From: Long Li <longli@exchange.microsoft.com>
To: Steve French <sfrench@samba.org>,
linux-cifs@vger.kernel.org, samba-technical@lists.samba.org,
linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org,
Christoph Hellwig <hch@infradead.org>,
Tom Talpey <ttalpey@microsoft.com>,
Matthew Wilcox <mawilcox@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>
Cc: Long Li <longli@microsoft.com>
Subject: [Patch v8 06/16] CIFS: SMBD: Set SMB Direct maximum read or write size for I/O
Date: Wed, 22 Nov 2017 17:38:39 -0700 [thread overview]
Message-ID: <20171123003849.17093-7-longli@exchange.microsoft.com> (raw)
In-Reply-To: <20171123003849.17093-1-longli@exchange.microsoft.com>
From: Long Li <longli@microsoft.com>
When connecting over SMB Direct, the transport negotiates its maximum I/O sizes
with the server and determines how to choose to do RDMA send/recv vs
read/write. Expose these maximum I/O sizes to upper layer so we will get the
correct sized payloads.
Signed-off-by: Long Li <longli@microsoft.com>
---
fs/cifs/smb2ops.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index e067404..5e6a5e6 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -32,6 +32,7 @@
#include "smb2status.h"
#include "smb2glob.h"
#include "cifs_ioctl.h"
+#include "smbdirect.h"
static int
change_conf(struct TCP_Server_Info *server)
@@ -250,7 +251,11 @@ smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
/* start with specified wsize, or default */
wsize = volume_info->wsize ? volume_info->wsize : CIFS_DEFAULT_IOSIZE;
wsize = min_t(unsigned int, wsize, server->max_write);
-
+#ifdef CONFIG_CIFS_SMB_DIRECT
+ if (server->rdma)
+ wsize = min_t(unsigned int,
+ wsize, server->smbd_conn->max_readwrite_size);
+#endif
if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
wsize = min_t(unsigned int, wsize, SMB2_MAX_BUFFER_SIZE);
@@ -266,6 +271,11 @@ smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
/* start with specified rsize, or default */
rsize = volume_info->rsize ? volume_info->rsize : CIFS_DEFAULT_IOSIZE;
rsize = min_t(unsigned int, rsize, server->max_read);
+#ifdef CONFIG_CIFS_SMB_DIRECT
+ if (server->rdma)
+ rsize = min_t(unsigned int,
+ rsize, server->smbd_conn->max_readwrite_size);
+#endif
if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))
rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE);
--
2.7.4
next prev parent reply other threads:[~2017-11-23 0:38 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-23 0:38 [Patch v8 00/16] CIFS: Implement SMB Direct protocol Long Li
2017-11-23 0:38 ` [Patch v8 01/16] CIFS: SMBD: Upper layer connects to SMBDirect session Long Li
2017-11-23 0:38 ` [Patch v8 02/16] CIFS: SMBD: Implement function to reconnect to a SMB Direct transport Long Li
[not found] ` <20171123003849.17093-3-longli-Lp/cVzEoVyZiJJESP9tAQJZ3qXmFLfmx@public.gmane.org>
2018-01-03 17:51 ` Steve French
2017-11-23 0:38 ` [Patch v8 04/16] CIFS: SMBD: Implement function to destroy a SMB Direct connection Long Li
2017-11-23 0:38 ` Long Li [this message]
2017-11-23 0:38 ` [Patch v8 07/16] CIFS: SMBD: Implement function to receive data via RDMA receive Long Li
2017-11-23 0:38 ` [Patch v8 08/16] CIFS: SMBD: Upper layer receives " Long Li
[not found] ` <20171123003849.17093-1-longli-Lp/cVzEoVyZiJJESP9tAQJZ3qXmFLfmx@public.gmane.org>
2017-11-23 0:38 ` [Patch v8 03/16] CIFS: SMBD: Upper layer reconnects to SMB Direct session Long Li
2017-11-23 0:38 ` [Patch v8 05/16] CIFS: SMBD: Upper layer destroys SMB Direct session on shutdown or umount Long Li
2017-11-23 0:38 ` [Patch v8 09/16] CIFS: SMBD: Implement function to send data via RDMA send Long Li
2017-11-23 0:38 ` [Patch v8 12/16] CIFS: SMBD: Upper layer performs SMB write via RDMA read through memory registration Long Li
2018-01-01 23:28 ` [Patch v8 00/16] CIFS: Implement SMB Direct protocol Ronnie Sahlberg
2017-11-23 0:38 ` [Patch v8 10/16] CIFS: SMBD: Upper layer sends data via RDMA send Long Li
2017-11-23 0:38 ` [Patch v8 11/16] CIFS: SMBD: Implement RDMA memory registration Long Li
2017-11-23 0:38 ` [Patch v8 13/16] CIFS: SMBD: Read correct returned data length for RDMA write (SMB read) I/O Long Li
2017-11-23 0:38 ` [Patch v8 14/16] CIFS: SMBD: Upper layer performs SMB read via RDMA write through memory registration Long Li
[not found] ` <20171123003849.17093-15-longli-Lp/cVzEoVyZiJJESP9tAQJZ3qXmFLfmx@public.gmane.org>
2018-01-03 21:31 ` Steve French
2017-11-23 0:38 ` [Patch v8 15/16] CIFS: SMBD: Add SMB Direct debug counters Long Li
2017-11-23 0:38 ` [Patch v8 16/16] CIFS: SMBD: Disable signing on SMB direct transport Long Li
2017-12-28 21:57 ` [Patch v8 00/16] CIFS: Implement SMB Direct protocol Pavel Shilovskiy
2018-01-03 21:39 ` Steve French
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