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wil6210: consider SNAP header in MTU calculations 

When encapsulating 802.3 frames into the 802.11 ones,
8-byte SNAP header added to save ethtype. SNAP is part of
the frame body, thus should be counted in MSDU. So,
MTU = MSDU - SNAP

Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Vladimir Kondratiev 2014-12-23 09:47:12 +02:00 committed by Kalle Valo
parent c44690a157
commit 4590d8125e
2 changed files with 5 additions and 1 deletions
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2
drivers/net/wireless/ath/wil6210/main.c
View File

@ -53,7 +53,7 @@ static int mtu_max_set(const char *val, const struct kernel_param *kp)
if (ret)
return ret;
if (mtu_max < 68 || mtu_max > IEEE80211_MAX_DATA_LEN_DMG)
if (mtu_max < 68 || mtu_max > WIL_MAX_ETH_MTU)
ret = -EINVAL;
return ret;

4
drivers/net/wireless/ath/wil6210/wil6210.h
View File

@ -77,6 +77,10 @@ static inline u32 wil_mtu2macbuf(u32 mtu)
return ALIGN(mtu + WIL_MAX_MPDU_OVERHEAD, 8);
}
/* MTU for Ethernet need to take into account 8-byte SNAP header
* to be added when encapsulating Ethernet frame into 802.11
*/
#define WIL_MAX_ETH_MTU (IEEE80211_MAX_DATA_LEN_DMG - 8)
/* Max supported by wil6210 value for interrupt threshold is 5sec. */
#define WIL6210_ITR_TRSH_MAX (5000000)
#define WIL6210_ITR_TRSH_DEFAULT (300) /* usec */