1 /* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
3  * Copyright (C) 2024-2025 Intel Corporation
9 #include "iwl-drv.h"
10 #include "iwl-utils.h"
18 	struct ieee80211_hdr *hdr = (void *)skb->data;  in iwl_tx_tso_segment()
19 	char cb[sizeof(skb->cb)];  in iwl_tx_tso_segment()  local
22 	unsigned int mss = skb_shinfo(skb)->gso_size;  in iwl_tx_tso_segment()
23 	bool ipv4 = (skb->protocol == htons(ETH_P_IP));  in iwl_tx_tso_segment()
24 	bool qos = ieee80211_is_data_qos(hdr->frame_control);  in iwl_tx_tso_segment()
25 	u16 ip_base_id = ipv4 ? ntohs(ip_hdr(skb)->id) : 0;  in iwl_tx_tso_segment()
27 	skb_shinfo(skb)->gso_size = num_subframes * mss;  in iwl_tx_tso_segment()
28 	memcpy(cb, skb->cb, sizeof(cb));  in iwl_tx_tso_segment()
31 	skb_shinfo(skb)->gso_size = mss;  in iwl_tx_tso_segment()
32 	skb_shinfo(skb)->gso_type = ipv4 ? SKB_GSO_TCPV4 : SKB_GSO_TCPV6;  in iwl_tx_tso_segment()
34 	if (IS_ERR(next) && PTR_ERR(next) == -ENOMEM)  in iwl_tx_tso_segment()
35 		return -ENOMEM;  in iwl_tx_tso_segment()
45 		memcpy(tmp->cb, cb, sizeof(tmp->cb));  in iwl_tx_tso_segment()
47 		 * Compute the length of all the data added for the A-MSDU.  in iwl_tx_tso_segment()
48 		 * This will be used to compute the length to write in the TX  in iwl_tx_tso_segment()
49 		 * command. We have: SNAP + IP + TCP for n -1 subframes and  in iwl_tx_tso_segment()
52 		tcp_payload_len = skb_tail_pointer(tmp) -  in iwl_tx_tso_segment()
53 			skb_transport_header(tmp) -  in iwl_tx_tso_segment()
54 			tcp_hdrlen(tmp) + tmp->data_len;  in iwl_tx_tso_segment()
57 			ip_hdr(tmp)->id = htons(ip_base_id + i * num_subframes);  in iwl_tx_tso_segment()
60 			skb_shinfo(tmp)->gso_size = mss;  in iwl_tx_tso_segment()
61 			skb_shinfo(tmp)->gso_type = ipv4 ? SKB_GSO_TCPV4 :  in iwl_tx_tso_segment()
70 				qc = ieee80211_get_qos_ctl((void *)tmp->data);  in iwl_tx_tso_segment()
73 			skb_shinfo(tmp)->gso_size = 0;  in iwl_tx_tso_segment()
103 		value = (((u64)value) * db_to_val[change - 1]) >> 32;  in iwl_div_by_db()
105 		db -= change;  in iwl_div_by_db()
115 	int sum_magnitude = -128;  in iwl_average_neg_dbm()
123 	 * at least -10 to -110 dBm that will not fit into a 32 bit integer.  in iwl_average_neg_dbm()
131 	 * gives us plenty of head-room for adding up a few values and even  in iwl_average_neg_dbm()
133 	 * (1/2^16 is somewhere around -48 dB, so effectively zero).  in iwl_average_neg_dbm()
154 		val_magnitude = -neg_dbm_values[i];  in iwl_average_neg_dbm()
157 			u8 div_db = sum_magnitude - val_magnitude;  in iwl_average_neg_dbm()
162 			u8 div_db = val_magnitude - sum_magnitude;  in iwl_average_neg_dbm()
182 	 * average_factor is between -0.5 dB and 0.5 dB.  in iwl_average_neg_dbm()
184 	 * Just do -1 dB steps and find the point where  in iwl_average_neg_dbm()
185 	 *   -0.5 dB * -i dB = 0x10000 * 10^(-0.5/10) / i dB  in iwl_average_neg_dbm()
193 	return clamp(average_magnitude - i, -128, 0);  in iwl_average_neg_dbm()