doc, net: Update documentation of synchronisation for TX multiqueue
Commits e308a5d806c852f56590ffdd3834d0df0cbed8d7 ('netdev: Add
netdev->addr_list_lock protection.') and
e8a0464cc950972824e2e128028ae3db666ec1ed ('netdev: Allocate multiple
queues for TX.') introduced more fine-grained locks.
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/Documentation/networking/netdevices.txt b/Documentation/networking/netdevices.txt
index 336fe8e..b107733 100644
--- a/Documentation/networking/netdevices.txt
+++ b/Documentation/networking/netdevices.txt
@@ -65,7 +65,7 @@
Context: nominally process, but don't sleep inside an rwlock
dev->hard_start_xmit:
- Synchronization: netif_tx_lock spinlock.
+ Synchronization: __netif_tx_lock spinlock.
When the driver sets NETIF_F_LLTX in dev->features this will be
called without holding netif_tx_lock. In this case the driver
@@ -87,12 +87,12 @@
Only valid when NETIF_F_LLTX is set.
dev->tx_timeout:
- Synchronization: netif_tx_lock spinlock.
+ Synchronization: netif_tx_lock spinlock; all TX queues frozen.
Context: BHs disabled
Notes: netif_queue_stopped() is guaranteed true
dev->set_rx_mode:
- Synchronization: netif_tx_lock spinlock.
+ Synchronization: netif_addr_lock spinlock.
Context: BHs disabled
struct napi_struct synchronization rules