/* * 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/kernel.h> #include <linux/if_arp.h> #include <linux/netdevice.h> #include <linux/workqueue.h> #include "i2400m.h" #define D_SUBMODULE rx #include "debug-levels.h" struct i2400m_report_hook_args { struct sk_buff *skb_rx; const struct i2400m_l3l4_hdr *l3l4_hdr; size_t size; }; /* * Execute i2400m_report_hook in a workqueue * * Unpacks arguments from the deferred call, executes it and then * drops the references. * * Obvious NOTE: References are needed because we are a separate * thread; otherwise the buffer changes under us because it is * released by the original caller. */ static void i2400m_report_hook_work(struct work_struct *ws) { 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); kfree_skb(args->skb_rx); i2400m_put(iw->i2400m); kfree(iw); } /* * 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 (ack_skb == NULL) { dev_err(dev, "CMD/GET/SET ack: cannot allocate SKB\n"); i2400m->ack_skb = ERR_PTR(-ENOMEM); } else i2400m->ack_skb = ack_skb; spin_unlock_irqrestore(&i2400m->rx_lock, flags); complete(&i2400m->msg_completion); return; error_waiter_cancelled: kfree_skb(ack_skb); error_no_waiter: spin_unlock_irqrestore(&i2400m->rx_lock, flags); return; } /* * 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 preceeding 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) { /* These hooks have to be ran serialized; as well, the * handling might force the execution of commands, and * that might cause reentrancy issues with * bus-specific subdrivers and workqueues. So we run * it in a separate workqueue. */ struct i2400m_report_hook_args args = { .skb_rx = skb_rx, .l3l4_hdr = l3l4_hdr, .size = size }; if (unlikely(i2400m->ready == 0)) /* only send if up */ return; skb_get(skb_rx); i2400m_queue_work(i2400m, i2400m_report_hook_work, GFP_KERNEL, &args, sizeof(args)); 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 preceeding 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); if (unlikely(i2400m->ready == 0)) /* only send if up */ return; 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); 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 * * @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; 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; 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(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 * * @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 succesful, 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, skb_len; unsigned long flags; unsigned num_pls, single_last; skb_len = skb->len; d_fnstart(4, dev, "(i2400m %p skb %p [size %zu])\n", i2400m, skb, skb_len); result = -EIO; 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); pl_itr = sizeof(*msg_hdr) + /* Check payload descriptor(s) */ num_pls * sizeof(msg_hdr->pld[0]); pl_itr = ALIGN(pl_itr, I2400M_PL_PAD); 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_PAD); 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 %zu]) = %d\n", i2400m, skb, skb_len, result); 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); } }