1 // SPDX-License-Identifier: BSD-3-Clause-Clear
2 /*
3 * Copyright (c) 2018-2021 The Linux Foundation. All rights reserved.
4 * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
5 */
6
7 #include "core.h"
8 #include "dp_tx.h"
9 #include "debug.h"
10 #include "debugfs.h"
11 #include "hw.h"
12 #include "peer.h"
13 #include "mac.h"
14
15 enum hal_tcl_encap_type
ath12k_dp_tx_get_encap_type(struct ath12k_base * ab,struct sk_buff * skb)16 ath12k_dp_tx_get_encap_type(struct ath12k_base *ab, struct sk_buff *skb)
17 {
18 struct ieee80211_tx_info *tx_info = IEEE80211_SKB_CB(skb);
19
20 if (test_bit(ATH12K_FLAG_RAW_MODE, &ab->dev_flags))
21 return HAL_TCL_ENCAP_TYPE_RAW;
22
23 if (tx_info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP)
24 return HAL_TCL_ENCAP_TYPE_ETHERNET;
25
26 return HAL_TCL_ENCAP_TYPE_NATIVE_WIFI;
27 }
28 EXPORT_SYMBOL(ath12k_dp_tx_get_encap_type);
29
ath12k_dp_tx_encap_nwifi(struct sk_buff * skb)30 void ath12k_dp_tx_encap_nwifi(struct sk_buff *skb)
31 {
32 struct ieee80211_hdr *hdr = (void *)skb->data;
33 u8 *qos_ctl;
34
35 if (!ieee80211_is_data_qos(hdr->frame_control))
36 return;
37
38 qos_ctl = ieee80211_get_qos_ctl(hdr);
39 memmove(skb->data + IEEE80211_QOS_CTL_LEN,
40 #if defined(__linux__)
41 skb->data, (void *)qos_ctl - (void *)skb->data);
42 #elif defined(__FreeBSD__)
43 skb->data, qos_ctl - skb->data);
44 #endif
45 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
46
47 hdr = (void *)skb->data;
48 hdr->frame_control &= ~__cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
49 }
50 EXPORT_SYMBOL(ath12k_dp_tx_encap_nwifi);
51
ath12k_dp_tx_get_tid(struct sk_buff * skb)52 u8 ath12k_dp_tx_get_tid(struct sk_buff *skb)
53 {
54 struct ieee80211_hdr *hdr = (void *)skb->data;
55 struct ath12k_skb_cb *cb = ATH12K_SKB_CB(skb);
56
57 if (cb->flags & ATH12K_SKB_HW_80211_ENCAP)
58 return skb->priority & IEEE80211_QOS_CTL_TID_MASK;
59 else if (!ieee80211_is_data_qos(hdr->frame_control))
60 return HAL_DESC_REO_NON_QOS_TID;
61 else
62 return skb->priority & IEEE80211_QOS_CTL_TID_MASK;
63 }
64 EXPORT_SYMBOL(ath12k_dp_tx_get_tid);
65
ath12k_dp_tx_get_encrypt_type(u32 cipher)66 enum hal_encrypt_type ath12k_dp_tx_get_encrypt_type(u32 cipher)
67 {
68 switch (cipher) {
69 case WLAN_CIPHER_SUITE_WEP40:
70 return HAL_ENCRYPT_TYPE_WEP_40;
71 case WLAN_CIPHER_SUITE_WEP104:
72 return HAL_ENCRYPT_TYPE_WEP_104;
73 case WLAN_CIPHER_SUITE_TKIP:
74 return HAL_ENCRYPT_TYPE_TKIP_MIC;
75 case WLAN_CIPHER_SUITE_CCMP:
76 return HAL_ENCRYPT_TYPE_CCMP_128;
77 case WLAN_CIPHER_SUITE_CCMP_256:
78 return HAL_ENCRYPT_TYPE_CCMP_256;
79 case WLAN_CIPHER_SUITE_GCMP:
80 return HAL_ENCRYPT_TYPE_GCMP_128;
81 case WLAN_CIPHER_SUITE_GCMP_256:
82 return HAL_ENCRYPT_TYPE_AES_GCMP_256;
83 default:
84 return HAL_ENCRYPT_TYPE_OPEN;
85 }
86 }
87 EXPORT_SYMBOL(ath12k_dp_tx_get_encrypt_type);
88
ath12k_dp_tx_release_txbuf(struct ath12k_dp * dp,struct ath12k_tx_desc_info * tx_desc,u8 pool_id)89 void ath12k_dp_tx_release_txbuf(struct ath12k_dp *dp,
90 struct ath12k_tx_desc_info *tx_desc,
91 u8 pool_id)
92 {
93 spin_lock_bh(&dp->tx_desc_lock[pool_id]);
94 tx_desc->skb_ext_desc = NULL;
95 list_move_tail(&tx_desc->list, &dp->tx_desc_free_list[pool_id]);
96 spin_unlock_bh(&dp->tx_desc_lock[pool_id]);
97 }
98 EXPORT_SYMBOL(ath12k_dp_tx_release_txbuf);
99
ath12k_dp_tx_assign_buffer(struct ath12k_dp * dp,u8 pool_id)100 struct ath12k_tx_desc_info *ath12k_dp_tx_assign_buffer(struct ath12k_dp *dp,
101 u8 pool_id)
102 {
103 struct ath12k_tx_desc_info *desc;
104
105 spin_lock_bh(&dp->tx_desc_lock[pool_id]);
106 desc = list_first_entry_or_null(&dp->tx_desc_free_list[pool_id],
107 struct ath12k_tx_desc_info,
108 list);
109 if (!desc) {
110 spin_unlock_bh(&dp->tx_desc_lock[pool_id]);
111 ath12k_warn(dp->ab, "failed to allocate data Tx buffer\n");
112 return NULL;
113 }
114
115 list_move_tail(&desc->list, &dp->tx_desc_used_list[pool_id]);
116 spin_unlock_bh(&dp->tx_desc_lock[pool_id]);
117
118 return desc;
119 }
120 EXPORT_SYMBOL(ath12k_dp_tx_assign_buffer);
121
ath12k_dp_metadata_align_skb(struct sk_buff * skb,u8 tail_len)122 void *ath12k_dp_metadata_align_skb(struct sk_buff *skb, u8 tail_len)
123 {
124 struct sk_buff *tail;
125 void *metadata;
126
127 if (unlikely(skb_cow_data(skb, tail_len, &tail) < 0))
128 return NULL;
129
130 metadata = pskb_put(skb, tail, tail_len);
131 memset(metadata, 0, tail_len);
132 return metadata;
133 }
134 EXPORT_SYMBOL(ath12k_dp_metadata_align_skb);
135
ath12k_dp_tx_move_payload(struct sk_buff * skb,unsigned long delta,bool head)136 static void ath12k_dp_tx_move_payload(struct sk_buff *skb,
137 unsigned long delta,
138 bool head)
139 {
140 unsigned long len = skb->len;
141
142 if (head) {
143 skb_push(skb, delta);
144 memmove(skb->data, skb->data + delta, len);
145 skb_trim(skb, len);
146 } else {
147 skb_put(skb, delta);
148 memmove(skb->data + delta, skb->data, len);
149 skb_pull(skb, delta);
150 }
151 }
152
ath12k_dp_tx_align_payload(struct ath12k_dp * dp,struct sk_buff ** pskb)153 int ath12k_dp_tx_align_payload(struct ath12k_dp *dp, struct sk_buff **pskb)
154 {
155 u32 iova_mask = dp->hw_params->iova_mask;
156 unsigned long offset, delta1, delta2;
157 struct sk_buff *skb2, *skb = *pskb;
158 unsigned int headroom = skb_headroom(skb);
159 int tailroom = skb_tailroom(skb);
160 int ret = 0;
161
162 offset = (unsigned long)skb->data & iova_mask;
163 delta1 = offset;
164 delta2 = iova_mask - offset + 1;
165
166 if (headroom >= delta1) {
167 ath12k_dp_tx_move_payload(skb, delta1, true);
168 } else if (tailroom >= delta2) {
169 ath12k_dp_tx_move_payload(skb, delta2, false);
170 } else {
171 skb2 = skb_realloc_headroom(skb, iova_mask);
172 if (!skb2) {
173 ret = -ENOMEM;
174 goto out;
175 }
176
177 dev_kfree_skb_any(skb);
178
179 offset = (unsigned long)skb2->data & iova_mask;
180 if (offset)
181 ath12k_dp_tx_move_payload(skb2, offset, true);
182 *pskb = skb2;
183 }
184
185 out:
186 return ret;
187 }
188 EXPORT_SYMBOL(ath12k_dp_tx_align_payload);
189
ath12k_dp_tx_free_txbuf(struct ath12k_dp * dp,struct dp_tx_ring * tx_ring,struct ath12k_tx_desc_params * desc_params)190 void ath12k_dp_tx_free_txbuf(struct ath12k_dp *dp,
191 struct dp_tx_ring *tx_ring,
192 struct ath12k_tx_desc_params *desc_params)
193 {
194 struct ath12k_pdev_dp *dp_pdev;
195 struct sk_buff *msdu = desc_params->skb;
196 struct ath12k_skb_cb *skb_cb;
197 u8 pdev_idx = ath12k_hw_mac_id_to_pdev_id(dp->hw_params, desc_params->mac_id);
198
199 skb_cb = ATH12K_SKB_CB(msdu);
200
201 dma_unmap_single(dp->dev, skb_cb->paddr, msdu->len, DMA_TO_DEVICE);
202 if (skb_cb->paddr_ext_desc) {
203 dma_unmap_single(dp->dev, skb_cb->paddr_ext_desc,
204 desc_params->skb_ext_desc->len, DMA_TO_DEVICE);
205 dev_kfree_skb_any(desc_params->skb_ext_desc);
206 }
207
208 guard(rcu)();
209
210 dp_pdev = ath12k_dp_to_pdev_dp(dp, pdev_idx);
211
212 ieee80211_free_txskb(ath12k_pdev_dp_to_hw(dp_pdev), msdu);
213
214 if (atomic_dec_and_test(&dp_pdev->num_tx_pending))
215 wake_up(&dp_pdev->tx_empty_waitq);
216 }
217 EXPORT_SYMBOL(ath12k_dp_tx_free_txbuf);
218