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mac80211: Store sk_pacing_shift in ieee80211_hw 

Make it possibly for drivers to adjust the default skb_pacing_shift
by storing it in the hardware struct.

Signed-off-by: Wen Gong <wgong@codeaurora.org>
[adjust commit log, move & adjust comment]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Wen Gong 2018-08-08 18:40:01 +08:00 committed by Johannes Berg
parent e80d642552
commit 70e53669c4
3 changed files with 18 additions and 7 deletions
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5
include/net/mac80211.h
View File

@ -2308,6 +2308,10 @@ enum ieee80211_hw_flags {
* supported by HW.
* @max_nan_de_entries: maximum number of NAN DE functions supported by the
* device.
*
* @tx_sk_pacing_shift: Pacing shift to set on TCP sockets when frames from
* them are encountered. The default should typically not be changed,
* unless the driver has good reasons for needing more buffers.
*/
struct ieee80211_hw {
struct ieee80211_conf conf;
@ -2343,6 +2347,7 @@ struct ieee80211_hw {
u8 n_cipher_schemes;
const struct ieee80211_cipher_scheme *cipher_schemes;
u8 max_nan_de_entries;
u8 tx_sk_pacing_shift;
};
static inline bool _ieee80211_hw_check(struct ieee80211_hw *hw,

12
net/mac80211/main.c
View File

@ -611,6 +611,18 @@ struct ieee80211_hw *ieee80211_alloc_hw_nm(size_t priv_data_len,
local->ops = ops;
local->use_chanctx = use_chanctx;
/*
* We need a bit of data queued to build aggregates properly, so
* instruct the TCP stack to allow more than a single ms of data
* to be queued in the stack. The value is a bit-shift of 1
* second, so 8 is ~4ms of queued data. Only affects local TCP
* sockets.
* This is the default, anyhow - drivers may need to override it
* for local reasons (longer buffers, longer completion time, or
* similar).
*/
local->hw.tx_sk_pacing_shift = 8;
/* set up some defaults */
local->hw.queues = 1;
local->hw.max_rates = 1;

8
net/mac80211/tx.c
View File

@ -3625,13 +3625,7 @@ void __ieee80211_subif_start_xmit(struct sk_buff *skb,
if (!IS_ERR_OR_NULL(sta)) {
struct ieee80211_fast_tx *fast_tx;
/* We need a bit of data queued to build aggregates properly, so
* instruct the TCP stack to allow more than a single ms of data
* to be queued in the stack. The value is a bit-shift of 1
* second, so 8 is ~4ms of queued data. Only affects local TCP
* sockets.
*/
sk_pacing_shift_update(skb->sk, 8);
sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift);
fast_tx = rcu_dereference(sta->fast_tx);