1ddc64d0aSThomas Gleixner /* SPDX-License-Identifier: GPL-2.0-only */ 2aecd67b6SJesper Dangaard Brouer /* include/net/xdp.h 3aecd67b6SJesper Dangaard Brouer * 4aecd67b6SJesper Dangaard Brouer * Copyright (c) 2017 Jesper Dangaard Brouer, Red Hat Inc. 5aecd67b6SJesper Dangaard Brouer */ 6aecd67b6SJesper Dangaard Brouer #ifndef __LINUX_NET_XDP_H__ 7aecd67b6SJesper Dangaard Brouer #define __LINUX_NET_XDP_H__ 8aecd67b6SJesper Dangaard Brouer 9f95f0f95SJesper Dangaard Brouer #include <linux/skbuff.h> /* skb_shared_info */ 10d3d854fdSJakub Kicinski #include <uapi/linux/netdev.h> 11f95f0f95SJesper Dangaard Brouer 12aecd67b6SJesper Dangaard Brouer /** 13aecd67b6SJesper Dangaard Brouer * DOC: XDP RX-queue information 14aecd67b6SJesper Dangaard Brouer * 15aecd67b6SJesper Dangaard Brouer * The XDP RX-queue info (xdp_rxq_info) is associated with the driver 16aecd67b6SJesper Dangaard Brouer * level RX-ring queues. It is information that is specific to how 17aecd67b6SJesper Dangaard Brouer * the driver have configured a given RX-ring queue. 18aecd67b6SJesper Dangaard Brouer * 196bbc7103SKev Jackson * Each xdp_buff frame received in the driver carries a (pointer) 20aecd67b6SJesper Dangaard Brouer * reference to this xdp_rxq_info structure. This provides the XDP 21aecd67b6SJesper Dangaard Brouer * data-path read-access to RX-info for both kernel and bpf-side 22aecd67b6SJesper Dangaard Brouer * (limited subset). 23aecd67b6SJesper Dangaard Brouer * 24aecd67b6SJesper Dangaard Brouer * For now, direct access is only safe while running in NAPI/softirq 256bbc7103SKev Jackson * context. Contents are read-mostly and must not be updated during 26aecd67b6SJesper Dangaard Brouer * driver NAPI/softirq poll. 27aecd67b6SJesper Dangaard Brouer * 28aecd67b6SJesper Dangaard Brouer * The driver usage API is a register and unregister API. 29aecd67b6SJesper Dangaard Brouer * 30aecd67b6SJesper Dangaard Brouer * The struct is not directly tied to the XDP prog. A new XDP prog 31aecd67b6SJesper Dangaard Brouer * can be attached as long as it doesn't change the underlying 32aecd67b6SJesper Dangaard Brouer * RX-ring. If the RX-ring does change significantly, the NIC driver 33aecd67b6SJesper Dangaard Brouer * naturally need to stop the RX-ring before purging and reallocating 346bbc7103SKev Jackson * memory. In that process the driver MUST call unregister (which 356bbc7103SKev Jackson * also applies for driver shutdown and unload). The register API is 36aecd67b6SJesper Dangaard Brouer * also mandatory during RX-ring setup. 37aecd67b6SJesper Dangaard Brouer */ 38aecd67b6SJesper Dangaard Brouer 395ab073ffSJesper Dangaard Brouer enum xdp_mem_type { 405ab073ffSJesper Dangaard Brouer MEM_TYPE_PAGE_SHARED = 0, /* Split-page refcnt based model */ 415ab073ffSJesper Dangaard Brouer MEM_TYPE_PAGE_ORDER0, /* Orig XDP full page model */ 4257d0a1c1SJesper Dangaard Brouer MEM_TYPE_PAGE_POOL, 432b43470aSBjörn Töpel MEM_TYPE_XSK_BUFF_POOL, 445ab073ffSJesper Dangaard Brouer MEM_TYPE_MAX, 455ab073ffSJesper Dangaard Brouer }; 465ab073ffSJesper Dangaard Brouer 47d3d854fdSJakub Kicinski typedef u32 xdp_features_t; 48d3d854fdSJakub Kicinski 4942b33468SJesper Dangaard Brouer /* XDP flags for ndo_xdp_xmit */ 5042b33468SJesper Dangaard Brouer #define XDP_XMIT_FLUSH (1U << 0) /* doorbell signal consumer */ 5142b33468SJesper Dangaard Brouer #define XDP_XMIT_FLAGS_MASK XDP_XMIT_FLUSH 5242b33468SJesper Dangaard Brouer 535ab073ffSJesper Dangaard Brouer struct xdp_mem_info { 545ab073ffSJesper Dangaard Brouer u32 type; /* enum xdp_mem_type, but known size type */ 558d5d8852SJesper Dangaard Brouer u32 id; 565ab073ffSJesper Dangaard Brouer }; 575ab073ffSJesper Dangaard Brouer 5857d0a1c1SJesper Dangaard Brouer struct page_pool; 5957d0a1c1SJesper Dangaard Brouer 60aecd67b6SJesper Dangaard Brouer struct xdp_rxq_info { 61aecd67b6SJesper Dangaard Brouer struct net_device *dev; 62aecd67b6SJesper Dangaard Brouer u32 queue_index; 63aecd67b6SJesper Dangaard Brouer u32 reg_state; 645ab073ffSJesper Dangaard Brouer struct xdp_mem_info mem; 65b02e5a0eSBjörn Töpel unsigned int napi_id; 66bf25146aSEelco Chaudron u32 frag_size; 67aecd67b6SJesper Dangaard Brouer } ____cacheline_aligned; /* perf critical, avoid false-sharing */ 68aecd67b6SJesper Dangaard Brouer 6964b59025SDavid Ahern struct xdp_txq_info { 7064b59025SDavid Ahern struct net_device *dev; 7164b59025SDavid Ahern }; 7264b59025SDavid Ahern 732e88d4ffSLorenzo Bianconi enum xdp_buff_flags { 742e88d4ffSLorenzo Bianconi XDP_FLAGS_HAS_FRAGS = BIT(0), /* non-linear xdp buff */ 75d65a1906SLorenzo Bianconi XDP_FLAGS_FRAGS_PF_MEMALLOC = BIT(1), /* xdp paged memory is under 76d65a1906SLorenzo Bianconi * pressure 77d65a1906SLorenzo Bianconi */ 782e88d4ffSLorenzo Bianconi }; 792e88d4ffSLorenzo Bianconi 80106ca27fSJesper Dangaard Brouer struct xdp_buff { 81106ca27fSJesper Dangaard Brouer void *data; 82106ca27fSJesper Dangaard Brouer void *data_end; 83106ca27fSJesper Dangaard Brouer void *data_meta; 84106ca27fSJesper Dangaard Brouer void *data_hard_start; 85106ca27fSJesper Dangaard Brouer struct xdp_rxq_info *rxq; 8664b59025SDavid Ahern struct xdp_txq_info *txq; 87f95f0f95SJesper Dangaard Brouer u32 frame_sz; /* frame size to deduce data_hard_end/reserved tailroom*/ 882e88d4ffSLorenzo Bianconi u32 flags; /* supported values defined in xdp_buff_flags */ 89106ca27fSJesper Dangaard Brouer }; 905ab073ffSJesper Dangaard Brouer 912e88d4ffSLorenzo Bianconi static __always_inline bool xdp_buff_has_frags(struct xdp_buff *xdp) 922e88d4ffSLorenzo Bianconi { 932e88d4ffSLorenzo Bianconi return !!(xdp->flags & XDP_FLAGS_HAS_FRAGS); 942e88d4ffSLorenzo Bianconi } 952e88d4ffSLorenzo Bianconi 962e88d4ffSLorenzo Bianconi static __always_inline void xdp_buff_set_frags_flag(struct xdp_buff *xdp) 972e88d4ffSLorenzo Bianconi { 982e88d4ffSLorenzo Bianconi xdp->flags |= XDP_FLAGS_HAS_FRAGS; 992e88d4ffSLorenzo Bianconi } 1002e88d4ffSLorenzo Bianconi 1012e88d4ffSLorenzo Bianconi static __always_inline void xdp_buff_clear_frags_flag(struct xdp_buff *xdp) 1022e88d4ffSLorenzo Bianconi { 1032e88d4ffSLorenzo Bianconi xdp->flags &= ~XDP_FLAGS_HAS_FRAGS; 1042e88d4ffSLorenzo Bianconi } 1052e88d4ffSLorenzo Bianconi 106d65a1906SLorenzo Bianconi static __always_inline bool xdp_buff_is_frag_pfmemalloc(struct xdp_buff *xdp) 107d65a1906SLorenzo Bianconi { 108d65a1906SLorenzo Bianconi return !!(xdp->flags & XDP_FLAGS_FRAGS_PF_MEMALLOC); 109d65a1906SLorenzo Bianconi } 110d65a1906SLorenzo Bianconi 111d65a1906SLorenzo Bianconi static __always_inline void xdp_buff_set_frag_pfmemalloc(struct xdp_buff *xdp) 112d65a1906SLorenzo Bianconi { 113d65a1906SLorenzo Bianconi xdp->flags |= XDP_FLAGS_FRAGS_PF_MEMALLOC; 114d65a1906SLorenzo Bianconi } 115d65a1906SLorenzo Bianconi 11643b5169dSLorenzo Bianconi static __always_inline void 11743b5169dSLorenzo Bianconi xdp_init_buff(struct xdp_buff *xdp, u32 frame_sz, struct xdp_rxq_info *rxq) 11843b5169dSLorenzo Bianconi { 11943b5169dSLorenzo Bianconi xdp->frame_sz = frame_sz; 12043b5169dSLorenzo Bianconi xdp->rxq = rxq; 1212e88d4ffSLorenzo Bianconi xdp->flags = 0; 12243b5169dSLorenzo Bianconi } 12343b5169dSLorenzo Bianconi 124be9df4afSLorenzo Bianconi static __always_inline void 125be9df4afSLorenzo Bianconi xdp_prepare_buff(struct xdp_buff *xdp, unsigned char *hard_start, 126be9df4afSLorenzo Bianconi int headroom, int data_len, const bool meta_valid) 127be9df4afSLorenzo Bianconi { 128be9df4afSLorenzo Bianconi unsigned char *data = hard_start + headroom; 129be9df4afSLorenzo Bianconi 130be9df4afSLorenzo Bianconi xdp->data_hard_start = hard_start; 131be9df4afSLorenzo Bianconi xdp->data = data; 132be9df4afSLorenzo Bianconi xdp->data_end = data + data_len; 133be9df4afSLorenzo Bianconi xdp->data_meta = meta_valid ? data : data + 1; 134be9df4afSLorenzo Bianconi } 135be9df4afSLorenzo Bianconi 136f95f0f95SJesper Dangaard Brouer /* Reserve memory area at end-of data area. 137f95f0f95SJesper Dangaard Brouer * 138f95f0f95SJesper Dangaard Brouer * This macro reserves tailroom in the XDP buffer by limiting the 139f95f0f95SJesper Dangaard Brouer * XDP/BPF data access to data_hard_end. Notice same area (and size) 140f95f0f95SJesper Dangaard Brouer * is used for XDP_PASS, when constructing the SKB via build_skb(). 141f95f0f95SJesper Dangaard Brouer */ 142f95f0f95SJesper Dangaard Brouer #define xdp_data_hard_end(xdp) \ 143f95f0f95SJesper Dangaard Brouer ((xdp)->data_hard_start + (xdp)->frame_sz - \ 144f95f0f95SJesper Dangaard Brouer SKB_DATA_ALIGN(sizeof(struct skb_shared_info))) 145f95f0f95SJesper Dangaard Brouer 1462f0bc54bSLorenzo Bianconi static inline struct skb_shared_info * 1472f0bc54bSLorenzo Bianconi xdp_get_shared_info_from_buff(struct xdp_buff *xdp) 1482f0bc54bSLorenzo Bianconi { 1492f0bc54bSLorenzo Bianconi return (struct skb_shared_info *)xdp_data_hard_end(xdp); 1502f0bc54bSLorenzo Bianconi } 1512f0bc54bSLorenzo Bianconi 1520165cc81SLorenzo Bianconi static __always_inline unsigned int xdp_get_buff_len(struct xdp_buff *xdp) 1530165cc81SLorenzo Bianconi { 1540165cc81SLorenzo Bianconi unsigned int len = xdp->data_end - xdp->data; 1550165cc81SLorenzo Bianconi struct skb_shared_info *sinfo; 1560165cc81SLorenzo Bianconi 1570165cc81SLorenzo Bianconi if (likely(!xdp_buff_has_frags(xdp))) 1580165cc81SLorenzo Bianconi goto out; 1590165cc81SLorenzo Bianconi 1600165cc81SLorenzo Bianconi sinfo = xdp_get_shared_info_from_buff(xdp); 1610165cc81SLorenzo Bianconi len += sinfo->xdp_frags_size; 1620165cc81SLorenzo Bianconi out: 1630165cc81SLorenzo Bianconi return len; 1640165cc81SLorenzo Bianconi } 1650165cc81SLorenzo Bianconi 166c0048cffSJesper Dangaard Brouer struct xdp_frame { 167c0048cffSJesper Dangaard Brouer void *data; 168c0048cffSJesper Dangaard Brouer u16 len; 169c0048cffSJesper Dangaard Brouer u16 headroom; 170b860a1b9SJesper Dangaard Brouer u32 metasize; /* uses lower 8-bits */ 171c0048cffSJesper Dangaard Brouer /* Lifetime of xdp_rxq_info is limited to NAPI/enqueue time, 172c0048cffSJesper Dangaard Brouer * while mem info is valid on remote CPU. 173c0048cffSJesper Dangaard Brouer */ 174c0048cffSJesper Dangaard Brouer struct xdp_mem_info mem; 17570280ed9SJesper Dangaard Brouer struct net_device *dev_rx; /* used by cpumap */ 176b860a1b9SJesper Dangaard Brouer u32 frame_sz; 1772e88d4ffSLorenzo Bianconi u32 flags; /* supported values defined in xdp_buff_flags */ 178c0048cffSJesper Dangaard Brouer }; 179c0048cffSJesper Dangaard Brouer 1802e88d4ffSLorenzo Bianconi static __always_inline bool xdp_frame_has_frags(struct xdp_frame *frame) 1812e88d4ffSLorenzo Bianconi { 1822e88d4ffSLorenzo Bianconi return !!(frame->flags & XDP_FLAGS_HAS_FRAGS); 1832e88d4ffSLorenzo Bianconi } 1842e88d4ffSLorenzo Bianconi 185d65a1906SLorenzo Bianconi static __always_inline bool xdp_frame_is_frag_pfmemalloc(struct xdp_frame *frame) 186d65a1906SLorenzo Bianconi { 187d65a1906SLorenzo Bianconi return !!(frame->flags & XDP_FLAGS_FRAGS_PF_MEMALLOC); 188d65a1906SLorenzo Bianconi } 189d65a1906SLorenzo Bianconi 19089653987SLorenzo Bianconi #define XDP_BULK_QUEUE_SIZE 16 19189653987SLorenzo Bianconi struct xdp_frame_bulk { 19289653987SLorenzo Bianconi int count; 19389653987SLorenzo Bianconi void *xa; 19489653987SLorenzo Bianconi void *q[XDP_BULK_QUEUE_SIZE]; 19589653987SLorenzo Bianconi }; 19689653987SLorenzo Bianconi 19789653987SLorenzo Bianconi static __always_inline void xdp_frame_bulk_init(struct xdp_frame_bulk *bq) 19889653987SLorenzo Bianconi { 19989653987SLorenzo Bianconi /* bq->count will be zero'ed when bq->xa gets updated */ 20089653987SLorenzo Bianconi bq->xa = NULL; 20189653987SLorenzo Bianconi } 202dee72f8aSDavid S. Miller 2032f0bc54bSLorenzo Bianconi static inline struct skb_shared_info * 2042f0bc54bSLorenzo Bianconi xdp_get_shared_info_from_frame(struct xdp_frame *frame) 2052f0bc54bSLorenzo Bianconi { 2062f0bc54bSLorenzo Bianconi void *data_hard_start = frame->data - frame->headroom - sizeof(*frame); 2072f0bc54bSLorenzo Bianconi 2082f0bc54bSLorenzo Bianconi return (struct skb_shared_info *)(data_hard_start + frame->frame_sz - 2092f0bc54bSLorenzo Bianconi SKB_DATA_ALIGN(sizeof(struct skb_shared_info))); 2102f0bc54bSLorenzo Bianconi } 2112f0bc54bSLorenzo Bianconi 21292164774SLorenzo Bianconi struct xdp_cpumap_stats { 21328b1520eSLorenzo Bianconi unsigned int redirect; 21492164774SLorenzo Bianconi unsigned int pass; 21592164774SLorenzo Bianconi unsigned int drop; 21692164774SLorenzo Bianconi }; 21792164774SLorenzo Bianconi 218a8d5b4abSToshiaki Makita /* Clear kernel pointers in xdp_frame */ 219a8d5b4abSToshiaki Makita static inline void xdp_scrub_frame(struct xdp_frame *frame) 220a8d5b4abSToshiaki Makita { 221a8d5b4abSToshiaki Makita frame->data = NULL; 222a8d5b4abSToshiaki Makita frame->dev_rx = NULL; 223a8d5b4abSToshiaki Makita } 224a8d5b4abSToshiaki Makita 225d65a1906SLorenzo Bianconi static inline void 226d65a1906SLorenzo Bianconi xdp_update_skb_shared_info(struct sk_buff *skb, u8 nr_frags, 227d65a1906SLorenzo Bianconi unsigned int size, unsigned int truesize, 228d65a1906SLorenzo Bianconi bool pfmemalloc) 229d65a1906SLorenzo Bianconi { 230d65a1906SLorenzo Bianconi skb_shinfo(skb)->nr_frags = nr_frags; 231d65a1906SLorenzo Bianconi 232d65a1906SLorenzo Bianconi skb->len += size; 233d65a1906SLorenzo Bianconi skb->data_len += size; 234d65a1906SLorenzo Bianconi skb->truesize += truesize; 235d65a1906SLorenzo Bianconi skb->pfmemalloc |= pfmemalloc; 236d65a1906SLorenzo Bianconi } 237d65a1906SLorenzo Bianconi 23834cc0b33SJesper Dangaard Brouer /* Avoids inlining WARN macro in fast-path */ 23934cc0b33SJesper Dangaard Brouer void xdp_warn(const char *msg, const char *func, const int line); 24034cc0b33SJesper Dangaard Brouer #define XDP_WARN(msg) xdp_warn(msg, __func__, __LINE__) 24134cc0b33SJesper Dangaard Brouer 242b0d1beefSBjörn Töpel struct xdp_frame *xdp_convert_zc_to_xdp_frame(struct xdp_buff *xdp); 24397a0e1eaSLorenzo Bianconi struct sk_buff *__xdp_build_skb_from_frame(struct xdp_frame *xdpf, 24497a0e1eaSLorenzo Bianconi struct sk_buff *skb, 24597a0e1eaSLorenzo Bianconi struct net_device *dev); 24689f479f0SLorenzo Bianconi struct sk_buff *xdp_build_skb_from_frame(struct xdp_frame *xdpf, 24789f479f0SLorenzo Bianconi struct net_device *dev); 24865e6dcf7SLorenzo Bianconi int xdp_alloc_skb_bulk(void **skbs, int n_skb, gfp_t gfp); 249e624d4edSHangbin Liu struct xdp_frame *xdpf_clone(struct xdp_frame *xdpf); 250b0d1beefSBjörn Töpel 251fc379872SLorenzo Bianconi static inline 252fc379872SLorenzo Bianconi void xdp_convert_frame_to_buff(struct xdp_frame *frame, struct xdp_buff *xdp) 253fc379872SLorenzo Bianconi { 254fc379872SLorenzo Bianconi xdp->data_hard_start = frame->data - frame->headroom - sizeof(*frame); 255fc379872SLorenzo Bianconi xdp->data = frame->data; 256fc379872SLorenzo Bianconi xdp->data_end = frame->data + frame->len; 257fc379872SLorenzo Bianconi xdp->data_meta = frame->data - frame->metasize; 258fc379872SLorenzo Bianconi xdp->frame_sz = frame->frame_sz; 2592e88d4ffSLorenzo Bianconi xdp->flags = frame->flags; 260fc379872SLorenzo Bianconi } 261fc379872SLorenzo Bianconi 262c0048cffSJesper Dangaard Brouer static inline 263daa5cdc3SDavid Ahern int xdp_update_frame_from_buff(struct xdp_buff *xdp, 264daa5cdc3SDavid Ahern struct xdp_frame *xdp_frame) 265c0048cffSJesper Dangaard Brouer { 266daa5cdc3SDavid Ahern int metasize, headroom; 26702b55e56SBjörn Töpel 268c0048cffSJesper Dangaard Brouer /* Assure headroom is available for storing info */ 269c0048cffSJesper Dangaard Brouer headroom = xdp->data - xdp->data_hard_start; 270c0048cffSJesper Dangaard Brouer metasize = xdp->data - xdp->data_meta; 271c0048cffSJesper Dangaard Brouer metasize = metasize > 0 ? metasize : 0; 272c0048cffSJesper Dangaard Brouer if (unlikely((headroom - metasize) < sizeof(*xdp_frame))) 273daa5cdc3SDavid Ahern return -ENOSPC; 274c0048cffSJesper Dangaard Brouer 27534cc0b33SJesper Dangaard Brouer /* Catch if driver didn't reserve tailroom for skb_shared_info */ 27634cc0b33SJesper Dangaard Brouer if (unlikely(xdp->data_end > xdp_data_hard_end(xdp))) { 27734cc0b33SJesper Dangaard Brouer XDP_WARN("Driver BUG: missing reserved tailroom"); 278daa5cdc3SDavid Ahern return -ENOSPC; 27934cc0b33SJesper Dangaard Brouer } 28034cc0b33SJesper Dangaard Brouer 281c0048cffSJesper Dangaard Brouer xdp_frame->data = xdp->data; 282c0048cffSJesper Dangaard Brouer xdp_frame->len = xdp->data_end - xdp->data; 283c0048cffSJesper Dangaard Brouer xdp_frame->headroom = headroom - sizeof(*xdp_frame); 284c0048cffSJesper Dangaard Brouer xdp_frame->metasize = metasize; 28534cc0b33SJesper Dangaard Brouer xdp_frame->frame_sz = xdp->frame_sz; 2862e88d4ffSLorenzo Bianconi xdp_frame->flags = xdp->flags; 287c0048cffSJesper Dangaard Brouer 288daa5cdc3SDavid Ahern return 0; 289daa5cdc3SDavid Ahern } 290daa5cdc3SDavid Ahern 291daa5cdc3SDavid Ahern /* Convert xdp_buff to xdp_frame */ 292daa5cdc3SDavid Ahern static inline 293daa5cdc3SDavid Ahern struct xdp_frame *xdp_convert_buff_to_frame(struct xdp_buff *xdp) 294daa5cdc3SDavid Ahern { 295daa5cdc3SDavid Ahern struct xdp_frame *xdp_frame; 296daa5cdc3SDavid Ahern 297daa5cdc3SDavid Ahern if (xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL) 298daa5cdc3SDavid Ahern return xdp_convert_zc_to_xdp_frame(xdp); 299daa5cdc3SDavid Ahern 300daa5cdc3SDavid Ahern /* Store info in top of packet */ 301daa5cdc3SDavid Ahern xdp_frame = xdp->data_hard_start; 302daa5cdc3SDavid Ahern if (unlikely(xdp_update_frame_from_buff(xdp, xdp_frame) < 0)) 303daa5cdc3SDavid Ahern return NULL; 304daa5cdc3SDavid Ahern 305c0048cffSJesper Dangaard Brouer /* rxq only valid until napi_schedule ends, convert to xdp_mem_info */ 306c0048cffSJesper Dangaard Brouer xdp_frame->mem = xdp->rxq->mem; 307c0048cffSJesper Dangaard Brouer 308c0048cffSJesper Dangaard Brouer return xdp_frame; 309c0048cffSJesper Dangaard Brouer } 310c0048cffSJesper Dangaard Brouer 311bf25146aSEelco Chaudron void __xdp_return(void *data, struct xdp_mem_info *mem, bool napi_direct, 312bf25146aSEelco Chaudron struct xdp_buff *xdp); 31303993094SJesper Dangaard Brouer void xdp_return_frame(struct xdp_frame *xdpf); 314389ab7f0SJesper Dangaard Brouer void xdp_return_frame_rx_napi(struct xdp_frame *xdpf); 315c497176cSBjörn Töpel void xdp_return_buff(struct xdp_buff *xdp); 31689653987SLorenzo Bianconi void xdp_flush_frame_bulk(struct xdp_frame_bulk *bq); 31789653987SLorenzo Bianconi void xdp_return_frame_bulk(struct xdp_frame *xdpf, 31889653987SLorenzo Bianconi struct xdp_frame_bulk *bq); 3195ab073ffSJesper Dangaard Brouer 3206bf071bfSJesper Dangaard Brouer /* When sending xdp_frame into the network stack, then there is no 3216bf071bfSJesper Dangaard Brouer * return point callback, which is needed to release e.g. DMA-mapping 3226bf071bfSJesper Dangaard Brouer * resources with page_pool. Thus, have explicit function to release 3236bf071bfSJesper Dangaard Brouer * frame resources. 3246bf071bfSJesper Dangaard Brouer */ 3256bf071bfSJesper Dangaard Brouer void __xdp_release_frame(void *data, struct xdp_mem_info *mem); 3266bf071bfSJesper Dangaard Brouer static inline void xdp_release_frame(struct xdp_frame *xdpf) 3276bf071bfSJesper Dangaard Brouer { 3286bf071bfSJesper Dangaard Brouer struct xdp_mem_info *mem = &xdpf->mem; 3297c48cb01SLorenzo Bianconi struct skb_shared_info *sinfo; 3307c48cb01SLorenzo Bianconi int i; 3316bf071bfSJesper Dangaard Brouer 3326bf071bfSJesper Dangaard Brouer /* Curr only page_pool needs this */ 3337c48cb01SLorenzo Bianconi if (mem->type != MEM_TYPE_PAGE_POOL) 3347c48cb01SLorenzo Bianconi return; 3357c48cb01SLorenzo Bianconi 3367c48cb01SLorenzo Bianconi if (likely(!xdp_frame_has_frags(xdpf))) 3377c48cb01SLorenzo Bianconi goto out; 3387c48cb01SLorenzo Bianconi 3397c48cb01SLorenzo Bianconi sinfo = xdp_get_shared_info_from_frame(xdpf); 3407c48cb01SLorenzo Bianconi for (i = 0; i < sinfo->nr_frags; i++) { 3417c48cb01SLorenzo Bianconi struct page *page = skb_frag_page(&sinfo->frags[i]); 3427c48cb01SLorenzo Bianconi 3437c48cb01SLorenzo Bianconi __xdp_release_frame(page_address(page), mem); 3447c48cb01SLorenzo Bianconi } 3457c48cb01SLorenzo Bianconi out: 3466bf071bfSJesper Dangaard Brouer __xdp_release_frame(xdpf->data, mem); 3476bf071bfSJesper Dangaard Brouer } 3486bf071bfSJesper Dangaard Brouer 3495142239aSLorenzo Bianconi static __always_inline unsigned int xdp_get_frame_len(struct xdp_frame *xdpf) 3505142239aSLorenzo Bianconi { 3515142239aSLorenzo Bianconi struct skb_shared_info *sinfo; 3525142239aSLorenzo Bianconi unsigned int len = xdpf->len; 3535142239aSLorenzo Bianconi 3545142239aSLorenzo Bianconi if (likely(!xdp_frame_has_frags(xdpf))) 3555142239aSLorenzo Bianconi goto out; 3565142239aSLorenzo Bianconi 3575142239aSLorenzo Bianconi sinfo = xdp_get_shared_info_from_frame(xdpf); 3585142239aSLorenzo Bianconi len += sinfo->xdp_frags_size; 3595142239aSLorenzo Bianconi out: 3605142239aSLorenzo Bianconi return len; 3615142239aSLorenzo Bianconi } 3625142239aSLorenzo Bianconi 363bf25146aSEelco Chaudron int __xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq, 364bf25146aSEelco Chaudron struct net_device *dev, u32 queue_index, 365bf25146aSEelco Chaudron unsigned int napi_id, u32 frag_size); 366bf25146aSEelco Chaudron static inline int 367bf25146aSEelco Chaudron xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq, 368bf25146aSEelco Chaudron struct net_device *dev, u32 queue_index, 369bf25146aSEelco Chaudron unsigned int napi_id) 370bf25146aSEelco Chaudron { 371bf25146aSEelco Chaudron return __xdp_rxq_info_reg(xdp_rxq, dev, queue_index, napi_id, 0); 372bf25146aSEelco Chaudron } 373bf25146aSEelco Chaudron 374aecd67b6SJesper Dangaard Brouer void xdp_rxq_info_unreg(struct xdp_rxq_info *xdp_rxq); 375aecd67b6SJesper Dangaard Brouer void xdp_rxq_info_unused(struct xdp_rxq_info *xdp_rxq); 376c0124f32SJesper Dangaard Brouer bool xdp_rxq_info_is_reg(struct xdp_rxq_info *xdp_rxq); 3775ab073ffSJesper Dangaard Brouer int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq, 3785ab073ffSJesper Dangaard Brouer enum xdp_mem_type type, void *allocator); 379dce5bd61SBjörn Töpel void xdp_rxq_info_unreg_mem_model(struct xdp_rxq_info *xdp_rxq); 3804a48ef70SToke Høiland-Jørgensen int xdp_reg_mem_model(struct xdp_mem_info *mem, 3814a48ef70SToke Høiland-Jørgensen enum xdp_mem_type type, void *allocator); 3824a48ef70SToke Høiland-Jørgensen void xdp_unreg_mem_model(struct xdp_mem_info *mem); 383aecd67b6SJesper Dangaard Brouer 384106ca27fSJesper Dangaard Brouer /* Drivers not supporting XDP metadata can use this helper, which 385106ca27fSJesper Dangaard Brouer * rejects any room expansion for metadata as a result. 386106ca27fSJesper Dangaard Brouer */ 387106ca27fSJesper Dangaard Brouer static __always_inline void 388106ca27fSJesper Dangaard Brouer xdp_set_data_meta_invalid(struct xdp_buff *xdp) 389106ca27fSJesper Dangaard Brouer { 390106ca27fSJesper Dangaard Brouer xdp->data_meta = xdp->data + 1; 391106ca27fSJesper Dangaard Brouer } 392106ca27fSJesper Dangaard Brouer 393106ca27fSJesper Dangaard Brouer static __always_inline bool 394106ca27fSJesper Dangaard Brouer xdp_data_meta_unsupported(const struct xdp_buff *xdp) 395106ca27fSJesper Dangaard Brouer { 396106ca27fSJesper Dangaard Brouer return unlikely(xdp->data_meta > xdp->data); 397106ca27fSJesper Dangaard Brouer } 398106ca27fSJesper Dangaard Brouer 3997445cf31SZvi Effron static inline bool xdp_metalen_invalid(unsigned long metalen) 4007445cf31SZvi Effron { 4017445cf31SZvi Effron return (metalen & (sizeof(__u32) - 1)) || (metalen > 32); 4027445cf31SZvi Effron } 4037445cf31SZvi Effron 40405296620SJakub Kicinski struct xdp_attachment_info { 40505296620SJakub Kicinski struct bpf_prog *prog; 40605296620SJakub Kicinski u32 flags; 40705296620SJakub Kicinski }; 40805296620SJakub Kicinski 40905296620SJakub Kicinski struct netdev_bpf; 41005296620SJakub Kicinski void xdp_attachment_setup(struct xdp_attachment_info *info, 41105296620SJakub Kicinski struct netdev_bpf *bpf); 41205296620SJakub Kicinski 41389653987SLorenzo Bianconi #define DEV_MAP_BULK_SIZE XDP_BULK_QUEUE_SIZE 414788f87acSIoana Ciornei 4153d76a4d3SStanislav Fomichev #define XDP_METADATA_KFUNC_xxx \ 4163d76a4d3SStanislav Fomichev XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_TIMESTAMP, \ 4173d76a4d3SStanislav Fomichev bpf_xdp_metadata_rx_timestamp) \ 4183d76a4d3SStanislav Fomichev XDP_METADATA_KFUNC(XDP_METADATA_KFUNC_RX_HASH, \ 4193d76a4d3SStanislav Fomichev bpf_xdp_metadata_rx_hash) \ 4203d76a4d3SStanislav Fomichev 4213d76a4d3SStanislav Fomichev enum { 4223d76a4d3SStanislav Fomichev #define XDP_METADATA_KFUNC(name, _) name, 4233d76a4d3SStanislav Fomichev XDP_METADATA_KFUNC_xxx 4243d76a4d3SStanislav Fomichev #undef XDP_METADATA_KFUNC 4253d76a4d3SStanislav Fomichev MAX_XDP_METADATA_KFUNC, 4263d76a4d3SStanislav Fomichev }; 4273d76a4d3SStanislav Fomichev 4283d76a4d3SStanislav Fomichev #ifdef CONFIG_NET 4293d76a4d3SStanislav Fomichev u32 bpf_xdp_metadata_kfunc_id(int id); 4303d76a4d3SStanislav Fomichev bool bpf_dev_bound_kfunc_id(u32 btf_id); 431*f85949f9SLorenzo Bianconi void xdp_set_features_flag(struct net_device *dev, xdp_features_t val); 43266c0e13aSMarek Majtyka void xdp_features_set_redirect_target(struct net_device *dev, bool support_sg); 43366c0e13aSMarek Majtyka void xdp_features_clear_redirect_target(struct net_device *dev); 4343d76a4d3SStanislav Fomichev #else 4353d76a4d3SStanislav Fomichev static inline u32 bpf_xdp_metadata_kfunc_id(int id) { return 0; } 4363d76a4d3SStanislav Fomichev static inline bool bpf_dev_bound_kfunc_id(u32 btf_id) { return false; } 43766c0e13aSMarek Majtyka 43866c0e13aSMarek Majtyka static inline void 439*f85949f9SLorenzo Bianconi xdp_set_features_flag(struct net_device *dev, xdp_features_t val) 440*f85949f9SLorenzo Bianconi { 441*f85949f9SLorenzo Bianconi } 442*f85949f9SLorenzo Bianconi 443*f85949f9SLorenzo Bianconi static inline void 44466c0e13aSMarek Majtyka xdp_features_set_redirect_target(struct net_device *dev, bool support_sg) 44566c0e13aSMarek Majtyka { 44666c0e13aSMarek Majtyka } 44766c0e13aSMarek Majtyka 44866c0e13aSMarek Majtyka static inline void 44966c0e13aSMarek Majtyka xdp_features_clear_redirect_target(struct net_device *dev) 45066c0e13aSMarek Majtyka { 45166c0e13aSMarek Majtyka } 4523d76a4d3SStanislav Fomichev #endif 4533d76a4d3SStanislav Fomichev 454*f85949f9SLorenzo Bianconi static inline void xdp_clear_features_flag(struct net_device *dev) 455*f85949f9SLorenzo Bianconi { 456*f85949f9SLorenzo Bianconi xdp_set_features_flag(dev, 0); 457*f85949f9SLorenzo Bianconi } 458*f85949f9SLorenzo Bianconi 459aecd67b6SJesper Dangaard Brouer #endif /* __LINUX_NET_XDP_H__ */ 460