[PATCH net-next v2 02/11] net/smc: save stack space and allocate smc_init_info

Karsten Graul
2021-10-14T16:48:47Z

The struct smc_init_info grew over time, its time to save space on stack
and allocate this struct dynamically.

Signed-off-by: Karsten Graul <kgraul@linux.ibm.com>
---
net/smc/smc_llc.c | 83 ++++++++++++++++++++++++++++++-----------------
1 file changed, 53 insertions(+), 30 deletions(-)

diff --git a/net/smc/smc_llc.c b/net/smc/smc_llc.c
index 72f4b72eb175..760f5ed7c8f0 100644
--- a/net/smc/smc_llc.c
+++ b/net/smc/smc_llc.c
@@ -870,31 +870,37 @@ int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry)
struct smc_llc_msg_add_link *llc = &qentry->msg.add_link;
enum smc_lgr_type lgr_new_t = SMC_LGR_SYMMETRIC;
struct smc_link_group *lgr = smc_get_lgr(link);
+ struct smc_init_info *ini = NULL;
struct smc_link *lnk_new = NULL;
- struct smc_init_info ini;
int lnk_idx, rc = 0;

if (!llc->qp_mtu)
goto out_reject;

- ini.vlan_id = lgr->vlan_id;
- smc_pnet_find_alt_roce(lgr, &ini, link->smcibdev);
+ ini = kzalloc(sizeof(*ini), GFP_KERNEL);
+ if (!ini) {
+ rc = -ENOMEM;
+ goto out_reject;
+ }
+
+ ini->vlan_id = lgr->vlan_id;
+ smc_pnet_find_alt_roce(lgr, ini, link->smcibdev);
if (!memcmp(llc->sender_gid, link->peer_gid, SMC_GID_SIZE) &&
!memcmp(llc->sender_mac, link->peer_mac, ETH_ALEN)) {
- if (!ini.ib_dev)
+ if (!ini->ib_dev)
goto out_reject;
lgr_new_t = SMC_LGR_ASYMMETRIC_PEER;
}
- if (!ini.ib_dev) {
+ if (!ini->ib_dev) {
lgr_new_t = SMC_LGR_ASYMMETRIC_LOCAL;
- ini.ib_dev = link->smcibdev;
- ini.ib_port = link->ibport;
+ ini->ib_dev = link->smcibdev;
+ ini->ib_port = link->ibport;
}
lnk_idx = smc_llc_alloc_alt_link(lgr, lgr_new_t);
if (lnk_idx < 0)
goto out_reject;
lnk_new = &lgr->lnk[lnk_idx];
- rc = smcr_link_init(lgr, lnk_new, lnk_idx, &ini);
+ rc = smcr_link_init(lgr, lnk_new, lnk_idx, ini);
if (rc)
goto out_reject;
smc_llc_save_add_link_info(lnk_new, llc);
@@ -910,7 +916,7 @@ int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry)
goto out_clear_lnk;

rc = smc_llc_send_add_link(link,
- lnk_new->smcibdev->mac[ini.ib_port - 1],
+ lnk_new->smcibdev->mac[ini->ib_port - 1],
lnk_new->gid, lnk_new, SMC_LLC_RESP);
if (rc)
goto out_clear_lnk;
@@ -919,7 +925,7 @@ int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry)
rc = 0;
goto out_clear_lnk;
}
- rc = smc_llc_cli_conf_link(link, &ini, lnk_new, lgr_new_t);
+ rc = smc_llc_cli_conf_link(link, ini, lnk_new, lgr_new_t);
if (!rc)
goto out;
out_clear_lnk:
@@ -928,6 +934,7 @@ int smc_llc_cli_add_link(struct smc_link *link, struct smc_llc_qentry *qentry)
out_reject:
smc_llc_cli_add_link_reject(qentry);
out:
+ kfree(ini);
kfree(qentry);
return rc;
}
@@ -937,20 +944,25 @@ static void smc_llc_cli_add_link_invite(struct smc_link *link,
struct smc_llc_qentry *qentry)
{
struct smc_link_group *lgr = smc_get_lgr(link);
- struct smc_init_info ini;
+ struct smc_init_info *ini = NULL;

if (lgr->type == SMC_LGR_SYMMETRIC ||
lgr->type == SMC_LGR_ASYMMETRIC_PEER)
goto out;

- ini.vlan_id = lgr->vlan_id;
- smc_pnet_find_alt_roce(lgr, &ini, link->smcibdev);
- if (!ini.ib_dev)
+ ini = kzalloc(sizeof(*ini), GFP_KERNEL);
+ if (!ini)
+ goto out;
+
+ ini->vlan_id = lgr->vlan_id;
+ smc_pnet_find_alt_roce(lgr, ini, link->smcibdev);
+ if (!ini->ib_dev)
goto out;

- smc_llc_send_add_link(link, ini.ib_dev->mac[ini.ib_port - 1],
- ini.ib_gid, NULL, SMC_LLC_REQ);
+ smc_llc_send_add_link(link, ini->ib_dev->mac[ini->ib_port - 1],
+ ini->ib_gid, NULL, SMC_LLC_REQ);
out:
+ kfree(ini);
kfree(qentry);
}

@@ -1158,28 +1170,34 @@ int smc_llc_srv_add_link(struct smc_link *link)
struct smc_link_group *lgr = link->lgr;
struct smc_llc_msg_add_link *add_llc;
struct smc_llc_qentry *qentry = NULL;
- struct smc_link *link_new;
- struct smc_init_info ini;
+ struct smc_link *link_new = NULL;
+ struct smc_init_info *ini;
int lnk_idx, rc = 0;

+ ini = kzalloc(sizeof(*ini), GFP_KERNEL);
+ if (!ini)
+ return -ENOMEM;
+
/* ignore client add link recommendation, start new flow */
- ini.vlan_id = lgr->vlan_id;
- smc_pnet_find_alt_roce(lgr, &ini, link->smcibdev);
- if (!ini.ib_dev) {
+ ini->vlan_id = lgr->vlan_id;
+ smc_pnet_find_alt_roce(lgr, ini, link->smcibdev);
+ if (!ini->ib_dev) {
lgr_new_t = SMC_LGR_ASYMMETRIC_LOCAL;
- ini.ib_dev = link->smcibdev;
- ini.ib_port = link->ibport;
+ ini->ib_dev = link->smcibdev;
+ ini->ib_port = link->ibport;
}
lnk_idx = smc_llc_alloc_alt_link(lgr, lgr_new_t);
- if (lnk_idx < 0)
- return 0;
+ if (lnk_idx < 0) {
+ rc = 0;
+ goto out;
+ }

- rc = smcr_link_init(lgr, &lgr->lnk[lnk_idx], lnk_idx, &ini);
+ rc = smcr_link_init(lgr, &lgr->lnk[lnk_idx], lnk_idx, ini);
if (rc)
- return rc;
+ goto out;
link_new = &lgr->lnk[lnk_idx];
rc = smc_llc_send_add_link(link,
- link_new->smcibdev->mac[ini.ib_port - 1],
+ link_new->smcibdev->mac[ini->ib_port - 1],
link_new->gid, link_new, SMC_LLC_REQ);
if (rc)
goto out_err;
@@ -1218,10 +1236,15 @@ int smc_llc_srv_add_link(struct smc_link *link)
rc = smc_llc_srv_conf_link(link, link_new, lgr_new_t);
if (rc)
goto out_err;
+ kfree(ini);
return 0;
out_err:
- link_new->state = SMC_LNK_INACTIVE;
- smcr_link_clear(link_new, false);
+ if (link_new) {
+ link_new->state = SMC_LNK_INACTIVE;
+ smcr_link_clear(link_new, false);
+ }
+out:
+ kfree(ini);
return rc;
}

--
2.25.1