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Message-Id: <20240312142743.41406-12-guwen@linux.alibaba.com>
Date: Tue, 12 Mar 2024 22:27:43 +0800
From: Wen Gu <guwen@...ux.alibaba.com>
To: wintera@...ux.ibm.com,
twinkler@...ux.ibm.com,
hca@...ux.ibm.com,
gor@...ux.ibm.com,
agordeev@...ux.ibm.com,
davem@...emloft.net,
edumazet@...gle.com,
kuba@...nel.org,
pabeni@...hat.com,
wenjia@...ux.ibm.com,
jaka@...ux.ibm.com
Cc: borntraeger@...ux.ibm.com,
svens@...ux.ibm.com,
alibuda@...ux.alibaba.com,
tonylu@...ux.alibaba.com,
guwen@...ux.alibaba.com,
linux-kernel@...r.kernel.org,
linux-s390@...r.kernel.org,
netdev@...r.kernel.org
Subject: [PATCH net-next v3 11/11] net/smc: implement DMB-merged operations of loopback-ism
This implements operations related to merging sndbuf with peer DMB in
loopback-ism. The DMB won't be freed until no sndbuf is attached to it.
Signed-off-by: Wen Gu <guwen@...ux.alibaba.com>
---
net/smc/smc_loopback.c | 123 +++++++++++++++++++++++++++++++++++------
net/smc/smc_loopback.h | 3 +
2 files changed, 109 insertions(+), 17 deletions(-)
diff --git a/net/smc/smc_loopback.c b/net/smc/smc_loopback.c
index c3e1133da8d7..202cd081c758 100644
--- a/net/smc/smc_loopback.c
+++ b/net/smc/smc_loopback.c
@@ -21,6 +21,7 @@
#if IS_ENABLED(CONFIG_SMC_LO)
#define SMC_LO_V2_CAPABLE 0x1 /* loopback-ism acts as ISMv2 */
+#define SMC_LO_SUPPORT_NOCOPY 0x1
#define SMC_DMA_ADDR_INVALID (~(dma_addr_t)0)
static const char smc_lo_dev_name[] = "loopback-ism";
@@ -82,6 +83,7 @@ static int smc_lo_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb,
goto err_node;
}
dmb_node->dma_addr = SMC_DMA_ADDR_INVALID;
+ refcount_set(&dmb_node->refcnt, 1);
again:
/* add new dmb into hash table */
@@ -95,6 +97,7 @@ static int smc_lo_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb,
}
hash_add(ldev->dmb_ht, &dmb_node->list, dmb_node->token);
write_unlock_bh(&ldev->dmb_ht_lock);
+ atomic_inc(&ldev->dmb_cnt);
dmb->sba_idx = dmb_node->sba_idx;
dmb->dmb_tok = dmb_node->token;
@@ -111,13 +114,29 @@ static int smc_lo_register_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb,
return rc;
}
+static void __smc_lo_unregister_dmb(struct smc_lo_dev *ldev,
+ struct smc_lo_dmb_node *dmb_node)
+{
+ /* remove dmb from hash table */
+ write_lock_bh(&ldev->dmb_ht_lock);
+ hash_del(&dmb_node->list);
+ write_unlock_bh(&ldev->dmb_ht_lock);
+
+ clear_bit(dmb_node->sba_idx, ldev->sba_idx_mask);
+ kvfree(dmb_node->cpu_addr);
+ kfree(dmb_node);
+
+ if (atomic_dec_and_test(&ldev->dmb_cnt))
+ wake_up(&ldev->ldev_release);
+}
+
static int smc_lo_unregister_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
{
struct smc_lo_dmb_node *dmb_node = NULL, *tmp_node;
struct smc_lo_dev *ldev = smcd->priv;
- /* remove dmb from hash table */
- write_lock_bh(&ldev->dmb_ht_lock);
+ /* find dmb from hash table */
+ read_lock_bh(&ldev->dmb_ht_lock);
hash_for_each_possible(ldev->dmb_ht, tmp_node, list, dmb->dmb_tok) {
if (tmp_node->token == dmb->dmb_tok) {
dmb_node = tmp_node;
@@ -125,16 +144,76 @@ static int smc_lo_unregister_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
}
}
if (!dmb_node) {
- write_unlock_bh(&ldev->dmb_ht_lock);
+ read_unlock_bh(&ldev->dmb_ht_lock);
return -EINVAL;
}
- hash_del(&dmb_node->list);
- write_unlock_bh(&ldev->dmb_ht_lock);
+ read_unlock_bh(&ldev->dmb_ht_lock);
- clear_bit(dmb_node->sba_idx, ldev->sba_idx_mask);
- kfree(dmb_node->cpu_addr);
- kfree(dmb_node);
+ if (refcount_dec_and_test(&dmb_node->refcnt))
+ __smc_lo_unregister_dmb(ldev, dmb_node);
+ return 0;
+}
+
+static int smc_lo_support_dmb_nocopy(struct smcd_dev *smcd)
+{
+ return SMC_LO_SUPPORT_NOCOPY;
+}
+
+static int smc_lo_attach_dmb(struct smcd_dev *smcd, struct smcd_dmb *dmb)
+{
+ struct smc_lo_dmb_node *dmb_node = NULL, *tmp_node;
+ struct smc_lo_dev *ldev = smcd->priv;
+ /* find dmb_node according to dmb->dmb_tok */
+ read_lock_bh(&ldev->dmb_ht_lock);
+ hash_for_each_possible(ldev->dmb_ht, tmp_node, list, dmb->dmb_tok) {
+ if (tmp_node->token == dmb->dmb_tok) {
+ dmb_node = tmp_node;
+ break;
+ }
+ }
+ if (!dmb_node) {
+ read_unlock_bh(&ldev->dmb_ht_lock);
+ return -EINVAL;
+ }
+ read_unlock_bh(&ldev->dmb_ht_lock);
+
+ if (!refcount_inc_not_zero(&dmb_node->refcnt))
+ /* the dmb is being unregistered, but has
+ * not been removed from the hash table.
+ */
+ return -EINVAL;
+
+ /* provide dmb information */
+ dmb->sba_idx = dmb_node->sba_idx;
+ dmb->dmb_tok = dmb_node->token;
+ dmb->cpu_addr = dmb_node->cpu_addr;
+ dmb->dma_addr = dmb_node->dma_addr;
+ dmb->dmb_len = dmb_node->len;
+ return 0;
+}
+
+static int smc_lo_detach_dmb(struct smcd_dev *smcd, u64 token)
+{
+ struct smc_lo_dmb_node *dmb_node = NULL, *tmp_node;
+ struct smc_lo_dev *ldev = smcd->priv;
+
+ /* find dmb_node according to dmb->dmb_tok */
+ read_lock_bh(&ldev->dmb_ht_lock);
+ hash_for_each_possible(ldev->dmb_ht, tmp_node, list, token) {
+ if (tmp_node->token == token) {
+ dmb_node = tmp_node;
+ break;
+ }
+ }
+ if (!dmb_node) {
+ read_unlock_bh(&ldev->dmb_ht_lock);
+ return -EINVAL;
+ }
+ read_unlock_bh(&ldev->dmb_ht_lock);
+
+ if (refcount_dec_and_test(&dmb_node->refcnt))
+ __smc_lo_unregister_dmb(ldev, dmb_node);
return 0;
}
@@ -170,6 +249,13 @@ static int smc_lo_move_data(struct smcd_dev *smcd, u64 dmb_tok,
{
struct smc_lo_dmb_node *rmb_node = NULL, *tmp_node;
struct smc_lo_dev *ldev = smcd->priv;
+ struct smc_connection *conn;
+
+ if (!sf)
+ /* since sndbuf is merged with peer DMB, there is
+ * no need to copy data from sndbuf to peer DMB.
+ */
+ return 0;
read_lock_bh(&ldev->dmb_ht_lock);
hash_for_each_possible(ldev->dmb_ht, tmp_node, list, dmb_tok) {
@@ -186,15 +272,10 @@ static int smc_lo_move_data(struct smcd_dev *smcd, u64 dmb_tok,
memcpy((char *)rmb_node->cpu_addr + offset, data, size);
- if (sf) {
- struct smc_connection *conn =
- smcd->conn[rmb_node->sba_idx];
-
- if (conn && !conn->killed)
- tasklet_schedule(&conn->rx_tsklet);
- else
- return -EPIPE;
- }
+ conn = smcd->conn[rmb_node->sba_idx];
+ if (!conn || conn->killed)
+ return -EPIPE;
+ tasklet_schedule(&conn->rx_tsklet);
return 0;
}
@@ -226,6 +307,9 @@ static const struct smcd_ops lo_ops = {
.query_remote_gid = smc_lo_query_rgid,
.register_dmb = smc_lo_register_dmb,
.unregister_dmb = smc_lo_unregister_dmb,
+ .support_dmb_nocopy = smc_lo_support_dmb_nocopy,
+ .attach_dmb = smc_lo_attach_dmb,
+ .detach_dmb = smc_lo_detach_dmb,
.add_vlan_id = smc_lo_add_vlan_id,
.del_vlan_id = smc_lo_del_vlan_id,
.set_vlan_required = smc_lo_set_vlan_required,
@@ -304,12 +388,17 @@ static int smc_lo_dev_init(struct smc_lo_dev *ldev)
smc_lo_generate_id(ldev);
rwlock_init(&ldev->dmb_ht_lock);
hash_init(ldev->dmb_ht);
+ atomic_set(&ldev->dmb_cnt, 0);
+ init_waitqueue_head(&ldev->ldev_release);
+
return smcd_lo_register_dev(ldev);
}
static void smc_lo_dev_exit(struct smc_lo_dev *ldev)
{
smcd_lo_unregister_dev(ldev);
+ if (atomic_read(&ldev->dmb_cnt))
+ wait_event(ldev->ldev_release, !atomic_read(&ldev->dmb_cnt));
}
static void smc_lo_dev_release(struct device *dev)
diff --git a/net/smc/smc_loopback.h b/net/smc/smc_loopback.h
index 24ab9d747613..9156a6c37e65 100644
--- a/net/smc/smc_loopback.h
+++ b/net/smc/smc_loopback.h
@@ -30,6 +30,7 @@ struct smc_lo_dmb_node {
u32 sba_idx;
void *cpu_addr;
dma_addr_t dma_addr;
+ refcount_t refcnt;
};
struct smc_lo_dev {
@@ -37,9 +38,11 @@ struct smc_lo_dev {
struct device dev;
u16 chid;
struct smcd_gid local_gid;
+ atomic_t dmb_cnt;
rwlock_t dmb_ht_lock;
DECLARE_BITMAP(sba_idx_mask, SMC_LO_MAX_DMBS);
DECLARE_HASHTABLE(dmb_ht, SMC_LO_DMBS_HASH_BITS);
+ wait_queue_head_t ldev_release;
};
#endif
--
2.32.0.3.g01195cf9f
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