diff options
Diffstat (limited to 'drivers/uwb/i1480/i1480u-wlp/rx.c')
-rw-r--r-- | drivers/uwb/i1480/i1480u-wlp/rx.c | 474 |
1 files changed, 0 insertions, 474 deletions
diff --git a/drivers/uwb/i1480/i1480u-wlp/rx.c b/drivers/uwb/i1480/i1480u-wlp/rx.c deleted file mode 100644 index d4e51e108aa..00000000000 --- a/drivers/uwb/i1480/i1480u-wlp/rx.c +++ /dev/null @@ -1,474 +0,0 @@ -/* - * WUSB Wire Adapter: WLP interface - * Driver for the Linux Network stack. - * - * Copyright (C) 2005-2006 Intel Corporation - * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com> - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License version - * 2 as published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA - * 02110-1301, USA. - * - * - * i1480u's RX handling is simple. i1480u will send the received - * network packets broken up in fragments; 1 to N fragments make a - * packet, we assemble them together and deliver the packet with netif_rx(). - * - * Beacuse each USB transfer is a *single* fragment (except when the - * transfer contains a first fragment), each URB called thus - * back contains one or two fragments. So we queue N URBs, each with its own - * fragment buffer. When a URB is done, we process it (adding to the - * current skb from the fragment buffer until complete). Once - * processed, we requeue the URB. There is always a bunch of URBs - * ready to take data, so the intergap should be minimal. - * - * An URB's transfer buffer is the data field of a socket buffer. This - * reduces copying as data can be passed directly to network layer. If a - * complete packet or 1st fragment is received the URB's transfer buffer is - * taken away from it and used to send data to the network layer. In this - * case a new transfer buffer is allocated to the URB before being requeued. - * If a "NEXT" or "LAST" fragment is received, the fragment contents is - * appended to the RX packet under construction and the transfer buffer - * is reused. To be able to use this buffer to assemble complete packets - * we set each buffer's size to that of the MAX ethernet packet that can - * be received. There is thus room for improvement in memory usage. - * - * When the max tx fragment size increases, we should be able to read - * data into the skbs directly with very simple code. - * - * ROADMAP: - * - * ENTRY POINTS: - * - * i1480u_rx_setup(): setup RX context [from i1480u_open()] - * - * i1480u_rx_release(): release RX context [from i1480u_stop()] - * - * i1480u_rx_cb(): called when the RX USB URB receives a - * packet. It removes the header and pushes it up - * the Linux netdev stack with netif_rx(). - * - * i1480u_rx_buffer() - * i1480u_drop() and i1480u_fix() - * i1480u_skb_deliver - * - */ - -#include <linux/gfp.h> -#include <linux/netdevice.h> -#include <linux/etherdevice.h> -#include "i1480u-wlp.h" - -/* - * Setup the RX context - * - * Each URB is provided with a transfer_buffer that is the data field - * of a new socket buffer. - */ -int i1480u_rx_setup(struct i1480u *i1480u) -{ - int result, cnt; - struct device *dev = &i1480u->usb_iface->dev; - struct net_device *net_dev = i1480u->net_dev; - struct usb_endpoint_descriptor *epd; - struct sk_buff *skb; - - /* Alloc RX stuff */ - i1480u->rx_skb = NULL; /* not in process of receiving packet */ - result = -ENOMEM; - epd = &i1480u->usb_iface->cur_altsetting->endpoint[1].desc; - for (cnt = 0; cnt < i1480u_RX_BUFS; cnt++) { - struct i1480u_rx_buf *rx_buf = &i1480u->rx_buf[cnt]; - rx_buf->i1480u = i1480u; - skb = dev_alloc_skb(i1480u_MAX_RX_PKT_SIZE); - if (!skb) { - dev_err(dev, - "RX: cannot allocate RX buffer %d\n", cnt); - result = -ENOMEM; - goto error; - } - skb->dev = net_dev; - skb->ip_summed = CHECKSUM_NONE; - skb_reserve(skb, 2); - rx_buf->data = skb; - rx_buf->urb = usb_alloc_urb(0, GFP_KERNEL); - if (unlikely(rx_buf->urb == NULL)) { - dev_err(dev, "RX: cannot allocate URB %d\n", cnt); - result = -ENOMEM; - goto error; - } - usb_fill_bulk_urb(rx_buf->urb, i1480u->usb_dev, - usb_rcvbulkpipe(i1480u->usb_dev, epd->bEndpointAddress), - rx_buf->data->data, i1480u_MAX_RX_PKT_SIZE - 2, - i1480u_rx_cb, rx_buf); - result = usb_submit_urb(rx_buf->urb, GFP_NOIO); - if (unlikely(result < 0)) { - dev_err(dev, "RX: cannot submit URB %d: %d\n", - cnt, result); - goto error; - } - } - return 0; - -error: - i1480u_rx_release(i1480u); - return result; -} - - -/* Release resources associated to the rx context */ -void i1480u_rx_release(struct i1480u *i1480u) -{ - int cnt; - for (cnt = 0; cnt < i1480u_RX_BUFS; cnt++) { - if (i1480u->rx_buf[cnt].data) - dev_kfree_skb(i1480u->rx_buf[cnt].data); - if (i1480u->rx_buf[cnt].urb) { - usb_kill_urb(i1480u->rx_buf[cnt].urb); - usb_free_urb(i1480u->rx_buf[cnt].urb); - } - } - if (i1480u->rx_skb != NULL) - dev_kfree_skb(i1480u->rx_skb); -} - -static -void i1480u_rx_unlink_urbs(struct i1480u *i1480u) -{ - int cnt; - for (cnt = 0; cnt < i1480u_RX_BUFS; cnt++) { - if (i1480u->rx_buf[cnt].urb) - usb_unlink_urb(i1480u->rx_buf[cnt].urb); - } -} - -/* Fix an out-of-sequence packet */ -#define i1480u_fix(i1480u, msg...) \ -do { \ - if (printk_ratelimit()) \ - dev_err(&i1480u->usb_iface->dev, msg); \ - dev_kfree_skb_irq(i1480u->rx_skb); \ - i1480u->rx_skb = NULL; \ - i1480u->rx_untd_pkt_size = 0; \ -} while (0) - - -/* Drop an out-of-sequence packet */ -#define i1480u_drop(i1480u, msg...) \ -do { \ - if (printk_ratelimit()) \ - dev_err(&i1480u->usb_iface->dev, msg); \ - i1480u->net_dev->stats.rx_dropped++; \ -} while (0) - - - - -/* Finalizes setting up the SKB and delivers it - * - * We first pass the incoming frame to WLP substack for verification. It - * may also be a WLP association frame in which case WLP will take over the - * processing. If WLP does not take it over it will still verify it, if the - * frame is invalid the skb will be freed by WLP and we will not continue - * parsing. - * */ -static -void i1480u_skb_deliver(struct i1480u *i1480u) -{ - int should_parse; - struct net_device *net_dev = i1480u->net_dev; - struct device *dev = &i1480u->usb_iface->dev; - - should_parse = wlp_receive_frame(dev, &i1480u->wlp, i1480u->rx_skb, - &i1480u->rx_srcaddr); - if (!should_parse) - goto out; - i1480u->rx_skb->protocol = eth_type_trans(i1480u->rx_skb, net_dev); - net_dev->stats.rx_packets++; - net_dev->stats.rx_bytes += i1480u->rx_untd_pkt_size; - - netif_rx(i1480u->rx_skb); /* deliver */ -out: - i1480u->rx_skb = NULL; - i1480u->rx_untd_pkt_size = 0; -} - - -/* - * Process a buffer of data received from the USB RX endpoint - * - * First fragment arrives with next or last fragment. All other fragments - * arrive alone. - * - * /me hates long functions. - */ -static -void i1480u_rx_buffer(struct i1480u_rx_buf *rx_buf) -{ - unsigned pkt_completed = 0; /* !0 when we got all pkt fragments */ - size_t untd_hdr_size, untd_frg_size; - size_t i1480u_hdr_size; - struct wlp_rx_hdr *i1480u_hdr = NULL; - - struct i1480u *i1480u = rx_buf->i1480u; - struct sk_buff *skb = rx_buf->data; - int size_left = rx_buf->urb->actual_length; - void *ptr = rx_buf->urb->transfer_buffer; /* also rx_buf->data->data */ - struct untd_hdr *untd_hdr; - - struct net_device *net_dev = i1480u->net_dev; - struct device *dev = &i1480u->usb_iface->dev; - struct sk_buff *new_skb; - -#if 0 - dev_fnstart(dev, - "(i1480u %p ptr %p size_left %zu)\n", i1480u, ptr, size_left); - dev_err(dev, "RX packet, %zu bytes\n", size_left); - dump_bytes(dev, ptr, size_left); -#endif - i1480u_hdr_size = sizeof(struct wlp_rx_hdr); - - while (size_left > 0) { - if (pkt_completed) { - i1480u_drop(i1480u, "RX: fragment follows completed" - "packet in same buffer. Dropping\n"); - break; - } - untd_hdr = ptr; - if (size_left < sizeof(*untd_hdr)) { /* Check the UNTD header */ - i1480u_drop(i1480u, "RX: short UNTD header! Dropping\n"); - goto out; - } - if (unlikely(untd_hdr_rx_tx(untd_hdr) == 0)) { /* Paranoia: TX set? */ - i1480u_drop(i1480u, "RX: TX bit set! Dropping\n"); - goto out; - } - switch (untd_hdr_type(untd_hdr)) { /* Check the UNTD header type */ - case i1480u_PKT_FRAG_1ST: { - struct untd_hdr_1st *untd_hdr_1st = (void *) untd_hdr; - dev_dbg(dev, "1st fragment\n"); - untd_hdr_size = sizeof(struct untd_hdr_1st); - if (i1480u->rx_skb != NULL) - i1480u_fix(i1480u, "RX: 1st fragment out of " - "sequence! Fixing\n"); - if (size_left < untd_hdr_size + i1480u_hdr_size) { - i1480u_drop(i1480u, "RX: short 1st fragment! " - "Dropping\n"); - goto out; - } - i1480u->rx_untd_pkt_size = le16_to_cpu(untd_hdr->len) - - i1480u_hdr_size; - untd_frg_size = le16_to_cpu(untd_hdr_1st->fragment_len); - if (size_left < untd_hdr_size + untd_frg_size) { - i1480u_drop(i1480u, - "RX: short payload! Dropping\n"); - goto out; - } - i1480u->rx_skb = skb; - i1480u_hdr = (void *) untd_hdr_1st + untd_hdr_size; - i1480u->rx_srcaddr = i1480u_hdr->srcaddr; - skb_put(i1480u->rx_skb, untd_hdr_size + untd_frg_size); - skb_pull(i1480u->rx_skb, untd_hdr_size + i1480u_hdr_size); - stats_add_sample(&i1480u->lqe_stats, (s8) i1480u_hdr->LQI - 7); - stats_add_sample(&i1480u->rssi_stats, i1480u_hdr->RSSI + 18); - rx_buf->data = NULL; /* need to create new buffer */ - break; - } - case i1480u_PKT_FRAG_NXT: { - dev_dbg(dev, "nxt fragment\n"); - untd_hdr_size = sizeof(struct untd_hdr_rst); - if (i1480u->rx_skb == NULL) { - i1480u_drop(i1480u, "RX: next fragment out of " - "sequence! Dropping\n"); - goto out; - } - if (size_left < untd_hdr_size) { - i1480u_drop(i1480u, "RX: short NXT fragment! " - "Dropping\n"); - goto out; - } - untd_frg_size = le16_to_cpu(untd_hdr->len); - if (size_left < untd_hdr_size + untd_frg_size) { - i1480u_drop(i1480u, - "RX: short payload! Dropping\n"); - goto out; - } - memmove(skb_put(i1480u->rx_skb, untd_frg_size), - ptr + untd_hdr_size, untd_frg_size); - break; - } - case i1480u_PKT_FRAG_LST: { - dev_dbg(dev, "Lst fragment\n"); - untd_hdr_size = sizeof(struct untd_hdr_rst); - if (i1480u->rx_skb == NULL) { - i1480u_drop(i1480u, "RX: last fragment out of " - "sequence! Dropping\n"); - goto out; - } - if (size_left < untd_hdr_size) { - i1480u_drop(i1480u, "RX: short LST fragment! " - "Dropping\n"); - goto out; - } - untd_frg_size = le16_to_cpu(untd_hdr->len); - if (size_left < untd_frg_size + untd_hdr_size) { - i1480u_drop(i1480u, - "RX: short payload! Dropping\n"); - goto out; - } - memmove(skb_put(i1480u->rx_skb, untd_frg_size), - ptr + untd_hdr_size, untd_frg_size); - pkt_completed = 1; - break; - } - case i1480u_PKT_FRAG_CMP: { - dev_dbg(dev, "cmp fragment\n"); - untd_hdr_size = sizeof(struct untd_hdr_cmp); - if (i1480u->rx_skb != NULL) - i1480u_fix(i1480u, "RX: fix out-of-sequence CMP" - " fragment!\n"); - if (size_left < untd_hdr_size + i1480u_hdr_size) { - i1480u_drop(i1480u, "RX: short CMP fragment! " - "Dropping\n"); - goto out; - } - i1480u->rx_untd_pkt_size = le16_to_cpu(untd_hdr->len); - untd_frg_size = i1480u->rx_untd_pkt_size; - if (size_left < i1480u->rx_untd_pkt_size + untd_hdr_size) { - i1480u_drop(i1480u, - "RX: short payload! Dropping\n"); - goto out; - } - i1480u->rx_skb = skb; - i1480u_hdr = (void *) untd_hdr + untd_hdr_size; - i1480u->rx_srcaddr = i1480u_hdr->srcaddr; - stats_add_sample(&i1480u->lqe_stats, (s8) i1480u_hdr->LQI - 7); - stats_add_sample(&i1480u->rssi_stats, i1480u_hdr->RSSI + 18); - skb_put(i1480u->rx_skb, untd_hdr_size + i1480u->rx_untd_pkt_size); - skb_pull(i1480u->rx_skb, untd_hdr_size + i1480u_hdr_size); - rx_buf->data = NULL; /* for hand off skb to network stack */ - pkt_completed = 1; - i1480u->rx_untd_pkt_size -= i1480u_hdr_size; /* accurate stat */ - break; - } - default: - i1480u_drop(i1480u, "RX: unknown packet type %u! " - "Dropping\n", untd_hdr_type(untd_hdr)); - goto out; - } - size_left -= untd_hdr_size + untd_frg_size; - if (size_left > 0) - ptr += untd_hdr_size + untd_frg_size; - } - if (pkt_completed) - i1480u_skb_deliver(i1480u); -out: - /* recreate needed RX buffers*/ - if (rx_buf->data == NULL) { - /* buffer is being used to receive packet, create new */ - new_skb = dev_alloc_skb(i1480u_MAX_RX_PKT_SIZE); - if (!new_skb) { - if (printk_ratelimit()) - dev_err(dev, - "RX: cannot allocate RX buffer\n"); - } else { - new_skb->dev = net_dev; - new_skb->ip_summed = CHECKSUM_NONE; - skb_reserve(new_skb, 2); - rx_buf->data = new_skb; - } - } - return; -} - - -/* - * Called when an RX URB has finished receiving or has found some kind - * of error condition. - * - * LIMITATIONS: - * - * - We read USB-transfers, each transfer contains a SINGLE fragment - * (can contain a complete packet, or a 1st, next, or last fragment - * of a packet). - * Looks like a transfer can contain more than one fragment (07/18/06) - * - * - Each transfer buffer is the size of the maximum packet size (minus - * headroom), i1480u_MAX_PKT_SIZE - 2 - * - * - We always read the full USB-transfer, no partials. - * - * - Each transfer is read directly into a skb. This skb will be used to - * send data to the upper layers if it is the first fragment or a complete - * packet. In the other cases the data will be copied from the skb to - * another skb that is being prepared for the upper layers from a prev - * first fragment. - * - * It is simply too much of a pain. Gosh, there should be a unified - * SG infrastructure for *everything* [so that I could declare a SG - * buffer, pass it to USB for receiving, append some space to it if - * I wish, receive more until I have the whole chunk, adapt - * pointers on each fragment to remove hardware headers and then - * attach that to an skbuff and netif_rx()]. - */ -void i1480u_rx_cb(struct urb *urb) -{ - int result; - int do_parse_buffer = 1; - struct i1480u_rx_buf *rx_buf = urb->context; - struct i1480u *i1480u = rx_buf->i1480u; - struct device *dev = &i1480u->usb_iface->dev; - unsigned long flags; - u8 rx_buf_idx = rx_buf - i1480u->rx_buf; - - switch (urb->status) { - case 0: - break; - case -ECONNRESET: /* Not an error, but a controlled situation; */ - case -ENOENT: /* (we killed the URB)...so, no broadcast */ - case -ESHUTDOWN: /* going away! */ - dev_err(dev, "RX URB[%u]: goind down %d\n", - rx_buf_idx, urb->status); - goto error; - default: - dev_err(dev, "RX URB[%u]: unknown status %d\n", - rx_buf_idx, urb->status); - if (edc_inc(&i1480u->rx_errors, EDC_MAX_ERRORS, - EDC_ERROR_TIMEFRAME)) { - dev_err(dev, "RX: max acceptable errors exceeded," - " resetting device.\n"); - i1480u_rx_unlink_urbs(i1480u); - wlp_reset_all(&i1480u->wlp); - goto error; - } - do_parse_buffer = 0; - break; - } - spin_lock_irqsave(&i1480u->lock, flags); - /* chew the data fragments, extract network packets */ - if (do_parse_buffer) { - i1480u_rx_buffer(rx_buf); - if (rx_buf->data) { - rx_buf->urb->transfer_buffer = rx_buf->data->data; - result = usb_submit_urb(rx_buf->urb, GFP_ATOMIC); - if (result < 0) { - dev_err(dev, "RX URB[%u]: cannot submit %d\n", - rx_buf_idx, result); - } - } - } - spin_unlock_irqrestore(&i1480u->lock, flags); -error: - return; -} - |