From f7950cb05d060b00db5e6102261417cef26c5789 Mon Sep 17 00:00:00 2001 From: Long Li Date: Thu, 26 Mar 2020 19:42:24 -0700 Subject: [PATCH] cifs: smbd: Calculate the correct maximum packet size for segmented SMBDirect send/receive The packet size needs to take account of SMB2 header size and possible encryption header size. This is only done when signing is used and it is for RDMA send/receive, not read/write. Also remove the dead SMBD code in smb2_negotiate_r(w)size. Signed-off-by: Long Li Signed-off-by: Steve French --- fs/cifs/smb2ops.c | 38 ++++++++++++++++---------------------- fs/cifs/smb2pdu.h | 3 +++ fs/cifs/smbdirect.c | 3 +-- 3 files changed, 20 insertions(+), 24 deletions(-) diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index 9c9258f..b36c46f 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -328,16 +328,6 @@ 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) { - 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); @@ -356,8 +346,15 @@ smb3_negotiate_wsize(struct cifs_tcon *tcon, struct smb_vol *volume_info) #ifdef CONFIG_CIFS_SMB_DIRECT if (server->rdma) { if (server->sign) + /* + * Account for SMB2 data transfer packet header and + * possible encryption header + */ wsize = min_t(unsigned int, - wsize, server->smbd_conn->max_fragmented_send_size); + wsize, + server->smbd_conn->max_fragmented_send_size - + SMB2_READWRITE_PDU_HEADER_SIZE - + sizeof(struct smb2_transform_hdr)); else wsize = min_t(unsigned int, wsize, server->smbd_conn->max_readwrite_size); @@ -378,16 +375,6 @@ 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) { - 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)) rsize = min_t(unsigned int, rsize, SMB2_MAX_BUFFER_SIZE); @@ -407,8 +394,15 @@ smb3_negotiate_rsize(struct cifs_tcon *tcon, struct smb_vol *volume_info) #ifdef CONFIG_CIFS_SMB_DIRECT if (server->rdma) { if (server->sign) + /* + * Account for SMB2 data transfer packet header and + * possible encryption header + */ rsize = min_t(unsigned int, - rsize, server->smbd_conn->max_fragmented_recv_size); + rsize, + server->smbd_conn->max_fragmented_recv_size - + SMB2_READWRITE_PDU_HEADER_SIZE - + sizeof(struct smb2_transform_hdr)); else rsize = min_t(unsigned int, rsize, server->smbd_conn->max_readwrite_size); diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h index dda928d..10acf90 100644 --- a/fs/cifs/smb2pdu.h +++ b/fs/cifs/smb2pdu.h @@ -120,6 +120,9 @@ struct smb2_sync_hdr { __u8 Signature[16]; } __packed; +/* The total header size for SMB2 read and write */ +#define SMB2_READWRITE_PDU_HEADER_SIZE (48 + sizeof(struct smb2_sync_hdr)) + struct smb2_sync_pdu { struct smb2_sync_hdr sync_hdr; __le16 StructureSize2; /* size of wct area (varies, request specific) */ diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c index 5b1b97e..a6ae29b 100644 --- a/fs/cifs/smbdirect.c +++ b/fs/cifs/smbdirect.c @@ -2097,8 +2097,7 @@ int smbd_send(struct TCP_Server_Info *server, for (i = 0; i < num_rqst; i++) remaining_data_length += smb_rqst_len(server, &rqst_array[i]); - if (remaining_data_length + sizeof(struct smbd_data_transfer) > - info->max_fragmented_send_size) { + if (remaining_data_length > info->max_fragmented_send_size) { log_write(ERR, "payload size %d > max size %d\n", remaining_data_length, info->max_fragmented_send_size); rc = -EINVAL; -- 2.7.4