Commit b286a065 authored by Karsten Graul's avatar Karsten Graul Committed by David S. Miller

net/smc: handle incoming CDC validation message

Call smc_cdc_msg_validate() when a CDC message with the failover
validation bit enabled was received. Validate that the sequence number
sent with the message is one we already have received. If not, messages
were lost and the connection is terminated using a new abort_work.
Signed-off-by: default avatarKarsten Graul <kgraul@linux.ibm.com>
Reviewed-by: default avatarUrsula Braun <ubraun@linux.ibm.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 29bd73db
......@@ -188,12 +188,14 @@ struct smc_connection {
spinlock_t acurs_lock; /* protect cursors */
#endif
struct work_struct close_work; /* peer sent some closing */
struct work_struct abort_work; /* abort the connection */
struct tasklet_struct rx_tsklet; /* Receiver tasklet for SMC-D */
u8 rx_off; /* receive offset:
* 0 for SMC-R, 32 for SMC-D
*/
u64 peer_token; /* SMC-D token of peer */
u8 killed : 1; /* abnormal termination */
u8 out_of_sync : 1; /* out of sync with peer */
};
struct smc_sock { /* smc sock container */
......
......@@ -282,6 +282,28 @@ static void smc_cdc_handle_urg_data_arrival(struct smc_sock *smc,
sk_send_sigurg(&smc->sk);
}
static void smc_cdc_msg_validate(struct smc_sock *smc, struct smc_cdc_msg *cdc,
struct smc_link *link)
{
struct smc_connection *conn = &smc->conn;
u16 recv_seq = ntohs(cdc->seqno);
s16 diff;
/* check that seqnum was seen before */
diff = conn->local_rx_ctrl.seqno - recv_seq;
if (diff < 0) { /* diff larger than 0x7fff */
/* drop connection */
conn->out_of_sync = 1; /* prevent any further receives */
spin_lock_bh(&conn->send_lock);
conn->local_tx_ctrl.conn_state_flags.peer_conn_abort = 1;
conn->lnk = link;
spin_unlock_bh(&conn->send_lock);
sock_hold(&smc->sk); /* sock_put in abort_work */
if (!schedule_work(&conn->abort_work))
sock_put(&smc->sk);
}
}
static void smc_cdc_msg_recv_action(struct smc_sock *smc,
struct smc_cdc_msg *cdc)
{
......@@ -412,16 +434,19 @@ static void smc_cdc_rx_handler(struct ib_wc *wc, void *buf)
read_lock_bh(&lgr->conns_lock);
conn = smc_lgr_find_conn(ntohl(cdc->token), lgr);
read_unlock_bh(&lgr->conns_lock);
if (!conn)
if (!conn || conn->out_of_sync)
return;
smc = container_of(conn, struct smc_sock, conn);
if (!cdc->prod_flags.failover_validation) {
if (cdc->prod_flags.failover_validation) {
smc_cdc_msg_validate(smc, cdc, link);
return;
}
if (smc_cdc_before(ntohs(cdc->seqno),
conn->local_rx_ctrl.seqno))
/* received seqno is old */
return;
}
smc_cdc_msg_recv(smc, cdc);
}
......
......@@ -615,6 +615,8 @@ void smc_conn_free(struct smc_connection *conn)
tasklet_kill(&conn->rx_tsklet);
} else {
smc_cdc_tx_dismiss_slots(conn);
if (current_work() != &conn->abort_work)
cancel_work_sync(&conn->abort_work);
}
if (!list_empty(&lgr->list)) {
smc_lgr_unregister_conn(conn);
......@@ -996,6 +998,18 @@ void smc_smcr_terminate_all(struct smc_ib_device *smcibdev)
}
}
/* abort connection, abort_work scheduled from tasklet context */
static void smc_conn_abort_work(struct work_struct *work)
{
struct smc_connection *conn = container_of(work,
struct smc_connection,
abort_work);
struct smc_sock *smc = container_of(conn, struct smc_sock, conn);
smc_conn_kill(conn, true);
sock_put(&smc->sk); /* sock_hold done by schedulers of abort_work */
}
/* link is up - establish alternate link if applicable */
static void smcr_link_up(struct smc_link_group *lgr,
struct smc_ib_device *smcibdev, u8 ibport)
......@@ -1302,6 +1316,7 @@ int smc_conn_create(struct smc_sock *smc, struct smc_init_info *ini)
conn->local_tx_ctrl.common.type = SMC_CDC_MSG_TYPE;
conn->local_tx_ctrl.len = SMC_WR_TX_SIZE;
conn->urg_state = SMC_URG_READ;
INIT_WORK(&smc->conn.abort_work, smc_conn_abort_work);
if (ini->is_smcd) {
conn->rx_off = sizeof(struct smcd_cdc_msg);
smcd_cdc_rx_init(conn); /* init tasklet for this conn */
......
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