firewire: net: replace lists by counters

The current transmit code does not at all make use of
  - fwnet_device.packet_list
and only very limited use of
  - fwnet_device.broadcasted_list,
  - fwnet_device.queued_packets.
Their current function is to track whether the TX soft-IRQ finished
dealing with an skb when the AT-req tasklet takes over, and to discard
pending tx datagrams (if there are any) when the local node is removed.

The latter does actually contain a race condition bug with TX soft-IRQ
and AT-req tasklet.

Instead of these lists and the corresponding link in fwnet_packet_task,
  - a flag in fwnet_packet_task to track whether fwnet_tx is done,
  - a counter of queued datagrams in fwnet_device
do the job as well.

The above mentioned theoretic race condition is resolved by letting
fwnet_remove sleep until all datagrams were flushed.  It may sleep
almost arbitrarily long since fwnet_remove is executed in the context of
a multithreaded (concurrency managed) workqueue.

The type of max_payload is changed to u16 here to avoid waste in struct
fwnet_packet_task.  This value cannot exceed 4096 per IEEE 1394:2008
table 16-18 (or 32678 per specification of packet headers, if there is
ever going to be something else than beta mode).

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 26 insertions, 47 deletions

diff --git a/drivers/firewire/net.c b/drivers/firewire/net.c
index 3a27cee5bf2..d2d488b9cd9 100644
--- a/drivers/firewire/net.c
+++ b/drivers/firewire/net.c
@@ -7,6 +7,7 @@
  */
 
 #include <linux/bug.h>
+#include <linux/delay.h>
 #include <linux/device.h>
 #include <linux/firewire.h>
 #include <linux/firewire-constants.h>
@@ -169,15 +170,8 @@ struct fwnet_device {
         struct fw_address_handler handler;
         u64 local_fifo;
 
-        /* List of packets to be sent */
-        struct list_head packet_list;
-        /*
-         * List of packets that were broadcasted.  When we get an ISO interrupt
-         * one of them has been sent
-         */
-        struct list_head broadcasted_list;
-        /* List of packets that have been sent but not yet acked */
-        struct list_head sent_list;
+        /* Number of tx datagrams that have been queued but not yet acked */
+        int queued_datagrams;
 
         struct list_head peer_list;
         struct fw_card *card;
@@ -195,7 +189,7 @@ struct fwnet_peer {
         unsigned pdg_size;        /* pd_list size */
 
         u16 datagram_label;       /* outgoing datagram label */
-        unsigned max_payload;     /* includes RFC2374_FRAG_HDR_SIZE overhead */
+        u16 max_payload;          /* includes RFC2374_FRAG_HDR_SIZE overhead */
         int node_id;
         int generation;
         unsigned speed;
@@ -203,22 +197,18 @@ struct fwnet_peer {
 
 /* This is our task struct. It's used for the packet complete callback.  */
 struct fwnet_packet_task {
-        /*
-         * ptask can actually be on dev->packet_list, dev->broadcasted_list,
-         * or dev->sent_list depending on its current state.
-         */
-        struct list_head pt_link;
         struct fw_transaction transaction;
         struct rfc2734_header hdr;
         struct sk_buff *skb;
         struct fwnet_device *dev;
 
         int outstanding_pkts;
-        unsigned max_payload;
         u64 fifo_addr;
         u16 dest_node;
+        u16 max_payload;
         u8 generation;
         u8 speed;
+        u8 enqueued;
 };
 
 /*
@@ -915,9 +905,9 @@ static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
         ptask->outstanding_pkts--;
 
         /* Check whether we or the networking TX soft-IRQ is last user. */
-        free = (ptask->outstanding_pkts == 0 && !list_empty(&ptask->pt_link));
+        free = (ptask->outstanding_pkts == 0 && ptask->enqueued);
         if (free)
-                list_del(&ptask->pt_link);
+                dev->queued_datagrams--;
 
         if (ptask->outstanding_pkts == 0) {
                 dev->netdev->stats.tx_packets++;
@@ -986,9 +976,9 @@ static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
         ptask->outstanding_pkts = 0;
 
         /* Check whether we or the networking TX soft-IRQ is last user. */
-        free = !list_empty(&ptask->pt_link);
+        free = ptask->enqueued;
         if (free)
-                list_del(&ptask->pt_link);
+                dev->queued_datagrams--;
 
         dev->netdev->stats.tx_dropped++;
         dev->netdev->stats.tx_errors++;
@@ -1069,9 +1059,11 @@ static int fwnet_send_packet(struct fwnet_packet_task *ptask)
                 spin_lock_irqsave(&dev->lock, flags);
 
                 /* If the AT tasklet already ran, we may be last user. */
-                free = (ptask->outstanding_pkts == 0 && list_empty(&ptask->pt_link));
+                free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
                 if (!free)
-                        list_add_tail(&ptask->pt_link, &dev->broadcasted_list);
+                        ptask->enqueued = true;
+                else
+                        dev->queued_datagrams--;
 
                 spin_unlock_irqrestore(&dev->lock, flags);
 
@@ -1086,9 +1078,11 @@ static int fwnet_send_packet(struct fwnet_packet_task *ptask)
         spin_lock_irqsave(&dev->lock, flags);
 
         /* If the AT tasklet already ran, we may be last user. */
-        free = (ptask->outstanding_pkts == 0 && list_empty(&ptask->pt_link));
+        free = (ptask->outstanding_pkts == 0 && !ptask->enqueued);
         if (!free)
-                list_add_tail(&ptask->pt_link, &dev->sent_list);
+                ptask->enqueued = true;
+        else
+                dev->queued_datagrams--;
 
         spin_unlock_irqrestore(&dev->lock, flags);
 
@@ -1350,10 +1344,12 @@ static netdev_tx_t fwnet_tx(struct sk_buff *skb, struct net_device *net)
                 max_payload += RFC2374_FRAG_HDR_SIZE;
         }
 
+        dev->queued_datagrams++;
+
         spin_unlock_irqrestore(&dev->lock, flags);
 
         ptask->max_payload = max_payload;
-        INIT_LIST_HEAD(&ptask->pt_link);
+        ptask->enqueued    = 0;
 
         fwnet_send_packet(ptask);
 
@@ -1487,14 +1483,9 @@ static int fwnet_probe(struct device *_dev)
         dev->broadcast_rcv_context = NULL;
         dev->broadcast_xmt_max_payload = 0;
         dev->broadcast_xmt_datagramlabel = 0;
-
         dev->local_fifo = FWNET_NO_FIFO_ADDR;
-
-        INIT_LIST_HEAD(&dev->packet_list);
-        INIT_LIST_HEAD(&dev->broadcasted_list);
-        INIT_LIST_HEAD(&dev->sent_list);
+        dev->queued_datagrams = 0;
         INIT_LIST_HEAD(&dev->peer_list);
-
         dev->card = card;
         dev->netdev = net;
 
@@ -1552,7 +1543,7 @@ static int fwnet_remove(struct device *_dev)
         struct fwnet_peer *peer = dev_get_drvdata(_dev);
         struct fwnet_device *dev = peer->dev;
         struct net_device *net;
-        struct fwnet_packet_task *ptask, *pt_next;
+        int i;
 
         mutex_lock(&fwnet_device_mutex);
 
@@ -1570,21 +1561,9 @@ static int fwnet_remove(struct device *_dev)
                                               dev->card);
                         fw_iso_context_destroy(dev->broadcast_rcv_context);
                 }
-                list_for_each_entry_safe(ptask, pt_next,
-                                         &dev->packet_list, pt_link) {
-                        dev_kfree_skb_any(ptask->skb);
-                        kmem_cache_free(fwnet_packet_task_cache, ptask);
-                }
-                list_for_each_entry_safe(ptask, pt_next,
-                                         &dev->broadcasted_list, pt_link) {
-                        dev_kfree_skb_any(ptask->skb);
-                        kmem_cache_free(fwnet_packet_task_cache, ptask);
-                }
-                list_for_each_entry_safe(ptask, pt_next,
-                                         &dev->sent_list, pt_link) {
-                        dev_kfree_skb_any(ptask->skb);
-                        kmem_cache_free(fwnet_packet_task_cache, ptask);
-                }
+                for (i = 0; dev->queued_datagrams && i < 5; i++)
+                        ssleep(1);
+                WARN_ON(dev->queued_datagrams);
                 list_del(&dev->dev_link);
 
                 free_netdev(net);