Return-path: Received: from mail-lf0-f46.google.com ([209.85.215.46]:35656 "EHLO mail-lf0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752598AbbKJNNO (ORCPT ); Tue, 10 Nov 2015 08:13:14 -0500 Received: by lfdo63 with SMTP id o63so24426770lfd.2 for ; Tue, 10 Nov 2015 05:13:13 -0800 (PST) From: Michal Kazior To: ath10k@lists.infradead.org Cc: linux-wireless@vger.kernel.org, Michal Kazior Subject: [PATCH v2 9/9] ath10k: store msdu_id instead of txbuf pointers Date: Tue, 10 Nov 2015 14:10:55 +0100 Message-Id: <1447161055-2283-10-git-send-email-michal.kazior@tieto.com> (sfid-20151110_141344_550716_41CE4191) In-Reply-To: <1447161055-2283-1-git-send-email-michal.kazior@tieto.com> References: <1446472988-2603-1-git-send-email-michal.kazior@tieto.com> <1447161055-2283-1-git-send-email-michal.kazior@tieto.com> Sender: linux-wireless-owner@vger.kernel.org List-ID: Txbuf is no longer a DMA pool and can be easily tracked with a mere msdu_id. This saves 10 bytes on 64bit systems and 6 bytes on 32bit systems of precious sk_buff control buffer. Signed-off-by: Michal Kazior --- drivers/net/wireless/ath/ath10k/core.h | 6 +--- drivers/net/wireless/ath/ath10k/htt_tx.c | 53 ++++++++++++++++---------------- 2 files changed, 27 insertions(+), 32 deletions(-) diff --git a/drivers/net/wireless/ath/ath10k/core.h b/drivers/net/wireless/ath/ath10k/core.h index 8d17761ad101..15238efc1e4d 100644 --- a/drivers/net/wireless/ath/ath10k/core.h +++ b/drivers/net/wireless/ath/ath10k/core.h @@ -93,12 +93,8 @@ struct ath10k_skb_cb { dma_addr_t paddr; u8 flags; u8 eid; + u16 msdu_id; struct ieee80211_vif *vif; - - struct { - struct ath10k_htt_txbuf *txbuf; - u32 txbuf_paddr; - } __packed htt; } __packed; struct ath10k_skb_rxcb { diff --git a/drivers/net/wireless/ath/ath10k/htt_tx.c b/drivers/net/wireless/ath/ath10k/htt_tx.c index a337fb9328a9..5c440d6c4f11 100644 --- a/drivers/net/wireless/ath/ath10k/htt_tx.c +++ b/drivers/net/wireless/ath/ath10k/htt_tx.c @@ -539,8 +539,6 @@ int ath10k_htt_mgmt_tx(struct ath10k_htt *htt, struct sk_buff *msdu) memcpy(cmd->mgmt_tx.hdr, msdu->data, min_t(int, msdu->len, HTT_MGMT_FRM_HDR_DOWNLOAD_LEN)); - skb_cb->htt.txbuf = NULL; - res = ath10k_htc_send(&htt->ar->htc, htt->eid, txdesc); if (res) goto err_unmap_msdu; @@ -570,6 +568,7 @@ int ath10k_htt_tx(struct ath10k_htt *htt, enum ath10k_hw_txrx_mode txmode, struct ieee80211_tx_info *info = IEEE80211_SKB_CB(msdu); struct ath10k_skb_cb *skb_cb = ATH10K_SKB_CB(msdu); struct ath10k_hif_sg_item sg_items[2]; + struct ath10k_htt_txbuf *txbuf; struct htt_data_tx_desc_frag *frags; bool is_eth = (txmode == ATH10K_HW_TXRX_ETHERNET); u8 vdev_id = ath10k_htt_tx_get_vdev_id(ar, msdu); @@ -580,6 +579,7 @@ int ath10k_htt_tx(struct ath10k_htt *htt, enum ath10k_hw_txrx_mode txmode, u16 msdu_id, flags1 = 0; u16 freq = 0; u32 frags_paddr = 0; + u32 txbuf_paddr; struct htt_msdu_ext_desc *ext_desc = NULL; bool limit_mgmt_desc = false; bool is_probe_resp = false; @@ -607,9 +607,9 @@ int ath10k_htt_tx(struct ath10k_htt *htt, enum ath10k_hw_txrx_mode txmode, prefetch_len = min(htt->prefetch_len, msdu->len); prefetch_len = roundup(prefetch_len, 4); - skb_cb->htt.txbuf = &htt->txbuf.vaddr[msdu_id]; - skb_cb->htt.txbuf_paddr = htt->txbuf.paddr + - (sizeof(struct ath10k_htt_txbuf) * msdu_id); + txbuf = &htt->txbuf.vaddr[msdu_id]; + 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) || @@ -653,14 +653,14 @@ int ath10k_htt_tx(struct ath10k_htt *htt, enum ath10k_hw_txrx_mode txmode, frags_paddr = htt->frag_desc.paddr + (sizeof(struct htt_msdu_ext_desc) * msdu_id); } else { - frags = skb_cb->htt.txbuf->frags; + frags = txbuf->frags; frags[0].dword_addr.paddr = __cpu_to_le32(skb_cb->paddr); frags[0].dword_addr.len = __cpu_to_le32(msdu->len); frags[1].dword_addr.paddr = 0; frags[1].dword_addr.len = 0; - frags_paddr = skb_cb->htt.txbuf_paddr; + frags_paddr = txbuf_paddr; } flags0 |= SM(txmode, HTT_DATA_TX_DESC_FLAGS0_PKT_TYPE); break; @@ -689,12 +689,11 @@ int ath10k_htt_tx(struct ath10k_htt *htt, enum ath10k_hw_txrx_mode txmode, * avoid extra memory allocations, compress data structures and thus * improve performance. */ - skb_cb->htt.txbuf->htc_hdr.eid = htt->eid; - skb_cb->htt.txbuf->htc_hdr.len = __cpu_to_le16( - sizeof(skb_cb->htt.txbuf->cmd_hdr) + - sizeof(skb_cb->htt.txbuf->cmd_tx) + - prefetch_len); - skb_cb->htt.txbuf->htc_hdr.flags = 0; + txbuf->htc_hdr.eid = htt->eid; + txbuf->htc_hdr.len = __cpu_to_le16(sizeof(txbuf->cmd_hdr) + + sizeof(txbuf->cmd_tx) + + prefetch_len); + txbuf->htc_hdr.flags = 0; if (skb_cb->flags & ATH10K_SKB_F_NO_HWCRYPT) flags0 |= HTT_DATA_TX_DESC_FLAGS0_NO_ENCRYPT; @@ -715,14 +714,14 @@ int ath10k_htt_tx(struct ath10k_htt *htt, enum ath10k_hw_txrx_mode txmode, */ flags1 |= HTT_DATA_TX_DESC_FLAGS1_POSTPONED; - skb_cb->htt.txbuf->cmd_hdr.msg_type = HTT_H2T_MSG_TYPE_TX_FRM; - skb_cb->htt.txbuf->cmd_tx.flags0 = flags0; - skb_cb->htt.txbuf->cmd_tx.flags1 = __cpu_to_le16(flags1); - skb_cb->htt.txbuf->cmd_tx.len = __cpu_to_le16(msdu->len); - skb_cb->htt.txbuf->cmd_tx.id = __cpu_to_le16(msdu_id); - skb_cb->htt.txbuf->cmd_tx.frags_paddr = __cpu_to_le32(frags_paddr); - skb_cb->htt.txbuf->cmd_tx.peerid = __cpu_to_le16(HTT_INVALID_PEERID); - skb_cb->htt.txbuf->cmd_tx.freq = __cpu_to_le16(freq); + txbuf->cmd_hdr.msg_type = HTT_H2T_MSG_TYPE_TX_FRM; + txbuf->cmd_tx.flags0 = flags0; + txbuf->cmd_tx.flags1 = __cpu_to_le16(flags1); + txbuf->cmd_tx.len = __cpu_to_le16(msdu->len); + txbuf->cmd_tx.id = __cpu_to_le16(msdu_id); + txbuf->cmd_tx.frags_paddr = __cpu_to_le32(frags_paddr); + txbuf->cmd_tx.peerid = __cpu_to_le16(HTT_INVALID_PEERID); + txbuf->cmd_tx.freq = __cpu_to_le16(freq); trace_ath10k_htt_tx(ar, msdu_id, msdu->len, vdev_id, tid); ath10k_dbg(ar, ATH10K_DBG_HTT, @@ -736,12 +735,12 @@ int ath10k_htt_tx(struct ath10k_htt *htt, enum ath10k_hw_txrx_mode txmode, sg_items[0].transfer_id = 0; sg_items[0].transfer_context = NULL; - sg_items[0].vaddr = &skb_cb->htt.txbuf->htc_hdr; - sg_items[0].paddr = skb_cb->htt.txbuf_paddr + - sizeof(skb_cb->htt.txbuf->frags); - sg_items[0].len = sizeof(skb_cb->htt.txbuf->htc_hdr) + - sizeof(skb_cb->htt.txbuf->cmd_hdr) + - sizeof(skb_cb->htt.txbuf->cmd_tx); + sg_items[0].vaddr = &txbuf->htc_hdr; + sg_items[0].paddr = txbuf_paddr + + sizeof(txbuf->frags); + sg_items[0].len = sizeof(txbuf->htc_hdr) + + sizeof(txbuf->cmd_hdr) + + sizeof(txbuf->cmd_tx); sg_items[1].transfer_id = 0; sg_items[1].transfer_context = NULL; -- 2.1.4