diff options
Diffstat (limited to 'drivers/net/wireless/iwmc3200wifi/tx.c')
| -rw-r--r-- | drivers/net/wireless/iwmc3200wifi/tx.c | 529 |
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 be98074c060..00000000000 --- 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; -} |