bnx2x: correct reading of speed capabilities

When the bnx2x driver reads the port configuration - mask irrelevant bits.

Without this change, the unintended bits may cause the driver to needlessly
toggle the link, as a comparison in the link flap avoidance flow will show
that the old link did not advertise the same capabilities and thus cannot
be retained.
Signed-off-by: Yaniv Rosner <yanivr@broadcom.com>
Signed-off-by: Yuval Mintz <yuvalmin@broadcom.com>
Signed-off-by: Eilon Greenstein <eilong@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/broadcom/bnx2x/bnx2x_main.c

@@ -10667,10 +10667,12 @@ static void bnx2x_get_port_hwinfo(struct bnx2x *bp)
 
 	bp->link_params.speed_cap_mask[0] =
 		SHMEM_RD(bp,
-			 dev_info.port_hw_config[port].speed_capability_mask);
+			 dev_info.port_hw_config[port].speed_capability_mask) &
+		PORT_HW_CFG_SPEED_CAPABILITY_D0_MASK;
 	bp->link_params.speed_cap_mask[1] =
 		SHMEM_RD(bp,
-			 dev_info.port_hw_config[port].speed_capability_mask2);
+			 dev_info.port_hw_config[port].speed_capability_mask2) &
+		PORT_HW_CFG_SPEED_CAPABILITY_D0_MASK;
 	bp->port.link_config[0] =
 		SHMEM_RD(bp, dev_info.port_feature_config[port].link_config);