ksmbd: decrease the number of SMB3 smbdirect server SGEs

[ Upstream commit 2b4eeeaa90617c5e37da7c804c422b4e833b87b2 ]

The server-side SMBDirect layer requires no more than 6 send SGEs
The previous default of 8 causes ksmbd to fail on the SoftiWARP
(siw) provider, and possibly others. Additionally, large numbers
of SGEs reduces performance significantly on adapter implementations.

Signed-off-by: Tom Talpey <tom@talpey.com>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ksmbd/transport_rdma.c b/fs/ksmbd/transport_rdma.c
index 7bac4b09c84423826b469bfacc7158705ec2604d..ef4891b54447f12bfff7def54abbb50e42926637 100644 (file)
--- a/fs/ksmbd/transport_rdma.c
+++ b/fs/ksmbd/transport_rdma.c
@@ -32,7 +32,7 @@
 /* SMB_DIRECT negotiation timeout in seconds */
 #define SMB_DIRECT_NEGOTIATE_TIMEOUT           120
 
-#define SMB_DIRECT_MAX_SEND_SGES               8
+#define SMB_DIRECT_MAX_SEND_SGES               6
 #define SMB_DIRECT_MAX_RECV_SGES               1
 
 /*