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authorKarsten Graul <kgraul@linux.ibm.com>2020-05-04 14:18:37 +0200
committerDavid S. Miller <davem@davemloft.net>2020-05-04 10:54:39 -0700
commitf0ec4f1d32ad49a23b93156949208dd9348e3590 (patch)
tree18011695bbd3cad6e09cc2d2ed51509ca0f00d1b /net/smc
parentfc99584e9446976c1e438c2cb368010b844d0b4f (diff)
downloadlwn-f0ec4f1d32ad49a23b93156949208dd9348e3590.tar.gz
lwn-f0ec4f1d32ad49a23b93156949208dd9348e3590.zip
net/smc: save state of last sent CDC message
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>
Diffstat (limited to 'net/smc')
-rw-r--r--net/smc/smc.h4
-rw-r--r--net/smc/smc_cdc.c6
2 files changed, 10 insertions, 0 deletions
diff --git a/net/smc/smc.h b/net/smc/smc.h
index 1a084afa7372..1e9113771600 100644
--- 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 */
diff --git a/net/smc/smc_cdc.c b/net/smc/smc_cdc.c
index f64589d823aa..c5e33296e55c 100644
--- a/net/smc/smc_cdc.c
+++ b/net/smc/smc_cdc.c
@@ -47,6 +47,9 @@ 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);
@@ -104,6 +107,9 @@ 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;