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iscsi-target: Refactor ISCSI_OP_TEXT_RSP TX handling 

This patch refactoring existing iscsit_send_text_rsp() in order
to handle iscsi_text_rsp payloads in a transport specific manner.

This includes the addition of iscsit_build_text_rsp() to build
the response payload and initialize ISCSI_OP_TEXT_RSP.

v2: Make iscsit_build_text_rsp() determine extra padding bytes, and
    drop legacy padding calculation for traditional iSCSI text
    responses within iscsit_send_text_rsp()

Reported-by: Or Gerlitz <ogerlitz@mellanox.com>
Cc: Or Gerlitz <ogerlitz@mellanox.com>
Cc: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2013-06-14 18:49:55 -07:00
parent 64534aa794
commit 889c8a68b8
2 changed files with 44 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

77
drivers/target/iscsi/iscsi_target.c
View File

@ -3461,6 +3461,37 @@ eob:
return payload_len;
}
int
iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn,
struct iscsi_text_rsp *hdr)
{
int text_length, padding;
text_length = iscsit_build_sendtargets_response(cmd);
if (text_length < 0)
return text_length;
hdr->opcode = ISCSI_OP_TEXT_RSP;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
padding = ((-text_length) & 3);
hton24(hdr->dlength, text_length);
hdr->itt = cmd->init_task_tag;
hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
cmd->stat_sn = conn->stat_sn++;
hdr->statsn = cpu_to_be32(cmd->stat_sn);
iscsit_increment_maxcmdsn(cmd, conn->sess);
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
" Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
text_length, conn->cid);
return text_length + padding;
}
EXPORT_SYMBOL(iscsit_build_text_rsp);
/*
* FIXME: Add support for F_BIT and C_BIT when the length is longer than
* MaxRecvDataSegmentLength.
@ -3469,44 +3500,23 @@ static int iscsit_send_text_rsp(
struct iscsi_cmd *cmd,
struct iscsi_conn *conn)
{
struct iscsi_text_rsp *hdr;
struct iscsi_text_rsp *hdr = (struct iscsi_text_rsp *)cmd->pdu;
struct kvec *iov;
u32 padding = 0, tx_size = 0;
int text_length, iov_count = 0;
u32 tx_size = 0;
int text_length, iov_count = 0, rc;
text_length = iscsit_build_sendtargets_response(cmd);
if (text_length < 0)
return text_length;
padding = ((-text_length) & 3);
if (padding != 0) {
memset(cmd->buf_ptr + text_length, 0, padding);
pr_debug("Attaching %u additional bytes for"
" padding.\n", padding);
}
hdr = (struct iscsi_text_rsp *) cmd->pdu;
memset(hdr, 0, ISCSI_HDR_LEN);
hdr->opcode = ISCSI_OP_TEXT_RSP;
hdr->flags |= ISCSI_FLAG_CMD_FINAL;
hton24(hdr->dlength, text_length);
hdr->itt = cmd->init_task_tag;
hdr->ttt = cpu_to_be32(cmd->targ_xfer_tag);
cmd->stat_sn = conn->stat_sn++;
hdr->statsn = cpu_to_be32(cmd->stat_sn);
iscsit_increment_maxcmdsn(cmd, conn->sess);
hdr->exp_cmdsn = cpu_to_be32(conn->sess->exp_cmd_sn);
hdr->max_cmdsn = cpu_to_be32(conn->sess->max_cmd_sn);
rc = iscsit_build_text_rsp(cmd, conn, hdr);
if (rc < 0)
return rc;
text_length = rc;
iov = &cmd->iov_misc[0];
iov[iov_count].iov_base = cmd->pdu;
iov[iov_count++].iov_len = ISCSI_HDR_LEN;
iov[iov_count].iov_base = cmd->buf_ptr;
iov[iov_count++].iov_len = text_length + padding;
iov[iov_count++].iov_len = text_length;
tx_size += (ISCSI_HDR_LEN + text_length + padding);
tx_size += (ISCSI_HDR_LEN + text_length);
if (conn->conn_ops->HeaderDigest) {
u32 *header_digest = (u32 *)&cmd->pdu[ISCSI_HDR_LEN];
@ -3522,7 +3532,7 @@ static int iscsit_send_text_rsp(
if (conn->conn_ops->DataDigest) {
iscsit_do_crypto_hash_buf(&conn->conn_tx_hash,
cmd->buf_ptr, (text_length + padding),
cmd->buf_ptr, text_length,
0, NULL, (u8 *)&cmd->data_crc);
iov[iov_count].iov_base = &cmd->data_crc;
@ -3530,16 +3540,13 @@ static int iscsit_send_text_rsp(
tx_size += ISCSI_CRC_LEN;
pr_debug("Attaching DataDigest for %u bytes of text"
" data, CRC 0x%08x\n", (text_length + padding),
" data, CRC 0x%08x\n", text_length,
cmd->data_crc);
}
cmd->iov_misc_count = iov_count;
cmd->tx_size = tx_size;
pr_debug("Built Text Response: ITT: 0x%08x, StatSN: 0x%08x,"
" Length: %u, CID: %hu\n", cmd->init_task_tag, cmd->stat_sn,
text_length, conn->cid);
return 0;
}

2
include/target/iscsi/iscsi_transport.h
View File

@ -63,6 +63,8 @@ extern void iscsit_build_nopin_rsp(struct iscsi_cmd *, struct iscsi_conn *,
struct iscsi_nopin *, bool);
extern void iscsit_build_task_mgt_rsp(struct iscsi_cmd *, struct iscsi_conn *,
struct iscsi_tm_rsp *);
extern int iscsit_build_text_rsp(struct iscsi_cmd *, struct iscsi_conn *,
struct iscsi_text_rsp *);
extern void iscsit_build_reject(struct iscsi_cmd *, struct iscsi_conn *,
struct iscsi_reject *);
extern int iscsit_build_logout_rsp(struct iscsi_cmd *, struct iscsi_conn *,