Commit f0ec4f1d authored by Karsten Graul's avatar Karsten Graul Committed by David S. Miller

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: 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 fc99584e
......@@ -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 */
......
......@@ -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;
......
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