linux-kernel - [RFC PATCH 22/31] cifs: Add netmem allocation functions

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Message-ID: <20250806203705.2560493-23-dhowells@redhat.com>
Date: Wed,  6 Aug 2025 21:36:43 +0100
From: David Howells <dhowells@...hat.com>
To: Steve French <sfrench@...ba.org>
Cc: David Howells <dhowells@...hat.com>,
	Paulo Alcantara <pc@...guebit.org>,
	Shyam Prasad N <sprasad@...rosoft.com>,
	Tom Talpey <tom@...pey.com>,
	Wang Zhaolong <wangzhaolong@...weicloud.com>,
	Stefan Metzmacher <metze@...ba.org>,
	Mina Almasry <almasrymina@...gle.com>,
	linux-cifs@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	netfs@...ts.linux.dev,
	linux-fsdevel@...r.kernel.org
Subject: [RFC PATCH 22/31] cifs: Add netmem allocation functions

Add (stub) functions for doing netmem allocations.  We want to allocate
memory from the netmem buffering as that does bulk DMA and IOMMU
management.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Steve French <sfrench@...ba.org>
cc: Paulo Alcantara <pc@...guebit.org>
cc: Shyam Prasad N <sprasad@...rosoft.com>
cc: Tom Talpey <tom@...pey.com>
cc: linux-cifs@...r.kernel.org
cc: netfs@...ts.linux.dev
cc: linux-fsdevel@...r.kernel.org
---
 fs/smb/client/cifsproto.h |  3 +++
 fs/smb/client/transport.c | 15 +++++++++++++++
 2 files changed, 18 insertions(+)

diff --git a/fs/smb/client/cifsproto.h b/fs/smb/client/cifsproto.h
index 074b65bb57a5..ccd70a402567 100644
--- a/fs/smb/client/cifsproto.h
+++ b/fs/smb/client/cifsproto.h
@@ -766,4 +766,7 @@ void smb_get_message(struct smb_message *smb, enum smb_message_trace trace);
 void smb_put_message(struct smb_message *smb, enum smb_message_trace trace);
 void smb_put_messages(struct smb_message *smb);
 
+void *cifs_allocate_tx_buf(struct TCP_Server_Info *server, size_t size);
+void cifs_free_tx_buf(void *p);
+
 #endif			/* _CIFSPROTO_H */
diff --git a/fs/smb/client/transport.c b/fs/smb/client/transport.c
index 2ccfdd6b958b..b497bf319a7e 100644
--- a/fs/smb/client/transport.c
+++ b/fs/smb/client/transport.c
@@ -32,6 +32,21 @@
 #include "smbdirect.h"
 #include "compress.h"
 
+/*
+ * Allocate transmission buffers for a socket.  This memory will be allocated
+ * from the netmem buffers.  It comes with a page ref that we need to drop.
+ * The networking layer can pin it by getting its own ref.
+ */
+void *cifs_allocate_tx_buf(struct TCP_Server_Info *server, size_t size)
+{
+	return NULL; /* TODO */
+}
+
+void cifs_free_tx_buf(void *p)
+{
+	/* TODO */
+}
+
 struct smb_message *smb_message_alloc(enum smb2_command cmd, gfp_t gfp)
 {
 	static atomic_t debug_ids;