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cifs: smbd: Don't use RDMA read/write when signing is used

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SMB server will not sign data transferred through RDMA read/write. When
signing is used, it's a good idea to have all the data signed.

In this case, use RDMA send/recv for all data transfers. This will degrade
performance as this is not generally configured in RDMA environemnt. So
warn the user on signing and RDMA send/recv.

Signed-off-by: Long Li <longli@microsoft.com>
Acked-by: Ronnie Sahlberg <lsahlber@redhat.com>
Cc: stable@vger.kernel.org
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Long Li 2018-04-17 12:17:08 -07:00 committed by Steve French
parent 0d5ec281c0
commit bb4c041947
3 changed files with 19 additions and 6 deletions
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3
fs/cifs/cifssmb.c
View File

@ -455,6 +455,9 @@ cifs_enable_signing(struct TCP_Server_Info *server, bool mnt_sign_required)
server->sign = true;
}
if (cifs_rdma_enabled(server) && server->sign)
cifs_dbg(VFS, "Signing is enabled, and RDMA read/write will be disabled");
return 0;
}

18
fs/cifs/smb2ops.c
View File

@ -252,9 +252,14 @@ smb2_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
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,
if (server->rdma) {
if (server->sign)
wsize = min_t(unsigned int,
wsize, server->smbd_conn->max_fragmented_send_size);
else
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);
@ -272,9 +277,14 @@ smb2_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info)
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,
if (server->rdma) {
if (server->sign)
rsize = min_t(unsigned int,
rsize, server->smbd_conn->max_fragmented_recv_size);
else
rsize = min_t(unsigned int,
rsize, server->smbd_conn->max_readwrite_size);
}
#endif
if (!(server->capabilities & SMB2_GLOBAL_CAP_LARGE_MTU))

4
fs/cifs/smb2pdu.c
View File

@ -2591,7 +2591,7 @@ smb2_new_read_req(void **buf, unsigned int *total_len,
* If we want to do a RDMA write, fill in and append
* smbd_buffer_descriptor_v1 to the end of read request
*/
if (server->rdma && rdata &&
if (server->rdma && rdata && !server->sign &&
rdata->bytes >= server->smbd_conn->rdma_readwrite_threshold) {
struct smbd_buffer_descriptor_v1 *v1;
@ -2969,7 +2969,7 @@ smb2_async_writev(struct cifs_writedata *wdata,
* If we want to do a server RDMA read, fill in and append
* smbd_buffer_descriptor_v1 to the end of write request
*/
if (server->rdma && wdata->bytes >=
if (server->rdma && !server->sign && wdata->bytes >=
server->smbd_conn->rdma_readwrite_threshold) {
struct smbd_buffer_descriptor_v1 *v1;