* - Use skb_clone(), break up processing in chunks
* - Split transport/device specific
* - Make buffer size dynamic to exert less memory pressure
- *
+ * - RX reorder support
*
* This handles the RX path.
*
* In firmware >= 1.4, RX packets have an extended header (16
* bytes). This header conveys information for management of host
* reordering of packets (the device offloads storage of the packets
- * for reordering to the host).
- *
- * Currently this information is not used as the current code doesn't
- * enable host reordering.
+ * for reordering to the host). Read below for more information.
*
* The header is used as dummy space to emulate an ethernet header and
* thus be able to act as an ethernet device without having to reallocate.
*
+ * DATA RX REORDERING
+ *
+ * Starting in firmware v1.4, the device can deliver packets for
+ * delivery with special reordering information; this allows it to
+ * more effectively do packet management when some frames were lost in
+ * the radio traffic.
+ *
+ * Thus, for RX packets that come out of order, the device gives the
+ * driver enough information to queue them properly and then at some
+ * point, the signal to deliver the whole (or part) of the queued
+ * packets to the networking stack. There are 16 such queues.
+ *
+ * This only happens when a packet comes in with the "need reorder"
+ * flag set in the RX header. When such bit is set, the following
+ * operations might be indicated:
+ *
+ * - reset queue: send all queued packets to the OS
+ *
+ * - queue: queue a packet
+ *
+ * - update ws: update the queue's window start and deliver queued
+ * packets that meet the criteria
+ *
+ * - queue & update ws: queue a packet, update the window start and
+ * deliver queued packets that meet the criteria
+ *
+ * (delivery criteria: the packet's [normalized] sequence number is
+ * lower than the new [normalized] window start).
+ *
+ * See the i2400m_roq_*() functions for details.
+ *
* ROADMAP
*
* i2400m_rx
* i2400m_net_rx
* i2400m_rx_edata
* i2400m_net_erx
+ * i2400m_roq_reset
+ * i2400m_net_erx
+ * i2400m_roq_queue
+ * __i2400m_roq_queue
+ * i2400m_roq_update_ws
+ * __i2400m_roq_update_ws
+ * i2400m_net_erx
+ * i2400m_roq_queue_update_ws
+ * __i2400m_roq_queue
+ * __i2400m_roq_update_ws
+ * i2400m_net_erx
* i2400m_rx_ctl
* i2400m_msg_size_check
* i2400m_report_hook_work [in a workqueue]
struct i2400m_work *iw =
container_of(ws, struct i2400m_work, ws);
struct i2400m_report_hook_args *args = (void *) iw->pl;
- i2400m_report_hook(iw->i2400m, args->l3l4_hdr, args->size);
+ if (iw->i2400m->ready)
+ i2400m_report_hook(iw->i2400m, args->l3l4_hdr, args->size);
kfree_skb(args->skb_rx);
i2400m_put(iw->i2400m);
kfree(iw);
skb_get(skb_rx);
i2400m_queue_work(i2400m, i2400m_report_hook_work,
GFP_KERNEL, &args, sizeof(args));
+ if (unlikely(i2400m->trace_msg_from_user))
+ wimax_msg(&i2400m->wimax_dev, "echo",
+ l3l4_hdr, size, GFP_KERNEL);
result = wimax_msg(&i2400m->wimax_dev, NULL, l3l4_hdr, size,
GFP_KERNEL);
if (result < 0)
return;
}
+
+/*
+ * Reorder queue data stored on skb->cb while the skb is queued in the
+ * reorder queues.
+ */
+struct i2400m_roq_data {
+ unsigned sn; /* Serial number for the skb */
+ enum i2400m_cs cs; /* packet type for the skb */
+};
+
+
+/*
+ * ReOrder Queue
+ *
+ * @ws: Window Start; sequence number where the current window start
+ * is for this queue
+ * @queue: the skb queue itself
+ * @log: circular ring buffer used to log information about the
+ * reorder process in this queue that can be displayed in case of
+ * error to help diagnose it.
+ *
+ * This is the head for a list of skbs. In the skb->cb member of the
+ * skb when queued here contains a 'struct i2400m_roq_data' were we
+ * store the sequence number (sn) and the cs (packet type) coming from
+ * the RX payload header from the device.
+ */
+struct i2400m_roq
+{
+ unsigned ws;
+ struct sk_buff_head queue;
+ struct i2400m_roq_log *log;
+};
+
+
+static
+void __i2400m_roq_init(struct i2400m_roq *roq)
+{
+ roq->ws = 0;
+ skb_queue_head_init(&roq->queue);
+}
+
+
+static
+unsigned __i2400m_roq_index(struct i2400m *i2400m, struct i2400m_roq *roq)
+{
+ return ((unsigned long) roq - (unsigned long) i2400m->rx_roq)
+ / sizeof(*roq);
+}
+
+
+/*
+ * Normalize a sequence number based on the queue's window start
+ *
+ * nsn = (sn - ws) % 2048
+ *
+ * Note that if @sn < @roq->ws, we still need a positive number; %'s
+ * sign is implementation specific, so we normalize it by adding 2048
+ * to bring it to be positive.
+ */
+static
+unsigned __i2400m_roq_nsn(struct i2400m_roq *roq, unsigned sn)
+{
+ int r;
+ r = ((int) sn - (int) roq->ws) % 2048;
+ if (r < 0)
+ r += 2048;
+ return r;
+}
+
+
+/*
+ * Circular buffer to keep the last N reorder operations
+ *
+ * In case something fails, dumb then to try to come up with what
+ * happened.
+ */
+enum {
+ I2400M_ROQ_LOG_LENGTH = 32,
+};
+
+struct i2400m_roq_log {
+ struct i2400m_roq_log_entry {
+ enum i2400m_ro_type type;
+ unsigned ws, count, sn, nsn, new_ws;
+ } entry[I2400M_ROQ_LOG_LENGTH];
+ unsigned in, out;
+};
+
+
+/* Print a log entry */
+static
+void i2400m_roq_log_entry_print(struct i2400m *i2400m, unsigned index,
+ unsigned e_index,
+ struct i2400m_roq_log_entry *e)
+{
+ struct device *dev = i2400m_dev(i2400m);
+
+ switch(e->type) {
+ case I2400M_RO_TYPE_RESET:
+ dev_err(dev, "q#%d reset ws %u cnt %u sn %u/%u"
+ " - new nws %u\n",
+ index, e->ws, e->count, e->sn, e->nsn, e->new_ws);
+ break;
+ case I2400M_RO_TYPE_PACKET:
+ dev_err(dev, "q#%d queue ws %u cnt %u sn %u/%u\n",
+ index, e->ws, e->count, e->sn, e->nsn);
+ break;
+ case I2400M_RO_TYPE_WS:
+ dev_err(dev, "q#%d update_ws ws %u cnt %u sn %u/%u"
+ " - new nws %u\n",
+ index, e->ws, e->count, e->sn, e->nsn, e->new_ws);
+ break;
+ case I2400M_RO_TYPE_PACKET_WS:
+ dev_err(dev, "q#%d queue_update_ws ws %u cnt %u sn %u/%u"
+ " - new nws %u\n",
+ index, e->ws, e->count, e->sn, e->nsn, e->new_ws);
+ break;
+ default:
+ dev_err(dev, "q#%d BUG? entry %u - unknown type %u\n",
+ index, e_index, e->type);
+ break;
+ }
+}
+
+
+static
+void i2400m_roq_log_add(struct i2400m *i2400m,
+ struct i2400m_roq *roq, enum i2400m_ro_type type,
+ unsigned ws, unsigned count, unsigned sn,
+ unsigned nsn, unsigned new_ws)
+{
+ struct i2400m_roq_log_entry *e;
+ unsigned cnt_idx;
+ int index = __i2400m_roq_index(i2400m, roq);
+
+ /* if we run out of space, we eat from the end */
+ if (roq->log->in - roq->log->out == I2400M_ROQ_LOG_LENGTH)
+ roq->log->out++;
+ cnt_idx = roq->log->in++ % I2400M_ROQ_LOG_LENGTH;
+ e = &roq->log->entry[cnt_idx];
+
+ e->type = type;
+ e->ws = ws;
+ e->count = count;
+ e->sn = sn;
+ e->nsn = nsn;
+ e->new_ws = new_ws;
+
+ if (d_test(1))
+ i2400m_roq_log_entry_print(i2400m, index, cnt_idx, e);
+}
+
+
+/* Dump all the entries in the FIFO and reinitialize it */
+static
+void i2400m_roq_log_dump(struct i2400m *i2400m, struct i2400m_roq *roq)
+{
+ unsigned cnt, cnt_idx;
+ struct i2400m_roq_log_entry *e;
+ int index = __i2400m_roq_index(i2400m, roq);
+
+ BUG_ON(roq->log->out > roq->log->in);
+ for (cnt = roq->log->out; cnt < roq->log->in; cnt++) {
+ cnt_idx = cnt % I2400M_ROQ_LOG_LENGTH;
+ e = &roq->log->entry[cnt_idx];
+ i2400m_roq_log_entry_print(i2400m, index, cnt_idx, e);
+ memset(e, 0, sizeof(*e));
+ }
+ roq->log->in = roq->log->out = 0;
+}
+
+
+/*
+ * Backbone for the queuing of an skb (by normalized sequence number)
+ *
+ * @i2400m: device descriptor
+ * @roq: reorder queue where to add
+ * @skb: the skb to add
+ * @sn: the sequence number of the skb
+ * @nsn: the normalized sequence number of the skb (pre-computed by the
+ * caller from the @sn and @roq->ws).
+ *
+ * We try first a couple of quick cases:
+ *
+ * - the queue is empty
+ * - the skb would be appended to the queue
+ *
+ * These will be the most common operations.
+ *
+ * If these fail, then we have to do a sorted insertion in the queue,
+ * which is the slowest path.
+ *
+ * We don't have to acquire a reference count as we are going to own it.
+ */
+static
+void __i2400m_roq_queue(struct i2400m *i2400m, struct i2400m_roq *roq,
+ struct sk_buff *skb, unsigned sn, unsigned nsn)
+{
+ struct device *dev = i2400m_dev(i2400m);
+ struct sk_buff *skb_itr;
+ struct i2400m_roq_data *roq_data_itr, *roq_data;
+ unsigned nsn_itr;
+
+ d_fnstart(4, dev, "(i2400m %p roq %p skb %p sn %u nsn %u)\n",
+ i2400m, roq, skb, sn, nsn);
+
+ roq_data = (struct i2400m_roq_data *) &skb->cb;
+ BUILD_BUG_ON(sizeof(*roq_data) > sizeof(skb->cb));
+ roq_data->sn = sn;
+ d_printf(3, dev, "ERX: roq %p [ws %u] nsn %d sn %u\n",
+ roq, roq->ws, nsn, roq_data->sn);
+
+ /* Queues will be empty on not-so-bad environments, so try
+ * that first */
+ if (skb_queue_empty(&roq->queue)) {
+ d_printf(2, dev, "ERX: roq %p - first one\n", roq);
+ __skb_queue_head(&roq->queue, skb);
+ goto out;
+ }
+ /* Now try append, as most of the operations will be that */
+ skb_itr = skb_peek_tail(&roq->queue);
+ roq_data_itr = (struct i2400m_roq_data *) &skb_itr->cb;
+ nsn_itr = __i2400m_roq_nsn(roq, roq_data_itr->sn);
+ /* NSN bounds assumed correct (checked when it was queued) */
+ if (nsn >= nsn_itr) {
+ d_printf(2, dev, "ERX: roq %p - appended after %p (nsn %d sn %u)\n",
+ roq, skb_itr, nsn_itr, roq_data_itr->sn);
+ __skb_queue_tail(&roq->queue, skb);
+ goto out;
+ }
+ /* None of the fast paths option worked. Iterate to find the
+ * right spot where to insert the packet; we know the queue is
+ * not empty, so we are not the first ones; we also know we
+ * are not going to be the last ones. The list is sorted, so
+ * we have to insert before the the first guy with an nsn_itr
+ * greater that our nsn. */
+ skb_queue_walk(&roq->queue, skb_itr) {
+ roq_data_itr = (struct i2400m_roq_data *) &skb_itr->cb;
+ nsn_itr = __i2400m_roq_nsn(roq, roq_data_itr->sn);
+ /* NSN bounds assumed correct (checked when it was queued) */
+ if (nsn_itr > nsn) {
+ d_printf(2, dev, "ERX: roq %p - queued before %p "
+ "(nsn %d sn %u)\n", roq, skb_itr, nsn_itr,
+ roq_data_itr->sn);
+ __skb_queue_before(&roq->queue, skb_itr, skb);
+ goto out;
+ }
+ }
+ /* If we get here, that is VERY bad -- print info to help
+ * diagnose and crash it */
+ dev_err(dev, "SW BUG? failed to insert packet\n");
+ dev_err(dev, "ERX: roq %p [ws %u] skb %p nsn %d sn %u\n",
+ roq, roq->ws, skb, nsn, roq_data->sn);
+ skb_queue_walk(&roq->queue, skb_itr) {
+ roq_data_itr = (struct i2400m_roq_data *) &skb_itr->cb;
+ nsn_itr = __i2400m_roq_nsn(roq, roq_data_itr->sn);
+ /* NSN bounds assumed correct (checked when it was queued) */
+ dev_err(dev, "ERX: roq %p skb_itr %p nsn %d sn %u\n",
+ roq, skb_itr, nsn_itr, roq_data_itr->sn);
+ }
+ BUG();
+out:
+ d_fnend(4, dev, "(i2400m %p roq %p skb %p sn %u nsn %d) = void\n",
+ i2400m, roq, skb, sn, nsn);
+ return;
+}
+
+
+/*
+ * Backbone for the update window start operation
+ *
+ * @i2400m: device descriptor
+ * @roq: Reorder queue
+ * @sn: New sequence number
+ *
+ * Updates the window start of a queue; when doing so, it must deliver
+ * to the networking stack all the queued skb's whose normalized
+ * sequence number is lower than the new normalized window start.
+ */
+static
+unsigned __i2400m_roq_update_ws(struct i2400m *i2400m, struct i2400m_roq *roq,
+ unsigned sn)
+{
+ struct device *dev = i2400m_dev(i2400m);
+ struct sk_buff *skb_itr, *tmp_itr;
+ struct i2400m_roq_data *roq_data_itr;
+ unsigned new_nws, nsn_itr;
+
+ new_nws = __i2400m_roq_nsn(roq, sn);
+ if (unlikely(new_nws >= 1024) && d_test(1)) {
+ dev_err(dev, "SW BUG? __update_ws new_nws %u (sn %u ws %u)\n",
+ new_nws, sn, roq->ws);
+ WARN_ON(1);
+ i2400m_roq_log_dump(i2400m, roq);
+ }
+ skb_queue_walk_safe(&roq->queue, skb_itr, tmp_itr) {
+ roq_data_itr = (struct i2400m_roq_data *) &skb_itr->cb;
+ nsn_itr = __i2400m_roq_nsn(roq, roq_data_itr->sn);
+ /* NSN bounds assumed correct (checked when it was queued) */
+ if (nsn_itr < new_nws) {
+ d_printf(2, dev, "ERX: roq %p - release skb %p "
+ "(nsn %u/%u new nws %u)\n",
+ roq, skb_itr, nsn_itr, roq_data_itr->sn,
+ new_nws);
+ __skb_unlink(skb_itr, &roq->queue);
+ i2400m_net_erx(i2400m, skb_itr, roq_data_itr->cs);
+ }
+ else
+ break; /* rest of packets all nsn_itr > nws */
+ }
+ roq->ws = sn;
+ return new_nws;
+}
+
+
+/*
+ * Reset a queue
+ *
+ * @i2400m: device descriptor
+ * @cin: Queue Index
+ *
+ * Deliver all the packets and reset the window-start to zero. Name is
+ * kind of misleading.
+ */
+static
+void i2400m_roq_reset(struct i2400m *i2400m, struct i2400m_roq *roq)
+{
+ struct device *dev = i2400m_dev(i2400m);
+ struct sk_buff *skb_itr, *tmp_itr;
+ struct i2400m_roq_data *roq_data_itr;
+
+ d_fnstart(2, dev, "(i2400m %p roq %p)\n", i2400m, roq);
+ i2400m_roq_log_add(i2400m, roq, I2400M_RO_TYPE_RESET,
+ roq->ws, skb_queue_len(&roq->queue),
+ ~0, ~0, 0);
+ skb_queue_walk_safe(&roq->queue, skb_itr, tmp_itr) {
+ roq_data_itr = (struct i2400m_roq_data *) &skb_itr->cb;
+ d_printf(2, dev, "ERX: roq %p - release skb %p (sn %u)\n",
+ roq, skb_itr, roq_data_itr->sn);
+ __skb_unlink(skb_itr, &roq->queue);
+ i2400m_net_erx(i2400m, skb_itr, roq_data_itr->cs);
+ }
+ roq->ws = 0;
+ d_fnend(2, dev, "(i2400m %p roq %p) = void\n", i2400m, roq);
+ return;
+}
+
+
+/*
+ * Queue a packet
+ *
+ * @i2400m: device descriptor
+ * @cin: Queue Index
+ * @skb: containing the packet data
+ * @fbn: First block number of the packet in @skb
+ * @lbn: Last block number of the packet in @skb
+ *
+ * The hardware is asking the driver to queue a packet for later
+ * delivery to the networking stack.
+ */
+static
+void i2400m_roq_queue(struct i2400m *i2400m, struct i2400m_roq *roq,
+ struct sk_buff * skb, unsigned lbn)
+{
+ struct device *dev = i2400m_dev(i2400m);
+ unsigned nsn, len;
+
+ d_fnstart(2, dev, "(i2400m %p roq %p skb %p lbn %u) = void\n",
+ i2400m, roq, skb, lbn);
+ len = skb_queue_len(&roq->queue);
+ nsn = __i2400m_roq_nsn(roq, lbn);
+ if (unlikely(nsn >= 1024)) {
+ dev_err(dev, "SW BUG? queue nsn %d (lbn %u ws %u)\n",
+ nsn, lbn, roq->ws);
+ i2400m_roq_log_dump(i2400m, roq);
+ i2400m->bus_reset(i2400m, I2400M_RT_WARM);
+ } else {
+ __i2400m_roq_queue(i2400m, roq, skb, lbn, nsn);
+ i2400m_roq_log_add(i2400m, roq, I2400M_RO_TYPE_PACKET,
+ roq->ws, len, lbn, nsn, ~0);
+ }
+ d_fnend(2, dev, "(i2400m %p roq %p skb %p lbn %u) = void\n",
+ i2400m, roq, skb, lbn);
+ return;
+}
+
+
+/*
+ * Update the window start in a reorder queue and deliver all skbs
+ * with a lower window start
+ *
+ * @i2400m: device descriptor
+ * @roq: Reorder queue
+ * @sn: New sequence number
+ */
+static
+void i2400m_roq_update_ws(struct i2400m *i2400m, struct i2400m_roq *roq,
+ unsigned sn)
+{
+ struct device *dev = i2400m_dev(i2400m);
+ unsigned old_ws, nsn, len;
+
+ d_fnstart(2, dev, "(i2400m %p roq %p sn %u)\n", i2400m, roq, sn);
+ old_ws = roq->ws;
+ len = skb_queue_len(&roq->queue);
+ nsn = __i2400m_roq_update_ws(i2400m, roq, sn);
+ i2400m_roq_log_add(i2400m, roq, I2400M_RO_TYPE_WS,
+ old_ws, len, sn, nsn, roq->ws);
+ d_fnstart(2, dev, "(i2400m %p roq %p sn %u) = void\n", i2400m, roq, sn);
+ return;
+}
+
+
+/*
+ * Queue a packet and update the window start
+ *
+ * @i2400m: device descriptor
+ * @cin: Queue Index
+ * @skb: containing the packet data
+ * @fbn: First block number of the packet in @skb
+ * @sn: Last block number of the packet in @skb
+ *
+ * Note that unlike i2400m_roq_update_ws(), which sets the new window
+ * start to @sn, in here we'll set it to @sn + 1.
+ */
+static
+void i2400m_roq_queue_update_ws(struct i2400m *i2400m, struct i2400m_roq *roq,
+ struct sk_buff * skb, unsigned sn)
+{
+ struct device *dev = i2400m_dev(i2400m);
+ unsigned nsn, old_ws, len;
+
+ d_fnstart(2, dev, "(i2400m %p roq %p skb %p sn %u)\n",
+ i2400m, roq, skb, sn);
+ len = skb_queue_len(&roq->queue);
+ nsn = __i2400m_roq_nsn(roq, sn);
+ old_ws = roq->ws;
+ if (unlikely(nsn >= 1024)) {
+ dev_err(dev, "SW BUG? queue_update_ws nsn %u (sn %u ws %u)\n",
+ nsn, sn, roq->ws);
+ i2400m_roq_log_dump(i2400m, roq);
+ i2400m->bus_reset(i2400m, I2400M_RT_WARM);
+ } else {
+ /* if the queue is empty, don't bother as we'd queue
+ * it and inmediately unqueue it -- just deliver it */
+ if (len == 0) {
+ struct i2400m_roq_data *roq_data;
+ roq_data = (struct i2400m_roq_data *) &skb->cb;
+ i2400m_net_erx(i2400m, skb, roq_data->cs);
+ }
+ else
+ __i2400m_roq_queue(i2400m, roq, skb, sn, nsn);
+ __i2400m_roq_update_ws(i2400m, roq, sn + 1);
+ i2400m_roq_log_add(i2400m, roq, I2400M_RO_TYPE_PACKET_WS,
+ old_ws, len, sn, nsn, roq->ws);
+ }
+ d_fnend(2, dev, "(i2400m %p roq %p skb %p sn %u) = void\n",
+ i2400m, roq, skb, sn);
+ return;
+}
+
+
/*
* Receive and send up an extended data packet
*
* having to copy packets around.
*
* This function handles said path.
+ *
+ *
+ * Receive and send up an extended data packet that requires no reordering
+ *
+ * @i2400m: device descriptor
+ * @skb_rx: skb that contains the extended data packet
+ * @single_last: 1 if the payload is the only one or the last one of
+ * the skb.
+ * @payload: pointer to the packet's data (past the actual extended
+ * data payload header).
+ * @size: size of the payload
+ *
+ * Pass over to the networking stack a data packet that might have
+ * reordering requirements.
+ *
+ * This needs to the decide if the skb in which the packet is
+ * contained can be reused or if it needs to be cloned. Then it has to
+ * be trimmed in the edges so that the beginning is the space for eth
+ * header and then pass it to i2400m_net_erx() for the stack
+ *
+ * Assumes the caller has verified the sanity of the payload (size,
+ * etc) already.
*/
static
void i2400m_rx_edata(struct i2400m *i2400m, struct sk_buff *skb_rx,
struct net_device *net_dev = i2400m->wimax_dev.net_dev;
struct sk_buff *skb;
enum i2400m_cs cs;
- unsigned reorder_needed;
+ u32 reorder;
+ unsigned ro_needed, ro_type, ro_cin, ro_sn;
+ struct i2400m_roq *roq;
+ struct i2400m_roq_data *roq_data;
- d_fnstart(4, dev, "(i2400m %p skb_rx %p single %u payload %p "
+ BUILD_BUG_ON(ETH_HLEN > sizeof(*hdr));
+
+ d_fnstart(2, dev, "(i2400m %p skb_rx %p single %u payload %p "
"size %zu)\n", i2400m, skb_rx, single_last, payload, size);
if (size < sizeof(*hdr)) {
dev_err(dev, "ERX: HW BUG? message with short header (%zu "
"vs %zu bytes expected)\n", size, sizeof(*hdr));
goto error;
}
- reorder_needed = le32_to_cpu(hdr->reorder & I2400M_REORDER_NEEDED);
- cs = hdr->cs;
- if (reorder_needed) {
- dev_err(dev, "ERX: HW BUG? reorder needed, it was disabled\n");
- goto error;
- }
- /* ok, so now decide if we want to clone or reuse the skb,
- * pull and trim it so the beginning is the space for the eth
- * header and pass it to i2400m_net_erx() for the stack */
+
if (single_last) {
skb = skb_get(skb_rx);
- d_printf(3, dev, "ERX: reusing single payload skb %p\n", skb);
+ d_printf(3, dev, "ERX: skb %p reusing\n", skb);
} else {
skb = skb_clone(skb_rx, GFP_KERNEL);
- d_printf(3, dev, "ERX: cloning %p\n", skb);
if (skb == NULL) {
dev_err(dev, "ERX: no memory to clone skb\n");
net_dev->stats.rx_dropped++;
goto error_skb_clone;
}
+ d_printf(3, dev, "ERX: skb %p cloned from %p\n", skb, skb_rx);
}
/* now we have to pull and trim so that the skb points to the
* beginning of the IP packet; the netdev part will add the
- * ethernet header as needed. */
- BUILD_BUG_ON(ETH_HLEN > sizeof(*hdr));
+ * ethernet header as needed - we know there is enough space
+ * because we checked in i2400m_rx_edata(). */
skb_pull(skb, payload + sizeof(*hdr) - (void *) skb->data);
- skb_trim(skb, (void *) skb_end_pointer(skb) - payload + sizeof(*hdr));
- i2400m_net_erx(i2400m, skb, cs);
+ skb_trim(skb, (void *) skb_end_pointer(skb) - payload - sizeof(*hdr));
+
+ reorder = le32_to_cpu(hdr->reorder);
+ ro_needed = reorder & I2400M_RO_NEEDED;
+ cs = hdr->cs;
+ if (ro_needed) {
+ ro_type = (reorder >> I2400M_RO_TYPE_SHIFT) & I2400M_RO_TYPE;
+ ro_cin = (reorder >> I2400M_RO_CIN_SHIFT) & I2400M_RO_CIN;
+ ro_sn = (reorder >> I2400M_RO_SN_SHIFT) & I2400M_RO_SN;
+
+ roq = &i2400m->rx_roq[ro_cin];
+ roq_data = (struct i2400m_roq_data *) &skb->cb;
+ roq_data->sn = ro_sn;
+ roq_data->cs = cs;
+ d_printf(2, dev, "ERX: reorder needed: "
+ "type %u cin %u [ws %u] sn %u/%u len %zuB\n",
+ ro_type, ro_cin, roq->ws, ro_sn,
+ __i2400m_roq_nsn(roq, ro_sn), size);
+ d_dump(2, dev, payload, size);
+ switch(ro_type) {
+ case I2400M_RO_TYPE_RESET:
+ i2400m_roq_reset(i2400m, roq);
+ kfree_skb(skb); /* no data here */
+ break;
+ case I2400M_RO_TYPE_PACKET:
+ i2400m_roq_queue(i2400m, roq, skb, ro_sn);
+ break;
+ case I2400M_RO_TYPE_WS:
+ i2400m_roq_update_ws(i2400m, roq, ro_sn);
+ kfree_skb(skb); /* no data here */
+ break;
+ case I2400M_RO_TYPE_PACKET_WS:
+ i2400m_roq_queue_update_ws(i2400m, roq, skb, ro_sn);
+ break;
+ default:
+ dev_err(dev, "HW BUG? unknown reorder type %u\n", ro_type);
+ }
+ }
+ else
+ i2400m_net_erx(i2400m, skb, cs);
error_skb_clone:
error:
- d_fnend(4, dev, "(i2400m %p skb_rx %p single %u payload %p "
+ d_fnend(2, dev, "(i2400m %p skb_rx %p single %u payload %p "
"size %zu) = void\n", i2400m, skb_rx, single_last, payload, size);
return;
}
-
-
/*
* Act on a received payload
*
* device. See the file header for the format. Run all checks on the
* buffer header, then run over each payload's descriptors, verify
* their consistency and act on each payload's contents. If
- * everything is succesful, update the device's statistics.
+ * everything is successful, update the device's statistics.
*
* Note: You need to set the skb to contain only the length of the
* received buffer; for that, use skb_trim(skb, RECEIVED_SIZE).
num_pls = le16_to_cpu(msg_hdr->num_pls);
pl_itr = sizeof(*msg_hdr) + /* Check payload descriptor(s) */
num_pls * sizeof(msg_hdr->pld[0]);
- pl_itr = ALIGN(pl_itr, I2400M_PL_PAD);
+ pl_itr = ALIGN(pl_itr, I2400M_PL_ALIGN);
if (pl_itr > skb->len) { /* got all the payload descriptors? */
dev_err(dev, "RX: HW BUG? message too short (%u bytes) for "
"%u payload descriptors (%zu each, total %zu)\n",
single_last = num_pls == 1 || i == num_pls - 1;
i2400m_rx_payload(i2400m, skb, single_last, &msg_hdr->pld[i],
skb->data + pl_itr);
- pl_itr += ALIGN(pl_size, I2400M_PL_PAD);
+ pl_itr += ALIGN(pl_size, I2400M_PL_ALIGN);
cond_resched(); /* Don't monopolize */
}
kfree_skb(skb);
return result;
}
EXPORT_SYMBOL_GPL(i2400m_rx);
+
+
+/*
+ * Initialize the RX queue and infrastructure
+ *
+ * This sets up all the RX reordering infrastructures, which will not
+ * be used if reordering is not enabled or if the firmware does not
+ * support it. The device is told to do reordering in
+ * i2400m_dev_initialize(), where it also looks at the value of the
+ * i2400m->rx_reorder switch before taking a decission.
+ *
+ * Note we allocate the roq queues in one chunk and the actual logging
+ * support for it (logging) in another one and then we setup the
+ * pointers from the first to the last.
+ */
+int i2400m_rx_setup(struct i2400m *i2400m)
+{
+ int result = 0;
+ struct device *dev = i2400m_dev(i2400m);
+
+ i2400m->rx_reorder = i2400m_rx_reorder_disabled? 0 : 1;
+ if (i2400m->rx_reorder) {
+ unsigned itr;
+ size_t size;
+ struct i2400m_roq_log *rd;
+
+ result = -ENOMEM;
+
+ size = sizeof(i2400m->rx_roq[0]) * (I2400M_RO_CIN + 1);
+ i2400m->rx_roq = kzalloc(size, GFP_KERNEL);
+ if (i2400m->rx_roq == NULL) {
+ dev_err(dev, "RX: cannot allocate %zu bytes for "
+ "reorder queues\n", size);
+ goto error_roq_alloc;
+ }
+
+ size = sizeof(*i2400m->rx_roq[0].log) * (I2400M_RO_CIN + 1);
+ rd = kzalloc(size, GFP_KERNEL);
+ if (rd == NULL) {
+ dev_err(dev, "RX: cannot allocate %zu bytes for "
+ "reorder queues log areas\n", size);
+ result = -ENOMEM;
+ goto error_roq_log_alloc;
+ }
+
+ for(itr = 0; itr < I2400M_RO_CIN + 1; itr++) {
+ __i2400m_roq_init(&i2400m->rx_roq[itr]);
+ i2400m->rx_roq[itr].log = &rd[itr];
+ }
+ }
+ return 0;
+
+error_roq_log_alloc:
+ kfree(i2400m->rx_roq);
+error_roq_alloc:
+ return result;
+}
+
+
+/* Tear down the RX queue and infrastructure */
+void i2400m_rx_release(struct i2400m *i2400m)
+{
+ if (i2400m->rx_reorder) {
+ unsigned itr;
+ for(itr = 0; itr < I2400M_RO_CIN + 1; itr++)
+ __skb_queue_purge(&i2400m->rx_roq[itr].queue);
+ kfree(i2400m->rx_roq[0].log);
+ kfree(i2400m->rx_roq);
+ }
+}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff