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net/smc: switch connections to alternate link

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Add smc_switch_conns() to switch all connections from a link that is
going down. Find an other link to switch the connections to, and
switch each connection to the new link. smc_switch_cursor() updates the
cursors of a connection to the state of the last successfully sent CDC
message. When there is no link to switch to, terminate the link group.
Call smc_switch_conns() when a link is going down.
And with the possibility that links of connections can switch adapt CDC
and TX functions to detect and handle link switches.

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Reviewed-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Karsten Graul
2020-05-04 14:18:38 +02:00
committed by David S. Miller
parent f0ec4f1d32
commit c6f02ebeea
6 changed files with 162 additions and 9 deletions
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12
net/smc/smc_tx.c
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@@ -482,12 +482,13 @@ static int smc_tx_rdma_writes(struct smc_connection *conn,
static int smcr_tx_sndbuf_nonempty(struct smc_connection *conn)
{
struct smc_cdc_producer_flags *pflags = &conn->local_tx_ctrl.prod_flags;
struct smc_link *link = conn->lnk;
struct smc_rdma_wr *wr_rdma_buf;
struct smc_cdc_tx_pend *pend;
struct smc_wr_buf *wr_buf;
int rc;
rc = smc_cdc_get_free_slot(conn, &wr_buf, &wr_rdma_buf, &pend);
rc = smc_cdc_get_free_slot(conn, link, &wr_buf, &wr_rdma_buf, &pend);
if (rc < 0) {
if (rc == -EBUSY) {
struct smc_sock *smc =
@@ -505,10 +506,17 @@ static int smcr_tx_sndbuf_nonempty(struct smc_connection *conn)
}
spin_lock_bh(&conn->send_lock);
if (link != conn->lnk) {
/* link of connection changed, tx_work will restart */
smc_wr_tx_put_slot(link,
(struct smc_wr_tx_pend_priv *)pend);
rc = -ENOLINK;
goto out_unlock;
}
if (!pflags->urg_data_present) {
rc = smc_tx_rdma_writes(conn, wr_rdma_buf);
if (rc) {
smc_wr_tx_put_slot(conn->lnk,
smc_wr_tx_put_slot(link,
(struct smc_wr_tx_pend_priv *)pend);
goto out_unlock;
}