Changeset 8136102 in mainline for uspace/lib/net/netif/netif_skel.c

Timestamp:

2011-01-11T01:33:58Z (13 years ago)

Author:

Martin Decky <martin@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

6b22c97

Parents:

6643a19 (diff), 7300c37 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

improve correctness of the NE2000 driver w.r.t. parallelism of the interrupt notification handler

• by masking off interrupts in the kernel interrupt handler, the core of the interrupt notification handler (fetching frames from the network card itself) always runs single-threaded (thus avoiding the issues with fetching of frames multiple times from different fibrils, causing ICMP replies to be duplicated)
• the received frames are buffered locally and then sent to the NIL module with the interrupts unmasked again (thus another notification handler will be scheduled if the sending of the frames to the NIL module blocks)

there is still a synchronization issue without any clear root cause when the network card is flood-pinged even before it is being initialized

File:

• uspace/lib/net/netif/netif_skel.c (modified) (2 diffs)

uspace/lib/net/netif/netif_skel.c

@@ -130 +130 @@
         if (result > NETIF_NULL) {
                 int phone = device->nil_phone;
+                nil_device_state_msg(phone, device_id, result);
                 fibril_rwlock_write_unlock(&netif_globals.lock);
-                nil_device_state_msg(phone, device_id, result);
                 return EOK;
         }
@@ -166 +166 @@
         if (result > NETIF_NULL) {
                 int phone = device->nil_phone;
+                nil_device_state_msg(phone, device_id, result);
                 fibril_rwlock_write_unlock(&netif_globals.lock);
-                nil_device_state_msg(phone, device_id, result);
                 return EOK;
         }