mwifiex: Add support for auto ARP in mwifiex.

This patch adds support for auto ARP feature in mwifiex.
The device will respond to ARP requests from the network
with ARP response in suspended state without waking up the host.
This feature is enabled in the driver by default.

Signed-off-by: Maithili Hinge <maithili@marvell.com>
Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

4 files changed, 113 insertions, 31 deletions

diff --git a/drivers/net/wireless/mwifiex/cfg80211.c b/drivers/net/wireless/mwifiex/cfg80211.c
index 8e1f681f960b..b0778a699bbc 100644
--- a/drivers/net/wireless/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/mwifiex/cfg80211.c
@@ -2732,24 +2732,71 @@ mwifiex_is_pattern_supported(struct cfg80211_pkt_pattern *pat, s8 *byte_seq,
 }
 
 #ifdef CONFIG_PM
-static int mwifiex_set_mef_filter(struct mwifiex_private *priv,
-                                  struct cfg80211_wowlan *wowlan)
+static void mwifiex_set_auto_arp_mef_entry(struct mwifiex_private *priv,
+                                           struct mwifiex_mef_entry *mef_entry)
+{
+        int i, filt_num = 0, num_ipv4 = 0;
+        struct in_device *in_dev;
+        struct in_ifaddr *ifa;
+        __be32 ips[MWIFIEX_MAX_SUPPORTED_IPADDR];
+        struct mwifiex_adapter *adapter = priv->adapter;
+
+        mef_entry->mode = MEF_MODE_HOST_SLEEP;
+        mef_entry->action = MEF_ACTION_AUTO_ARP;
+
+        /* Enable ARP offload feature */
+        memset(ips, 0, sizeof(ips));
+        for (i = 0; i < MWIFIEX_MAX_BSS_NUM; i++) {
+                if (adapter->priv[i]->netdev) {
+                        in_dev = __in_dev_get_rtnl(adapter->priv[i]->netdev);
+                        if (!in_dev)
+                                continue;
+                        ifa = in_dev->ifa_list;
+                        if (!ifa || !ifa->ifa_local)
+                                continue;
+                        ips[i] = ifa->ifa_local;
+                        num_ipv4++;
+                }
+        }
+
+        for (i = 0; i < num_ipv4; i++) {
+                if (!ips[i])
+                        continue;
+                mef_entry->filter[filt_num].repeat = 1;
+                memcpy(mef_entry->filter[filt_num].byte_seq,
+                       (u8 *)&ips[i], sizeof(ips[i]));
+                mef_entry->filter[filt_num].
+                        byte_seq[MWIFIEX_MEF_MAX_BYTESEQ] =
+                        sizeof(ips[i]);
+                mef_entry->filter[filt_num].offset = 46;
+                mef_entry->filter[filt_num].filt_type = TYPE_EQ;
+                if (filt_num) {
+                        mef_entry->filter[filt_num].filt_action =
+                                TYPE_OR;
+                }
+                filt_num++;
+        }
+
+        mef_entry->filter[filt_num].repeat = 1;
+        mef_entry->filter[filt_num].byte_seq[0] = 0x08;
+        mef_entry->filter[filt_num].byte_seq[1] = 0x06;
+        mef_entry->filter[filt_num].byte_seq[MWIFIEX_MEF_MAX_BYTESEQ] = 2;
+        mef_entry->filter[filt_num].offset = 20;
+        mef_entry->filter[filt_num].filt_type = TYPE_EQ;
+        mef_entry->filter[filt_num].filt_action = TYPE_AND;
+}
+
+static int mwifiex_set_wowlan_mef_entry(struct mwifiex_private *priv,
+                                        struct mwifiex_ds_mef_cfg *mef_cfg,
+                                        struct mwifiex_mef_entry *mef_entry,
+                                        struct cfg80211_wowlan *wowlan)
 {
         int i, filt_num = 0, ret = 0;
         bool first_pat = true;
         u8 byte_seq[MWIFIEX_MEF_MAX_BYTESEQ + 1];
         const u8 ipv4_mc_mac[] = {0x33, 0x33};
         const u8 ipv6_mc_mac[] = {0x01, 0x00, 0x5e};
-        struct mwifiex_ds_mef_cfg mef_cfg;
-        struct mwifiex_mef_entry *mef_entry;
-
-        mef_entry = kzalloc(sizeof(*mef_entry), GFP_KERNEL);
-        if (!mef_entry)
-                return -ENOMEM;
 
-        memset(&mef_cfg, 0, sizeof(mef_cfg));
-        mef_cfg.num_entries = 1;
-        mef_cfg.mef_entry = mef_entry;
         mef_entry->mode = MEF_MODE_HOST_SLEEP;
         mef_entry->action = MEF_ACTION_ALLOW_AND_WAKEUP_HOST;
 
@@ -2766,20 +2813,19 @@ static int mwifiex_set_mef_filter(struct mwifiex_private *priv,
                 if (!wowlan->patterns[i].pkt_offset) {
                         if (!(byte_seq[0] & 0x01) &&
                             (byte_seq[MWIFIEX_MEF_MAX_BYTESEQ] == 1)) {
-                                mef_cfg.criteria |= MWIFIEX_CRITERIA_UNICAST;
+                                mef_cfg->criteria |= MWIFIEX_CRITERIA_UNICAST;
                                 continue;
                         } else if (is_broadcast_ether_addr(byte_seq)) {
-                                mef_cfg.criteria |= MWIFIEX_CRITERIA_BROADCAST;
+                                mef_cfg->criteria |= MWIFIEX_CRITERIA_BROADCAST;
                                 continue;
                         } else if ((!memcmp(byte_seq, ipv4_mc_mac, 2) &&
                                     (byte_seq[MWIFIEX_MEF_MAX_BYTESEQ] == 2)) ||
                                    (!memcmp(byte_seq, ipv6_mc_mac, 3) &&
                                     (byte_seq[MWIFIEX_MEF_MAX_BYTESEQ] == 3))) {
-                                mef_cfg.criteria |= MWIFIEX_CRITERIA_MULTICAST;
+                                mef_cfg->criteria |= MWIFIEX_CRITERIA_MULTICAST;
                                 continue;
                         }
                 }
-
                 mef_entry->filter[filt_num].repeat = 1;
                 mef_entry->filter[filt_num].offset =
                         wowlan->patterns[i].pkt_offset;
@@ -2796,7 +2842,7 @@ static int mwifiex_set_mef_filter(struct mwifiex_private *priv,
         }
 
         if (wowlan->magic_pkt) {
-                mef_cfg.criteria |= MWIFIEX_CRITERIA_UNICAST;
+                mef_cfg->criteria |= MWIFIEX_CRITERIA_UNICAST;
                 mef_entry->filter[filt_num].repeat = 16;
                 memcpy(mef_entry->filter[filt_num].byte_seq, priv->curr_addr,
                                 ETH_ALEN);
@@ -2817,6 +2863,34 @@ static int mwifiex_set_mef_filter(struct mwifiex_private *priv,
                 mef_entry->filter[filt_num].filt_type = TYPE_EQ;
                 mef_entry->filter[filt_num].filt_action = TYPE_OR;
         }
+        return ret;
+}
+
+static int mwifiex_set_mef_filter(struct mwifiex_private *priv,
+                                  struct cfg80211_wowlan *wowlan)
+{
+        int ret = 0, num_entries = 1;
+        struct mwifiex_ds_mef_cfg mef_cfg;
+        struct mwifiex_mef_entry *mef_entry;
+
+        if (wowlan->n_patterns || wowlan->magic_pkt)
+                num_entries++;
+
+        mef_entry = kcalloc(num_entries, sizeof(*mef_entry), GFP_KERNEL);
+        if (!mef_entry)
+                return -ENOMEM;
+
+        memset(&mef_cfg, 0, sizeof(mef_cfg));
+        mef_cfg.criteria |= MWIFIEX_CRITERIA_BROADCAST |
+                MWIFIEX_CRITERIA_UNICAST;
+        mef_cfg.num_entries = num_entries;
+        mef_cfg.mef_entry = mef_entry;
+
+        mwifiex_set_auto_arp_mef_entry(priv, &mef_entry[0]);
+
+        if (wowlan->n_patterns || wowlan->magic_pkt)
+                ret = mwifiex_set_wowlan_mef_entry(priv, &mef_cfg,
+                                                   &mef_entry[1], wowlan);
 
         if (!mef_cfg.criteria)
                 mef_cfg.criteria = MWIFIEX_CRITERIA_BROADCAST |
@@ -2824,8 +2898,8 @@ static int mwifiex_set_mef_filter(struct mwifiex_private *priv,
                         MWIFIEX_CRITERIA_MULTICAST;
 
         ret = mwifiex_send_cmd(priv, HostCmd_CMD_MEF_CFG,
-                        HostCmd_ACT_GEN_SET, 0, &mef_cfg, true);
-
+                        HostCmd_ACT_GEN_SET, 0,
+                        &mef_cfg, true);
         kfree(mef_entry);
         return ret;
 }
@@ -2850,12 +2924,10 @@ static int mwifiex_cfg80211_suspend(struct wiphy *wiphy,
                 return 0;
         }
 
-        if (wowlan->n_patterns || wowlan->magic_pkt) {
-                ret = mwifiex_set_mef_filter(priv, wowlan);
-                if (ret) {
-                        dev_err(adapter->dev, "Failed to set MEF filter\n");
-                        return ret;
-                }
+        ret = mwifiex_set_mef_filter(priv, wowlan);
+        if (ret) {
+                dev_err(adapter->dev, "Failed to set MEF filter\n");
+                return ret;
         }
 
         if (wowlan->disconnect) {
diff --git a/drivers/net/wireless/mwifiex/fw.h b/drivers/net/wireless/mwifiex/fw.h
index df553e86a0ad..21a942fd2226 100644
--- a/drivers/net/wireless/mwifiex/fw.h
+++ b/drivers/net/wireless/mwifiex/fw.h
@@ -523,9 +523,11 @@ enum P2P_MODES {
 #define TYPE_OR                         (MAX_OPERAND+5)
 #define MEF_MODE_HOST_SLEEP                     1
 #define MEF_ACTION_ALLOW_AND_WAKEUP_HOST        3
+#define MEF_ACTION_AUTO_ARP                    0x10
 #define MWIFIEX_CRITERIA_BROADCAST      BIT(0)
 #define MWIFIEX_CRITERIA_UNICAST        BIT(1)
 #define MWIFIEX_CRITERIA_MULTICAST      BIT(3)
+#define MWIFIEX_MAX_SUPPORTED_IPADDR              4
 
 #define ACT_TDLS_DELETE            0x00
 #define ACT_TDLS_CREATE            0x01
diff --git a/drivers/net/wireless/mwifiex/main.h b/drivers/net/wireless/mwifiex/main.h
index 16be45e9a66a..a0908c64103a 100644
--- a/drivers/net/wireless/mwifiex/main.h
+++ b/drivers/net/wireless/mwifiex/main.h
@@ -35,6 +35,7 @@
 #include <linux/ctype.h>
 #include <linux/of.h>
 #include <linux/idr.h>
+#include <linux/inetdevice.h>
 
 #include "decl.h"
 #include "ioctl.h"
diff --git a/drivers/net/wireless/mwifiex/sta_cmd.c b/drivers/net/wireless/mwifiex/sta_cmd.c
index f7d204ffd6e9..b23eaed84701 100644
--- a/drivers/net/wireless/mwifiex/sta_cmd.c
+++ b/drivers/net/wireless/mwifiex/sta_cmd.c
@@ -1370,22 +1370,29 @@ mwifiex_cmd_mef_cfg(struct mwifiex_private *priv,
                     struct mwifiex_ds_mef_cfg *mef)
 {
         struct host_cmd_ds_mef_cfg *mef_cfg = &cmd->params.mef_cfg;
+        struct mwifiex_fw_mef_entry *mef_entry = NULL;
         u8 *pos = (u8 *)mef_cfg;
+        u16 i;
 
         cmd->command = cpu_to_le16(HostCmd_CMD_MEF_CFG);
 
         mef_cfg->criteria = cpu_to_le32(mef->criteria);
         mef_cfg->num_entries = cpu_to_le16(mef->num_entries);
         pos += sizeof(*mef_cfg);
-        mef_cfg->mef_entry->mode = mef->mef_entry->mode;
-        mef_cfg->mef_entry->action = mef->mef_entry->action;
-        pos += sizeof(*(mef_cfg->mef_entry));
 
-        if (mwifiex_cmd_append_rpn_expression(priv, mef->mef_entry, &pos))
-                return -1;
+        for (i = 0; i < mef->num_entries; i++) {
+                mef_entry = (struct mwifiex_fw_mef_entry *)pos;
+                mef_entry->mode = mef->mef_entry[i].mode;
+                mef_entry->action = mef->mef_entry[i].action;
+                pos += sizeof(*mef_cfg->mef_entry);
+
+                if (mwifiex_cmd_append_rpn_expression(priv,
+                                                      &mef->mef_entry[i], &pos))
+                        return -1;
 
-        mef_cfg->mef_entry->exprsize =
-                        cpu_to_le16(pos - mef_cfg->mef_entry->expr);
+                mef_entry->exprsize =
+                        cpu_to_le16(pos - mef_entry->expr);
+        }
         cmd->size = cpu_to_le16((u16) (pos - (u8 *)mef_cfg) + S_DS_GEN);
 
         return 0;