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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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1
net/smc/smc_cdc.h
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@@ -304,6 +304,7 @@ struct smc_cdc_tx_pend {
};
int smc_cdc_get_free_slot(struct smc_connection *conn,
struct smc_link *link,
struct smc_wr_buf **wr_buf,
struct smc_rdma_wr **wr_rdma_buf,
struct smc_cdc_tx_pend **pend);