From: Nicholas Bellinger Date: Thu, 14 Nov 2013 02:54:45 +0000 (-0800) Subject: iscsi-target: Convert iscsi_session statistics to atomic_long_t X-Git-Tag: v3.13-rc1~5^2~11 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=04f3b31bff720f01d684100c868c88f67ced8dc8;p=profile%2Fivi%2Fkernel-x86-ivi.git iscsi-target: Convert iscsi_session statistics to atomic_long_t This patch converts a handful of iscsi_session statistics to type atomic_long_t, instead of using iscsi_session->session_stats_lock when incrementing these values. More importantly, go ahead and drop the spinlock usage within iscsit_setup_scsi_cmd(), iscsit_check_dataout_hdr(), iscsit_send_datain(), and iscsit_build_rsp_pdu() fast-path code. (Squash in Roland's target: Remove write-only stats fields and lock from struct se_node_acl) Signed-off-by: Nicholas Bellinger --- diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c index ba9787d..bf76fc4 100644 --- a/drivers/target/iscsi/iscsi_target.c +++ b/drivers/target/iscsi/iscsi_target.c @@ -800,14 +800,7 @@ int iscsit_setup_scsi_cmd(struct iscsi_conn *conn, struct iscsi_cmd *cmd, int iscsi_task_attr; int sam_task_attr; - spin_lock_bh(&conn->sess->session_stats_lock); - conn->sess->cmd_pdus++; - if (conn->sess->se_sess->se_node_acl) { - spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); - conn->sess->se_sess->se_node_acl->num_cmds++; - spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); - } - spin_unlock_bh(&conn->sess->session_stats_lock); + atomic_long_inc(&conn->sess->cmd_pdus); hdr = (struct iscsi_scsi_req *) buf; payload_length = ntoh24(hdr->dlength); @@ -1254,14 +1247,7 @@ iscsit_check_dataout_hdr(struct iscsi_conn *conn, unsigned char *buf, } /* iSCSI write */ - spin_lock_bh(&conn->sess->session_stats_lock); - conn->sess->rx_data_octets += payload_length; - if (conn->sess->se_sess->se_node_acl) { - spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); - conn->sess->se_sess->se_node_acl->write_bytes += payload_length; - spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); - } - spin_unlock_bh(&conn->sess->session_stats_lock); + atomic_long_add(payload_length, &conn->sess->rx_data_octets); if (payload_length > conn->conn_ops->MaxXmitDataSegmentLength) { pr_err("DataSegmentLength: %u is greater than" @@ -2631,14 +2617,7 @@ static int iscsit_send_datain(struct iscsi_cmd *cmd, struct iscsi_conn *conn) return -1; } - spin_lock_bh(&conn->sess->session_stats_lock); - conn->sess->tx_data_octets += datain.length; - if (conn->sess->se_sess->se_node_acl) { - spin_lock(&conn->sess->se_sess->se_node_acl->stats_lock); - conn->sess->se_sess->se_node_acl->read_bytes += datain.length; - spin_unlock(&conn->sess->se_sess->se_node_acl->stats_lock); - } - spin_unlock_bh(&conn->sess->session_stats_lock); + atomic_long_add(datain.length, &conn->sess->tx_data_octets); /* * Special case for successfully execution w/ both DATAIN * and Sense Data. @@ -3163,9 +3142,7 @@ void iscsit_build_rsp_pdu(struct iscsi_cmd *cmd, struct iscsi_conn *conn, if (inc_stat_sn) cmd->stat_sn = conn->stat_sn++; - spin_lock_bh(&conn->sess->session_stats_lock); - conn->sess->rsp_pdus++; - spin_unlock_bh(&conn->sess->session_stats_lock); + atomic_long_inc(&conn->sess->rsp_pdus); memset(hdr, 0, ISCSI_HDR_LEN); hdr->opcode = ISCSI_OP_SCSI_CMD_RSP; @@ -4114,9 +4091,7 @@ restart: * hit default in the switch below. */ memset(buffer, 0xff, ISCSI_HDR_LEN); - spin_lock_bh(&conn->sess->session_stats_lock); - conn->sess->conn_digest_errors++; - spin_unlock_bh(&conn->sess->session_stats_lock); + atomic_long_inc(&conn->sess->conn_digest_errors); } else { pr_debug("Got HeaderDigest CRC32C" " 0x%08x\n", checksum); diff --git a/drivers/target/iscsi/iscsi_target_core.h b/drivers/target/iscsi/iscsi_target_core.h index b03ee2f..f2094d2 100644 --- a/drivers/target/iscsi/iscsi_target_core.h +++ b/drivers/target/iscsi/iscsi_target_core.h @@ -651,14 +651,13 @@ struct iscsi_session { /* Used for session reference counting */ int session_usage_count; int session_waiting_on_uc; - u32 cmd_pdus; - u32 rsp_pdus; - u64 tx_data_octets; - u64 rx_data_octets; - u32 conn_digest_errors; - u32 conn_timeout_errors; + atomic_long_t cmd_pdus; + atomic_long_t rsp_pdus; + atomic_long_t tx_data_octets; + atomic_long_t rx_data_octets; + atomic_long_t conn_digest_errors; + atomic_long_t conn_timeout_errors; u64 creation_time; - spinlock_t session_stats_lock; /* Number of active connections */ atomic_t nconn; atomic_t session_continuation; diff --git a/drivers/target/iscsi/iscsi_target_erl0.c b/drivers/target/iscsi/iscsi_target_erl0.c index cbea7f1..0d1e6ee 100644 --- a/drivers/target/iscsi/iscsi_target_erl0.c +++ b/drivers/target/iscsi/iscsi_target_erl0.c @@ -785,7 +785,7 @@ static void iscsit_handle_time2retain_timeout(unsigned long data) tiqn->sess_err_stats.last_sess_failure_type = ISCSI_SESS_ERR_CXN_TIMEOUT; tiqn->sess_err_stats.cxn_timeout_errors++; - sess->conn_timeout_errors++; + atomic_long_inc(&sess->conn_timeout_errors); spin_unlock(&tiqn->sess_err_stats.lock); } } diff --git a/drivers/target/iscsi/iscsi_target_login.c b/drivers/target/iscsi/iscsi_target_login.c index 646632a..4eb93b2 100644 --- a/drivers/target/iscsi/iscsi_target_login.c +++ b/drivers/target/iscsi/iscsi_target_login.c @@ -305,7 +305,6 @@ static int iscsi_login_zero_tsih_s1( } sess->creation_time = get_jiffies_64(); - spin_lock_init(&sess->session_stats_lock); /* * The FFP CmdSN window values will be allocated from the TPG's * Initiator Node's ACL once the login has been successfully completed. diff --git a/drivers/target/iscsi/iscsi_target_stat.c b/drivers/target/iscsi/iscsi_target_stat.c index f788e8b..1033955 100644 --- a/drivers/target/iscsi/iscsi_target_stat.c +++ b/drivers/target/iscsi/iscsi_target_stat.c @@ -792,7 +792,8 @@ static ssize_t iscsi_stat_sess_show_attr_cmd_pdus( if (se_sess) { sess = se_sess->fabric_sess_ptr; if (sess) - ret = snprintf(page, PAGE_SIZE, "%u\n", sess->cmd_pdus); + ret = snprintf(page, PAGE_SIZE, "%lu\n", + atomic_long_read(&sess->cmd_pdus)); } spin_unlock_bh(&se_nacl->nacl_sess_lock); @@ -815,7 +816,8 @@ static ssize_t iscsi_stat_sess_show_attr_rsp_pdus( if (se_sess) { sess = se_sess->fabric_sess_ptr; if (sess) - ret = snprintf(page, PAGE_SIZE, "%u\n", sess->rsp_pdus); + ret = snprintf(page, PAGE_SIZE, "%lu\n", + atomic_long_read(&sess->rsp_pdus)); } spin_unlock_bh(&se_nacl->nacl_sess_lock); @@ -838,8 +840,8 @@ static ssize_t iscsi_stat_sess_show_attr_txdata_octs( if (se_sess) { sess = se_sess->fabric_sess_ptr; if (sess) - ret = snprintf(page, PAGE_SIZE, "%llu\n", - (unsigned long long)sess->tx_data_octets); + ret = snprintf(page, PAGE_SIZE, "%lu\n", + atomic_long_read(&sess->tx_data_octets)); } spin_unlock_bh(&se_nacl->nacl_sess_lock); @@ -862,8 +864,8 @@ static ssize_t iscsi_stat_sess_show_attr_rxdata_octs( if (se_sess) { sess = se_sess->fabric_sess_ptr; if (sess) - ret = snprintf(page, PAGE_SIZE, "%llu\n", - (unsigned long long)sess->rx_data_octets); + ret = snprintf(page, PAGE_SIZE, "%lu\n", + atomic_long_read(&sess->rx_data_octets)); } spin_unlock_bh(&se_nacl->nacl_sess_lock); @@ -886,8 +888,8 @@ static ssize_t iscsi_stat_sess_show_attr_conn_digest_errors( if (se_sess) { sess = se_sess->fabric_sess_ptr; if (sess) - ret = snprintf(page, PAGE_SIZE, "%u\n", - sess->conn_digest_errors); + ret = snprintf(page, PAGE_SIZE, "%lu\n", + atomic_long_read(&sess->conn_digest_errors)); } spin_unlock_bh(&se_nacl->nacl_sess_lock); @@ -910,8 +912,8 @@ static ssize_t iscsi_stat_sess_show_attr_conn_timeout_errors( if (se_sess) { sess = se_sess->fabric_sess_ptr; if (sess) - ret = snprintf(page, PAGE_SIZE, "%u\n", - sess->conn_timeout_errors); + ret = snprintf(page, PAGE_SIZE, "%lu\n", + atomic_long_read(&sess->conn_timeout_errors)); } spin_unlock_bh(&se_nacl->nacl_sess_lock); diff --git a/drivers/target/iscsi/iscsi_target_util.c b/drivers/target/iscsi/iscsi_target_util.c index f2de28e..45b8fd1 100644 --- a/drivers/target/iscsi/iscsi_target_util.c +++ b/drivers/target/iscsi/iscsi_target_util.c @@ -980,7 +980,7 @@ static void iscsit_handle_nopin_response_timeout(unsigned long data) tiqn->sess_err_stats.last_sess_failure_type = ISCSI_SESS_ERR_CXN_TIMEOUT; tiqn->sess_err_stats.cxn_timeout_errors++; - conn->sess->conn_timeout_errors++; + atomic_long_inc(&conn->sess->conn_timeout_errors); spin_unlock_bh(&tiqn->sess_err_stats.lock); } }