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5ab073ffd3
Introduce an xdp_return_frame API, and convert over cpumap as the first user, given it have queued XDP frame structure to leverage. V3: Cleanup and remove C99 style comments, pointed out by Alex Duyck. V6: Remove comment that id will be added later (Req by Alex Duyck) V8: Rename enum mem_type to xdp_mem_type (found by kbuild test robot) Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
/* include/net/xdp.h
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*
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* Copyright (c) 2017 Jesper Dangaard Brouer, Red Hat Inc.
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* Released under terms in GPL version 2. See COPYING.
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*/
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#ifndef __LINUX_NET_XDP_H__
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#define __LINUX_NET_XDP_H__
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/**
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* DOC: XDP RX-queue information
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*
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* The XDP RX-queue info (xdp_rxq_info) is associated with the driver
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* level RX-ring queues. It is information that is specific to how
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* the driver have configured a given RX-ring queue.
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*
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* Each xdp_buff frame received in the driver carry a (pointer)
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* reference to this xdp_rxq_info structure. This provides the XDP
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* data-path read-access to RX-info for both kernel and bpf-side
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* (limited subset).
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*
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* For now, direct access is only safe while running in NAPI/softirq
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* context. Contents is read-mostly and must not be updated during
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* driver NAPI/softirq poll.
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*
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* The driver usage API is a register and unregister API.
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*
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* The struct is not directly tied to the XDP prog. A new XDP prog
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* can be attached as long as it doesn't change the underlying
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* RX-ring. If the RX-ring does change significantly, the NIC driver
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* naturally need to stop the RX-ring before purging and reallocating
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* memory. In that process the driver MUST call unregistor (which
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* also apply for driver shutdown and unload). The register API is
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* also mandatory during RX-ring setup.
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*/
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enum xdp_mem_type {
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MEM_TYPE_PAGE_SHARED = 0, /* Split-page refcnt based model */
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MEM_TYPE_PAGE_ORDER0, /* Orig XDP full page model */
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MEM_TYPE_MAX,
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};
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struct xdp_mem_info {
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u32 type; /* enum xdp_mem_type, but known size type */
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};
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struct xdp_rxq_info {
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struct net_device *dev;
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u32 queue_index;
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u32 reg_state;
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struct xdp_mem_info mem;
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} ____cacheline_aligned; /* perf critical, avoid false-sharing */
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static inline
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void xdp_return_frame(void *data, struct xdp_mem_info *mem)
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{
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if (mem->type == MEM_TYPE_PAGE_SHARED)
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page_frag_free(data);
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if (mem->type == MEM_TYPE_PAGE_ORDER0) {
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struct page *page = virt_to_page(data); /* Assumes order0 page*/
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put_page(page);
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}
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}
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int xdp_rxq_info_reg(struct xdp_rxq_info *xdp_rxq,
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struct net_device *dev, u32 queue_index);
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void xdp_rxq_info_unreg(struct xdp_rxq_info *xdp_rxq);
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void xdp_rxq_info_unused(struct xdp_rxq_info *xdp_rxq);
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bool xdp_rxq_info_is_reg(struct xdp_rxq_info *xdp_rxq);
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int xdp_rxq_info_reg_mem_model(struct xdp_rxq_info *xdp_rxq,
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enum xdp_mem_type type, void *allocator);
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#endif /* __LINUX_NET_XDP_H__ */
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