From 5fa4caff59f251bf9f766fc48c9f0a774a9216a0 Mon Sep 17 00:00:00 2001 From: Alexander Lobakin Date: Thu, 18 Apr 2024 13:36:15 +0200 Subject: iavf: switch to Page Pool 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 Signed-off-by: Tony Nguyen --- include/linux/net/intel/libie/rx.h | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'include/linux/net') diff --git a/include/linux/net/intel/libie/rx.h b/include/linux/net/intel/libie/rx.h index 37c5c8f26fb9..8e97775f1d66 100644 --- a/include/linux/net/intel/libie/rx.h +++ b/include/linux/net/intel/libie/rx.h @@ -6,6 +6,23 @@ #include +/* Rx buffer management */ + +/* The largest size for a single descriptor as per HW */ +#define LIBIE_MAX_RX_BUF_LEN 9728U +/* "True" HW-writeable space: minimum from SW and HW values */ +#define LIBIE_RX_BUF_LEN(hr) min_t(u32, LIBETH_RX_PAGE_LEN(hr), \ + LIBIE_MAX_RX_BUF_LEN) + +/* The maximum frame size as per HW (S/G) */ +#define __LIBIE_MAX_RX_FRM_LEN 16382U +/* ATST, HW can chain up to 5 Rx descriptors */ +#define LIBIE_MAX_RX_FRM_LEN(hr) \ + min_t(u32, __LIBIE_MAX_RX_FRM_LEN, LIBIE_RX_BUF_LEN(hr) * 5) +/* Maximum frame size minus LL overhead */ +#define LIBIE_MAX_MTU \ + (LIBIE_MAX_RX_FRM_LEN(LIBETH_MAX_HEADROOM) - LIBETH_RX_LL_LEN) + /* O(1) converting i40e/ice/iavf's 8/10-bit hardware packet type to a parsed * bitfield struct. */ -- cgit v1.2.3