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author | 2015-02-09 18:07:25 +0200 | |
---|---|---|
committer | 2015-02-12 11:24:29 -0800 | |
commit | e4f4e8016e6823475291eb0da7cc95d0fada2237 (patch) | |
tree | d9e1bb4da2c4d3ce8f80d055055482f89d490741 /drivers/target/iscsi | |
parent | iser-target: Remove duplicate function names (diff) | |
download | linux-e4f4e8016e6823475291eb0da7cc95d0fada2237.tar.gz linux-e4f4e8016e6823475291eb0da7cc95d0fada2237.tar.bz2 linux-e4f4e8016e6823475291eb0da7cc95d0fada2237.zip |
iscsi/iser-target: Support multi-sequence sendtargets text response
In case sendtargets response is larger than initiator MRDSL, we
send a partial sendtargets response (setting F=0, C=1, TTT!=0xffffffff),
accept a consecutive empty text message and send the rest of the payload.
In case we are done, we set F=1, C=0, TTT=0xffffffff.
We do that by storing the sendtargets response bytes done under
the session.
This patch also makes iscsit_find_cmd_from_itt public for isert.
(Re-add cmd->maxcmdsn_inc and clear in iscsit_build_text_rsp - nab)
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
Diffstat (limited to 'drivers/target/iscsi')
-rw-r--r-- | drivers/target/iscsi/iscsi_target.c | 87 | ||||
-rw-r--r-- | drivers/target/iscsi/iscsi_target_util.c | 1 | ||||
-rw-r--r-- | drivers/target/iscsi/iscsi_target_util.h | 1 |
3 files changed, 66 insertions, 23 deletions
diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c index 75c29b687f35..f533a0dfa4de 100644 --- a/drivers/target/iscsi/iscsi_target.c +++ b/drivers/target/iscsi/iscsi_target.c @@ -1994,6 +1994,7 @@ iscsit_setup_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, cmd->cmd_sn = be32_to_cpu(hdr->cmdsn); cmd->exp_stat_sn = be32_to_cpu(hdr->exp_statsn); cmd->data_direction = DMA_NONE; + cmd->text_in_ptr = NULL; return 0; } @@ -2007,9 +2008,13 @@ iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int cmdsn_ret; if (!text_in) { - pr_err("Unable to locate text_in buffer for sendtargets" - " discovery\n"); - goto reject; + cmd->targ_xfer_tag = be32_to_cpu(hdr->ttt); + if (cmd->targ_xfer_tag == 0xFFFFFFFF) { + pr_err("Unable to locate text_in buffer for sendtargets" + " discovery\n"); + goto reject; + } + goto empty_sendtargets; } if (strncmp("SendTargets", text_in, 11) != 0) { pr_err("Received Text Data that is not" @@ -2036,6 +2041,7 @@ iscsit_process_text_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, list_add_tail(&cmd->i_conn_node, &conn->conn_cmd_list); spin_unlock_bh(&conn->cmd_lock); +empty_sendtargets: iscsit_ack_from_expstatsn(conn, be32_to_cpu(hdr->exp_statsn)); if (!(hdr->opcode & ISCSI_OP_IMMEDIATE)) { @@ -3385,7 +3391,8 @@ static bool iscsit_check_inaddr_any(struct iscsi_np *np) static int iscsit_build_sendtargets_response(struct iscsi_cmd *cmd, - enum iscsit_transport_type network_transport) + enum iscsit_transport_type network_transport, + int skip_bytes, bool *completed) { char *payload = NULL; struct iscsi_conn *conn = cmd->conn; @@ -3476,9 +3483,16 @@ iscsit_build_sendtargets_response(struct iscsi_cmd *cmd, end_of_buf = 1; goto eob; } - memcpy(payload + payload_len, buf, len); - payload_len += len; - target_name_printed = 1; + + if (skip_bytes && len <= skip_bytes) { + skip_bytes -= len; + } else { + memcpy(payload + payload_len, buf, len); + payload_len += len; + target_name_printed = 1; + if (len > skip_bytes) + skip_bytes = 0; + } } len = sprintf(buf, "TargetAddress=" @@ -3494,15 +3508,24 @@ iscsit_build_sendtargets_response(struct iscsi_cmd *cmd, end_of_buf = 1; goto eob; } - memcpy(payload + payload_len, buf, len); - payload_len += len; + + if (skip_bytes && len <= skip_bytes) { + skip_bytes -= len; + } else { + memcpy(payload + payload_len, buf, len); + payload_len += len; + if (len > skip_bytes) + skip_bytes = 0; + } } spin_unlock(&tpg->tpg_np_lock); } spin_unlock(&tiqn->tiqn_tpg_lock); eob: - if (end_of_buf) + if (end_of_buf) { + *completed = false; break; + } if (cmd->cmd_flags & IFC_SENDTARGETS_SINGLE) break; @@ -3520,13 +3543,23 @@ iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, enum iscsit_transport_type network_transport) { int text_length, padding; + bool completed = true; - text_length = iscsit_build_sendtargets_response(cmd, network_transport); + text_length = iscsit_build_sendtargets_response(cmd, network_transport, + cmd->read_data_done, + &completed); if (text_length < 0) return text_length; + if (completed) { + hdr->flags |= ISCSI_FLAG_CMD_FINAL; + } else { + hdr->flags |= ISCSI_FLAG_TEXT_CONTINUE; + cmd->read_data_done += text_length; + if (cmd->targ_xfer_tag == 0xFFFFFFFF) + cmd->targ_xfer_tag = session_get_next_ttt(conn->sess); + } 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; @@ -3535,21 +3568,25 @@ iscsit_build_text_rsp(struct iscsi_cmd *cmd, struct iscsi_conn *conn, hdr->statsn = cpu_to_be32(cmd->stat_sn); iscsit_increment_maxcmdsn(cmd, conn->sess); + /* + * Reset maxcmdsn_inc in multi-part text payload exchanges to + * correctly increment MaxCmdSN for each response answering a + * non immediate text request with a valid CmdSN. + */ + cmd->maxcmdsn_inc = 0; 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); + pr_debug("Built Text Response: ITT: 0x%08x, TTT: 0x%08x, StatSN: 0x%08x," + " Length: %u, CID: %hu F: %d C: %d\n", cmd->init_task_tag, + cmd->targ_xfer_tag, cmd->stat_sn, text_length, conn->cid, + !!(hdr->flags & ISCSI_FLAG_CMD_FINAL), + !!(hdr->flags & ISCSI_FLAG_TEXT_CONTINUE)); 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. - */ static int iscsit_send_text_rsp( struct iscsi_cmd *cmd, struct iscsi_conn *conn) @@ -4013,9 +4050,15 @@ static int iscsi_target_rx_opcode(struct iscsi_conn *conn, unsigned char *buf) ret = iscsit_handle_task_mgt_cmd(conn, cmd, buf); break; case ISCSI_OP_TEXT: - cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); - if (!cmd) - goto reject; + if (hdr->ttt != cpu_to_be32(0xFFFFFFFF)) { + cmd = iscsit_find_cmd_from_itt(conn, hdr->itt); + if (!cmd) + goto reject; + } else { + cmd = iscsit_allocate_cmd(conn, TASK_INTERRUPTIBLE); + if (!cmd) + goto reject; + } ret = iscsit_handle_text_cmd(conn, cmd, buf); break; diff --git a/drivers/target/iscsi/iscsi_target_util.c b/drivers/target/iscsi/iscsi_target_util.c index c211d3f2726c..390df8ed72b2 100644 --- a/drivers/target/iscsi/iscsi_target_util.c +++ b/drivers/target/iscsi/iscsi_target_util.c @@ -390,6 +390,7 @@ struct iscsi_cmd *iscsit_find_cmd_from_itt( init_task_tag, conn->cid); return NULL; } +EXPORT_SYMBOL(iscsit_find_cmd_from_itt); struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump( struct iscsi_conn *conn, diff --git a/drivers/target/iscsi/iscsi_target_util.h b/drivers/target/iscsi/iscsi_target_util.h index a68508c4fec8..1ab754a671ff 100644 --- a/drivers/target/iscsi/iscsi_target_util.h +++ b/drivers/target/iscsi/iscsi_target_util.h @@ -16,7 +16,6 @@ extern struct iscsi_r2t *iscsit_get_holder_for_r2tsn(struct iscsi_cmd *, u32); extern int iscsit_sequence_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, unsigned char * ,__be32 cmdsn); extern int iscsit_check_unsolicited_dataout(struct iscsi_cmd *, unsigned char *); -extern struct iscsi_cmd *iscsit_find_cmd_from_itt(struct iscsi_conn *, itt_t); extern struct iscsi_cmd *iscsit_find_cmd_from_itt_or_dump(struct iscsi_conn *, itt_t, u32); extern struct iscsi_cmd *iscsit_find_cmd_from_ttt(struct iscsi_conn *, u32); |