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smb: server: remove separate empty_recvmsg_queue

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There's no need to maintain two lists, we can just
have a single list of receive buffers, which are free to use.

Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Fixes: 0626e6641f ("cifsd: add server handler for central processing and tranport layers")
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Stefan Metzmacher 2025-08-04 14:15:50 +02:00 committed by Steve French
parent e5cf61fa6e
commit 01027a62b5
1 changed files with 8 additions and 52 deletions
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60
fs/smb/server/transport_rdma.c
View File

@ -129,9 +129,6 @@ struct smb_direct_transport {
spinlock_t recvmsg_queue_lock;
struct list_head recvmsg_queue;
spinlock_t empty_recvmsg_queue_lock;
struct list_head empty_recvmsg_queue;
int send_credit_target;
atomic_t send_credits;
spinlock_t lock_new_recv_credits;
@ -276,32 +273,6 @@ static void put_recvmsg(struct smb_direct_transport *t,
spin_unlock(&t->recvmsg_queue_lock);
}
static struct
smb_direct_recvmsg *get_empty_recvmsg(struct smb_direct_transport *t)
{
struct smb_direct_recvmsg *recvmsg = NULL;
spin_lock(&t->empty_recvmsg_queue_lock);
if (!list_empty(&t->empty_recvmsg_queue)) {
recvmsg = list_first_entry(&t->empty_recvmsg_queue,
struct smb_direct_recvmsg, list);
list_del(&recvmsg->list);
}
spin_unlock(&t->empty_recvmsg_queue_lock);
return recvmsg;
}
static void put_empty_recvmsg(struct smb_direct_transport *t,
struct smb_direct_recvmsg *recvmsg)
{
ib_dma_unmap_single(t->cm_id->device, recvmsg->sge.addr,
recvmsg->sge.length, DMA_FROM_DEVICE);
spin_lock(&t->empty_recvmsg_queue_lock);
list_add_tail(&recvmsg->list, &t->empty_recvmsg_queue);
spin_unlock(&t->empty_recvmsg_queue_lock);
}
static void enqueue_reassembly(struct smb_direct_transport *t,
struct smb_direct_recvmsg *recvmsg,
int data_length)
@ -386,9 +357,6 @@ static struct smb_direct_transport *alloc_transport(struct rdma_cm_id *cm_id)
spin_lock_init(&t->recvmsg_queue_lock);
INIT_LIST_HEAD(&t->recvmsg_queue);
spin_lock_init(&t->empty_recvmsg_queue_lock);
INIT_LIST_HEAD(&t->empty_recvmsg_queue);
init_waitqueue_head(&t->wait_send_pending);
atomic_set(&t->send_pending, 0);
@ -554,7 +522,7 @@ static void recv_done(struct ib_cq *cq, struct ib_wc *wc)
wc->opcode);
smb_direct_disconnect_rdma_connection(t);
}
put_empty_recvmsg(t, recvmsg);
put_recvmsg(t, recvmsg);
return;
}
@ -568,7 +536,7 @@ static void recv_done(struct ib_cq *cq, struct ib_wc *wc)
switch (recvmsg->type) {
case SMB_DIRECT_MSG_NEGOTIATE_REQ:
if (wc->byte_len < sizeof(struct smb_direct_negotiate_req)) {
put_empty_recvmsg(t, recvmsg);
put_recvmsg(t, recvmsg);
return;
}
t->negotiation_requested = true;
@ -585,7 +553,7 @@ static void recv_done(struct ib_cq *cq, struct ib_wc *wc)
if (wc->byte_len <
offsetof(struct smb_direct_data_transfer, padding)) {
put_empty_recvmsg(t, recvmsg);
put_recvmsg(t, recvmsg);
return;
}
@ -593,7 +561,7 @@ static void recv_done(struct ib_cq *cq, struct ib_wc *wc)
if (data_length) {
if (wc->byte_len < sizeof(struct smb_direct_data_transfer) +
(u64)data_length) {
put_empty_recvmsg(t, recvmsg);
put_recvmsg(t, recvmsg);
return;
}
@ -613,7 +581,7 @@ static void recv_done(struct ib_cq *cq, struct ib_wc *wc)
avail_recvmsg_count = t->count_avail_recvmsg;
spin_unlock(&t->receive_credit_lock);
} else {
put_empty_recvmsg(t, recvmsg);
put_recvmsg(t, recvmsg);
spin_lock(&t->receive_credit_lock);
receive_credits = --(t->recv_credits);
@ -811,7 +779,6 @@ static void smb_direct_post_recv_credits(struct work_struct *work)
struct smb_direct_recvmsg *recvmsg;
int receive_credits, credits = 0;
int ret;
int use_free = 1;
spin_lock(&t->receive_credit_lock);
receive_credits = t->recv_credits;
@ -819,18 +786,9 @@ static void smb_direct_post_recv_credits(struct work_struct *work)
if (receive_credits < t->recv_credit_target) {
while (true) {
if (use_free)
recvmsg = get_free_recvmsg(t);
else
recvmsg = get_empty_recvmsg(t);
if (!recvmsg) {
if (use_free) {
use_free = 0;
continue;
} else {
break;
}
}
recvmsg = get_free_recvmsg(t);
if (!recvmsg)
break;
recvmsg->type = SMB_DIRECT_MSG_DATA_TRANSFER;
recvmsg->first_segment = false;
@ -1806,8 +1764,6 @@ static void smb_direct_destroy_pools(struct smb_direct_transport *t)
while ((recvmsg = get_free_recvmsg(t)))
mempool_free(recvmsg, t->recvmsg_mempool);
while ((recvmsg = get_empty_recvmsg(t)))
mempool_free(recvmsg, t->recvmsg_mempool);
mempool_destroy(t->recvmsg_mempool);
t->recvmsg_mempool = NULL;