From: Karsten Graul <kgraul@linux.ibm.com>
Date: Mon, 4 May 2020 14:18:37 +0200
Subject: net/smc: save state of last sent CDC message
Git-commit: f0ec4f1d32ad49a23b93156949208dd9348e3590
Patch-mainline: v5.8-rc1
References: jsc#SLE-13763
When a link goes down and all connections of this link need to be
switched to an other link then the producer cursor and the sequence of
the last successfully sent CDC message must be known. Add the two fields
to the SMC connection and update it in the tx completion handler.
And to allow matching of sequences in error cases reset the seqno to the
old value in smc_cdc_msg_send() when the actual send failed.
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>
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
net/smc/smc.h | 4 ++++
net/smc/smc_cdc.c | 6 ++++++
2 files changed, 10 insertions(+)
--- a/net/smc/smc.h
+++ b/net/smc/smc.h
@@ -143,6 +143,9 @@ struct smc_connection {
* .prod cf. TCP snd_nxt
* .cons cf. TCP sends ack
*/
+ union smc_host_cursor local_tx_ctrl_fin;
+ /* prod crsr - confirmed by peer
+ */
union smc_host_cursor tx_curs_prep; /* tx - prepared data
* snd_max..wmem_alloc
*/
@@ -154,6 +157,7 @@ struct smc_connection {
*/
atomic_t sndbuf_space; /* remaining space in sndbuf */
u16 tx_cdc_seq; /* sequence # for CDC send */
+ u16 tx_cdc_seq_fin; /* sequence # - tx completed */
spinlock_t send_lock; /* protect wr_sends */
struct delayed_work tx_work; /* retry of smc_cdc_msg_send */
u32 tx_off; /* base offset in peer rmb */
--- a/net/smc/smc_cdc.c
+++ b/net/smc/smc_cdc.c
@@ -47,6 +47,9 @@ static void smc_cdc_tx_handler(struct sm
/* 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);
@@ -104,6 +107,9 @@ int smc_cdc_msg_send(struct smc_connecti
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;