summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/iwmc3200wifi/tx.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/net/wireless/iwmc3200wifi/tx.c')
-rw-r--r--drivers/net/wireless/iwmc3200wifi/tx.c529
1 files changed, 0 insertions, 529 deletions
diff --git a/drivers/net/wireless/iwmc3200wifi/tx.c b/drivers/net/wireless/iwmc3200wifi/tx.c
deleted file mode 100644
index be98074..0000000
--- a/drivers/net/wireless/iwmc3200wifi/tx.c
+++ /dev/null
@@ -1,529 +0,0 @@
-/*
- * Intel Wireless Multicomm 3200 WiFi driver
- *
- * Copyright (C) 2009 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 <ilw@linux.intel.com>
- * Samuel Ortiz <samuel.ortiz@intel.com>
- * Zhu Yi <yi.zhu@intel.com>
- *
- */
-
-/*
- * iwm Tx theory of operation:
- *
- * 1) We receive a 802.3 frame from the stack
- * 2) We convert it to a 802.11 frame [iwm_xmit_frame]
- * 3) We queue it to its corresponding tx queue [iwm_xmit_frame]
- * 4) We schedule the tx worker. There is one worker per tx
- * queue. [iwm_xmit_frame]
- * 5) The tx worker is scheduled
- * 6) We go through every queued skb on the tx queue, and for each
- * and every one of them: [iwm_tx_worker]
- * a) We check if we have enough Tx credits (see below for a Tx
- * credits description) for the frame length. [iwm_tx_worker]
- * b) If we do, we aggregate the Tx frame into a UDMA one, by
- * concatenating one REPLY_TX command per Tx frame. [iwm_tx_worker]
- * c) When we run out of credits, or when we reach the maximum
- * concatenation size, we actually send the concatenated UDMA
- * frame. [iwm_tx_worker]
- *
- * When we run out of Tx credits, the skbs are filling the tx queue,
- * and eventually we will stop the netdev queue. [iwm_tx_worker]
- * The tx queue is emptied as we're getting new tx credits, by
- * scheduling the tx_worker. [iwm_tx_credit_inc]
- * The netdev queue is started again when we have enough tx credits,
- * and when our tx queue has some reasonable amout of space available
- * (i.e. half of the max size). [iwm_tx_worker]
- */
-
-#include <linux/slab.h>
-#include <linux/skbuff.h>
-#include <linux/netdevice.h>
-#include <linux/ieee80211.h>
-
-#include "iwm.h"
-#include "debug.h"
-#include "commands.h"
-#include "hal.h"
-#include "umac.h"
-#include "bus.h"
-
-#define IWM_UMAC_PAGE_ALLOC_WRAP 0xffff
-
-#define BYTES_TO_PAGES(n) (1 + ((n) >> ilog2(IWM_UMAC_PAGE_SIZE)) - \
- (((n) & (IWM_UMAC_PAGE_SIZE - 1)) == 0))
-
-#define pool_id_to_queue(id) ((id < IWM_TX_CMD_QUEUE) ? id : id - 1)
-#define queue_to_pool_id(q) ((q < IWM_TX_CMD_QUEUE) ? q : q + 1)
-
-/* require to hold tx_credit lock */
-static int iwm_tx_credit_get(struct iwm_tx_credit *tx_credit, int id)
-{
- struct pool_entry *pool = &tx_credit->pools[id];
- struct spool_entry *spool = &tx_credit->spools[pool->sid];
- int spool_pages;
-
- /* number of pages can be taken from spool by this pool */
- spool_pages = spool->max_pages - spool->alloc_pages +
- max(pool->min_pages - pool->alloc_pages, 0);
-
- return min(pool->max_pages - pool->alloc_pages, spool_pages);
-}
-
-static bool iwm_tx_credit_ok(struct iwm_priv *iwm, int id, int nb)
-{
- u32 npages = BYTES_TO_PAGES(nb);
-
- if (npages <= iwm_tx_credit_get(&iwm->tx_credit, id))
- return 1;
-
- set_bit(id, &iwm->tx_credit.full_pools_map);
-
- IWM_DBG_TX(iwm, DBG, "LINK: stop txq[%d], available credit: %d\n",
- pool_id_to_queue(id),
- iwm_tx_credit_get(&iwm->tx_credit, id));
-
- return 0;
-}
-
-void iwm_tx_credit_inc(struct iwm_priv *iwm, int id, int total_freed_pages)
-{
- struct pool_entry *pool;
- struct spool_entry *spool;
- int freed_pages;
- int queue;
-
- BUG_ON(id >= IWM_MACS_OUT_GROUPS);
-
- pool = &iwm->tx_credit.pools[id];
- spool = &iwm->tx_credit.spools[pool->sid];
-
- freed_pages = total_freed_pages - pool->total_freed_pages;
- IWM_DBG_TX(iwm, DBG, "Free %d pages for pool[%d]\n", freed_pages, id);
-
- if (!freed_pages) {
- IWM_DBG_TX(iwm, DBG, "No pages are freed by UMAC\n");
- return;
- } else if (freed_pages < 0)
- freed_pages += IWM_UMAC_PAGE_ALLOC_WRAP + 1;
-
- if (pool->alloc_pages > pool->min_pages) {
- int spool_pages = pool->alloc_pages - pool->min_pages;
- spool_pages = min(spool_pages, freed_pages);
- spool->alloc_pages -= spool_pages;
- }
-
- pool->alloc_pages -= freed_pages;
- pool->total_freed_pages = total_freed_pages;
-
- IWM_DBG_TX(iwm, DBG, "Pool[%d] pages alloc: %d, total_freed: %d, "
- "Spool[%d] pages alloc: %d\n", id, pool->alloc_pages,
- pool->total_freed_pages, pool->sid, spool->alloc_pages);
-
- if (test_bit(id, &iwm->tx_credit.full_pools_map) &&
- (pool->alloc_pages < pool->max_pages / 2)) {
- clear_bit(id, &iwm->tx_credit.full_pools_map);
-
- queue = pool_id_to_queue(id);
-
- IWM_DBG_TX(iwm, DBG, "LINK: start txq[%d], available "
- "credit: %d\n", queue,
- iwm_tx_credit_get(&iwm->tx_credit, id));
- queue_work(iwm->txq[queue].wq, &iwm->txq[queue].worker);
- }
-}
-
-static void iwm_tx_credit_dec(struct iwm_priv *iwm, int id, int alloc_pages)
-{
- struct pool_entry *pool;
- struct spool_entry *spool;
- int spool_pages;
-
- IWM_DBG_TX(iwm, DBG, "Allocate %d pages for pool[%d]\n",
- alloc_pages, id);
-
- BUG_ON(id >= IWM_MACS_OUT_GROUPS);
-
- pool = &iwm->tx_credit.pools[id];
- spool = &iwm->tx_credit.spools[pool->sid];
-
- spool_pages = pool->alloc_pages + alloc_pages - pool->min_pages;
-
- if (pool->alloc_pages >= pool->min_pages)
- spool->alloc_pages += alloc_pages;
- else if (spool_pages > 0)
- spool->alloc_pages += spool_pages;
-
- pool->alloc_pages += alloc_pages;
-
- IWM_DBG_TX(iwm, DBG, "Pool[%d] pages alloc: %d, total_freed: %d, "
- "Spool[%d] pages alloc: %d\n", id, pool->alloc_pages,
- pool->total_freed_pages, pool->sid, spool->alloc_pages);
-}
-
-int iwm_tx_credit_alloc(struct iwm_priv *iwm, int id, int nb)
-{
- u32 npages = BYTES_TO_PAGES(nb);
- int ret = 0;
-
- spin_lock(&iwm->tx_credit.lock);
-
- if (!iwm_tx_credit_ok(iwm, id, nb)) {
- IWM_DBG_TX(iwm, DBG, "No credit available for pool[%d]\n", id);
- ret = -ENOSPC;
- goto out;
- }
-
- iwm_tx_credit_dec(iwm, id, npages);
-
- out:
- spin_unlock(&iwm->tx_credit.lock);
- return ret;
-}
-
-/*
- * Since we're on an SDIO or USB bus, we are not sharing memory
- * for storing to be transmitted frames. The host needs to push
- * them upstream. As a consequence there needs to be a way for
- * the target to let us know if it can actually take more TX frames
- * or not. This is what Tx credits are for.
- *
- * For each Tx HW queue, we have a Tx pool, and then we have one
- * unique super pool (spool), which is actually a global pool of
- * all the UMAC pages.
- * For each Tx pool we have a min_pages, a max_pages fields, and a
- * alloc_pages fields. The alloc_pages tracks the number of pages
- * currently allocated from the tx pool.
- * Here are the rules to check if given a tx frame we have enough
- * tx credits for it:
- * 1) We translate the frame length into a number of UMAC pages.
- * Let's call them n_pages.
- * 2) For the corresponding tx pool, we check if n_pages +
- * pool->alloc_pages is higher than pool->min_pages. min_pages
- * represent a set of pre-allocated pages on the tx pool. If
- * that's the case, then we need to allocate those pages from
- * the spool. We can do so until we reach spool->max_pages.
- * 3) Each tx pool is not allowed to allocate more than pool->max_pages
- * from the spool, so once we're over min_pages, we can allocate
- * pages from the spool, but not more than max_pages.
- *
- * When the tx code path needs to send a tx frame, it checks first
- * if it has enough tx credits, following those rules. [iwm_tx_credit_get]
- * If it does, it then updates the pool and spool counters and
- * then send the frame. [iwm_tx_credit_alloc and iwm_tx_credit_dec]
- * On the other side, when the UMAC is done transmitting frames, it
- * will send a credit update notification to the host. This is when
- * the pool and spool counters gets to be decreased. [iwm_tx_credit_inc,
- * called from rx.c:iwm_ntf_tx_credit_update]
- *
- */
-void iwm_tx_credit_init_pools(struct iwm_priv *iwm,
- struct iwm_umac_notif_alive *alive)
-{
- int i, sid, pool_pages;
-
- spin_lock(&iwm->tx_credit.lock);
-
- iwm->tx_credit.pool_nr = le16_to_cpu(alive->page_grp_count);
- iwm->tx_credit.full_pools_map = 0;
- memset(&iwm->tx_credit.spools[0], 0, sizeof(struct spool_entry));
-
- IWM_DBG_TX(iwm, DBG, "Pools number is %d\n", iwm->tx_credit.pool_nr);
-
- for (i = 0; i < iwm->tx_credit.pool_nr; i++) {
- __le32 page_grp_state = alive->page_grp_state[i];
-
- iwm->tx_credit.pools[i].id = GET_VAL32(page_grp_state,
- UMAC_ALIVE_PAGE_STS_GRP_NUM);
- iwm->tx_credit.pools[i].sid = GET_VAL32(page_grp_state,
- UMAC_ALIVE_PAGE_STS_SGRP_NUM);
- iwm->tx_credit.pools[i].min_pages = GET_VAL32(page_grp_state,
- UMAC_ALIVE_PAGE_STS_GRP_MIN_SIZE);
- iwm->tx_credit.pools[i].max_pages = GET_VAL32(page_grp_state,
- UMAC_ALIVE_PAGE_STS_GRP_MAX_SIZE);
- iwm->tx_credit.pools[i].alloc_pages = 0;
- iwm->tx_credit.pools[i].total_freed_pages = 0;
-
- sid = iwm->tx_credit.pools[i].sid;
- pool_pages = iwm->tx_credit.pools[i].min_pages;
-
- if (iwm->tx_credit.spools[sid].max_pages == 0) {
- iwm->tx_credit.spools[sid].id = sid;
- iwm->tx_credit.spools[sid].max_pages =
- GET_VAL32(page_grp_state,
- UMAC_ALIVE_PAGE_STS_SGRP_MAX_SIZE);
- iwm->tx_credit.spools[sid].alloc_pages = 0;
- }
-
- iwm->tx_credit.spools[sid].alloc_pages += pool_pages;
-
- IWM_DBG_TX(iwm, DBG, "Pool idx: %d, id: %d, sid: %d, capacity "
- "min: %d, max: %d, pool alloc: %d, total_free: %d, "
- "super poll alloc: %d\n",
- i, iwm->tx_credit.pools[i].id,
- iwm->tx_credit.pools[i].sid,
- iwm->tx_credit.pools[i].min_pages,
- iwm->tx_credit.pools[i].max_pages,
- iwm->tx_credit.pools[i].alloc_pages,
- iwm->tx_credit.pools[i].total_freed_pages,
- iwm->tx_credit.spools[sid].alloc_pages);
- }
-
- spin_unlock(&iwm->tx_credit.lock);
-}
-
-#define IWM_UDMA_HDR_LEN sizeof(struct iwm_umac_wifi_out_hdr)
-
-static __le16 iwm_tx_build_packet(struct iwm_priv *iwm, struct sk_buff *skb,
- int pool_id, u8 *buf)
-{
- struct iwm_umac_wifi_out_hdr *hdr = (struct iwm_umac_wifi_out_hdr *)buf;
- struct iwm_udma_wifi_cmd udma_cmd;
- struct iwm_umac_cmd umac_cmd;
- struct iwm_tx_info *tx_info = skb_to_tx_info(skb);
-
- udma_cmd.count = cpu_to_le16(skb->len +
- sizeof(struct iwm_umac_fw_cmd_hdr));
- /* set EOP to 0 here. iwm_udma_wifi_hdr_set_eop() will be
- * called later to set EOP for the last packet. */
- udma_cmd.eop = 0;
- udma_cmd.credit_group = pool_id;
- udma_cmd.ra_tid = tx_info->sta << 4 | tx_info->tid;
- udma_cmd.lmac_offset = 0;
-
- umac_cmd.id = REPLY_TX;
- umac_cmd.count = cpu_to_le16(skb->len);
- umac_cmd.color = tx_info->color;
- umac_cmd.resp = 0;
- umac_cmd.seq_num = cpu_to_le16(iwm_alloc_wifi_cmd_seq(iwm));
-
- iwm_build_udma_wifi_hdr(iwm, &hdr->hw_hdr, &udma_cmd);
- iwm_build_umac_hdr(iwm, &hdr->sw_hdr, &umac_cmd);
-
- memcpy(buf + sizeof(*hdr), skb->data, skb->len);
-
- return umac_cmd.seq_num;
-}
-
-static int iwm_tx_send_concat_packets(struct iwm_priv *iwm,
- struct iwm_tx_queue *txq)
-{
- int ret;
-
- if (!txq->concat_count)
- return 0;
-
- IWM_DBG_TX(iwm, DBG, "Send concatenated Tx: queue %d, %d bytes\n",
- txq->id, txq->concat_count);
-
- /* mark EOP for the last packet */
- iwm_udma_wifi_hdr_set_eop(iwm, txq->concat_ptr, 1);
-
- trace_iwm_tx_packets(iwm, txq->concat_buf, txq->concat_count);
- ret = iwm_bus_send_chunk(iwm, txq->concat_buf, txq->concat_count);
-
- txq->concat_count = 0;
- txq->concat_ptr = txq->concat_buf;
-
- return ret;
-}
-
-void iwm_tx_worker(struct work_struct *work)
-{
- struct iwm_priv *iwm;
- struct iwm_tx_info *tx_info = NULL;
- struct sk_buff *skb;
- struct iwm_tx_queue *txq;
- struct iwm_sta_info *sta_info;
- struct iwm_tid_info *tid_info;
- int cmdlen, ret, pool_id;
-
- txq = container_of(work, struct iwm_tx_queue, worker);
- iwm = container_of(txq, struct iwm_priv, txq[txq->id]);
-
- pool_id = queue_to_pool_id(txq->id);
-
- while (!test_bit(pool_id, &iwm->tx_credit.full_pools_map) &&
- !skb_queue_empty(&txq->queue)) {
-
- spin_lock_bh(&txq->lock);
- skb = skb_dequeue(&txq->queue);
- spin_unlock_bh(&txq->lock);
-
- tx_info = skb_to_tx_info(skb);
- sta_info = &iwm->sta_table[tx_info->sta];
- if (!sta_info->valid) {
- IWM_ERR(iwm, "Trying to send a frame to unknown STA\n");
- kfree_skb(skb);
- continue;
- }
-
- tid_info = &sta_info->tid_info[tx_info->tid];
-
- mutex_lock(&tid_info->mutex);
-
- /*
- * If the RAxTID is stopped, we queue the skb to the stopped
- * queue.
- * Whenever we'll get a UMAC notification to resume the tx flow
- * for this RAxTID, we'll merge back the stopped queue into the
- * regular queue. See iwm_ntf_stop_resume_tx() from rx.c.
- */
- if (tid_info->stopped) {
- IWM_DBG_TX(iwm, DBG, "%dx%d stopped\n",
- tx_info->sta, tx_info->tid);
- spin_lock_bh(&txq->lock);
- skb_queue_tail(&txq->stopped_queue, skb);
- spin_unlock_bh(&txq->lock);
-
- mutex_unlock(&tid_info->mutex);
- continue;
- }
-
- cmdlen = IWM_UDMA_HDR_LEN + skb->len;
-
- IWM_DBG_TX(iwm, DBG, "Tx frame on queue %d: skb: 0x%p, sta: "
- "%d, color: %d\n", txq->id, skb, tx_info->sta,
- tx_info->color);
-
- if (txq->concat_count + cmdlen > IWM_HAL_CONCATENATE_BUF_SIZE)
- iwm_tx_send_concat_packets(iwm, txq);
-
- ret = iwm_tx_credit_alloc(iwm, pool_id, cmdlen);
- if (ret) {
- IWM_DBG_TX(iwm, DBG, "not enough tx_credit for queue "
- "%d, Tx worker stopped\n", txq->id);
- spin_lock_bh(&txq->lock);
- skb_queue_head(&txq->queue, skb);
- spin_unlock_bh(&txq->lock);
-
- mutex_unlock(&tid_info->mutex);
- break;
- }
-
- txq->concat_ptr = txq->concat_buf + txq->concat_count;
- tid_info->last_seq_num =
- iwm_tx_build_packet(iwm, skb, pool_id, txq->concat_ptr);
- txq->concat_count += ALIGN(cmdlen, 16);
-
- mutex_unlock(&tid_info->mutex);
-
- kfree_skb(skb);
- }
-
- iwm_tx_send_concat_packets(iwm, txq);
-
- if (__netif_subqueue_stopped(iwm_to_ndev(iwm), txq->id) &&
- !test_bit(pool_id, &iwm->tx_credit.full_pools_map) &&
- (skb_queue_len(&txq->queue) < IWM_TX_LIST_SIZE / 2)) {
- IWM_DBG_TX(iwm, DBG, "LINK: start netif_subqueue[%d]", txq->id);
- netif_wake_subqueue(iwm_to_ndev(iwm), txq->id);
- }
-}
-
-int iwm_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
-{
- struct iwm_priv *iwm = ndev_to_iwm(netdev);
- struct wireless_dev *wdev = iwm_to_wdev(iwm);
- struct iwm_tx_info *tx_info;
- struct iwm_tx_queue *txq;
- struct iwm_sta_info *sta_info;
- u8 *dst_addr, sta_id;
- u16 queue;
- int ret;
-
-
- if (!test_bit(IWM_STATUS_ASSOCIATED, &iwm->status)) {
- IWM_DBG_TX(iwm, DBG, "LINK: stop netif_all_queues: "
- "not associated\n");
- netif_tx_stop_all_queues(netdev);
- goto drop;
- }
-
- queue = skb_get_queue_mapping(skb);
- BUG_ON(queue >= IWM_TX_DATA_QUEUES); /* no iPAN yet */
-
- txq = &iwm->txq[queue];
-
- /* No free space for Tx, tx_worker is too slow */
- if ((skb_queue_len(&txq->queue) > IWM_TX_LIST_SIZE) ||
- (skb_queue_len(&txq->stopped_queue) > IWM_TX_LIST_SIZE)) {
- IWM_DBG_TX(iwm, DBG, "LINK: stop netif_subqueue[%d]\n", queue);
- netif_stop_subqueue(netdev, queue);
- return NETDEV_TX_BUSY;
- }
-
- ret = ieee80211_data_from_8023(skb, netdev->dev_addr, wdev->iftype,
- iwm->bssid, 0);
- if (ret) {
- IWM_ERR(iwm, "build wifi header failed\n");
- goto drop;
- }
-
- dst_addr = ((struct ieee80211_hdr *)(skb->data))->addr1;
-
- for (sta_id = 0; sta_id < IWM_STA_TABLE_NUM; sta_id++) {
- sta_info = &iwm->sta_table[sta_id];
- if (sta_info->valid &&
- !memcmp(dst_addr, sta_info->addr, ETH_ALEN))
- break;
- }
-
- if (sta_id == IWM_STA_TABLE_NUM) {
- IWM_ERR(iwm, "STA %pM not found in sta_table, Tx ignored\n",
- dst_addr);
- goto drop;
- }
-
- tx_info = skb_to_tx_info(skb);
- tx_info->sta = sta_id;
- tx_info->color = sta_info->color;
- /* UMAC uses TID 8 (vs. 0) for non QoS packets */
- if (sta_info->qos)
- tx_info->tid = skb->priority;
- else
- tx_info->tid = IWM_UMAC_MGMT_TID;
-
- spin_lock_bh(&iwm->txq[queue].lock);
- skb_queue_tail(&iwm->txq[queue].queue, skb);
- spin_unlock_bh(&iwm->txq[queue].lock);
-
- queue_work(iwm->txq[queue].wq, &iwm->txq[queue].worker);
-
- netdev->stats.tx_packets++;
- netdev->stats.tx_bytes += skb->len;
- return NETDEV_TX_OK;
-
- drop:
- netdev->stats.tx_dropped++;
- dev_kfree_skb_any(skb);
- return NETDEV_TX_OK;
-}
OpenPOWER on IntegriCloud