From 27544c0ecb4ca50954a109475932e681ea77cd6d Mon Sep 17 00:00:00 2001 From: Vikas Gupta Date: Tue, 1 Jul 2025 14:35:03 +0000 Subject: [PATCH] bng_en: Add ring memory allocation support Add ring allocation/free mechanism which help to allocate rings (TX/RX/Completion) and backing stores memory on the host for the device. Future patches will use these functions. Signed-off-by: Vikas Gupta Reviewed-by: Bhargava Chenna Marreddy Reviewed-by: Rajashekar Hudumula Link: https://patch.msgid.link/20250701143511.280702-6-vikas.gupta@broadcom.com Signed-off-by: Jakub Kicinski --- drivers/net/ethernet/broadcom/bnge/Makefile | 3 +- .../net/ethernet/broadcom/bnge/bnge_rmem.c | 101 ++++++++++++++++++ .../net/ethernet/broadcom/bnge/bnge_rmem.h | 35 ++++++ 3 files changed, 138 insertions(+), 1 deletion(-) create mode 100644 drivers/net/ethernet/broadcom/bnge/bnge_rmem.c create mode 100644 drivers/net/ethernet/broadcom/bnge/bnge_rmem.h diff --git a/drivers/net/ethernet/broadcom/bnge/Makefile b/drivers/net/ethernet/broadcom/bnge/Makefile index b8dbbc2d59726..1144594fc3f69 100644 --- a/drivers/net/ethernet/broadcom/bnge/Makefile +++ b/drivers/net/ethernet/broadcom/bnge/Makefile @@ -5,4 +5,5 @@ obj-$(CONFIG_BNGE) += bng_en.o bng_en-y := bnge_core.o \ bnge_devlink.o \ bnge_hwrm.o \ - bnge_hwrm_lib.o + bnge_hwrm_lib.o \ + bnge_rmem.o diff --git a/drivers/net/ethernet/broadcom/bnge/bnge_rmem.c b/drivers/net/ethernet/broadcom/bnge/bnge_rmem.c new file mode 100644 index 0000000000000..ef232c4217bc8 --- /dev/null +++ b/drivers/net/ethernet/broadcom/bnge/bnge_rmem.c @@ -0,0 +1,101 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2025 Broadcom. + +#include +#include +#include +#include +#include +#include +#include +#include + +#include "bnge.h" +#include "../bnxt/bnxt_hsi.h" +#include "bnge_hwrm_lib.h" +#include "bnge_rmem.h" + +void bnge_free_ring(struct bnge_dev *bd, struct bnge_ring_mem_info *rmem) +{ + struct pci_dev *pdev = bd->pdev; + int i; + + if (!rmem->pg_arr) + goto skip_pages; + + for (i = 0; i < rmem->nr_pages; i++) { + if (!rmem->pg_arr[i]) + continue; + + dma_free_coherent(&pdev->dev, rmem->page_size, + rmem->pg_arr[i], rmem->dma_arr[i]); + + rmem->pg_arr[i] = NULL; + } +skip_pages: + if (rmem->pg_tbl) { + size_t pg_tbl_size = rmem->nr_pages * 8; + + if (rmem->flags & BNGE_RMEM_USE_FULL_PAGE_FLAG) + pg_tbl_size = rmem->page_size; + dma_free_coherent(&pdev->dev, pg_tbl_size, + rmem->pg_tbl, rmem->dma_pg_tbl); + rmem->pg_tbl = NULL; + } + if (rmem->vmem_size && *rmem->vmem) { + vfree(*rmem->vmem); + *rmem->vmem = NULL; + } +} + +int bnge_alloc_ring(struct bnge_dev *bd, struct bnge_ring_mem_info *rmem) +{ + struct pci_dev *pdev = bd->pdev; + u64 valid_bit = 0; + int i; + + if (rmem->flags & (BNGE_RMEM_VALID_PTE_FLAG | BNGE_RMEM_RING_PTE_FLAG)) + valid_bit = PTU_PTE_VALID; + + if ((rmem->nr_pages > 1 || rmem->depth > 0) && !rmem->pg_tbl) { + size_t pg_tbl_size = rmem->nr_pages * 8; + + if (rmem->flags & BNGE_RMEM_USE_FULL_PAGE_FLAG) + pg_tbl_size = rmem->page_size; + rmem->pg_tbl = dma_alloc_coherent(&pdev->dev, pg_tbl_size, + &rmem->dma_pg_tbl, + GFP_KERNEL); + if (!rmem->pg_tbl) + return -ENOMEM; + } + + for (i = 0; i < rmem->nr_pages; i++) { + u64 extra_bits = valid_bit; + + rmem->pg_arr[i] = dma_alloc_coherent(&pdev->dev, + rmem->page_size, + &rmem->dma_arr[i], + GFP_KERNEL); + if (!rmem->pg_arr[i]) + return -ENOMEM; + + if (rmem->nr_pages > 1 || rmem->depth > 0) { + if (i == rmem->nr_pages - 2 && + (rmem->flags & BNGE_RMEM_RING_PTE_FLAG)) + extra_bits |= PTU_PTE_NEXT_TO_LAST; + else if (i == rmem->nr_pages - 1 && + (rmem->flags & BNGE_RMEM_RING_PTE_FLAG)) + extra_bits |= PTU_PTE_LAST; + rmem->pg_tbl[i] = + cpu_to_le64(rmem->dma_arr[i] | extra_bits); + } + } + + if (rmem->vmem_size) { + *rmem->vmem = vzalloc(rmem->vmem_size); + if (!(*rmem->vmem)) + return -ENOMEM; + } + + return 0; +} diff --git a/drivers/net/ethernet/broadcom/bnge/bnge_rmem.h b/drivers/net/ethernet/broadcom/bnge/bnge_rmem.h new file mode 100644 index 0000000000000..56de31ed6613d --- /dev/null +++ b/drivers/net/ethernet/broadcom/bnge/bnge_rmem.h @@ -0,0 +1,35 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* Copyright (c) 2025 Broadcom */ + +#ifndef _BNGE_RMEM_H_ +#define _BNGE_RMEM_H_ + +#define PTU_PTE_VALID 0x1UL +#define PTU_PTE_LAST 0x2UL +#define PTU_PTE_NEXT_TO_LAST 0x4UL + +struct bnge_ring_mem_info { + /* Number of pages to next level */ + int nr_pages; + int page_size; + u16 flags; +#define BNGE_RMEM_VALID_PTE_FLAG 1 +#define BNGE_RMEM_RING_PTE_FLAG 2 +#define BNGE_RMEM_USE_FULL_PAGE_FLAG 4 + + u16 depth; + + void **pg_arr; + dma_addr_t *dma_arr; + + __le64 *pg_tbl; + dma_addr_t dma_pg_tbl; + + int vmem_size; + void **vmem; +}; + +int bnge_alloc_ring(struct bnge_dev *bd, struct bnge_ring_mem_info *rmem); +void bnge_free_ring(struct bnge_dev *bd, struct bnge_ring_mem_info *rmem); + +#endif /* _BNGE_RMEM_H_ */ -- 2.47.2