Since an A-MSDU has one single CRC for the whole
aggregation, it is tricky to know what size to allow.
For now, add a debugfs hook to be able to tune the
algorightm.
Signed-off-by: Emmanuel Grumbach <emmanuel.grumb...@intel.com>
---
drivers/net/wireless/iwlwifi/mvm/debugfs.c | 19 +++++++++++++++++++
drivers/net/wireless/iwlwifi/mvm/mvm.h | 1 +
drivers/net/wireless/iwlwifi/mvm/tx.c | 7 ++++++-
3 files changed, 26 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/iwlwifi/mvm/debugfs.c
b/drivers/net/wireless/iwlwifi/mvm/debugfs.c
index ffb4b5c..621792c 100644
--- a/drivers/net/wireless/iwlwifi/mvm/debugfs.c
+++ b/drivers/net/wireless/iwlwifi/mvm/debugfs.c
@@ -981,6 +981,23 @@ static ssize_t iwl_dbgfs_fw_dbg_collect_write(struct
iwl_mvm *mvm,
return count;
}
+static ssize_t iwl_dbgfs_max_amsdu_sz_write(struct iwl_mvm *mvm,
+ char *buf, size_t count,
+ loff_t *ppos)
+{
+ unsigned int max_amsdu_sz;
+ int ret;
+
+ ret = kstrtoint(buf, 0, &max_amsdu_sz);
+
+ if (max_amsdu_sz > 11454 || max_amsdu_sz < IEEE80211_MAX_DATA_LEN)
+ return -EINVAL;
+
+ mvm->max_amsdu_sz = max_amsdu_sz;
+
+ 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,
@@ -1499,6 +1516,7 @@ MVM_DEBUGFS_READ_WRITE_FILE_OPS(scan_ant_rxchain, 8);
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, 8);
+MVM_DEBUGFS_WRITE_FILE_OPS(max_amsdu_sz, 10);
#ifdef CONFIG_IWLWIFI_BCAST_FILTERING
MVM_DEBUGFS_READ_WRITE_FILE_OPS(bcast_filters, 256);
@@ -1542,6 +1560,7 @@ 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_sz, mvm->debugfs_dir, S_IWUSR);
if (!debugfs_create_bool("enable_scan_iteration_notif",
S_IRUSR | S_IWUSR,
mvm->debugfs_dir,
diff --git a/drivers/net/wireless/iwlwifi/mvm/mvm.h
b/drivers/net/wireless/iwlwifi/mvm/mvm.h
index c8b9d88..82a0c50 100644
--- a/drivers/net/wireless/iwlwifi/mvm/mvm.h
+++ b/drivers/net/wireless/iwlwifi/mvm/mvm.h
@@ -663,6 +663,7 @@ struct iwl_mvm {
u32 dbgfs_prph_reg_addr;
bool disable_power_off;
bool disable_power_off_d3;
+ unsigned int max_amsdu_sz;
u32 scan_iter_notif_enabled; /* must be u32 for debugfs_create_bool */
diff --git a/drivers/net/wireless/iwlwifi/mvm/tx.c
b/drivers/net/wireless/iwlwifi/mvm/tx.c
index 3f89d71..cddc296 100644
--- a/drivers/net/wireless/iwlwifi/mvm/tx.c
+++ b/drivers/net/wireless/iwlwifi/mvm/tx.c
@@ -903,7 +903,12 @@ static int iwl_mvm_tx_tso(struct iwl_mvm *mvm, struct
sk_buff* skb_gso,
if (s.gso_payload_len - s.gso_payload_pos <= s.mss)
s.amsdu = false;
- max_amsdu_sz = sta->max_amsdu_sz;
+ max_amsdu_sz = ACCESS_ONCE(mvm->max_amsdu_sz);
+ if (max_amsdu_sz)
+ max_amsdu_sz = min_t(unsigned int, sta->max_amsdu_sz,
+ max_amsdu_sz);
+ else
+ max_amsdu_sz = sta->max_amsdu_sz;
if (!max_amsdu_sz || !s.amsdu) {
int l;
--
2.1.4
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