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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] [MINIOS] Implement a network frontend driver.
# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Date 1168615104 0
# Node ID 65a835dee3bc03081e6321f4756a59bf9b4f497d
# Parent 2406531dae9517fd44fe5ce5c37270a33b553074
[MINIOS] Implement a network frontend driver.
Signed-off-by: Jacob Gorm Hansen <jacobg@xxxxxxx>
---
extras/mini-os/include/netfront.h | 2
extras/mini-os/kernel.c | 11
extras/mini-os/netfront.c | 455 ++++++++++++++++++++++++++++++++++++++
3 files changed, 466 insertions(+), 2 deletions(-)
diff -r 2406531dae95 -r 65a835dee3bc extras/mini-os/include/netfront.h
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/extras/mini-os/include/netfront.h Fri Jan 12 15:18:24 2007 +0000
@@ -0,0 +1,2 @@
+void init_netfront(void*);
+void netfront_xmit(unsigned char* data,int len);
diff -r 2406531dae95 -r 65a835dee3bc extras/mini-os/kernel.c
--- a/extras/mini-os/kernel.c Fri Jan 12 15:16:05 2007 +0000
+++ b/extras/mini-os/kernel.c Fri Jan 12 15:18:24 2007 +0000
@@ -37,6 +37,7 @@
#include <sched.h>
#include <xenbus.h>
#include <gnttab.h>
+#include <netfront.h>
#include <xen/features.h>
#include <xen/version.h>
@@ -61,13 +62,13 @@ void setup_xen_features(void)
void test_xenbus(void);
-void xenbus_tester(void *p)
+static void xenbus_tester(void *p)
{
printk("Xenbus tests disabled, because of a Xend bug.\n");
/* test_xenbus(); */
}
-void periodic_thread(void *p)
+static void periodic_thread(void *p)
{
struct timeval tv;
printk("Periodic thread started.\n");
@@ -79,12 +80,18 @@ void periodic_thread(void *p)
}
}
+static void netfront_thread(void *p)
+{
+ init_netfront(&start_info);
+}
+
/* This should be overridden by the application we are linked against. */
__attribute__((weak)) int app_main(start_info_t *si)
{
printk("Dummy main: start_info=%p\n", si);
create_thread("xenbus_tester", xenbus_tester, si);
create_thread("periodic_thread", periodic_thread, si);
+ create_thread("netfront", netfront_thread, si);
return 0;
}
diff -r 2406531dae95 -r 65a835dee3bc extras/mini-os/netfront.c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/extras/mini-os/netfront.c Fri Jan 12 15:18:24 2007 +0000
@@ -0,0 +1,455 @@
+/* Minimal network driver for Mini-OS.
+ * Copyright (c) 2006-2007 Jacob Gorm Hansen, University of Copenhagen.
+ * Based on netfront.c from Xen Linux.
+ *
+ * Does not handle fragments or extras.
+ */
+
+#include <os.h>
+#include <xenbus.h>
+#include <events.h>
+#include <errno.h>
+#include <xen/io/netif.h>
+#include <gnttab.h>
+#include <xmalloc.h>
+#include <time.h>
+
+void init_rx_buffers(void);
+
+struct net_info {
+ struct netif_tx_front_ring tx;
+ struct netif_rx_front_ring rx;
+ int tx_ring_ref;
+ int rx_ring_ref;
+ unsigned int evtchn, local_port;
+
+} net_info;
+
+
+char* xenbus_printf(xenbus_transaction_t xbt,
+ char* node,char* path,
+ char* fmt,unsigned int arg)
+{
+ char fullpath[256];
+ char val[256];
+
+ sprintf(fullpath,"%s/%s",node,path);
+ sprintf(val,fmt,arg);
+ xenbus_write(xbt,fullpath,val);
+
+ return NULL;
+}
+
+
+#define NET_TX_RING_SIZE __RING_SIZE((struct netif_tx_sring *)0, PAGE_SIZE)
+#define NET_RX_RING_SIZE __RING_SIZE((struct netif_rx_sring *)0, PAGE_SIZE)
+#define GRANT_INVALID_REF 0
+
+
+unsigned short rx_freelist[NET_RX_RING_SIZE];
+unsigned short tx_freelist[NET_TX_RING_SIZE];
+
+struct net_buffer {
+ void* page;
+ int gref;
+};
+struct net_buffer rx_buffers[NET_RX_RING_SIZE];
+struct net_buffer tx_buffers[NET_TX_RING_SIZE];
+
+static inline void add_id_to_freelist(unsigned int id,unsigned short* freelist)
+{
+ freelist[id] = freelist[0];
+ freelist[0] = id;
+}
+
+static inline unsigned short get_id_from_freelist(unsigned short* freelist)
+{
+ unsigned int id = freelist[0];
+ freelist[0] = freelist[id];
+ return id;
+}
+
+__attribute__((weak)) void netif_rx(unsigned char* data,int len)
+{
+ printk("%d bytes incoming at %p\n",len,data);
+}
+
+__attribute__((weak)) void net_app_main(void*si,unsigned char*mac) {}
+
+static inline int xennet_rxidx(RING_IDX idx)
+{
+ return idx & (NET_RX_RING_SIZE - 1);
+}
+
+void network_rx(void)
+{
+ struct net_info *np = &net_info;
+ RING_IDX rp,cons;
+ struct netif_rx_response *rx;
+
+
+moretodo:
+ rp = np->rx.sring->rsp_prod;
+ rmb(); /* Ensure we see queued responses up to 'rp'. */
+ cons = np->rx.rsp_cons;
+
+ int nr_consumed=0;
+ while ((cons != rp))
+ {
+ struct net_buffer* buf;
+ unsigned char* page;
+
+ rx = RING_GET_RESPONSE(&np->rx, cons);
+
+ if (rx->flags & NETRXF_extra_info)
+ {
+ printk("+++++++++++++++++++++ we have extras!\n");
+ continue;
+ }
+
+
+ if (rx->status == NETIF_RSP_NULL) continue;
+
+ int id = rx->id;
+
+ buf = &rx_buffers[id];
+ page = (unsigned char*)buf->page;
+ gnttab_end_access(buf->gref);
+
+ if(rx->status>0)
+ {
+ netif_rx(page+rx->offset,rx->status);
+ }
+
+ add_id_to_freelist(id,rx_freelist);
+
+ nr_consumed++;
+
+ ++cons;
+ }
+ np->rx.rsp_cons=rp;
+
+ int more;
+ RING_FINAL_CHECK_FOR_RESPONSES(&np->rx,more);
+ if(more) goto moretodo;
+
+ RING_IDX req_prod = np->rx.req_prod_pvt;
+
+ int i;
+ netif_rx_request_t *req;
+
+ for(i=0; i<nr_consumed; i++)
+ {
+ int id = xennet_rxidx(req_prod + i);
+ req = RING_GET_REQUEST(&np->rx, req_prod + i);
+ struct net_buffer* buf = &rx_buffers[id];
+ void* page = buf->page;
+
+ buf->gref = req->gref =
+ gnttab_grant_access(0,virt_to_mfn(page),0);
+
+ req->id = id;
+ }
+
+ wmb();
+
+ np->rx.req_prod_pvt = req_prod + i;
+
+ int notify;
+ RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify);
+ if (notify)
+ notify_remote_via_evtchn(np->evtchn);
+
+}
+
+void network_tx_buf_gc(void)
+{
+
+
+ RING_IDX cons, prod;
+ unsigned short id;
+ struct net_info *np = &net_info;
+
+ do {
+ prod = np->tx.sring->rsp_prod;
+ rmb(); /* Ensure we see responses up to 'rp'. */
+
+ for (cons = np->tx.rsp_cons; cons != prod; cons++)
+ {
+ struct netif_tx_response *txrsp;
+
+ txrsp = RING_GET_RESPONSE(&np->tx, cons);
+ if (txrsp->status == NETIF_RSP_NULL)
+ continue;
+
+ id = txrsp->id;
+ struct net_buffer* buf = &tx_buffers[id];
+ gnttab_end_access(buf->gref);
+ buf->gref=GRANT_INVALID_REF;
+
+ add_id_to_freelist(id,tx_freelist);
+ }
+
+ np->tx.rsp_cons = prod;
+
+ /*
+ * Set a new event, then check for race with update of tx_cons.
+ * Note that it is essential to schedule a callback, no matter
+ * how few tx_buffers are pending. Even if there is space in the
+ * transmit ring, higher layers may be blocked because too much
+ * data is outstanding: in such cases notification from Xen is
+ * likely to be the only kick that we'll get.
+ */
+ np->tx.sring->rsp_event =
+ prod + ((np->tx.sring->req_prod - prod) >> 1) + 1;
+ mb();
+ } while ((cons == prod) && (prod != np->tx.sring->rsp_prod));
+
+
+}
+
+void netfront_handler(evtchn_port_t port, struct pt_regs *regs, void *data)
+{
+ int flags;
+
+ local_irq_save(flags);
+
+ network_tx_buf_gc();
+ network_rx();
+
+ local_irq_restore(flags);
+}
+
+char* backend;
+
+void init_netfront(void* si)
+{
+ xenbus_transaction_t xbt;
+ struct net_info* info = &net_info;
+ char* err;
+ char* message=NULL;
+ char nodename[] = "device/vif/0";
+ struct netif_tx_sring *txs;
+ struct netif_rx_sring *rxs;
+ int retry=0;
+ int i;
+ char* mac;
+ char* msg;
+
+ printk("************************ NETFRONT **********\n\n\n");
+
+ for(i=0;i<NET_TX_RING_SIZE;i++)
+ {
+ add_id_to_freelist(i,tx_freelist);
+ tx_buffers[i].page = (char*)alloc_page();
+ }
+
+ for(i=0;i<NET_RX_RING_SIZE;i++)
+ {
+ add_id_to_freelist(i,rx_freelist);
+ rx_buffers[i].page = (char*)alloc_page();
+ }
+
+ txs = (struct netif_tx_sring*) alloc_page();
+ rxs = (struct netif_rx_sring *) alloc_page();
+ memset(txs,0,PAGE_SIZE);
+ memset(rxs,0,PAGE_SIZE);
+
+
+ SHARED_RING_INIT(txs);
+ SHARED_RING_INIT(rxs);
+ FRONT_RING_INIT(&info->tx, txs, PAGE_SIZE);
+ FRONT_RING_INIT(&info->rx, rxs, PAGE_SIZE);
+
+ info->tx_ring_ref = gnttab_grant_access(0,virt_to_mfn(txs),0);
+ info->rx_ring_ref = gnttab_grant_access(0,virt_to_mfn(rxs),0);
+
+ evtchn_alloc_unbound_t op;
+ op.dom = DOMID_SELF;
+ op.remote_dom = 0;
+ HYPERVISOR_event_channel_op(EVTCHNOP_alloc_unbound, &op);
+ clear_evtchn(op.port); /* Without, handler gets invoked now! */
+ info->local_port = bind_evtchn(op.port, netfront_handler, NULL);
+ info->evtchn=op.port;
+
+again:
+ err = xenbus_transaction_start(&xbt);
+ if (err) {
+ printk("starting transaction\n");
+ }
+
+ err = xenbus_printf(xbt, nodename, "tx-ring-ref","%u",
+ info->tx_ring_ref);
+ if (err) {
+ message = "writing tx ring-ref";
+ goto abort_transaction;
+ }
+ err = xenbus_printf(xbt, nodename, "rx-ring-ref","%u",
+ info->rx_ring_ref);
+ if (err) {
+ message = "writing rx ring-ref";
+ goto abort_transaction;
+ }
+ err = xenbus_printf(xbt, nodename,
+ "event-channel", "%u", info->evtchn);
+ if (err) {
+ message = "writing event-channel";
+ goto abort_transaction;
+ }
+
+ err = xenbus_printf(xbt, nodename, "request-rx-copy", "%u", 1);
+
+ if (err) {
+ message = "writing request-rx-copy";
+ goto abort_transaction;
+ }
+
+ err = xenbus_printf(xbt, nodename, "state", "%u",
+ 4); /* connected */
+
+
+ err = xenbus_transaction_end(xbt, 0, &retry);
+ if (retry) {
+ goto again;
+ printk("completing transaction\n");
+ }
+
+ goto done;
+
+abort_transaction:
+ xenbus_transaction_end(xbt, 1, &retry);
+
+done:
+
+ msg = xenbus_read(XBT_NIL, "device/vif/0/backend", &backend);
+ msg = xenbus_read(XBT_NIL, "device/vif/0/mac", &mac);
+
+ printk("backend at %s\n",backend);
+ printk("mac is %s\n",mac);
+
+ char *res;
+ char path[256];
+ sprintf(path,"%s/state",backend);
+
+ xenbus_watch_path(XBT_NIL, path);
+
+ xenbus_wait_for_value(path,"4");
+
+ //free(backend);
+ free(res);
+
+ printk("**************************\n");
+
+ init_rx_buffers();
+
+ unsigned char rawmac[6];
+ sscanf(mac,"%x:%x:%x:%x:%x:%x",
+ &rawmac[0],
+ &rawmac[1],
+ &rawmac[2],
+ &rawmac[3],
+ &rawmac[4],
+ &rawmac[5]);
+
+ net_app_main(si,rawmac);
+}
+
+void shutdown_netfront(void)
+{
+ //xenbus_transaction_t xbt;
+ char* err;
+ char nodename[] = "device/vif/0";
+
+ char path[256];
+
+ printk("close network: backend at %s\n",backend);
+
+ err = xenbus_printf(XBT_NIL, nodename, "state", "%u", 6); /* closing */
+ sprintf(path,"%s/state",backend);
+
+ xenbus_wait_for_value(path,"6");
+
+ err = xenbus_printf(XBT_NIL, nodename, "state", "%u", 1);
+
+ xenbus_wait_for_value(path,"2");
+
+ unbind_all_ports();
+
+}
+
+
+void init_rx_buffers(void)
+{
+ struct net_info* np = &net_info;
+ int i, requeue_idx;
+ netif_rx_request_t *req;
+ int notify;
+
+ np->rx.req_prod_pvt = requeue_idx;
+
+
+ /* Step 2: Rebuild the RX buffer freelist and the RX ring itself. */
+ for (requeue_idx = 0, i = 0; i < NET_RX_RING_SIZE; i++)
+ {
+ struct net_buffer* buf = &rx_buffers[requeue_idx];
+ req = RING_GET_REQUEST(&np->rx, requeue_idx);
+
+ buf->gref = req->gref =
+ gnttab_grant_access(0,virt_to_mfn(buf->page),0);
+
+ req->id = requeue_idx;
+
+ requeue_idx++;
+ }
+
+ np->rx.req_prod_pvt = requeue_idx;
+
+
+
+ RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&np->rx, notify);
+
+ if(notify)
+ notify_remote_via_evtchn(np->evtchn);
+
+ np->rx.sring->rsp_event = np->rx.rsp_cons + 1;
+
+
+}
+
+
+void netfront_xmit(unsigned char* data,int len)
+{
+ int flags;
+ local_irq_save(flags);
+
+ struct net_info* info = &net_info;
+ struct netif_tx_request *tx;
+ RING_IDX i = info->tx.req_prod_pvt;
+ int notify;
+ int id = get_id_from_freelist(tx_freelist);
+ struct net_buffer* buf = &tx_buffers[id];
+ void* page = buf->page;
+
+ tx = RING_GET_REQUEST(&info->tx, i);
+
+ memcpy(page,data,len);
+
+ buf->gref =
+ tx->gref = gnttab_grant_access(0,virt_to_mfn(page),0);
+
+ tx->offset=0;
+ tx->size = len;
+ tx->flags=0;
+ tx->id = id;
+ info->tx.req_prod_pvt = i + 1;
+
+ wmb();
+
+ RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(&info->tx, notify);
+
+ if(notify) notify_remote_via_evtchn(info->evtchn);
+
+ network_tx_buf_gc();
+
+ local_irq_restore(flags);
+}
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