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net/smc: pre-fetch send buffer outside of send_lock

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Pre-fetch send buffer for the CDC validation message before entering the
send_lock. Without that the send call might fail with -EBUSY because
there are no free buffers and waiting for buffers is not possible under
send_lock.

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
2020-05-30 16:42:37 +02:00
committed by David S. Miller
parent b86a372201
commit b8ded9de8d
3 changed files with 21 additions and 11 deletions
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10
net/smc/smc_cdc.c
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@@ -116,19 +116,15 @@ int smc_cdc_msg_send(struct smc_connection *conn,
}
/* 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)
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_tx_pend *pend;
struct smc_wr_buf *wr_buf;
struct smc_cdc_msg *peer;
int rc;
rc = smc_cdc_get_free_slot(conn, link, &wr_buf, NULL, &pend);
if (rc)
return rc;
peer = (struct smc_cdc_msg *)wr_buf;
peer->common.type = local->common.type;
peer->len = local->len;