netdev - [PATCH net-next 06/23] bnxt_en: Add new flags to setup new page table PTE bits on newer devices.

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Date:   Sun, 14 Oct 2018 07:02:42 -0400
From:   Michael Chan <michael.chan@...adcom.com>
To:     davem@...emloft.net
Cc:     netdev@...r.kernel.org
Subject: [PATCH net-next 06/23] bnxt_en: Add new flags to setup new page table PTE bits on newer devices.

Newer chips require the PTU_PTE_VALID bit to be set for every page
table entry for context memory and rings.  Additional bits are also
required for page table entries for all rings.  Add a flags field to
bnxt_ring_mem_info struct to specify these additional bits to be used
when setting up the pages tables as needed.

Signed-off-by: Michael Chan <michael.chan@...adcom.com>
---
 drivers/net/ethernet/broadcom/bnxt/bnxt.c | 17 +++++++++++++++--
 drivers/net/ethernet/broadcom/bnxt/bnxt.h |  8 ++++++++
 2 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index 602dc09..f0da558 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -2230,8 +2230,11 @@ static void bnxt_free_ring(struct bnxt *bp, struct bnxt_ring_mem_info *rmem)
 static int bnxt_alloc_ring(struct bnxt *bp, struct bnxt_ring_mem_info *rmem)
 {
 	struct pci_dev *pdev = bp->pdev;
+	u64 valid_bit = 0;
 	int i;
 
+	if (rmem->flags & (BNXT_RMEM_VALID_PTE_FLAG | BNXT_RMEM_RING_PTE_FLAG))
+		valid_bit = PTU_PTE_VALID;
 	if (rmem->nr_pages > 1) {
 		rmem->pg_tbl = dma_alloc_coherent(&pdev->dev,
 						  rmem->nr_pages * 8,
@@ -2242,6 +2245,8 @@ static int bnxt_alloc_ring(struct bnxt *bp, struct bnxt_ring_mem_info *rmem)
 	}
 
 	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],
@@ -2249,8 +2254,16 @@ static int bnxt_alloc_ring(struct bnxt *bp, struct bnxt_ring_mem_info *rmem)
 		if (!rmem->pg_arr[i])
 			return -ENOMEM;
 
-		if (rmem->nr_pages > 1)
-			rmem->pg_tbl[i] = cpu_to_le64(rmem->dma_arr[i]);
+		if (rmem->nr_pages > 1) {
+			if (i == rmem->nr_pages - 2 &&
+			    (rmem->flags & BNXT_RMEM_RING_PTE_FLAG))
+				extra_bits |= PTU_PTE_NEXT_TO_LAST;
+			else if (i == rmem->nr_pages - 1 &&
+				 (rmem->flags & BNXT_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) {
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.h b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
index 2e4b621..5792e5c 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.h
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.h
@@ -580,6 +580,10 @@ struct bnxt_sw_rx_agg_bd {
 struct bnxt_ring_mem_info {
 	int			nr_pages;
 	int			page_size;
+	u32			flags;
+#define BNXT_RMEM_VALID_PTE_FLAG	1
+#define BNXT_RMEM_RING_PTE_FLAG		2
+
 	void			**pg_arr;
 	dma_addr_t		*dma_arr;
 
@@ -1109,6 +1113,10 @@ struct bnxt_vf_rep {
 	struct bnxt_vf_rep_stats	tx_stats;
 };
 
+#define PTU_PTE_VALID             0x1UL
+#define PTU_PTE_LAST              0x2UL
+#define PTU_PTE_NEXT_TO_LAST      0x4UL
+
 struct bnxt {
 	void __iomem		*bar0;
 	void __iomem		*bar1;
-- 
2.5.1