6.15-stable review patch. If anyone has any objections, please let me know.
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From: Stefan Metzmacher metze@samba.org
[ Upstream commit 24b6afc36db748467e853e166a385df07e443859 ]
There's no need to maintain two lists, we can just have a single list of receive buffers, which are free to use.
It just added unneeded complexity and resulted in ib_dma_unmap_single() not being called from recv_done() for empty keepalive packets.
Cc: Steve French smfrench@gmail.com Cc: Tom Talpey tom@talpey.com Cc: Long Li longli@microsoft.com Cc: linux-cifs@vger.kernel.org Cc: samba-technical@lists.samba.org Fixes: f198186aa9bb ("CIFS: SMBD: Establish SMB Direct connection") Signed-off-by: Stefan Metzmacher metze@samba.org Signed-off-by: Steve French stfrench@microsoft.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/smb/client/cifs_debug.c | 6 ++-- fs/smb/client/smbdirect.c | 62 +++----------------------------------- fs/smb/client/smbdirect.h | 4 --- 3 files changed, 7 insertions(+), 65 deletions(-)
diff --git a/fs/smb/client/cifs_debug.c b/fs/smb/client/cifs_debug.c index c0196be0e65f..9092051776fc 100644 --- a/fs/smb/client/cifs_debug.c +++ b/fs/smb/client/cifs_debug.c @@ -432,10 +432,8 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v) server->smbd_conn->receive_credit_target); seq_printf(m, "\nPending send_pending: %x ", atomic_read(&server->smbd_conn->send_pending)); - seq_printf(m, "\nReceive buffers count_receive_queue: %x " - "count_empty_packet_queue: %x", - server->smbd_conn->count_receive_queue, - server->smbd_conn->count_empty_packet_queue); + seq_printf(m, "\nReceive buffers count_receive_queue: %x ", + server->smbd_conn->count_receive_queue); seq_printf(m, "\nMR responder_resources: %x " "max_frmr_depth: %x mr_type: %x", server->smbd_conn->responder_resources, diff --git a/fs/smb/client/smbdirect.c b/fs/smb/client/smbdirect.c index e99e783f1b0e..0ab490c0a9b0 100644 --- a/fs/smb/client/smbdirect.c +++ b/fs/smb/client/smbdirect.c @@ -13,8 +13,6 @@ #include "cifsproto.h" #include "smb2proto.h"
-static struct smbd_response *get_empty_queue_buffer( - struct smbd_connection *info); static struct smbd_response *get_receive_buffer( struct smbd_connection *info); static void put_receive_buffer( @@ -23,8 +21,6 @@ static void put_receive_buffer( static int allocate_receive_buffers(struct smbd_connection *info, int num_buf); static void destroy_receive_buffers(struct smbd_connection *info);
-static void put_empty_packet( - struct smbd_connection *info, struct smbd_response *response); static void enqueue_reassembly( struct smbd_connection *info, struct smbd_response *response, int data_length); @@ -393,7 +389,6 @@ static bool process_negotiation_response( static void smbd_post_send_credits(struct work_struct *work) { int ret = 0; - int use_receive_queue = 1; int rc; struct smbd_response *response; struct smbd_connection *info = @@ -409,18 +404,9 @@ static void smbd_post_send_credits(struct work_struct *work) if (info->receive_credit_target > atomic_read(&info->receive_credits)) { while (true) { - if (use_receive_queue) - response = get_receive_buffer(info); - else - response = get_empty_queue_buffer(info); - if (!response) { - /* now switch to empty packet queue */ - if (use_receive_queue) { - use_receive_queue = 0; - continue; - } else - break; - } + response = get_receive_buffer(info); + if (!response) + break;
response->type = SMBD_TRANSFER_DATA; response->first_segment = false; @@ -511,7 +497,7 @@ static void recv_done(struct ib_cq *cq, struct ib_wc *wc) response, data_length); } else - put_empty_packet(info, response); + put_receive_buffer(info, response);
if (data_length) wake_up_interruptible(&info->wait_reassembly_queue); @@ -1115,17 +1101,6 @@ static int smbd_negotiate(struct smbd_connection *info) return rc; }
-static void put_empty_packet( - struct smbd_connection *info, struct smbd_response *response) -{ - spin_lock(&info->empty_packet_queue_lock); - list_add_tail(&response->list, &info->empty_packet_queue); - info->count_empty_packet_queue++; - spin_unlock(&info->empty_packet_queue_lock); - - queue_work(info->workqueue, &info->post_send_credits_work); -} - /* * Implement Connection.FragmentReassemblyBuffer defined in [MS-SMBD] 3.1.1.1 * This is a queue for reassembling upper layer payload and present to upper @@ -1174,25 +1149,6 @@ static struct smbd_response *_get_first_reassembly(struct smbd_connection *info) return ret; }
-static struct smbd_response *get_empty_queue_buffer( - struct smbd_connection *info) -{ - struct smbd_response *ret = NULL; - unsigned long flags; - - spin_lock_irqsave(&info->empty_packet_queue_lock, flags); - if (!list_empty(&info->empty_packet_queue)) { - ret = list_first_entry( - &info->empty_packet_queue, - struct smbd_response, list); - list_del(&ret->list); - info->count_empty_packet_queue--; - } - spin_unlock_irqrestore(&info->empty_packet_queue_lock, flags); - - return ret; -} - /* * Get a receive buffer * For each remote send, we need to post a receive. The receive buffers are @@ -1257,10 +1213,6 @@ static int allocate_receive_buffers(struct smbd_connection *info, int num_buf) spin_lock_init(&info->receive_queue_lock); info->count_receive_queue = 0;
- INIT_LIST_HEAD(&info->empty_packet_queue); - spin_lock_init(&info->empty_packet_queue_lock); - info->count_empty_packet_queue = 0; - init_waitqueue_head(&info->wait_receive_queues);
for (i = 0; i < num_buf; i++) { @@ -1294,9 +1246,6 @@ static void destroy_receive_buffers(struct smbd_connection *info)
while ((response = get_receive_buffer(info))) mempool_free(response, info->response_mempool); - - while ((response = get_empty_queue_buffer(info))) - mempool_free(response, info->response_mempool); }
/* Implement idle connection timer [MS-SMBD] 3.1.6.2 */ @@ -1383,8 +1332,7 @@ void smbd_destroy(struct TCP_Server_Info *server)
log_rdma_event(INFO, "free receive buffers\n"); wait_event(info->wait_receive_queues, - info->count_receive_queue + info->count_empty_packet_queue - == sp->recv_credit_max); + info->count_receive_queue == sp->recv_credit_max); destroy_receive_buffers(info);
/* diff --git a/fs/smb/client/smbdirect.h b/fs/smb/client/smbdirect.h index 3d552ab27e0f..fb8db71735f3 100644 --- a/fs/smb/client/smbdirect.h +++ b/fs/smb/client/smbdirect.h @@ -110,10 +110,6 @@ struct smbd_connection { int count_receive_queue; spinlock_t receive_queue_lock;
- struct list_head empty_packet_queue; - int count_empty_packet_queue; - spinlock_t empty_packet_queue_lock; - wait_queue_head_t wait_receive_queues;
/* Reassembly queue */