1 files changed, 570 insertions, 0 deletions

diff --git a/drivers/net/wireless/wl1251/tx.c b/drivers/net/wireless/wl1251/tx.c
new file mode 100644
index 000000000000..554b4f9a3d3e
--- /dev/null
+++ b/drivers/net/wireless/wl1251/tx.c
@@ -0,0 +1,570 @@
+/*
+ * This file is part of wl1251
+ *
+ * Copyright (c) 1998-2007 Texas Instruments Incorporated
+ * Copyright (C) 2008 Nokia Corporation
+ *
+ * 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 St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+#include "wl1251.h"
+#include "reg.h"
+#include "tx.h"
+#include "ps.h"
+#include "io.h"
+
+static bool wl1251_tx_double_buffer_busy(struct wl1251 *wl, u32 data_out_count)
+{
+        int used, data_in_count;
+
+        data_in_count = wl->data_in_count;
+
+        if (data_in_count < data_out_count)
+                /* data_in_count has wrapped */
+                data_in_count += TX_STATUS_DATA_OUT_COUNT_MASK + 1;
+
+        used = data_in_count - data_out_count;
+
+        WARN_ON(used < 0);
+        WARN_ON(used > DP_TX_PACKET_RING_CHUNK_NUM);
+
+        if (used >= DP_TX_PACKET_RING_CHUNK_NUM)
+                return true;
+        else
+                return false;
+}
+
+static int wl1251_tx_path_status(struct wl1251 *wl)
+{
+        u32 status, addr, data_out_count;
+        bool busy;
+
+        addr = wl->data_path->tx_control_addr;
+        status = wl1251_mem_read32(wl, addr);
+        data_out_count = status & TX_STATUS_DATA_OUT_COUNT_MASK;
+        busy = wl1251_tx_double_buffer_busy(wl, data_out_count);
+
+        if (busy)
+                return -EBUSY;
+
+        return 0;
+}
+
+static int wl1251_tx_id(struct wl1251 *wl, struct sk_buff *skb)
+{
+        int i;
+
+        for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; i++)
+                if (wl->tx_frames[i] == NULL) {
+                        wl->tx_frames[i] = skb;
+                        return i;
+                }
+
+        return -EBUSY;
+}
+
+static void wl1251_tx_control(struct tx_double_buffer_desc *tx_hdr,
+                              struct ieee80211_tx_info *control, u16 fc)
+{
+        *(u16 *)&tx_hdr->control = 0;
+
+        tx_hdr->control.rate_policy = 0;
+
+        /* 802.11 packets */
+        tx_hdr->control.packet_type = 0;
+
+        if (control->flags & IEEE80211_TX_CTL_NO_ACK)
+                tx_hdr->control.ack_policy = 1;
+
+        tx_hdr->control.tx_complete = 1;
+
+        if ((fc & IEEE80211_FTYPE_DATA) &&
+            ((fc & IEEE80211_STYPE_QOS_DATA) ||
+             (fc & IEEE80211_STYPE_QOS_NULLFUNC)))
+                tx_hdr->control.qos = 1;
+}
+
+/* RSN + MIC = 8 + 8 = 16 bytes (worst case - AES). */
+#define MAX_MSDU_SECURITY_LENGTH      16
+#define MAX_MPDU_SECURITY_LENGTH      16
+#define WLAN_QOS_HDR_LEN              26
+#define MAX_MPDU_HEADER_AND_SECURITY  (MAX_MPDU_SECURITY_LENGTH + \
+                                       WLAN_QOS_HDR_LEN)
+#define HW_BLOCK_SIZE                 252
+static void wl1251_tx_frag_block_num(struct tx_double_buffer_desc *tx_hdr)
+{
+        u16 payload_len, frag_threshold, mem_blocks;
+        u16 num_mpdus, mem_blocks_per_frag;
+
+        frag_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
+        tx_hdr->frag_threshold = cpu_to_le16(frag_threshold);
+
+        payload_len = le16_to_cpu(tx_hdr->length) + MAX_MSDU_SECURITY_LENGTH;
+
+        if (payload_len > frag_threshold) {
+                mem_blocks_per_frag =
+                        ((frag_threshold + MAX_MPDU_HEADER_AND_SECURITY) /
+                         HW_BLOCK_SIZE) + 1;
+                num_mpdus = payload_len / frag_threshold;
+                mem_blocks = num_mpdus * mem_blocks_per_frag;
+                payload_len -= num_mpdus * frag_threshold;
+                num_mpdus++;
+
+        } else {
+                mem_blocks_per_frag = 0;
+                mem_blocks = 0;
+                num_mpdus = 1;
+        }
+
+        mem_blocks += (payload_len / HW_BLOCK_SIZE) + 1;
+
+        if (num_mpdus > 1)
+                mem_blocks += min(num_mpdus, mem_blocks_per_frag);
+
+        tx_hdr->num_mem_blocks = mem_blocks;
+}
+
+static int wl1251_tx_fill_hdr(struct wl1251 *wl, struct sk_buff *skb,
+                              struct ieee80211_tx_info *control)
+{
+        struct tx_double_buffer_desc *tx_hdr;
+        struct ieee80211_rate *rate;
+        int id;
+        u16 fc;
+
+        if (!skb)
+                return -EINVAL;
+
+        id = wl1251_tx_id(wl, skb);
+        if (id < 0)
+                return id;
+
+        fc = *(u16 *)skb->data;
+        tx_hdr = (struct tx_double_buffer_desc *) skb_push(skb,
+                                                           sizeof(*tx_hdr));
+
+        tx_hdr->length = cpu_to_le16(skb->len - sizeof(*tx_hdr));
+        rate = ieee80211_get_tx_rate(wl->hw, control);
+        tx_hdr->rate = cpu_to_le16(rate->hw_value);
+        tx_hdr->expiry_time = cpu_to_le32(1 << 16);
+        tx_hdr->id = id;
+
+        tx_hdr->xmit_queue = wl1251_tx_get_queue(skb_get_queue_mapping(skb));
+
+        wl1251_tx_control(tx_hdr, control, fc);
+        wl1251_tx_frag_block_num(tx_hdr);
+
+        return 0;
+}
+
+/* We copy the packet to the target */
+static int wl1251_tx_send_packet(struct wl1251 *wl, struct sk_buff *skb,
+                                 struct ieee80211_tx_info *control)
+{
+        struct tx_double_buffer_desc *tx_hdr;
+        int len;
+        u32 addr;
+
+        if (!skb)
+                return -EINVAL;
+
+        tx_hdr = (struct tx_double_buffer_desc *) skb->data;
+
+        if (control->control.hw_key &&
+            control->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
+                int hdrlen;
+                __le16 fc;
+                u16 length;
+                u8 *pos;
+
+                fc = *(__le16 *)(skb->data + sizeof(*tx_hdr));
+                length = le16_to_cpu(tx_hdr->length) + WL1251_TKIP_IV_SPACE;
+                tx_hdr->length = cpu_to_le16(length);
+
+                hdrlen = ieee80211_hdrlen(fc);
+
+                pos = skb_push(skb, WL1251_TKIP_IV_SPACE);
+                memmove(pos, pos + WL1251_TKIP_IV_SPACE,
+                        sizeof(*tx_hdr) + hdrlen);
+        }
+
+        /* Revisit. This is a workaround for getting non-aligned packets.
+           This happens at least with EAPOL packets from the user space.
+           Our DMA requires packets to be aligned on a 4-byte boundary.
+        */
+        if (unlikely((long)skb->data & 0x03)) {
+                int offset = (4 - (long)skb->data) & 0x03;
+                wl1251_debug(DEBUG_TX, "skb offset %d", offset);
+
+                /* check whether the current skb can be used */
+                if (!skb_cloned(skb) && (skb_tailroom(skb) >= offset)) {
+                        unsigned char *src = skb->data;
+
+                        /* align the buffer on a 4-byte boundary */
+                        skb_reserve(skb, offset);
+                        memmove(skb->data, src, skb->len);
+                        tx_hdr = (struct tx_double_buffer_desc *) skb->data;
+                } else {
+                        wl1251_info("No handler, fixme!");
+                        return -EINVAL;
+                }
+        }
+
+        /* Our skb->data at this point includes the HW header */
+        len = WL1251_TX_ALIGN(skb->len);
+
+        if (wl->data_in_count & 0x1)
+                addr = wl->data_path->tx_packet_ring_addr +
+                        wl->data_path->tx_packet_ring_chunk_size;
+        else
+                addr = wl->data_path->tx_packet_ring_addr;
+
+        wl1251_mem_write(wl, addr, skb->data, len);
+
+        wl1251_debug(DEBUG_TX, "tx id %u skb 0x%p payload %u rate 0x%x "
+                     "queue %d", tx_hdr->id, skb, tx_hdr->length,
+                     tx_hdr->rate, tx_hdr->xmit_queue);
+
+        return 0;
+}
+
+static void wl1251_tx_trigger(struct wl1251 *wl)
+{
+        u32 data, addr;
+
+        if (wl->data_in_count & 0x1) {
+                addr = ACX_REG_INTERRUPT_TRIG_H;
+                data = INTR_TRIG_TX_PROC1;
+        } else {
+                addr = ACX_REG_INTERRUPT_TRIG;
+                data = INTR_TRIG_TX_PROC0;
+        }
+
+        wl1251_reg_write32(wl, addr, data);
+
+        /* Bumping data in */
+        wl->data_in_count = (wl->data_in_count + 1) &
+                TX_STATUS_DATA_OUT_COUNT_MASK;
+}
+
+/* caller must hold wl->mutex */
+static int wl1251_tx_frame(struct wl1251 *wl, struct sk_buff *skb)
+{
+        struct ieee80211_tx_info *info;
+        int ret = 0;
+        u8 idx;
+
+        info = IEEE80211_SKB_CB(skb);
+
+        if (info->control.hw_key) {
+                idx = info->control.hw_key->hw_key_idx;
+                if (unlikely(wl->default_key != idx)) {
+                        ret = wl1251_acx_default_key(wl, idx);
+                        if (ret < 0)
+                                return ret;
+                }
+        }
+
+        ret = wl1251_tx_path_status(wl);
+        if (ret < 0)
+                return ret;
+
+        ret = wl1251_tx_fill_hdr(wl, skb, info);
+        if (ret < 0)
+                return ret;
+
+        ret = wl1251_tx_send_packet(wl, skb, info);
+        if (ret < 0)
+                return ret;
+
+        wl1251_tx_trigger(wl);
+
+        return ret;
+}
+
+void wl1251_tx_work(struct work_struct *work)
+{
+        struct wl1251 *wl = container_of(work, struct wl1251, tx_work);
+        struct sk_buff *skb;
+        bool woken_up = false;
+        int ret;
+
+        mutex_lock(&wl->mutex);
+
+        if (unlikely(wl->state == WL1251_STATE_OFF))
+                goto out;
+
+        while ((skb = skb_dequeue(&wl->tx_queue))) {
+                if (!woken_up) {
+                        ret = wl1251_ps_elp_wakeup(wl);
+                        if (ret < 0)
+                                goto out;
+                        woken_up = true;
+                }
+
+                ret = wl1251_tx_frame(wl, skb);
+                if (ret == -EBUSY) {
+                        skb_queue_head(&wl->tx_queue, skb);
+                        goto out;
+                } else if (ret < 0) {
+                        dev_kfree_skb(skb);
+                        goto out;
+                }
+        }
+
+out:
+        if (woken_up)
+                wl1251_ps_elp_sleep(wl);
+
+        mutex_unlock(&wl->mutex);
+}
+
+static const char *wl1251_tx_parse_status(u8 status)
+{
+        /* 8 bit status field, one character per bit plus null */
+        static char buf[9];
+        int i = 0;
+
+        memset(buf, 0, sizeof(buf));
+
+        if (status & TX_DMA_ERROR)
+                buf[i++] = 'm';
+        if (status & TX_DISABLED)
+                buf[i++] = 'd';
+        if (status & TX_RETRY_EXCEEDED)
+                buf[i++] = 'r';
+        if (status & TX_TIMEOUT)
+                buf[i++] = 't';
+        if (status & TX_KEY_NOT_FOUND)
+                buf[i++] = 'k';
+        if (status & TX_ENCRYPT_FAIL)
+                buf[i++] = 'e';
+        if (status & TX_UNAVAILABLE_PRIORITY)
+                buf[i++] = 'p';
+
+        /* bit 0 is unused apparently */
+
+        return buf;
+}
+
+static void wl1251_tx_packet_cb(struct wl1251 *wl,
+                                struct tx_result *result)
+{
+        struct ieee80211_tx_info *info;
+        struct sk_buff *skb;
+        int hdrlen, ret;
+        u8 *frame;
+
+        skb = wl->tx_frames[result->id];
+        if (skb == NULL) {
+                wl1251_error("SKB for packet %d is NULL", result->id);
+                return;
+        }
+
+        info = IEEE80211_SKB_CB(skb);
+
+        if (!(info->flags & IEEE80211_TX_CTL_NO_ACK) &&
+            (result->status == TX_SUCCESS))
+                info->flags |= IEEE80211_TX_STAT_ACK;
+
+        info->status.rates[0].count = result->ack_failures + 1;
+        wl->stats.retry_count += result->ack_failures;
+
+        /*
+         * We have to remove our private TX header before pushing
+         * the skb back to mac80211.
+         */
+        frame = skb_pull(skb, sizeof(struct tx_double_buffer_desc));
+        if (info->control.hw_key &&
+            info->control.hw_key->cipher == WLAN_CIPHER_SUITE_TKIP) {
+                hdrlen = ieee80211_get_hdrlen_from_skb(skb);
+                memmove(frame + WL1251_TKIP_IV_SPACE, frame, hdrlen);
+                skb_pull(skb, WL1251_TKIP_IV_SPACE);
+        }
+
+        wl1251_debug(DEBUG_TX, "tx status id %u skb 0x%p failures %u rate 0x%x"
+                     " status 0x%x (%s)",
+                     result->id, skb, result->ack_failures, result->rate,
+                     result->status, wl1251_tx_parse_status(result->status));
+
+
+        ieee80211_tx_status(wl->hw, skb);
+
+        wl->tx_frames[result->id] = NULL;
+
+        if (wl->tx_queue_stopped) {
+                wl1251_debug(DEBUG_TX, "cb: queue was stopped");
+
+                skb = skb_dequeue(&wl->tx_queue);
+
+                /* The skb can be NULL because tx_work might have been
+                   scheduled before the queue was stopped making the
+                   queue empty */
+
+                if (skb) {
+                        ret = wl1251_tx_frame(wl, skb);
+                        if (ret == -EBUSY) {
+                                /* firmware buffer is still full */
+                                wl1251_debug(DEBUG_TX, "cb: fw buffer "
+                                             "still full");
+                                skb_queue_head(&wl->tx_queue, skb);
+                                return;
+                        } else if (ret < 0) {
+                                dev_kfree_skb(skb);
+                                return;
+                        }
+                }
+
+                wl1251_debug(DEBUG_TX, "cb: waking queues");
+                ieee80211_wake_queues(wl->hw);
+                wl->tx_queue_stopped = false;
+        }
+}
+
+/* Called upon reception of a TX complete interrupt */
+void wl1251_tx_complete(struct wl1251 *wl)
+{
+        int i, result_index, num_complete = 0;
+        struct tx_result result[FW_TX_CMPLT_BLOCK_SIZE], *result_ptr;
+        unsigned long flags;
+
+        if (unlikely(wl->state != WL1251_STATE_ON))
+                return;
+
+        /* First we read the result */
+        wl1251_mem_read(wl, wl->data_path->tx_complete_addr,
+                            result, sizeof(result));
+
+        result_index = wl->next_tx_complete;
+
+        for (i = 0; i < ARRAY_SIZE(result); i++) {
+                result_ptr = &result[result_index];
+
+                if (result_ptr->done_1 == 1 &&
+                    result_ptr->done_2 == 1) {
+                        wl1251_tx_packet_cb(wl, result_ptr);
+
+                        result_ptr->done_1 = 0;
+                        result_ptr->done_2 = 0;
+
+                        result_index = (result_index + 1) &
+                                (FW_TX_CMPLT_BLOCK_SIZE - 1);
+                        num_complete++;
+                } else {
+                        break;
+                }
+        }
+
+        if (wl->tx_queue_stopped
+            &&
+            skb_queue_len(&wl->tx_queue) <= WL1251_TX_QUEUE_LOW_WATERMARK){
+
+                /* firmware buffer has space, restart queues */
+                wl1251_debug(DEBUG_TX, "tx_complete: waking queues");
+                spin_lock_irqsave(&wl->wl_lock, flags);
+                ieee80211_wake_queues(wl->hw);
+                wl->tx_queue_stopped = false;
+                spin_unlock_irqrestore(&wl->wl_lock, flags);
+                ieee80211_queue_work(wl->hw, &wl->tx_work);
+
+        }
+
+        /* Every completed frame needs to be acknowledged */
+        if (num_complete) {
+                /*
+                 * If we've wrapped, we have to clear
+                 * the results in 2 steps.
+                 */
+                if (result_index > wl->next_tx_complete) {
+                        /* Only 1 write is needed */
+                        wl1251_mem_write(wl,
+                                         wl->data_path->tx_complete_addr +
+                                         (wl->next_tx_complete *
+                                          sizeof(struct tx_result)),
+                                         &result[wl->next_tx_complete],
+                                         num_complete *
+                                         sizeof(struct tx_result));
+
+
+                } else if (result_index < wl->next_tx_complete) {
+                        /* 2 writes are needed */
+                        wl1251_mem_write(wl,
+                                         wl->data_path->tx_complete_addr +
+                                         (wl->next_tx_complete *
+                                          sizeof(struct tx_result)),
+                                         &result[wl->next_tx_complete],
+                                         (FW_TX_CMPLT_BLOCK_SIZE -
+                                          wl->next_tx_complete) *
+                                         sizeof(struct tx_result));
+
+                        wl1251_mem_write(wl,
+                                         wl->data_path->tx_complete_addr,
+                                         result,
+                                         (num_complete -
+                                          FW_TX_CMPLT_BLOCK_SIZE +
+                                          wl->next_tx_complete) *
+                                         sizeof(struct tx_result));
+
+                } else {
+                        /* We have to write the whole array */
+                        wl1251_mem_write(wl,
+                                         wl->data_path->tx_complete_addr,
+                                         result,
+                                         FW_TX_CMPLT_BLOCK_SIZE *
+                                         sizeof(struct tx_result));
+                }
+
+        }
+
+        wl->next_tx_complete = result_index;
+}
+
+/* caller must hold wl->mutex */
+void wl1251_tx_flush(struct wl1251 *wl)
+{
+        int i;
+        struct sk_buff *skb;
+        struct ieee80211_tx_info *info;
+
+        /* TX failure */
+/*      control->flags = 0; FIXME */
+
+        while ((skb = skb_dequeue(&wl->tx_queue))) {
+                info = IEEE80211_SKB_CB(skb);
+
+                wl1251_debug(DEBUG_TX, "flushing skb 0x%p", skb);
+
+                if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS))
+                                continue;
+
+                ieee80211_tx_status(wl->hw, skb);
+        }
+
+        for (i = 0; i < FW_TX_CMPLT_BLOCK_SIZE; i++)
+                if (wl->tx_frames[i] != NULL) {
+                        skb = wl->tx_frames[i];
+                        info = IEEE80211_SKB_CB(skb);
+
+                        if (!(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS))
+                                continue;
+
+                        ieee80211_tx_status(wl->hw, skb);
+                        wl->tx_frames[i] = NULL;
+                }
+}