qed: Fix iWARP syn packet mac address validation.

[ Upstream commit 8be3dadf ]

The ll2 forwards all syn packets to the driver without validating the mac
address. Add validation check in the driver's iWARP listener flow and drop
the packet if it isn't intended for the device.
Signed-off-by: Ariel Elior <ariel.elior@marvell.com>
Signed-off-by: Michal Kalderon <michal.kalderon@marvell.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/net/ethernet/qlogic/qed/qed_iwarp.c

@@ -1651,6 +1651,15 @@ qed_iwarp_parse_rx_pkt(struct qed_hwfn *p_hwfn,
 
 	eth_hlen = ETH_HLEN + (vlan_valid ? sizeof(u32) : 0);
 
+	if (!ether_addr_equal(ethh->h_dest,
+			      p_hwfn->p_rdma_info->iwarp.mac_addr)) {
+		DP_VERBOSE(p_hwfn,
+			   QED_MSG_RDMA,
+			   "Got unexpected mac %pM instead of %pM\n",
+			   ethh->h_dest, p_hwfn->p_rdma_info->iwarp.mac_addr);
+		return -EINVAL;
+	}
+
 	ether_addr_copy(remote_mac_addr, ethh->h_source);
 	ether_addr_copy(local_mac_addr, ethh->h_dest);