ice: Allow all LLDP packets from PF to Tx

[ Upstream commit f9f83202b7263ac371d616d6894a2c9ed79158ef ]

Currently in the ice driver, the check whether to
allow a LLDP packet to egress the interface from the
PF_VSI is being based on the SKB's priority field.
It checks to see if the packets priority is equal to
TC_PRIO_CONTROL.  Injected LLDP packets do not always
meet this condition.

SCAPY defaults to a sk_buff->protocol value of ETH_P_ALL
(0x0003) and does not set the priority field.  There will
be other injection methods (even ones used by end users)
that will not correctly configure the socket so that
SKB fields are correctly populated.

Then ethernet header has to have to correct value for
the protocol though.

Add a check to also allow packets whose ethhdr->h_proto
matches ETH_P_LLDP (0x88CC).

Fixes: 0c3a6101ff2d ("ice: Allow egress control packets from PF_VSI")
Signed-off-by: Dave Ertman <david.m.ertman@intel.com>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
index 33dd103035dcd4d8c5d18a9f5c5148755c7027f8..2b55efe5ed963b63d021325aeded68eda04e6ee3 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_txrx.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
@@ -2109,6 +2109,7 @@ ice_xmit_frame_ring(struct sk_buff *skb, struct ice_ring *tx_ring)
        struct ice_tx_offload_params offload = { 0 };
        struct ice_vsi *vsi = tx_ring->vsi;
        struct ice_tx_buf *first;
+       struct ethhdr *eth;
        unsigned int count;
        int tso, csum;
 
@@ -2156,7 +2157,9 @@ ice_xmit_frame_ring(struct sk_buff *skb, struct ice_ring *tx_ring)
                goto out_drop;
 
        /* allow CONTROL frames egress from main VSI if FW LLDP disabled */
-       if (unlikely(skb->priority == TC_PRIO_CONTROL &&
+       eth = (struct ethhdr *)skb_mac_header(skb);
+       if (unlikely((skb->priority == TC_PRIO_CONTROL ||
+                     eth->h_proto == htons(ETH_P_LLDP)) &&
                     vsi->type == ICE_VSI_PF &&
                     vsi->port_info->is_sw_lldp))
                offload.cd_qw1 |= (u64)(ICE_TX_DESC_DTYPE_CTX |