diff options
Diffstat (limited to 'drivers/staging/wimax/i2400m/rx.c')
| -rw-r--r-- | drivers/staging/wimax/i2400m/rx.c | 1395 |
1 files changed, 1395 insertions, 0 deletions
diff --git a/drivers/staging/wimax/i2400m/rx.c b/drivers/staging/wimax/i2400m/rx.c new file mode 100644 index 000000000000..c9fb619a9e01 --- /dev/null +++ b/drivers/staging/wimax/i2400m/rx.c @@ -0,0 +1,1395 @@ +/* + * Intel Wireless WiMAX Connection 2400m + * Handle incoming traffic and deliver it to the control or data planes + * + * + * Copyright (C) 2007-2008 Intel Corporation. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * + * Intel Corporation <linux-wimax@intel.com> + * Yanir Lubetkin <yanirx.lubetkin@intel.com> + * - Initial implementation + * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> + * - 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. + * + * We receive an RX message from the bus-specific driver, which + * contains one or more payloads that have potentially different + * destinataries (data or control paths). + * + * So we just take that payload from the transport specific code in + * the form of an skb, break it up in chunks (a cloned skb each in the + * case of network packets) and pass it to netdev or to the + * command/ack handler (and from there to the WiMAX stack). + * + * PROTOCOL FORMAT + * + * The format of the buffer is: + * + * HEADER (struct i2400m_msg_hdr) + * PAYLOAD DESCRIPTOR 0 (struct i2400m_pld) + * PAYLOAD DESCRIPTOR 1 + * ... + * PAYLOAD DESCRIPTOR N + * PAYLOAD 0 (raw bytes) + * PAYLOAD 1 + * ... + * PAYLOAD N + * + * See tx.c for a deeper description on alignment requirements and + * other fun facts of it. + * + * DATA PACKETS + * + * In firmwares <= v1.3, data packets have no header for RX, but they + * do for TX (currently unused). + * + * 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). 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_rx_msg_hdr_check + * i2400m_rx_pl_descr_check + * i2400m_rx_payload + * 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] + * i2400m_report_hook + * wimax_msg_to_user + * i2400m_rx_ctl_ack + * wimax_msg_to_user_alloc + * i2400m_rx_trace + * i2400m_msg_size_check + * wimax_msg + */ +#include <linux/slab.h> +#include <linux/kernel.h> +#include <linux/if_arp.h> +#include <linux/netdevice.h> +#include <linux/workqueue.h> +#include <linux/export.h> +#include <linux/moduleparam.h> +#include "i2400m.h" + + +#define D_SUBMODULE rx +#include "debug-levels.h" + +static int i2400m_rx_reorder_disabled; /* 0 (rx reorder enabled) by default */ +module_param_named(rx_reorder_disabled, i2400m_rx_reorder_disabled, int, 0644); +MODULE_PARM_DESC(rx_reorder_disabled, + "If true, RX reordering will be disabled."); + +struct i2400m_report_hook_args { + struct sk_buff *skb_rx; + const struct i2400m_l3l4_hdr *l3l4_hdr; + size_t size; + struct list_head list_node; +}; + + +/* + * Execute i2400m_report_hook in a workqueue + * + * Goes over the list of queued reports in i2400m->rx_reports and + * processes them. + * + * NOTE: refcounts on i2400m are not needed because we flush the + * workqueue this runs on (i2400m->work_queue) before destroying + * i2400m. + */ +void i2400m_report_hook_work(struct work_struct *ws) +{ + struct i2400m *i2400m = container_of(ws, struct i2400m, rx_report_ws); + struct device *dev = i2400m_dev(i2400m); + struct i2400m_report_hook_args *args, *args_next; + LIST_HEAD(list); + unsigned long flags; + + while (1) { + spin_lock_irqsave(&i2400m->rx_lock, flags); + list_splice_init(&i2400m->rx_reports, &list); + spin_unlock_irqrestore(&i2400m->rx_lock, flags); + if (list_empty(&list)) + break; + else + d_printf(1, dev, "processing queued reports\n"); + list_for_each_entry_safe(args, args_next, &list, list_node) { + d_printf(2, dev, "processing queued report %p\n", args); + i2400m_report_hook(i2400m, args->l3l4_hdr, args->size); + kfree_skb(args->skb_rx); + list_del(&args->list_node); + kfree(args); + } + } +} + + +/* + * Flush the list of queued reports + */ +static +void i2400m_report_hook_flush(struct i2400m *i2400m) +{ + struct device *dev = i2400m_dev(i2400m); + struct i2400m_report_hook_args *args, *args_next; + LIST_HEAD(list); + unsigned long flags; + + d_printf(1, dev, "flushing queued reports\n"); + spin_lock_irqsave(&i2400m->rx_lock, flags); + list_splice_init(&i2400m->rx_reports, &list); + spin_unlock_irqrestore(&i2400m->rx_lock, flags); + list_for_each_entry_safe(args, args_next, &list, list_node) { + d_printf(2, dev, "flushing queued report %p\n", args); + kfree_skb(args->skb_rx); + list_del(&args->list_node); + kfree(args); + } +} + + +/* + * Queue a report for later processing + * + * @i2400m: device descriptor + * @skb_rx: skb that contains the payload (for reference counting) + * @l3l4_hdr: pointer to the control + * @size: size of the message + */ +static +void i2400m_report_hook_queue(struct i2400m *i2400m, struct sk_buff *skb_rx, + const void *l3l4_hdr, size_t size) +{ + struct device *dev = i2400m_dev(i2400m); + unsigned long flags; + struct i2400m_report_hook_args *args; + + args = kzalloc(sizeof(*args), GFP_NOIO); + if (args) { + args->skb_rx = skb_get(skb_rx); + args->l3l4_hdr = l3l4_hdr; + args->size = size; + spin_lock_irqsave(&i2400m->rx_lock, flags); + list_add_tail(&args->list_node, &i2400m->rx_reports); + spin_unlock_irqrestore(&i2400m->rx_lock, flags); + d_printf(2, dev, "queued report %p\n", args); + rmb(); /* see i2400m->ready's documentation */ + if (likely(i2400m->ready)) /* only send if up */ + queue_work(i2400m->work_queue, &i2400m->rx_report_ws); + } else { + if (printk_ratelimit()) + dev_err(dev, "%s:%u: Can't allocate %zu B\n", + __func__, __LINE__, sizeof(*args)); + } +} + + +/* + * Process an ack to a command + * + * @i2400m: device descriptor + * @payload: pointer to message + * @size: size of the message + * + * Pass the acknodledgment (in an skb) to the thread that is waiting + * for it in i2400m->msg_completion. + * + * We need to coordinate properly with the thread waiting for the + * ack. Check if it is waiting or if it is gone. We loose the spinlock + * to avoid allocating on atomic contexts (yeah, could use GFP_ATOMIC, + * but this is not so speed critical). + */ +static +void i2400m_rx_ctl_ack(struct i2400m *i2400m, + const void *payload, size_t size) +{ + struct device *dev = i2400m_dev(i2400m); + struct wimax_dev *wimax_dev = &i2400m->wimax_dev; + unsigned long flags; + struct sk_buff *ack_skb; + + /* Anyone waiting for an answer? */ + spin_lock_irqsave(&i2400m->rx_lock, flags); + if (i2400m->ack_skb != ERR_PTR(-EINPROGRESS)) { + dev_err(dev, "Huh? reply to command with no waiters\n"); + goto error_no_waiter; + } + spin_unlock_irqrestore(&i2400m->rx_lock, flags); + + ack_skb = wimax_msg_alloc(wimax_dev, NULL, payload, size, GFP_KERNEL); + + /* Check waiter didn't time out waiting for the answer... */ + spin_lock_irqsave(&i2400m->rx_lock, flags); + if (i2400m->ack_skb != ERR_PTR(-EINPROGRESS)) { + d_printf(1, dev, "Huh? waiter for command reply cancelled\n"); + goto error_waiter_cancelled; + } + if (IS_ERR(ack_skb)) + dev_err(dev, "CMD/GET/SET ack: cannot allocate SKB\n"); + i2400m->ack_skb = ack_skb; + spin_unlock_irqrestore(&i2400m->rx_lock, flags); + complete(&i2400m->msg_completion); + return; + +error_waiter_cancelled: + if (!IS_ERR(ack_skb)) + kfree_skb(ack_skb); +error_no_waiter: + spin_unlock_irqrestore(&i2400m->rx_lock, flags); +} + + +/* + * Receive and process a control payload + * + * @i2400m: device descriptor + * @skb_rx: skb that contains the payload (for reference counting) + * @payload: pointer to message + * @size: size of the message + * + * There are two types of control RX messages: reports (asynchronous, + * like your every day interrupts) and 'acks' (reponses to a command, + * get or set request). + * + * If it is a report, we run hooks on it (to extract information for + * things we need to do in the driver) and then pass it over to the + * WiMAX stack to send it to user space. + * + * NOTE: report processing is done in a workqueue specific to the + * generic driver, to avoid deadlocks in the system. + * + * If it is not a report, it is an ack to a previously executed + * command, set or get, so wake up whoever is waiting for it from + * i2400m_msg_to_dev(). i2400m_rx_ctl_ack() takes care of that. + * + * Note that the sizes we pass to other functions from here are the + * sizes of the _l3l4_hdr + payload, not full buffer sizes, as we have + * verified in _msg_size_check() that they are congruent. + * + * For reports: We can't clone the original skb where the data is + * because we need to send this up via netlink; netlink has to add + * headers and we can't overwrite what's preceding the payload...as + * it is another message. So we just dup them. + */ +static +void i2400m_rx_ctl(struct i2400m *i2400m, struct sk_buff *skb_rx, + const void *payload, size_t size) +{ + int result; + struct device *dev = i2400m_dev(i2400m); + const struct i2400m_l3l4_hdr *l3l4_hdr = payload; + unsigned msg_type; + + result = i2400m_msg_size_check(i2400m, l3l4_hdr, size); + if (result < 0) { + dev_err(dev, "HW BUG? device sent a bad message: %d\n", + result); + goto error_check; + } + msg_type = le16_to_cpu(l3l4_hdr->type); + d_printf(1, dev, "%s 0x%04x: %zu bytes\n", + msg_type & I2400M_MT_REPORT_MASK ? "REPORT" : "CMD/SET/GET", + msg_type, size); + d_dump(2, dev, l3l4_hdr, size); + if (msg_type & I2400M_MT_REPORT_MASK) { + /* + * Process each report + * + * - has to be ran serialized as well + * + * - the handling might force the execution of + * commands. That might cause reentrancy issues with + * bus-specific subdrivers and workqueues, so the we + * run it in a separate workqueue. + * + * - when the driver is not yet ready to handle them, + * they are queued and at some point the queue is + * restarted [NOTE: we can't queue SKBs directly, as + * this might be a piece of a SKB, not the whole + * thing, and this is cheaper than cloning the + * SKB]. + * + * Note we don't do refcounting for the device + * structure; this is because before destroying + * 'i2400m', we make sure to flush the + * i2400m->work_queue, so there are no issues. + */ + i2400m_report_hook_queue(i2400m, skb_rx, l3l4_hdr, size); + 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) + dev_err(dev, "error sending report to userspace: %d\n", + result); + } else /* an ack to a CMD, GET or SET */ + i2400m_rx_ctl_ack(i2400m, payload, size); +error_check: + return; +} + + +/* + * Receive and send up a trace + * + * @i2400m: device descriptor + * @skb_rx: skb that contains the trace (for reference counting) + * @payload: pointer to trace message inside the skb + * @size: size of the message + * + * THe i2400m might produce trace information (diagnostics) and we + * send them through a different kernel-to-user pipe (to avoid + * clogging it). + * + * As in i2400m_rx_ctl(), we can't clone the original skb where the + * data is because we need to send this up via netlink; netlink has to + * add headers and we can't overwrite what's preceding the + * payload...as it is another message. So we just dup them. + */ +static +void i2400m_rx_trace(struct i2400m *i2400m, + const void *payload, size_t size) +{ + int result; + struct device *dev = i2400m_dev(i2400m); + struct wimax_dev *wimax_dev = &i2400m->wimax_dev; + const struct i2400m_l3l4_hdr *l3l4_hdr = payload; + unsigned msg_type; + + result = i2400m_msg_size_check(i2400m, l3l4_hdr, size); + if (result < 0) { + dev_err(dev, "HW BUG? device sent a bad trace message: %d\n", + result); + goto error_check; + } + msg_type = le16_to_cpu(l3l4_hdr->type); + d_printf(1, dev, "Trace %s 0x%04x: %zu bytes\n", + msg_type & I2400M_MT_REPORT_MASK ? "REPORT" : "CMD/SET/GET", + msg_type, size); + d_dump(2, dev, l3l4_hdr, size); + result = wimax_msg(wimax_dev, "trace", l3l4_hdr, size, GFP_KERNEL); + if (result < 0) + dev_err(dev, "error sending trace to userspace: %d\n", + result); +error_check: + 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); +} + + +/* + * 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); + /* + * For type 2(update_window_start) rx messages, there is no + * need to check if the normalized sequence number is greater 1023. + * Simply insert and deliver all packets to the host up to the + * window start. + */ + 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); +} + + +/* + * 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_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); +} + + +/* + * 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); +} + + +/* + * 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); + /* + * For type 3(queue_update_window_start) rx messages, there is no + * need to check if the normalized sequence number is greater 1023. + * Simply insert and deliver all packets to the host up to the + * window start. + */ + old_ws = roq->ws; + /* If the queue is empty, don't bother as we'd queue + * it and immediately 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); +} + + +/* + * This routine destroys the memory allocated for rx_roq, when no + * other thread is accessing it. Access to rx_roq is refcounted by + * rx_roq_refcount, hence memory allocated must be destroyed when + * rx_roq_refcount becomes zero. This routine gets executed when + * rx_roq_refcount becomes zero. + */ +static void i2400m_rx_roq_destroy(struct kref *ref) +{ + unsigned itr; + struct i2400m *i2400m + = container_of(ref, struct i2400m, rx_roq_refcount); + 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); + i2400m->rx_roq = NULL; +} + +/* + * Receive and send up an extended data packet + * + * @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 inside the skb + * @size: size of the payload + * + * Starting in v1.4 of the i2400m's firmware, the device can send data + * packets to the host in an extended format that; this incudes a 16 + * byte header (struct i2400m_pl_edata_hdr). Using this header's space + * we can fake ethernet headers for ethernet device emulation without + * 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, + unsigned single_last, const void *payload, size_t size) +{ + struct device *dev = i2400m_dev(i2400m); + const struct i2400m_pl_edata_hdr *hdr = payload; + struct net_device *net_dev = i2400m->wimax_dev.net_dev; + struct sk_buff *skb; + enum i2400m_cs cs; + u32 reorder; + unsigned ro_needed, ro_type, ro_cin, ro_sn; + struct i2400m_roq *roq; + struct i2400m_roq_data *roq_data; + unsigned long flags; + + 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; + } + + if (single_last) { + skb = skb_get(skb_rx); + d_printf(3, dev, "ERX: skb %p reusing\n", skb); + } else { + skb = skb_clone(skb_rx, GFP_KERNEL); + 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 - 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)); + + 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; + + spin_lock_irqsave(&i2400m->rx_lock, flags); + if (i2400m->rx_roq == NULL) { + kfree_skb(skb); /* rx_roq is already destroyed */ + spin_unlock_irqrestore(&i2400m->rx_lock, flags); + goto error; + } + roq = &i2400m->rx_roq[ro_cin]; + kref_get(&i2400m->rx_roq_refcount); + spin_unlock_irqrestore(&i2400m->rx_lock, flags); + + 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); + } + + spin_lock_irqsave(&i2400m->rx_lock, flags); + kref_put(&i2400m->rx_roq_refcount, i2400m_rx_roq_destroy); + spin_unlock_irqrestore(&i2400m->rx_lock, flags); + } + else + i2400m_net_erx(i2400m, skb, cs); +error_skb_clone: +error: + d_fnend(2, dev, "(i2400m %p skb_rx %p single %u payload %p " + "size %zu) = void\n", i2400m, skb_rx, single_last, payload, size); +} + + +/* + * Act on a received payload + * + * @i2400m: device instance + * @skb_rx: skb where the transaction was received + * @single_last: 1 this is the only payload or the last one (so the + * skb can be reused instead of cloned). + * @pld: payload descriptor + * @payload: payload data + * + * Upon reception of a payload, look at its guts in the payload + * descriptor and decide what to do with it. If it is a single payload + * skb or if the last skb is a data packet, the skb will be referenced + * and modified (so it doesn't have to be cloned). + */ +static +void i2400m_rx_payload(struct i2400m *i2400m, struct sk_buff *skb_rx, + unsigned single_last, const struct i2400m_pld *pld, + const void *payload) +{ + struct device *dev = i2400m_dev(i2400m); + size_t pl_size = i2400m_pld_size(pld); + enum i2400m_pt pl_type = i2400m_pld_type(pld); + + d_printf(7, dev, "RX: received payload type %u, %zu bytes\n", + pl_type, pl_size); + d_dump(8, dev, payload, pl_size); + + switch (pl_type) { + case I2400M_PT_DATA: + d_printf(3, dev, "RX: data payload %zu bytes\n", pl_size); + i2400m_net_rx(i2400m, skb_rx, single_last, payload, pl_size); + break; + case I2400M_PT_CTRL: + i2400m_rx_ctl(i2400m, skb_rx, payload, pl_size); + break; + case I2400M_PT_TRACE: + i2400m_rx_trace(i2400m, payload, pl_size); + break; + case I2400M_PT_EDATA: + d_printf(3, dev, "ERX: data payload %zu bytes\n", pl_size); + i2400m_rx_edata(i2400m, skb_rx, single_last, payload, pl_size); + break; + default: /* Anything else shouldn't come to the host */ + if (printk_ratelimit()) + dev_err(dev, "RX: HW BUG? unexpected payload type %u\n", + pl_type); + } +} + + +/* + * Check a received transaction's message header + * + * @i2400m: device descriptor + * @msg_hdr: message header + * @buf_size: size of the received buffer + * + * Check that the declarations done by a RX buffer message header are + * sane and consistent with the amount of data that was received. + */ +static +int i2400m_rx_msg_hdr_check(struct i2400m *i2400m, + const struct i2400m_msg_hdr *msg_hdr, + size_t buf_size) +{ + int result = -EIO; + struct device *dev = i2400m_dev(i2400m); + if (buf_size < sizeof(*msg_hdr)) { + dev_err(dev, "RX: HW BUG? message with short header (%zu " + "vs %zu bytes expected)\n", buf_size, sizeof(*msg_hdr)); + goto error; + } + if (msg_hdr->barker != cpu_to_le32(I2400M_D2H_MSG_BARKER)) { + dev_err(dev, "RX: HW BUG? message received with unknown " + "barker 0x%08x (buf_size %zu bytes)\n", + le32_to_cpu(msg_hdr->barker), buf_size); + goto error; + } + if (msg_hdr->num_pls == 0) { + dev_err(dev, "RX: HW BUG? zero payload packets in message\n"); + goto error; + } + if (le16_to_cpu(msg_hdr->num_pls) > I2400M_MAX_PLS_IN_MSG) { + dev_err(dev, "RX: HW BUG? message contains more payload " + "than maximum; ignoring.\n"); + goto error; + } + result = 0; +error: + return result; +} + + +/* + * Check a payload descriptor against the received data + * + * @i2400m: device descriptor + * @pld: payload descriptor + * @pl_itr: offset (in bytes) in the received buffer the payload is + * located + * @buf_size: size of the received buffer + * + * Given a payload descriptor (part of a RX buffer), check it is sane + * and that the data it declares fits in the buffer. + */ +static +int i2400m_rx_pl_descr_check(struct i2400m *i2400m, + const struct i2400m_pld *pld, + size_t pl_itr, size_t buf_size) +{ + int result = -EIO; + struct device *dev = i2400m_dev(i2400m); + size_t pl_size = i2400m_pld_size(pld); + enum i2400m_pt pl_type = i2400m_pld_type(pld); + + if (pl_size > i2400m->bus_pl_size_max) { + dev_err(dev, "RX: HW BUG? payload @%zu: size %zu is " + "bigger than maximum %zu; ignoring message\n", + pl_itr, pl_size, i2400m->bus_pl_size_max); + goto error; + } + if (pl_itr + pl_size > buf_size) { /* enough? */ + dev_err(dev, "RX: HW BUG? payload @%zu: size %zu " + "goes beyond the received buffer " + "size (%zu bytes); ignoring message\n", + pl_itr, pl_size, buf_size); + goto error; + } + if (pl_type >= I2400M_PT_ILLEGAL) { + dev_err(dev, "RX: HW BUG? illegal payload type %u; " + "ignoring message\n", pl_type); + goto error; + } + result = 0; +error: + return result; +} + + +/** + * i2400m_rx - Receive a buffer of data from the device + * + * @i2400m: device descriptor + * @skb: skbuff where the data has been received + * + * Parse in a buffer of data that contains an RX message sent from the + * 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 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). + * + * Returns: + * + * 0 if ok, < 0 errno on error + * + * If ok, this function owns now the skb and the caller DOESN'T have + * to run kfree_skb() on it. However, on error, the caller still owns + * the skb and it is responsible for releasing it. + */ +int i2400m_rx(struct i2400m *i2400m, struct sk_buff *skb) +{ + int i, result; + struct device *dev = i2400m_dev(i2400m); + const struct i2400m_msg_hdr *msg_hdr; + size_t pl_itr, pl_size; + unsigned long flags; + unsigned num_pls, single_last, skb_len; + + skb_len = skb->len; + d_fnstart(4, dev, "(i2400m %p skb %p [size %u])\n", + i2400m, skb, skb_len); + msg_hdr = (void *) skb->data; + result = i2400m_rx_msg_hdr_check(i2400m, msg_hdr, skb_len); + if (result < 0) + goto error_msg_hdr_check; + result = -EIO; + num_pls = le16_to_cpu(msg_hdr->num_pls); + /* Check payload descriptor(s) */ + pl_itr = struct_size(msg_hdr, pld, num_pls); + 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", + skb_len, num_pls, sizeof(msg_hdr->pld[0]), pl_itr); + goto error_pl_descr_short; + } + /* Walk each payload payload--check we really got it */ + for (i = 0; i < num_pls; i++) { + /* work around old gcc warnings */ + pl_size = i2400m_pld_size(&msg_hdr->pld[i]); + result = i2400m_rx_pl_descr_check(i2400m, &msg_hdr->pld[i], + pl_itr, skb_len); + if (result < 0) + goto error_pl_descr_check; + 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_ALIGN); + cond_resched(); /* Don't monopolize */ + } + kfree_skb(skb); + /* Update device statistics */ + spin_lock_irqsave(&i2400m->rx_lock, flags); + i2400m->rx_pl_num += i; + if (i > i2400m->rx_pl_max) + i2400m->rx_pl_max = i; + if (i < i2400m->rx_pl_min) + i2400m->rx_pl_min = i; + i2400m->rx_num++; + i2400m->rx_size_acc += skb_len; + if (skb_len < i2400m->rx_size_min) + i2400m->rx_size_min = skb_len; + if (skb_len > i2400m->rx_size_max) + i2400m->rx_size_max = skb_len; + spin_unlock_irqrestore(&i2400m->rx_lock, flags); +error_pl_descr_check: +error_pl_descr_short: +error_msg_hdr_check: + d_fnend(4, dev, "(i2400m %p skb %p [size %u]) = %d\n", + i2400m, skb, skb_len, result); + return result; +} +EXPORT_SYMBOL_GPL(i2400m_rx); + + +void i2400m_unknown_barker(struct i2400m *i2400m, + const void *buf, size_t size) +{ + struct device *dev = i2400m_dev(i2400m); + char prefix[64]; + const __le32 *barker = buf; + dev_err(dev, "RX: HW BUG? unknown barker %08x, " + "dropping %zu bytes\n", le32_to_cpu(*barker), size); + snprintf(prefix, sizeof(prefix), "%s %s: ", + dev_driver_string(dev), dev_name(dev)); + if (size > 64) { + print_hex_dump(KERN_ERR, prefix, DUMP_PREFIX_OFFSET, + 8, 4, buf, 64, 0); + printk(KERN_ERR "%s... (only first 64 bytes " + "dumped)\n", prefix); + } else + print_hex_dump(KERN_ERR, prefix, DUMP_PREFIX_OFFSET, + 8, 4, buf, size, 0); +} +EXPORT_SYMBOL(i2400m_unknown_barker); + + +/* + * 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; + + i2400m->rx_reorder = i2400m_rx_reorder_disabled? 0 : 1; + if (i2400m->rx_reorder) { + unsigned itr; + struct i2400m_roq_log *rd; + + result = -ENOMEM; + + i2400m->rx_roq = kcalloc(I2400M_RO_CIN + 1, + sizeof(i2400m->rx_roq[0]), GFP_KERNEL); + if (i2400m->rx_roq == NULL) + goto error_roq_alloc; + + rd = kcalloc(I2400M_RO_CIN + 1, sizeof(*i2400m->rx_roq[0].log), + GFP_KERNEL); + if (rd == NULL) { + 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]; + } + kref_init(&i2400m->rx_roq_refcount); + } + 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) +{ + unsigned long flags; + + if (i2400m->rx_reorder) { + spin_lock_irqsave(&i2400m->rx_lock, flags); + kref_put(&i2400m->rx_roq_refcount, i2400m_rx_roq_destroy); + spin_unlock_irqrestore(&i2400m->rx_lock, flags); + } + /* at this point, nothing can be received... */ + i2400m_report_hook_flush(i2400m); +} |