[PATCH v2 9/9] ath10k: store msdu_id instead of txbuf pointers
Michal Kazior
michal.kazior at tieto.com
Tue Nov 10 05:10:55 PST 2015
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 <michal.kazior at tieto.com>
---
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
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