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Message-ID: <20250618144743.843815-6-vikas.gupta@broadcom.com>
Date: Wed, 18 Jun 2025 14:47:35 +0000
From: Vikas Gupta <vikas.gupta@...adcom.com>
To: davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
andrew+netdev@...n.ch,
horms@...nel.org
Cc: netdev@...r.kernel.org,
linux-kernel@...r.kernel.org,
michael.chan@...adcom.com,
pavan.chebbi@...adcom.com,
vsrama-krishna.nemani@...adcom.com,
Vikas Gupta <vikas.gupta@...adcom.com>,
Bhargava Chenna Marreddy <bhargava.marreddy@...adcom.com>,
Rajashekar Hudumula <rajashekar.hudumula@...adcom.com>
Subject: [net-next, 05/10] 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 <vikas.gupta@...adcom.com>
Reviewed-by: Bhargava Chenna Marreddy <bhargava.marreddy@...adcom.com>
Reviewed-by: Rajashekar Hudumula <rajashekar.hudumula@...adcom.com>
---
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 b8dbbc2d5972..1144594fc3f6 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 000000000000..ef232c4217bc
--- /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 <linux/etherdevice.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/mm.h>
+#include <linux/dma-mapping.h>
+#include <linux/vmalloc.h>
+#include <linux/crash_dump.h>
+
+#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 000000000000..56de31ed6613
--- /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_ */
--
2.47.1
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