[Qemu-devel] Re: eepro100.c

[Stefan Weil]

Stefan Weil schrieb:
> Jan Kiszka schrieb:
>> Michal Filka wrote:
>>> Hi,
>>>
>>> I have question on i82557b emulation in kvm.
>>>
>>> I have run a proprietary operating system (Pharlap OS) in kvm. Part
>>> of the job has been porting driver for i8255x. During the job I
>>> discovered that kvm's emulation doesn't support a RNR interrupt (it
>>> is disabled in the code).
>>>
>>> Why is it disabled? I'm running heavily loaded application and I have
>>> to poll descriptor list instead of waiting for RNR interrupt.
>> Best asked on qemu-devel, CC'ing the developer of this device model.
>>
>> Jan
>>
>
> Hi,
>
> up to now, nobody complained about the missing RNR interrupts.
> Linux obviously works without them, so I had no reason to
> implement them.
>
> The disabled code parts (function eepro100_rnr_interrupt)
> can be enabled, but you still need code which calls them
> at the right places.
>
> This should not be very difficult if there is some test case
> which proves the working RNR interrupt.
>
> Regards
> Stefan
>

Hi Michal,

could you please try the appended patch and tell me whether it works?

Regards
Stefan


>From cb12daa2f7ecbf041655825054a1661668ab7274 Mon Sep 17 00:00:00 2001
From: Stefan Weil <address@hidden>
Date: Sat, 19 Sep 2009 19:05:07 +0200
Subject: [PATCH] eepro100: Add RNR interrupt

Set RNR (receive unit not ready) interrupt for RU abort command.

Signed-off-by: Stefan Weil <address@hidden>
---
 hw/eepro100.c |   15 +++++++++++----
 1 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/hw/eepro100.c b/hw/eepro100.c
index a8f6b3f..6d49bb8 100644
--- a/hw/eepro100.c
+++ b/hw/eepro100.c
@@ -114,7 +114,7 @@
 #define  RU_NOP         0x0000
 #define  RX_START       0x0001
 #define  RX_RESUME      0x0002
-#define  RX_ABORT       0x0004
+#define  RU_ABORT       0x0004
 #define  RX_ADDR_LOAD   0x0006
 #define  RX_RESUMENR    0x0007
 #define INT_MASK        0x0100
@@ -363,13 +363,11 @@ static void eepro100_fr_interrupt(EEPRO100State * s)
     eepro100_interrupt(s, 0x40);
 }
 
-#if 0
 static void eepro100_rnr_interrupt(EEPRO100State * s)
 {
     /* RU is not ready. */
     eepro100_interrupt(s, 0x10);
 }
-#endif
 
 static void eepro100_mdi_interrupt(EEPRO100State * s)
 {
@@ -865,6 +863,13 @@ static void eepro100_ru_command(EEPRO100State * s, uint8_t 
val)
         }
         set_ru_state(s, ru_ready);
         break;
+    case RU_ABORT:
+        /* RU abort. */
+        if (get_ru_state(s) == ru_ready) {
+            eepro100_rnr_interrupt(s);
+        }
+        set_ru_state(s, ru_idle);
+        break;
     case RX_ADDR_LOAD:
         /* Load RU base. */
         TRACE(OTHER, logout("val=0x%02x (RU base address)\n", val));
@@ -872,7 +877,7 @@ static void eepro100_ru_command(EEPRO100State * s, uint8_t 
val)
         break;
     default:
         logout("val=0x%02x (undefined RU command)\n", val);
-        missing("Undefined SU command");
+        missing("Undefined RU command");
     }
 }
 
@@ -1531,6 +1536,8 @@ static ssize_t nic_receive(VLANClientState *vc, const 
uint8_t * buf, size_t size
     if (get_ru_state(s) != ru_ready) {
         /* No resources available. */
         logout("no resources, state=%u\n", get_ru_state(s));
+        /* TODO: RNR interrupt only at first failed frame? */
+        eepro100_rnr_interrupt(s);
         s->statistics.rx_resource_errors++;
         //~ assert(!"no resources");
         return -1;
-- 
1.5.6.5