bna: allow transmit tagged frames

When Tx VLAN offloading is disabled frames with size ~ MTU are not
transmitted as the driver does not account 4 bytes of VLAN header added
by stack. It should use VLAN_ETH_HLEN instead of ETH_HLEN.

The second problem is with newer BNA chips (BNA 1860). These chips filter
out any VLAN tagged frames in Tx path. This is a problem when Tx VLAN
offloading is disabled and frames are tagged by stack. Older chips like
1010/1020 are not affected as they probably don't do such filtering.

Cc: Rasesh Mody <rasesh.mody@qlogic.com>
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/brocade/bna/bna_tx_rx.c

@@ -3410,7 +3410,7 @@ bna_bfi_tx_enet_start(struct bna_tx *tx)
 
 	cfg_req->tx_cfg.vlan_mode = BFI_ENET_TX_VLAN_WI;
 	cfg_req->tx_cfg.vlan_id = htons((u16)tx->txf_vlan_id);
-	cfg_req->tx_cfg.admit_tagged_frame = BNA_STATUS_T_DISABLED;
+	cfg_req->tx_cfg.admit_tagged_frame = BNA_STATUS_T_ENABLED;
 	cfg_req->tx_cfg.apply_vlan_filter = BNA_STATUS_T_DISABLED;
 
 	bfa_msgq_cmd_set(&tx->msgq_cmd, NULL, NULL,

drivers/net/ethernet/brocade/bna/bnad.c

@@ -2864,7 +2864,7 @@ bnad_txq_wi_prepare(struct bnad *bnad, struct bna_tcb *tcb,
 		txqent->hdr.wi.opcode =	htons(BNA_TXQ_WI_SEND);
 		txqent->hdr.wi.lso_mss = 0;
 
-		if (unlikely(skb->len > (bnad->netdev->mtu + ETH_HLEN))) {
+		if (unlikely(skb->len > (bnad->netdev->mtu + VLAN_ETH_HLEN))) {
 			BNAD_UPDATE_CTR(bnad, tx_skb_non_tso_too_long);
 			return -EINVAL;
 		}