netdev - [PATCH net-next 4/5] gve: Add page size register to the register_page

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Date: Mon, 27 Nov 2023 16:26:47 -0800
From: John Fraker <jfraker@...gle.com>
To: netdev@...r.kernel.org
Cc: John Fraker <jfraker@...gle.com>, Jordan Kimbrough <jrkim@...gle.com>, 
	Willem de Bruijn <willemb@...gle.com>
Subject: [PATCH net-next 4/5] gve: Add page size register to the
 register_page_list command.

This register is required on platforms with page sizes greater than 4k.
This is because the tx side of the driver vmaps the entire queue page
list of pages into a single flat address space, then uses the entire
space. Without communicating the guest page size to the backend, the
backend will only access the first 4k of each page in the queue page list.

Signed-off-by: Jordan Kimbrough <jrkim@...gle.com>
Signed-off-by: John Fraker <jfraker@...gle.com>
Reviewed-by: Willem de Bruijn <willemb@...gle.com>
---
 drivers/net/ethernet/google/gve/gve_adminq.c | 1 +
 drivers/net/ethernet/google/gve/gve_adminq.h | 3 ++-
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/google/gve/gve_adminq.c b/drivers/net/ethernet/google/gve/gve_adminq.c
index bebb7ed11..12fbd723e 100644
--- a/drivers/net/ethernet/google/gve/gve_adminq.c
+++ b/drivers/net/ethernet/google/gve/gve_adminq.c
@@ -917,6 +917,7 @@ int gve_adminq_register_page_list(struct gve_priv *priv,
 		.page_list_id = cpu_to_be32(qpl->id),
 		.num_pages = cpu_to_be32(num_entries),
 		.page_address_list_addr = cpu_to_be64(page_list_bus),
+		.page_size = cpu_to_be64(PAGE_SIZE),
 	};
 
 	err = gve_adminq_execute_cmd(priv, &cmd);
diff --git a/drivers/net/ethernet/google/gve/gve_adminq.h b/drivers/net/ethernet/google/gve/gve_adminq.h
index 38a22279e..5865ccdcc 100644
--- a/drivers/net/ethernet/google/gve/gve_adminq.h
+++ b/drivers/net/ethernet/google/gve/gve_adminq.h
@@ -219,9 +219,10 @@ struct gve_adminq_register_page_list {
 	__be32 page_list_id;
 	__be32 num_pages;
 	__be64 page_address_list_addr;
+	__be64 page_size;
 };
 
-static_assert(sizeof(struct gve_adminq_register_page_list) == 16);
+static_assert(sizeof(struct gve_adminq_register_page_list) == 24);
 
 struct gve_adminq_unregister_page_list {
 	__be32 page_list_id;
-- 
2.43.0.rc1.413.gea7ed67945-goog