From 683b95e8071603b4e945cb26dcae0308457ec478 Mon Sep 17 00:00:00 2001 From: Peter Oh Date: Mon, 5 Oct 2015 17:56:40 +0300 Subject: [PATCH] ath10k: use pre-allocated DMA buffer in Tx ath10k driver is using dma_pool_alloc per packet and dma_pool_free in coresponding at Tx completion. Use of pre-allocated DMA buffer in Tx will improve saving CPU resource by 5% while it consumes about 56KB memory more as trade off. Signed-off-by: Peter Oh Signed-off-by: Kalle Valo --- drivers/net/wireless/ath/ath10k/htt.h | 6 +++- drivers/net/wireless/ath/ath10k/htt_tx.c | 43 +++++++++++++----------- drivers/net/wireless/ath/ath10k/txrx.c | 5 --- 3 files changed, 28 insertions(+), 26 deletions(-) diff --git a/drivers/net/wireless/ath/ath10k/htt.h b/drivers/net/wireless/ath/ath10k/htt.h index 5a8e4eae7a9c..db0a99b4e9d9 100644 --- a/drivers/net/wireless/ath/ath10k/htt.h +++ b/drivers/net/wireless/ath/ath10k/htt.h @@ -1488,7 +1488,6 @@ struct ath10k_htt { int num_pending_mgmt_tx; struct idr pending_tx; wait_queue_head_t empty_tx_wq; - struct dma_pool *tx_pool; /* set if host-fw communication goes haywire * used to avoid further failures */ @@ -1509,6 +1508,11 @@ struct ath10k_htt { dma_addr_t paddr; struct htt_msdu_ext_desc *vaddr; } frag_desc; + + struct { + dma_addr_t paddr; + struct ath10k_htt_txbuf *vaddr; + } txbuf; }; #define RX_HTT_HDR_STATUS_LEN 64 diff --git a/drivers/net/wireless/ath/ath10k/htt_tx.c b/drivers/net/wireless/ath/ath10k/htt_tx.c index a31d508fc397..555174756eb1 100644 --- a/drivers/net/wireless/ath/ath10k/htt_tx.c +++ b/drivers/net/wireless/ath/ath10k/htt_tx.c @@ -108,9 +108,12 @@ int ath10k_htt_tx_alloc(struct ath10k_htt *htt) spin_lock_init(&htt->tx_lock); idr_init(&htt->pending_tx); - htt->tx_pool = dma_pool_create("ath10k htt tx pool", htt->ar->dev, - sizeof(struct ath10k_htt_txbuf), 4, 0); - if (!htt->tx_pool) { + size = htt->max_num_pending_tx * sizeof(struct ath10k_htt_txbuf); + htt->txbuf.vaddr = dma_alloc_coherent(ar->dev, size, + &htt->txbuf.paddr, + GFP_DMA); + if (!htt->txbuf.vaddr) { + ath10k_err(ar, "failed to alloc tx buffer\n"); ret = -ENOMEM; goto free_idr_pending_tx; } @@ -125,14 +128,17 @@ int ath10k_htt_tx_alloc(struct ath10k_htt *htt) if (!htt->frag_desc.vaddr) { ath10k_warn(ar, "failed to alloc fragment desc memory\n"); ret = -ENOMEM; - goto free_tx_pool; + goto free_txbuf; } skip_frag_desc_alloc: return 0; -free_tx_pool: - dma_pool_destroy(htt->tx_pool); +free_txbuf: + size = htt->max_num_pending_tx * + sizeof(struct ath10k_htt_txbuf); + dma_free_coherent(htt->ar->dev, size, htt->txbuf.vaddr, + htt->txbuf.paddr); free_idr_pending_tx: idr_destroy(&htt->pending_tx); return ret; @@ -160,7 +166,13 @@ void ath10k_htt_tx_free(struct ath10k_htt *htt) idr_for_each(&htt->pending_tx, ath10k_htt_tx_clean_up_pending, htt->ar); idr_destroy(&htt->pending_tx); - dma_pool_destroy(htt->tx_pool); + + if (htt->txbuf.vaddr) { + size = htt->max_num_pending_tx * + sizeof(struct ath10k_htt_txbuf); + dma_free_coherent(htt->ar->dev, size, htt->txbuf.vaddr, + htt->txbuf.paddr); + } if (htt->frag_desc.vaddr) { size = htt->max_num_pending_tx * @@ -521,7 +533,6 @@ int ath10k_htt_tx(struct ath10k_htt *htt, struct sk_buff *msdu) int res; u8 flags0 = 0; u16 msdu_id, flags1 = 0; - dma_addr_t paddr = 0; u32 frags_paddr = 0; struct htt_msdu_ext_desc *ext_desc = NULL; bool limit_mgmt_desc = false; @@ -550,13 +561,9 @@ int ath10k_htt_tx(struct ath10k_htt *htt, struct sk_buff *msdu) prefetch_len = min(htt->prefetch_len, msdu->len); prefetch_len = roundup(prefetch_len, 4); - skb_cb->htt.txbuf = dma_pool_alloc(htt->tx_pool, GFP_ATOMIC, - &paddr); - if (!skb_cb->htt.txbuf) { - res = -ENOMEM; - goto err_free_msdu_id; - } - skb_cb->htt.txbuf_paddr = paddr; + skb_cb->htt.txbuf = &htt->txbuf.vaddr[msdu_id]; + skb_cb->htt.txbuf_paddr = htt->txbuf.paddr + + (sizeof(struct ath10k_htt_txbuf) * msdu_id); if ((ieee80211_is_action(hdr->frame_control) || ieee80211_is_deauth(hdr->frame_control) || @@ -574,7 +581,7 @@ int ath10k_htt_tx(struct ath10k_htt *htt, struct sk_buff *msdu) res = dma_mapping_error(dev, skb_cb->paddr); if (res) { res = -EIO; - goto err_free_txbuf; + goto err_free_msdu_id; } switch (skb_cb->txmode) { @@ -706,10 +713,6 @@ int ath10k_htt_tx(struct ath10k_htt *htt, struct sk_buff *msdu) err_unmap_msdu: dma_unmap_single(dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE); -err_free_txbuf: - dma_pool_free(htt->tx_pool, - skb_cb->htt.txbuf, - skb_cb->htt.txbuf_paddr); err_free_msdu_id: spin_lock_bh(&htt->tx_lock); ath10k_htt_tx_free_msdu_id(htt, msdu_id); diff --git a/drivers/net/wireless/ath/ath10k/txrx.c b/drivers/net/wireless/ath/ath10k/txrx.c index 7db7d501726b..6d1105ab4592 100644 --- a/drivers/net/wireless/ath/ath10k/txrx.c +++ b/drivers/net/wireless/ath/ath10k/txrx.c @@ -92,11 +92,6 @@ void ath10k_txrx_tx_unref(struct ath10k_htt *htt, skb_cb = ATH10K_SKB_CB(msdu); dma_unmap_single(dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE); - if (skb_cb->htt.txbuf) - dma_pool_free(htt->tx_pool, - skb_cb->htt.txbuf, - skb_cb->htt.txbuf_paddr); - ath10k_report_offchan_tx(htt->ar, msdu); info = IEEE80211_SKB_CB(msdu);