ice: Fix undersized tx_flags variable

As not all ICE_TX_FLAGS_* fit in current 16-bit limited
tx_flags field that was introduced in the Fixes commit,
VLAN-related information would be discarded completely.
As such, creating a vlan and trying to run ping through
would result in no traffic passing.

Fix that by refactoring tx_flags variable into flags only and
a separate variable that holds VLAN ID. As there is some space left,
type variable can fit between those two. Pahole reports no size
change to ice_tx_buf struct.

Fixes: aa1d3faf71a6 ("ice: Robustify cleaning/completing XDP Tx buffers")
Signed-off-by: Jan Sokolowski <jan.sokolowski@intel.com>
Reviewed-by: Alexander Lobakin <aleksander.lobakin@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/intel/ice/ice_dcb_lib.c b/drivers/net/ethernet/intel/ice/ice_dcb_lib.c
index c6d4926..850db8e 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_dcb_lib.c
+++ b/drivers/net/ethernet/intel/ice/ice_dcb_lib.c
@@ -932,10 +932,9 @@ ice_tx_prepare_vlan_flags_dcb(struct ice_tx_ring *tx_ring,
        if ((first->tx_flags & ICE_TX_FLAGS_HW_VLAN ||
             first->tx_flags & ICE_TX_FLAGS_HW_OUTER_SINGLE_VLAN) ||
            skb->priority != TC_PRIO_CONTROL) {
-               first->tx_flags &= ~ICE_TX_FLAGS_VLAN_PR_M;
+               first->vid &= ~VLAN_PRIO_MASK;
                /* Mask the lower 3 bits to set the 802.1p priority */
-               first->tx_flags |= (skb->priority & 0x7) <<
-                                  ICE_TX_FLAGS_VLAN_PR_S;
+               first->vid |= (skb->priority << VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK;
                /* if this is not already set it means a VLAN 0 + priority needs
                 * to be offloaded
                 */

diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.c b/drivers/net/ethernet/intel/ice/ice_txrx.c
index 4fcf2d0..059bd91 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_txrx.c
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.c
@@ -1664,8 +1664,7 @@ ice_tx_map(struct ice_tx_ring *tx_ring, struct ice_tx_buf *first,
 
        if (first->tx_flags & ICE_TX_FLAGS_HW_VLAN) {
                td_cmd |= (u64)ICE_TX_DESC_CMD_IL2TAG1;
-               td_tag = (first->tx_flags & ICE_TX_FLAGS_VLAN_M) >>
-                         ICE_TX_FLAGS_VLAN_S;
+               td_tag = first->vid;
        }
 
        dma = dma_map_single(tx_ring->dev, skb->data, size, DMA_TO_DEVICE);
@@ -1998,7 +1997,7 @@ ice_tx_prepare_vlan_flags(struct ice_tx_ring *tx_ring, struct ice_tx_buf *first)
         * VLAN offloads exclusively so we only care about the VLAN ID here
         */
        if (skb_vlan_tag_present(skb)) {
-               first->tx_flags |= skb_vlan_tag_get(skb) << ICE_TX_FLAGS_VLAN_S;
+               first->vid = skb_vlan_tag_get(skb);
                if (tx_ring->flags & ICE_TX_FLAGS_RING_VLAN_L2TAG2)
                        first->tx_flags |= ICE_TX_FLAGS_HW_OUTER_SINGLE_VLAN;
                else
@@ -2388,8 +2387,7 @@ ice_xmit_frame_ring(struct sk_buff *skb, struct ice_tx_ring *tx_ring)
                offload.cd_qw1 |= (u64)(ICE_TX_DESC_DTYPE_CTX |
                                        (ICE_TX_CTX_DESC_IL2TAG2 <<
                                        ICE_TXD_CTX_QW1_CMD_S));
-               offload.cd_l2tag2 = (first->tx_flags & ICE_TX_FLAGS_VLAN_M) >>
-                       ICE_TX_FLAGS_VLAN_S;
+               offload.cd_l2tag2 = first->vid;
        }
 
        /* set up TSO offload */

diff --git a/drivers/net/ethernet/intel/ice/ice_txrx.h b/drivers/net/ethernet/intel/ice/ice_txrx.h
index fff0efe..166413f 100644 (file)
--- a/drivers/net/ethernet/intel/ice/ice_txrx.h
+++ b/drivers/net/ethernet/intel/ice/ice_txrx.h
@@ -127,10 +127,6 @@ static inline int ice_skb_pad(void)
 #define ICE_TX_FLAGS_IPV6      BIT(6)
 #define ICE_TX_FLAGS_TUNNEL    BIT(7)
 #define ICE_TX_FLAGS_HW_OUTER_SINGLE_VLAN      BIT(8)
-#define ICE_TX_FLAGS_VLAN_M    0xffff0000
-#define ICE_TX_FLAGS_VLAN_PR_M 0xe0000000
-#define ICE_TX_FLAGS_VLAN_PR_S 29
-#define ICE_TX_FLAGS_VLAN_S    16
 
 #define ICE_XDP_PASS           0
 #define ICE_XDP_CONSUMED       BIT(0)
@@ -182,8 +178,9 @@ struct ice_tx_buf {
                unsigned int gso_segs;
                unsigned int nr_frags;  /* used for mbuf XDP */
        };
-       u32 type:16;                    /* &ice_tx_buf_type */
-       u32 tx_flags:16;
+       u32 tx_flags:12;
+       u32 type:4;                     /* &ice_tx_buf_type */
+       u32 vid:16;
        DEFINE_DMA_UNMAP_LEN(len);
        DEFINE_DMA_UNMAP_ADDR(dma);
 };