Add helpers to get EMLSR transition delay, padding delay and transition
timeout values from EML capabilities field of Multi-link Element.
Signed-off-by: Rameshkumar Sundaram <quic_ramess@xxxxxxxxxxx>
---
include/linux/ieee80211.h | 71 +++++++++++++++++++++++++++++++++++++++
1 file changed, 71 insertions(+)
diff --git a/include/linux/ieee80211.h b/include/linux/ieee80211.h
index 508d466de1cc..baebc2c483f1 100644
--- a/include/linux/ieee80211.h
+++ b/include/linux/ieee80211.h
@@ -5615,6 +5615,77 @@ static inline bool ieee80211_tid_to_link_map_size_ok(const u8 *data, size_t len)
return len >= fixed + elem_len;
}
+/**
+ * ieee80211_emlsr_pad_delay_in_us - Fetch the EMLSR Padding delay
+ * in microseconds
+ * @eml_cap: EML capabilities field value from common info field of
+ * the Multi-link element
+ * Return: the EMLSR Padding delay (in microseconds) encoded in the
+ * EML Capabilities field
+ */
+
+static inline u32 ieee80211_emlsr_pad_delay_in_us(u16 eml_cap)
+{
+ /* IEEE Std 802.11be-2024 Table 9-417i—Encoding of the EMLSR
+ * Padding Delay subfield.
+ */
+ u32 pad_delay = u16_get_bits(eml_cap, IEEE80211_EML_CAP_EMLSR_PADDING_DELAY);
+
+ if (!pad_delay || pad_delay > IEEE80211_EML_CAP_EMLSR_PADDING_DELAY_256US)
+ return 0;
+
+ return 32 * (1 << (pad_delay - 1));
+}
+
+/**
+ * ieee80211_emlsr_trans_delay_in_us - Fetch the EMLSR Transition
+ * delay in microseconds
+ * @eml_cap: EML capabilities field value from common info field of
+ * the Multi-link element
+ * Return: the EMLSR Transition delay (in microseconds) encoded in the
+ * EML Capabilities field
+ */
+
+static inline u32 ieee80211_emlsr_trans_delay_in_us(u16 eml_cap)
+{
+ /* IEEE Std 802.11be-2024 Table 9-417j—Encoding of the EMLSR
+ * Transition Delay subfield.
+ */
+ u32 trans_delay = u16_get_bits(eml_cap,
+ IEEE80211_EML_CAP_EMLSR_TRANSITION_DELAY);
+
+ /* invalid values also just use 0 */
+ if (!trans_delay ||
+ trans_delay > IEEE80211_EML_CAP_EMLSR_TRANSITION_DELAY_256US)
+ return 0;
+
+ return 16 * (1 << (trans_delay - 1));
+}
+
+/**
+ * ieee80211_eml_trans_timeout_in_us - Fetch the EMLSR Transition
+ * timeout value in microseconds
+ * @eml_cap: EML capabilities field value from common info field of
+ * the Multi-link element
+ * Return: the EMLSR Transition timeout (in microseconds) encoded in
+ * the EML Capabilities field
+ */
+
+static inline u32 ieee80211_eml_trans_timeout_in_us(u16 eml_cap)
+{
+ /* IEEE Std 802.11be-2024 Table 9-417m—Encoding of the
+ * Transition Timeout subfield.
+ */
+ u8 timeout = u16_get_bits(eml_cap, IEEE80211_EML_CAP_TRANSITION_TIMEOUT);
+
+ /* invalid values also just use 0 */
+ if (!timeout || timeout > IEEE80211_EML_CAP_TRANSITION_TIMEOUT_128TU)
+ return 0;
+
+ return 128 * (1 << (timeout - 1));
+
+}
+
#define for_each_mle_subelement(_elem, _data, _len) \
if (ieee80211_mle_size_ok(_data, _len)) \
for_each_element(_elem, \
--
2.34.1
