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net/smc: handle unregistered buffers 

When smc_wr_reg_send() fails then tag (regerr) the affected buffer and
free it in smc_buf_unuse().

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Karsten Graul 2018-05-03 17:57:38 +02:00 committed by David S. Miller
parent e63a5f8c19
commit a6920d1d13
3 changed files with 24 additions and 5 deletions
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4
net/smc/af_smc.c
View File

@ -296,8 +296,10 @@ static void smc_copy_sock_settings_to_smc(struct smc_sock *smc)
static int smc_reg_rmb(struct smc_link *link, struct smc_buf_desc *rmb_desc)
{
/* register memory region for new rmb */
if (smc_wr_reg_send(link, rmb_desc->mr_rx[SMC_SINGLE_LINK]))
if (smc_wr_reg_send(link, rmb_desc->mr_rx[SMC_SINGLE_LINK])) {
rmb_desc->regerr = 1;
return -EFAULT;
}
return 0;
}

22
net/smc/smc_core.c
View File

@ -32,6 +32,9 @@
static u32 smc_lgr_num; /* unique link group number */
static void smc_buf_free(struct smc_buf_desc *buf_desc, struct smc_link *lnk,
bool is_rmb);
static void smc_lgr_schedule_free_work(struct smc_link_group *lgr)
{
/* client link group creation always follows the server link group
@ -234,9 +237,22 @@ static void smc_buf_unuse(struct smc_connection *conn)
conn->sndbuf_size = 0;
}
if (conn->rmb_desc) {
conn->rmb_desc->reused = true;
conn->rmb_desc->used = 0;
conn->rmbe_size = 0;
if (!conn->rmb_desc->regerr) {
conn->rmb_desc->reused = 1;
conn->rmb_desc->used = 0;
conn->rmbe_size = 0;
} else {
/* buf registration failed, reuse not possible */
struct smc_link_group *lgr = conn->lgr;
struct smc_link *lnk;
write_lock_bh(&lgr->rmbs_lock);
list_del(&conn->rmb_desc->list);
write_unlock_bh(&lgr->rmbs_lock);
lnk = &lgr->lnk[SMC_SINGLE_LINK];
smc_buf_free(conn->rmb_desc, lnk, true);
}
}
}

3
net/smc/smc_core.h
View File

@ -123,7 +123,8 @@ struct smc_buf_desc {
*/
u32 order; /* allocation order */
u32 used; /* currently used / unused */
bool reused; /* new created / reused */
u8 reused : 1; /* new created / reused */
u8 regerr : 1; /* err during registration */
};
struct smc_rtoken { /* address/key of remote RMB */