From bb9f8692f5043efef0dcef048cdd1db68299c2cb Mon Sep 17 00:00:00 2001 From: Zhu Yi Date: Thu, 21 May 2009 21:20:45 +0800 Subject: iwmc3200wifi: Add new Intel Wireless Multicomm 802.11 driver This driver supports Intel's full MAC wireless multicomm 802.11 hardware. Although the hardware is a 802.11agn device, we currently only support 802.11ag, in managed and ad-hoc mode (no AP mode for now). Signed-off-by: Zhu Yi Signed-off-by: Samuel Ortiz Signed-off-by: John W. Linville --- drivers/net/wireless/iwmc3200wifi/tx.c | 492 +++++++++++++++++++++++++++++++++ 1 file changed, 492 insertions(+) create mode 100644 drivers/net/wireless/iwmc3200wifi/tx.c (limited to 'drivers/net/wireless/iwmc3200wifi/tx.c') diff --git a/drivers/net/wireless/iwmc3200wifi/tx.c b/drivers/net/wireless/iwmc3200wifi/tx.c new file mode 100644 index 000000000000..e3b4f7902daf --- /dev/null +++ b/drivers/net/wireless/iwmc3200wifi/tx.c @@ -0,0 +1,492 @@ +/* + * 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 + * Samuel Ortiz + * Zhu Yi + * + */ + +/* + * 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 +#include +#include + +#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 avaliable 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 int 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 0; +} + +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); + + ret = iwm_bus_send_chunk(iwm, txq->concat_buf, txq->concat_count); + + txq->concat_count = 0; + txq->concat_ptr = txq->concat_buf; + + return ret; +} + +#define CONFIG_IWM_TX_CONCATENATED 1 + +void iwm_tx_worker(struct work_struct *work) +{ + struct iwm_priv *iwm; + struct iwm_tx_info *tx_info = NULL; + struct sk_buff *skb; + int cmdlen, ret; + struct iwm_tx_queue *txq; + int 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)) { + + skb = skb_dequeue(&txq->queue); + tx_info = skb_to_tx_info(skb); + 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 !CONFIG_IWM_TX_CONCATENATED + /* temporarily keep this to comparing the performance */ + ret = iwm_send_packet(iwm, skb, pool_id); +#else + + 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); + skb_queue_head(&txq->queue, skb); + break; + } + + txq->concat_ptr = txq->concat_buf + txq->concat_count; + iwm_tx_build_packet(iwm, skb, pool_id, txq->concat_ptr); + txq->concat_count += ALIGN(cmdlen, 16); +#endif + 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 net_device *ndev = iwm_to_ndev(iwm); + struct wireless_dev *wdev = iwm_to_wdev(iwm); + u8 *dst_addr; + struct iwm_tx_info *tx_info; + struct iwm_tx_queue *txq; + struct iwm_sta_info *sta_info; + u8 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) { + 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; + + skb_queue_tail(&iwm->txq[queue].queue, skb); + + queue_work(iwm->txq[queue].wq, &iwm->txq[queue].worker); + + ndev->stats.tx_packets++; + ndev->stats.tx_bytes += skb->len; + return NETDEV_TX_OK; + + drop: + ndev->stats.tx_dropped++; + dev_kfree_skb_any(skb); + return NETDEV_TX_OK; +} -- cgit v1.2.3