net/smc: dynamic allocation of CLC proposal buffer
Reduce stack size for smc_listen_work() and smc_clc_send_proposal()
by dynamic allocation of the CLC buffer to be received or sent.
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 8f6472f..00e2a4c 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -1276,10 +1276,10 @@ static void smc_listen_work(struct work_struct *work)
smc_listen_work);
struct socket *newclcsock = new_smc->clcsock;
struct smc_clc_msg_accept_confirm cclc;
+ struct smc_clc_msg_proposal_area *buf;
struct smc_clc_msg_proposal *pclc;
struct smc_init_info ini = {0};
bool ism_supported = false;
- u8 buf[SMC_CLC_MAX_LEN];
int rc = 0;
if (new_smc->listen_smc->sk.sk_state != SMC_LISTEN)
@@ -1301,8 +1301,13 @@ static void smc_listen_work(struct work_struct *work)
/* do inband token exchange -
* wait for and receive SMC Proposal CLC message
*/
- pclc = (struct smc_clc_msg_proposal *)&buf;
- rc = smc_clc_wait_msg(new_smc, pclc, SMC_CLC_MAX_LEN,
+ buf = kzalloc(sizeof(*buf), GFP_KERNEL);
+ if (!buf) {
+ rc = SMC_CLC_DECL_MEM;
+ goto out_decl;
+ }
+ pclc = (struct smc_clc_msg_proposal *)buf;
+ rc = smc_clc_wait_msg(new_smc, pclc, sizeof(*buf),
SMC_CLC_PROPOSAL, CLC_WAIT_TIME);
if (rc)
goto out_decl;
@@ -1382,6 +1387,7 @@ static void smc_listen_work(struct work_struct *work)
}
/* finish worker */
+ kfree(buf);
if (!ism_supported) {
rc = smc_listen_rdma_finish(new_smc, &cclc,
ini.first_contact_local);
@@ -1397,6 +1403,7 @@ static void smc_listen_work(struct work_struct *work)
mutex_unlock(&smc_server_lgr_pending);
out_decl:
smc_listen_decline(new_smc, rc, ini.first_contact_local);
+ kfree(buf);
}
static void smc_tcp_listen_work(struct work_struct *work)
