasize = metasize;
+ xdp_frame->frame_sz = xdp->frame_sz;
+ xdp_frame->flags = xdp->flags;
+
+ return 0;
+}
+
+/* Convert xdp_buff to xdp_frame */
+static inline
+struct xdp_frame *xdp_convert_buff_to_frame(struct xdp_buff *xdp)
+{
+ struct xdp_frame *xdp_frame;
+
+ if (xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL)
+ return xdp_convert_zc_to_xdp_frame(xdp);
+
+ /* Store info in top of packet */
+ xdp_frame = xdp->data_hard_start;
+ if (unlikely(xdp_update_frame_from_buff(xdp, xdp_frame) < 0))
+ return NULL;
+
+ /* rxq only valid until napi_schedule ends, convert to xdp_mem_info */
+ xdp_frame->mem = xdp->rxq->mem;
+
+ return xdp_frame;
+}
+
+void __xdp_return(void *data, struct xdp_mem_info *mem, bool napi_direct,
+ struct xdp_buff *xdp);
+void xdp_return_frame(struct xdp_frame *xdpf);
+void xdp_return_frame_rx_napi(struct xdp_frame *xdpf);
+void xdp_return_buff(struct xdp_buff *xdp);
+void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq);
+void xdp_return_frame_bulk(struct xdp_frame *xdpf,
+ struct xdp_frame_bulk *bq);
+
+static __always_inline unsigned int xdp_get_frame_len(struct xdp_frame *xdpf)
+{
+ struct skb_shared_info *sinfo;
+ unsigned int len = xdpf->len;
+
+ if (likely(!xdp_frame_has_frags(xdpf)))
+ goto out;
+
+ sinfo = xdp_get_shared_info_from_frame(xdpf);
+ len += sinfo->xdp_frags_size;
+out:
+ return len;
+}
+
+int __xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq,
+ struct net_device *dev, u32 queue_index,
+ unsigned int napi_id, u32 frag_size);
+static inline int
+xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq,
+ struct net_device *dev, u32 queue_index,
+ unsigned int napi_id)
+{
+ return __xdp_rxq_info_reg(xdp_rxq, dev, queue_index, napi_id, 0);
+}
+
+void xdp_rxq_info_unreg(struct xdp_rxq_info *xdp_rxq);
+void xdp_rxq_info_unused(struct xdp_rxq_info *xdp_rxq);
+bool xdp_rxq_info_is_reg(struct xdp_rxq_info *xdp_rxq);
+int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq,
+ enum xdp_mem_type type, void *allocator);
+void xdp_rxq_info_unreg_mem_model(struct xdp_rxq_info *xdp_rxq);
+int xdp_reg_mem_model(struct xdp_mem_info *mem,
+ enum xdp_mem_type type, void *allocator);
+void xdp_unreg_mem_model(struct xdp_mem_info *mem);
+
+/* Drivers not supporting XDP metadata can use this helper, which
+ * rejects any room expansion for metadata as a result.
+ */
+static __always_inline void
+xdp_set_data_meta_invalid(struct xdp_buff *xdp)
+{
+ xdp->data_meta = xdp->data + 1;
+}
+
+static __always_inline bool
+xdp_data_meta_unsupported(const struct xdp_buff *xdp)
+{
+ return unlikely(xdp->data_meta > xdp->data);
+}
+
+static inline bool xdp_metalen_invalid(unsigned long metalen)
+{
+ return (metalen & (sizeof(__u32) - 1)) || (metalen > 32);
+}
+
+struct xdp_attachment_info {
+ struct bpf_prog *prog;
+ u32 flags;
+};
+
+struct netdev_bpf;
+void xdp_attachment_setup(struct xdp_attachment_info *info,
+ struct netdev_bpf *bpf);
+
+#define DEV_MAP_BULK_SIZE XDP_BULK_QUEUE_SIZE
+
+#define XDP_METADATA_KFUNC_xxx \
+ XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_TIMESTAMP, \
+ bpf_xdp_metadata_rx_timestamp) \
+ XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_HASH, \
+ bpf_xdp_metadata_rx_hash) \
+
+enum {
+#define XDP_METADATA_KFUNC(name, _) name,
+XDP_METADATA_KFUNC_xxx
+#undef XDP_METADATA_KFUNC
+MAX_XDP_METADATA_KFUNC,
+};
+
+enum xdp_rss_hash_type {
+ /* First part: Individual bits for L3/L4 types */
+ XDP_RSS_L3_IPV4 = BIT(0),
+ XDP_RSS_L3_IPV6 = BIT(1),
+
+ /* The fixed (L3) IPv4 and IPv6 headers can both be followed by
+ * variable/dynamic headers, IPv4 called Options and IPv6 called
+ * Extension Headers. HW RSS type can contain this info.
+ */
+ XDP_RSS_L3_DYNHDR = BIT(2),
+
+ /* When RSS hash covers L4 then drivers MUST set XDP_RSS_L4 bit in
+ * addition to the protocol specific bit. This ease interaction with
+ * SKBs and avoids reserving a fixed mask for future L4 protocol bits.
+ */
+ XDP_RSS_L4 = BIT(3), /* L4 based hash, proto can be unknown */
+ XDP_RSS_L4_TCP = BIT(4),
+ XDP_RSS_L4_UDP = BIT(5),
+ XDP_RSS_L4_SCTP = BIT(6),
+ XDP_RSS_L4_IPSEC = BIT(7), /* L4 based hash include IPSEC SPI */
+
+ /* Second part: RSS hash type combinations used for driver HW mapping */
+ XDP_RSS_TYPE_NONE = 0,
+ XDP_RSS_TYPE_L2 = XDP_RSS_TYPE_NONE,
+
+ XDP_RSS_TYPE_L3_IPV4 = XDP_RSS_L3_IPV4,
+ XDP_RSS_TYPE_L3_IPV6 = XDP_RSS_L3_IPV6,
+ XDP_RSS_TYPE_L3_IPV4_OPT = XDP_RSS_L3_IPV4 | XDP_RSS_L3_DYNHDR,
+ XDP_RSS_TYPE_L3_IPV6_EX = XDP_RSS_L3_IPV6 | XDP_RSS_L3_DYNHDR,
+
+ XDP_RSS_TYPE_L4_ANY = XDP_RSS_L4,
+ XDP_RSS_TYPE_L4_IPV4_TCP = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_TCP,
+ XDP_RSS_TYPE_L4_IPV4_UDP = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_UDP,
+ XDP_RSS_TYPE_L4_IPV4_SCTP = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_SCTP,
+ XDP_RSS_TYPE_L4_IPV4_IPSEC = XDP_RSS_L3_IPV4 | XDP_RSS_L4 | XDP_RSS_L4_IPSEC,
+
+ XDP_RSS_TYPE_L4_IPV6_TCP = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_TCP,
+ XDP_RSS_TYPE_L4_IPV6_UDP = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_UDP,
+ XDP_RSS_TYPE_L4_IPV6_SCTP = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_SCTP,
+ XDP_RSS_TYPE_L4_IPV6_IPSEC = XDP_RSS_L3_IPV6 | XDP_RSS_L4 | XDP_RSS_L4_IPSEC,
+
+ XDP_RSS_TYPE_L4_IPV6_TCP_EX = XDP_RSS_TYPE_L4_IPV6_TCP | XDP_RSS_L3_DYNHDR,
+ XDP_RSS_TYPE_L4_IPV6_UDP_EX = XDP_RSS_TYPE_L4_IPV6_UDP | XDP_RSS_L3_DYNHDR,
+ XDP_RSS_TYPE_L4_IPV6_SCTP_EX = XDP_RSS_TYPE_L4_IPV6_SCTP | XDP_RSS_L3_DYNHDR,
+};
+
+struct xdp_metadata_ops {
+ int (*xmo_rx_timestamp)(const struct xdp_md *ctx, u64 *timestamp);
+ int (*xmo_rx_hash)(const struct xdp_md *ctx, u32 *hash,
+ enum xdp_rss_hash_type *rss_type);
+};
+
+#ifdef CONFIG_NET
+u32 bpf_xdp_metadata_kfunc_id(int id);
+bool bpf_dev_bound_kfunc_id(u32 btf_id);
+void xdp_set_features_flag(struct net_device *dev, xdp_features_t val);
+void xdp_features_set_redirect_target(struct net_device *dev, bool support_sg);
+void xdp_features_clear_redirect_target(struct net_device *dev);
+#else
+static inline u32 bpf_xdp_metadata_kfunc_id(int id) { return 0; }
+static inline bool bpf_dev_bound_kfunc_id(u32 btf_id) { return false; }
+
+static inline void
+xdp_set_features_flag(struct net_device *dev, xdp_features_t val)
+{
+}
+
+static inline void
+xdp_features_set_redirect_target(struct net_device *dev, bool support_sg)
+{
+}
+
+static inline void
+xdp_features_clear_redirect_target(struct net_device *dev)
+{
+}
+#endif
+
+static inline void xdp_clear_features_flag(struct net_device *dev)
+{
+ xdp_set_features_flag(dev, 0);
+}
+
+static __always_inline u32 bpf_prog_run_xdp(const struct bpf_prog *prog,
+ struct xdp_buff *xdp)
+{
+ /* Driver XDP hooks are invoked within a single NAPI poll cycle and thus
+ * under local_bh_disable(), which provides the needed RCU protection
+ * for accessing map entries.
+ */
+ u32 act = __bpf_prog_run(prog, xdp, BPF_DISPATCHER_FUNC(xdp));
+
+ if (static_branch_unlikely(&bpf_master_redirect_enabled_key)) {
+ if (act == XDP_TX && netif_is_bond_slave(xdp->rxq->dev))
+ act = xdp_master_redirect(xdp);
+ }
+
+ return act;
+}
+#endif /* __LINUX_NET_XDP_H__ */