From 9e7dce28659531b2741939e5b6f438bca1422720 Mon Sep 17 00:00:00 2001 From: Emmanuel Grumbach Date: Mon, 26 Oct 2015 16:14:06 +0200 Subject: [PATCH] iwlwifi: mvm: allow to limit the A-MSDU from debugfs in order to be able to tune the size of the desired A-MSDU based on link condition, add a knob to modify the length of the A-MSDU. Signed-off-by: Emmanuel Grumbach --- .../net/wireless/intel/iwlwifi/mvm/debugfs.c | 19 +++++++++++++++++++ drivers/net/wireless/intel/iwlwifi/mvm/mvm.h | 1 + drivers/net/wireless/intel/iwlwifi/mvm/tx.c | 5 +++++ 3 files changed, 25 insertions(+) diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c index 54d0d7d2d0b1..56e6b0b8b9cc 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c @@ -64,6 +64,7 @@ * *****************************************************************************/ #include +#include #include "mvm.h" #include "fw-dbg.h" @@ -1080,6 +1081,22 @@ static ssize_t iwl_dbgfs_fw_dbg_collect_write(struct iwl_mvm *mvm, return count; } +static ssize_t iwl_dbgfs_max_amsdu_len_write(struct iwl_mvm *mvm, + char *buf, size_t count, + loff_t *ppos) +{ + unsigned int max_amsdu_len; + int ret; + + ret = kstrtouint(buf, 0, &max_amsdu_len); + + if (max_amsdu_len > IEEE80211_MAX_MPDU_LEN_VHT_11454) + return -EINVAL; + mvm->max_amsdu_len = max_amsdu_len; + + return count; +} + #define ADD_TEXT(...) pos += scnprintf(buf + pos, bufsz - pos, __VA_ARGS__) #ifdef CONFIG_IWLWIFI_BCAST_FILTERING static ssize_t iwl_dbgfs_bcast_filters_read(struct file *file, @@ -1497,6 +1514,7 @@ MVM_DEBUGFS_READ_WRITE_FILE_OPS(d0i3_refs, 8); MVM_DEBUGFS_READ_WRITE_FILE_OPS(fw_dbg_conf, 8); MVM_DEBUGFS_WRITE_FILE_OPS(fw_dbg_collect, 64); MVM_DEBUGFS_WRITE_FILE_OPS(cont_recording, 8); +MVM_DEBUGFS_WRITE_FILE_OPS(max_amsdu_len, 8); MVM_DEBUGFS_WRITE_FILE_OPS(indirection_tbl, (IWL_RSS_INDIRECTION_TABLE_SIZE * 2)); @@ -1541,6 +1559,7 @@ int iwl_mvm_dbgfs_register(struct iwl_mvm *mvm, struct dentry *dbgfs_dir) MVM_DEBUGFS_ADD_FILE(d0i3_refs, mvm->debugfs_dir, S_IRUSR | S_IWUSR); MVM_DEBUGFS_ADD_FILE(fw_dbg_conf, mvm->debugfs_dir, S_IRUSR | S_IWUSR); MVM_DEBUGFS_ADD_FILE(fw_dbg_collect, mvm->debugfs_dir, S_IWUSR); + MVM_DEBUGFS_ADD_FILE(max_amsdu_len, mvm->debugfs_dir, S_IWUSR); MVM_DEBUGFS_ADD_FILE(send_echo_cmd, mvm->debugfs_dir, S_IWUSR); MVM_DEBUGFS_ADD_FILE(cont_recording, mvm->debugfs_dir, S_IWUSR); MVM_DEBUGFS_ADD_FILE(indirection_tbl, mvm->debugfs_dir, S_IWUSR); diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h index bb811a29490d..416aedb7c19e 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h +++ b/drivers/net/wireless/intel/iwlwifi/mvm/mvm.h @@ -861,6 +861,7 @@ struct iwl_mvm { /* Indicate if device power save is allowed */ u8 ps_disabled; /* u8 instead of bool to ease debugfs_create_* usage */ + unsigned int max_amsdu_len; /* used for debugfs only */ struct ieee80211_vif __rcu *csa_vif; struct ieee80211_vif __rcu *csa_tx_blocked_vif; diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c index ff08b17b76dd..a5a55da142eb 100644 --- a/drivers/net/wireless/intel/iwlwifi/mvm/tx.c +++ b/drivers/net/wireless/intel/iwlwifi/mvm/tx.c @@ -448,6 +448,7 @@ static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb, bool ipv4 = (skb->protocol == htons(ETH_P_IP)); u16 ip_base_id = ipv4 ? ntohs(ip_hdr(skb)->id) : 0; u16 amsdu_add, snap_ip_tcp, pad, i = 0; + unsigned int dbg_max_amsdu_len; u8 *qc, tid; snap_ip_tcp = 8 + skb_transport_header(skb) - skb_network_header(skb) + @@ -477,6 +478,10 @@ static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct sk_buff *skb, } max_amsdu_len = sta->max_amsdu_len; + dbg_max_amsdu_len = ACCESS_ONCE(mvm->max_amsdu_len); + if (dbg_max_amsdu_len) + max_amsdu_len = min_t(unsigned int, max_amsdu_len, + dbg_max_amsdu_len); /* * Limit A-MSDU in A-MPDU to 4095 bytes when VHT is not -- 2.45.2