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xsk: Introduce AF_XDP buffer allocation API
In order to simplify AF_XDP zero-copy enablement for NIC driver
developers, a new AF_XDP buffer allocation API is added. The
implementation is based on a single core (single producer/consumer)
buffer pool for the AF_XDP UMEM.
A buffer is allocated using the xsk_buff_alloc() function, and
returned using xsk_buff_free(). If a buffer is disassociated with the
pool, e.g. when a buffer is passed to an AF_XDP socket, a buffer is
said to be released. Currently, the release function is only used by
the AF_XDP internals and not visible to the driver.
Drivers using this API should register the XDP memory model with the
new MEM_TYPE_XSK_BUFF_POOL type.
The API is defined in net/xdp_sock_drv.h.
The buffer type is struct xdp_buff, and follows the lifetime of
regular xdp_buffs, i.e. the lifetime of an xdp_buff is restricted to
a NAPI context. In other words, the API is not replacing xdp_frames.
In addition to introducing the API and implementations, the AF_XDP
core is migrated to use the new APIs.
rfc->v1: Fixed build errors/warnings for m68k and riscv. (kbuild test
robot)
Added headroom/chunk size getter. (Maxim/Björn)
v1->v2: Swapped SoBs. (Maxim)
v2->v3: Initialize struct xdp_buff member frame_sz. (Björn)
Add API to query the DMA address of a frame. (Maxim)
Do DMA sync for CPU till the end of the frame to handle
possible growth (frame_sz). (Maxim)
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Maxim Mikityanskiy <maximmi@mellanox.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200520192103.355233-6-bjorn.topel@gmail.com
This commit is contained in:
Björn Töpel
Alexei Starovoitov
parent
89e4a376e3
commit
2b43470add
@ -40,6 +40,7 @@ enum xdp_mem_type {
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MEM_TYPE_PAGE_ORDER0, /* Orig XDP full page model */
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MEM_TYPE_PAGE_POOL,
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MEM_TYPE_ZERO_COPY,
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MEM_TYPE_XSK_BUFF_POOL,
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MEM_TYPE_MAX,
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};
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@ -119,7 +120,8 @@ struct xdp_frame *convert_to_xdp_frame(struct xdp_buff *xdp)
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int metasize;
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int headroom;
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if (xdp->rxq->mem.type == MEM_TYPE_ZERO_COPY)
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if (xdp->rxq->mem.type == MEM_TYPE_ZERO_COPY ||
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xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL)
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return xdp_convert_zc_to_xdp_frame(xdp);
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/* Assure headroom is available for storing info */
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@ -31,11 +31,13 @@ struct xdp_umem_fq_reuse {
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struct xdp_umem {
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struct xsk_queue *fq;
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struct xsk_queue *cq;
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struct xsk_buff_pool *pool;
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struct xdp_umem_page *pages;
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u64 chunk_mask;
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u64 size;
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u32 headroom;
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u32 chunk_size_nohr;
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u32 chunk_size;
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struct user_struct *user;
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refcount_t users;
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struct work_struct work;
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@ -7,6 +7,7 @@
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#define _LINUX_XDP_SOCK_DRV_H
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#include <net/xdp_sock.h>
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#include <net/xsk_buff_pool.h>
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#ifdef CONFIG_XDP_SOCKETS
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@ -101,6 +102,94 @@ static inline u32 xsk_umem_xdp_frame_sz(struct xdp_umem *umem)
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return umem->chunk_size_nohr;
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}
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static inline u32 xsk_umem_get_headroom(struct xdp_umem *umem)
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{
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return XDP_PACKET_HEADROOM + umem->headroom;
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}
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static inline u32 xsk_umem_get_chunk_size(struct xdp_umem *umem)
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{
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return umem->chunk_size;
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}
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static inline u32 xsk_umem_get_rx_frame_size(struct xdp_umem *umem)
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{
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return xsk_umem_get_chunk_size(umem) - xsk_umem_get_headroom(umem);
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}
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static inline void xsk_buff_set_rxq_info(struct xdp_umem *umem,
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struct xdp_rxq_info *rxq)
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{
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xp_set_rxq_info(umem->pool, rxq);
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}
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static inline void xsk_buff_dma_unmap(struct xdp_umem *umem,
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unsigned long attrs)
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{
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xp_dma_unmap(umem->pool, attrs);
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}
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static inline int xsk_buff_dma_map(struct xdp_umem *umem, struct device *dev,
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unsigned long attrs)
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{
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return xp_dma_map(umem->pool, dev, attrs, umem->pgs, umem->npgs);
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}
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static inline dma_addr_t xsk_buff_xdp_get_dma(struct xdp_buff *xdp)
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{
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struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
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return xp_get_dma(xskb);
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}
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static inline dma_addr_t xsk_buff_xdp_get_frame_dma(struct xdp_buff *xdp)
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{
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struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
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return xp_get_frame_dma(xskb);
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}
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static inline struct xdp_buff *xsk_buff_alloc(struct xdp_umem *umem)
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{
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return xp_alloc(umem->pool);
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}
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static inline bool xsk_buff_can_alloc(struct xdp_umem *umem, u32 count)
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{
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return xp_can_alloc(umem->pool, count);
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}
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static inline void xsk_buff_free(struct xdp_buff *xdp)
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{
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struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
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xp_free(xskb);
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}
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static inline dma_addr_t xsk_buff_raw_get_dma(struct xdp_umem *umem, u64 addr)
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{
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return xp_raw_get_dma(umem->pool, addr);
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}
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static inline void *xsk_buff_raw_get_data(struct xdp_umem *umem, u64 addr)
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{
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return xp_raw_get_data(umem->pool, addr);
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}
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static inline void xsk_buff_dma_sync_for_cpu(struct xdp_buff *xdp)
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{
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struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
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xp_dma_sync_for_cpu(xskb);
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}
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static inline void xsk_buff_raw_dma_sync_for_device(struct xdp_umem *umem,
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dma_addr_t dma,
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size_t size)
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{
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xp_dma_sync_for_device(umem->pool, dma, size);
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}
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#else
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static inline bool xsk_umem_has_addrs(struct xdp_umem *umem, u32 cnt)
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@ -212,6 +301,81 @@ static inline u32 xsk_umem_xdp_frame_sz(struct xdp_umem *umem)
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return 0;
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}
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static inline u32 xsk_umem_get_headroom(struct xdp_umem *umem)
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{
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return 0;
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}
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static inline u32 xsk_umem_get_chunk_size(struct xdp_umem *umem)
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{
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return 0;
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}
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static inline u32 xsk_umem_get_rx_frame_size(struct xdp_umem *umem)
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{
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return 0;
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}
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static inline void xsk_buff_set_rxq_info(struct xdp_umem *umem,
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struct xdp_rxq_info *rxq)
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{
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}
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static inline void xsk_buff_dma_unmap(struct xdp_umem *umem,
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unsigned long attrs)
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{
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}
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static inline int xsk_buff_dma_map(struct xdp_umem *umem, struct device *dev,
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unsigned long attrs)
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{
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return 0;
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}
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static inline dma_addr_t xsk_buff_xdp_get_dma(struct xdp_buff *xdp)
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{
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return 0;
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}
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static inline dma_addr_t xsk_buff_xdp_get_frame_dma(struct xdp_buff *xdp)
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{
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return 0;
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}
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static inline struct xdp_buff *xsk_buff_alloc(struct xdp_umem *umem)
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{
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return NULL;
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}
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static inline bool xsk_buff_can_alloc(struct xdp_umem *umem, u32 count)
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{
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return false;
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}
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static inline void xsk_buff_free(struct xdp_buff *xdp)
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{
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}
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static inline dma_addr_t xsk_buff_raw_get_dma(struct xdp_umem *umem, u64 addr)
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{
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return 0;
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}
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static inline void *xsk_buff_raw_get_data(struct xdp_umem *umem, u64 addr)
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{
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return NULL;
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}
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static inline void xsk_buff_dma_sync_for_cpu(struct xdp_buff *xdp)
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{
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}
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static inline void xsk_buff_raw_dma_sync_for_device(struct xdp_umem *umem,
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dma_addr_t dma,
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size_t size)
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{
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}
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#endif /* CONFIG_XDP_SOCKETS */
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#endif /* _LINUX_XDP_SOCK_DRV_H */
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56
include/net/xsk_buff_pool.h
Normal file
56
include/net/xsk_buff_pool.h
Normal file
@ -0,0 +1,56 @@
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/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright(c) 2020 Intel Corporation. */
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#ifndef XSK_BUFF_POOL_H_
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#define XSK_BUFF_POOL_H_
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#include <linux/types.h>
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#include <linux/dma-mapping.h>
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#include <net/xdp.h>
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struct xsk_buff_pool;
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struct xdp_rxq_info;
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struct xsk_queue;
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struct xdp_desc;
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struct device;
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struct page;
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struct xdp_buff_xsk {
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struct xdp_buff xdp;
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dma_addr_t dma;
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dma_addr_t frame_dma;
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struct xsk_buff_pool *pool;
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bool unaligned;
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u64 orig_addr;
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struct list_head free_list_node;
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};
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/* AF_XDP core. */
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struct xsk_buff_pool *xp_create(struct page **pages, u32 nr_pages, u32 chunks,
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u32 chunk_size, u32 headroom, u64 size,
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bool unaligned);
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void xp_set_fq(struct xsk_buff_pool *pool, struct xsk_queue *fq);
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void xp_destroy(struct xsk_buff_pool *pool);
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void xp_release(struct xdp_buff_xsk *xskb);
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u64 xp_get_handle(struct xdp_buff_xsk *xskb);
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bool xp_validate_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc);
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/* AF_XDP, and XDP core. */
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void xp_free(struct xdp_buff_xsk *xskb);
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/* AF_XDP ZC drivers, via xdp_sock_buff.h */
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void xp_set_rxq_info(struct xsk_buff_pool *pool, struct xdp_rxq_info *rxq);
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int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev,
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unsigned long attrs, struct page **pages, u32 nr_pages);
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void xp_dma_unmap(struct xsk_buff_pool *pool, unsigned long attrs);
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struct xdp_buff *xp_alloc(struct xsk_buff_pool *pool);
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bool xp_can_alloc(struct xsk_buff_pool *pool, u32 count);
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void *xp_raw_get_data(struct xsk_buff_pool *pool, u64 addr);
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dma_addr_t xp_raw_get_dma(struct xsk_buff_pool *pool, u64 addr);
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dma_addr_t xp_get_dma(struct xdp_buff_xsk *xskb);
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dma_addr_t xp_get_frame_dma(struct xdp_buff_xsk *xskb);
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void xp_dma_sync_for_cpu(struct xdp_buff_xsk *xskb);
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void xp_dma_sync_for_device(struct xsk_buff_pool *pool, dma_addr_t dma,
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size_t size);
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#endif /* XSK_BUFF_POOL_H_ */
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@ -287,7 +287,8 @@ TRACE_EVENT(xdp_devmap_xmit,
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FN(PAGE_SHARED) \
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FN(PAGE_ORDER0) \
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FN(PAGE_POOL) \
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FN(ZERO_COPY)
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FN(ZERO_COPY) \
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FN(XSK_BUFF_POOL)
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#define __MEM_TYPE_TP_FN(x) \
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TRACE_DEFINE_ENUM(MEM_TYPE_##x);
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@ -17,6 +17,7 @@
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#include <net/xdp.h>
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#include <net/xdp_priv.h> /* struct xdp_mem_allocator */
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#include <trace/events/xdp.h>
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#include <net/xdp_sock_drv.h>
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#define REG_STATE_NEW 0x0
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#define REG_STATE_REGISTERED 0x1
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@ -361,7 +362,7 @@ EXPORT_SYMBOL_GPL(xdp_rxq_info_reg_mem_model);
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* of xdp_frames/pages in those cases.
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*/
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static void __xdp_return(void *data, struct xdp_mem_info *mem, bool napi_direct,
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unsigned long handle)
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unsigned long handle, struct xdp_buff *xdp)
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{
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struct xdp_mem_allocator *xa;
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struct page *page;
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@ -390,6 +391,11 @@ static void __xdp_return(void *data, struct xdp_mem_info *mem, bool napi_direct,
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xa = rhashtable_lookup(mem_id_ht, &mem->id, mem_id_rht_params);
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xa->zc_alloc->free(xa->zc_alloc, handle);
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rcu_read_unlock();
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break;
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case MEM_TYPE_XSK_BUFF_POOL:
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/* NB! Only valid from an xdp_buff! */
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xsk_buff_free(xdp);
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break;
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default:
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/* Not possible, checked in xdp_rxq_info_reg_mem_model() */
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break;
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@ -398,19 +404,19 @@ static void __xdp_return(void *data, struct xdp_mem_info *mem, bool napi_direct,
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void xdp_return_frame(struct xdp_frame *xdpf)
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{
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__xdp_return(xdpf->data, &xdpf->mem, false, 0);
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__xdp_return(xdpf->data, &xdpf->mem, false, 0, NULL);
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}
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EXPORT_SYMBOL_GPL(xdp_return_frame);
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void xdp_return_frame_rx_napi(struct xdp_frame *xdpf)
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{
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__xdp_return(xdpf->data, &xdpf->mem, true, 0);
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__xdp_return(xdpf->data, &xdpf->mem, true, 0, NULL);
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}
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EXPORT_SYMBOL_GPL(xdp_return_frame_rx_napi);
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void xdp_return_buff(struct xdp_buff *xdp)
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{
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__xdp_return(xdp->data, &xdp->rxq->mem, true, xdp->handle);
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__xdp_return(xdp->data, &xdp->rxq->mem, true, xdp->handle, xdp);
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}
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EXPORT_SYMBOL_GPL(xdp_return_buff);
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@ -1,3 +1,4 @@
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# SPDX-License-Identifier: GPL-2.0-only
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obj-$(CONFIG_XDP_SOCKETS) += xsk.o xdp_umem.o xsk_queue.o xskmap.o
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obj-$(CONFIG_XDP_SOCKETS) += xsk_buff_pool.o
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obj-$(CONFIG_XDP_SOCKETS_DIAG) += xsk_diag.o
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@ -245,7 +245,7 @@ static void xdp_umem_release(struct xdp_umem *umem)
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}
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xsk_reuseq_destroy(umem);
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xp_destroy(umem->pool);
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xdp_umem_unmap_pages(umem);
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xdp_umem_unpin_pages(umem);
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@ -390,6 +390,7 @@ static int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr)
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umem->size = size;
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umem->headroom = headroom;
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umem->chunk_size_nohr = chunk_size - headroom;
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umem->chunk_size = chunk_size;
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umem->npgs = size / PAGE_SIZE;
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umem->pgs = NULL;
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umem->user = NULL;
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@ -415,11 +416,21 @@ static int xdp_umem_reg(struct xdp_umem *umem, struct xdp_umem_reg *mr)
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}
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err = xdp_umem_map_pages(umem);
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if (!err)
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return 0;
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if (err)
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goto out_pages;
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umem->pool = xp_create(umem->pgs, umem->npgs, chunks, chunk_size,
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headroom, size, unaligned_chunks);
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if (!umem->pool) {
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err = -ENOMEM;
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goto out_unmap;
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}
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return 0;
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out_unmap:
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xdp_umem_unmap_pages(umem);
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out_pages:
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kvfree(umem->pages);
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out_pin:
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xdp_umem_unpin_pages(umem);
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out_account:
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149
net/xdp/xsk.c
149
net/xdp/xsk.c
@ -117,76 +117,67 @@ bool xsk_umem_uses_need_wakeup(struct xdp_umem *umem)
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}
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EXPORT_SYMBOL(xsk_umem_uses_need_wakeup);
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/* If a buffer crosses a page boundary, we need to do 2 memcpy's, one for
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* each page. This is only required in copy mode.
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*/
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static void __xsk_rcv_memcpy(struct xdp_umem *umem, u64 addr, void *from_buf,
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u32 len, u32 metalen)
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static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len)
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{
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void *to_buf = xdp_umem_get_data(umem, addr);
|
||||
struct xdp_buff_xsk *xskb = container_of(xdp, struct xdp_buff_xsk, xdp);
|
||||
u64 addr;
|
||||
int err;
|
||||
|
||||
addr = xsk_umem_add_offset_to_addr(addr);
|
||||
if (xskq_cons_crosses_non_contig_pg(umem, addr, len + metalen)) {
|
||||
void *next_pg_addr = umem->pages[(addr >> PAGE_SHIFT) + 1].addr;
|
||||
u64 page_start = addr & ~(PAGE_SIZE - 1);
|
||||
u64 first_len = PAGE_SIZE - (addr - page_start);
|
||||
addr = xp_get_handle(xskb);
|
||||
err = xskq_prod_reserve_desc(xs->rx, addr, len);
|
||||
if (err) {
|
||||
xs->rx_dropped++;
|
||||
return err;
|
||||
}
|
||||
|
||||
memcpy(to_buf, from_buf, first_len);
|
||||
memcpy(next_pg_addr, from_buf + first_len,
|
||||
len + metalen - first_len);
|
||||
xp_release(xskb);
|
||||
return 0;
|
||||
}
|
||||
|
||||
return;
|
||||
static void xsk_copy_xdp(struct xdp_buff *to, struct xdp_buff *from, u32 len)
|
||||
{
|
||||
void *from_buf, *to_buf;
|
||||
u32 metalen;
|
||||
|
||||
if (unlikely(xdp_data_meta_unsupported(from))) {
|
||||
from_buf = from->data;
|
||||
to_buf = to->data;
|
||||
metalen = 0;
|
||||
} else {
|
||||
from_buf = from->data_meta;
|
||||
metalen = from->data - from->data_meta;
|
||||
to_buf = to->data - metalen;
|
||||
}
|
||||
|
||||
memcpy(to_buf, from_buf, len + metalen);
|
||||
}
|
||||
|
||||
static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len)
|
||||
static int __xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len,
|
||||
bool explicit_free)
|
||||
{
|
||||
u64 offset = xs->umem->headroom;
|
||||
u64 addr, memcpy_addr;
|
||||
void *from_buf;
|
||||
u32 metalen;
|
||||
struct xdp_buff *xsk_xdp;
|
||||
int err;
|
||||
|
||||
if (!xskq_cons_peek_addr(xs->umem->fq, &addr, xs->umem) ||
|
||||
len > xs->umem->chunk_size_nohr - XDP_PACKET_HEADROOM) {
|
||||
if (len > xsk_umem_get_rx_frame_size(xs->umem)) {
|
||||
xs->rx_dropped++;
|
||||
return -ENOSPC;
|
||||
}
|
||||
|
||||
if (unlikely(xdp_data_meta_unsupported(xdp))) {
|
||||
from_buf = xdp->data;
|
||||
metalen = 0;
|
||||
} else {
|
||||
from_buf = xdp->data_meta;
|
||||
metalen = xdp->data - xdp->data_meta;
|
||||
}
|
||||
|
||||
memcpy_addr = xsk_umem_adjust_offset(xs->umem, addr, offset);
|
||||
__xsk_rcv_memcpy(xs->umem, memcpy_addr, from_buf, len, metalen);
|
||||
|
||||
offset += metalen;
|
||||
addr = xsk_umem_adjust_offset(xs->umem, addr, offset);
|
||||
err = xskq_prod_reserve_desc(xs->rx, addr, len);
|
||||
if (!err) {
|
||||
xskq_cons_release(xs->umem->fq);
|
||||
xdp_return_buff(xdp);
|
||||
return 0;
|
||||
}
|
||||
|
||||
xs->rx_dropped++;
|
||||
return err;
|
||||
}
|
||||
|
||||
static int __xsk_rcv_zc(struct xdp_sock *xs, struct xdp_buff *xdp, u32 len)
|
||||
{
|
||||
int err = xskq_prod_reserve_desc(xs->rx, xdp->handle, len);
|
||||
|
||||
if (err)
|
||||
xsk_xdp = xsk_buff_alloc(xs->umem);
|
||||
if (!xsk_xdp) {
|
||||
xs->rx_dropped++;
|
||||
return -ENOSPC;
|
||||
}
|
||||
|
||||
return err;
|
||||
xsk_copy_xdp(xsk_xdp, xdp, len);
|
||||
err = __xsk_rcv_zc(xs, xsk_xdp, len);
|
||||
if (err) {
|
||||
xsk_buff_free(xsk_xdp);
|
||||
return err;
|
||||
}
|
||||
if (explicit_free)
|
||||
xdp_return_buff(xdp);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static bool xsk_is_bound(struct xdp_sock *xs)
|
||||
@ -199,7 +190,8 @@ static bool xsk_is_bound(struct xdp_sock *xs)
|
||||
return false;
|
||||
}
|
||||
|
||||
static int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
|
||||
static int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp,
|
||||
bool explicit_free)
|
||||
{
|
||||
u32 len;
|
||||
|
||||
@ -211,8 +203,10 @@ static int xsk_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
|
||||
|
||||
len = xdp->data_end - xdp->data;
|
||||
|
||||
return (xdp->rxq->mem.type == MEM_TYPE_ZERO_COPY) ?
|
||||
__xsk_rcv_zc(xs, xdp, len) : __xsk_rcv(xs, xdp, len);
|
||||
return xdp->rxq->mem.type == MEM_TYPE_ZERO_COPY ||
|
||||
xdp->rxq->mem.type == MEM_TYPE_XSK_BUFF_POOL ?
|
||||
__xsk_rcv_zc(xs, xdp, len) :
|
||||
__xsk_rcv(xs, xdp, len, explicit_free);
|
||||
}
|
||||
|
||||
static void xsk_flush(struct xdp_sock *xs)
|
||||
@ -224,46 +218,11 @@ static void xsk_flush(struct xdp_sock *xs)
|
||||
|
||||
int xsk_generic_rcv(struct xdp_sock *xs, struct xdp_buff *xdp)
|
||||
{
|
||||
u32 metalen = xdp->data - xdp->data_meta;
|
||||
u32 len = xdp->data_end - xdp->data;
|
||||
u64 offset = xs->umem->headroom;
|
||||
void *buffer;
|
||||
u64 addr;
|
||||
int err;
|
||||
|
||||
spin_lock_bh(&xs->rx_lock);
|
||||
|
||||
if (xs->dev != xdp->rxq->dev || xs->queue_id != xdp->rxq->queue_index) {
|
||||
err = -EINVAL;
|
||||
goto out_unlock;
|
||||
}
|
||||
|
||||
if (!xskq_cons_peek_addr(xs->umem->fq, &addr, xs->umem) ||
|
||||
len > xs->umem->chunk_size_nohr - XDP_PACKET_HEADROOM) {
|
||||
err = -ENOSPC;
|
||||
goto out_drop;
|
||||
}
|
||||
|
||||
addr = xsk_umem_adjust_offset(xs->umem, addr, offset);
|
||||
buffer = xdp_umem_get_data(xs->umem, addr);
|
||||
memcpy(buffer, xdp->data_meta, len + metalen);
|
||||
|
||||
addr = xsk_umem_adjust_offset(xs->umem, addr, metalen);
|
||||
err = xskq_prod_reserve_desc(xs->rx, addr, len);
|
||||
if (err)
|
||||
goto out_drop;
|
||||
|
||||
xskq_cons_release(xs->umem->fq);
|
||||
xskq_prod_submit(xs->rx);
|
||||
|
||||
spin_unlock_bh(&xs->rx_lock);
|
||||
|
||||
xs->sk.sk_data_ready(&xs->sk);
|
||||
return 0;
|
||||
|
||||
out_drop:
|
||||
xs->rx_dropped++;
|
||||
out_unlock:
|
||||
err = xsk_rcv(xs, xdp, false);
|
||||
xsk_flush(xs);
|
||||
spin_unlock_bh(&xs->rx_lock);
|
||||
return err;
|
||||
}
|
||||
@ -273,7 +232,7 @@ int __xsk_map_redirect(struct xdp_sock *xs, struct xdp_buff *xdp)
|
||||
struct list_head *flush_list = this_cpu_ptr(&xskmap_flush_list);
|
||||
int err;
|
||||
|
||||
err = xsk_rcv(xs, xdp);
|
||||
err = xsk_rcv(xs, xdp, true);
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
@ -404,7 +363,7 @@ static int xsk_generic_xmit(struct sock *sk)
|
||||
|
||||
skb_put(skb, len);
|
||||
addr = desc.addr;
|
||||
buffer = xdp_umem_get_data(xs->umem, addr);
|
||||
buffer = xsk_buff_raw_get_data(xs->umem, addr);
|
||||
err = skb_store_bits(skb, 0, buffer, len);
|
||||
/* This is the backpressure mechanism for the Tx path.
|
||||
* Reserve space in the completion queue and only proceed
|
||||
@ -860,6 +819,8 @@ static int xsk_setsockopt(struct socket *sock, int level, int optname,
|
||||
q = (optname == XDP_UMEM_FILL_RING) ? &xs->umem->fq :
|
||||
&xs->umem->cq;
|
||||
err = xsk_init_queue(entries, q, true);
|
||||
if (optname == XDP_UMEM_FILL_RING)
|
||||
xp_set_fq(xs->umem->pool, *q);
|
||||
mutex_unlock(&xs->mutex);
|
||||
return err;
|
||||
}
|
||||
|
||||
467
net/xdp/xsk_buff_pool.c
Normal file
467
net/xdp/xsk_buff_pool.c
Normal file
@ -0,0 +1,467 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
|
||||
#include <net/xsk_buff_pool.h>
|
||||
#include <net/xdp_sock.h>
|
||||
#include <linux/dma-direct.h>
|
||||
#include <linux/dma-noncoherent.h>
|
||||
#include <linux/swiotlb.h>
|
||||
|
||||
#include "xsk_queue.h"
|
||||
|
||||
struct xsk_buff_pool {
|
||||
struct xsk_queue *fq;
|
||||
struct list_head free_list;
|
||||
dma_addr_t *dma_pages;
|
||||
struct xdp_buff_xsk *heads;
|
||||
u64 chunk_mask;
|
||||
u64 addrs_cnt;
|
||||
u32 free_list_cnt;
|
||||
u32 dma_pages_cnt;
|
||||
u32 heads_cnt;
|
||||
u32 free_heads_cnt;
|
||||
u32 headroom;
|
||||
u32 chunk_size;
|
||||
u32 frame_len;
|
||||
bool cheap_dma;
|
||||
bool unaligned;
|
||||
void *addrs;
|
||||
struct device *dev;
|
||||
struct xdp_buff_xsk *free_heads[];
|
||||
};
|
||||
|
||||
static void xp_addr_unmap(struct xsk_buff_pool *pool)
|
||||
{
|
||||
vunmap(pool->addrs);
|
||||
}
|
||||
|
||||
static int xp_addr_map(struct xsk_buff_pool *pool,
|
||||
struct page **pages, u32 nr_pages)
|
||||
{
|
||||
pool->addrs = vmap(pages, nr_pages, VM_MAP, PAGE_KERNEL);
|
||||
if (!pool->addrs)
|
||||
return -ENOMEM;
|
||||
return 0;
|
||||
}
|
||||
|
||||
void xp_destroy(struct xsk_buff_pool *pool)
|
||||
{
|
||||
if (!pool)
|
||||
return;
|
||||
|
||||
xp_addr_unmap(pool);
|
||||
kvfree(pool->heads);
|
||||
kvfree(pool);
|
||||
}
|
||||
|
||||
struct xsk_buff_pool *xp_create(struct page **pages, u32 nr_pages, u32 chunks,
|
||||
u32 chunk_size, u32 headroom, u64 size,
|
||||
bool unaligned)
|
||||
{
|
||||
struct xsk_buff_pool *pool;
|
||||
struct xdp_buff_xsk *xskb;
|
||||
int err;
|
||||
u32 i;
|
||||
|
||||
pool = kvzalloc(struct_size(pool, free_heads, chunks), GFP_KERNEL);
|
||||
if (!pool)
|
||||
goto out;
|
||||
|
||||
pool->heads = kvcalloc(chunks, sizeof(*pool->heads), GFP_KERNEL);
|
||||
if (!pool->heads)
|
||||
goto out;
|
||||
|
||||
pool->chunk_mask = ~((u64)chunk_size - 1);
|
||||
pool->addrs_cnt = size;
|
||||
pool->heads_cnt = chunks;
|
||||
pool->free_heads_cnt = chunks;
|
||||
pool->headroom = headroom;
|
||||
pool->chunk_size = chunk_size;
|
||||
pool->cheap_dma = true;
|
||||
pool->unaligned = unaligned;
|
||||
pool->frame_len = chunk_size - headroom - XDP_PACKET_HEADROOM;
|
||||
INIT_LIST_HEAD(&pool->free_list);
|
||||
|
||||
for (i = 0; i < pool->free_heads_cnt; i++) {
|
||||
xskb = &pool->heads[i];
|
||||
xskb->pool = pool;
|
||||
xskb->xdp.frame_sz = chunk_size - headroom;
|
||||
pool->free_heads[i] = xskb;
|
||||
}
|
||||
|
||||
err = xp_addr_map(pool, pages, nr_pages);
|
||||
if (!err)
|
||||
return pool;
|
||||
|
||||
out:
|
||||
xp_destroy(pool);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
void xp_set_fq(struct xsk_buff_pool *pool, struct xsk_queue *fq)
|
||||
{
|
||||
pool->fq = fq;
|
||||
}
|
||||
|
||||
void xp_set_rxq_info(struct xsk_buff_pool *pool, struct xdp_rxq_info *rxq)
|
||||
{
|
||||
u32 i;
|
||||
|
||||
for (i = 0; i < pool->heads_cnt; i++)
|
||||
pool->heads[i].xdp.rxq = rxq;
|
||||
}
|
||||
EXPORT_SYMBOL(xp_set_rxq_info);
|
||||
|
||||
void xp_dma_unmap(struct xsk_buff_pool *pool, unsigned long attrs)
|
||||
{
|
||||
dma_addr_t *dma;
|
||||
u32 i;
|
||||
|
||||
if (pool->dma_pages_cnt == 0)
|
||||
return;
|
||||
|
||||
for (i = 0; i < pool->dma_pages_cnt; i++) {
|
||||
dma = &pool->dma_pages[i];
|
||||
if (*dma) {
|
||||
dma_unmap_page_attrs(pool->dev, *dma, PAGE_SIZE,
|
||||
DMA_BIDIRECTIONAL, attrs);
|
||||
*dma = 0;
|
||||
}
|
||||
}
|
||||
|
||||
kvfree(pool->dma_pages);
|
||||
pool->dma_pages_cnt = 0;
|
||||
pool->dev = NULL;
|
||||
}
|
||||
EXPORT_SYMBOL(xp_dma_unmap);
|
||||
|
||||
static void xp_check_dma_contiguity(struct xsk_buff_pool *pool)
|
||||
{
|
||||
u32 i;
|
||||
|
||||
for (i = 0; i < pool->dma_pages_cnt - 1; i++) {
|
||||
if (pool->dma_pages[i] + PAGE_SIZE == pool->dma_pages[i + 1])
|
||||
pool->dma_pages[i] |= XSK_NEXT_PG_CONTIG_MASK;
|
||||
else
|
||||
pool->dma_pages[i] &= ~XSK_NEXT_PG_CONTIG_MASK;
|
||||
}
|
||||
}
|
||||
|
||||
static bool __maybe_unused xp_check_swiotlb_dma(struct xsk_buff_pool *pool)
|
||||
{
|
||||
#if defined(CONFIG_SWIOTLB)
|
||||
phys_addr_t paddr;
|
||||
u32 i;
|
||||
|
||||
for (i = 0; i < pool->dma_pages_cnt; i++) {
|
||||
paddr = dma_to_phys(pool->dev, pool->dma_pages[i]);
|
||||
if (is_swiotlb_buffer(paddr))
|
||||
return false;
|
||||
}
|
||||
#endif
|
||||
return true;
|
||||
}
|
||||
|
||||
static bool xp_check_cheap_dma(struct xsk_buff_pool *pool)
|
||||
{
|
||||
#if defined(CONFIG_HAS_DMA)
|
||||
const struct dma_map_ops *ops = get_dma_ops(pool->dev);
|
||||
|
||||
if (ops) {
|
||||
return !ops->sync_single_for_cpu &&
|
||||
!ops->sync_single_for_device;
|
||||
}
|
||||
|
||||
if (!dma_is_direct(ops))
|
||||
return false;
|
||||
|
||||
if (!xp_check_swiotlb_dma(pool))
|
||||
return false;
|
||||
|
||||
if (!dev_is_dma_coherent(pool->dev)) {
|
||||
#if defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU) || \
|
||||
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_CPU_ALL) || \
|
||||
defined(CONFIG_ARCH_HAS_SYNC_DMA_FOR_DEVICE)
|
||||
return false;
|
||||
#endif
|
||||
}
|
||||
#endif
|
||||
return true;
|
||||
}
|
||||
|
||||
int xp_dma_map(struct xsk_buff_pool *pool, struct device *dev,
|
||||
unsigned long attrs, struct page **pages, u32 nr_pages)
|
||||
{
|
||||
dma_addr_t dma;
|
||||
u32 i;
|
||||
|
||||
pool->dma_pages = kvcalloc(nr_pages, sizeof(*pool->dma_pages),
|
||||
GFP_KERNEL);
|
||||
if (!pool->dma_pages)
|
||||
return -ENOMEM;
|
||||
|
||||
pool->dev = dev;
|
||||
pool->dma_pages_cnt = nr_pages;
|
||||
|
||||
for (i = 0; i < pool->dma_pages_cnt; i++) {
|
||||
dma = dma_map_page_attrs(dev, pages[i], 0, PAGE_SIZE,
|
||||
DMA_BIDIRECTIONAL, attrs);
|
||||
if (dma_mapping_error(dev, dma)) {
|
||||
xp_dma_unmap(pool, attrs);
|
||||
return -ENOMEM;
|
||||
}
|
||||
pool->dma_pages[i] = dma;
|
||||
}
|
||||
|
||||
if (pool->unaligned)
|
||||
xp_check_dma_contiguity(pool);
|
||||
|
||||
pool->dev = dev;
|
||||
pool->cheap_dma = xp_check_cheap_dma(pool);
|
||||
return 0;
|
||||
}
|
||||
EXPORT_SYMBOL(xp_dma_map);
|
||||
|
||||
static bool xp_desc_crosses_non_contig_pg(struct xsk_buff_pool *pool,
|
||||
u64 addr, u32 len)
|
||||
{
|
||||
bool cross_pg = (addr & (PAGE_SIZE - 1)) + len > PAGE_SIZE;
|
||||
|
||||
if (pool->dma_pages_cnt && cross_pg) {
|
||||
return !(pool->dma_pages[addr >> PAGE_SHIFT] &
|
||||
XSK_NEXT_PG_CONTIG_MASK);
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
static bool xp_addr_crosses_non_contig_pg(struct xsk_buff_pool *pool,
|
||||
u64 addr)
|
||||
{
|
||||
return xp_desc_crosses_non_contig_pg(pool, addr, pool->chunk_size);
|
||||
}
|
||||
|
||||
void xp_release(struct xdp_buff_xsk *xskb)
|
||||
{
|
||||
xskb->pool->free_heads[xskb->pool->free_heads_cnt++] = xskb;
|
||||
}
|
||||
|
||||
static u64 xp_aligned_extract_addr(struct xsk_buff_pool *pool, u64 addr)
|
||||
{
|
||||
return addr & pool->chunk_mask;
|
||||
}
|
||||
|
||||
static u64 xp_unaligned_extract_addr(u64 addr)
|
||||
{
|
||||
return addr & XSK_UNALIGNED_BUF_ADDR_MASK;
|
||||
}
|
||||
|
||||
static u64 xp_unaligned_extract_offset(u64 addr)
|
||||
{
|
||||
return addr >> XSK_UNALIGNED_BUF_OFFSET_SHIFT;
|
||||
}
|
||||
|
||||
static u64 xp_unaligned_add_offset_to_addr(u64 addr)
|
||||
{
|
||||
return xp_unaligned_extract_addr(addr) +
|
||||
xp_unaligned_extract_offset(addr);
|
||||
}
|
||||
|
||||
static bool xp_check_unaligned(struct xsk_buff_pool *pool, u64 *addr)
|
||||
{
|
||||
*addr = xp_unaligned_extract_addr(*addr);
|
||||
if (*addr >= pool->addrs_cnt ||
|
||||
*addr + pool->chunk_size > pool->addrs_cnt ||
|
||||
xp_addr_crosses_non_contig_pg(pool, *addr))
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
|
||||
static bool xp_check_aligned(struct xsk_buff_pool *pool, u64 *addr)
|
||||
{
|
||||
*addr = xp_aligned_extract_addr(pool, *addr);
|
||||
return *addr < pool->addrs_cnt;
|
||||
}
|
||||
|
||||
static struct xdp_buff_xsk *__xp_alloc(struct xsk_buff_pool *pool)
|
||||
{
|
||||
struct xdp_buff_xsk *xskb;
|
||||
u64 addr;
|
||||
bool ok;
|
||||
|
||||
if (pool->free_heads_cnt == 0)
|
||||
return NULL;
|
||||
|
||||
xskb = pool->free_heads[--pool->free_heads_cnt];
|
||||
|
||||
for (;;) {
|
||||
if (!xskq_cons_peek_addr_unchecked(pool->fq, &addr)) {
|
||||
xp_release(xskb);
|
||||
return NULL;
|
||||
}
|
||||
|
||||
ok = pool->unaligned ? xp_check_unaligned(pool, &addr) :
|
||||
xp_check_aligned(pool, &addr);
|
||||
if (!ok) {
|
||||
pool->fq->invalid_descs++;
|
||||
xskq_cons_release(pool->fq);
|
||||
continue;
|
||||
}
|
||||
break;
|
||||
}
|
||||
xskq_cons_release(pool->fq);
|
||||
|
||||
xskb->orig_addr = addr;
|
||||
xskb->xdp.data_hard_start = pool->addrs + addr + pool->headroom;
|
||||
if (pool->dma_pages_cnt) {
|
||||
xskb->frame_dma = (pool->dma_pages[addr >> PAGE_SHIFT] &
|
||||
~XSK_NEXT_PG_CONTIG_MASK) +
|
||||
(addr & ~PAGE_MASK);
|
||||
xskb->dma = xskb->frame_dma + pool->headroom +
|
||||
XDP_PACKET_HEADROOM;
|
||||
}
|
||||
return xskb;
|
||||
}
|
||||
|
||||
struct xdp_buff *xp_alloc(struct xsk_buff_pool *pool)
|
||||
{
|
||||
struct xdp_buff_xsk *xskb;
|
||||
|
||||
if (!pool->free_list_cnt) {
|
||||
xskb = __xp_alloc(pool);
|
||||
if (!xskb)
|
||||
return NULL;
|
||||
} else {
|
||||
pool->free_list_cnt--;
|
||||
xskb = list_first_entry(&pool->free_list, struct xdp_buff_xsk,
|
||||
free_list_node);
|
||||
list_del(&xskb->free_list_node);
|
||||
}
|
||||
|
||||
xskb->xdp.data = xskb->xdp.data_hard_start + XDP_PACKET_HEADROOM;
|
||||
xskb->xdp.data_meta = xskb->xdp.data;
|
||||
|
||||
if (!pool->cheap_dma) {
|
||||
dma_sync_single_range_for_device(pool->dev, xskb->dma, 0,
|
||||
pool->frame_len,
|
||||
DMA_BIDIRECTIONAL);
|
||||
}
|
||||
return &xskb->xdp;
|
||||
}
|
||||
EXPORT_SYMBOL(xp_alloc);
|
||||
|
||||
bool xp_can_alloc(struct xsk_buff_pool *pool, u32 count)
|
||||
{
|
||||
if (pool->free_list_cnt >= count)
|
||||
return true;
|
||||
return xskq_cons_has_entries(pool->fq, count - pool->free_list_cnt);
|
||||
}
|
||||
EXPORT_SYMBOL(xp_can_alloc);
|
||||
|
||||
void xp_free(struct xdp_buff_xsk *xskb)
|
||||
{
|
||||
xskb->pool->free_list_cnt++;
|
||||
list_add(&xskb->free_list_node, &xskb->pool->free_list);
|
||||
}
|
||||
EXPORT_SYMBOL(xp_free);
|
||||
|
||||
static bool xp_aligned_validate_desc(struct xsk_buff_pool *pool,
|
||||
struct xdp_desc *desc)
|
||||
{
|
||||
u64 chunk, chunk_end;
|
||||
|
||||
chunk = xp_aligned_extract_addr(pool, desc->addr);
|
||||
chunk_end = xp_aligned_extract_addr(pool, desc->addr + desc->len);
|
||||
if (chunk != chunk_end)
|
||||
return false;
|
||||
|
||||
if (chunk >= pool->addrs_cnt)
|
||||
return false;
|
||||
|
||||
if (desc->options)
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
|
||||
static bool xp_unaligned_validate_desc(struct xsk_buff_pool *pool,
|
||||
struct xdp_desc *desc)
|
||||
{
|
||||
u64 addr, base_addr;
|
||||
|
||||
base_addr = xp_unaligned_extract_addr(desc->addr);
|
||||
addr = xp_unaligned_add_offset_to_addr(desc->addr);
|
||||
|
||||
if (desc->len > pool->chunk_size)
|
||||
return false;
|
||||
|
||||
if (base_addr >= pool->addrs_cnt || addr >= pool->addrs_cnt ||
|
||||
xp_desc_crosses_non_contig_pg(pool, addr, desc->len))
|
||||
return false;
|
||||
|
||||
if (desc->options)
|
||||
return false;
|
||||
return true;
|
||||
}
|
||||
|
||||
bool xp_validate_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc)
|
||||
{
|
||||
return pool->unaligned ? xp_unaligned_validate_desc(pool, desc) :
|
||||
xp_aligned_validate_desc(pool, desc);
|
||||
}
|
||||
|
||||
u64 xp_get_handle(struct xdp_buff_xsk *xskb)
|
||||
{
|
||||
u64 offset = xskb->xdp.data - xskb->xdp.data_hard_start;
|
||||
|
||||
offset += xskb->pool->headroom;
|
||||
if (!xskb->pool->unaligned)
|
||||
return xskb->orig_addr + offset;
|
||||
return xskb->orig_addr + (offset << XSK_UNALIGNED_BUF_OFFSET_SHIFT);
|
||||
}
|
||||
|
||||
void *xp_raw_get_data(struct xsk_buff_pool *pool, u64 addr)
|
||||
{
|
||||
addr = pool->unaligned ? xp_unaligned_add_offset_to_addr(addr) : addr;
|
||||
return pool->addrs + addr;
|
||||
}
|
||||
EXPORT_SYMBOL(xp_raw_get_data);
|
||||
|
||||
dma_addr_t xp_raw_get_dma(struct xsk_buff_pool *pool, u64 addr)
|
||||
{
|
||||
addr = pool->unaligned ? xp_unaligned_add_offset_to_addr(addr) : addr;
|
||||
return (pool->dma_pages[addr >> PAGE_SHIFT] &
|
||||
~XSK_NEXT_PG_CONTIG_MASK) +
|
||||
(addr & ~PAGE_MASK);
|
||||
}
|
||||
EXPORT_SYMBOL(xp_raw_get_dma);
|
||||
|
||||
dma_addr_t xp_get_dma(struct xdp_buff_xsk *xskb)
|
||||
{
|
||||
return xskb->dma;
|
||||
}
|
||||
EXPORT_SYMBOL(xp_get_dma);
|
||||
|
||||
dma_addr_t xp_get_frame_dma(struct xdp_buff_xsk *xskb)
|
||||
{
|
||||
return xskb->frame_dma;
|
||||
}
|
||||
EXPORT_SYMBOL(xp_get_frame_dma);
|
||||
|
||||
void xp_dma_sync_for_cpu(struct xdp_buff_xsk *xskb)
|
||||
{
|
||||
if (xskb->pool->cheap_dma)
|
||||
return;
|
||||
|
||||
dma_sync_single_range_for_cpu(xskb->pool->dev, xskb->dma, 0,
|
||||
xskb->pool->frame_len, DMA_BIDIRECTIONAL);
|
||||
}
|
||||
EXPORT_SYMBOL(xp_dma_sync_for_cpu);
|
||||
|
||||
void xp_dma_sync_for_device(struct xsk_buff_pool *pool, dma_addr_t dma,
|
||||
size_t size)
|
||||
{
|
||||
if (pool->cheap_dma)
|
||||
return;
|
||||
|
||||
dma_sync_single_range_for_device(pool->dev, dma, 0,
|
||||
size, DMA_BIDIRECTIONAL);
|
||||
}
|
||||
EXPORT_SYMBOL(xp_dma_sync_for_device);
|
||||
@ -56,7 +56,7 @@ static int xsk_diag_put_umem(const struct xdp_sock *xs, struct sk_buff *nlskb)
|
||||
du.id = umem->id;
|
||||
du.size = umem->size;
|
||||
du.num_pages = umem->npgs;
|
||||
du.chunk_size = umem->chunk_size_nohr + umem->headroom;
|
||||
du.chunk_size = umem->chunk_size;
|
||||
du.headroom = umem->headroom;
|
||||
du.ifindex = umem->dev ? umem->dev->ifindex : 0;
|
||||
du.queue_id = umem->queue_id;
|
||||
|
||||
@ -9,6 +9,7 @@
|
||||
#include <linux/types.h>
|
||||
#include <linux/if_xdp.h>
|
||||
#include <net/xdp_sock.h>
|
||||
#include <net/xsk_buff_pool.h>
|
||||
|
||||
#include "xsk.h"
|
||||
|
||||
@ -172,31 +173,45 @@ out:
|
||||
return false;
|
||||
}
|
||||
|
||||
static inline bool xskq_cons_read_addr_aligned(struct xsk_queue *q, u64 *addr)
|
||||
{
|
||||
struct xdp_umem_ring *ring = (struct xdp_umem_ring *)q->ring;
|
||||
|
||||
while (q->cached_cons != q->cached_prod) {
|
||||
u32 idx = q->cached_cons & q->ring_mask;
|
||||
|
||||
*addr = ring->desc[idx];
|
||||
if (xskq_cons_is_valid_addr(q, *addr))
|
||||
return true;
|
||||
|
||||
q->cached_cons++;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
static inline bool xskq_cons_read_addr_unchecked(struct xsk_queue *q, u64 *addr)
|
||||
{
|
||||
struct xdp_umem_ring *ring = (struct xdp_umem_ring *)q->ring;
|
||||
|
||||
if (q->cached_cons != q->cached_prod) {
|
||||
u32 idx = q->cached_cons & q->ring_mask;
|
||||
|
||||
*addr = ring->desc[idx];
|
||||
return true;
|
||||
}
|
||||
|
||||
return false;
|
||||
}
|
||||
|
||||
static inline bool xskq_cons_is_valid_desc(struct xsk_queue *q,
|
||||
struct xdp_desc *d,
|
||||
struct xdp_umem *umem)
|
||||
{
|
||||
if (umem->flags & XDP_UMEM_UNALIGNED_CHUNK_FLAG) {
|
||||
if (!xskq_cons_is_valid_unaligned(q, d->addr, d->len, umem))
|
||||
return false;
|
||||
|
||||
if (d->len > umem->chunk_size_nohr || d->options) {
|
||||
q->invalid_descs++;
|
||||
return false;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
if (!xskq_cons_is_valid_addr(q, d->addr))
|
||||
return false;
|
||||
|
||||
if (((d->addr + d->len) & q->chunk_mask) != (d->addr & q->chunk_mask) ||
|
||||
d->options) {
|
||||
if (!xp_validate_desc(umem->pool, d)) {
|
||||
q->invalid_descs++;
|
||||
return false;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
@ -260,6 +275,20 @@ static inline bool xskq_cons_peek_addr(struct xsk_queue *q, u64 *addr,
|
||||
return xskq_cons_read_addr(q, addr, umem);
|
||||
}
|
||||
|
||||
static inline bool xskq_cons_peek_addr_aligned(struct xsk_queue *q, u64 *addr)
|
||||
{
|
||||
if (q->cached_prod == q->cached_cons)
|
||||
xskq_cons_get_entries(q);
|
||||
return xskq_cons_read_addr_aligned(q, addr);
|
||||
}
|
||||
|
||||
static inline bool xskq_cons_peek_addr_unchecked(struct xsk_queue *q, u64 *addr)
|
||||
{
|
||||
if (q->cached_prod == q->cached_cons)
|
||||
xskq_cons_get_entries(q);
|
||||
return xskq_cons_read_addr_unchecked(q, addr);
|
||||
}
|
||||
|
||||
static inline bool xskq_cons_peek_desc(struct xsk_queue *q,
|
||||
struct xdp_desc *desc,
|
||||
struct xdp_umem *umem)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user