From 9c58b7ddd70dd7bfaac4ca87131f36d10aaba441 Mon Sep 17 00:00:00 2001 From: Roland Dreier Date: Wed, 15 Aug 2012 14:35:25 -0700 Subject: target: Simplify fabric sense data length handling Every fabric driver has to supply a se_tfo->set_fabric_sense_len() method, just so iSCSI can return an offset of 2. However, every fabric driver is already allocating a sense buffer and passing it into the target core, either via transport_init_se_cmd() or target_submit_cmd(). So instead of having iSCSI pass the start of its sense buffer into the core and then later tell the core to skip the first 2 bytes, it seems easier for iSCSI just to do the offset of 2 when it passes the sense buffer into the core. Then we can drop the se_tfo->set_fabric_sense_len() everywhere, and just add a couple of lines of code to iSCSI to set the sense data length to the beginning of the buffer right before it sends it over the network. (nab: Remove .set_fabric_sense_len usage from tcm_qla2xxx_npiv_ops + change transport_get_sense_buffer to follow v3.6-rc6 code w/o ->set_fabric_sense_len usage) Signed-off-by: Roland Dreier Signed-off-by: Nicholas Bellinger --- drivers/target/iscsi/iscsi_target.c | 13 ++++++++----- drivers/target/iscsi/iscsi_target_configfs.c | 16 ---------------- 2 files changed, 8 insertions(+), 21 deletions(-) (limited to 'drivers/target/iscsi') diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c index 97c0f78c3c9c..9cfdeedaadb6 100644 --- a/drivers/target/iscsi/iscsi_target.c +++ b/drivers/target/iscsi/iscsi_target.c @@ -953,7 +953,7 @@ done: */ transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops, conn->sess->se_sess, hdr->data_length, cmd->data_direction, - sam_task_attr, &cmd->sense_buffer[0]); + sam_task_attr, cmd->sense_buffer + 2); pr_debug("Got SCSI Command, ITT: 0x%08x, CmdSN: 0x%08x," " ExpXferLen: %u, Length: %u, CID: %hu\n", hdr->itt, @@ -1700,7 +1700,7 @@ static int iscsit_handle_task_mgt_cmd( transport_init_se_cmd(&cmd->se_cmd, &lio_target_fabric_configfs->tf_ops, conn->sess->se_sess, 0, DMA_NONE, - MSG_SIMPLE_TAG, &cmd->sense_buffer[0]); + MSG_SIMPLE_TAG, cmd->sense_buffer + 2); switch (function) { case ISCSI_TM_FUNC_ABORT_TASK: @@ -3092,15 +3092,18 @@ static int iscsit_send_status( if (cmd->se_cmd.sense_buffer && ((cmd->se_cmd.se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || (cmd->se_cmd.se_cmd_flags & SCF_EMULATED_TASK_SENSE))) { + put_unaligned_be16(cmd->se_cmd.scsi_sense_length, cmd->sense_buffer); + cmd->se_cmd.scsi_sense_length += sizeof (__be16); + padding = -(cmd->se_cmd.scsi_sense_length) & 3; hton24(hdr->dlength, cmd->se_cmd.scsi_sense_length); - iov[iov_count].iov_base = cmd->se_cmd.sense_buffer; + iov[iov_count].iov_base = cmd->sense_buffer; iov[iov_count++].iov_len = (cmd->se_cmd.scsi_sense_length + padding); tx_size += cmd->se_cmd.scsi_sense_length; if (padding) { - memset(cmd->se_cmd.sense_buffer + + memset(cmd->sense_buffer + cmd->se_cmd.scsi_sense_length, 0, padding); tx_size += padding; pr_debug("Adding %u bytes of padding to" @@ -3109,7 +3112,7 @@ static int iscsit_send_status( if (conn->conn_ops->DataDigest) { iscsit_do_crypto_hash_buf(&conn->conn_tx_hash, - cmd->se_cmd.sense_buffer, + cmd->sense_buffer, (cmd->se_cmd.scsi_sense_length + padding), 0, NULL, (u8 *)&cmd->data_crc); diff --git a/drivers/target/iscsi/iscsi_target_configfs.c b/drivers/target/iscsi/iscsi_target_configfs.c index 518fd4e86409..f86833fcf33c 100644 --- a/drivers/target/iscsi/iscsi_target_configfs.c +++ b/drivers/target/iscsi/iscsi_target_configfs.c @@ -1542,21 +1542,6 @@ static int lio_queue_status(struct se_cmd *se_cmd) return 0; } -static u16 lio_set_fabric_sense_len(struct se_cmd *se_cmd, u32 sense_length) -{ - unsigned char *buffer = se_cmd->sense_buffer; - /* - * From RFC-3720 10.4.7. Data Segment - Sense and Response Data Segment - * 16-bit SenseLength. - */ - buffer[0] = ((sense_length >> 8) & 0xff); - buffer[1] = (sense_length & 0xff); - /* - * Return two byte offset into allocated sense_buffer. - */ - return 2; -} - static int lio_queue_tm_rsp(struct se_cmd *se_cmd) { struct iscsi_cmd *cmd = container_of(se_cmd, struct iscsi_cmd, se_cmd); @@ -1740,7 +1725,6 @@ int iscsi_target_register_configfs(void) fabric->tf_ops.queue_data_in = &lio_queue_data_in; fabric->tf_ops.queue_status = &lio_queue_status; fabric->tf_ops.queue_tm_rsp = &lio_queue_tm_rsp; - fabric->tf_ops.set_fabric_sense_len = &lio_set_fabric_sense_len; /* * Setup function pointers for generic logic in target_core_fabric_configfs.c */ -- cgit v1.2.2