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target/iscsi: split iscsit_check_dataout_hdr()

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Split iscsit_check_dataout_hdr() into two functions
1. __iscsit_check_dataout_hdr() - This function
   validates data out hdr.
2. iscsit_check_dataout_hdr() - This function finds
   iSCSI cmd using iscsit_find_cmd_from_itt_or_dump(),
   then it calls __iscsit_check_dataout_hdr() to
   validate iSCSI hdr.

This split is required to support Chelsio T6 iSCSI
DDP completion feature. T6 adapters reduce number of
completions to host by generating single completion
for all directly placed(DDP) iSCSI pdus in a sequence,
DDP completion contains iSCSI hdr of the last pdu in a
sequence.

On receiving DDP completion cxgbit driver will first
find iSCSI cmd using iscsit_find_cmd_from_itt_or_dump()
then updates cmd->write_data_done, cmd->next_burst_len,
cmd->data_sn and calls  __iscsit_check_dataout_hdr()
to validate iSCSI hdr.

(Move XRDSL check ahead of itt lookup / dump - nab)

Signed-off-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Varun Prakash
2017-01-13 20:53:21 +05:30
committed by Nicholas Bellinger
parent b2c9652eba
commit 9a584bf9bf
3 changed files with 50 additions and 27 deletions
Download Patch File Download Diff File Expand all files Collapse all files

65
drivers/target/iscsi/iscsi_target.c
View File

@@ -1431,36 +1431,17 @@ static void iscsit_do_crypto_hash_buf(
}
int
iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
struct iscsi_cmd **out_cmd)
__iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
struct iscsi_cmd *cmd, u32 payload_length,
bool *success)
{
struct iscsi_data *hdr = (struct iscsi_data *)buf;
struct iscsi_cmd *cmd = NULL;
struct iscsi_data *hdr = buf;
struct se_cmd *se_cmd;
u32 payload_length = ntoh24(hdr->dlength);
int rc;
if (!payload_length) {
pr_warn("DataOUT payload is ZERO, ignoring.\n");
return 0;
}
/* iSCSI write */
atomic_long_add(payload_length, &conn->sess->rx_data_octets);
if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
pr_err("DataSegmentLength: %u is greater than"
" MaxXmitDataSegmentLength: %u\n", payload_length,
conn->conn_ops->MaxXmitDataSegmentLength);
return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR,
buf);
}
cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt,
payload_length);
if (!cmd)
return 0;
pr_debug("Got DataOut ITT: 0x%08x, TTT: 0x%08x,"
" DataSN: 0x%08x, Offset: %u, Length: %u, CID: %hu\n",
hdr->itt, hdr->ttt, hdr->datasn, ntohl(hdr->offset),
@@ -1553,10 +1534,44 @@ iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf,
return 0;
else if (rc == DATAOUT_CANNOT_RECOVER)
return -1;
*out_cmd = cmd;
*success = true;
return 0;
}
EXPORT_SYMBOL(__iscsit_check_dataout_hdr);
int
iscsit_check_dataout_hdr(struct iscsi_conn *conn, void *buf,
struct iscsi_cmd **out_cmd)
{
struct iscsi_data *hdr = buf;
struct iscsi_cmd *cmd;
u32 payload_length = ntoh24(hdr->dlength);
int rc;
bool success = false;
if (!payload_length) {
pr_warn_ratelimited("DataOUT payload is ZERO, ignoring.\n");
return 0;
}
if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) {
pr_err_ratelimited("DataSegmentLength: %u is greater than"
" MaxXmitDataSegmentLength: %u\n", payload_length,
conn->conn_ops->MaxXmitDataSegmentLength);
return iscsit_add_reject(conn, ISCSI_REASON_PROTOCOL_ERROR, buf);
}
cmd = iscsit_find_cmd_from_itt_or_dump(conn, hdr->itt, payload_length);
if (!cmd)
return 0;
rc = __iscsit_check_dataout_hdr(conn, buf, cmd, payload_length, &success);
if (success)
*out_cmd = cmd;
return rc;
}
EXPORT_SYMBOL(iscsit_check_dataout_hdr);
static int