iwlwifi: mvm: support rss queues configuration command

9000 series supports multi-queue rx. The hardware needs
to be configured with the hash functions to perform and
indirection table that maps hash results to the relevant
CPUs\queues.
Support this configuration.
Add debugfs hook to configure the indirection table in
order to enable performance analysis. The configuration
is stateless, receives a partial or full pattern and sends
the command to the firmware.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>

1 files changed, 44 insertions, 0 deletions

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
index 5c0f93997b7b..005cc09757d2 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs.c
@@ -7,6 +7,7 @@
  *
  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
+ * Copyright(c) 2016 Intel Deutschland GmbH
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of version 2 of the GNU General Public License as
@@ -943,6 +944,47 @@ iwl_dbgfs_scan_ant_rxchain_write(struct iwl_mvm *mvm, char *buf,
         return count;
 }
 
+static ssize_t iwl_dbgfs_indirection_tbl_write(struct iwl_mvm *mvm,
+                                               char *buf, size_t count,
+                                               loff_t *ppos)
+{
+        struct iwl_rss_config_cmd cmd = {
+                .flags = cpu_to_le32(IWL_RSS_ENABLE),
+                .hash_mask = IWL_RSS_HASH_TYPE_IPV4_TCP |
+                             IWL_RSS_HASH_TYPE_IPV4_PAYLOAD |
+                             IWL_RSS_HASH_TYPE_IPV6_TCP |
+                             IWL_RSS_HASH_TYPE_IPV6_PAYLOAD,
+        };
+        int ret, i, num_repeats, nbytes = count / 2;
+
+        ret = hex2bin(cmd.indirection_table, buf, nbytes);
+        if (ret)
+                return ret;
+
+        /*
+         * The input is the redirection table, partial or full.
+         * Repeat the pattern if needed.
+         * For example, input of 01020F will be repeated 42 times,
+         * indirecting RSS hash results to queues 1, 2, 15 (skipping
+         * queues 3 - 14).
+         */
+        num_repeats = ARRAY_SIZE(cmd.indirection_table) / nbytes;
+        for (i = 1; i < num_repeats; i++)
+                memcpy(&cmd.indirection_table[i * nbytes],
+                       cmd.indirection_table, nbytes);
+        /* handle cut in the middle pattern for the last places */
+        memcpy(&cmd.indirection_table[i * nbytes], cmd.indirection_table,
+               ARRAY_SIZE(cmd.indirection_table) % nbytes);
+
+        memcpy(cmd.secret_key, mvm->secret_key, ARRAY_SIZE(cmd.secret_key));
+
+        mutex_lock(&mvm->mutex);
+        ret = iwl_mvm_send_cmd_pdu(mvm, RSS_CONFIG_CMD, 0, sizeof(cmd), &cmd);
+        mutex_unlock(&mvm->mutex);
+
+        return ret ?: count;
+}
+
 static ssize_t iwl_dbgfs_fw_dbg_conf_read(struct file *file,
                                           char __user *user_buf,
                                           size_t count, loff_t *ppos)
@@ -1455,6 +1497,7 @@ 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(indirection_tbl, 16);
 
 #ifdef CONFIG_IWLWIFI_BCAST_FILTERING
 MVM_DEBUGFS_READ_WRITE_FILE_OPS(bcast_filters, 256);
@@ -1499,6 +1542,7 @@ int iwl_mvm_dbgfs_register(struct iwl_mvm *mvm, struct dentry *dbgfs_dir)
         MVM_DEBUGFS_ADD_FILE(fw_dbg_collect, 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);
         if (!debugfs_create_bool("enable_scan_iteration_notif",
                                  S_IRUSR | S_IWUSR,
                                  mvm->debugfs_dir,