mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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5fa4caff59
Now that the IAVF driver simply uses dev_alloc_page() + free_page() with no custom recycling logics, it can easily be switched to using Page Pool / libeth API instead. This allows to removing the whole dancing around headroom, HW buffer size, and page order. All DMA-for-device is now done in the PP core, for-CPU -- in the libeth helper. Use skb_mark_for_recycle() to bring back the recycling and restore the performance. Speaking of performance: on par with the baseline and faster with the PP optimization series applied. But the memory usage for 1500b MTU is now almost 2x lower (x86_64) thanks to allocating a page every second descriptor. Signed-off-by: Alexander Lobakin <aleksander.lobakin@intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
51 lines
1.4 KiB
C
51 lines
1.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/* Copyright (C) 2024 Intel Corporation */
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#ifndef __LIBIE_RX_H
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#define __LIBIE_RX_H
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#include <net/libeth/rx.h>
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/* Rx buffer management */
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/* The largest size for a single descriptor as per HW */
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#define LIBIE_MAX_RX_BUF_LEN 9728U
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/* "True" HW-writeable space: minimum from SW and HW values */
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#define LIBIE_RX_BUF_LEN(hr) min_t(u32, LIBETH_RX_PAGE_LEN(hr), \
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LIBIE_MAX_RX_BUF_LEN)
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/* The maximum frame size as per HW (S/G) */
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#define __LIBIE_MAX_RX_FRM_LEN 16382U
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/* ATST, HW can chain up to 5 Rx descriptors */
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#define LIBIE_MAX_RX_FRM_LEN(hr) \
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min_t(u32, __LIBIE_MAX_RX_FRM_LEN, LIBIE_RX_BUF_LEN(hr) * 5)
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/* Maximum frame size minus LL overhead */
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#define LIBIE_MAX_MTU \
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(LIBIE_MAX_RX_FRM_LEN(LIBETH_MAX_HEADROOM) - LIBETH_RX_LL_LEN)
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/* O(1) converting i40e/ice/iavf's 8/10-bit hardware packet type to a parsed
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* bitfield struct.
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*/
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#define LIBIE_RX_PT_NUM 154
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extern const struct libeth_rx_pt libie_rx_pt_lut[LIBIE_RX_PT_NUM];
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/**
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* libie_rx_pt_parse - convert HW packet type to software bitfield structure
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* @pt: 10-bit hardware packet type value from the descriptor
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*
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* ```libie_rx_pt_lut``` must be accessed only using this wrapper.
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*
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* Return: parsed bitfield struct corresponding to the provided ptype.
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*/
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static inline struct libeth_rx_pt libie_rx_pt_parse(u32 pt)
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{
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if (unlikely(pt >= LIBIE_RX_PT_NUM))
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pt = 0;
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return libie_rx_pt_lut[pt];
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}
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#endif /* __LIBIE_RX_H */
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