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2324c78a75
DMA engine will always write no more than dma_buf_sz bytes of a received frame into a page buffer, the remaining spaces are unused or used by CPU exclusively. Setting page_pool_params.max_len to almost the full size of page(s) helps nothing more, but wastes more CPU cycles on cache maintenance. For a standard MTU of 1500, then dma_buf_sz is assigned to 1536, and this patch brings ~16.9% driver performance improvement in a TCP RX throughput test with iPerf tool on a single isolated Cortex-A65 CPU core, from 2.43 Gbits/sec increased to 2.84 Gbits/sec. Signed-off-by: Furong Xu <0x1207@gmail.com> Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com> Reviewed-by: Yanteng Si <si.yanteng@linux.dev> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
14 lines
445 B
C
14 lines
445 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (c) 2021, Intel Corporation. */
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#ifndef _STMMAC_XDP_H_
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#define _STMMAC_XDP_H_
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#define STMMAC_RX_DMA_ATTR (DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_WEAK_ORDERING)
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int stmmac_xdp_setup_pool(struct stmmac_priv *priv, struct xsk_buff_pool *pool,
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u16 queue);
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int stmmac_xdp_set_prog(struct stmmac_priv *priv, struct bpf_prog *prog,
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struct netlink_ext_ack *extack);
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#endif /* _STMMAC_XDP_H_ */
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