layerscape: add patches-5.4

[openwrt/staging/wigyori.git] / target / linux / layerscape / patches-5.4 / 701-net-0035-sdk_dpaa-accept-frames-on-RX-even-if-larger-than-MTU.patch

diff --git a/target/linux/layerscape/patches-5.4/701-net-0035-sdk_dpaa-accept-frames-on-RX-even-if-larger-than-MTU.patch b/target/linux/layerscape/patches-5.4/701-net-0035-sdk_dpaa-accept-frames-on-RX-even-if-larger-than-MTU.patch
new file mode 100644 (file)
index 0000000..d868498
--- /dev/null
+++ b/target/linux/layerscape/patches-5.4/701-net-0035-sdk_dpaa-accept-frames-on-RX-even-if-larger-than-MTU.patch
@@ -0,0 +1,64 @@
+From ab1371fec54bdd16b5f6c56c76d817404c696d4b Mon Sep 17 00:00:00 2001
+From: Camelia Groza <camelia.groza@nxp.com>
+Date: Wed, 18 Oct 2017 16:38:30 +0300
+Subject: [PATCH] sdk_dpaa: accept frames on RX even if larger than MTU
+
+Documentation/networking/netdevices.txt mentions that interfaces must
+be able to receive frames at least the size of the configured MTU. The
+behavior for received frames larger than the MTU is unspecified. We have
+been dropping these frames in software. Remove this behavior and accept
+them.
+
+Signed-off-by: Camelia Groza <camelia.groza@nxp.com>
+---
+ drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth.h    | 11 -----------
+ drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_sg.c | 11 -----------
+ 2 files changed, 22 deletions(-)
+
+--- a/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth.h
++++ b/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth.h
+@@ -514,17 +514,6 @@ dpa_fd_offset(const struct qm_fd *fd)
+       return fd->offset;
+ }
+ 
+-/* Verifies if the skb length is below the interface MTU */
+-static inline int dpa_check_rx_mtu(struct sk_buff *skb, int mtu)
+-{
+-      if (unlikely(skb->len > mtu))
+-              if ((skb->protocol != htons(ETH_P_8021Q))
+-                              || (skb->len > mtu + 4))
+-                      return -1;
+-
+-      return 0;
+-}
+-
+ static inline uint16_t dpa_get_headroom(struct dpa_buffer_layout_s *bl)
+ {
+       uint16_t headroom;
+--- a/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_sg.c
++++ b/drivers/net/ethernet/freescale/sdk_dpaa/dpaa_eth_sg.c
+@@ -616,13 +616,6 @@ void __hot _dpa_rx(struct net_device *ne
+       (*count_ptr)--;
+       skb->protocol = eth_type_trans(skb, net_dev);
+ 
+-      /* IP Reassembled frames are allowed to be larger than MTU */
+-      if (unlikely(dpa_check_rx_mtu(skb, net_dev->mtu) &&
+-              !(fd_status & FM_FD_IPR))) {
+-              percpu_stats->rx_dropped++;
+-              goto drop_bad_frame;
+-      }
+-
+       skb_len = skb->len;
+ 
+ #ifdef CONFIG_FSL_DPAA_DBG_LOOP
+@@ -655,10 +648,6 @@ void __hot _dpa_rx(struct net_device *ne
+ packet_dropped:
+       return;
+ 
+-drop_bad_frame:
+-      dev_kfree_skb(skb);
+-      return;
+-
+ _release_frame:
+       dpa_fd_release(net_dev, fd);
+ }