[PATCH net-next 2/2] macsec: enable GRO and RPS on macsec devices

[Paolo Abeni]

Use gro_gells to trigger GRO and allow RPS on macsec traffic
after decryption.
Also, be sure to avoid clearing software offload features in
macsec_fix_features().
Overall this increase TCP tput by 30% on recent h/w.

Signed-off-by: Paolo Abeni <pab...@redhat.com>
Acked-by: Hannes Frederic Sowa <han...@stressinduktion.org>
---
 drivers/net/macsec.c | 32 +++++++++++++++++++++++++-------
 1 file changed, 25 insertions(+), 7 deletions(-)

diff --git a/drivers/net/macsec.c b/drivers/net/macsec.c
index 8bcd78f..0cbb935 100644
--- a/drivers/net/macsec.c
+++ b/drivers/net/macsec.c
@@ -18,6 +18,7 @@
 #include <linux/rtnetlink.h>
 #include <net/genetlink.h>
 #include <net/sock.h>
+#include <net/gro_cells.h>
 
 #include <uapi/linux/if_macsec.h>
 
@@ -268,6 +269,7 @@ struct macsec_dev {
        struct net_device *real_dev;
        struct pcpu_secy_stats __percpu *stats;
        struct list_head secys;
+       struct gro_cells gro_cells;
 };
 
 /**
@@ -879,7 +881,7 @@ static void macsec_decrypt_done(struct crypto_async_request 
*base, int err)
        macsec_reset_skb(skb, macsec->secy.netdev);
 
        len = skb->len;
-       ret = netif_rx(skb);
+       ret = gro_cells_receive(&macsec->gro_cells, skb);
        if (ret == NET_RX_SUCCESS)
                count_rx(dev, len);
        else
@@ -1052,6 +1054,7 @@ static rx_handler_result_t macsec_handle_frame(struct 
sk_buff **pskb)
        struct pcpu_rx_sc_stats *rxsc_stats;
        struct pcpu_secy_stats *secy_stats;
        bool pulled_sci;
+       int ret;
 
        if (skb_headroom(skb) < ETH_HLEN)
                goto drop_direct;
@@ -1193,12 +1196,17 @@ deliver:
 
        if (rx_sa)
                macsec_rxsa_put(rx_sa);
-       count_rx(dev, skb->len);
+
+       ret = gro_cells_receive(&macsec->gro_cells, skb);
+       if (ret == NET_RX_SUCCESS)
+               count_rx(dev, skb->len);
+       else
+               macsec->secy.netdev->stats.rx_dropped++;
 
        rcu_read_unlock();
 
-       *pskb = skb;
-       return RX_HANDLER_ANOTHER;
+       *pskb = NULL;
+       return RX_HANDLER_CONSUMED;
 
 drop:
        macsec_rxsa_put(rx_sa);
@@ -1218,7 +1226,6 @@ nosci:
 
        list_for_each_entry_rcu(macsec, &rxd->secys, secys) {
                struct sk_buff *nskb;
-               int ret;
 
                secy_stats = this_cpu_ptr(macsec->stats);
 
@@ -2675,11 +2682,18 @@ static int macsec_dev_init(struct net_device *dev)
 {
        struct macsec_dev *macsec = macsec_priv(dev);
        struct net_device *real_dev = macsec->real_dev;
+       int err;
 
        dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
        if (!dev->tstats)
                return -ENOMEM;
 
+       err = gro_cells_init(&macsec->gro_cells, dev);
+       if (err) {
+               free_percpu(dev->tstats);
+               return err;
+       }
+
        dev->features = real_dev->features & MACSEC_FEATURES;
        dev->features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
 
@@ -2698,6 +2712,9 @@ static int macsec_dev_init(struct net_device *dev)
 
 static void macsec_dev_uninit(struct net_device *dev)
 {
+       struct macsec_dev *macsec = macsec_priv(dev);
+
+       gro_cells_destroy(&macsec->gro_cells);
        free_percpu(dev->tstats);
 }
 
@@ -2707,8 +2724,9 @@ static netdev_features_t macsec_fix_features(struct 
net_device *dev,
        struct macsec_dev *macsec = macsec_priv(dev);
        struct net_device *real_dev = macsec->real_dev;
 
-       features &= real_dev->features & MACSEC_FEATURES;
-       features |= NETIF_F_LLTX | NETIF_F_GSO_SOFTWARE;
+       features &= (real_dev->features & MACSEC_FEATURES) |
+                   NETIF_F_GSO_SOFTWARE | NETIF_F_SOFT_FEATURES;
+       features |= NETIF_F_LLTX;
 
        return features;
 }
-- 
1.8.3.1