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Diffstat (limited to 'net/smc/smc_cdc.c')
-rw-r--r--net/smc/smc_cdc.c88
1 files changed, 76 insertions, 12 deletions
diff --git a/net/smc/smc_cdc.c b/net/smc/smc_cdc.c
index 164f1584861b..a47e8855e045 100644
--- a/net/smc/smc_cdc.c
+++ b/net/smc/smc_cdc.c
@@ -47,17 +47,20 @@ static void smc_cdc_tx_handler(struct smc_wr_tx_pend_priv *pnd_snd,
/* guarantee 0 <= sndbuf_space <= sndbuf_desc->len */
smp_mb__after_atomic();
smc_curs_copy(&conn->tx_curs_fin, &cdcpend->cursor, conn);
+ smc_curs_copy(&conn->local_tx_ctrl_fin, &cdcpend->p_cursor,
+ conn);
+ conn->tx_cdc_seq_fin = cdcpend->ctrl_seq;
}
smc_tx_sndbuf_nonfull(smc);
bh_unlock_sock(&smc->sk);
}
int smc_cdc_get_free_slot(struct smc_connection *conn,
+ struct smc_link *link,
struct smc_wr_buf **wr_buf,
struct smc_rdma_wr **wr_rdma_buf,
struct smc_cdc_tx_pend **pend)
{
- struct smc_link *link = &conn->lgr->lnk[SMC_SINGLE_LINK];
int rc;
rc = smc_wr_tx_get_free_slot(link, smc_cdc_tx_handler, wr_buf,
@@ -91,12 +94,10 @@ int smc_cdc_msg_send(struct smc_connection *conn,
struct smc_wr_buf *wr_buf,
struct smc_cdc_tx_pend *pend)
{
+ struct smc_link *link = conn->lnk;
union smc_host_cursor cfed;
- struct smc_link *link;
int rc;
- link = &conn->lgr->lnk[SMC_SINGLE_LINK];
-
smc_cdc_add_pending_send(conn, pend);
conn->tx_cdc_seq++;
@@ -106,22 +107,60 @@ int smc_cdc_msg_send(struct smc_connection *conn,
if (!rc) {
smc_curs_copy(&conn->rx_curs_confirmed, &cfed, conn);
conn->local_rx_ctrl.prod_flags.cons_curs_upd_req = 0;
+ } else {
+ conn->tx_cdc_seq--;
+ conn->local_tx_ctrl.seqno = conn->tx_cdc_seq;
}
return rc;
}
+/* send a validation msg indicating the move of a conn to an other QP link */
+int smcr_cdc_msg_send_validation(struct smc_connection *conn,
+ struct smc_cdc_tx_pend *pend,
+ struct smc_wr_buf *wr_buf)
+{
+ struct smc_host_cdc_msg *local = &conn->local_tx_ctrl;
+ struct smc_link *link = conn->lnk;
+ struct smc_cdc_msg *peer;
+ int rc;
+
+ peer = (struct smc_cdc_msg *)wr_buf;
+ peer->common.type = local->common.type;
+ peer->len = local->len;
+ peer->seqno = htons(conn->tx_cdc_seq_fin); /* seqno last compl. tx */
+ peer->token = htonl(local->token);
+ peer->prod_flags.failover_validation = 1;
+
+ rc = smc_wr_tx_send(link, (struct smc_wr_tx_pend_priv *)pend);
+ return rc;
+}
+
static int smcr_cdc_get_slot_and_msg_send(struct smc_connection *conn)
{
struct smc_cdc_tx_pend *pend;
struct smc_wr_buf *wr_buf;
+ struct smc_link *link;
+ bool again = false;
int rc;
- rc = smc_cdc_get_free_slot(conn, &wr_buf, NULL, &pend);
+again:
+ link = conn->lnk;
+ rc = smc_cdc_get_free_slot(conn, link, &wr_buf, NULL, &pend);
if (rc)
return rc;
spin_lock_bh(&conn->send_lock);
+ if (link != conn->lnk) {
+ /* link of connection changed, try again one time*/
+ spin_unlock_bh(&conn->send_lock);
+ smc_wr_tx_put_slot(link,
+ (struct smc_wr_tx_pend_priv *)pend);
+ if (again)
+ return -ENOLINK;
+ again = true;
+ goto again;
+ }
rc = smc_cdc_msg_send(conn, wr_buf, pend);
spin_unlock_bh(&conn->send_lock);
return rc;
@@ -165,7 +204,7 @@ static void smc_cdc_tx_dismisser(struct smc_wr_tx_pend_priv *tx_pend)
void smc_cdc_tx_dismiss_slots(struct smc_connection *conn)
{
- struct smc_link *link = &conn->lgr->lnk[SMC_SINGLE_LINK];
+ struct smc_link *link = conn->lnk;
smc_wr_tx_dismiss_slots(link, SMC_CDC_MSG_TYPE,
smc_cdc_tx_filter, smc_cdc_tx_dismisser,
@@ -239,6 +278,28 @@ 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)
{
@@ -369,16 +430,19 @@ 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 (smc_cdc_before(ntohs(cdc->seqno),
- conn->local_rx_ctrl.seqno))
- /* received seqno is old */
- return;
+ 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);
}